From 0b36a3fdb697f99fbff20693a1ed8147795680b3 Mon Sep 17 00:00:00 2001
From: li qun <qun.li@foxmail.com>
Date: Wed, 28 Feb 2018 11:11:18 +0800
Subject: [PATCH] Add function using path in URL as VNC server:port

---
 websockify/encode_url.py | 79 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 websockify/encode_url.py

diff --git a/websockify/encode_url.py b/websockify/encode_url.py
new file mode 100644
index 0000000..da78d2c
--- /dev/null
+++ b/websockify/encode_url.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+'''The program encode and decode the string with base64 and hash to validate the integrality.
+'''
+import sys
+import hashlib
+import base64
+# Please change the salt for your own project.
+SALT = "Some salt for security. liqun@ncl.sg"
+def encode(str):
+    ''' The func encode str, hash it and base64 it.'''
+    alg = hashlib.sha256()
+    alg.update(str)
+    alg.update(SALT)
+    hash = alg.hexdigest()
+    return base64.urlsafe_b64encode(hash+':'+str)
+def decode(str):
+    ''' The func decode str, validate with hash and base64.decode it.'''
+    str1 = base64.urlsafe_b64decode(str)
+    pos = str1.find(':')
+    if pos == -1: 
+        return ''
+    hash = str1[0:pos]
+    alg = hashlib.sha256()
+    alg.update(str1[pos+1:])
+    alg.update(SALT)
+    hash1 = alg.hexdigest()
+    if hash != hash1:
+        print "Error: str hash different"
+        return ''
+    return str1[pos+1:]
+def get_server_from_path(path, is_encoded):
+    '''The func decode host port from path parameter.
+    path looks like [/encode(n1.soc.cloud.ncl.sg:5901)] 
+    '''
+    try:
+        if is_encoded:
+            str = decode(path[1:])
+        else:
+            str = path[1:]
+        if str == '':
+            return '', 0
+        phost = ''
+        phost = str.split(':')[0]
+        pport = int(str.split(':')[1])
+    except:
+        return phost, 0
+    return phost, pport
+
+def test_basic():
+    '''The func test some basic func.'''
+    assert get_server_from_path('/n1.soc.cloud.ncl.sg:5901', False) == ('n1.soc.cloud.ncl.sg', 5901)
+    
+    str = "n1.soc.cloud.ncl.sg:5901"
+    enc = encode(str)
+    dec = decode(enc)
+    assert str == dec
+    assert get_server_from_path('/'+enc, True) == ('n1.soc.cloud.ncl.sg', 5901)
+def main():
+    '''The func is the main func.'''
+    import sys
+    if (len(sys.argv) == 2) and (sys.argv[1] == "test"):
+        test_basic()
+        print "Pass all test"
+        exit()
+    elif (len(sys.argv) == 2):
+        print encode(sys.argv[1])
+    elif (len(sys.argv) == 3) and (sys.argv[1] == "decode"):
+        print decode(sys.argv[2])
+    elif (len(sys.argv) == 3) and (sys.argv[1] == "debase"):
+        str1 = base64.urlsafe_b64decode(sys.argv[2])
+        print str1
+    else:
+        print '''%s [content to encode]
+        decode [content to decode]
+        test''' % sys.argv[0]
+        
+if __name__ == "__main__":
+    main()
+