🎉 Initial commit

Author: risan

.eslintignore

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+coverage

.eslintrc.js

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+module.exports = {
+  extends: [
+    "airbnb-base",
+    "plugin:prettier/recommended"
+  ]
+};

.gitignore

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+coverage
+node_modules
+yarn.lock

.npmignore

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+__tests__
+coverage
+.eslintignore
+.eslintrc.js
+jest.config.js
+yarn.lock

__tests__/get-verification-challenge.js

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+/* global test:false, expect:false */
+const getChallenge = require("../src/get-verification-challenge");
+
+test("it can get webhook verification challenge", () => {
+  expect(
+    getChallenge(
+      {
+        query: {
+          "hub.mode": "subscribe",
+          "hub.verify_token": "secret",
+          "hub.challenge": "accepted"
+        }
+      },
+      "secret"
+    )
+  ).toBe("accepted");
+});
+
+test("it throws error if hub.mode is not subscribe", () => {
+  expect(() =>
+    getChallenge({
+      query: {
+        "hub.mode": "foo"
+      }
+    })
+  ).toThrow(/mode/i);
+});
+
+test("it throws error if hub.verify_token does not match", () => {
+  expect(() =>
+    getChallenge(
+      {
+        query: {
+          "hub.mode": "subscribe",
+          "hub.verify_token": "secret"
+        }
+      },
+      "foo"
+    )
+  ).toThrow(/token/i);
+});
+
+test("it throws error if hub.challenge is missing", () => {
+  expect(() =>
+    getChallenge(
+      {
+        query: {
+          "hub.mode": "subscribe",
+          "hub.verify_token": "secret"
+        }
+      },
+      "secret"
+    )
+  ).toThrow(/challenge/i);
+});

jest.config.js

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+module.exports = {
+  testEnvironment: "node",
+  verbose: true
+};

package.json

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+{
+  "name": "fbm-webhook",
+  "description": "Facebook Messenger webhook middleware for Express",
+  "version": "1.0.0-alpha.1",
+  "license": "MIT",
+  "homepage": "https://github.com/risan/fbm-webhook",
+  "author": {
+    "name": "Risan Bagja Pradana",
+    "email": "[email protected]",
+    "url": "https://bagja.net"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/risan/fbm-webhook.git"
+  },
+  "bugs": {
+    "url": "https://github.com/risan/fbm-webhook/issues"
+  },
+  "keywords": [
+    "facebook",
+    "messenger",
+    "webhook"
+  ],
+  "main": "src/index.js",
+  "engines": {
+    "node": ">=8.0.0"
+  },
+  "scripts": {
+    "lint": "eslint ./",
+    "lint-fix": "eslint ./ --fix",
+    "test": "jest"
+  },
+  "dependencies": {
+    "express": "4.x",
+    "lodash": "^4.17.11"
+  },
+  "devDependencies": {
+    "eslint": "^5.9.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-config-prettier": "^3.3.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-prettier": "^3.0.0",
+    "jest": "^23.6.0",
+    "prettier": "^1.15.2"
+  }
+}

src/get-verification-challenge.js

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+const get = require("lodash/get");
+const has = require("lodash/has");
+
+/**
+ * Get webhook verification challenge.
+ *
+ * @param {Object} req
+ * @param {String} token
+ * @return {String}
+ */
+const getVerificationChallenge = (req, token) => {
+  if (get(req, ["query", "hub.mode"]) !== "subscribe") {
+    throw new Error("Invalid hub.mode.");
+  }
+
+  if (get(req, ["query", "hub.verify_token"]) !== token) {
+    throw new Error("Invalid hub.verify_token.");
+  }
+
+  if (!has(req, ["query", "hub.challenge"])) {
+    throw new Error("hub.challenge is missing");
+  }
+
+  return get(req, ["query", "hub.challenge"]);
+};
+
+module.exports = getVerificationChallenge;

src/verification.js

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+const express = require("express");
+const getChallenge = require("./get-verification-challenge");
+
+/**
+ * Get webhook verification middleware.
+ *
+ * @param {String} token
+ * @return {Router}
+ */
+const verification = (token = process.env.FB_VERIFY_TOKEN) => {
+  const router = express.Router();
+
+  router.get("/", (req, res) => {
+    try {
+      const challenge = getChallenge(req, token);
+      res.status(200).send(challenge);
+    } catch (error) {
+      res.status(403).send("Forbidden");
+    }
+  });
+
+  return router;
+};
+
+module.exports = verification;