Add command line flag to override campaigns.

The value is based64 encoded string. Also expose it as chrome flag.

Bug: b/333140151
Change-Id: I6025d346bf57bd4dd17440a5e6fcfe47eff8d666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5431446
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Li Lin <llin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1284128}

ash/constants/ash_switches.cc

@@ -712,6 +712,9 @@ const char kGlanceablesKeyExpectedHash[] =
     "\xe2\xcb";
 const char kGlanceablesKeySwitch[] = "glanceables-key";
 
+// Specifies campaigns to override for testing.
+const char kGrowthCampaigns[] = "growth-campaigns";
+
 // Path for which to load growth campaigns file for testing (instead of
 // downloading from Omaha).
 const char kGrowthCampaignsPath[] = "growth-campaigns-path";

ash/constants/ash_switches.h

@@ -228,6 +228,7 @@ COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kForestFeatureKey[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kFormFactor[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGlanceablesKeyExpectedHash[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGlanceablesKeySwitch[];
+COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGrowthCampaigns[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGrowthCampaignsPath[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGuestSession[];
 COMPONENT_EXPORT(ASH_CONSTANTS) extern const char kGuestWallpaperLarge[];

chrome/browser/about_flags.cc

@@ -3156,6 +3156,8 @@ constexpr char kClipboardHistoryUrlTitlesInternalName[] =
 constexpr char kBluetoothUseFlossInternalName[] = "bluetooth-use-floss";
 constexpr char kSeaPenInternalName[] = "sea-pen";
 constexpr char kAssistantIphInternalName[] = "assistant-iph";
+constexpr char kGrowthCampaigns[] = "growth-campaigns";
+constexpr char kGrowthCampaignsTestTag[] = "campaigns-test-tag";
 #endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 #if !BUILDFLAG(IS_ANDROID) && BUILDFLAG(GOOGLE_CHROME_BRANDING)
@@ -9339,11 +9341,15 @@ const FeatureEntry kFeatureEntries[] = {
      SINGLE_VALUE_TYPE_AND_VALUE(switches::kComponentUpdater,
                                  component_updater::kSwitchTestRequestParam)},
 
-    {"campaigns-test-tag",
+    {kGrowthCampaignsTestTag,
      flag_descriptions::kCampaignsComponentUpdaterTestTagName,
      flag_descriptions::kCampaignsComponentUpdaterTestTagDescription, kOsCrOS,
      STRING_VALUE_TYPE(switches::kCampaignsTestTag, "")},
 
+    {kGrowthCampaigns, flag_descriptions::kCampaignsOverrideName,
+     flag_descriptions::kCampaignsOverrideDescription, kOsCrOS,
+     STRING_VALUE_TYPE(ash::switches::kGrowthCampaigns, "")},
+
     {"demo-mode-test-tag",
      flag_descriptions::kDemoModeComponentUpdaterTestTagName,
      flag_descriptions::kDemoModeComponentUpdaterTestTagDescription, kOsCrOS,
@@ -11453,6 +11459,24 @@ bool ShouldSkipConditionalFeatureEntry(const flags_ui::FlagsStorage* storage,
            channel != version_info::Channel::CANARY &&
            channel != version_info::Channel::UNKNOWN;
   }
+
+  // Only show Growth campaigns flag if channel is one of Beta/Dev/Canary/
+  // Unknown.
+  if (!strcmp(kGrowthCampaigns, entry.internal_name)) {
+    return channel != version_info::Channel::BETA &&
+           channel != version_info::Channel::DEV &&
+           channel != version_info::Channel::CANARY &&
+           channel != version_info::Channel::UNKNOWN;
+  }
+
+  // Only show Growth campaigns test tag flag if channel is one of
+  // Beta/Dev/Canary/ Unknown.
+  if (!strcmp(kGrowthCampaignsTestTag, entry.internal_name)) {
+    return channel != version_info::Channel::BETA &&
+           channel != version_info::Channel::DEV &&
+           channel != version_info::Channel::CANARY &&
+           channel != version_info::Channel::UNKNOWN;
+  }
 #endif  // BUILDFLAG(IS_CHROMEOS_ASH)
   if (flags::IsFlagExpired(storage, entry.internal_name)) {
     return true;

chrome/browser/flag-metadata.json

@@ -4707,6 +4707,11 @@
     "owners": [ "ckitagawa@google.com", "clank-isochron-team@google.com" ],
     "expiry_milestone": 125
   },
+  {
+    "name": "growth-campaigns",
+    "owners": [ "llin@google.com", "cros-growth@google.com" ],
+    "expiry_milestone": 130
+  },
   {
     "name": "handwriting-legacy-recognition",
     "owners": [ "curtismcmullan@chromium.org", "essential-inputs-team@google.com" ],

chrome/browser/flag_descriptions.cc

@@ -5918,6 +5918,9 @@ const char kCampaignsComponentUpdaterTestTagName[] = "Campaigns test tag";
 const char kCampaignsComponentUpdaterTestTagDescription[] =
     "Tags used for component updater to selet Omaha cohort for Growth "
     "Campaigns.";
+const char kCampaignsOverrideName[] = "Campaigns override";
+const char kCampaignsOverrideDescription[] =
+    "Base64 encoded Growth campaigns used for testing.";
 #endif  // IS_CHROMEOS_ASH
 
 const char kComponentUpdaterTestRequestName[] =

chrome/browser/flag_descriptions.h

@@ -103,6 +103,8 @@ extern const char kBackgroundResourceFetchDescription[];
 #if BUILDFLAG(IS_CHROMEOS_ASH)
 extern const char kCampaignsComponentUpdaterTestTagName[];
 extern const char kCampaignsComponentUpdaterTestTagDescription[];
+extern const char kCampaignsOverrideName[];
+extern const char kCampaignsOverrideDescription[];
 #endif  // IS_CHROMEOS_ASH
 
 extern const char kCOLRV1FontsDescription[];

chromeos/ash/components/growth/campaigns_manager.cc

@@ -6,6 +6,9 @@
 
 #include <optional>
 
+#include "ash/constants/ash_switches.h"
+#include "base/base64.h"
+#include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/json/json_reader.h"
@@ -32,6 +35,18 @@ inline constexpr char kEventKey[] = "event_to_be_cleared";
 inline constexpr char kEventTemplate[] =
     "name:%s;comparator:any;window:365;storage:365";
 
+std::optional<base::Value::Dict> ParseCampaignsFile(
+    const std::string& campaigns_data) {
+  std::optional<base::Value> value(base::JSONReader::Read(campaigns_data));
+  if (!value || !value->is_dict()) {
+    LOG(ERROR) << "Failed to parse campaigns file: " << campaigns_data;
+    RecordCampaignsManagerError(CampaignsManagerError::kCampaignsParsingFail);
+    return std::nullopt;
+  }
+
+  return std::move(value->GetDict());
+}
+
 std::optional<base::Value::Dict> ReadCampaignsFile(
     const base::FilePath& campaigns_component_path) {
   const auto campaigns_load_start_time = base::TimeTicks::Now();
@@ -47,18 +62,11 @@ std::optional<base::Value::Dict> ReadCampaignsFile(
     return std::nullopt;
   }
 
-  std::optional<base::Value> value(base::JSONReader::Read(campaigns_data));
-  if (!value || !value->is_dict()) {
-    LOG(ERROR) << "Failed to parse campaigns file.";
-    RecordCampaignsManagerError(CampaignsManagerError::kCampaignsParsingFail);
-    RecordCampaignsComponentReadDuration(base::TimeTicks::Now() -
-                                         campaigns_load_start_time);
-    return std::nullopt;
-  }
+  auto parse_result = ParseCampaignsFile(campaigns_data);
 
   RecordCampaignsComponentReadDuration(base::TimeTicks::Now() -
                                        campaigns_load_start_time);
-  return std::move(value->GetDict());
+  return parse_result;
 }
 
 void LogCampaignInSystemLog(const Campaign* campaign, Slot slot) {
@@ -132,6 +140,20 @@ void CampaignsManager::SetPrefs(PrefService* prefs) {
 
 void CampaignsManager::LoadCampaigns(base::OnceClosure load_callback,
                                      bool in_oobe) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(ash::switches::kGrowthCampaigns)) {
+    const auto& value =
+        command_line->GetSwitchValueASCII(ash::switches::kGrowthCampaigns);
+    std::string decoded_str;
+    if (base::Base64Decode(value, &decoded_str)) {
+      OnCampaignsLoaded(std::move(load_callback),
+                        ParseCampaignsFile(decoded_str));
+      return;
+    } else {
+      LOG(ERROR) << "Failed decode base64 encoded campaigns string.";
+    }
+  }
+
   campaigns_download_start_time_ = base::TimeTicks::Now();
   client_->LoadCampaignsComponent(base::BindOnce(
       &CampaignsManager::OnCampaignsComponentLoaded, weak_factory_.GetWeakPtr(),