request-cert doesn't handle JSON responses

[Spindel]

We recently enabled JSON responses for the web service, however request-cert still lives in a world where it parses html.

A fix will be upcoming.

[Spindel]

for review @niligulmohar

[ooduor]

@Spindel @niligulmohar I randomly get this error. Could it be related to this issue?

(modio)[anthony@archilles request-certificate]$ ./request-cert caramel.modio.se '9772851a-b218-4a43-8d92-cdd204acec9e'
Key file 9772851a-b218-4a43-8d92-cdd204acec9e.key is valid; using it
Certificate signing request file 9772851a-b218-4a43-8d92-cdd204acec9e.csr is valid; using it
Starting new HTTPS connection (1): caramel.modio.se
"GET /d20c32c9c0d787c009629e7cecfc4e03438bca425edce3b4484fff008e4fd4ec HTTP/1.1" 504 182
Traceback (most recent call last):
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 187, in parse
    result = response.json()
  File "/home/anthony/.virtualenvs/modio/lib/python3.4/site-packages/requests-2.4.3-py3.4.egg/requests/models.py", line 793, in json
    return json.loads(self.text, **kwargs)
  File "/usr/lib64/python3.4/json/__init__.py", line 318, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python3.4/json/decoder.py", line 343, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python3.4/json/decoder.py", line 361, in raw_decode
    raise ValueError(errmsg("Expecting value", s, err.value)) from None
ValueError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./request-cert", line 5, in <module>
    main()
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 226, in main
    CertificateRequest(server=server, client_id=client_id).perform()
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 36, in perform
    self.request_cert_from_server()
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 171, in request_cert_from_server
    .format(parse(response)))
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 189, in parse
    result = parse_html(response)
  File "/opt/mapylons/secureapp/request-certificate/caramelrequest/certificaterequest.py", line 195, in parse_html
    for e in ET.fromstring(response.text).iterfind('body//'))
  File "/usr/lib64/python3.4/xml/etree/ElementTree.py", line 1325, in XML
    parser.feed(text)
xml.etree.ElementTree.ParseError: mismatched tag: line 6, column 2

[Spindel]

Could be, the first dump is the json.decode() failing, the second one is a complaint about mismatched tag in the second part.

Best would be to have a printout of what it's actually returned (Raw) before so we know why it's failing.