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  package com.taobao.android.builder.tools.classinject;
  
  import com.alibaba.fastjson.JSON;
  import javassist.*;
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.*;
  import java.util.*;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  import java.util.jar.JarOutputStream;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipException;
  import java.util.zip.ZipOutputStream;
  
  /**
   * Code injection is done through Javassist
   * Created by shenghua.nish on 2015-10-22 Again in the afternoon.
   */
  public class CodeInjectByJavassist {
  
      public static Map<String, ClazzInjecter> sInjecterMap = new HashMap<String, ClazzInjecter>();
  
      private static Logger logger = LoggerFactory.getLogger(CodeInjectByJavassist.class);
  
      public synchronized static byte[] inject(ClassPool pool,
                                               String className,
                                               InjectParam injectParam) throws Exception {
  
          CtClass cc = pool.get(className);
          cc.defrost();
          if (className.equalsIgnoreCase("android.taobao.atlas.framework.FrameworkProperties") ||
              className.equalsIgnoreCase("android.taobao.atlas.version.VersionKernal")) {
  
              if (StringUtils.isNotBlank(injectParam.version)) {
                  CtClass ctClass = pool.get("java.lang.String");
                  CtField ctField = new CtField(ctClass, "version", cc);
                  ctField.setModifiers(Modifier.PRIVATE);
                  CtMethod ctMethod = CtNewMethod.getter("getVersion", ctField);
                  ctMethod.setModifiers(Modifier.PUBLIC);
                  CtField.Initializer initializer = CtField.Initializer.constant(injectParam.version);
                  try {
                      cc.removeField(ctField);
  
                  }catch (Exception e){
  
                  }
                  cc.addField(ctField, initializer);
                  try {
                      cc.removeMethod(ctMethod);
                  }catch (Exception e){
  
                  }
                  cc.addMethod(ctMethod);
                  logger.info(
                      "[android.taobao.atlas.framework.FrameworkProperties] inject version " +
                          injectParam.version);
              }
  
              addField(pool, cc, "bundleInfo", injectParam.bundleInfo);
              addField(pool, cc, "autoStartBundles", injectParam.autoStartBundles);
              addField(pool, cc, "preLaunch", injectParam.preLaunch);
              addField(pool, cc, "group", injectParam.group);
              addField(pool, cc, "outApp", String.valueOf(injectParam.outApp));
              addField(pool, cc, "autoStart", String.valueOf(injectParam.autoStart));
              addField(pool, cc, "blackDialogActivity", String.valueOf(injectParam.blackDialogActivity));
  
  
              if (null != injectParam.outputFile) {
                  Map output = new HashMap();
                  output.put("bundleInfo", JSON.parseArray(injectParam.bundleInfo));
                  output.put("autoStartBundles", injectParam.autoStartBundles);
                  output.put("preLaunch", injectParam.preLaunch);
                  output.put("group", injectParam.group);
                  output.put("outApp", injectParam.outApp);
                  output.put("unit_tag", injectParam.unit_tag);
                  output.put("autoStart",injectParam.autoStart);
                  output.put("blackDialogActivity",injectParam.blackDialogActivity);
                  FileUtils.write(injectParam.outputFile, JSON.toJSONString(output, true));
              }
  
          }
  
          ClazzInjecter clazzInjecter = sInjecterMap.get(className);
          if (null != clazzInjecter) {
              Map<String, String> stringMap = clazzInjecter.getInjectFields();
              if (!stringMap.isEmpty()) {
                  for (String key : stringMap.keySet()) {
                      addField(pool, cc, key, stringMap.get(key));
                  }
              }
          }
  
          if (!injectParam.removePreverify) {
              Collection<String> refClasses = cc.getRefClasses();
              if (refClasses.contains("com.taobao.verify.Verifier")) {
                  return cc.toBytecode();
              }
              boolean flag = false;
              if (className.equalsIgnoreCase("com.ut.mini.crashhandler.IUTCrashCaughtListner")) {
                  flag = true;
              }
  
              if (cc.isInterface()) {
                  final CtClass defClass = pool.get(Class.class.getName());
                  CtField defField = new CtField(defClass, "_inject_field__", cc);
                  defField.setModifiers(Modifier.STATIC | Modifier.PUBLIC | Modifier.FINAL);
                  cc.addField(defField,
                              CtField.Initializer.byExpr(
                                  "Boolean.TRUE.booleanValue()?java.lang.String.class:com.taobao.verify.Verifier"
                                      + ".class;"));
              } else {
                  CtConstructor[] ctConstructors = cc.getDeclaredConstructors();
                  if (null != ctConstructors && ctConstructors.length > 0) {
                      CtConstructor ctConstructor = ctConstructors[0];
                      ctConstructor.insertBeforeBody(
                          "if(Boolean.FALSE.booleanValue()){java.lang.String.valueOf(com.taobao.verify.Verifier"
                              + ".class);}");
                  } else {
                      final CtClass defClass = pool.get(Class.class.getName());
                      CtField defField = new CtField(defClass, "_inject_field__", cc);
                      defField.setModifiers(Modifier.STATIC);
                      cc.addField(defField,
                                  CtField.Initializer.byExpr(
                                      "Boolean.TRUE.booleanValue()?java.lang.String.class:com.taobao.verify"
                                          + ".Verifier.class;"));
                  }
              }
          }
          return cc.toBytecode();
  
      }
  
      private static void addField(ClassPool pool,
                                   CtClass cc,
                                   String key,
                                   String value) throws NotFoundException, CannotCompileException {
          if (StringUtils.isNotBlank(value)) {
              try {
                  cc.removeField(cc.getField(key));
              } catch (NotFoundException notfoundException) {
              }
              logger.info("inject key " + key + "->" + value);
              CtClass ctClass = pool.get("java.lang.String");
              CtField ctField = new CtField(ctClass, key, cc);
              ctField.setModifiers(Modifier.STATIC | Modifier.PUBLIC);
              CtField.Initializer initializer = CtField.Initializer.constant(value);
              cc.addField(ctField, initializer);
          }
      }
  
      /**
       * Inject replacement operations for class files in the specified folder
       *
       * @param pool
       * @param folder
       * @param outFolder
       * @return
       * @throws IOException
       * @throws CannotCompileException
       * @throws NotFoundException
       * @throws Exception
       */
      public static List<String> injectFolder(ClassPool pool,
                                              File folder,
                                              File outFolder,
                                              InjectParam injectParam) throws Exception {
          List<String> errorFiles = new ArrayList<String>();
          if (folder.exists() && folder.isDirectory()) {
              Collection<File> classFiles = FileUtils.listFiles(folder, new String[] {"class"}, true);
              for (File classFile : classFiles) {
                  String className = toRelative(folder, classFile.getAbsolutePath());
                  File outClassFile = new File(outFolder, className);
                  outClassFile.getParentFile().mkdirs();
                  className = StringUtils.replace(className, File.separator, ".");
                  className = className.substring(0, className.length() - 6);
                  byte[] codes;
  
                  codes = inject(pool, className, injectParam);
                  FileUtils.writeByteArrayToFile(outClassFile, codes);
  
              }
          }
          return errorFiles;
      }
  
      /**
       * The injection of code for the specified jar package
       *
       * @param inJar
       * @param outJar
       * @throws IOException
       * @throws NotFoundException
       * @throws CannotCompileException
       */
      public static List<String> inject(ClassPool pool,
                                        File inJar,
                                        File outJar,
                                        InjectParam injectParam) throws Exception {
          List<String> errorFiles = new ArrayList<String>();
          JarFile jarFile = newJarFile(inJar);
  
          outJar.getParentFile().mkdirs();
          FileOutputStream fileOutputStream = new FileOutputStream(outJar);
          JarOutputStream jos = new JarOutputStream(new BufferedOutputStream(fileOutputStream));
          Enumeration<JarEntry> jarFileEntries = jarFile.entries();
          JarEntry jarEntry = null;
          while (jarFileEntries.hasMoreElements()) {
              jarEntry = jarFileEntries.nextElement();
              String name = jarEntry.getName();
              String className = StringUtils.replace(name, File.separator, "/");
              className = StringUtils.replace(className, "/", ".");
              className = StringUtils.substring(className, 0, className.length() - 6);
              if (!StringUtils.endsWithIgnoreCase(name, ".class")) {
                  InputStream inputStream = jarFile.getInputStream(jarEntry);
                  copyStreamToJar(inputStream, jos, name, jarEntry.getTime(), jarEntry);
                  IOUtils.closeQuietly(inputStream);
              } else {
                  byte[] codes;
  
                  codes = inject(pool, className, injectParam);
                  InputStream classInstream = new ByteArrayInputStream(codes);
                  copyStreamToJar(classInstream, jos, name, jarEntry.getTime(), jarEntry);
  
              }
          }
          jarFile.close();
          IOUtils.closeQuietly(jos);
          return errorFiles;
      }
  
      private static void copyStreamToJar(InputStream zin,
                                          ZipOutputStream out,
                                          String currentName,
                                          long fileTime,
                                          ZipEntry zipEntry) throws IOException {
          // Create new entry for zip file.
          ZipEntry newEntry = new ZipEntry(currentName);
  
          // Make sure there is date and time set.
          if (fileTime != -1) {
              newEntry.setTime(fileTime); // If found set it into output file.
          }
          out.putNextEntry(newEntry);
          if (zin != null) {
              IOUtils.copy(zin, out);
          }
      }
  
      private static JarFile newJarFile(File jar) throws IOException {
          try {
              return new JarFile(jar);
          } catch (ZipException zex) {
              throw new ZipException("error in opening zip file " + jar);
          }
      }
  
      public static String toRelative(File basedir, String absolutePath) {
          absolutePath = absolutePath.replace('\\', '/');
          String basedirPath = basedir.getAbsolutePath().replace('\\', '/');
          String relative;
          if (absolutePath.startsWith(basedirPath)) {
              relative = absolutePath.substring(basedirPath.length());
              if (relative.startsWith("/")) {
                  relative = relative.substring(1);
              }
  
              if (relative.length() <= 0) {
                  relative = ".";
              }
          } else {
              relative = absolutePath;
          }
  
          return relative;
      }
  }
  