first commit

Author: James Fray

common.js

@@ -0,0 +1,114 @@
+/* globals validate */
+'use strict';
+
+var app = {};
+app.callbacks = {};
+app.on = (id, callback) => {
+  app.callbacks[id] = app.callbacks[id] || [];
+  app.callbacks[id].push(callback);
+};
+app.emit = (id, value) => (app.callbacks[id] || []).forEach(c => c(value));
+
+var decentraleyes = {};
+
+// importing from detection module from https://github.com/Synzvato/decentraleyes project
+(function (iframe) {
+  iframe.src = './decentraleyes/loader.html';
+  iframe.onload = function () {
+    decentraleyes.getLocalTarget = iframe.contentWindow.exports.getLocalTarget;
+    decentraleyes.mappings = iframe.contentWindow.mappings;
+    decentraleyes.resources = iframe.contentWindow.resources;
+    app.emit('decentraleyes-ready');
+  };
+  document.body.appendChild(iframe);
+})(document.createElement('iframe'));
+
+app.on('decentraleyes-ready', () => {
+  let mappings = decentraleyes.mappings;
+  let filter = {
+    urls: [],
+    types: ['script', 'xmlhttprequest']
+  };
+  for (let host in mappings) {
+    for (let path in mappings[host]) {
+      filter.urls.push('*://' + host + path + '*');
+    }
+  }
+  app.emit('filter-ready', filter);
+});
+
+var cache = {};
+
+// redirecting to local resource if possible
+app.on('filter-ready', (filter) => {
+  chrome.webRequest.onBeforeRequest.addListener(d => {
+    let url = new URL(d.url);
+    let obj = decentraleyes.getLocalTarget(url.hostname, url.pathname);
+    if (obj) {
+      if (validate(obj.path)) {
+        let redirectUrl = chrome.runtime.getURL('data/' + obj.path);
+        // redirect even if tab is not found
+        if (cache[d.tabId]) {
+          cache[d.tabId].push({
+            hostname: url.hostname,
+            pathname: url.pathname
+          });
+          app.emit('update-badge', d.tabId);
+        }
+        else {
+          console.error('resource is redirected but no tab is found');
+        }
+        return {
+          redirectUrl
+        };
+      }
+      else {
+        console.error('resource not found', d.url,  obj.path);
+      }
+    }
+    return {};
+  }, filter, ['blocking']);
+});
+// resetting toolbar badge
+chrome.webRequest.onBeforeRequest.addListener(d => {
+  if (cache[d.tabId]) {
+    cache[d.tabId] = [];
+    app.emit('update-badge', d.tabId);
+  }
+}, {
+  urls: ['<all_urls>'],
+  types: ['main_frame']
+}, []);
+
+// badge
+chrome.tabs.query({}, tabs => tabs.forEach(t => cache[t.id] = []));
+app.on('update-badge', (tabId) => {
+  if (!cache[tabId]) {
+    return;
+  }
+  chrome.browserAction.setBadgeText({
+    tabId,
+    text: (cache[tabId].length || '') + ''
+  });
+  let title = cache[tabId].map((o, i) => (i + 1) + '. ' + o.hostname + ' -> ' + o.pathname.split('/').pop()).join('\n');
+  title = 'Local CDN' + (title ? '\n\n' + title : '');
+  chrome.browserAction.setTitle({
+    tabId,
+    title
+  });
+});
+chrome.tabs.onCreated.addListener((tab) => cache[tab.id] = []);
+// cleanup
+chrome.tabs.onRemoved.addListener((tabId) => delete cache[tabId]);
+// FAQs
+chrome.storage.local.get('version', (obj) => {
+  let version = chrome.runtime.getManifest().version;
+  if (obj.version !== version) {
+    chrome.storage.local.set({version}, () => {
+      chrome.tabs.create({
+        url: 'http://add0n.com/local-cdn.html?version=' + version + '&type=' +
+          (obj.version ? ('upgrade&p=' + obj.version) : 'install')
+      });
+    });
+  }
+});