ari:Add application/json parameter support

The patch allows ARI to parse request parameters from an incoming JSON
request body, instead of requiring the request to come in as query
parameters (which is just weird for POST and DELETE) or form
parameters (which is okay, but a bit asymmetric given that all of our
responses are JSON).

For any operation that does _not_ have a parameter defined of type
body (i.e. "paramType": "body" in the API declaration), if a request
provides a request body with a Content type of "application/json", the
provided JSON document is parsed and searched for parameters.

The expected fields in the provided JSON document should match the
query parameters defined for the operation. If the parameter has
'allowMultiple' set, then the field in the JSON document may
optionally be an array of values.

(closes issue ASTERISK-22685)
Review: https://reviewboard.asterisk.org/r/2994/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@403177 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api-templates/swagger_model.py

@@ -377,8 +377,9 @@ class Operation(Stringify):
         if self.is_websocket:
             self.websocket_protocol = op_json.get('websocketProtocol')
             if self.http_method != 'GET':
-                raise ValueError(
-                    "upgrade: websocket is only valid on GET operations")
+                raise SwaggerError(
+                    "upgrade: websocket is only valid on GET operations",
+                    context)
 
         params_json = op_json.get('parameters') or []
         self.parameters = [
@@ -394,6 +395,14 @@ class Operation(Stringify):
         self.has_header_parameters = self.header_parameters and True
         self.has_parameters = self.has_query_parameters or \
             self.has_path_parameters or self.has_header_parameters
+
+        # Body param is different, since there's at most one
+        self.body_parameter = [
+            p for p in self.parameters if p.is_type('body')]
+        if len(self.body_parameter) > 1:
+            raise SwaggerError("Cannot have more than one body param", context)
+        self.body_parameter = self.body_parameter and self.body_parameter[0]
+
         self.summary = op_json.get('summary')
         self.notes = op_json.get('notes')
         err_json = op_json.get('errorResponses') or []