URI module / json parsing problem with escaped doueble qoutes

[Lucas, Sascha]

Hi,

I'm talking to a REST/json webservice via the URI module. The webservice is correctly returning a list like this:

{ "names": [
"nameA",
"\"double quoted name\"",
"nameB"
] }

However the uri module does not retrun the json key, because json.loads(content) fails. If I comment out try/expect the last line of python trace is:

File "/usr/lib64/python2.6/json/decoder.py", line 227, in JSONArray
raise ValueError(errmsg("Expecting , delimiter", s, end))
ValueError: Expecting , delimiter: line 371 column 16 (char 10160)

In the URI module "content" key, the list looks like this (white space truncated):

\"names\": [\n \"nameA\",\n \"\"double quoted name\"\",\n \"nameB\"\n ]

I asume, that the backslash preserving the double qoute in JSON must be escaped it self:

\"names\": [\n \"nameA\",\n \"\\"double quoted name\\"\",\n \"nameB\"\n ]

Would be nice if someone can provide a quick fix for this problem.

Thanks, Sascha.

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[Michael DeHaan]

Hmm, that's curious.

Things like jsonlint pass, but it seems the Python JSON formatter does not like what you have.

Here's a simple test program:

STRING = """

{ "names": [

  "nameA",

  "\"double quoted name\"",

  "nameB"

] }

"""

import json

print json.loads(STRING)

I'm wondering if this might actually not be valid JSON, or just that there is a bug in the python json library.

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[Lucas, Sascha]

Hi Michael,

From: Michael DeHaan
Date: Mon, 15. Dec 2014 14:29

> Things like jsonlint pass, but it seems the Python JSON formatter does not like what you have.

> I'm wondering if this might actually not be valid JSON, or just that there is a bug in the python json library.

Thanks a lot. According to http://json.org/ in the picture "string" double quotes (quotation mark) must be escaped. So I assume it is valid JSON. If so, there must be something wrong with the python parser?

My temporary fix on the URI module is to remove the double occurrence of quotation marks to not confuse the parser. However, this only works because my quotation marks are at the beginning/end of the string (not in between):

-js = json.loads(content)
+js = json.loads(content.replace('""','"'))

Or in your example:

STRING = """
{ "names": [
"nameA",
"\"double quoted name\"",
"nameB"
] }
"""

import json

print json.loads(STRING.replace('""','"'))

[Lucas, Sascha]

Hi,

From: myself
Date: Tue, 16. Dec 2014 11:48
> According to http://json.org/ in the picture "string"
> double quotes (quotation mark) must be escaped. So I assume it is valid
> JSON. If so, there must be something wrong with the python parser?

httplib2 returns the content right (backslash escaped). So I assume, it gets lost somewhere inside the URI module:

import httplib2
import json
http = httplib2.Http()
response, content = http.request('http://some.test.tld/test','GET')
content
'{ "key": "\\"works\\"" }\n'
print content
{ "key": "\"works\"" }

print json.loads(content)
{u'key': u'"works"'}

I assume the correct way in URI module (function uri) is:

# Make the request, or try to :)
try:
resp, content = h.request(url, method=method, body=body, headers=headers)
r['redirected'] = redirected
r.update(resp_redir)
r.update(resp)
try:
- return r, unicode(content.decode('unicode_escape')), dest
+ return r, unicode(content.encode('string_escape').decode('unicode_escape')), dest

At least, this works for me.