import json # this is for django objects only #from django.core import serializers from django.http import HttpResponse, HttpResponseForbidden #from manifold.manifoldquery import ManifoldQuery from manifold.core.query import Query from manifold.core.result_value import ResultValue from manifold.manifoldapi import ManifoldAPI from manifold.manifoldresult import ManifoldException debug=False debug=True # add artificial delay in s debug_spin=0 #debug_spin=1 # pretend the server only returns - empty lists to 'get' requests - this is to mimick # misconfigurations or expired credentials or similar corner case situations debug_empty=False #debug_empty=True # turn this on if you want the fastest possible (locally cached) feedback # beware that this is very rough though... work_offline=False #work_offline=True # this view is what the javascript talks to when it sends a query # see also # myslice/urls.py # as well as # static/js/manifold.js def proxy (request,format): """the view associated with /manifold/proxy/ with the query passed using POST""" # expecting a POST if request.method != 'POST': print "manifoldproxy.api: unexpected method %s -- exiting"%request.method return # we only support json for now # if needed in the future we should probably cater for # format_in : how is the query encoded in POST # format_out: how to serve the results if format != 'json': print "manifoldproxy.proxy: unexpected format %s -- exiting"%format return try: # translate incoming POST request into a query object if debug: print 'manifoldproxy.proxy: request.POST',request.POST manifold_query = Query() #manifold_query = ManifoldQuery() manifold_query.fill_from_POST(request.POST) offline_filename="offline-%s-%s.json"%(manifold_query.action,manifold_query.object) # retrieve session for request # We allow some requests to use the ADMIN user account if manifold_query.get_from() == 'local:user' and manifold_query.get_action() == 'create': print "W: Used hardcoded demo account for admin queries" manifold_api_session_auth = {'AuthMethod': 'password', 'Username': 'demo', 'AuthString': 'demo'} else: manifold_api_session_auth = request.session['manifold']['auth'] if debug_empty and manifold_query.action.lower()=='get': json_answer=json.dumps({'code':0,'value':[]}) print "By-passing : debug_empty & 'get' request : returning a fake empty list" return HttpResponse (json_answer, mimetype="application/json") ### patch : return the latest one.. if work_offline: # if that won't work then we'll try to update anyways try: with (file(offline_filename,"r")) as f: json_answer=f.read() print "By-passing : using contents from %s"%offline_filename return HttpResponse (json_answer, mimetype="application/json") except: import traceback traceback.print_exc() print "Could not run in offline mode, PROCEEDING" pass # actually forward manifold_api= ManifoldAPI(auth=manifold_api_session_auth) if debug: print '===> manifoldproxy.proxy: sending to backend', manifold_query # for the benefit of the python code, manifoldAPI raises an exception if something is wrong # however in this case we want to propagate the complete manifold result to the js world result = manifold_api.forward(manifold_query.to_dict()) # XXX TEMP HACK if 'description' in result and result['description'] and isinstance(result['description'], (tuple, list, set, frozenset)): result [ 'description' ] = [ ResultValue.to_html (x) for x in result['description'] ] json_answer=json.dumps(result) # if in debug mode we save this so we can use offline mode later if debug: with (file(offline_filename,"w")) as f: f.write(json_answer) # this is an artificial delay added for debugging purposes only if debug_spin>0: print "Adding additional artificial delay",debug_spin import time time.sleep(debug_spin) return HttpResponse (json_answer, mimetype="application/json") except: print "** PROXY ERROR **" import traceback traceback.print_exc() #################### # see CSRF_FAILURE_VIEW in settings.py # the purpose of redefining this was to display the failure reason somehow # this however turns out disappointing/not very informative failure_answer=[ "csrf_failure" ] def csrf_failure(request, reason=""): print "CSRF failure with reason '%s'"%reason return HttpResponseForbidden (json.dumps (failure_answer), mimetype="application/json")