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