[FIX] web, base: POST requests handling

POST requests on routes with auth="user" are now correctly handled when
the user is not connected. Request data (form and files) are stored in
the session. Once the user is logged, redirect her to a specific route
that will reprocess the original POST request.

addons/web/controllers/main.py

@@ -670,6 +670,21 @@ class Proxy(http.Controller):
         base_url = request.httprequest.base_url
         return Client(request.httprequest.app, BaseResponse).get(path, base_url=base_url).data
 
+    @http.route('/web/proxy/post/<path:path>', type='http', auth='user', methods=['GET'])
+    def post(self, path):
+        """Effectively execute a POST request that was hooked through user login"""
+        with request.session.load_request_data() as data:
+            if not data:
+                raise werkzeug.exceptions.BadRequest()
+            from werkzeug.test import Client
+            from werkzeug.wrappers import BaseResponse
+            base_url = request.httprequest.base_url
+            query_string = request.httprequest.query_string
+            client = Client(request.httprequest.app, BaseResponse)
+            headers = {'X-Openerp-Session-Id': request.session.sid}
+            return client.post('/' + path, base_url=base_url, query_string=query_string,
+                               headers=headers, data=data)
+
 class Database(http.Controller):
 
     def _render_template(self, **d):

openerp/http.py

@@ -674,9 +674,16 @@ class HttpRequest(WebRequest):
         try:
             return super(HttpRequest, self)._handle_exception(exception)
         except SessionExpiredException:
-            if not request.params.get('noredirect'):
+            redirect = None
+            req = request.httprequest
+            if req.method == 'POST':
+                request.session.save_request_data()
+                redirect = '/web/proxy/post{r.path}?{r.query_string}'.format(r=req)
+            elif not request.params.get('noredirect'):
+                redirect = req.url
+            if redirect:
                 query = werkzeug.urls.url_encode({
-                    'redirect': request.httprequest.url,
+                    'redirect': redirect,
                 })
                 return werkzeug.utils.redirect('/web/login?%s' % query)
         except werkzeug.exceptions.HTTPException, e:
@@ -1170,6 +1177,46 @@ class OpenERPSession(werkzeug.contrib.sessions.Session):
         saved_actions = self.get('saved_actions', {})
         return saved_actions.get("actions", {}).get(key)
 
+    def save_request_data(self):
+        import uuid
+        req = request.httprequest
+        files = werkzeug.datastructures.MultiDict()
+        # NOTE we do not store files in the session itself to avoid loading them in memory.
+        #      By storing them in the session store, we ensure every worker (even ones on other
+        #      servers) can access them. It also allow stale files to be deleted by `session_gc`.
+        for f in req.files.values():
+            storename = 'file-{0}-{1}'.format(self.sid, uuid.uuid4().hex)
+            path = os.path.join(root.session_store.path, storename)
+            with open(path, 'w') as fp:
+                f.save(fp)
+            files.add(f.name, (storename, f.filename, f.content_type))
+        self['serialized_request_data'] = {
+            'form': req.form,
+            'files': files,
+        }
+
+    @contextlib.contextmanager
+    def load_request_data(self):
+        data = self.pop('serialized_request_data', None)
+        files = werkzeug.datastructures.MultiDict()
+        try:
+            if data:
+                # regenerate files filenames with the current session store
+                for name, (storename, filename, content_type) in data['files'].iteritems():
+                    path = os.path.join(root.session_store.path, storename)
+                    files.add(name, (path, filename, content_type))
+                yield werkzeug.datastructures.CombinedMultiDict([data['form'], files])
+            else:
+                yield None
+        finally:
+            # cleanup files
+            for f, _, _ in files.values():
+                try:
+                    os.unlink(f)
+                except IOError:
+                    pass
+
+
 def session_gc(session_store):
     if random.random() < 0.001:
         # we keep session one week