refactor REST API to use a Response object

modules/rest_api.py

@@ -7,6 +7,41 @@
 import http.server, json, socket, ssl, threading, uuid, urllib.parse
 from src import ModuleManager, utils
 
+class Response(object):
+    def __init__(self, compact=False):
+        self._compact = compact
+        self._headers = {}
+        self._data = b""
+        self.code = 200
+        self.content_type = "text/plain"
+    def write(self, data):
+        self._data += data
+    def write_text(self, data):
+        self._data += data.encode("utf8")
+    def write_json(self, obj):
+        if self._compact:
+            data = json.dumps(event_response, sort_keys=True,
+                separators=(",", ":"))
+        else:
+            data = json.dumps(event_response, sort_keys=True, indent=4)
+        self._data += data.encode("utf8")
+
+    def set_header(self, key: str, value: str):
+        self._headers[key] = value
+    def get_headers(self):
+        headers = {}
+        has_content_type = False
+        for key, value in self._headers.items():
+            if key.lower() == "content-type":
+                has_content_type = True
+            headers[key] = value
+        if not has_content_type:
+            headers["Content-Type"] = self.content_type
+        return headers
+
+    def get_data(self):
+        return self._data
+
 _bot = None
 _events = None
 _log = None
@@ -29,12 +64,12 @@ class Handler(http.server.BaseHTTPRequestHandler):
         content_length = int(self.headers.get("content-length", 0))
         return self.rfile.read(content_length)
 
-    def _respond(self, code, headers, data):
-        self.send_response(code)
-        for key, value in headers.items():
+    def _respond(self, response):
+        self.send_response(response.code)
+        for key, value in response.get_headers().items():
             self.send_header(key, value)
         self.end_headers()
-        self.wfile.write(data.encode("utf8"))
+        self.wfile.write(response.get_data())
 
     def _get_settings(self, key):
         key_setting = _bot.get_setting("api-key-%s" % key, {})
@@ -51,9 +86,8 @@ class Handler(http.server.BaseHTTPRequestHandler):
         params = self._url_params()
         data = self._body()
 
-        response = ""
-        code = 404
-        content_type = "text/plain"
+        response = Response()
+        response.code = 404
 
         hooks = _events.on("api").on(method).on(endpoint).get_hooks()
         if hooks:
@@ -74,29 +108,20 @@ class Handler(http.server.BaseHTTPRequestHandler):
                         event_response = _bot.trigger(lambda:
                             _events.on("api").on(method).on(
                             endpoint).call_for_result_unsafe(params=params,
-                            path=args, data=data, headers=headers))
+                            path=args, data=data, headers=headers,
+                            response=response))
                     except Exception as e:
                         _log.error("failed to call API endpoint \"%s\"",
                             [path], exc_info=True)
-                        code = 500
+                        response.code = 500
 
                     if not event_response == None:
-                        content_type = "application/json"
-                        if minify:
-                            response = json.dumps(event_response,
-                                sort_keys=True, separators=(",", ":"))
-                        else:
-                            response = json.dumps(event_response,
-                                sort_keys=True, indent=4)
-                        code = 200
+                        response.write_json(event_response)
+                        response.content_type = "application/json"
             else:
-                code = 401
+                response.code = 401
 
-        headers = {
-            "Content-type": content_type
-        }
-
-        self._respond(code, headers, response)
+        self._respond(response)
 
         _log.debug("[HTTP] finishing _handle for %s from %s:%d (%d)",
             [method, self.client_address[0], self.client_address[1], code])