Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
cli/ballerina-cli-module/src/main/java/org/ballerinalang/cli/module/Pull.java
### 代码内容：
// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
//
// WSO2 Inc. licenses this file to you under the Apache License,
// Version 2.0 (the "License"); you may not use this file except
// in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.ballerinalang.cli.module;

import me.tongfei.progressbar.ProgressBar;
import me.tongfei.progressbar.ProgressBarStyle;
import org.ballerinalang.cli.module.util.ErrorUtil;
import org.ballerinalang.cli.module.util.Utils;
import org.ballerinalang.jvm.JSONParser;
import org.ballerinalang.jvm.values.MapValue;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.ws.rs.core.HttpHeaders;

import static org.ballerinalang.cli.module.util.CliModuleConstants.BALLERINA_PLATFORM;
import static org.ballerinalang.cli.module.util.CliModuleConstants.BAL_LANG_SPEC_VERSION;
import static org.ballerinalang.cli.module.util.CliModuleConstants.IDENTITY;
import static org.ballerinalang.cli.module.util.CliModuleConstants.RESOLVED_REQUESTED_URI;
import static org.ballerinalang.cli.module.util.Utils.convertToUrl;
import static org.ballerinalang.cli.module.util.Utils.createHttpUrlConnection;
import static org.ballerinalang.cli.module.util.Utils.getStatusCode;
import static org.ballerinalang.cli.module.util.Utils.initializeSsl;
import static org.ballerinalang.cli.module.util.Utils.setRequestMethod;

/**
 * This class is pulling the modules from ballerina central.
 *
 * @since 1.2.0
 */
public class Pull {
    private static final String VERSION_REGEX = "(\\d+\\.)(\\d+\\.)(\\d+)";
    private static PrintStream outStream = System.out;
    private static DefaultLogFormatter logFormatter = new DefaultLogFormatter();

    private Pull() {
    }

    /**
     * Execute pull command.
     *
     * @param url                   remote uri of the central
     * @param modulePathInBaloCache module path in balo cache, user.home/.ballerina/balo_cache/org_name/module_name
     * @param moduleNameWithOrg     module name with org, org_name/module_name
     * @param proxyHost             proxy host
     * @param proxyPort             proxy port
     * @param proxyUsername         proxy username
     * @param proxyPassword         proxy password
     * @param supportedVersionRange supported version range
     * @param isBuild               pulling happens when building
     * @param isNightlyBuild        is nightly build
     * @param langSpecVersion       lang spec version
     * @param platform              supported version
     */
    public static void execute(String url, String modulePathInBaloCache, String moduleNameWithOrg, String proxyHost,
            int proxyPort, String proxyUsername, String proxyPassword, String supportedVersionRange, boolean isBuild,
            boolean isNightlyBuild, String langSpecVersion, String platform) {
        if (isBuild) {
            logFormatter = new BuildLogFormatter();
        }

        HttpURLConnection conn = null;
        try {
            initializeSsl();
            conn = createHttpUrlConnection(convertToUrl(url + supportedVersionRange), proxyHost, proxyPort,
                    proxyUsername, proxyPassword);

            conn.setInstanceFollowRedirects(false);
            setRequestMethod(conn, Utils.RequestMethod.GET);

            // Set headers
            conn.setRequestProperty(BALLERINA_PLATFORM, platform);
            conn.setRequestProperty(BAL_LANG_SPEC_VERSION, langSpecVersion);
            conn.setRequestProperty(HttpHeaders.ACCEPT_ENCODING, IDENTITY);

            boolean redirect = false;
            // 302 - Module is found
            // Other - Error occurred, json returned with the error message
            if (getStatusCode(conn) == HttpURLConnection.HTTP_MOVED_TEMP) {
                redirect = true;
            } else {
                handleErrorResponse(conn, url, moduleNameWithOrg);
            }

            if (redirect) {
                // get redirect url from "location" header field
                String newUrl = conn.getHeaderField(HttpHeaders.LOCATION);
                String contentDisposition = conn.getHeaderField(HttpHeaders.CONTENT_DISPOSITION);

                conn = createHttpUrlConnection(convertToUrl(newUrl), proxyHost, proxyPort, proxyUsername,
                        proxyPassword);
                conn.setRequestProperty(HttpHeaders.CONTENT_DISPOSITION, contentDisposition);

                createBaloInHomeRepo(conn, modulePathInBaloCache, moduleNameWithOrg, isNightlyBuild, newUrl,
                        contentDisposition);
            }
        } catch (Exception e) {
            throw ErrorUtil.createCommandException(e.getMessage());
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
            Authenticator.setDefault(null);
        }
    }

    /**
     * Create the balo in home repo.
     *
     * @param conn                  http connection
     * @param modulePathInBaloCache module path in balo cache, <user.home>.ballerina/balo_cache/<org-name>/<module-name>
     * @param moduleNameWithOrg     module name with org, <org-name>/<module-name>
     * @param isNightlyBuild        is nightly build
     * @param newUrl                new redirect url
     * @param contentDisposition    content disposition header
     */
    private static void createBaloInHomeRepo(HttpURLConnection conn, String modulePathInBaloCache,
            String moduleNameWithOrg, boolean isNightlyBuild, String newUrl, String contentDisposition) {
        long responseContentLength = conn.getContentLengthLong();
        if (responseContentLength <= 0) {
            createError("invalid response from the server, please try again");
        }
        String resolvedURI = conn.getHeaderField(RESOLVED_REQUESTED_URI);
        if (resolvedURI == null || resolvedURI.equals("")) {
            resolvedURI = newUrl;
        }
        String[] uriParts = resolvedURI.split("/");
        String moduleVersion = uriParts[uriParts.length - 3];

        validateModuleVersion(moduleVersion);
        String baloFile = getBaloFileName(contentDisposition, uriParts[uriParts.length - 1]);
        Path baloCacheWithModulePath = Paths.get(modulePathInBaloCache, moduleVersion);
        //<user.home>.ballerina/balo_cache/<org-name>/<module-name>/<module-version>

        Path baloPath = Paths.get(baloCacheWithModulePath.toString(), baloFile);
        if (baloPath.toFile().exists()) {
            createError("module already exists in the home repository: " + baloPath.toString());
        }

        createBaloFileDirectory(baloCacheWithModulePath);
        writeBaloFile(conn, baloPath, moduleNameWithOrg + ":" + moduleVersion, responseContentLength);
        handleNightlyBuild(isNightlyBuild, baloCacheWithModulePath);
    }

    /**
     * Write balo file to the home repo.
     *
     * @param conn             http connection
     * @param baloPath         path of the balo file
     * @param fullModuleName   full module name, <org-name>/<module-name>:<module-version>
     * @param resContentLength response content length
     */
    private static void writeBaloFile(HttpURLConnection conn, Path baloPath, String fullModuleName,
            long resContentLength) {
        try (InputStream inputStream = conn.getInputStream();
                FileOutputStream outputStream = new FileOutputStream(baloPath.toString())) {
            writeAndHandleProgress(inputStream, outputStream, resContentLength / 1024, fullModuleName);
        } catch (IOException e) {
            createError("error occurred copying the balo file: " + e.getMessage());
        }
    }

    /**
     * Show progress of the writing the balo file.
     *
     * @param inputStream    response input stream
     * @param outputStream   home repo balo file output stream
     * @param totalSizeInKB  response input stream size in kb
     * @param fullModuleName full module name, <org-name>/<module-name>:<module-version>
     */
    private static void writeAndHandleProgress(InputStream inputStream, FileOutputStream outputStream,
            long totalSizeInKB, String fullModuleName) {
        int count;
        byte[] buffer = new byte[1024];

        try (ProgressBar progressBar = new ProgressBar(fullModuleName + " [central.ballerina.io -> home repo] ",
                totalSizeInKB, 1000, outStream, ProgressBarStyle.ASCII, " KB", 1)) {
            while ((count = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, count);
                progressBar.step();
            }
        } catch (IOException e) {
            outStream.println(logFormatter.formatLog(fullModuleName + "pulling the module from central failed"));
        } finally {
            outStream.println(logFormatter.formatLog(fullModuleName + " pulled from central successfully"));
        }
    }

    /**
     * Handle nightly build.
     *
     * @param isNightlyBuild          is nightly build
     * @param baloCacheWithModulePath balo cache with module path
     */
    private static void handleNightlyBuild(boolean isNightlyBuild, Path baloCacheWithModulePath) {
        if (isNightlyBuild) {
            // If its a nightly build tag the file as a module from nightly
            Path nightlyBuildMetaFile = Paths.get(baloCacheWithModulePath.toString(), "nightly.build");
            if (!nightlyBuildMetaFile.toFile().exists()) {
                createNightlyBuildMetaFile(nightlyBuildMetaFile);
            }
        }
    }

    /**
     * Validate module version with the regex.
     *
     * @param moduleVersion module version
     */
    private static void validateModuleVersion(String moduleVersion) {
        if (!moduleVersion.matches(VERSION_REGEX)) {
            createError("module version could not be detected");
        }
    }

    /**
     * Create nightly build meta file.
     *
     * @param nightlyBuildMetaFilePath nightly build meta file path
     */
    private static void createNightlyBuildMetaFile(Path nightlyBuildMetaFilePath) {
        try {
            Files.createFile(nightlyBuildMetaFilePath);
        } catch (Exception e) {
            createError("error occurred while creating nightly.build file.");
        }
    }

    /**
     * Create balo file directory.
     *
     * @param fullPathToStoreBalo full path to store the balo file
     *                            <user.home>.ballerina/balo_cache/<org-name>/<module-name>/<module-version>
     */
    private static void createBaloFileDirectory(Path fullPathToStoreBalo) {
        try {
            Files.createDirectory(fullPathToStoreBalo);
        } catch (IOException e) {
            createError("error creating directory for balo file");
        }
    }

    /**
     * Handle error response.
     *
     * @param conn           http connection
     * @param url            remote repository url
     * @param moduleFullName module name with org and version
     */
    private static void handleErrorResponse(HttpURLConnection conn, String url, String moduleFullName) {
        try (BufferedReader reader = new BufferedReader(
                new InputStreamReader(conn.getErrorStream(), Charset.defaultCharset()))) {
            StringBuilder result = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                result.append(line);
            }

            MapValue payload = (MapValue) JSONParser.parse(result.toString());
            createError("error: " + payload.getStringValue("message"));
        } catch (IOException e) {
            createError("failed to pull the module '" + moduleFullName + "' from the remote repository '" + url + "'");
        }
    }

    /**
     * Create error using log formatter.
     *
     * @param errMessage error message
     */
    private static void createError(String errMessage) {
        throw ErrorUtil.createCommandException(logFormatter.formatLog(errMessage));
    }

    /**
     * Get balo file name from content disposition header.
     *
     * @param contentDisposition content disposition header value
     * @param baloFile           balo file name taken from RESOLVED_REQUESTED_URI
     * @return balo file name
     */
    private static String getBaloFileName(String contentDisposition, String baloFile) {
        if (contentDisposition != null && !contentDisposition.equals("")) {
            return contentDisposition.substring("attachment; filename=".length());
        } else {
            return baloFile;
        }
    }
}

/**
 * Default log formatter class.
 */
class DefaultLogFormatter {
    String formatLog(String msg) {
        return msg;
    }
}

/**
 * Build log formatter class which used to log the message for build command.
 */
class BuildLogFormatter extends DefaultLogFormatter {
    @Override String formatLog(String msg) {
        return "\t" + msg;
    }
}

## 内容2
### 文件路径：
cli/ballerina-cli-module/src/main/java/org/ballerinalang/cli/module/Push.java
### 代码内容：
// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
//
// WSO2 Inc. licenses this file to you under the Apache License,
// Version 2.0 (the "License"); you may not use this file except
// in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.ballerinalang.cli.module;

import me.tongfei.progressbar.ProgressBar;
import me.tongfei.progressbar.ProgressBarStyle;
import org.ballerinalang.cli.module.util.ErrorUtil;
import org.ballerinalang.cli.module.util.Utils;
import org.ballerinalang.jvm.JSONParser;
import org.ballerinalang.jvm.values.MapValue;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;

import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;

import static org.ballerinalang.cli.module.util.CliModuleConstants.PUSH_ORGANIZATION;
import static org.ballerinalang.cli.module.util.Utils.convertToUrl;
import static org.ballerinalang.cli.module.util.Utils.createHttpUrlConnection;
import static org.ballerinalang.cli.module.util.Utils.getStatusCode;
import static org.ballerinalang.cli.module.util.Utils.initializeSsl;
import static org.ballerinalang.cli.module.util.Utils.setRequestMethod;

/**
 * This class is pushing the modules to ballerina central.
 *
 * @since 1.2.0
 */
public class Push {

    private static PrintStream errStream = System.err;
    private static PrintStream outStream = System.out;
    private static final int NO_OF_BYTES = 64;
    private static final int BUFFER_SIZE = 1024 * NO_OF_BYTES;

    private Push() {
    }

    /**
     * Execute push command.
     *
     * @param url           remote uri of the central
     * @param proxyHost     proxy host
     * @param proxyPort     proxy port
     * @param proxyUsername proxy username
     * @param proxyPassword proxy password
     * @param accessToken   access token of the org
     * @param orgName       org name
     * @param moduleName    module name
     * @param version       module version
     * @param baloPath      path to the balo
     */
    public static void execute(String url, String proxyHost, int proxyPort, String proxyUsername, String proxyPassword,
            String accessToken, String orgName, String moduleName, String version, Path baloPath) {
        initializeSsl();
        HttpURLConnection conn = createHttpUrlConnection(convertToUrl(url), proxyHost, proxyPort, proxyUsername,
                proxyPassword);
        conn.setInstanceFollowRedirects(false);
        setRequestMethod(conn, Utils.RequestMethod.POST);

        // Set headers
        conn.setRequestProperty(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);
        conn.setRequestProperty(PUSH_ORGANIZATION, orgName);
        conn.setRequestProperty(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_OCTET_STREAM);

        conn.setDoOutput(true);
        conn.setChunkedStreamingMode(BUFFER_SIZE);

        try (DataOutputStream outputStream = new DataOutputStream(conn.getOutputStream())) {
            // Send balo content by 1 kb chunks
            byte[] buffer = new byte[BUFFER_SIZE];
            int count;
            try (ProgressBar progressBar = new ProgressBar(
                    orgName + "/" + moduleName + ":" + version + " [project repo -> central]",
                    getTotalFileSizeInKB(baloPath), 1000, outStream, ProgressBarStyle.ASCII, " KB", 1);
                    FileInputStream fis = new FileInputStream(baloPath.toFile())) {
                while ((count = fis.read(buffer)) > 0) {
                    outputStream.write(buffer, 0, count);
                    outputStream.flush();
                    progressBar.stepBy((long) NO_OF_BYTES);
                }
            }
        } catch (IOException e) {
            throw ErrorUtil.createCommandException("error occurred while uploading balo to central: " + e.getMessage());
        }

        handleResponse(conn, orgName, moduleName, version);
        Authenticator.setDefault(null);
    }

    /**
     * Handle the http response.
     *
     * @param conn       http connection
     * @param orgName    org name
     * @param moduleName module name
     * @param version    module version
     */
    private static void handleResponse(HttpURLConnection conn, String orgName, String moduleName, String version) {
        try {
            int statusCode = getStatusCode(conn);
            // 200 - Module pushed successfully
            // Other - Error occurred, json returned with the error message
            if (statusCode == HttpURLConnection.HTTP_OK) {
                outStream.println(orgName + "/" + moduleName + ":" + version + " pushed to central successfully");
            } else if (statusCode == HttpURLConnection.HTTP_UNAUTHORIZED) {
                errStream.println("unauthorized access token for organization: " + orgName);
            } else if (statusCode == HttpURLConnection.HTTP_BAD_REQUEST) {
                try (BufferedReader reader = new BufferedReader(
                        new InputStreamReader(conn.getErrorStream(), Charset.defaultCharset()))) {
                    StringBuilder result = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        result.append(line);
                    }

                    MapValue payload = (MapValue) JSONParser.parse(result.toString());
                    String message = payload.getStringValue("message");
                    if (message.contains("module md file cannot be empty")) {
                        errStream.println(message);
                    } else {
                        throw ErrorUtil.createCommandException(message);
                    }
                } catch (IOException e) {
                    throw ErrorUtil.createCommandException(
                            "failed to push the module '" + orgName + "/" + moduleName + ":" + version
                                    + "' to the remote repository '" + conn.getURL() + "'");
                }
            } else {
                throw ErrorUtil.createCommandException(
                        "failed to push the module '" + orgName + "/" + moduleName + ":" + version
                                + "' to the remote repository '" + conn.getURL() + "'");
            }
        } finally {
            conn.disconnect();
        }
    }

    /**
     * Get total file size in kb.
     *
     * @param filePath path to the file
     * @return size of the file in kb
     */
    private static long getTotalFileSizeInKB(Path filePath) {
        byte[] baloContent;
        try {
            baloContent = Files.readAllBytes(filePath);
            return baloContent.length / 1024;
        } catch (IOException e) {
            throw ErrorUtil.createCommandException("cannot read the balo content");
        }
    }
}

## 内容3
### 文件路径：
cli/ballerina-cli-module/src/main/java/org/ballerinalang/cli/module/Search.java
### 代码内容：
// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
//
// WSO2 Inc. licenses this file to you under the Apache License,
// Version 2.0 (the "License"); you may not use this file except
// in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.ballerinalang.cli.module;

import org.ballerinalang.cli.module.util.ErrorUtil;
import org.ballerinalang.cli.module.util.Utils;
import org.ballerinalang.jvm.JSONParser;
import org.ballerinalang.jvm.values.ArrayValue;
import org.ballerinalang.jvm.values.MapValue;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.nio.charset.Charset;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import static org.ballerinalang.cli.module.util.Utils.convertToUrl;
import static org.ballerinalang.cli.module.util.Utils.createHttpUrlConnection;
import static org.ballerinalang.cli.module.util.Utils.getStatusCode;
import static org.ballerinalang.cli.module.util.Utils.initializeSsl;
import static org.ballerinalang.cli.module.util.Utils.setRequestMethod;

/**
 * This class is searching modules from ballerina central.
 *
 * @since 1.2.0
 */
public class Search {

    private static PrintStream outStream = System.out;

    private Search() {
    }

    /**
     * Execute search command.
     *
     * @param url           remote uri of the central
     * @param proxyHost     proxy host
     * @param proxyPort     proxy port
     * @param proxyUsername proxy username
     * @param proxyPassword proxy password
     * @param terminalWidth terminal width of the CLI
     */
    public static void execute(String url, String proxyHost, int proxyPort, String proxyUsername, String proxyPassword,
            String terminalWidth) {
        initializeSsl();
        HttpURLConnection conn = createHttpUrlConnection(convertToUrl(url), proxyHost, proxyPort, proxyUsername,
                proxyPassword);
        conn.setInstanceFollowRedirects(false);
        setRequestMethod(conn, Utils.RequestMethod.GET);
        handleResponse(conn, getStatusCode(conn), terminalWidth);
        Authenticator.setDefault(null);
    }

    /**
     * Handle http response.
     *
     * @param conn          http connection
     * @param statusCode    status code of the response
     * @param terminalWidth terminal width of the CLI
     */
    private static void handleResponse(HttpURLConnection conn, int statusCode, String terminalWidth) {
        try {
            // 200 - modules found
            // Other - Error occurred, json returned with the error message
            MapValue payload;
            if (statusCode == HttpURLConnection.HTTP_OK) {
                try (BufferedReader reader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream(), Charset.defaultCharset()))) {
                    StringBuilder result = new StringBuilder();
                    String line;
                    while ((line = reader.readLine()) != null) {
                        result.append(line);
                    }
                    payload = (MapValue) JSONParser.parse(result.toString());
                } catch (IOException e) {
                    throw ErrorUtil.createCommandException(e.getMessage());
                }

                if (payload.getIntValue("count") > 0) {
                    ArrayValue modules = payload.getArrayValue("modules");
                    printModules(modules, terminalWidth);
                } else {
                    outStream.println("no modules found");
                }
            } else {
                StringBuilder result = new StringBuilder();
                try (BufferedReader reader = new BufferedReader(
                        new InputStreamReader(conn.getErrorStream(), Charset.defaultCharset()))) {
                    String line;
                    while ((line = reader.readLine()) != null) {
                        result.append(line);
                    }
                } catch (IOException e) {
                    throw ErrorUtil.createCommandException(e.getMessage());
                }

                payload = (MapValue) JSONParser.parse(result.toString());
                throw ErrorUtil.createCommandException(payload.getStringValue("message"));
            }
        } finally {
            conn.disconnect();
        }
    }

    /**
     * Print module information as a table in the CLI.
     *
     * @param modules       modules array
     * @param terminalWidth terminal width of the CLI
     */
    public static void printModules(ArrayValue modules, String terminalWidth) {
        int rightMargin = 3;
        int width = Integer.parseInt(terminalWidth) - rightMargin;
        int dateColWidth = 15;
        int versionColWidth = 8;
        int authorsColWidth = 15;
        double nameColFactor = 9.0;
        double descColFactor = 16.0;
        int additionalSpace = 7;
        double remainingWidth = (double) width - (dateColWidth + versionColWidth + additionalSpace);
        int nameColWidth = (int) Math.round(remainingWidth * (nameColFactor / (nameColFactor + descColFactor)));
        int descColWidth = (int) Math.round(remainingWidth * (descColFactor / (nameColFactor + descColFactor)));
        int minDescColWidth = 60;

        printTitle();
        printTableHeader(dateColWidth, versionColWidth, nameColWidth, descColWidth, minDescColWidth, authorsColWidth);

        int i = 0;
        while (i < modules.size()) {
            printModule((MapValue) modules.get(i), dateColWidth, versionColWidth, authorsColWidth, nameColWidth,
                    descColWidth, minDescColWidth);
            i = i + 1;
            outStream.println();
        }
        outStream.println();
        outStream.println(modules.size() + " modules found");
    }

    /**
     * Print module row.
     *
     * @param module          module information
     * @param dateColWidth    date column width
     * @param versionColWidth version column width
     * @param nameColWidth    name column width
     * @param descColWidth    description column width
     * @param minDescColWidth minimum description column width
     * @param authorsColWidth authors column width
     */
    private static void printModule(MapValue module, int dateColWidth, int versionColWidth, int authorsColWidth,
            int nameColWidth, int descColWidth, int minDescColWidth) {
        String orgName = module.getStringValue("orgName");
        String packageName = module.getStringValue("name");
        printInCLI("|" + orgName + "/" + packageName, nameColWidth);

        String summary = module.getStringValue("summary");

        if (descColWidth >= minDescColWidth) {
            printInCLI(summary, descColWidth - authorsColWidth);
            String authors = "";
            ArrayValue authorsArr = module.getArrayValue("authors");

            if (authorsArr.size() > 0) {
                for (int j = 0; j < authorsArr.size(); j++) {
                    if (j == 0) {
                        authors = (String) authorsArr.get(j);
                    } else if (j == authorsArr.size() - 1) {
                        authors = (String) authorsArr.get(j);
                    } else {
                        authors = ", " + authorsArr.get(j);
                    }
                }
            }
            printInCLI(authors, authorsColWidth);
        } else {
            printInCLI(summary, descColWidth);
        }

        long createTimeJson = module.getIntValue("createdDate");
        printInCLI(getDateCreated(createTimeJson), dateColWidth);

        String packageVersion = module.getStringValue("version");
        printInCLI(packageVersion, versionColWidth);
    }

    /**
     * Print the tile.
     */
    private static void printTitle() {
        outStream.println();
        outStream.println("Ballerina Central");
        outStream.println("=================");
        outStream.println();
    }

    /**
     * Print in CLI.
     *
     * @param element           printing element
     * @param charactersAllowed number of characters allowed
     */
    private static void printInCLI(String element, int charactersAllowed) {
        int lengthOfElement = element.length();
        if (lengthOfElement > charactersAllowed || lengthOfElement == charactersAllowed) {
            int margin = 3;
            String trimmedElement = element.substring(0, charactersAllowed - margin) + "...";
            outStream.print(trimmedElement + " |");
        } else {
            printCharacter(element, charactersAllowed, " ", false);
        }
    }

    /**
     * Print characters.
     *
     * @param element           printing element
     * @param charactersAllowed number of characters allowed
     * @param separator         separating element
     * @param isDashElement     is a dash element
     */
    private static void printCharacter(String element, int charactersAllowed, String separator, boolean isDashElement) {
        int lengthOfElement = element.length();
        StringBuilder print = new StringBuilder(element);
        int i = 0;
        while (i < charactersAllowed - lengthOfElement) {
            print.append(separator);
            i = i + 1;
        }
        if (isDashElement) {
            outStream.print(print + "-|");
        } else {
            outStream.print(print + " |");
        }
    }

    /**
     * Get date in simple date format.
     *
     * @param timeInMillis date in millis
     * @return date in simple date format
     */
    private static String getDateCreated(long timeInMillis) {
        Date date = new Date(timeInMillis);
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd-E");
        return df.format(date);
    }

    /**
     * Print table header.
     *
     * @param dateColWidth    date column width
     * @param versionColWidth version column width
     * @param nameColWidth    name column width
     * @param descColWidth    description column width
     * @param minDescColWidth minimum description column width
     * @param authorsColWidth authors column width
     */
    private static void printTableHeader(int dateColWidth, int versionColWidth, int nameColWidth, int descColWidth,
            int minDescColWidth, int authorsColWidth) {
        printHeadingRow(dateColWidth, versionColWidth, nameColWidth, descColWidth, minDescColWidth, authorsColWidth);
        printDashRow(dateColWidth, versionColWidth, nameColWidth, descColWidth, minDescColWidth, authorsColWidth);
    }

    /**
     * Print heading row of the table header.
     *
     * @param dateColWidth    date column width
     * @param versionColWidth version column width
     * @param nameColWidth    name column width
     * @param descColWidth    description column width
     * @param minDescColWidth minimum description column width
     * @param authorsColWidth authors column width
     */
    private static void printHeadingRow(int dateColWidth, int versionColWidth, int nameColWidth, int descColWidth,
            int minDescColWidth, int authorsColWidth) {
        printInCLI("|NAME", nameColWidth);
        if (descColWidth >= minDescColWidth) {
            printInCLI("DESCRIPTION", descColWidth - authorsColWidth);
            printInCLI("AUTHOR", authorsColWidth);
        } else {
            printInCLI("DESCRIPTION", descColWidth);
        }
        printInCLI("DATE", dateColWidth);
        printInCLI("VERSION", versionColWidth);
        outStream.println();
    }

    /**
     * Print dash row of the table header.
     *
     * @param dateColWidth    date column width
     * @param versionColWidth version column width
     * @param nameColWidth    name column width
     * @param descColWidth    description column width
     * @param minDescColWidth minimum description column width
     * @param authorsColWidth authors column width
     */
    private static void printDashRow(int dateColWidth, int versionColWidth, int nameColWidth, int descColWidth,
            int minDescColWidth, int authorsColWidth) {
        printCharacter("|-", nameColWidth, "-", true);

        if (descColWidth >= minDescColWidth) {
            printCharacter("-", descColWidth - authorsColWidth, "-", true);
            printCharacter("-", authorsColWidth, "-", true);
        } else {
            printCharacter("-", descColWidth, "-", true);
        }

        printCharacter("-", dateColWidth, "-", true);
        printCharacter("-", versionColWidth, "-", true);

        outStream.println();
    }
}

## 内容4
### 文件路径：
cli/ballerina-cli-module/src/main/java/org/ballerinalang/cli/module/TokenUpdater.java
### 代码内容：
// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
//
// WSO2 Inc. licenses this file to you under the Apache License,
// Version 2.0 (the "License"); you may not use this file except
// in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.ballerinalang.cli.module;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import org.ballerinalang.cli.module.util.ErrorUtil;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;
import java.util.Collections;

import javax.ws.rs.core.HttpHeaders;

import static org.ballerinalang.cli.module.util.CliModuleConstants.SETTINGS_TOML_FILE;

/**
 * This class has a service which updates the access token in the `Settings.toml` file.
 *
 * @since 1.2.0
 */
public class TokenUpdater {

    private static PrintStream errStream = System.err;
    private static PrintStream outStream = System.out;

    private TokenUpdater() {
    }

    /**
     * Creating the server which updates the access token in the `Settings.toml` file.
     *
     * @param settingsTomlFilePath `Settings.toml` file path
     */
    public static void execute(String settingsTomlFilePath) {
        HttpServer server;
        try {
            server = HttpServer.create(new InetSocketAddress(9295), 0);
        } catch (IOException e) {
            throw ErrorUtil.createCommandException("error occurred while creating the server: " + e.getMessage() +
                    "Access token is missing in " + settingsTomlFilePath +
                    "\nAuto update failed. Please visit https://central.ballerina.io, get token and add it to the" +
                    settingsTomlFilePath + " file.");
        }
        server.createContext("/update-settings", new TokenUpdateHandler());
        server.setExecutor(null); // creates a default executor
        server.start();
    }

    /**
     * Http handler of the server.
     */
    static class TokenUpdateHandler implements HttpHandler {

        @Override public void handle(HttpExchange httpExchange) {
            String token = getToken(httpExchange.getRequestURI().getPath());
            String currentUsersHomeDir = System.getProperty("user.home");
            String settingsTomlPath = String.valueOf(Paths.get(currentUsersHomeDir, ".ballerina", SETTINGS_TOML_FILE));
            FileOutputStream outputStream = null;
            try {
                outputStream = new FileOutputStream(settingsTomlPath);
                String str = "[central]\naccesstoken=\"" + token + "\"";
                outputStream.write(str.getBytes(StandardCharsets.UTF_8));
            } catch (FileNotFoundException e) {
                throw ErrorUtil.createCommandException("Settings.toml file could not be found: " + settingsTomlPath);
            } catch (IOException e) {
                throw ErrorUtil.createCommandException(
                        "error occurred while writing to the Settings.toml file: " + e.getMessage());
            } finally {
                try {
                    if (outputStream != null) {
                        outputStream.close();
                    }
                } catch (IOException e) {
                    errStream.println("error occurred while closing the output stream: " + e.getMessage());
                }
            }
            outStream.println("token updated");

            OutputStream os = null;
            try {
                String response = "<svg xmlns=\"http://www.w3.org/2000/svg\"/>";
                httpExchange.getResponseHeaders()
                        .put(HttpHeaders.CONTENT_TYPE, Collections.singletonList("image/svg+xml"));
                httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK,
                        response.getBytes(StandardCharsets.UTF_8).length);
                os = httpExchange.getResponseBody();
                os.write(response.getBytes(StandardCharsets.UTF_8));
            } catch (IOException e) {
                throw ErrorUtil
                        .createCommandException("error occurred while generating the response: " + e.getMessage());
            } finally {
                try {
                    if (os != null) {
                        os.close();
                    }
                } catch (IOException e) {
                    errStream.println("error occurred while closing the output stream: " + e.getMessage());
                }
            }
        }

        /**
         * Get access token from url.
         *
         * @param uri url with access token
         * @return access token
         */
        private static String getToken(String uri) {
            String[] uriParts = uri.split("/");
            return uriParts[uriParts.length - 1];
        }
    }
}

## 内容5
### 文件路径：
cli/ballerina-cli-module/src/main/java/org/ballerinalang/cli/module/util/Utils.java
### 代码内容：
// Copyright (c) 2020 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
//
// WSO2 Inc. licenses this file to you under the Apache License,
// Version 2.0 (the "License"); you may not use this file except
// in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.ballerinalang.cli.module.util;

import java.io.IOException;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.ProtocolException;
import java.net.Proxy;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import static org.ballerinalang.cli.module.util.CliModuleConstants.SSL;

/**
 * Class contains miscellaneous utility methods.
 *
 * @since 1.2.0
 */
public class Utils {

    /**
     * Request method types.
     */
    public enum RequestMethod {
        GET, POST
    }

    private static TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return new java.security.cert.X509Certificate[] {};
        }

        public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
            //No need to implement.
        }

        public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
            //No need to implement.
        }
    } };

    /**
     * Get proxy for http connection.
     *
     * @param proxyHost     proxy host
     * @param proxyPort     proxy port
     * @param proxyUsername proxy username
     * @param proxyPassword proxy password
     * @return The proxy object.
     */
    public static Proxy getProxy(String proxyHost, int proxyPort, String proxyUsername, String proxyPassword) {
        if (!"".equals(proxyHost)) {
            InetSocketAddress proxyInet = new InetSocketAddress(proxyHost, proxyPort);
            if (!"".equals(proxyUsername) && "".equals(proxyPassword)) {
                Authenticator authenticator = new Authenticator() {
                    @Override public PasswordAuthentication getPasswordAuthentication() {
                        return (new PasswordAuthentication(proxyUsername, proxyPassword.toCharArray()));
                    }
                };
                Authenticator.setDefault(authenticator);
            }
            return new Proxy(Proxy.Type.HTTP, proxyInet);
        }
        return null;
    }

    /**
     * Convert string to URL.
     *
     * @param url string URL
     * @return URL
     */
    public static URL convertToUrl(String url) {
        try {
            return new URL(url);
        } catch (MalformedURLException e) {
            throw ErrorUtil.createCommandException(e.getMessage());
        }
    }

    /**
     * Initialize SSL.
     */
    public static void initializeSsl() {
        try {
            SSLContext sc = SSLContext.getInstance(SSL);
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (NoSuchAlgorithmException | KeyManagementException e) {
            throw ErrorUtil.createCommandException("initializing SSL failed: " + e.getMessage());
        }
    }

    /**
     * Create http URL connection.
     *
     * @param url           connection URL
     * @param proxyHost     proxy host
     * @param proxyPort     proxy port
     * @param proxyUsername proxy username
     * @param proxyPassword proxy password
     * @return http URL connection
     */
    public static HttpURLConnection createHttpUrlConnection(URL url, String proxyHost, int proxyPort,
            String proxyUsername, String proxyPassword) {
        try {
            Proxy proxy = getProxy(proxyHost, proxyPort, proxyUsername, proxyPassword);
            // set proxy if exists.
            if (proxy == null) {
                return (HttpURLConnection) url.openConnection();
            } else {
                return (HttpURLConnection) url.openConnection(proxy);
            }
        } catch (IOException e) {
            throw ErrorUtil.createCommandException(e.getMessage());
        }
    }

    /**
     * Set request method of the http connection.
     *
     * @param conn   http connection
     * @param method request method
     */
    public static void setRequestMethod(HttpURLConnection conn, RequestMethod method) {
        try {
            conn.setRequestMethod(getRequestMethodAsString(method));
        } catch (ProtocolException e) {
            throw ErrorUtil.createCommandException(e.getMessage());
        }
    }

    private static String getRequestMethodAsString(RequestMethod method) {
        switch (method) {
        case GET:
            return "GET";
        case POST:
            return "POST";
        default:
            throw ErrorUtil.createCommandException("invalid request method:" + method);
        }
    }

    /**
     * Get status code of http response.
     *
     * @param conn http connection
     * @return status code
     */
    public static int getStatusCode(HttpURLConnection conn) {
        try {
            return conn.getResponseCode();
        } catch (IOException e) {
            throw ErrorUtil
                    .createCommandException("connection to the remote repository host failed: " + e.getMessage());
        }
    }
}

## 内容6
### 文件路径：
compiler/ballerina-lang/src/main/java/org/wso2/ballerinalang/compiler/packaging/converters/URIDryConverter.java
### 代码内容：
package org.wso2.ballerinalang.compiler.packaging.converters;

import org.ballerinalang.jvm.JSONParser;
import org.ballerinalang.jvm.values.MapValue;
import org.ballerinalang.model.elements.PackageID;
import org.ballerinalang.repository.CompilerInput;
import org.ballerinalang.toml.model.Manifest;
import org.wso2.ballerinalang.compiler.util.Name;
import org.wso2.ballerinalang.util.TomlParserUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.URI;
import java.nio.charset.Charset;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

/**
 *  Checks if there is a latest version in central if version is not mentioned. If there is then the version of the
 *  module is updated with that version.
 */
public class URIDryConverter extends URIConverter {

    /**
     * This is to keep track that an error has already been logged so that it doesn't repeatedly log the same error.
     */
    private static boolean loggedError = false;
    private static final Pattern semVerPatchPattern = Pattern.compile("(\\d+)\\.(\\d+)");
    private PrintStream errStream = System.err;
    private Proxy proxy;

    private static TrustManager[] trustAllCerts = new TrustManager[]{
            new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return new java.security.cert.X509Certificate[]{};
                }
                public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                    //No need to implement.
                }
                public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                    //No need to implement.
                }
            }
    };

    public URIDryConverter(URI base, Map<PackageID, Manifest> dependencyManifests) {
        this(base, dependencyManifests, false);
    }

    public URIDryConverter(URI base, Map<PackageID, Manifest> dependencyManifests, boolean isBuild) {
        super(base, dependencyManifests, isBuild);
        this.base = URI.create(base.toString() + "/modules/info/");
        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
            proxy = getProxy();
        } catch (NoSuchAlgorithmException | KeyManagementException e) {
            // ignore errors
        }
    }

    public Stream<CompilerInput> finalize(URI remoteURI, PackageID moduleID) {
        try {
            // only continue if a fixed module version is not set. a module version may be set through Ballerina.toml or
            // Ballerina.lock already.
            Matcher matcher = semVerPatchPattern.matcher(moduleID.version.value);
            if ("".equals(moduleID.version.value) || "*".equals(moduleID.version.value) || matcher.matches()) {
                HttpURLConnection conn;
                // set proxy if exists.
                if (null == this.proxy) {
                    conn = (HttpURLConnection) remoteURI.toURL().openConnection();
                } else {
                    conn = (HttpURLConnection) remoteURI.toURL().openConnection(this.proxy);
                }
                conn.setInstanceFollowRedirects(false);
                conn.setRequestMethod("GET");

                // status code and meaning
                //// 200 - module info found
                //// 400 - bad request sent
                //// 500 - backend is broken
                int statusCode = conn.getResponseCode();
                if (statusCode == 200) {
                    try (BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),
                            Charset.defaultCharset()))) {
                        StringBuilder result = new StringBuilder();
                        String line;
                        while ((line = reader.readLine()) != null) {
                            result.append(line);
                        }
                        Object payload = JSONParser.parse(result.toString());
                        if (payload instanceof MapValue) {
                            MapValue moduleInfo = ((MapValue) payload).getMapValue("module");
                            String version = moduleInfo.getStringValue("version");
                            moduleID.version = new Name(version);
                        }
                    }
                } else if (statusCode == 400 && !loggedError) {
                    try (BufferedReader errorStream = new BufferedReader(
                            new InputStreamReader(conn.getInputStream(), Charset.defaultCharset()))) {
                        String errorContent = errorStream.lines().collect(Collectors.joining("\n"));
                        this.errStream.println("error: could not connect to remote repository to find the latest " +
                                "version of module: " + moduleID.toString() + ". use '--offline' " +
                                "flag to build in offline mode. reason: " + errorContent);
                        setErrorLoggedStatusAsTrue();
                    }
                } else if (statusCode == 500 && !loggedError) {
                    this.errStream.println("error: could not connect to remote repository to find the latest " +
                            "version of module: " + moduleID.toString() + ". use '--offline' " +
                            "flag to build in offline mode.");
                    setErrorLoggedStatusAsTrue();
                }
                conn.disconnect();
                Authenticator.setDefault(null);
            }
        } catch (IOException e) {
            // ignore error and don't set the version.
        }

        return Stream.empty();
    }

    /**
     * Set the status that an error has been logged.
     */
    private static void setErrorLoggedStatusAsTrue() {
        loggedError = true;
    }

    /**
     * Get proxy for http connection.
     *
     * @return The proxy object.
     */
    private Proxy getProxy() {
        org.ballerinalang.toml.model.Proxy proxy = TomlParserUtils.readSettings().getProxy();
        if (!"".equals(proxy.getHost())) {
            InetSocketAddress proxyInet = new InetSocketAddress(proxy.getHost(), proxy.getPort());
            if (!"".equals(proxy.getUserName()) && "".equals(proxy.getPassword())) {
                Authenticator authenticator = new RemoteAuthenticator();
                Authenticator.setDefault(authenticator);
            }
            return new Proxy(Proxy.Type.HTTP, proxyInet);
        }

        return null;
    }

    /**
     * Authenticator for the proxy server if provided.
     */
    static class RemoteAuthenticator extends Authenticator {
        org.ballerinalang.toml.model.Proxy proxy;
        public RemoteAuthenticator() {
            proxy = TomlParserUtils.readSettings().getProxy();
        }

        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return (new PasswordAuthentication(this.proxy.getUserName(), this.proxy.getPassword().toCharArray()));
        }
    }
}

## 内容7
### 文件路径：
misc/openapi-ballerina/modules/openapi-to-ballerina-generator/src/main/java/org/ballerinalang/openapi/CodeGenerator.java
### 代码内容：
package org.ballerinalang.openapi;

import com.github.jknack.handlebars.Context;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;
import com.github.jknack.handlebars.context.FieldValueResolver;
import com.github.jknack.handlebars.context.JavaBeanValueResolver;
import com.github.jknack.handlebars.context.MapValueResolver;
import com.github.jknack.handlebars.helper.StringHelpers;
import com.github.jknack.handlebars.io.ClassPathTemplateLoader;
import com.github.jknack.handlebars.io.FileTemplateLoader;
import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.parser.OpenAPIV3Parser;
import org.apache.commons.lang3.StringUtils;
import org.ballerinalang.openapi.exception.BallerinaOpenApiException;
import org.ballerinalang.openapi.model.BallerinaOpenApi;
import org.ballerinalang.openapi.model.GenSrcFile;
import org.ballerinalang.openapi.typemodel.BallerinaOpenApiType;
import org.ballerinalang.openapi.utils.CodegenUtils;
import org.ballerinalang.openapi.utils.GeneratorConstants;
import org.ballerinalang.openapi.utils.GeneratorConstants.GenType;
import org.ballerinalang.openapi.utils.TypeExtractorUtil;
import org.ballerinalang.tool.LauncherUtils;
import org.wso2.ballerinalang.compiler.util.ProjectDirs;

import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static org.ballerinalang.openapi.model.GenSrcFile.GenFileType;
import static org.ballerinalang.openapi.utils.GeneratorConstants.GenType.GEN_CLIENT;
import static org.ballerinalang.openapi.utils.GeneratorConstants.MODULE_MD;

/**
 * This class generates Ballerina Services/Clients for a provided OAS definition.
 */
public class CodeGenerator {
    private String srcPackage;
    private String modelPackage;

    private static final PrintStream outStream = System.err;

    /**
     * Generates ballerina source for provided Open API Definition in {@code definitionPath}.
     * Generated source will be written to a ballerina module at {@code outPath}
     * <p>Method can be user for generating Ballerina mock services and clients</p>
     *
     * @param type           Output type. Following types are supported
     *                       <ul>
     *                       <li>mock</li>
     *                       <li>client</li>
     *                       </ul>
     * @param executionPath  Command execution path
     * @param definitionPath Input Open Api Definition file path
     * @param serviceName    Output Service Name
     * @param outPath        Destination file path to save generated source files. If not provided
     *                       {@code definitionPath} will be used as the default destination path
     * @throws IOException               when file operations fail
     * @throws BallerinaOpenApiException when code generator fails
     */
    private void generate(GenType type, String executionPath, String definitionPath,
                          String reldefinitionPath , String serviceName, String outPath)
            throws IOException, BallerinaOpenApiException {

        if (!CodegenUtils.isBallerinaProject(Paths.get(outPath))) {
            throw new BallerinaOpenApiException(OpenApiMesseges.GEN_CLIENT_PROJECT_ROOT);
        }

        //Check if the selected path is a ballerina root for service generation
        //TODO check with team for root check
        Path projectRoot = ProjectDirs.findProjectRoot(Paths.get(executionPath));
        if (type.equals(GenType.GEN_SERVICE) && projectRoot == null) {
            throw LauncherUtils.createUsageExceptionWithHelp(OpenApiMesseges.GEN_SERVICE_PROJECT_ROOT);
        }

        Path srcPath = CodegenUtils.getSourcePath(srcPackage, outPath);
        Path implPath = CodegenUtils.getImplPath(srcPackage, srcPath);

        if (type.equals(GEN_CLIENT)) {
            if (srcPackage.equals("")) {
                srcPath = srcPath.resolve("client");
                implPath = implPath.resolve("client");
            }

            if (Files.notExists(srcPath)) {
                Files.createDirectory(srcPath);
            }

            if (Files.notExists(implPath)) {
                Files.createDirectory(implPath);
            }

        }

        List<GenSrcFile> genFiles = generateBalSource(type, definitionPath, reldefinitionPath, serviceName);
        writeGeneratedSources(genFiles, srcPath, implPath, type);
    }

    /**
     * Generates ballerina source for provided Open API Definition in {@code definitionPath}.
     * Generated source will be written to a ballerina module at {@code outPath}
     * Method can be user for generating Ballerina clients.
     *
     * @param executionPath  Command execution path
     * @param definitionPath Input Open Api Definition file path
     * @param outPath        Destination file path to save generated source files. If not provided
     *                       {@code definitionPath} will be used as the default destination path
     * @throws IOException               when file operations fail
     * @throws BallerinaOpenApiException when code generator fails
     */
    public void generateClient(String executionPath, String definitionPath, String serviceName, String outPath)
            throws IOException, BallerinaOpenApiException {
        generate(GenType.GEN_CLIENT, executionPath, definitionPath, null, serviceName, outPath);
    }

    /**
     * Generates ballerina source for provided Open API Definition in {@code definitionPath}.
     * Generated source will be written to a ballerina module at {@code outPath}
     * Method can be user for generating Ballerina clients.
     *
     * @param executionPath  Command execution path
     * @param definitionPath Input Open Api Definition file path
     * @param reldefinitionPath Relative definition path to be used in the generated ballerina code
     * @param serviceName    service name for the generated service
     * @param outPath        Destination file path to save generated source files. If not provided
     *                       {@code definitionPath} will be used as the default destination path
     * @throws IOException               when file operations fail
     * @throws BallerinaOpenApiException when code generator fails
     */
    public void generateService(String executionPath, String definitionPath,
                                String reldefinitionPath, String serviceName, String outPath)
            throws IOException, BallerinaOpenApiException {
        generate(GenType.GEN_SERVICE, executionPath, definitionPath, reldefinitionPath, serviceName, outPath);
    }

    /**
     * Generates ballerina source for provided Open API Definition in {@code definitionPath}.
     * Generated code will be returned as a list of source files
     * <p>Method can be user for generating Ballerina mock services and clients</p>
     *
     * @param type           Output type. Following types are supported
     *                       <ul>
     *                       <li>mock</li>
     *                       <li>client</li>
     *                       </ul>
     * @param serviceName    Out put service name
     * @param definitionPath Input Open Api Definition file path
     * @param reldefinitionPath Relative OpenApi File
     * @return a list of generated source files wrapped as {@link GenSrcFile}
     * @throws IOException               when file operations fail
     * @throws BallerinaOpenApiException when open api context building fail
     */
    public List<GenSrcFile> generateBalSource(GenType type, String definitionPath,
                                              String reldefinitionPath, String serviceName)
            throws IOException, BallerinaOpenApiException {
        OpenAPI api = new OpenAPIV3Parser().read(definitionPath);

        if (api == null) {
            throw new BallerinaOpenApiException("Couldn't read the definition from file: " + definitionPath);
        }

        if (serviceName != null) {
            api.getInfo().setTitle(serviceName);
        } else if (api.getInfo() == null || StringUtils.isEmpty(api.getInfo().getTitle())) {
            api.getInfo().setTitle(GeneratorConstants.UNTITLED_SERVICE);
        }

        List<GenSrcFile> sourceFiles;

        switch (type) {
            case GEN_CLIENT:
                // modelPackage is not in use at the moment. All models will be written into same package
                // as other src files.
                // Therefore value set to modelPackage is ignored here
                BallerinaOpenApi definitionContext = new BallerinaOpenApi().buildContext(api).srcPackage(srcPackage)
                        .modelPackage(srcPackage);
                definitionContext.setDefinitionPath(reldefinitionPath);

                sourceFiles = generateClient(definitionContext);
                break;
            case GEN_SERVICE:

                final BallerinaOpenApiType openApi = TypeExtractorUtil.extractOpenApiObject(api);
                openApi.setBalServiceName(serviceName);
                openApi.setBalModule(srcPackage);
                openApi.setServers(api);
                openApi.setTags(api.getTags());

                if (reldefinitionPath == null) {
                    openApi.setDefPath(definitionPath.replaceAll(Pattern.quote("\\"),
                            Matcher.quoteReplacement("\\\\")));
                } else {
                    openApi.setDefPath(reldefinitionPath.replaceAll(Pattern.quote("\\"),
                            Matcher.quoteReplacement("\\\\")));
                }

                sourceFiles = generateBallerinaService(openApi);
                break;
            default:
                return null;
        }

        return sourceFiles;
    }

    /**
     * Write ballerina definition of a <code>object</code> to a file as described by <code>template.</code>
     *
     * @param object       Context object to be used by the template parser
     * @param templateDir  Directory with all the templates required for generating the source file
     * @param templateName Name of the parent template to be used
     * @param outPath      Destination path for writing the resulting source file
     * @throws IOException when file operations fail
     * @deprecated This method is now deprecated.
     * Use {@link #generateBalSource(GeneratorConstants.GenType, String, String, String) generate}
     * and implement a file write functionality your self, if you need to customize file writing steps.
     * Otherwise use {@link #generate(GeneratorConstants.GenType, String, String, String, String, String) generate}
     * to directly write generated source to a ballerina module.
     */
    @Deprecated
    public void writeBallerina(Object object, String templateDir, String templateName, String outPath)
            throws IOException {
        PrintWriter writer = null;

        try {
            Template template = compileTemplate(templateDir, templateName);
            Context context = Context.newBuilder(object).resolver(
                    MapValueResolver.INSTANCE,
                    JavaBeanValueResolver.INSTANCE,
                    FieldValueResolver.INSTANCE).build();
            writer = new PrintWriter(outPath, "UTF-8");
            writer.println(template.apply(context));
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
    }

    private Template compileTemplate(String defaultTemplateDir, String templateName) throws IOException {
        defaultTemplateDir = defaultTemplateDir.replaceAll("\\\\", "/");
        String templatesDirPath = System.getProperty(GeneratorConstants.TEMPLATES_DIR_PATH_KEY, defaultTemplateDir);
        ClassPathTemplateLoader cpTemplateLoader = new ClassPathTemplateLoader((templatesDirPath));
        FileTemplateLoader fileTemplateLoader = new FileTemplateLoader(templatesDirPath);
        cpTemplateLoader.setSuffix(GeneratorConstants.TEMPLATES_SUFFIX);
        fileTemplateLoader.setSuffix(GeneratorConstants.TEMPLATES_SUFFIX);

        Handlebars handlebars = new Handlebars().with(cpTemplateLoader, fileTemplateLoader);
        handlebars.setInfiniteLoops(true); //This will allow templates to call themselves with recursion.
        handlebars.registerHelpers(StringHelpers.class);
        handlebars.registerHelper("equals", (object, options) -> {
            CharSequence result;
            Object param0 = options.param(0);

            if (param0 == null) {
                throw new IllegalArgumentException("found 'null', expected 'string'");
            }
            if (object != null) {
                if (object.toString().equals(param0.toString())) {
                    result = options.fn(options.context);
                } else {
                    result = options.inverse();
                }
            } else {
                result = null;
            }

            return result;
        });

        return handlebars.compile(templateName);
    }

    private void writeGeneratedSources(List<GenSrcFile> sources, Path srcPath, Path implPath, GenType type)
            throws IOException {
        // Remove old generated files - if any - before regenerate
        // if srcPackage was not provided and source was written to main package nothing will be deleted.
        if (srcPackage != null && !srcPackage.isEmpty() && Files.exists(srcPath)) {
            final File[] listFiles = new File(String.valueOf(srcPath)).listFiles();
            if (listFiles != null) {
                Arrays.stream(listFiles).forEach(file -> {
                    boolean deleteStatus = true;
                    if (!file.isDirectory() && !file.getName().equals(MODULE_MD)) {
                        deleteStatus = file.delete();
                    }

                    //Capture return value of file.delete() since if
                    //unable to delete returns false from file.delete() without an exception.
                    if (!deleteStatus) {
                        outStream.println("Unable to clean module directory.");
                    }
                });
            }

        }

        for (GenSrcFile file : sources) {
            Path filePath;

            // We only overwrite files of overwritable type.
            // So non overwritable files will be written to disk only once.
            if (!file.getType().isOverwritable()) {
                filePath = implPath.resolve(file.getFileName());
                if (Files.notExists(filePath)) {
                    CodegenUtils.writeFile(filePath, file.getContent());
                }
            } else {
                filePath = srcPath.resolve(file.getFileName());
                CodegenUtils.writeFile(filePath, file.getContent());
            }
        }

        //This will print the generated files to the console
        if (type.equals(GenType.GEN_SERVICE)) {
            outStream.println("Service generated successfully and the OpenApi contract is copied to " + srcPackage
                    + "/resources. this location will be referenced throughout the ballerina project.");
        } else if (type.equals(GEN_CLIENT)) {
            outStream.println("Client generated successfully.");
        }
        outStream.println("Following files were created. \n" +
                "src/ \n- " + srcPackage);
        Iterator<GenSrcFile> iterator = sources.iterator();
        while (iterator.hasNext()) {
            outStream.println("-- " + iterator.next().getFileName());
        }
    }

    /**
     * Generate code for ballerina client.
     *
     * @param context model context to be used by the templates
     * @return generated source files as a list of {@link GenSrcFile}
     * @throws IOException when code generation with specified templates fails
     */
    private List<GenSrcFile> generateClient(BallerinaOpenApi context) throws IOException {
        if (srcPackage == null || srcPackage.isEmpty()) {
            srcPackage = GeneratorConstants.DEFAULT_CLIENT_PKG;
        }

        List<GenSrcFile> sourceFiles = new ArrayList<>();
        String srcFile = context.getInfo().getTitle().toLowerCase(Locale.ENGLISH)
                .replaceAll(" ", "_") + ".bal";

        // Generate ballerina service and resources.
        String mainContent = getContent(context, GeneratorConstants.DEFAULT_CLIENT_DIR,
                GeneratorConstants.CLIENT_TEMPLATE_NAME);
        sourceFiles.add(new GenSrcFile(GenFileType.GEN_SRC, srcPackage, srcFile, mainContent));

        // Generate ballerina records to represent schemas.
        String schemaContent = getContent(context, GeneratorConstants.DEFAULT_MODEL_DIR,
                GeneratorConstants.SCHEMA_TEMPLATE_NAME);
        sourceFiles.add(new GenSrcFile(GenFileType.MODEL_SRC, srcPackage, GeneratorConstants.SCHEMA_FILE_NAME,
                schemaContent));

        return sourceFiles;
    }

    private List<GenSrcFile> generateBallerinaService(BallerinaOpenApiType api) throws IOException {
        if (srcPackage == null || srcPackage.isEmpty()) {
            srcPackage = GeneratorConstants.DEFAULT_MOCK_PKG;
        }

        List<GenSrcFile> sourceFiles = new ArrayList<>();
        String concatTitle = api.getBalServiceName().toLowerCase(Locale.ENGLISH).replaceAll(" ", "_");
        String srcFile = concatTitle + ".bal";

        String mainContent = getContent(api, GeneratorConstants.DEFAULT_TEMPLATE_DIR + "/service",
                "balService");
        sourceFiles.add(new GenSrcFile(GenFileType.GEN_SRC, srcPackage, srcFile, mainContent));

        String schemaContent = getContent(api, GeneratorConstants.DEFAULT_TEMPLATE_DIR + "/service",
                "schemaList");
        sourceFiles.add(new GenSrcFile(GenFileType.GEN_SRC, srcPackage, GeneratorConstants.SCHEMA_FILE_NAME,
                schemaContent));

        return sourceFiles;
    }

    /**
     * Retrieve generated source content as a String value.
     *
     * @param object       context to be used by template engine
     * @param templateDir  templates directory
     * @param templateName name of the template to be used for this code generation
     * @return String with populated template
     * @throws IOException when template population fails
     */
    private String getContent(BallerinaOpenApiType object, String templateDir, String templateName) throws IOException {
        Template template = compileTemplate(templateDir, templateName);
        Context context = Context.newBuilder(object)
                .resolver(MapValueResolver.INSTANCE, JavaBeanValueResolver.INSTANCE, FieldValueResolver.INSTANCE)
                .build();
        return template.apply(context);
    }

    /**
     * Retrieve generated source content as a String value.
     *
     * @param object       context to be used by template engine
     * @param templateDir  templates directory
     * @param templateName name of the template to be used for this code generation
     * @return String with populated template
     * @throws IOException when template population fails
     */
    private String getContent(BallerinaOpenApi object, String templateDir, String templateName) throws IOException {
        Template template = compileTemplate(templateDir, templateName);
        Context context = Context.newBuilder(object)
                .resolver(MapValueResolver.INSTANCE, JavaBeanValueResolver.INSTANCE, FieldValueResolver.INSTANCE)
                .build();
        return template.apply(context);
    }

    public String getSrcPackage() {
        return srcPackage;
    }

    public void setSrcPackage(String srcPackage) {
        this.srcPackage = srcPackage;
    }

    public String getModelPackage() {
        return modelPackage;
    }

    public void setModelPackage(String modelPackage) {
        this.modelPackage = modelPackage;
    }
}

Output:
【漏洞类型】SSL/TLS配置不安全
【严重性】High
【漏洞摘要】原始代码中使用了`initializeSsl`方法来创建一个信任所有证书的SSLContext，这意味着代码会忽略服务器证书的有效性检查，从而容易受到中间人攻击（Man-in-the-Middle, MITM）的风险。修复代码中将`HttpURLConnection`替换为`HttpsURLConnection`，并移除了对`initializeSsl`方法的调用，这表明已经移除了信任所有证书的配置，但仍然需要确保安全的SSL/TLS连接建立。
【关键代码模式】与安全问题相关的关键代码模式包括：
- `initializeSsl`方法的使用，创建了一个信任所有证书的SSLContext。
- `createHttpUrlConnection`方法的使用，无论是否使用代理，都会打开一个HttpURLConnection。
- `HttpURLConnection`实例的使用，包括设置请求方法、读取响应内容等操作。
【修复方法说明】修复方法通过将`HttpURLConnection`替换为`HttpsURLConnection`，并移除对`initializeSsl`方法的调用，解决了SSL/TLS配置不安全的问题。建议在实际应用中使用更安全的SSL/TLS配置，例如配置具体的信任证书管理器，以确保服务器证书的有效性。


Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
aws-android-sdk-core/src/main/java/com/amazonaws/regions/RegionMetadataParser.java
### 代码内容：
package com.amazonaws.regions;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

/**
 * Parses a region metadata file to pull out information about the available
 * regions, names, IDs, and what service endpoints are available in each region.
 *
 * @deprecated The SDK no longer supports a regions.xml override
 */
@Deprecated
public class RegionMetadataParser {

    private static final String REGION_TAG = "Region";
    private static final String REGION_ID_TAG = "Name";
    private static final String DOMAIN_TAG = "Domain";
    private static final String ENDPOINT_TAG = "Endpoint";
    private static final String SERVICE_TAG = "ServiceName";
    private static final String HTTP_TAG = "Http";
    private static final String HTTPS_TAG = "Https";
    private static final String HOSTNAME_TAG = "Hostname";

    /**
     * Parses the specified input stream and returns a {@code RegionMetadata}
     * object.
     *
     * @param input the input stream to parse
     * @return the parsed region metadata
     * @throws IOException on error
     */
    public static RegionMetadata parse(final InputStream input)
            throws IOException {

        return new RegionMetadata(internalParse(input, false));
    }

    /**
     * @deprecated since this object is stateless
     */
    @Deprecated
    public RegionMetadataParser() {
    }

    /**
     * Parses the specified input stream and returns a list of the regions
     * declared in it. By default, verification on the region endpoints is
     * disabled.
     *
     * @param input The stream containing the region metadata to parse.
     * @return The list of parsed regions.
     * @deprecated in favor of {@link #parse(InputStream)}
     */
    @Deprecated
    public List<Region> parseRegionMetadata(InputStream input)
            throws IOException {

        return internalParse(input, false);
    }

    /**
     * Parses the specified input stream and optionally verifies that all of the
     * endpoints end in ".amazonaws.com". This method is deprecated, since not
     * all valid AWS endpoints end in ".amazonaws.com" any more.
     *
     * @param input The stream containing the region metadata to parse.
     * @param endpointVerification Whether to verify each region endpoint
     * @return The list of parsed regions.
     * @deprecated in favor of {@link #parse(InputStream)}
     */
    @Deprecated
    public List<Region> parseRegionMetadata(final InputStream input,
            final boolean endpointVerification)
            throws IOException {

        return internalParse(input, endpointVerification);
    }

    @SuppressWarnings("checkstyle:emptyblock")
    private static List<Region> internalParse(
            final InputStream input,
            final boolean endpointVerification) throws IOException {

        Document document;
        try {

            DocumentBuilderFactory factory =
                    DocumentBuilderFactory.newInstance();

            DocumentBuilder documentBuilder = factory.newDocumentBuilder();
            document = documentBuilder.parse(input);

        } catch (IOException exception) {
            throw exception;
        } catch (Exception exception) {
            throw new IOException("Unable to parse region metadata file: "
                    + exception.getMessage(),
                    exception);
        } finally {
            try {
                input.close();
            } catch (IOException exception) {
            }
        }

        NodeList regionNodes = document.getElementsByTagName(REGION_TAG);
        List<Region> regions = new ArrayList<Region>();
        for (int i = 0; i < regionNodes.getLength(); i++) {
            Node node = regionNodes.item(i);
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                Element element = (Element) node;
                regions.add(parseRegionElement(element, endpointVerification));
            }
        }

        return regions;
    }

    private static Region parseRegionElement(
            final Element regionElement,
            final boolean endpointVerification) {

        String name = getChildElementValue(REGION_ID_TAG, regionElement);
        String domain = getChildElementValue(DOMAIN_TAG, regionElement);

        Region region = new Region(name, domain);

        NodeList endpointNodes =
                regionElement.getElementsByTagName(ENDPOINT_TAG);

        for (int i = 0; i < endpointNodes.getLength(); i++) {
            addRegionEndpoint(region,
                    (Element) endpointNodes.item(i),
                    endpointVerification);
        }

        return region;
    }

    private static void addRegionEndpoint(
            final Region region,
            final Element endpointElement,
            final boolean endpointVerification) {

        String serviceName = getChildElementValue(SERVICE_TAG, endpointElement);
        String hostname = getChildElementValue(HOSTNAME_TAG, endpointElement);
        String http = getChildElementValue(HTTP_TAG, endpointElement);
        String https = getChildElementValue(HTTPS_TAG, endpointElement);

        if (endpointVerification && !verifyLegacyEndpoint(hostname)) {
            throw new IllegalStateException("Invalid service endpoint ("
                    + hostname + ") is detected.");
        }

        region.getServiceEndpoints().put(serviceName, hostname);
        region.getHttpSupport().put(serviceName, "true".equals(http));
        region.getHttpsSupport().put(serviceName, "true".equals(https));
    }

    private static String getChildElementValue(
            final String tagName,
            final Element element) {

        Node tagNode = element.getElementsByTagName(tagName).item(0);
        if (tagNode == null)
            return null;
        NodeList nodes = tagNode.getChildNodes();
        Node node = nodes.item(0);

        return node.getNodeValue();
    }

    /**
     * Returns whether the provided endpoint is a "valid" AWS service endpoint
     * ending in ".amazonaws.com".
     */
    private static boolean verifyLegacyEndpoint(String endpoint) {
        return endpoint.endsWith(".amazonaws.com");
    }
}

## 内容2
### 文件路径：
aws-android-sdk-core/src/main/java/com/amazonaws/util/XpathUtils.java
### 代码内容：
package com.amazonaws.util;

import com.amazonaws.logging.Log;
import com.amazonaws.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.nio.ByteBuffer;
import java.util.Date;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

/**
 * Utility methods for extracting data from XML documents using Xpath
 * expressions.
 */
public class XpathUtils {

    /** Shared logger */
    private static Log log = LogFactory.getLog(XpathUtils.class);

    private static DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    /**
     * InputStream to Document.
     * @param is the input stream.
     * @return the Document.
     * @throws SAXException
     * @throws IOException
     * @throws ParserConfigurationException
     */
    public static Document documentFrom(InputStream is)
            throws SAXException, IOException, ParserConfigurationException {
        is = new NamespaceRemovingInputStream(is);
        Document doc = factory.newDocumentBuilder().parse(is);
        is.close();

        return doc;
    }

    /**
     * Xml string to Document.
     * @param xml the xml string.
     * @return the Document.
     * @throws SAXException
     * @throws IOException
     * @throws ParserConfigurationException
     */
    public static Document documentFrom(String xml) throws SAXException,
            IOException, ParserConfigurationException {
        return documentFrom(new ByteArrayInputStream(xml.getBytes(StringUtils.UTF8)));
    }

    /**
     * URL to Document,
     * @param url the URL.
     * @return the Document.
     * @throws SAXException
     * @throws IOException
     * @throws ParserConfigurationException
     */
    public static Document documentFrom(URL url) throws SAXException,
            IOException, ParserConfigurationException {
        return documentFrom(url.openStream());
    }

    /**
     * Evaluates the specified XPath expression and returns the results as a
     * Double.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Double result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Double asDouble(String expression, Node node)
            throws XPathExpressionException {
        String doubleString = evaluateAsString(expression, node);
        return (isEmptyString(doubleString)) ? null : Double.valueOf(doubleString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * string.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The string result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static String asString(String expression, Node node)
            throws XPathExpressionException {
        return evaluateAsString(expression, node);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as an
     * Integer.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Integer result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Integer asInteger(String expression, Node node)
            throws XPathExpressionException {
        String intString = evaluateAsString(expression, node);
        return (isEmptyString(intString)) ? null : Integer.valueOf(intString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * Boolean.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Boolean result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Boolean asBoolean(String expression, Node node)
            throws XPathExpressionException {
        String booleanString = evaluateAsString(expression, node);
        return (isEmptyString(booleanString)) ? null : Boolean.valueOf(booleanString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * Float.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Float result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Float asFloat(String expression, Node node)
            throws XPathExpressionException {
        String floatString = evaluateAsString(expression, node);
        return (isEmptyString(floatString)) ? null : Float.valueOf(floatString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * Long.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Long result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Long asLong(String expression, Node node)
            throws XPathExpressionException {
        String longString = evaluateAsString(expression, node);
        return (isEmptyString(longString)) ? null : Long.valueOf(longString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * Byte.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Byte result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Byte asByte(String expression, Node node)
            throws XPathExpressionException {
        String byteString = evaluateAsString(expression, node);
        return (isEmptyString(byteString)) ? null : Byte.valueOf(byteString);
    }

    /**
     * Evaluates the specified XPath expression and returns the result as a
     * Date. Assumes that the node's text is formatted as an ISO 8601 date, as
     * specified by xs:dateTime.
     *
     * @param expression The XPath expression to evaluate.
     * @param node The node to run the expression on.
     * @return The Date result.
     * @throws XPathExpressionException If there was a problem processing the
     *             specified XPath expression.
     */
    public static Date asDate(String expression, Node node)
            throws XPathExpressionException {
        String dateString = evaluateAsString(expression, node);
        if (isEmptyString(dateString))
            return null;

        return DateUtils.parseISO8601Date(dateString);
    }

    /**
     * Evaluates the specified xpath expression, base64 decodes the data and
     * returns the result as a ByteBuffer.
     *
     * @param expression The Xpath expression to evaluate.
     * @param node The node on which to evaluate the expression.
     * @return A ByteBuffer of base64 decoded data from the result of evaluating
     *         the specified Xpath expression.
     * @throws XPathExpressionException If there are any problems evaluating the
     *             Xpath expression.
     */
    public static ByteBuffer asByteBuffer(String expression, Node node)
            throws XPathExpressionException {
        String base64EncodedString = evaluateAsString(expression, node);
        if (isEmptyString(base64EncodedString))
            return null;

        if (!isEmpty(node)) {
            byte[] decodedBytes = Base64.decode(base64EncodedString);
            return ByteBuffer.wrap(decodedBytes);
        }
        return null;
    }

    /**
     * Returns true if the specified node is null or has no children.
     *
     * @param node The node to test.
     * @return True if the specified node is null or has no children.
     */
    public static boolean isEmpty(Node node) {
        return (node == null);
    }

    /**
     * Returns the length of the specified node list.
     *
     * @param list The node list to measure.
     * @return The length of the specified node list.
     */
    public static int nodeLength(NodeList list) {
        return list == null ? 0 : list.getLength();
    }

    /**
     * Evaluates the specified expression on the specified node and returns the
     * result as a String.
     *
     * @param expression The Xpath expression to evaluate.
     * @param node The node on which to evaluate the expression.
     * @return The result of evaluating the specified expression, or null if the
     *         evaluation didn't return any result.
     * @throws XPathExpressionException If there are any problems evaluating the
     *             Xpath expression.
     */
    private static String evaluateAsString(String expression, Node node)
            throws XPathExpressionException {
        if (isEmpty(node))
            return null;

        if (!".".equals(expression)) {
            /*
             * If the expression being evaluated doesn't select a node, we want
             * to return null to distinguish between cases where a node isn't
             * present (which should be represented as null) and when a node is
             * present, but empty (which should be represented as the empty
             * string). We skip this test if the expression is "." since we've
             * already checked that the node exists.
             */
            if (asNode(expression, node) == null)
                return null;
        }

        String s = xpath().evaluate(expression, node);

        return s.trim();
    }

    /**
     * @param nodeName the node name.
     * @param node the node.
     * @return the Node.
     * @throws XPathExpressionException
     */
    public static Node asNode(String nodeName, Node node)
            throws XPathExpressionException {
        if (node == null)
            return null;
        return (Node) xpath().evaluate(nodeName, node, XPathConstants.NODE);
    }

    /**
     * @return true if the specified string is null or empty.
     *
     * @param s The string to test.
     * @return True if the specified string is null or empty.
     */
    private static boolean isEmptyString(String s) {
        if (s == null)
            return true;
        if ("".equals(s.trim()))
            return true;

        return false;
    }

    /**
     * @return a new instance of XPath, which is not thread safe and not
     * reentrant.
     */
    public static XPath xpath() {
        return XPathFactory.newInstance().newXPath();
    }

}

Output:
【漏洞类型】XML外部实体（XXE）注入

【严重性】高

【漏洞摘要】此代码存在XML外部实体（XXE）注入漏洞，因为未设置XML解析器的相关安全特性。在`RegionMetadataParser.java`和`XpathUtils.java`中，`DocumentBuilderFactory`实例被创建但没有禁用外部实体解析（如DOCTYPE声明、XInclude以及实体引用扩展）。这可能导致攻击者通过操控XML输入来泄露敏感信息或执行拒绝服务攻击（如读取文件、发起网络请求等）。

【关键代码模式】`DocumentBuilderFactory`实例化及使用，未设置安全特性：
- `DocumentBuilderFactory.newInstance()`
- `documentBuilder.parse(input)`

【修复方法说明】通过设置`DocumentBuilderFactory`的`disallow-doctype-decl`特性为`true`，禁用XInclude支持，并禁用实体引用扩展来防止XXE注入。最佳实践是始终对XML解析器进行安全配置，以防止外部实体解析带来的潜在安全风险。