Issue 6391 - Allow running the browser unit tests with Firefox

test/runners/chromium_download.js

Index: test/runners/chromium_download.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/test/runners/chromium_download.js
@@ -0,0 +1,146 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* eslint-env node */
+/* eslint no-console: "off" */
+
+"use strict";
+
+const fs = require("fs");
+const https = require("https");
+const path = require("path");
+
+const extractZip = require("extract-zip");
+
+function getChromiumExecutable(chromiumDir)
+{
+  switch (process.platform)
+  {
+    case "win32":
+      return path.join(chromiumDir, "chrome-win32", "chrome.exe");
+    case "linux":
+      return path.join(chromiumDir, "chrome-linux", "chrome");
+    case "darwin":
+      return path.join(chromiumDir, "chrome-mac", "Chromium.app", "Contents",
+                       "MacOS", "Chromium");
+    default:
+      throw new Error("Unexpected platform");
+  }
+}
+
+function ensureChromium(chromiumRevision)
+{
+  let {platform} = process;
+  if (platform == "win32")
+    platform += "-" + process.arch;
+  let buildTypes = {
+    "win32-ia32": ["Win", "chrome-win32.zip"],
+    "win32-x64": ["Win_x64", "chrome-win32.zip"],
+    "linux": ["Linux_x64", "chrome-linux.zip"],
+    "darwin": ["Mac", "chrome-mac.zip"]
+  };
+
+  if (!buildTypes.hasOwnProperty(platform))
+  {
+    let err = new Error(`Cannot run browser tests, ${platform} is unsupported`);
+    return Promise.reject(err);
+  }
+
+
+  return Promise.resolve().then(() =>
+  {
+    let snapshotsDir = path.join(__dirname, "..", "..", "chromium-snapshots");
+    let chromiumDir = path.join(snapshotsDir,
+                                `chromium-${platform}-${chromiumRevision}`);
+    if (fs.existsSync(chromiumDir))
+      return chromiumDir;
+
+    if (!fs.existsSync(path.dirname(chromiumDir)))
+      fs.mkdirSync(path.dirname(chromiumDir));
+
+    let [dir, fileName] = buildTypes[platform];
+    let archive = path.join(snapshotsDir, "download-cache",
+                            `${chromiumRevision}-${fileName}`);
+
+    return Promise.resolve()
+      .then(() =>
+      {
+        if (!fs.existsSync(archive))
+        {
+          let url = `https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/${dir}%2F${chromiumRevision}%2F${fileName}?alt=media`;
+          console.info("Downloading Chromium...");
+          return download(url, archive);
+        }
+        console.info(`Reusing cached archive ${archive}`);
+      })
+      .then(() => unzipArchive(archive, chromiumDir))
+      .then(() => chromiumDir);
+  }).then(dir => getChromiumExecutable(dir));
+}
+
+function download(url, destFile)
+{
+  return new Promise((resolve, reject) =>
+  {
+    let cacheDir = path.dirname(destFile);
+    if (!fs.existsSync(cacheDir))
+      fs.mkdirSync(cacheDir);
+    let tempDest = destFile + "-" + process.pid;
+    let writable = fs.createWriteStream(tempDest);
+
+    https.get(url, response =>
+    {
+      if (response.statusCode != 200)
+      {
+        reject(
+          new Error(`Unexpected server response: ${response.statusCode}`));
+        response.resume();
+        return;
+      }
+
+      response.pipe(writable)
+              .on("error", error =>
+              {
+                writable.close();
+                fs.unlinkSync(tempDest);
+                reject(error);
+              })
+              .on("close", () =>
+              {
+                writable.close();
+                fs.renameSync(tempDest, destFile);
+                resolve();
+              });
+    }).on("error", reject);
+  });
+}
+
+function unzipArchive(archive, destDir)
+{
+  return new Promise((resolve, reject) =>
+  {
+    extractZip(archive, {dir: destDir}, err =>
+    {
+      if (err)
+        reject(err);
+      else
+        resolve();
+    });
+  });
+}
+
+module.exports.ensureChromium = ensureChromium;