bots/giphy: Support bot response to empty message.

zulip_bots/zulip_bots/bots/giphy/fixtures/test_random.json

@@ -0,0 +1,24 @@
+{
+  "request": {
+    "api_url": "http://api.giphy.com/v1/gifs/random",
+    "params": {
+      "api_key": "12345678"
+    }
+  },
+  "response": {
+    "meta": {
+      "status": 200
+    },
+    "data": {
+      "images": {
+        "original": {
+          "url": "https://media0.giphy.com/media/ISumMYQyX4sSI/giphy.gif"
+        }
+      }
+    }
+  },
+  "response-headers": {
+    "status": 200,
+    "content-type": "application/json; charset=utf-8"
+  }
+}

zulip_bots/zulip_bots/bots/giphy/giphy.py

@@ -10,6 +10,7 @@ from requests.exceptions import HTTPError, ConnectionError
 from zulip_bots.custom_exceptions import ConfigValidationError
 
 GIPHY_TRANSLATE_API = 'http://api.giphy.com/v1/gifs/translate'
+GIPHY_RANDOM_API = 'http://api.giphy.com/v1/gifs/random'
 
 class GiphyHandler(object):
     '''
@@ -62,22 +63,26 @@ def get_url_gif_giphy(keyword: str, api_key: str) -> Union[int, str]:
     # Return a URL for a Giphy GIF based on keywords given.
     # In case of error, e.g. failure to fetch a GIF URL, it will
     # return a number.
-    query = {'s': keyword,
-             'api_key': api_key}
+    query = {'api_key': api_key}
+    if len(keyword) > 0:
+        query['s'] = keyword
+        url = GIPHY_TRANSLATE_API
+    else:
+        url = GIPHY_RANDOM_API
+
     try:
-        data = requests.get(GIPHY_TRANSLATE_API, params=query)
+        data = requests.get(url, params=query)
     except requests.exceptions.ConnectionError as e:  # Usually triggered by bad connection.
         logging.exception('Bad connection')
         raise
     data.raise_for_status()
+
     try:
         gif_url = data.json()['data']['images']['original']['url']
     except (TypeError, KeyError):  # Usually triggered by no result in Giphy.
         raise GiphyNoResultException()
-
     return gif_url
 
-
 def get_bot_giphy_response(message: Dict[str, str], bot_handler: Any, config_info: Dict[str, str]) -> str:
     # Each exception has a specific reply should "gif_url" return a number.
     # The bot will post the appropriate message for the error.

zulip_bots/zulip_bots/bots/giphy/test_giphy.py

@@ -7,10 +7,14 @@ from zulip_bots.test_lib import StubBotHandler, BotTestCase, get_bot_message_han
 class TestGiphyBot(BotTestCase):
     bot_name = "giphy"
 
-    # Override default function in BotTestCase
+    # Test for bot response to empty message
     def test_bot_responds_to_empty_message(self) -> None:
-        # FIXME?: Giphy does not respond to empty messages
-        pass
+        bot_response = '[Click to enlarge]' \
+                       '(https://media0.giphy.com/media/ISumMYQyX4sSI/giphy.gif)' \
+                       '[](/static/images/interactive-bot/giphy/powered-by-giphy.png)'
+        with self.mock_config_info({'key': '12345678'}), \
+                self.mock_http_conversation('test_random'):
+            self.verify_reply('', bot_response)
 
     def test_normal(self) -> None:
         bot_response = '[Click to enlarge]' \