blocks urls that match saved rules

Author: anikarni

.gitignore

@@ -0,0 +1 @@
+node_modules/

manifest.json

@@ -4,13 +4,13 @@
   "description": "Collective bargaining for netizens",
   "manifest_version": 2,
   "background": {
-    "scripts": ["src/picket.js"],
+    "scripts": ["src/picket/picket.js"],
     "persistent": true
   },
   "permissions": [
     "storage", "webRequest", "webRequestBlocking", "<all_urls>"
   ],
   "browser_action": {
-    "default_popup": "src/popup.html"
+    "default_popup": "src/popup/popup.html"
   }
 }

package-lock.json

@@ -0,0 +1,23 @@
+{
+  "name": "picket",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha src/**/*.spec.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/NetizensAssociation/picket.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/NetizensAssociation/picket/issues"
+  },
+  "homepage": "https://github.com/NetizensAssociation/picket#readme",
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "mocha": "^5.2.0"
+  }
+}

package.json

@@ -0,0 +1,18 @@
+const blockRequest = () => {
+  return { cancel: true }
+}
+
+const matchesRulePattern = (url) => ({ sites }) => {
+  return sites.some(pattern => new RegExp(pattern.replace('*', '.*')).test(url))
+}
+
+const applyRules = (rules) => (url) => {
+  return rules
+    .filter(matchesRulePattern(url))
+    .reduce((acc, rule) => {
+      if (rule.actions.find(a => a.action === 'block')) return blockRequest()
+      return {}
+    }, {})
+}
+
+module.exports = applyRules

src/picket.js

@@ -0,0 +1,20 @@
+const applyRules = require('./applyRules.js')
+
+const fetchRulesFromStorage = () => {
+  return new Promise((resolve) => {
+    chrome.storage.sync.get(['rules'], resolve)
+  })
+}
+
+const checkUrl = async ({ url }) => {
+  const rules = await fetchRulesFromStorage()
+  return applyRules(rules)(url)
+}
+
+chrome.webRequest.onBeforeRequest.addListener(
+  checkUrl,
+  { urls: ['<all_urls>'] },
+  ['blocking']
+)
+
+

src/picket/applyRules.js

@@ -0,0 +1,22 @@
+const { expect } = require('chai')
+const applyRules = require('./applyRules.js')
+
+describe('applyRules', () => {
+  it('cancels blocked url', () => {
+    const blockingResponse = applyRules([{
+      "sites": ["*://www.notarealwebsite.com/*"],
+      "actions": [ { "action": "block", "message": "not okay" } ]
+    }])('http://www.notarealwebsite.com')
+
+    expect(blockingResponse).to.deep.equal({ cancel: true })
+  })
+
+  it('does nothing if url not listed', () => {
+    const blockingResponse = applyRules([{
+      "sites": ["*://www.notarealwebsite.com/*"],
+      "actions": [ { "action": "block", "message": "not okay" } ]
+    }])('http://abc')
+
+    expect(blockingResponse).to.deep.equal({})
+  })
+})