mitmproxy/libmproxy/encoding.py
Aldo Cortesi 8cc0469ee7 Tweak encoding behaviour
- Don't fail to identity encoding when an unknown encoding is specified.
- Don't constrain encodings. I want to try to modify traffic as little as
possible by default.
- When decoding, delete content-encoding header rather than set it to "identity"
- Refuse to decode/encode when there is an existing but unknown
content-encoding header.
2011-08-02 20:42:46 +12:00

74 lines
1.8 KiB
Python

"""
Utility functions for decoding response bodies.
"""
import cStringIO
import gzip, zlib
__ALL__ = ["ENCODINGS"]
ENCODINGS = set(["identity", "gzip", "deflate"])
def decode(e, content):
encoding_map = {
"identity": identity,
"gzip": decode_gzip,
"deflate": decode_deflate,
}
if e not in encoding_map:
return None
return encoding_map[e](content)
def encode(e, content):
encoding_map = {
"identity": identity,
"gzip": encode_gzip,
"deflate": encode_deflate,
}
if e not in encoding_map:
return None
return encoding_map[e](content)
def identity(content):
"""
Returns content unchanged. Identity is the default value of
Accept-Encoding headers.
"""
return content
def decode_gzip(content):
gfile = gzip.GzipFile(fileobj=cStringIO.StringIO(content))
try:
return gfile.read()
except IOError:
return None
def encode_gzip(content):
s = cStringIO.StringIO()
gf = gzip.GzipFile(fileobj=s, mode='wb')
gf.write(content)
gf.close()
return s.getvalue()
def decode_deflate(content):
"""
Returns decompressed data for DEFLATE. Some servers may respond with
compressed data without a zlib header or checksum. An undocumented
feature of zlib permits the lenient decompression of data missing both
values.
http://bugs.python.org/issue5784
"""
try:
try:
return zlib.decompress(content)
except zlib.error:
return zlib.decompress(content, -15)
except zlib.error:
return None
def encode_deflate(content):
"""
Returns compressed content, always including zlib header and checksum.
"""
return zlib.compress(content)