Asana integration (#7)

* Event dispatching and webhook sending

* snekchek

4 files changed, 108 insertions, 2 deletions

diff --git a/pysite/base_route.py b/pysite/base_route.py
index 04694186..a3e8615b 100644
--- a/pysite/base_route.py
+++ b/pysite/base_route.py
@@ -33,10 +33,18 @@ class APIView(RouteView):
             "error_message": "Unknown error"
         }
 
+        http_code = 200
+
         if error_code is ErrorCodes.unknown_route:
             data["error_message"] = "Unknown API route"
-
-        return jsonify(data)
+            http_code = 404
+        elif error_code is ErrorCodes.unauthorized:
+            data["error_message"] = "Unauthorized"
+            http_code = 403
+
+        response = jsonify(data)
+        response.status_code = http_code
+        return response
 
 
 class ErrorView(BaseView):
diff --git a/pysite/constants.py b/pysite/constants.py
index 8c3d9c1c..e5a283a7 100644
--- a/pysite/constants.py
+++ b/pysite/constants.py
@@ -6,3 +6,4 @@ from enum import IntEnum
 
 class ErrorCodes(IntEnum):
     unknown_route = 0
+    unauthorized = 1
diff --git a/pysite/views/api/asana.py b/pysite/views/api/asana.py
new file mode 100644
index 00000000..ca9c5624
--- /dev/null
+++ b/pysite/views/api/asana.py
@@ -0,0 +1,96 @@
+# coding=utf-8
+import json
+import os
+
+from flask import make_response, request
+
+import requests
+
+from pysite.base_route import APIView
+from pysite.constants import ErrorCodes
+
+ASANA_KEY = os.environ.get("ASANA_KEY")
+ASANA_WEBHOOK = os.environ.get("ASANA_WEBHOOK")
+
+COLOUR_RED = 0xFF0000
+COLOUR_GREEN = 0x00FF00
+COLOUR_BLUE = 0x0000FF
+
+
+class IndexView(APIView):
+    path = "/asana/<asana_key>"
+    name = "asana"
+
+    def post(self, asana_key):
+        if asana_key != ASANA_KEY:
+            return self.error(ErrorCodes.unauthorized)
+
+        if "X-Hook-Secret" in request.headers:  # Confirm to Asana that we would like to make this hook
+            response = make_response()  # type: flask.Response
+            response.headers["X-Hook-Secret"] = request.headers["X-Hook-Secret"]
+            return response
+
+        events = request.get_json()["events"]
+
+        for event in events:
+            func_name = f"asana_{event['type']}_{event['action']}"
+
+            if hasattr(self, func_name):
+                func = getattr(self, func_name)
+            else:
+                func = self.asana_unknown
+
+            try:
+                func(**event)
+            except Exception as e:
+                pretty_event = json.dumps(event, indent=4, sort_key=True)
+
+                try:
+                    self.send_webhook(
+                        title="Error during webhook",
+                        description=f"Failed to handle webhook: {e}\n\n```json\n{pretty_event}\n```",
+                        color=COLOUR_RED
+                    )
+                except Exception as e:
+                    print(f"Fatal error sending webhook: {e}")
+
+        return "", 200  # Empty 200 response
+
+    def send_webhook(self, *, title, description, color=COLOUR_BLUE, url=None, author_name=None, author_icon=None):
+        session = requests.session()
+
+        embed = {
+            "title": title,
+            "description": description,
+            "color": color
+        }
+
+        if url:
+            embed["url"] = url
+
+        if author_name:
+            embed["author"] = {
+                "name": author_name,
+                "icon_url": author_icon
+            }
+
+        session.post(ASANA_WEBHOOK, json={"embeds": [embed]})
+
+    def asana_unknown(self, *, resource, parent, created_at, user, action, _type):
+        pretty_event = json.dumps(
+            {
+                "resource": resource,
+                "parent": parent,
+                "created_at": created_at,
+                "user": user,
+                "action": action,
+                "type": _type
+            },
+            indent=4,
+            sort_key=True
+        )
+
+        self.send_webhook(
+            title="Unknown event",
+            description=f"```json\n{pretty_event}\n```"
+        )
diff --git a/requirements.txt b/requirements.txt
index e6a3877f..101a37f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 flask==0.12.2
 rethinkdb
+requests