package com.jsql.model.injection.strategy.blind;
   
   import com.jsql.model.InjectionModel;
   import com.jsql.model.exception.StoppedByUserSlidingException;
   import com.jsql.model.injection.strategy.blind.patch.Diff;
   import com.jsql.util.LogLevelUtil;
   import org.apache.commons.lang3.RandomStringUtils;
   import org.apache.commons.lang3.StringUtils;
   import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Future;
  
  /**
   * A blind attack class using concurrent threads.
   */
  public class InjectionCharInsertion {
      
      /**
       * Log4j logger sent to view.
       */
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      // Source code of the FALSE web page (e.g. ?id=-123456789)
      private String blankFalseMark;
  
      /**
       * List of string differences found in all the FALSE queries, compared
       * to the reference page (aka opcodes). Each FALSE pages should contain
       * at least one same string, which shouldn't be present in all
       * the TRUE queries.
       */
      private List<Diff> constantTrueMark = new ArrayList<>();
      
      protected final InjectionModel injectionModel;
  
      private final String prefixSuffix;
      
      private static final String PREFIX = "prefix";
  
      private final List<String> falsy;
      
      /**
       * Create blind attack initialization.
       * If every false test are not in true mark and every true test are in
       * true test, then blind attack is confirmed.
       */
      public InjectionCharInsertion(InjectionModel injectionModel, String falseCharInsertion, String prefixSuffix) {
          this.injectionModel = injectionModel;
          this.prefixSuffix = prefixSuffix;
          
          List<String> truthy = this.injectionModel.getMediatorVendor().getVendor().instance().getTruthy();
          this.falsy = this.injectionModel.getMediatorVendor().getVendor().instance().getFalsy();
          
          // No blind
          if (truthy.isEmpty() || this.injectionModel.isStoppedByUser()) {
              return;
          }
          
          // Call the SQL request which must be FALSE (usually ?id=-123456879)
          this.blankFalseMark = this.callUrl(
              falseCharInsertion,
              "prefix:" + prefixSuffix.replace(InjectionCharInsertion.PREFIX, StringUtils.EMPTY)
          );
  
          // Concurrent calls to the FALSE statements,
          // it will use inject() from the model
          ExecutorService taskExecutor = this.injectionModel.getMediatorUtils().getThreadUtil().getExecutor("CallableCharInsertionTagTrue");
          Collection<CallableCharInsertion> listCallableTagTrue = new ArrayList<>();
          
          for (String urlTest: truthy) {
              listCallableTagTrue.add(
                  new CallableCharInsertion(
                      String.join(
                          StringUtils.SPACE,
                          prefixSuffix.replace(InjectionCharInsertion.PREFIX, RandomStringUtils.secure().next(10, "345")),
                          this.injectionModel.getMediatorVendor().getVendor().instance().getModelYaml().getStrategy().getBinary().getModeOr(),
                          urlTest
                      ),
                      this,
                      "prefix#true"
                  )
              );
          }
          
          // Delete junk from the results of FALSE statements,
          // keep only opcodes found in each and every FALSE pages.
          // Allow the user to stop the loop
          try {
              List<Future<CallableCharInsertion>> listTagTrue = taskExecutor.invokeAll(listCallableTagTrue);
              this.injectionModel.getMediatorUtils().getThreadUtil().shutdown(taskExecutor);
              for (var i = 1 ; i < listTagTrue.size() ; i++) {
                  if (this.injectionModel.isStoppedByUser()) {
                      return;
                 }
 
                 if (this.constantTrueMark.isEmpty()) {
                     this.constantTrueMark = listTagTrue.get(i).get().getOpcodes();
                 } else {
                     this.constantTrueMark.retainAll(listTagTrue.get(i).get().getOpcodes());
                 }
             }
         } catch (ExecutionException e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         } catch (InterruptedException e) {
             LOGGER.log(LogLevelUtil.IGNORE, e, e);
             Thread.currentThread().interrupt();
         }
         
         this.initFalseMarks();
     }
     
     private void initFalseMarks() {
         // Concurrent calls to the TRUE statements,
         // it will use inject() from the model.
         ExecutorService taskExecutor = this.injectionModel.getMediatorUtils().getThreadUtil().getExecutor("CallableGetBlindTagTrue");
         Collection<CallableCharInsertion> listCallableTagFalse = new ArrayList<>();
         
         for (String urlTest: this.falsy) {
             listCallableTagFalse.add(
                 new CallableCharInsertion(
                     String.join(
                         StringUtils.SPACE,
                         this.prefixSuffix.replace(InjectionCharInsertion.PREFIX, RandomStringUtils.secure().next(10, "345")),
                         this.injectionModel.getMediatorVendor().getVendor().instance().getModelYaml().getStrategy().getBinary().getModeOr(),
                         urlTest
                     ),
                     this,
                     "prefix#false"
                 )
             );
         }
         
         // Remove TRUE opcodes in the FALSE opcodes, because
         // a significant FALSE statement shouldn't contain any TRUE opcode.
         // Allow the user to stop the loop.
         try {
             List<Future<CallableCharInsertion>> listTagFalse = taskExecutor.invokeAll(listCallableTagFalse);
             this.injectionModel.getMediatorUtils().getThreadUtil().shutdown(taskExecutor);
         
             for (Future<CallableCharInsertion> falseTag: listTagFalse) {
                 if (this.injectionModel.isStoppedByUser()) {
                     return;
                 }
                 this.constantTrueMark.removeAll(falseTag.get().getOpcodes());
             }
         } catch (ExecutionException e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         } catch (InterruptedException e) {
             LOGGER.log(LogLevelUtil.IGNORE, e, e);
             Thread.currentThread().interrupt();
         }
     }
 
     public boolean isInjectable() throws StoppedByUserSlidingException {
         if (this.injectionModel.isStoppedByUser()) {
             throw new StoppedByUserSlidingException();
         }
         var blindTest = new CallableCharInsertion(
             String.join(
                 StringUtils.SPACE,
                 this.prefixSuffix.replace(InjectionCharInsertion.PREFIX, RandomStringUtils.secure().next(10, "678")),
                 this.injectionModel.getMediatorVendor().getVendor().instance().getModelYaml().getStrategy().getBinary().getModeOr(),
                 this.injectionModel.getMediatorVendor().getVendor().instance().sqlTestBinaryInit()
             ),
             this,
             "prefix#confirm"
         );
         try {
             blindTest.call();
         } catch (Exception e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         }
         return blindTest.isTrue() && !this.constantTrueMark.isEmpty();
     }
     
     public String callUrl(String urlString, String metadataInjectionProcess) {
         return this.injectionModel.injectWithoutIndex(urlString, metadataInjectionProcess);
     }
 
     public String callUrl(String urlString, String metadataInjectionProcess, AbstractCallableBinary<?> callableBoolean) {
         return this.injectionModel.injectWithoutIndex(urlString, metadataInjectionProcess, callableBoolean);
     }
 
 
     // Getter
 
     public String getBlankFalseMark() {
         return this.blankFalseMark;
     }
     
     public List<Diff> getConstantTrueMark() {
         return this.constantTrueMark;
     }
 }