Issue 6391 - Allow running the browser unit tests with Firefox

test/runners/firefox_download.js

Index: test/runners/firefox_download.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/test/runners/firefox_download.js
@@ -0,0 +1,183 @@
+/*
+ * 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 {exec} = require("child_process");
+const fs = require("fs");
+const path = require("path");
+
+const {ncp} = require("ncp");
+
+const {download} = require("./download");
+
+const {platform} = process;
+
+// macOS specific
+const dmg = platform == "darwin" ? require("dmg") : null;
+
+function extractTar(archive, browserDir)
+{
+  return new Promise((resolve, reject) =>
+  {
+    fs.mkdirSync(browserDir);
+    exec(["tar", "-jxf", archive, "-C", browserDir].join(" "),
+         err =>
+         {
+           if (err)
+             reject(err);
+           else
+             resolve();
+         });
+  });
+}
+
+function extractDmg(archive, browserDir)
+{
+  return new Promise((resolve, reject) =>
+  {
+    dmg.mount(archive, (err, mpath) =>
+    {
+      if (err)
+        reject(err);
+      else
+      {
+        let files = fs.readdirSync(mpath);
+        let target = files.find(file => /\.app/.test(file));
+        let source = path.join(mpath, target);
+        fs.mkdirSync(browserDir);
+        ncp(source, path.join(browserDir, target), ncperr =>
+        {
+          dmg.unmount(mpath, dmgerr =>
+          {
+            if (dmgerr)
+              console.error(`Error unmounting DMG: ${dmgerr}`);
+          });
+          if (ncperr)
+          {
+            console.error(`Error copying ${source} to ${browserDir}`);
+            reject(ncperr);
+          }
+          else
+            resolve();
+        });
+      }
+    });
+  });
+}
+
+function runWinInstaller(archive, browserDir)
+{
+  // Procedure inspired from mozinstall:
+  // https://hg.mozilla.org/mozilla-central/file/tip/testing/mozbase/mozinstall/mozinstall/mozinstall.py
+  // Also uninstaller will need to be run.
+  return new Promise((resolve, reject) =>
+  {
+    exec([archive, `/extractdir=${browserDir}`].join(" "),
+         err =>
+         {
+           if (err)
+             reject(err);
+           else
+             resolve();
+         });
+  });
+}
+
+function extractArchive(archive, browserDir)
+{
+  switch (platform)
+  {
+    case "win32":
+      return runWinInstaller(archive, browserDir);
+    case "linux":
+      return extractTar(archive, browserDir);
+    case "darwin":
+      return extractDmg(archive, browserDir);
+    default:
+      throw new Error("Unexpected platform");
+  }
+}
+
+function getFirefoxExecutable(browserDir)
+{
+  switch (platform)
+  {
+    case "win32":
+      return path.join(browserDir, "firefox.exe");
+    case "linux":
+      return path.join(browserDir, "firefox", "firefox");
+    case "darwin":
+      return path.join(browserDir, "Firefox.app", "Contents",
+                       "MacOS", "firefox");
+    default:
+      throw new Error("Unexpected platform");
+  }
+}
+
+function ensureFirefox(firefoxVersion)
+{
+  let targetPlatform = platform;
+  if (platform == "win32")
+    targetPlatform += "-" + process.arch;
+  let buildTypes = {
+    "win32-ia32": ["win32-EME-free", `Firefox Setup ${firefoxVersion}.exe`],
+    "win32-x64": ["win64-EME-free", `Firefox Setup ${firefoxVersion}.exe`],
+    "linux": ["linux-x86_64", `firefox-${firefoxVersion}.tar.bz2`],
+    "darwin": ["mac-EME-free", `Firefox ${firefoxVersion}.dmg`]
+  };
+
+  if (!buildTypes.hasOwnProperty(targetPlatform))
+  {
+    let err = new Error(`Cannot run browser tests, ${targetPlatform} is unsupported`);
+    return Promise.reject(err);
+  }
+
+  return Promise.resolve().then(() =>
+  {
+    let snapshotsDir = path.join(__dirname, "..", "..", "firefox-snapshots");
+    let browserDir = path.join(snapshotsDir,
+                                `firefox-${targetPlatform}-${firefoxVersion}`);
+    if (fs.existsSync(browserDir))
+      return browserDir;
+
+    if (!fs.existsSync(path.dirname(browserDir)))
+      fs.mkdirSync(path.dirname(browserDir));
+
+    let [buildPlatform, fileName] = buildTypes[targetPlatform];
+    let archive = path.join(snapshotsDir, "download-cache", fileName);
+
+    return Promise.resolve()
+      .then(() =>
+      {
+        if (!fs.existsSync(archive))
+        {
+          let url = `https://archive.mozilla.org/pub/firefox/releases/${firefoxVersion}/${buildPlatform}/en-US/${fileName}`;
+          console.info("Downloading Firefox...");
+          return download(url, archive);
+        }
+        console.info(`Reusing cached archive ${archive}`);
+      })
+      .then(() => extractArchive(archive, browserDir))
+      .then(() => browserDir);
+  }).then(dir => getFirefoxExecutable(dir));
+}
+
+module.exports.ensureFirefox = ensureFirefox;