[Video Tutorials] Configs.

- Setup video tutorial config class.
- Add default preferred language and server endpoint configs.
- Add unit test for config.

Change-Id: I9f71a85070e34e0d85b2d00d5e6dcec582240056
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393940
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806952}

chrome/browser/video_tutorials/internal/BUILD.gn

@@ -9,6 +9,8 @@ if (is_android) {
 
 source_set("internal") {
   sources = [
+    "config.cc",
+    "config.h",
     "proto_conversions.cc",
     "proto_conversions.h",
     "store.h",
@@ -80,6 +82,7 @@ source_set("unit_tests") {
   testonly = true
 
   sources = [
+    "config_unittest.cc",
     "proto_conversions_unittest.cc",
     "tutorial_group_unittest.cc",
     "tutorial_store_unittest.cc",
@@ -89,6 +92,7 @@ source_set("unit_tests") {
     ":internal",
     "//base",
     "//base/test:test_support",
+    "//chrome/browser/video_tutorials:public",
     "//chrome/browser/video_tutorials/proto",
     "//chrome/browser/video_tutorials/test:test_lib",
     "//components/leveldb_proto",

chrome/browser/video_tutorials/internal/config.cc

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/video_tutorials/internal/config.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial_params.h"
+#include "chrome/browser/video_tutorials/switches.h"
+
+namespace video_tutorials {
+
+// Default base URL string for the server.
+constexpr char kDefaultBaseURL[] = "https://chromeupboarding-pa.googleapis.com";
+
+// Default URL string for GetTutorials RPC.
+constexpr char kDefaultGetTutorialsPath[] = "/v1/videotutorials";
+
+// Hindi is the default language.
+constexpr char kDefaultPreferredLanguage[] = "hi";
+
+// Finch parameter key for base server URL to retrieve the tutorials.
+constexpr char kBaseURLKey[] = "base_url";
+
+constexpr char kPrefferedLanguageKey[] = "default_lang";
+
+namespace {
+const GURL BuildGetTutorialsEndpoint(const GURL& base_url, const char* path) {
+  GURL::Replacements replacements;
+  replacements.SetPathStr(path);
+  return base_url.ReplaceComponents(replacements);
+}
+
+}  // namespace
+
+// static
+GURL Config::GetTutorialsServerURL() {
+  std::string base_url_from_finch = base::GetFieldTrialParamValueByFeature(
+      features::kVideoTutorials, kBaseURLKey);
+  GURL server_url = base_url_from_finch.empty() ? GURL(kDefaultBaseURL)
+                                                : GURL(base_url_from_finch);
+  return BuildGetTutorialsEndpoint(server_url, kDefaultGetTutorialsPath);
+}
+
+// static
+std::string Config::GetDefaultPreferredLanguage() {
+  std::string default_lang_from_finch = base::GetFieldTrialParamValueByFeature(
+      features::kVideoTutorials, kPrefferedLanguageKey);
+  return default_lang_from_finch.empty() ? kDefaultPreferredLanguage
+                                         : default_lang_from_finch;
+}
+
+}  // namespace video_tutorials

chrome/browser/video_tutorials/internal/config.h

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_VIDEO_TUTORIALS_INTERNAL_CONFIG_H_
+#define CHROME_BROWSER_VIDEO_TUTORIALS_INTERNAL_CONFIG_H_
+
+#include <memory>
+#include <string>
+
+#include "url/gurl.h"
+
+namespace video_tutorials {
+
+// Default URL string for GetVideoTutorials RPC.
+extern const char kDefaultGetTutorialsPath[];
+
+// Default base URL string.
+extern const char kDefaultBaseURL[];
+
+// Finch parameter key for base server URL to retrieve the tutorials.
+extern const char kBaseURLKey[];
+
+// Finch parameter key for the default preferred language.
+extern const char kPrefferedLanguageKey[];
+
+// Default preferred language setting before users pick.
+extern const char kDefaultPreferredLanguage[];
+
+class Config {
+ public:
+  // Get video tutorials metadata server URL.
+  static GURL GetTutorialsServerURL();
+
+  // Get the default language before users choice.
+  static std::string GetDefaultPreferredLanguage();
+};
+
+}  // namespace video_tutorials
+
+#endif  // CHROME_BROWSER_VIDEO_TUTORIALS_INTERNAL_CONFIG_H_

chrome/browser/video_tutorials/internal/config_unittest.cc

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/video_tutorials/internal/config.h"
+
+#include <map>
+#include <string>
+
+#include "base/test/scoped_feature_list.h"
+#include "chrome/browser/video_tutorials/switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace video_tutorials {
+
+TEST(VideoTutorialsConfigTest, FinchConfigEnabled) {
+  base::test::ScopedFeatureList feature_list;
+  std::map<std::string, std::string> params = {
+      {kBaseURLKey, "https://test.com"}, {kPrefferedLanguageKey, "en"}};
+  feature_list.InitAndEnableFeatureWithParameters(features::kVideoTutorials,
+                                                  params);
+
+  EXPECT_EQ(Config::GetTutorialsServerURL().spec(),
+            "https://test.com/v1/videotutorials");
+  EXPECT_EQ(Config::GetDefaultPreferredLanguage(), "en");
+}
+
+TEST(VideoTutorialsConfigTest, ConfigDefaultParams) {
+  base::test::ScopedFeatureList feature_list;
+  feature_list.InitAndEnableFeature(features::kVideoTutorials);
+  EXPECT_EQ(Config::GetTutorialsServerURL().spec(),
+            "https://chromeupboarding-pa.googleapis.com/v1/videotutorials");
+  EXPECT_EQ(Config::GetDefaultPreferredLanguage(), "hi");
+}
+
+}  // namespace video_tutorials