Adding firefox_installer.dart (flutter/engine#13185)

* adding firefox downloading functionality to felt

* Getting the location directly from the response

engine/src/flutter/lib/web_ui/dev/chrome_installer.dart

@@ -44,14 +44,14 @@ void addChromeVersionOption(ArgParser argParser) {
 /// exact build nuber, such as 695653. Build numbers can be found here:
 ///
 /// https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Linux_x64/
-Future<ChromeInstallation> getOrInstallChrome(
+Future<BrowserInstallation> getOrInstallChrome(
   String requestedVersion, {
   StringSink infoLog,
 }) async {
   infoLog ??= io.stdout;
 
   if (requestedVersion == 'system') {
-    return ChromeInstallation(
+    return BrowserInstallation(
       version: 'system',
       executable: await _findSystemChromeExecutable(),
     );
@@ -69,7 +69,7 @@ Future<ChromeInstallation> getOrInstallChrome(
     } else {
       infoLog.writeln('Installing Chrome version: ${installer.version}');
       await installer.install();
-      final ChromeInstallation installation = installer.getInstallation();
+      final BrowserInstallation installation = installer.getInstallation();
       infoLog.writeln(
           'Installations complete. To launch it run ${installation.executable}');
     }
@@ -91,19 +91,6 @@ Future<String> _findSystemChromeExecutable() async {
   return which.stdout;
 }
 
-class ChromeInstallation {
-  const ChromeInstallation({
-    @required this.version,
-    @required this.executable,
-  });
-
-  /// Chrome version.
-  final String version;
-
-  /// Path the the Chrome executable.
-  final String executable;
-}
-
 /// Manages the installation of a particular [version] of Chrome.
 class ChromeInstaller {
   factory ChromeInstaller({
@@ -157,12 +144,12 @@ class ChromeInstaller {
     return versionDir.existsSync();
   }
 
-  ChromeInstallation getInstallation() {
+  BrowserInstallation getInstallation() {
     if (!isInstalled) {
       return null;
     }
 
-    return ChromeInstallation(
+    return BrowserInstallation(
       version: version,
       executable: PlatformBinding.instance.getChromeExecutablePath(versionDir),
     );

engine/src/flutter/lib/web_ui/dev/common.dart

@@ -4,6 +4,7 @@
 
 import 'dart:io' as io;
 
+import 'package:meta/meta.dart';
 import 'package:path/path.dart' as path;
 import 'package:yaml/yaml.dart';
 
@@ -34,7 +35,10 @@ abstract class PlatformBinding {
 
   int getChromeBuild(YamlMap chromeLock);
   String getChromeDownloadUrl(String version);
+  String getFirefoxDownloadUrl(String version);
   String getChromeExecutablePath(io.Directory versionDir);
+  String getFirefoxExecutablePath(io.Directory versionDir);
+  String getFirefoxLatestVersionUrl();
 }
 
 const String _kBaseDownloadUrl =
@@ -54,6 +58,22 @@ class _LinuxBinding implements PlatformBinding {
   @override
   String getChromeExecutablePath(io.Directory versionDir) =>
       path.join(versionDir.path, 'chrome-linux', 'chrome');
+
+  @override
+  String getFirefoxDownloadUrl(String version) {
+    return 'https://download-installer.cdn.mozilla.net/pub/firefox/releases/${version}/linux-x86_64/en-US/firefox-${version}.tar.bz2';
+  }
+
+  @override
+  String getFirefoxExecutablePath(io.Directory versionDir) {
+    // TODO: implement getFirefoxExecutablePath
+    return null;
+  }
+
+  @override
+  String getFirefoxLatestVersionUrl() {
+    return 'https://download.mozilla.org/?product=firefox-latest&os=linux64&lang=en-US';
+  }
 }
 
 class _MacBinding implements PlatformBinding {
@@ -75,4 +95,34 @@ class _MacBinding implements PlatformBinding {
       'Contents',
       'MacOS',
       'Chromium');
+
+  @override
+  String getFirefoxDownloadUrl(String version) {
+    // TODO: implement getFirefoxDownloadUrl
+    return null;
+  }
+
+  @override
+  String getFirefoxExecutablePath(io.Directory versionDir) {
+    // TODO: implement getFirefoxExecutablePath
+    return null;
+  }
+
+  @override
+  String getFirefoxLatestVersionUrl() {
+    return 'https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US';
+  }
+}
+
+class BrowserInstallation {
+  const BrowserInstallation({
+    @required this.version,
+    @required this.executable,
+  });
+
+  /// Browser version.
+  final String version;
+
+  /// Path the the browser executable.
+  final String executable;
 }

engine/src/flutter/lib/web_ui/dev/firefox_installer.dart

@@ -0,0 +1,129 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+import 'dart:io' as io;
+
+import 'package:http/http.dart';
+import 'package:meta/meta.dart';
+import 'package:path/path.dart' as path;
+
+import 'common.dart';
+import 'environment.dart';
+
+/// Manages the installation of a particular [version] of Firefox.
+class FirefoxInstaller {
+  factory FirefoxInstaller({
+    @required String version,
+  }) {
+    if (version == 'system') {
+      throw BrowserInstallerException(
+          'Cannot install system version of Firefox. System Firefox must be installed manually.');
+    }
+    if (version == 'latest') {
+      throw BrowserInstallerException(
+          'Expected a concrete Firefox version, but got $version. Maybe use FirefoxInstaller.latest()?');
+    }
+    final io.Directory firefoxInstallationDir = io.Directory(
+      path.join(environment.webUiDartToolDir.path, 'firefox'),
+    );
+    final io.Directory versionDir = io.Directory(
+      path.join(firefoxInstallationDir.path, version),
+    );
+    return FirefoxInstaller._(
+      version: version,
+      firefoxInstallationDir: firefoxInstallationDir,
+      versionDir: versionDir,
+    );
+  }
+
+  static Future<FirefoxInstaller> latest() async {
+    final String latestVersion = await fetchLatestFirefoxVersion();
+    return FirefoxInstaller(version: latestVersion);
+  }
+
+  FirefoxInstaller._({
+    @required this.version,
+    @required this.firefoxInstallationDir,
+    @required this.versionDir,
+  });
+
+  /// Firefox version managed by this installer.
+  final String version;
+
+  /// HTTP client used to download Firefox.
+  final Client client = Client();
+
+  /// Root directory that contains Chrome versions.
+  final io.Directory firefoxInstallationDir;
+
+  /// Installation directory for Firefox of the requested [version].
+  final io.Directory versionDir;
+
+  bool get isInstalled {
+    return versionDir.existsSync();
+  }
+
+  BrowserInstallation getInstallation() {
+    if (!isInstalled) {
+      return null;
+    }
+
+    return BrowserInstallation(
+      version: version,
+      executable: PlatformBinding.instance.getFirefoxExecutablePath(versionDir),
+    );
+  }
+
+  /// Install the browser by downloading from the web.
+  Future<void> install() async {
+    final io.File downloadedFile = await _download();
+    await _uncompress(downloadedFile);
+    downloadedFile.deleteSync();
+  }
+
+  /// Downloads the browser version from web.
+  /// See [version].
+  Future<io.File> _download() async {
+    if (versionDir.existsSync()) {
+      versionDir.deleteSync(recursive: true);
+    }
+
+    versionDir.createSync(recursive: true);
+    final String url = PlatformBinding.instance.getFirefoxDownloadUrl(version);
+    final StreamedResponse download = await client.send(Request(
+      'GET',
+      Uri.parse(url),
+    ));
+
+    final io.File downloadedFile =
+        io.File(path.join(versionDir.path, 'firefox.zip'));
+    await download.stream.pipe(downloadedFile.openWrite());
+
+    return downloadedFile;
+  }
+
+  /// Uncompress the downloaded browser files.
+  /// See [version].
+  Future<void> _uncompress(io.File downloadedFile) async {
+    /// TODO(nturgut): Implement Install.
+  }
+
+  void close() {
+    client.close();
+  }
+}
+
+/// Fetches the latest available Chrome build version.
+Future<String> fetchLatestFirefoxVersion() async {
+  final RegExp forFirefoxVersion = RegExp("firefox-[0-9.]\+[0-9]");
+  final io.HttpClientRequest request = await io.HttpClient()
+      .getUrl(Uri.parse(PlatformBinding.instance.getFirefoxLatestVersionUrl()));
+  request.followRedirects = false;
+  // We will parse the HttpHeaders to find the redirect location.
+  final io.HttpClientResponse response = await request.close();
+
+  final String location = response.headers.value('location');
+  final String version = forFirefoxVersion.stringMatch(location);
+
+  return version.substring(version.lastIndexOf('-') + 1);
+}

engine/src/flutter/lib/web_ui/dev/test_platform.dart

@@ -41,6 +41,7 @@ import 'package:webkit_inspection_protocol/webkit_inspection_protocol.dart'
     as wip;
 
 import 'chrome_installer.dart';
+import 'common.dart';
 import 'environment.dart' as env;
 import 'goldens.dart';
 
@@ -992,7 +993,7 @@ class Chrome extends Browser {
     assert(version != null);
     var remoteDebuggerCompleter = Completer<Uri>.sync();
     return Chrome._(() async {
-      final ChromeInstallation installation = await getOrInstallChrome(
+      final BrowserInstallation installation = await getOrInstallChrome(
         version,
         infoLog: isCirrus ? stdout : _DevNull(),
       );