Switch over to new serialization format.

Remove BSON from contrib.

8 files changed, 15 insertions, 545 deletions

diff --git a/libmproxy/console.py b/libmproxy/console.py
index 9bf032e6..dbeef04a 100644
--- a/libmproxy/console.py
+++ b/libmproxy/console.py
@@ -958,25 +958,25 @@ class ConsoleMaster(controller.Master):
     def view_prev_flow(self, flow):
         return self._view_nextprev_flow("prev", flow)
 
-    def _write_flows(self, path, data):
+    def _write_flows(self, path, flows):
+        self.state.last_saveload = path
         if not path:
             return 
         path = os.path.expanduser(path)
         try:
             f = file(path, "wb")
-            f.write(data)
+            fw = flow.FlowWriter(f)
+            for i in flows:
+                fw.add(i)
             f.close()
         except IOError, v:
             self.statusbar.message(v.strerror)
 
     def save_one_flow(self, path, flow):
-        data = flow.dump()
-        return self._write_flows(path, data)
+        return self._write_flows(path, [flow])
 
     def save_flows(self, path):
-        self.state.last_saveload = path
-        data = self.state.dump_flows()
-        return self._write_flows(path, data)
+        return self._write_flows(path, self.state.view)
 
     def load_flows(self, path):
         if not path:
@@ -985,7 +985,8 @@ class ConsoleMaster(controller.Master):
         path = os.path.expanduser(path)
         try:
             f = file(path, "r")
-            data = f.read()
+            fr = flow.FlowReader(f)
+            data = list(fr.stream())
             f.close()
         except IOError, v:
             return v.strerror
diff --git a/libmproxy/contrib/bson/LICENSE b/libmproxy/contrib/bson/LICENSE
deleted file mode 100644
index 8f7e0789..00000000
--- a/libmproxy/contrib/bson/LICENSE
+++ /dev/null
@@ -1,24 +0,0 @@
-Copyright (c) 2010, Kou Man Tong
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in the
-      documentation and/or other materials provided with the distribution.
-    * Neither the name of Kou Man Tong nor the
-      names of its contributors may be used to endorse or promote products
-      derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/libmproxy/contrib/bson/README b/libmproxy/contrib/bson/README
deleted file mode 100644
index 3637da53..00000000
--- a/libmproxy/contrib/bson/README
+++ /dev/null
@@ -1,5 +0,0 @@
-
-BSON module taken from here:
-
-    https://github.com/martinkou/bson
-
diff --git a/libmproxy/contrib/bson/__init__.py b/libmproxy/contrib/bson/__init__.py
deleted file mode 100644
index a3cf1bd4..00000000
--- a/libmproxy/contrib/bson/__init__.py
+++ /dev/null
@@ -1,97 +0,0 @@
-#!/usr/bin/python -OOOO
-# vim: set fileencoding=utf8 shiftwidth=4 tabstop=4 textwidth=80 foldmethod=marker :
-# Copyright (c) 2010, Kou Man Tong. All rights reserved.
-# For licensing, see LICENSE file included in the package.
-"""
-BSON serialization and deserialization logic.
-Specifications taken from: http://bsonspec.org/#/specification
-The following types are unsupported, because for data exchange purposes, they're
-over-engineered:
-	0x06 (Undefined)
-	0x07 (ObjectId)
-	0x0b (Regex - Exactly which flavor do you want? Better let higher level
-		programmers make that decision.)
-	0x0c (DBPointer)
-	0x0d (JavaScript code)
-	0x0e (Symbol)
-	0x0f (JS w/ scope)
-	0x11 (MongoDB-specific timestamp)
-
-For binaries, only the default 0x0 type is supported.
-
-
->>> a = {
-...   u"Item A" : u"String item A",
-...   u"Item D" : {u"ROFLOL" : u"Blah blah blah"},
-...   u"Item C" : [1, 123456789012345, None, "Party and Bad Romance"],
-...   u"Item B" : u"\u4e00\u9580\u4e94\u5091"
-... }
->>> def sorted(obj, dfs_stack):
-...   keys = obj.keys()
-...   keys.sort()
-...   for i in keys: yield i
-... 
->>> def reverse(obj, dfs_stack):
-...   keys = obj.keys()
-...   keys.sort(reverse = True)
-...   for i in keys: yield i
-... 
->>> serialized = dumps(a, sorted)
->>> serialized
-'\\x9f\\x00\\x00\\x00\\x02Item A\\x00\\x0e\\x00\\x00\\x00String item A\\x00\\x02Item B\\x00\\r\\x00\\x00\\x00\\xe4\\xb8\\x80\\xe9\\x96\\x80\\xe4\\xba\\x94\\xe5\\x82\\x91\\x00\\x04Item C\\x007\\x00\\x00\\x00\\x100\\x00\\x01\\x00\\x00\\x00\\x121\\x00y\\xdf\\r\\x86Hp\\x00\\x00\\n2\\x00\\x053\\x00\\x15\\x00\\x00\\x00\\x00Party and Bad Romance\\x00\\x03Item D\\x00 \\x00\\x00\\x00\\x02ROFLOL\\x00\\x0f\\x00\\x00\\x00Blah blah blah\\x00\\x00\\x00'
->>> 
->>> b = loads(serialized)
->>> b
-{u'Item C': [1, 123456789012345, None, 'Party and Bad Romance'], u'Item B': u'\\u4e00\\u9580\\u4e94\\u5091', u'Item A': u'String item A', u'Item D': {u'ROFLOL': u'Blah blah blah'}}
->>> reverse_serialized = dumps(a, reverse)
->>> reverse_serialized
-'\\x9f\\x00\\x00\\x00\\x03Item D\\x00 \\x00\\x00\\x00\\x02ROFLOL\\x00\\x0f\\x00\\x00\\x00Blah blah blah\\x00\\x00\\x04Item C\\x007\\x00\\x00\\x00\\x100\\x00\\x01\\x00\\x00\\x00\\x121\\x00y\\xdf\\r\\x86Hp\\x00\\x00\\n2\\x00\\x053\\x00\\x15\\x00\\x00\\x00\\x00Party and Bad Romance\\x00\\x02Item B\\x00\\r\\x00\\x00\\x00\\xe4\\xb8\\x80\\xe9\\x96\\x80\\xe4\\xba\\x94\\xe5\\x82\\x91\\x00\\x02Item A\\x00\\x0e\\x00\\x00\\x00String item A\\x00\\x00'
->>> c = loads(reverse_serialized)
->>> c
-{u'Item C': [1, 123456789012345, None, 'Party and Bad Romance'], u'Item B': u'\\u4e00\\u9580\\u4e94\\u5091', u'Item A': u'String item A', u'Item D': {u'ROFLOL': u'Blah blah blah'}}
-"""
-
-from codec import *
-import network
-__all__ = ["loads", "dumps"]
-
-# {{{ Serialization and Deserialization
-def dumps(obj, generator = None):
-	"""
-	Given a dict, outputs a BSON string.
-
-	generator is an optional function which accepts the dictionary/array being
-	encoded, the current DFS traversal stack, and outputs an iterator indicating
-	the correct encoding order for keys.
-	"""
-	if isinstance(obj, BSONCoding):
-		return encode_object(obj, [], generator_func = generator)
-	return encode_document(obj, [], generator_func = generator)
-
-def loads(data):
-	"""
-	Given a BSON string, outputs a dict.
-	"""
-	return decode_document(data, 0)[1]
-# }}}
-# {{{ Socket Patchers
-def patch_socket():
-	"""
-	Patches the Python socket class such that sockets can send and receive BSON
-	objects atomically.
-
-	This adds the following functions to socket:
-
-	recvbytes(bytes_needed, sock_buf = None) - reads bytes_needed bytes
-	atomically. Returns None if socket closed.
-
-	recvobj() - reads a BSON document from the socket atomically and returns
-	the deserialized dictionary. Returns None if socket closed.
-
-	sendobj(obj) - sends a BSON document to the socket atomically. 
-	"""
-	from socket import socket
-	socket.recvbytes = network._recvbytes
-	socket.recvobj = network._recvobj
-	socket.sendobj = network._sendobj
-# }}}
diff --git a/libmproxy/contrib/bson/codec.py b/libmproxy/contrib/bson/codec.py
deleted file mode 100644
index 878c94c6..00000000
--- a/libmproxy/contrib/bson/codec.py
+++ /dev/null
@@ -1,323 +0,0 @@
-#!/usr/bin/python -OOOO
-# vim: set fileencoding=utf8 shiftwidth=4 tabstop=4 textwidth=80 foldmethod=marker :
-# Copyright (c) 2010, Kou Man Tong. All rights reserved.
-# For licensing, see LICENSE file included in the package.
-"""
-Base codec functions for bson.
-"""
-import struct
-import cStringIO
-import calendar, pytz
-from datetime import datetime
-import warnings
-from abc import ABCMeta, abstractmethod
-
-# {{{ Error Classes
-class MissingClassDefinition(ValueError):
-	def __init__(self, class_name):
-		super(MissingClassDefinition, self).__init__(
-		"No class definition for class %s" % (class_name,))
-# }}}
-# {{{ Warning Classes
-class MissingTimezoneWarning(RuntimeWarning):
-	def __init__(self, *args):
-		args = list(args)
-		if len(args) < 1:
-			args.append("Input datetime object has no tzinfo, assuming UTC.")
-		super(MissingTimezoneWarning, self).__init__(*args)
-# }}}
-# {{{ Traversal Step
-class TraversalStep(object):
-	def __init__(self, parent, key):
-		self.parent = parent
-		self.key = key
-# }}}
-# {{{ Custom Object Codec
-
-class BSONCoding(object):
-	__metaclass__ = ABCMeta
-
-	@abstractmethod
-	def bson_encode(self):
-		pass
-
-	@abstractmethod
-	def bson_init(self, raw_values):
-		pass
-
-classes = {}
-
-def import_class(cls):
-	if not issubclass(cls, BSONCoding):
-		return
-
-	global classes
-	classes[cls.__name__] = cls
-
-def import_classes(*args):
-	for cls in args:
-		import_class(cls)
-
-def import_classes_from_modules(*args):
-	for module in args:
-		for item in module.__dict__:
-			if hasattr(item, "__new__") and hasattr(item, "__name__"):
-				import_class(item)
-
-def encode_object(obj, traversal_stack, generator_func):
-	values = obj.bson_encode()
-	class_name = obj.__class__.__name__
-	values["$$__CLASS_NAME__$$"] = class_name
-	return encode_document(values, traversal_stack, obj, generator_func)
-
-def encode_object_element(name, value, traversal_stack, generator_func):
-	return "\x03" + encode_cstring(name) + \
-			encode_object(value, traversal_stack,
-					generator_func = generator_func)
-
-class _EmptyClass(object):
-	pass
-
-def decode_object(raw_values):
-	global classes
-	class_name = raw_values["$$__CLASS_NAME__$$"]
-	cls = None
-	try:
-		cls = classes[class_name]
-	except KeyError, e:
-		raise MissingClassDefinition(class_name)
-
-	retval = _EmptyClass()
-	retval.__class__ = cls
-	retval.bson_init(raw_values)
-	return retval
-
-# }}}
-# {{{ Codec Logic
-def encode_string(value):
-	value = value.encode("utf8")
-	length = len(value)
-	return struct.pack("<i%dsb" % (length,), length + 1, value, 0)
-
-def decode_string(data, base):
-	length = struct.unpack("<i", data[base:base + 4])[0]
-	value = data[base + 4: base + 4 + length - 1]
-	value = value.decode("utf8")
-	return (base + 4 + length, value)
-
-def encode_cstring(value):
-	if isinstance(value, unicode):
-		value = value.encode("utf8")
-	return value + "\x00"
-
-def decode_cstring(data, base):
-	buf = cStringIO.StringIO()
-	length = 0
-	for character in data[base:]:
-		length += 1
-		if character == "\x00":
-			break
-		buf.write(character)
-	return (base + length, buf.getvalue().decode("utf8"))
-
-def encode_binary(value):
-	length = len(value)
-	return struct.pack("<ib", length, 0) + value
-
-def decode_binary(data, base):
-	length, binary_type = struct.unpack("<ib", data[base:base + 5])
-	return (base + 5 + length, data[base + 5:base + 5 + length])
-
-def encode_double(value):
-	return struct.pack("<d", value)
-
-def decode_double(data, base):
-	return (base + 8, struct.unpack("<d", data[base: base + 8])[0])
-
-
-ELEMENT_TYPES = {
-		0x01 : "double",
-		0x02 : "string",
-		0x03 : "document",
-		0x04 : "array",
-		0x05 : "binary",
-		0x08 : "boolean",
-        0x09 : "UTCdatetime",
-		0x0A : "none",
-		0x10 : "int32",
-		0x12 : "int64"
-	}
-
-def encode_double_element(name, value):
-	return "\x01" + encode_cstring(name) + encode_double(value)
-
-def decode_double_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	base, value = decode_double(data, base)
-	return (base, name, value)
-
-def encode_string_element(name, value):
-	return "\x02" + encode_cstring(name) + encode_string(value)
-
-def decode_string_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	base, value = decode_string(data, base)
-	return (base, name, value)
-
-def encode_value(name, value, buf, traversal_stack, generator_func):
-	if isinstance(value, BSONCoding):
-		buf.write(encode_object_element(name, value))
-	elif isinstance(value, float):
-		buf.write(encode_double_element(name, value))
-	elif isinstance(value, unicode):
-		buf.write(encode_string_element(name, value))
-	elif isinstance(value, dict):
-		buf.write(encode_document_element(name, value,
-			traversal_stack, generator_func))
-	elif isinstance(value, list) or isinstance(value, tuple):
-		buf.write(encode_array_element(name, value,
-			traversal_stack, generator_func))
-	elif isinstance(value, str):
-		buf.write(encode_binary_element(name, value))
-	elif isinstance(value, bool):
-		buf.write(encode_boolean_element(name, value))
-	elif isinstance(value, datetime):
-		buf.write(encode_UTCdatetime_element(name, value))
-	elif value is None:
-		buf.write(encode_none_element(name, value))
-	elif isinstance(value, int):
-		if value < -0x80000000 or value > 0x7fffffff:
-			buf.write(encode_int64_element(name, value))
-		else:
-			buf.write(encode_int32_element(name, value))
-	elif isinstance(value, long):
-		buf.write(encode_int64_element(name, value))
-
-def encode_document(obj, traversal_stack,
-		traversal_parent = None,
-		generator_func = None):
-	buf = cStringIO.StringIO()
-	key_iter = obj.iterkeys()
-	if generator_func is not None:
-		key_iter = generator_func(obj, traversal_stack)
-	for name in key_iter:
-		value = obj[name]
-		traversal_stack.append(TraversalStep(traversal_parent or obj, name))
-		encode_value(name, value, buf, traversal_stack, generator_func)
-		traversal_stack.pop()
-	e_list = buf.getvalue()
-	e_list_length = len(e_list)
-	return struct.pack("<i%dsb" % (e_list_length,), e_list_length + 4 + 1,
-			e_list, 0)
-
-def encode_array(array, traversal_stack,
-		traversal_parent = None,
-		generator_func = None):
-	buf = cStringIO.StringIO()
-	for i in xrange(0, len(array)):
-		value = array[i]
-		traversal_stack.append(TraversalStep(traversal_parent or array, i))
-		encode_value(unicode(i), value, buf, traversal_stack, generator_func)
-		traversal_stack.pop()
-	e_list = buf.getvalue()
-	e_list_length = len(e_list)
-	return struct.pack("<i%dsb" % (e_list_length,), e_list_length + 4 + 1,
-			e_list, 0)
-
-def decode_element(data, base):
-	element_type = struct.unpack("<b", data[base:base + 1])[0]
-	element_description = ELEMENT_TYPES[element_type]
-	decode_func = globals()["decode_" + element_description + "_element"]
-	return decode_func(data, base)
-
-def decode_document(data, base):
-	length = struct.unpack("<i", data[base:base + 4])[0]
-	end_point = base + length
-	base += 4
-	retval = {}
-	while base < end_point - 1:
-		base, name, value = decode_element(data, base)
-		retval[name] = value
-	if "$$__CLASS_NAME__$$" in retval:
-		retval = decode_object(retval)
-	return (end_point, retval)
-
-def encode_document_element(name, value, traversal_stack, generator_func):
-	return "\x03" + encode_cstring(name) + \
-			encode_document(value, traversal_stack,
-					generator_func = generator_func)
-
-def decode_document_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	base, value = decode_document(data, base)
-	return (base, name, value)
-
-def encode_array_element(name, value, traversal_stack, generator_func):
-	return "\x04" + encode_cstring(name) + \
-			encode_array(value, traversal_stack, generator_func = generator_func)
-
-def decode_array_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	base, value = decode_document(data, base)
-	retval = []
-	try:
-		i = 0
-		while True:
-			retval.append(value[unicode(i)])
-			i += 1
-	except KeyError:
-		pass
-	return (base, name, retval)
-
-def encode_binary_element(name, value):
-	return "\x05" + encode_cstring(name) + encode_binary(value)
-
-def decode_binary_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	base, value = decode_binary(data, base)
-	return (base, name, value)
-
-def encode_boolean_element(name, value):
-	return "\x08" + encode_cstring(name) + struct.pack("<b", value)
-
-def decode_boolean_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	value = not not struct.unpack("<b", data[base:base + 1])[0]
-	return (base + 1, name, value)
-
-def encode_UTCdatetime_element(name, value):
-	if value.tzinfo is None:
-		warnings.warn(MissingTimezoneWarning(), None, 4)
-	value = int(round(calendar.timegm(value.utctimetuple()) * 1000 +
-		(value.microsecond / 1000.0)))
-	return "\x09" + encode_cstring(name) + struct.pack("<q", value)
-
-def decode_UTCdatetime_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	value = datetime.fromtimestamp(struct.unpack("<q",
-		data[base:base + 8])[0] / 1000.0, pytz.utc)
-	return (base + 8, name, value)
-
-def encode_none_element(name, value):
-	return "\x0a" + encode_cstring(name)
-
-def decode_none_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	return (base, name, None)
-
-def encode_int32_element(name, value):
-	return "\x10" + encode_cstring(name) + struct.pack("<i", value)
-
-def decode_int32_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	value = struct.unpack("<i", data[base:base + 4])[0]
-	return (base + 4, name, value)
-
-def encode_int64_element(name, value):
-	return "\x12" + encode_cstring(name) + struct.pack("<q", value)
-
-def decode_int64_element(data, base):
-	base, name = decode_cstring(data, base + 1)
-	value = struct.unpack("<q", data[base:base + 8])[0]
-	return (base + 8, name, value)
-# }}}
diff --git a/libmproxy/contrib/bson/network.py b/libmproxy/contrib/bson/network.py
deleted file mode 100644
index f9a90d48..00000000
--- a/libmproxy/contrib/bson/network.py
+++ /dev/null
@@ -1,64 +0,0 @@
-#!/usr/bin/env python
-
-import socket
-try:
-	from cStringIO import StringIO
-except ImportError, e:
-	from StringIO import StringIO
-from struct import unpack
-from __init__ import dumps, loads
-
-def _bintoint(data):
-	return unpack("<i", data)[0]
-
-def _sendobj(self, obj):
-	"""
-	Atomically send a BSON message.
-	"""
-	data = dumps(obj)
-	self.sendall(data)
-
-def _recvobj(self):
-	"""
-	Atomic read of a BSON message.
-
-	This function either returns a dict, None, or raises a socket error.
-
-	If the return value is None, it means the socket is closed by the other side.
-	"""
-	sock_buf = self.recvbytes(4)
-	if sock_buf is None:
-		return None
-
-	message_length = _bintoint(sock_buf.getvalue())
-	sock_buf = self.recvbytes(message_length - 4, sock_buf)
-	if sock_buf is None:
-		return None
-
-	retval = loads(sock_buf.getvalue())
-	return retval
-
-
-def _recvbytes(self, bytes_needed, sock_buf = None):
-	"""
-	Atomic read of bytes_needed bytes.
-
-	This function either returns exactly the nmber of bytes requested in a
-	StringIO buffer, None, or raises a socket error.
-
-	If the return value is None, it means the socket is closed by the other side.
-	"""
-	if sock_buf is None:
-		sock_buf = StringIO()
-	bytes_count = 0
-	while bytes_count < bytes_needed:
-		chunk = self.recv(min(bytes_needed - bytes_count, 32768))
-		part_count = len(chunk)
-
-		if part_count < 1:
-			return None
-
-		bytes_count += part_count
-		sock_buf.write(chunk)
-	
-	return sock_buf
diff --git a/libmproxy/flow.py b/libmproxy/flow.py
index 6031a009..921abe1d 100644
--- a/libmproxy/flow.py
+++ b/libmproxy/flow.py
@@ -3,7 +3,6 @@
     with their responses, and provide filtering and interception facilities.
 """
 import subprocess, base64, sys, json
-from contrib import bson
 import proxy, threading, netstring
 
 class RunException(Exception):
@@ -39,15 +38,12 @@ class Flow:
 
     def script_serialize(self):
         data = self.get_state()
-        data = bson.dumps(data)
-        return base64.encodestring(data)
+        return json.dumps(data)
 
     @classmethod
     def script_deserialize(klass, data):
         try:
-            data = base64.decodestring(data)
-            data = bson.loads(data)
-        # bson.loads doesn't define a particular exception on error...
+            data = json.loads(data)
         except Exception:
             return None
         return klass.from_state(data)
@@ -86,12 +82,6 @@ class Flow:
                 )
         return f, se
 
-    def dump(self):
-        data = dict(
-                flows = [self.get_state()]
-               )
-        return bson.dumps(data)
-
     def get_state(self, nobackup=False):
         d = dict(
             request = self.request.get_state() if self.request else None,
@@ -216,17 +206,9 @@ class State:
         f.error = err
         return f
 
-    def dump_flows(self):
-        data = dict(
-                flows =[i.get_state() for i in self.view]
-               )
-        return bson.dumps(data)
-
-    def load_flows(self, js):
-        data = bson.loads(js)
-        data = [Flow.from_state(i) for i in data["flows"]]
-        self.flow_list.extend(data)
-        for i in data:
+    def load_flows(self, flows):
+        self.flow_list.extend(flows)
+        for i in flows:
             self.flow_map[i.client_conn] = i
 
     def set_limit(self, limit):
diff --git a/libmproxy/proxy.py b/libmproxy/proxy.py
index ba47ce7b..4a6d3614 100644
--- a/libmproxy/proxy.py
+++ b/libmproxy/proxy.py
@@ -64,7 +64,7 @@ def read_http_body(rfile, connection, headers, all):
         content = rfile.read()
         connection.close = True
     else:
-        content = None
+        content = ""
     return content