Add tests for csp.js

Since we lack of tests but got some great point to start, let's write
more tests.

This patch provides some basic tests for our CSP library. It's more an
integration than a unit test, but gets the job done.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

package.json

@@ -184,6 +184,7 @@
     "less-loader": "^4.1.0",
     "mini-css-extract-plugin": "^0.4.1",
     "mocha": "^5.2.0",
+    "mock-require": "^3.0.3",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
     "script-loader": "^0.7.2",
     "string-loader": "^0.0.1",

test/csp.js

@@ -0,0 +1,124 @@
+/* eslint-env node, mocha */
+'use strict'
+
+const assert = require('assert')
+const crypto = require('crypto')
+const fs = require('fs')
+const path = require('path')
+const mock = require('mock-require')
+
+describe('Content security policies', function () {
+  let defaultConfig, csp
+
+  before(function () {
+    csp = require('../lib/csp')
+  })
+
+  beforeEach(function () {
+    // Reset config to make sure we don't influence other tests
+    defaultConfig = {
+      csp: {
+        enable: true,
+        directives: {
+        },
+        addDefaults: true,
+        addDisqus: true,
+        addGoogleAnalytics: true,
+        upgradeInsecureRequests: 'auto',
+        reportURI: undefined
+      },
+      useCDN: true
+    }
+  })
+
+  afterEach(function () {
+    mock.stop('../lib/config')
+    csp = mock.reRequire('../lib/csp')
+  })
+
+  after(function () {
+    mock.stopAll()
+    csp = mock.reRequire('../lib/csp')
+  })
+
+  // beginnging Tests
+  it('Disable CDN', function () {
+    let testconfig = defaultConfig
+    testconfig.useCDN = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://cdn.mathjax.org'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://fonts.googleapis.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://cdnjs.cloudflare.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://fonts.gstatic.com'))
+  })
+
+  it('Disable Google Analytics', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.addGoogleAnalytics = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://www.google-analytics.com'))
+  })
+
+  it('Disable Disqus', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.addDisqus = false
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert(!csp.computeDirectives().scriptSrc.includes('https://disqus.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://*.disqus.com'))
+    assert(!csp.computeDirectives().scriptSrc.includes('https://*.disquscdn.com'))
+    assert(!csp.computeDirectives().styleSrc.includes('https://*.disquscdn.com'))
+    assert(!csp.computeDirectives().fontSrc.includes('https://*.disquscdn.com'))
+  })
+
+  it('Set ReportURI', function () {
+    let testconfig = defaultConfig
+    testconfig.csp.reportURI = 'https://example.com/reportURI'
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    assert.strictEqual(csp.computeDirectives().reportUri, 'https://example.com/reportURI')
+  })
+
+  it('Set own directives', function () {
+    let testconfig = defaultConfig
+    mock('../lib/config', defaultConfig)
+    csp = mock.reRequire('../lib/csp')
+    const unextendedCSP = csp.computeDirectives()
+    testconfig.csp.directives = {
+      defaultSrc: ['https://default.example.com'],
+      scriptSrc: ['https://script.example.com'],
+      imgSrc: ['https://img.example.com'],
+      styleSrc: ['https://style.example.com'],
+      fontSrc: ['https://font.example.com'],
+      objectSrc: ['https://object.example.com'],
+      mediaSrc: ['https://media.example.com'],
+      childSrc: ['https://child.example.com'],
+      connectSrc: ['https://connect.example.com']
+    }
+    mock('../lib/config', testconfig)
+    csp = mock.reRequire('../lib/csp')
+
+    const variations = ['default', 'script', 'img', 'style', 'font', 'object', 'media', 'child', 'connect']
+
+    for (let i = 0; i < variations.length; i++) {
+      assert.strictEqual(csp.computeDirectives()[variations[i] + 'Src'].toString(), ['https://' + variations[i] + '.example.com'].concat(unextendedCSP[variations[i] + 'Src']).toString())
+    }
+  })
+
+  /*
+   * This test reminds us to update the CSP hash for the speaker notes
+   */
+  it('Unchanged hash for reveal.js speaker notes plugin', function () {
+    const hash = crypto.createHash('sha1')
+    hash.update(fs.readFileSync(path.resolve(__dirname, '../node_modules/reveal.js/plugin/notes/notes.html'), 'utf8'), 'utf8')
+    assert.strictEqual(hash.digest('hex'), '471f3826880fac884a4a14faabc492bc854ae994')
+  })
+})