[MegaCoNz] Add checksum and folder support (fix #481)

1 files changed, 133 insertions, 9 deletions

diff --git a/module/plugins/crypter/MegaCoNzFolder.py b/module/plugins/crypter/MegaCoNzFolder.py
index 442e6beea..686f67594 100644
--- a/module/plugins/crypter/MegaCoNzFolder.py
+++ b/module/plugins/crypter/MegaCoNzFolder.py
@@ -1,31 +1,155 @@
 # -*- coding: utf-8 -*-
 
+import base64
+import random
 import re
+import struct
+
+import Crypto.Cipher.AES
 
 from module.plugins.internal.Crypter import Crypter
+from module.plugins.internal.misc import decode, json
+
+
+############################ General errors ###################################
+# EINTERNAL            (-1): An internal error has occurred. Please submit a bug report, detailing the exact circumstances in which this error occurred
+# EARGS                (-2): You have passed invalid arguments to this command
+# EAGAIN               (-3): (always at the request level) A temporary congestion or server malfunction prevented your request from being processed. No data was altered. Retry. Retries must be spaced with exponential backoff
+# ERATELIMIT           (-4): You have exceeded your command weight per time quota. Please wait a few seconds, then try again (this should never happen in sane real-life applications)
+#
+############################ Upload errors ####################################
+# EFAILED              (-5): The upload failed. Please restart it from scratch
+# ETOOMANY             (-6): Too many concurrent IP addresses are accessing this upload target URL
+# ERANGE               (-7): The upload file packet is out of range or not starting and ending on a chunk boundary
+# EEXPIRED             (-8): The upload target URL you are trying to access has expired. Please request a fresh one
+#
+############################ Stream/System errors #############################
+# ENOENT               (-9): Object (typically, node or user) not found
+# ECIRCULAR           (-10): Circular linkage attempted
+# EACCESS             (-11): Access violation (e.g., trying to write to a read-only share)
+# EEXIST              (-12): Trying to create an object that already exists
+# EINCOMPLETE         (-13): Trying to access an incomplete resource
+# EKEY                (-14): A decryption operation failed (never returned by the API)
+# ESID                (-15): Invalid or expired user session, please relogin
+# EBLOCKED            (-16): User blocked
+# EOVERQUOTA          (-17): Request over quota
+# ETEMPUNAVAIL        (-18): Resource temporarily not available, please try again later
+# ETOOMANYCONNECTIONS (-19): Too many connections on this resource
+# EWRITE              (-20): Write failed
+# EREAD               (-21): Read failed
+# EAPPKEY             (-22): Invalid application key; request not processed
 
 
 class MegaCoNzFolder(Crypter):
     __name__    = "MegaCoNzFolder"
     __type__    = "crypter"
-    __version__ = "0.10"
-    __status__  = "broken"
+    __version__ = "0.11"
+    __status__  = "testing"
 
-    __pattern__ = r'(https?://(?:www\.)?mega(\.co)?\.nz/|mega:|chrome:.+?)#F!(?P<ID>[\w^_]+)!(?P<KEY>[\w,\\-]+)'
+    __pattern__ = r'(https?://(?:www\.)?mega(\.co)?\.nz/|mega:|chrome:.+?)#F!(?P<ID>[\w^_]+)!(?P<KEY>[\w,\-=]+)'
     __config__  = [("activated"         , "bool"          , "Activated"                       , True     ),
                    ("use_premium"       , "bool"          , "Use premium account if available", True     ),
                    ("folder_per_package", "Default;Yes;No", "Create folder for each package"  , "Default")]
 
     __description__ = """Mega.co.nz folder decrypter plugin"""
     __license__     = "GPLv3"
-    __authors__     = [("Walter Purcaro", "vuolter@gmail.com")]
+    __authors__     = [("Walter Purcaro", "vuolter@gmail.com"         ),
+                       ("GammaC0de",      "nitzo2001[AT]yahoo[DOT]com")]
+
+
+    API_URL     = "https://eu.api.mega.co.nz/cs"
+
+
+    def base64_decode(self, data):
+        data += '=' * (-len(data) % 4)
+        return base64.b64decode(str(data), "-_")
+
+
+    def base64_b64encode(self, data):
+        return base64.b64encode(data, "-_")
+
+
+    def a32_to_str(self, a):
+        return struct.pack(_(">%dI") % len(a), *a)  #: big-endian, unsigned int
+
+
+    def str_to_a32(self, s):
+        s += '\0' * (-len(s) % 4)  # Add padding, we need a string with a length multiple of 4
+        return struct.unpack(_(">%dI") % (len(s) / 4), s)  #: big-endian, unsigned int
+
+
+    def base64_to_a32(self, s):
+        return self.str_to_a32(self.base64_decode(s))
+
+
+    def cbc_decrypt(self, data, key):
+        cbc = Crypto.Cipher.AES.new(self.a32_to_str(key), Crypto.Cipher.AES.MODE_CBC, "\0" * 16)
+        return cbc.decrypt(data)
+
+
+    def decrypt_key(self, a, key):
+        a = self.base64_decode(a)
+        k = sum((self.str_to_a32(self.cbc_decrypt(a[_i:_i + 16], key))
+                    for _i in xrange(0, len(a), 16)), ())
 
+        self.log_debug("Decrypted Key: %s" % decode(k))
 
-    def setup(self):
-        self.req.setOption("timeout", 300)
+        return k
+
+
+    def api_response(self, **kwargs):
+        """
+        Dispatch a call to the api, see https://mega.co.nz/#developers
+        """
+        uid = random.randint(10 << 9, 10 ** 10)  #: Generate a session id, no idea where to obtain elsewhere
+
+        res = self.load(self.API_URL,
+                        get={'id': uid,
+                             'n' : self.info['pattern']['ID']},
+                        post=json.dumps([kwargs]))
+
+        self.log_debug("Api Response: " + res)
+
+        return json.loads(res)
+
+
+    def check_error(self, code):
+        ecode = abs(code)
+
+        if ecode in (9, 16, 21):
+            self.offline()
+
+        elif ecode in (3, 13, 17, 18, 19):
+            self.temp_offline()
+
+        elif ecode in (1, 4, 6, 10, 15, 21):
+            self.retry(5, 30, _("Error code: [%s]") % -ecode)
+
+        else:
+            self.fail(_("Error code: [%s]") % -ecode)
 
 
     def decrypt(self, pyfile):
-        url       = "https://mega.co.nz/#F!%s!%s" % re.match(self.__pattern__, pyfile.url).groups()
-        self.data = self.load("http://rapidgen.org/linkfinder", post={'linklisturl': url})
-        self.links = re.findall(r'(https://mega(\.co)?\.nz/#N!.+?)<', self.data)
+        id         = self.info['pattern']['ID']
+        master_key = self.info['pattern']['KEY']
+
+        self.log_debug("ID: %s" % id, "Key: %s" % master_key, "Type: public folder")
+
+        master_key =  self.base64_to_a32(master_key)
+
+        mega = self.api_response(a="f", c=1, r=1, ca=1, ssl=1)[0]
+
+        if isinstance(mega, int):
+            self.check_error(mega)
+        elif "e" in mega:
+            self.check_error(mega['e'])
+
+
+        get_node_key = lambda k: self.base64_b64encode(self.a32_to_str(self.decrypt_key(k, master_key)))
+
+        self.links = [_("https://mega.co.nz/#N!%s!%s=###n=%s") %
+                      (_f['h'],
+                       get_node_key(_f['k'][_f['k'].index(':') + 1:]),
+                       id)
+                      for _f in mega['f']
+                      if _f['t'] == 0]