fix mandatorily depend of websocket #1198

lib/utils/deps.py

@@ -78,6 +78,17 @@ def checkDependencies():
         logger.warn(warnMsg)
         missing_libraries.add('python-ntlm')
 
+    try:
+        from websocket import ABNF
+        debugMsg = "'python websocket-client' library is found"
+        logger.debug(debugMsg)
+    except ImportError:
+        warnMsg = "sqlmap requires 'python websocket-client' third-party library for "
+        warnMsg += "if you plan to attack a web application behind websocket. "
+        warnMsg += "Download from https://pypi.python.org/pypi/websocket-client/"
+        logger.warn(warnMsg)
+        missing_libraries.add('websocket-client')
+
     if IS_WIN:
         try:
             import pyreadline