Close #27023: Add capability to override telemetry URL

app/src/main/java/org/mozilla/fenix/FenixApplication.kt

@@ -75,6 +75,8 @@ import org.mozilla.fenix.components.metrics.MetricServiceType
 import org.mozilla.fenix.components.metrics.MozillaProductDetector
 import org.mozilla.fenix.components.toolbar.ToolbarPosition
 import org.mozilla.fenix.ext.containsQueryParameters
+import org.mozilla.fenix.ext.getCustomGleanServerUrlIfAvailable
+import org.mozilla.fenix.ext.setCustomEndpointIfAvailable
 import org.mozilla.fenix.ext.isCustomEngine
 import org.mozilla.fenix.ext.isKnownSearchDomain
 import org.mozilla.fenix.ext.settings
@@ -154,14 +156,24 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
 
         logger.debug("Initializing Glean (uploadEnabled=$telemetryEnabled})")
 
+        // for performance reasons, this is only available in Nightly or Debug builds
+        val customEndpoint = if (Config.channel.isNightlyOrDebug) {
+            // for testing, if custom glean server url is set in the secret menu, use it to initialize Glean
+            getCustomGleanServerUrlIfAvailable(this)
+        } else {
+            null
+        }
+
+        val configuration = Configuration(
+            channel = BuildConfig.BUILD_TYPE,
+            httpClient = ConceptFetchHttpUploader(
+                lazy(LazyThreadSafetyMode.NONE) { components.core.client },
+            ),
+        )
+
         Glean.initialize(
             applicationContext = this,
-            configuration = Configuration(
-                channel = BuildConfig.BUILD_TYPE,
-                httpClient = ConceptFetchHttpUploader(
-                    lazy(LazyThreadSafetyMode.NONE) { components.core.client },
-                ),
-            ),
+            configuration = configuration.setCustomEndpointIfAvailable(customEndpoint),
             uploadEnabled = telemetryEnabled,
             buildInfo = GleanBuildInfo.buildInfo,
         )

app/src/main/java/org/mozilla/fenix/ext/Configuration.kt

@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.ext
+
+import android.content.Context
+import androidx.preference.PreferenceManager
+import mozilla.components.service.glean.config.Configuration
+import org.mozilla.fenix.R
+
+/**
+ * Get custom Glean server URL if available.
+ */
+fun getCustomGleanServerUrlIfAvailable(context: Context): String? {
+    return PreferenceManager.getDefaultSharedPreferences(context).getString(
+        context.getPreferenceKey(R.string.pref_key_custom_glean_server_url),
+        null,
+    )
+}
+
+/**
+ * Applies the custom Glean server URL to the Configuration if available.
+ */
+fun Configuration.setCustomEndpointIfAvailable(serverEndpoint: String?): Configuration {
+    if (!serverEndpoint.isNullOrEmpty()) {
+        return copy(serverEndpoint = serverEndpoint)
+    }
+
+    return this
+}

app/src/main/java/org/mozilla/fenix/settings/SecretSettingsFragment.kt

@@ -5,9 +5,11 @@
 package org.mozilla.fenix.settings
 
 import android.os.Bundle
+import androidx.preference.EditTextPreference
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreference
+import org.mozilla.fenix.Config
 import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.R
 import org.mozilla.fenix.ext.components
@@ -53,5 +55,10 @@ class SecretSettingsFragment : PreferenceFragmentCompat() {
             isChecked = context.settings().showUnifiedSearchFeature
             onPreferenceChangeListener = SharedPreferenceUpdater()
         }
+
+        // for performance reasons, this is only available in Nightly or Debug builds
+        requirePreference<EditTextPreference>(R.string.pref_key_custom_glean_server_url).apply {
+            isVisible = Config.channel.isNightlyOrDebug
+        }
     }
 }

app/src/main/res/values/preference_keys.xml

@@ -307,4 +307,5 @@
     <string name="pref_key_nimbus_use_preview" translatable="false">pref_key_nimbus_use_preview</string>
     <string name="pref_key_history_metadata_feature" translatable="false">pref_key_history_metadata_feature</string>
     <string name="pref_key_show_unified_search" translatable="false">pref_key_show_unified_search</string>
+    <string name="pref_key_custom_glean_server_url" translatable="false">pref_key_custom_glean_server_url</string>
 </resources>

app/src/main/res/values/static_strings.xml

@@ -44,6 +44,8 @@
     <string name="preferences_debug_settings_task_continuity" translatable="false">Enable Task Continuity</string>
     <!-- Label for enabling the Unified Search feature -->
     <string name="preferences_debug_settings_unified_search" translatable="false">Enable Unified Search (requires restart)</string>
+    <!-- Label for custom Glean server URL -->
+    <string name="preferences_debug_settings_custom_glean_server_url" translatable="false">Custom Glean server URL (requires restart)</string>
     <!-- Title of preference for sync debugging (only shown in the when the secret debug menu is enabled) -->
     <string name="preferences_sync_debug">Sync Debug</string>
     <!-- Preference to override the Push server -->

app/src/main/res/xml/secret_settings_preferences.xml

@@ -25,4 +25,10 @@
         android:key="@string/pref_key_show_unified_search"
         android:title="@string/preferences_debug_settings_unified_search"
         app:iconSpaceReserved="false" />
+    <EditTextPreference
+        android:key="@string/pref_key_custom_glean_server_url"
+        android:title="@string/preferences_debug_settings_custom_glean_server_url"
+        android:inputType="textUri"
+        app:useSimpleSummaryProvider="true"
+        app:iconSpaceReserved="false" />
 </PreferenceScreen>

app/src/test/java/org/mozilla/fenix/ext/ConfigurationKtTest.kt

@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.ext
+
+import io.mockk.mockk
+import mozilla.components.service.glean.config.Configuration
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotEquals
+import org.junit.Test
+
+class ConfigurationKtTest {
+    @Test
+    fun `GIVEN server endpoint is null THEN return the same configuration`() {
+        val configuration = Configuration(httpClient = mockk())
+
+        assertEquals(configuration, configuration.setCustomEndpointIfAvailable(null))
+    }
+
+    @Test
+    fun `GIVEN server endpoint is not empty THEN make a copy of configuration with server endpoint`() {
+        val configuration = Configuration(httpClient = mockk())
+
+        assertNotEquals(configuration, configuration.setCustomEndpointIfAvailable("test"))
+    }
+
+    @Test
+    fun `GIVEN server endpoint is empty THEN return the same configuration`() {
+        val configuration = Configuration(httpClient = mockk())
+
+        assertEquals(configuration, configuration.setCustomEndpointIfAvailable(""))
+    }
+}