Add a snippet class for generating the Intercom snippet

Author: mckenna

lib/index.js

@@ -1,5 +1,6 @@
 export Client from './client';
 export User from './user';
+export Snippet from './snippet';
 
 import crypto from 'crypto';
 

lib/snippet.js

@@ -0,0 +1,79 @@
+import { IdentityVerification } from './index';
+import htmlencode from 'htmlencode';
+
+export default class Snippet {
+  constructor(settings) {
+    this.loggedOut = !settings.user_id && !settings.email;
+
+    if (!settings.app_id) {
+      throw new Error('You must provide an app_id in your Intercom settings');
+    }
+    if (!this.loggedOut && !settings.verificationSecret) {
+      throw new Error('You must provide your verification secret in your Intercom settings');
+    }
+
+    this.settings = settings;
+  }
+  create() {
+    const verificationSecret = this.getVerificationSecret();
+    const identifier = this.getIdentifier();
+    this.setUserHash(verificationSecret, identifier);
+    return this.generateSnippetHTML();
+  }
+  getVerificationSecret() {
+    const { verificationSecret } = this.settings;
+    delete this.settings.verificationSecret;
+    return verificationSecret;
+  }
+  getIdentifier() {
+    if (this.settings.user_id) {
+      return this.settings.user_id.toString();
+    } else {
+      return this.settings.email;
+    }
+  }
+  setUserHash(verificationSecret, identifier) {
+    if (this.loggedOut) {
+      return;
+    }
+
+    const userHash = IdentityVerification.userHash({
+      secretKey: verificationSecret,
+      identifier
+    });
+    this.settings.user_hash = userHash;
+  }
+  generateSnippetHTML() {
+    return `
+<script>
+  window.intercomSettings = {
+    ${this.settingsToString(this.settings)}
+  };
+</script>
+<script>(function(){var w=window;var ic=w.Intercom;if(typeof ic==="function"){ic('reattach_activator');ic('update',intercomSettings);}else{var d=document;var i=function(){i.c(arguments)};i.q=[];i.c=function(args){i.q.push(args)};w.Intercom=i;function l(){var s=d.createElement('script');s.type='text/javascript';s.async=true;s.src='https://widget.intercom.io/widget/${this.settings.app_id}';var x=d.getElementsByTagName('script')[0];x.parentNode.insertBefore(s,x);}if(w.attachEvent){w.attachEvent('onload',l);}else{w.addEventListener('load',l,false);}}})()</script>
+    `;
+  }
+  settingsToString(settings) {
+    const intercomSettings = [];
+    Object.keys(settings).map(key => {
+      if (typeof settings[key] === 'object' && settings[key] !== null) {
+        intercomSettings.push(`${key}: { ${this.settingsToString(settings[key])} }`);
+      } else {
+        const escapedKey = this.escapeString(key);
+        const value = this.escapeString(settings[key]);
+        if (typeof settings[key] === 'string') {
+          intercomSettings.push(`${escapedKey}: "${value}"`);
+        } else {
+          intercomSettings.push(`${escapedKey}: ${value}`);
+        }
+      }
+    });
+    return intercomSettings.join(', ');
+  }
+  escapeString(string) {
+    if (typeof string === 'string') {
+      string = htmlencode.htmlEncode(string).replace(/\&quot;/gi, '\\"');
+    }
+    return string;
+  }
+}

package.json

@@ -19,7 +19,8 @@
   ],
   "dependencies": {
     "bluebird": "^3.3.4",
-    "request": "^2.83.0"
+    "request": "^2.83.0",
+    "htmlencode": "^0.0.4"
   },
   "devDependencies": {
     "babel-core": "^6.7.4",
@@ -32,7 +33,7 @@
     "gulp-exclude-gitignore": "^1.0.0",
     "gulp-istanbul": "^0.10.3",
     "gulp-mocha": "^2.0.0",
-    "gulp-nsp": "^2.3.1",
+    "gulp-nsp": "^2.4.2",
     "gulp-plumber": "^1.1.0",
     "nock": "7.5.0"
   },

test/snippet.js

@@ -0,0 +1,108 @@
+import Snippet from '../lib/snippet';
+import assert from 'assert';
+
+describe('snippet', () => {
+  it('should be able to grab the verification secret', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      user_id: 1
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.getVerificationSecret(), 'abc123');
+  });
+
+  it('should grab the user_id as the identifier', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      user_id: 1,
+      email: 'peter@intercom.io'
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.getIdentifier(), 1);
+  });
+
+  it('should grab the email as the identifier if no user_id', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      email: 'peter@intercom.io'
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.getIdentifier(), 'peter@intercom.io');
+  });
+
+  it('should throw an error if there\'s no verification secret', () => {
+    const settings = {
+      app_id: 'xyz789',
+      user_id: 1
+    };
+    assert.throws(() => new Snippet(settings), Error);
+  });
+
+  it('should error if there\'s no app_id', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      user_id: 1
+    };
+    assert.throws(() => new Snippet(settings), Error);
+  });
+
+  it('should return the logged out snippet if no identifier', () => {
+    const settings = {
+      app_id: 'xyz789'
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.settingsToString(settings), 'app_id: "xyz789"');
+  });
+
+  it('should escape bad stuff', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      email: 'peter@"<script>alert(1)</script>intercom.io'
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.settingsToString(settings), 'verificationSecret: "abc123", app_id: "xyz789", email: "peter@\\"&lt;script&gt;alert(1)&lt;/script&gt;intercom.io"');
+  });
+
+  it('should not include the verification secret in the snippet html', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      user_id: 1,
+      email: 'peter@intercom.io',
+      name: 'Peter McKenna',
+      company: {
+        id: 123,
+        name: 'Intercom'
+      }
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.create().indexOf(settings.verificationSecret), -1);
+  });
+
+  it('should return the snippet html', () => {
+    const settings = {
+      verificationSecret: 'abc123',
+      app_id: 'xyz789',
+      user_id: 1,
+      email: 'peter@intercom.io',
+      name: 'Peter McKenna',
+      company: {
+        id: 123,
+        name: 'Intercom'
+      }
+    };
+    const snippet = new Snippet(settings);
+    assert.equal(snippet.create(), `
+<script>
+  window.intercomSettings = {
+    app_id: "xyz789", user_id: 1, email: "peter@intercom.io", name: "Peter McKenna", company: { id: 123, name: "Intercom" }, user_hash: "f02877f24c9dd37542268a28627ebaf2e07d0d114d9482abcdc20f60874b40b3"
+  };
+</script>
+<script>(function(){var w=window;var ic=w.Intercom;if(typeof ic==="function"){ic('reattach_activator');ic('update',intercomSettings);}else{var d=document;var i=function(){i.c(arguments)};i.q=[];i.c=function(args){i.q.push(args)};w.Intercom=i;function l(){var s=d.createElement('script');s.type='text/javascript';s.async=true;s.src='https://widget.intercom.io/widget/xyz789';var x=d.getElementsByTagName('script')[0];x.parentNode.insertBefore(s,x);}if(w.attachEvent){w.attachEvent('onload',l);}else{w.addEventListener('load',l,false);}}})()</script>
+    `);
+  });
+});