Initial commit.

.gitignore

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+node_modules

README.md

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+# ep_http_hook
+
+Pushes pad updates to a remote location through HTTP POST requests. Batches
+updates to avoid overloading the remote location.
+
+## Settings
+
+```
+"ep_http_hook": {
+  "url": "https://...",
+  "hmac_key": "secret"
+}
+```
+
+## POST content
+
+The updates are sent as POST requests with the following body:
+
+* HMAC-SHA256 of the payload (in hex encoding).
+* A space character.
+* The payload data as JSON.
+
+The payload is a list of events which can be of the following types (identified
+by their `type` field):
+
+* `pad_update`: A pad was updated. The pad id is contained in the `id` field,
+  and its raw contents in the `text` field.

ep.json

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+{
+  "parts": [
+    {
+      "name": "main",
+      "hooks": {
+        "padUpdate": "ep_http_hook/main"
+      }
+    }
+  ]
+}

main.js

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+var crypto = require("crypto");
+var request = require("request");
+var settings = require('ep_etherpad-lite/node/utils/Settings');
+
+// Constants
+var BATCHING_TIME_MS = 2000;
+
+// Globals (boo).
+var pending_events = [];
+var pending_events_sender = null;
+
+function computeHmac(data) {
+  var key = settings.ep_http_hook.hmac_key || '';
+  return crypto.createHmac('sha256', key).update(data).digest('hex');
+}
+
+function sendSerializedEvents(data) {
+  request.post({ url: settings.ep_http_hook.url, body: data });
+}
+
+function sendEvent(data) {
+  if (!settings.ep_http_hook || !settings.ep_http_hook.url) {
+    return;
+  }
+
+  if (pending_events_sender) {
+    clearTimeout(pending_events_sender);
+  }
+  pending_events.push(data);
+  pending_events_sender = setTimeout(function () {
+    pending_events_sender = null;
+    var serialized_data = JSON.stringify(pending_events);
+    var data_to_send = computeHmac(serialized_data) + ' ' + serialized_data;
+    sendSerializedEvents(data_to_send);
+    pending_events = [];
+  }, BATCHING_TIME_MS);
+};
+
+exports.padUpdate = function (hook_name, context) {
+  var pad = context.pad;
+  var hook_data = {
+    type: "pad_update",
+    id: pad.id,
+    text: pad.atext.text
+  };
+  sendEvent(hook_data);
+};

package.json

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+{
+  "name": "ep_http_hook",
+  "version": "0.0.1",
+  "description": "Adds webhooks support to Etherpad lite.",
+  "homepage": "https://github.com/delroth/ep_http_hook",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/delroth/ep_http_hook"
+  },
+  "author": {
+    "name": "Pierre Bourdon",
+    "email": "delroth@gmail.com"
+  },
+  "dependencies": {
+    "crypto": "0.0.3",
+    "request": "^2.58.0"
+  }
+}