feat(YouTube/Change start page): change the actual start page instead of redirecting the Url https://github.com/inotia00/ReVanced_Extended/issues/2395

src/main/kotlin/app/revanced/patches/youtube/general/startpage/ChangeStartPagePatch.kt

@@ -2,13 +2,20 @@ package app.revanced.patches.youtube.general.startpage
 
 import app.revanced.patcher.data.BytecodeContext
 import app.revanced.patcher.extensions.InstructionExtensions.addInstruction
-import app.revanced.patches.youtube.general.startpage.fingerprints.ShortcutsActivityFingerprint
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
-import app.revanced.patches.youtube.general.startpage.fingerprints.UrlActivityFingerprint
+import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
+import app.revanced.patches.youtube.general.startpage.fingerprints.BrowseIdFingerprint
+import app.revanced.patches.youtube.general.startpage.fingerprints.IntentActionFingerprint
 import app.revanced.patches.youtube.utils.compatibility.Constants.COMPATIBLE_PACKAGE
-import app.revanced.patches.youtube.utils.integrations.Constants.GENERAL_CLASS_DESCRIPTOR
+import app.revanced.patches.youtube.utils.integrations.Constants.GENERAL_PATH
 import app.revanced.patches.youtube.utils.settings.SettingsPatch
+import app.revanced.util.getReference
+import app.revanced.util.indexOfFirstInstructionOrThrow
 import app.revanced.util.patch.BaseBytecodePatch
 import app.revanced.util.resultOrThrow
+import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.iface.instruction.OneRegisterInstruction
+import com.android.tools.smali.dexlib2.iface.reference.StringReference
 
 @Suppress("unused")
 object ChangeStartPagePatch : BaseBytecodePatch(
@@ -17,22 +24,37 @@ object ChangeStartPagePatch : BaseBytecodePatch(
     dependencies = setOf(SettingsPatch::class),
     compatiblePackages = COMPATIBLE_PACKAGE,
     fingerprints = setOf(
-        ShortcutsActivityFingerprint,
+        BrowseIdFingerprint,
-        UrlActivityFingerprint
+        IntentActionFingerprint,
     )
 ) {
+    private const val INTEGRATIONS_CLASS_DESCRIPTOR = "$GENERAL_PATH/ChangeStartPagePatch;"
+
     override fun execute(context: BytecodeContext) {
 
-        mapOf(
+        // Hook broseId.
-            ShortcutsActivityFingerprint to "changeStartPageToShortcuts",
+        BrowseIdFingerprint.resultOrThrow().mutableMethod.apply {
-            UrlActivityFingerprint to "changeStartPageToUrl"
+            val browseIdIndex = indexOfFirstInstructionOrThrow {
-        ).forEach { (fingerprint, method) ->
+                opcode == Opcode.CONST_STRING &&
-            fingerprint.resultOrThrow().mutableMethod.addInstruction(
+                        getReference<StringReference>()?.string == "FEwhat_to_watch"
-                0,
+            }
-                "invoke-static { p1 }, $GENERAL_CLASS_DESCRIPTOR->$method(Landroid/content/Intent;)V"
+            val browseIdRegister = getInstruction<OneRegisterInstruction>(browseIdIndex).registerA
+
+            addInstructions(
+                browseIdIndex + 1, """
+                    invoke-static { v$browseIdRegister }, $INTEGRATIONS_CLASS_DESCRIPTOR->overrideBrowseId(Ljava/lang/String;)Ljava/lang/String;
+                    move-result-object v$browseIdRegister
+                    """
             )
         }
 
+        // There is no browserId assigned to Shorts and Search.
+        // Just hook the Intent action.
+        IntentActionFingerprint.resultOrThrow().mutableMethod.addInstruction(
+            0,
+            "invoke-static { p1 }, $INTEGRATIONS_CLASS_DESCRIPTOR->overrideIntentAction(Landroid/content/Intent;)V"
+        )
+
         /**
          * Add settings
          */

src/main/kotlin/app/revanced/patches/youtube/general/startpage/fingerprints/BrowseIdFingerprint.kt

@@ -0,0 +1,15 @@
+package app.revanced.patches.youtube.general.startpage.fingerprints
+
+import app.revanced.patcher.fingerprint.MethodFingerprint
+import com.android.tools.smali.dexlib2.Opcode
+
+internal object BrowseIdFingerprint : MethodFingerprint(
+    returnType = "Lcom/google/android/apps/youtube/app/common/ui/navigation/PaneDescriptor;",
+    parameters = emptyList(),
+    opcodes = listOf(
+        Opcode.INVOKE_VIRTUAL,
+        Opcode.MOVE_RESULT_OBJECT,
+        Opcode.RETURN_OBJECT,
+    ),
+    strings = listOf("FEwhat_to_watch"),
+)

src/main/kotlin/app/revanced/patches/youtube/general/startpage/fingerprints/IntentActionFingerprint.kt

@@ -2,7 +2,7 @@ package app.revanced.patches.youtube.general.startpage.fingerprints
 
 import app.revanced.patcher.fingerprint.MethodFingerprint
 
-internal object ShortcutsActivityFingerprint : MethodFingerprint(
+internal object IntentActionFingerprint : MethodFingerprint(
     parameters = listOf("Landroid/content/Intent;"),
     strings = listOf("has_handled_intent"),
 )

src/main/kotlin/app/revanced/patches/youtube/general/startpage/fingerprints/UrlActivityFingerprint.kt

@@ -1,11 +0,0 @@
-package app.revanced.patches.youtube.general.startpage.fingerprints
-
-import app.revanced.patcher.fingerprint.MethodFingerprint
-
-internal object UrlActivityFingerprint : MethodFingerprint(
-    parameters = listOf("Landroid/content/Intent;"),
-    customFingerprint = { methodDef, classDef ->
-        methodDef.name == "startActivity"
-                && classDef.type.endsWith("/Shell_HomeActivity;")
-    }
-)

src/main/resources/youtube/settings/host/values/arrays.xml

@@ -25,9 +25,9 @@
     <string-array name="revanced_change_start_page_entries">
         <item>@string/revanced_change_start_page_entry_default</item>
         <item>@string/revanced_change_start_page_entry_search</item>
+        <item>@string/revanced_change_start_page_entry_shorts</item>
         <item>@string/revanced_change_start_page_entry_subscriptions</item>
         <item>@string/revanced_change_start_page_entry_explore</item>
-        <item>@string/revanced_change_start_page_entry_shorts</item>
         <item>@string/revanced_change_start_page_entry_library</item>
         <item>@string/revanced_change_start_page_entry_liked_videos</item>
         <item>@string/revanced_change_start_page_entry_watch_later</item>
@@ -41,24 +41,24 @@
         <item>@string/revanced_change_start_page_entry_browse</item>
     </string-array>
     <string-array name="revanced_change_start_page_entry_values">
-        <item></item>
+        <item>ORIGINAL</item>
-        <!-- YouTube Shortcuts -->
+        <!-- Intent Action -->
-        <item>open.search</item>
+        <item>SEARCH</item>
-        <item>open.subscriptions</item>
+        <item>SHORTS</item>
-        <item>open.explore</item>
+        <!-- Browser Id -->
-        <item>open.shorts</item>
+        <item>SUBSCRIPTIONS</item>
-        <!-- YouTube Widgets -->
+        <item>EXPLORE</item>
-        <item>www.youtube.com/feed/library</item>
+        <item>LIBRARY</item>
-        <item>www.youtube.com/playlist?list=LL</item>
+        <item>LIKED_VIDEO</item>
-        <item>www.youtube.com/playlist?list=WL</item>
+        <item>WATCH_LATER</item>
-        <item>www.youtube.com/feed/history</item>
+        <item>HISTORY</item>
-        <item>www.youtube.com/feed/trending</item>
+        <item>TRENDING</item>
-        <item>www.youtube.com/gaming</item>
+        <item>GAMING</item>
-        <item>www.youtube.com/channel/UC4R8DWoMoI7CAwX8_LjQHig</item>
+        <item>LIVE</item>
-        <item>www.youtube.com/channel/UC-9-kyTW8ZkZNDHQJ6FgpwQ</item>
+        <item>MUSIC</item>
-        <item>www.youtube.com/feed/storefront?bp=ogUCKAI%3D</item>
+        <item>MOVIE</item>
-        <item>www.youtube.com/channel/UCEgdi0XIXXZ-qJOFPf4JSKw</item>
+        <item>SPORTS</item>
-        <item>www.youtube.com/feed/guide_builder</item>
+        <item>BROWSE</item>
     </string-array>
     <string-array name="revanced_change_shorts_repeat_state_entries">
         <item>@string/revanced_change_shorts_repeat_state_entry_default</item>