feat(X): Add Unlock downloads patch

Author: oSumAtrIX

api/revanced-patches.api

@@ -1065,6 +1065,12 @@ public final class app/revanced/patches/twitch/misc/settings/SettingsResourcePat
 	public static final field INSTANCE Lapp/revanced/patches/twitch/misc/settings/SettingsResourcePatch;
 }
 
+public final class app/revanced/patches/twitter/interaction/downloads/UnlockDownloadsPatch : app/revanced/patcher/patch/BytecodePatch {
+	public static final field INSTANCE Lapp/revanced/patches/twitter/interaction/downloads/UnlockDownloadsPatch;
+	public fun execute (Lapp/revanced/patcher/data/BytecodeContext;)V
+	public synthetic fun execute (Lapp/revanced/patcher/data/Context;)V
+}
+
 public final class app/revanced/patches/twitter/layout/viewcount/HideViewCountPatch : app/revanced/patcher/patch/BytecodePatch {
 	public static final field INSTANCE Lapp/revanced/patches/twitter/layout/viewcount/HideViewCountPatch;
 	public fun execute (Lapp/revanced/patcher/data/BytecodeContext;)V

src/main/kotlin/app/revanced/patches/twitter/interaction/downloads/UnlockDownloadsPatch.kt

@@ -0,0 +1,50 @@
+package app.revanced.patches.twitter.interaction.downloads
+
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.extensions.InstructionExtensions.addInstruction
+import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
+import app.revanced.patcher.extensions.InstructionExtensions.getInstructions
+import app.revanced.patcher.fingerprint.MethodFingerprint
+import app.revanced.patcher.fingerprint.MethodFingerprintResult
+import app.revanced.patcher.patch.BytecodePatch
+import app.revanced.patcher.patch.annotation.CompatiblePackage
+import app.revanced.patcher.patch.annotation.Patch
+import app.revanced.patches.twitter.interaction.downloads.fingerprints.ConstructMediaOptionsSheetFingerprint
+import app.revanced.patches.twitter.interaction.downloads.fingerprints.ShowDownloadVideoUpsellBottomSheetFingerprint
+import app.revanced.util.exception
+import com.android.tools.smali.dexlib2.iface.instruction.OneRegisterInstruction
+import com.android.tools.smali.dexlib2.iface.instruction.TwoRegisterInstruction
+
+@Patch(
+    name = "Unlock downloads",
+    description = "Unlocks the ability to download any video.",
+    compatiblePackages = [CompatiblePackage("com.twitter.android")]
+)
+@Suppress("unused")
+object UnlockDownloadsPatch : BytecodePatch(
+    setOf(ConstructMediaOptionsSheetFingerprint, ShowDownloadVideoUpsellBottomSheetFingerprint)
+) {
+    override fun execute(context: BytecodeContext) {
+        fun MethodFingerprint.patch(getRegisterAndIndex: MethodFingerprintResult.() -> Pair<Int, Int>) = result?.let {
+            getRegisterAndIndex(it).let { (index, register) ->
+                it.mutableMethod.addInstruction(index, "const/4 v$register, 0x1")
+            }
+        } ?: throw exception
+
+        // Allow downloads for non-premium users.
+        ShowDownloadVideoUpsellBottomSheetFingerprint.patch {
+            val checkIndex = scanResult.patternScanResult!!.startIndex
+            val register = mutableMethod.getInstruction<OneRegisterInstruction>(checkIndex).registerA
+
+            checkIndex to register
+        }
+
+        // Force show the download menu item.
+        ConstructMediaOptionsSheetFingerprint.patch {
+            val showDownloadButtonIndex = mutableMethod.getInstructions().lastIndex - 1
+            val register = mutableMethod.getInstruction<TwoRegisterInstruction>(showDownloadButtonIndex).registerA
+
+            showDownloadButtonIndex to register
+        }
+    }
+}

src/main/kotlin/app/revanced/patches/twitter/interaction/downloads/fingerprints/ConstructMediaOptionsSheetFingerprint.kt

@@ -0,0 +1,12 @@
+package app.revanced.patches.twitter.interaction.downloads.fingerprints
+
+import app.revanced.patcher.extensions.or
+import app.revanced.patcher.fingerprint.MethodFingerprint
+import com.android.tools.smali.dexlib2.AccessFlags
+
+
+internal object ConstructMediaOptionsSheetFingerprint : MethodFingerprint(
+    returnType = "V",
+    accessFlags = AccessFlags.PUBLIC or AccessFlags.CONSTRUCTOR,
+    strings = listOf("captionsState")
+)

src/main/kotlin/app/revanced/patches/twitter/interaction/downloads/fingerprints/ShowDownloadVideoUpsellBottomSheetFingerprint.kt

@@ -0,0 +1,10 @@
+package app.revanced.patches.twitter.interaction.downloads.fingerprints
+
+import app.revanced.patcher.fingerprint.MethodFingerprint
+import com.android.tools.smali.dexlib2.Opcode
+
+internal object ShowDownloadVideoUpsellBottomSheetFingerprint : MethodFingerprint(
+    returnType = "Z",
+    strings = listOf("variantToDownload.url"),
+    opcodes = listOf(Opcode.IF_EQZ)
+)