integrations: Add errbit integration.

Fixes #13685.

zerver/webhooks/errbit/doc.md

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+Get Zulip notifications for the Errbit error tracker!
+
+1. {!create-stream.md!}
+
+1. {!create-bot-construct-url-indented.md!}
+
+1. Go to your project's settings on the Errbit site. Click on the
+   **Edit** button for your Errbit app, and select **Webhook**.
+
+1. Enter the URL constructed above, and check **Enabled**.
+   Click **Save**.
+
+{!congrats.md!}
+
+![](/static/images/integrations/errbit/001.png)

zerver/webhooks/errbit/fixtures/error_message.json

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+{
+    "problem": {
+        "url": "https://errbit.example.com/apps/5e1ed1ff1a603f3916f4f0de/problems/5e1fe93e1a603f3916f4f0e3",
+        "_id": "5e1fe93e1a603f3916f4f0e3",
+        "app_id": "5e1ed1ff1a603f3916f4f0de",
+        "app_name": "ZulipIntegrationTest",
+        "comments_count": 0,
+        "created_at": "2020-01-15T23:40:30.989-05:00",
+        "environment": "ErrbitEnvName",
+        "error_class": "IllegalStateException",
+        "first_notice_at": "2020-01-15T23:40:30.987-05:00",
+        "hosts": {
+            "382b0f5185773fa0f67a8ed8056c7759": {
+                "count": 5,
+                "value": "N/A"
+            }
+        },
+        "issue_link": null,
+        "issue_type": null,
+        "last_notice_at": "2020-01-16T00:30:04.835-05:00",
+        "message": "Invalid state error",
+        "messages": {
+            "f721d9a468a891c5138eeb52c8b3831e": {
+                "count": 5,
+                "value": "Invalid state error"
+            }
+        },
+        "notices_count": 5,
+        "resolved": false,
+        "resolved_at": null,
+        "updated_at": "2020-01-15T23:45:19.246-05:00",
+        "user_agents": {
+            "382b0f5185773fa0f67a8ed8056c7759": {
+                "count": 5,
+                "value": "N/A"
+            }
+        },
+        "where": "unknown"
+    }
+}

zerver/webhooks/errbit/tests.py

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+# -*- coding: utf-8 -*-
+from zerver.lib.test_classes import WebhookTestCase
+
+
+class ErrBitHookTests(WebhookTestCase):
+    STREAM_NAME = 'errbit'
+    URL_TEMPLATE = u"/api/v1/external/errbit?stream={stream}&api_key={api_key}"
+    FIXTURE_DIR_NAME = 'errbit'
+
+    def test_errbit_error_message(self) -> None:
+        expected_topic = u"ZulipIntegrationTest / ErrbitEnvName"
+        expected_message = u"[IllegalStateException](https://errbit.example.com/apps/5e1ed1ff1a603f3916f4f0de/problems/5e1fe93e1a603f3916f4f0e3): \"Invalid state error\" occurred."
+        self.send_and_test_stream_message('error_message', expected_topic, expected_message)

zerver/webhooks/errbit/view.py

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+from typing import Any, Dict
+
+from django.http import HttpRequest, HttpResponse
+
+from zerver.decorator import api_key_only_webhook_view
+from zerver.lib.request import REQ, has_request_variables
+from zerver.lib.response import json_success
+from zerver.lib.webhooks.common import check_send_webhook_message
+from zerver.models import UserProfile
+
+ERRBIT_TOPIC_TEMPLATE = '{project_name}'
+ERRBIT_MESSAGE_TEMPLATE = '[{error_class}]({error_url}): "{error_message}" occurred.'
+
+@api_key_only_webhook_view('Errbit')
+@has_request_variables
+def api_errbit_webhook(request: HttpRequest, user_profile: UserProfile,
+                       payload: Dict[str, Any]=REQ(argument_type='body')) -> HttpResponse:
+    subject = get_subject(payload)
+    body = get_body(payload)
+    check_send_webhook_message(request, user_profile, subject, body)
+    return json_success()
+
+def get_subject(payload: Dict[str, Any]) -> str:
+    project = payload['problem']['app_name'] + ' / ' + payload['problem']['environment']
+    return ERRBIT_TOPIC_TEMPLATE.format(project_name=project)
+
+def get_body(payload: Dict[str, Any]) -> str:
+    data = {
+        'error_url': payload['problem']['url'],
+        'error_class': payload['problem']['error_class'],
+        'error_message': payload['problem']['message'],
+    }
+    return ERRBIT_MESSAGE_TEMPLATE.format(**data)