issue from python in encode base64 with Json Model

[RaminFarajpourCami]

BPO	25075
Nosy	@vadmium

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2015-09-12.00:30:55.177>
created_at = <Date 2015-09-11.23:37:45.993>
labels = ['type-bug', 'invalid']
title = 'issue from python in encode base64 with Json Model'
updated_at = <Date 2015-09-12.00:59:27.416>
user = 'https://bugs.python.org/RaminFarajpourCami'

bugs.python.org fields:

activity = <Date 2015-09-12.00:59:27.416>
actor = 'Ramin Farajpour Cami'
assignee = 'none'
closed = True
closed_date = <Date 2015-09-12.00:30:55.177>
closer = 'r.david.murray'
components = []
creation = <Date 2015-09-11.23:37:45.993>
creator = 'Ramin Farajpour Cami'
dependencies = []
files = []
hgrepos = []
issue_num = 25075
keywords = []
message_count = 4.0
messages = ['250502', '250504', '250505', '250507']
nosy_count = 2.0
nosy_names = ['martin.panter', 'Ramin Farajpour Cami']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25075'
versions = ['Python 2.7']

[RaminFarajpourCami]

Hi,

issue from python in encode base64 with Json Model in twice encode with base64 output python different with JAVA and C# , if programmer using rest-service in server side and other programmer using UI(Python Django) in client site , this encode different for encode and decode with match json encode model,

real example :

1- go to https://www.base64encode.org/
2- using {"userName":"admin","password":"admin"} (default UTF-8)
3-first encode oupput : "eyJ1c2VyTmFtZSI6ImFkbWluIiwicGFzc3dvcmQiOiJhZG1pbiJ9"
4-again second encode "eyJ1c2VyTmFtZSI6ImFkbWluIiwicGFzc3dvcmQiOiJhZG1pbiJ9" output :
"ZXlKMWMyVnlUbUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmlKOQ=="

now second output python json model :

Microsoft Windows [Version 6.2.9200]
(c) 2012 Microsoft Corporation. All rights reserved.

C:\Users\Matthew F4rr3ll>python
Python 2.7.7 (default, Jun  1 2014, 14:21:57) [MSC v.1500 64 bit (AMD64)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import json
>>> s1='{"userName":"admin","password":"admin"}'
>>> s2 = s1.encode("base64")
>>> e = s2.encode("base64")
>>> print e
ZXlKMWMyVnlUbUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmlKOQo=

>>
>>
>>

now check this output :
ZXlKMWMyVnlUbUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmlKOQo=
ZXlKMWMyVnlUbUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmlKOQ==

you see in two encode different in end line in ("o=" != "==")

also i know resolve this but you should fix in end line encode match with other language

Thanks,
Ramin

[vadmium]

This seems to be as documented. Have a look at the definition of “base64_codec” under <https://docs.python.org/2/library/codecs.html#python-specific-encodings\>, which says “the result always includes a trailing '\n' ”. In fact, line breaks are also added for longer encodings so that each line is ≤ 76 symbols.

>>> e.decode("base64")
'eyJ1c2VyTmFtZSI6ImFkbWluIiwicGFzc3dvcmQiOiJhZG1pbiJ9\n'

Your alternative encoding does not include that trailing newline. If you don’t want the “MIME Base-64” multiline encoding maybe you should use something like base64.b64encode() directly.

See also bpo-16473 where I proposed a patch to fix the Python 3 documentation that links to the wrong equivalent function.

[RaminFarajpourCami]

why any update in python 2.7?

you should using a function this code change :

enc_sec = ZXlKMWMyVnlUbUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmlKOQo=
url = re.sub('\o=$','',enc_sec)
result = url.replace('\n','==')
print result

[RaminFarajpourCami]

no close plz,

i using python 2.7.3 i get this output without "\n"?

code:
json_obj='{"userName": "admin", "password": "admin"}'
enc = json_obj.encode("base64")
print enc
enc_sec = re.sub('\n$','',enc)
print enc_sec
sec = enc_sec.encode("base64")
print sec

Output:
{"userName": "admin", "password": "admin"}

eyJ1c2VyTmFtZSI6ICJhZG1pbiIsICJwYXNzd29yZCI6ICJhZG1pbiJ9

ZXlKMWMyVnlUbUZ0WlNJNklDSmhaRzFwYmlJc0lDSndZWE56ZDI5eVpDSTZJQ0poWkcxcGJpSjk=