2 # this is for django objects only
3 #from django.core import serializers
4 from django.http import HttpResponse, HttpResponseForbidden
6 #from manifold.manifoldquery import ManifoldQuery
7 from manifold.core.query import Query
8 from manifold.core.result_value import ResultValue
9 from manifold.manifoldapi import ManifoldAPI
10 from manifold.manifoldresult import ManifoldException
15 # add artificial delay in s
19 # pretend the server only returns - empty lists to 'get' requests - this is to mimick
20 # misconfigurations or expired credentials or similar corner case situations
24 # turn this on if you want the fastest possible (locally cached) feedback
25 # beware that this is very rough though...
29 # this view is what the javascript talks to when it sends a query
33 # static/js/manifold.js
34 def proxy (request,format):
35 """the view associated with /manifold/proxy/
36 with the query passed using POST"""
39 if request.method != 'POST':
40 print "manifoldproxy.api: unexpected method %s -- exiting"%request.method
42 # we only support json for now
43 # if needed in the future we should probably cater for
44 # format_in : how is the query encoded in POST
45 # format_out: how to serve the results
47 print "manifoldproxy.proxy: unexpected format %s -- exiting"%format
50 # translate incoming POST request into a query object
51 if debug: print 'manifoldproxy.proxy: request.POST',request.POST
52 manifold_query = Query()
53 #manifold_query = ManifoldQuery()
54 manifold_query.fill_from_POST(request.POST)
55 offline_filename="offline-%s-%s.json"%(manifold_query.action,manifold_query.object)
56 # retrieve session for request
58 # We allow some requests to use the ADMIN user account
59 if (manifold_query.get_from() == 'local:user' and manifold_query.get_action() == 'create') or (manifold_query.get_from() == 'local:platform' and manifold_query.get_action() == 'get'):
60 print "W: Used hardcoded demo account for admin queries"
61 manifold_api_session_auth = {'AuthMethod': 'password', 'Username': 'demo', 'AuthString': 'demo'}
63 manifold_api_session_auth = request.session['manifold']['auth']
65 if debug_empty and manifold_query.action.lower()=='get':
66 json_answer=json.dumps({'code':0,'value':[]})
67 print "By-passing : debug_empty & 'get' request : returning a fake empty list"
68 return HttpResponse (json_answer, mimetype="application/json")
69 ### patch : return the latest one..
71 # if that won't work then we'll try to update anyways
73 with (file(offline_filename,"r")) as f:
75 print "By-passing : using contents from %s"%offline_filename
76 return HttpResponse (json_answer, mimetype="application/json")
80 print "Could not run in offline mode, PROCEEDING"
84 manifold_api= ManifoldAPI(auth=manifold_api_session_auth)
85 if debug: print '===> manifoldproxy.proxy: sending to backend', manifold_query
86 # for the benefit of the python code, manifoldAPI raises an exception if something is wrong
87 # however in this case we want to propagate the complete manifold result to the js world
90 result = manifold_api.forward(manifold_query.to_dict())
93 if 'description' in result and result['description'] and isinstance(result['description'], (tuple, list, set, frozenset)):
94 result [ 'description' ] = [ ResultValue.to_html (x) for x in result['description'] ]
96 json_answer=json.dumps(result)
97 # if in debug mode we save this so we can use offline mode later
99 with (file(offline_filename,"w")) as f:
102 # this is an artificial delay added for debugging purposes only
104 print "Adding additional artificial delay",debug_spin
106 time.sleep(debug_spin)
108 return HttpResponse (json_answer, mimetype="application/json")
111 print "** PROXY ERROR **"
113 traceback.print_exc()
116 # see CSRF_FAILURE_VIEW in settings.py
117 # the purpose of redefining this was to display the failure reason somehow
118 # this however turns out disappointing/not very informative
119 failure_answer=[ "csrf_failure" ]
120 def csrf_failure(request, reason=""):
121 print "CSRF failure with reason '%s'"%reason
122 return HttpResponseForbidden (json.dumps (failure_answer), mimetype="application/json")