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
13 from manifold.util.log import Log
14 from myslice.config import Config
19 # add artificial delay in s
23 # pretend the server only returns - empty lists to 'get' requests - this is to mimick
24 # misconfigurations or expired credentials or similar corner case situations
28 # Historically we had a feature for developing without an Internet connection
29 # However this won't work anymore as the python layer itself does manifold calls
30 # before javascript has a chance to do so.
31 # Might still come in handy if you want the fastest possible (locally cached) feedback
32 # beware that this is very rough though...
36 # this view is what the javascript talks to when it sends a query
40 # static/js/manifold.js
41 def proxy (request,format):
42 """the view associated with /manifold/proxy/
43 with the query passed using POST"""
46 if request.method != 'POST':
47 print "manifoldproxy.api: unexpected method %s -- exiting"%request.method
49 # we only support json for now
50 # if needed in the future we should probably cater for
51 # format_in : how is the query encoded in POST
52 # format_out: how to serve the results
54 print "manifoldproxy.proxy: unexpected format %s -- exiting"%format
57 # translate incoming POST request into a query object
58 if debug: print 'manifoldproxy.proxy: request.POST',request.POST
59 manifold_query = Query()
60 #manifold_query = ManifoldQuery()
61 manifold_query.fill_from_POST(request.POST)
62 offline_filename="%s/../offline-%s-%s.json"%(os.path.dirname(__file__),manifold_query.action,manifold_query.object)
63 # retrieve session for request
65 # We allow some requests to use the ADMIN user account
66 if (manifold_query.get_from() == 'local:user' and manifold_query.get_action() == 'create') \
67 or (manifold_query.get_from() == 'local:platform' and manifold_query.get_action() == 'get'):
68 admin_user, admin_password = Config().manifold_admin_user_password()
69 manifold_api_session_auth = {'AuthMethod': 'password', 'Username': admin_user, 'AuthString': admin_password}
71 manifold_api_session_auth = request.session['manifold']['auth']
73 if debug_empty and manifold_query.action.lower()=='get':
74 json_answer=json.dumps({'code':0,'value':[]})
75 print "By-passing : debug_empty & 'get' request : returning a fake empty list"
76 return HttpResponse (json_answer, mimetype="application/json")
77 ### patch : return the latest one..
79 # if that won't work then we'll try to update anyways
81 with (file(offline_filename,"r")) as f:
83 print "By-passing : using contents from %s"%offline_filename
84 return HttpResponse (json_answer, mimetype="application/json")
88 print "Could not run in offline mode, PROCEEDING"
92 manifold_api= ManifoldAPI(auth=manifold_api_session_auth)
93 if debug: print '===> manifoldproxy.proxy: sending to backend', manifold_query
94 # for the benefit of the python code, manifoldAPI raises an exception if something is wrong
95 # however in this case we want to propagate the complete manifold result to the js world
97 result = manifold_api.forward(manifold_query.to_dict())
100 if 'description' in result and result['description'] \
101 and isinstance(result['description'], (tuple, list, set, frozenset)):
102 result [ 'description' ] = [ ResultValue.to_html (x) for x in result['description'] ]
104 json_answer=json.dumps(result)
105 # if in debug mode we save this so we can use offline mode later
107 with (file(offline_filename,"w")) as f:
110 # this is an artificial delay added for debugging purposes only
112 print "Adding additional artificial delay",debug_spin
114 time.sleep(debug_spin)
116 return HttpResponse (json_answer, mimetype="application/json")
119 print "** PROXY ERROR **",e
121 traceback.print_exc()
124 # see CSRF_FAILURE_VIEW in settings.py
125 # the purpose of redefining this was to display the failure reason somehow
126 # this however turns out disappointing/not very informative
127 failure_answer=[ "csrf_failure" ]
128 def csrf_failure(request, reason=""):
129 print "CSRF failure with reason '%s'"%reason
130 return HttpResponseForbidden (json.dumps (failure_answer), mimetype="application/json")