feat: downloads patch (#215)

src/main/kotlin/app/revanced/patches/youtube/interaction/downloads/annotation/DownloadsCompatibility.kt

@@ -0,0 +1,14 @@
+package app.revanced.patches.youtube.interaction.downloads.annotation
+
+import app.revanced.patcher.annotation.Compatibility
+import app.revanced.patcher.annotation.Package
+
+@Compatibility(
+    [Package(
+        "com.google.android.youtube", arrayOf("17.27.39", "17.32.35")
+    )]
+)
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+internal annotation class DownloadsCompatibility
+

src/main/kotlin/app/revanced/patches/youtube/interaction/downloads/bytecode/patch/DownloadsBytecodePatch.kt

@@ -0,0 +1,52 @@
+package app.revanced.patches.youtube.interaction.downloads.bytecode.patch
+
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.impl.BytecodeData
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.DependsOn
+import app.revanced.patcher.patch.annotations.Patch
+import app.revanced.patcher.patch.impl.BytecodePatch
+import app.revanced.patches.youtube.interaction.downloads.annotation.DownloadsCompatibility
+import app.revanced.patches.youtube.interaction.downloads.resource.patch.DownloadsResourcePatch
+import app.revanced.patches.youtube.misc.playercontrols.bytecode.patch.PlayerControlsBytecodePatch
+import app.revanced.patches.youtube.misc.videoid.patch.VideoIdPatch
+
+@Patch
+@Name("downloads")
+@DependsOn([DownloadsResourcePatch::class, PlayerControlsBytecodePatch::class, VideoIdPatch::class])
+@Description("Enables downloading music and videos from YouTube.")
+@DownloadsCompatibility
+@Version("0.0.1")
+class DownloadsBytecodePatch : BytecodePatch() {
+    override fun execute(data: BytecodeData): PatchResult {
+        val integrationsPackage = "app/revanced/integrations"
+        val classDescriptor = "L$integrationsPackage/videoplayer/DownloadButton;"
+
+        /*
+        initialize the control
+         */
+
+        val initializeDownloadsDescriptor = "$classDescriptor->initializeDownloadButton(Ljava/lang/Object;)V"
+        PlayerControlsBytecodePatch.initializeControl(initializeDownloadsDescriptor)
+
+        /*
+         add code to change the visibility of the control
+         */
+
+        val changeVisibilityDescriptor = "$classDescriptor->changeVisibility(Z)V"
+        PlayerControlsBytecodePatch.injectVisibilityCheckCall(changeVisibilityDescriptor)
+
+        /*
+         add code to change to update the video id
+         */
+
+        val setVideoIdDescriptor =
+            "L$integrationsPackage/patches/downloads/DownloadsPatch;->setVideoId(Ljava/lang/String;)V"
+        VideoIdPatch.injectCall(setVideoIdDescriptor)
+
+        return PatchResultSuccess()
+    }
+}

src/main/kotlin/app/revanced/patches/youtube/interaction/downloads/resource/patch/DownloadsResourcePatch.kt

@@ -0,0 +1,56 @@
+package app.revanced.patches.youtube.interaction.downloads.resource.patch
+
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.impl.ResourceData
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.DependsOn
+import app.revanced.patcher.patch.impl.ResourcePatch
+import app.revanced.patches.youtube.interaction.downloads.annotation.DownloadsCompatibility
+import app.revanced.patches.youtube.misc.manifest.patch.FixLocaleConfigErrorPatch
+import app.revanced.patches.youtube.misc.playercontrols.resource.patch.BottomControlsResourcePatch
+import app.revanced.patches.youtube.misc.settings.bytecode.patch.SettingsPatch
+import app.revanced.patches.youtube.misc.settings.framework.components.impl.StringResource
+import app.revanced.patches.youtube.misc.settings.framework.components.impl.SwitchPreference
+import app.revanced.util.resources.ResourceUtils
+import app.revanced.util.resources.ResourceUtils.Settings.mergeStrings
+import app.revanced.util.resources.ResourceUtils.copyResources
+
+@Name("downloads-resource-patch")
+@DependsOn([BottomControlsResourcePatch::class, FixLocaleConfigErrorPatch::class, SettingsPatch::class])
+@Description("Makes necessary changes to resources for the download button.")
+@DownloadsCompatibility
+@Version("0.0.1")
+class DownloadsResourcePatch : ResourcePatch() {
+    override fun execute(data: ResourceData): PatchResult {
+        SettingsPatch.PreferenceScreen.LAYOUT.addPreferences(SwitchPreference(
+            "revanced_downloads",
+            StringResource("revanced_downloads_enabled_title", "Show download button"),
+            true,
+            StringResource("revanced_downloads_enabled_summary_on", "Download button is visible"),
+            StringResource("revanced_downloads_enabled_summary_off", "Download button is hidden")
+        ))
+
+        /*
+         * Copy strings
+         */
+
+        data.mergeStrings("downloads/host/values/strings.xml")
+
+        /*
+         * Copy resources
+         */
+
+        data.copyResources("downloads", ResourceUtils.ResourceGroup("drawable", "revanced_yt_download_button.xml"))
+
+        /*
+        * Add download button node
+         */
+
+        BottomControlsResourcePatch.addControls("downloads/host/layout/${BottomControlsResourcePatch.TARGET_RESOURCE_NAME}")
+
+        return PatchResultSuccess()
+    }
+}

src/main/kotlin/app/revanced/patches/youtube/interaction/swipecontrols/patch/resource/SwipeControlsResourcePatch.kt

@@ -1,6 +1,5 @@
 package app.revanced.patches.youtube.interaction.swipecontrols.patch.resource
 
-import app.revanced.extensions.injectResources
 import app.revanced.patcher.annotation.Name
 import app.revanced.patcher.annotation.Version
 import app.revanced.patcher.data.impl.ResourceData
@@ -11,6 +10,8 @@ import app.revanced.patcher.patch.impl.ResourcePatch
 import app.revanced.patches.youtube.interaction.swipecontrols.annotation.SwipeControlsCompatibility
 import app.revanced.patches.youtube.misc.settings.bytecode.patch.SettingsPatch
 import app.revanced.patches.youtube.misc.settings.framework.components.impl.*
+import app.revanced.util.resources.ResourceUtils
+import app.revanced.util.resources.ResourceUtils.copyResources
 
 @Name("swipe-controls-resource-patch")
 @DependsOn([SettingsPatch::class])
@@ -93,16 +94,15 @@ class SwipeControlsResourcePatch : ResourcePatch() {
 
         val resourcesDir = "swipecontrols"
 
-        data.injectResources(
+        data.copyResources(
-            this.javaClass.classLoader,
+            "swipecontrols",
-            resourcesDir,
+            ResourceUtils.ResourceGroup(
                 "drawable",
-            listOf(
+                "ic_sc_brightness_auto.xml",
-                "ic_sc_brightness_auto",
+                "ic_sc_brightness_manual.xml",
-                "ic_sc_brightness_manual",
+                "ic_sc_volume_mute.xml",
-                "ic_sc_volume_mute",
+                "ic_sc_volume_normal.xml"
-                "ic_sc_volume_normal"
+            )
-            ).map { "$it.xml" }
         )
         return PatchResultSuccess()
     }

src/main/kotlin/app/revanced/patches/youtube/layout/returnyoutubedislike/resource/patch/ReturnYouTubeDislikeResourcePatch.kt

@@ -13,7 +13,7 @@ import app.revanced.patches.youtube.misc.manifest.patch.FixLocaleConfigErrorPatc
 import app.revanced.patches.youtube.misc.settings.bytecode.patch.SettingsPatch
 import app.revanced.patches.youtube.misc.settings.framework.components.impl.Preference
 import app.revanced.patches.youtube.misc.settings.framework.components.impl.StringResource
-import app.revanced.util.resources.ResourceUtils.iterateXmlNodeChildren
+import app.revanced.util.resources.ResourceUtils.Settings.mergeStrings
 
 @DependsOn([FixLocaleConfigErrorPatch::class, SettingsPatch::class])
 @Name("return-youtube-dislike-resource-patch")
@@ -35,12 +35,7 @@ class ReturnYouTubeDislikeResourcePatch : ResourcePatch() {
             )
         )
         // merge strings
-        data.iterateXmlNodeChildren("returnyoutubedislike/host/values/strings.xml", "resources") {
+        data.mergeStrings("returnyoutubedislike/host/values/strings.xml")
-            // TODO: figure out why this is needed
-            if (!it.hasAttributes()) return@iterateXmlNodeChildren
-            val attributes = it.attributes
-            SettingsPatch.addString(attributes.getNamedItem("name")!!.nodeValue!!, it.textContent!!)
-        }
 
         return PatchResultSuccess()
     }

src/main/kotlin/app/revanced/patches/youtube/layout/sponsorblock/bytecode/fingerprints/ShowPlayerControlsFingerprint.kt

@@ -1,19 +0,0 @@
-package app.revanced.patches.youtube.layout.sponsorblock.bytecode.fingerprints
-
-import app.revanced.patcher.annotation.Name
-import app.revanced.patcher.annotation.Version
-import app.revanced.patcher.fingerprint.method.annotation.DirectPatternScanMethod
-import app.revanced.patcher.fingerprint.method.annotation.MatchingMethod
-import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
-import app.revanced.patches.youtube.layout.sponsorblock.annotations.SponsorBlockCompatibility
-
-@Name("show-player-controls-fingerprint")
-@MatchingMethod(
-    "LYouTubeControlsOverlay;", "ac"
-)
-@DirectPatternScanMethod
-@SponsorBlockCompatibility
-@Version("0.0.1")
-object ShowPlayerControlsFingerprint : MethodFingerprint(
-    "V", null, listOf("Z","Z"), null,  null
-)

src/main/kotlin/app/revanced/patches/youtube/layout/sponsorblock/bytecode/patch/SponsorBlockBytecodePatch.kt

@@ -23,6 +23,7 @@ import app.revanced.patches.youtube.layout.sponsorblock.bytecode.fingerprints.*
 import app.revanced.patches.youtube.layout.sponsorblock.resource.patch.SponsorBlockResourcePatch
 import app.revanced.patches.youtube.misc.integrations.patch.IntegrationsPatch
 import app.revanced.patches.youtube.misc.mapping.patch.ResourceIdMappingProviderResourcePatch
+import app.revanced.patches.youtube.misc.playercontrols.bytecode.patch.PlayerControlsBytecodePatch
 import app.revanced.patches.youtube.misc.videoid.patch.VideoIdPatch
 import org.jf.dexlib2.AccessFlags
 import org.jf.dexlib2.Opcode
@@ -38,7 +39,7 @@ import org.jf.dexlib2.util.MethodUtil
 
 @Patch
 @DependsOn(
-    dependencies = [IntegrationsPatch::class, ResourceIdMappingProviderResourcePatch::class, SponsorBlockResourcePatch::class, VideoIdPatch::class]
+    dependencies = [PlayerControlsBytecodePatch::class, IntegrationsPatch::class, ResourceIdMappingProviderResourcePatch::class, SponsorBlockResourcePatch::class, VideoIdPatch::class]
 )
 @Name("sponsorblock")
 @Description("Integrate SponsorBlock.")
@@ -171,8 +172,7 @@ class SponsorBlockBytecodePatch : BytecodePatch(
         /*
         Voting & Shield button
          */
-        ShowPlayerControlsFingerprint.resolve(data, data.classes.find { it.type.endsWith("YouTubeControlsOverlay;") }!!)
+        val controlsMethodResult = PlayerControlsBytecodePatch.showPlayerControlsFingerprintResult
-        val controlsMethodResult = ShowPlayerControlsFingerprint.result!!
 
         val controlsLayoutStubResourceId =
             ResourceIdMappingProviderResourcePatch.resourceMappings.single { it.type == "id" && it.name == "controls_layout_stub" }.id
@@ -217,12 +217,8 @@ class SponsorBlockBytecodePatch : BytecodePatch(
         }
 
         // change visibility of the buttons
-        controlsMethodResult.mutableMethod.addInstructions(
+        PlayerControlsBytecodePatch.injectVisibilityCheckCall("Lapp/revanced/integrations/sponsorblock/ShieldButton;->changeVisibility(Z)V")
-            0, """
+        PlayerControlsBytecodePatch.injectVisibilityCheckCall("Lapp/revanced/integrations/sponsorblock/VotingButton;->changeVisibility(Z)V")
-                invoke-static {p1}, Lapp/revanced/integrations/sponsorblock/ShieldButton;->changeVisibility(Z)V
-                invoke-static {p1}, Lapp/revanced/integrations/sponsorblock/VotingButton;->changeVisibility(Z)V
-            """.trimIndent()
-        )
 
         // set SegmentHelperLayout.context to the player layout instance
         val instanceRegister = 0

src/main/kotlin/app/revanced/patches/youtube/layout/sponsorblock/resource/patch/SponsorBlockResourcePatch.kt

@@ -13,9 +13,9 @@ import app.revanced.patches.youtube.misc.settings.bytecode.patch.SettingsPatch
 import app.revanced.patches.youtube.misc.settings.framework.components.impl.Preference
 import app.revanced.patches.youtube.misc.settings.framework.components.impl.StringResource
 import app.revanced.util.resources.ResourceUtils
+import app.revanced.util.resources.ResourceUtils.Settings.mergeStrings
 import app.revanced.util.resources.ResourceUtils.copyResources
 import app.revanced.util.resources.ResourceUtils.copyXmlNode
-import app.revanced.util.resources.ResourceUtils.iterateXmlNodeChildren
 
 @Name("sponsorblock-resource-patch")
 @SponsorBlockCompatibility
@@ -40,20 +40,7 @@ class SponsorBlockResourcePatch : ResourcePatch() {
         /*
          merge SponsorBlock strings to main strings
          */
-        data.iterateXmlNodeChildren("sponsorblock/host/values/strings.xml", "resources") {
+        data.mergeStrings("sponsorblock/host/values/strings.xml")
-            // TODO: figure out why this is needed
-            if (!it.hasAttributes()) return@iterateXmlNodeChildren
-
-            val attributes = it.attributes
-            val key = attributes.getNamedItem("name")!!.nodeValue!!
-            val value = it.textContent!!
-
-            // all strings of SponsorBlock which have this attribute have the attribute value false,
-            // hence a null check suffices
-            val formatted = attributes.getNamedItem("formatted") == null
-
-            SettingsPatch.addString(key, value, formatted)
-        }
 
         /*
          merge SponsorBlock drawables to main drawables

src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/annotation/PlayerControlsCompatibility.kt

@@ -0,0 +1,13 @@
+package app.revanced.patches.youtube.misc.playercontrols.annotation
+
+import app.revanced.patcher.annotation.Compatibility
+import app.revanced.patcher.annotation.Package
+
+@Compatibility(
+    [Package(
+        "com.google.android.youtube", arrayOf("17.27.39", "17.32.35")
+    )]
+)
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+internal annotation class PlayerControlsCompatibility

src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/bytecode/patch/PlayerControlsBytecodePatch.kt

@@ -0,0 +1,83 @@
+package app.revanced.patches.youtube.misc.playercontrols.bytecode.patch
+
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.impl.BytecodeData
+import app.revanced.patcher.extensions.addInstruction
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprintResult
+import app.revanced.patcher.fingerprint.method.utils.MethodFingerprintUtils.resolve
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.DependsOn
+import app.revanced.patcher.patch.impl.BytecodePatch
+import app.revanced.patches.youtube.misc.mapping.patch.ResourceIdMappingProviderResourcePatch
+import app.revanced.patches.youtube.misc.playercontrols.annotation.PlayerControlsCompatibility
+import app.revanced.patches.youtube.misc.playercontrols.fingerprints.BottomControlsInflateFingerprint
+import app.revanced.patches.youtube.misc.playercontrols.fingerprints.PlayerControlsVisibilityFingerprint
+import org.jf.dexlib2.iface.instruction.OneRegisterInstruction
+
+@Name("player-controls-bytecode-patch")
+@DependsOn([ResourceIdMappingProviderResourcePatch::class])
+@Description("Manages the code for the player controls of the YouTube player.")
+@PlayerControlsCompatibility
+@Version("0.0.1")
+class PlayerControlsBytecodePatch : BytecodePatch(
+    listOf(PlayerControlsVisibilityFingerprint)
+) {
+    override fun execute(data: BytecodeData): PatchResult {
+        showPlayerControlsFingerprintResult = PlayerControlsVisibilityFingerprint.result!!
+
+        bottomUiContainerResourceId = ResourceIdMappingProviderResourcePatch
+            .resourceMappings
+            .single { it.type == "id" && it.name == "bottom_ui_container_stub" }.id
+
+        // TODO: another solution is required, this is hacky
+        listOf(BottomControlsInflateFingerprint).resolve(data, data.classes)
+        inflateFingerprintResult = BottomControlsInflateFingerprint.result!!
+
+        return PatchResultSuccess()
+    }
+
+    internal companion object {
+        var bottomUiContainerResourceId: Long = 0
+
+        lateinit var showPlayerControlsFingerprintResult: MethodFingerprintResult
+
+        private var inflateFingerprintResult: MethodFingerprintResult? = null
+            set(fingerprint) {
+                field = fingerprint!!.also {
+                    moveToRegisterInstructionIndex = it.patternScanResult!!.endIndex
+                    viewRegister =
+                        (it.mutableMethod.implementation!!.instructions[moveToRegisterInstructionIndex] as OneRegisterInstruction).registerA
+                }
+            }
+
+        private var moveToRegisterInstructionIndex: Int = 0
+        private var viewRegister: Int = 0
+
+        /**
+         * Injects the code to change the visibility of controls.
+         * @param descriptor The descriptor of the method which should be called.
+         */
+        fun injectVisibilityCheckCall(descriptor: String) {
+            showPlayerControlsFingerprintResult.mutableMethod.addInstruction(
+                0,
+                """
+                    invoke-static {p1}, $descriptor
+                """
+            )
+        }
+
+        /**
+         * Injects the code to initialize the controls.
+         * @param descriptor The descriptor of the method which should be calleed.
+         */
+        fun initializeControl(descriptor: String) {
+            inflateFingerprintResult!!.mutableMethod.addInstruction(
+                moveToRegisterInstructionIndex + 1,
+                "invoke-static {v$viewRegister}, $descriptor"
+            )
+        }
+    }
+}

src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/fingerprints/BottomControlsInflateFingerprint.kt

@@ -0,0 +1,31 @@
+package app.revanced.patches.youtube.misc.playercontrols.fingerprints
+
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.fingerprint.method.annotation.DirectPatternScanMethod
+import app.revanced.patcher.fingerprint.method.annotation.MatchingMethod
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import app.revanced.patches.youtube.misc.playercontrols.annotation.PlayerControlsCompatibility
+import app.revanced.patches.youtube.misc.playercontrols.bytecode.patch.PlayerControlsBytecodePatch
+import org.jf.dexlib2.Opcode
+import org.jf.dexlib2.iface.instruction.WideLiteralInstruction
+
+@Name("bottom-controls-inflate-fingerprint")
+@MatchingMethod(
+    "Lknf;", "a"
+)
+@DirectPatternScanMethod
+@PlayerControlsCompatibility
+@Version("0.0.1")
+object BottomControlsInflateFingerprint : MethodFingerprint(
+    null, null, null, listOf(
+        Opcode.CHECK_CAST,
+        Opcode.INVOKE_VIRTUAL,
+        Opcode.MOVE_RESULT_OBJECT
+    ), null,
+    { methodDef ->
+        methodDef.implementation?.instructions?.any { instruction ->
+            (instruction as? WideLiteralInstruction)?.wideLiteral == PlayerControlsBytecodePatch.bottomUiContainerResourceId
+        } == true
+    }
+)

src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/fingerprints/PlayerControlsVisibilityFingerprint.kt

@@ -0,0 +1,21 @@
+package app.revanced.patches.youtube.misc.playercontrols.fingerprints
+
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.fingerprint.method.annotation.DirectPatternScanMethod
+import app.revanced.patcher.fingerprint.method.annotation.MatchingMethod
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import app.revanced.patches.youtube.misc.playercontrols.annotation.PlayerControlsCompatibility
+
+@Name("player-controls-visibility-fingerprint")
+@MatchingMethod(
+    "LYouTubeControlsOverlay;", "ag"
+)
+@DirectPatternScanMethod
+@PlayerControlsCompatibility
+@Version("0.0.1")
+object PlayerControlsVisibilityFingerprint : MethodFingerprint(
+    "V", null, listOf("Z", "Z"), null, null, { methodDef ->
+        methodDef.definingClass.endsWith("YouTubeControlsOverlay;")
+    }
+)

src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/resource/patch/BottomControlsResourcePatch.kt

@@ -0,0 +1,86 @@
+package app.revanced.patches.youtube.misc.playercontrols.resource.patch
+
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.impl.DomFileEditor
+import app.revanced.patcher.data.impl.ResourceData
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.DependsOn
+import app.revanced.patcher.patch.impl.ResourcePatch
+import app.revanced.patches.youtube.misc.manifest.patch.FixLocaleConfigErrorPatch
+import app.revanced.patches.youtube.misc.playercontrols.annotation.PlayerControlsCompatibility
+import java.io.Closeable
+
+@Name("bottom-controls-resource-patch")
+@DependsOn([FixLocaleConfigErrorPatch::class])
+@Description("Manages the resources for the bottom controls of the YouTube player.")
+@PlayerControlsCompatibility
+@Version("0.0.1")
+class BottomControlsResourcePatch : ResourcePatch(), Closeable {
+    override fun execute(data: ResourceData): PatchResult {
+        resourceData = data
+        targetXmlEditor = data.xmlEditor[TARGET_RESOURCE]
+
+        return PatchResultSuccess()
+    }
+
+    companion object {
+        internal const val TARGET_RESOURCE_NAME = "youtube_controls_bottom_ui_container.xml"
+        private const val TARGET_RESOURCE = "res/layout/$TARGET_RESOURCE_NAME"
+
+        private lateinit var resourceData: ResourceData
+        private lateinit var targetXmlEditor: DomFileEditor
+
+        // The element to which to add the new elements to
+        private var lastLeftOf = "fullscreen_button"
+
+
+
+        /**
+         * Add new controls to the bottom of the YouTube player.
+         * @param hostYouTubeControlsBottomUiResourceName The hosting resource name containing the elements.
+         */
+        internal fun addControls(hostYouTubeControlsBottomUiResourceName: String) {
+            val sourceXmlEditor =
+                resourceData.xmlEditor[this::class.java.classLoader.getResourceAsStream(
+                    hostYouTubeControlsBottomUiResourceName
+                )!!]
+
+            val targetElement =
+                "android.support.constraint.ConstraintLayout"
+
+            val hostElements = sourceXmlEditor.file.getElementsByTagName(targetElement).item(0).childNodes
+
+            val destinationResourceFile = this.targetXmlEditor.file
+            val destinationElement =
+                destinationResourceFile.getElementsByTagName(targetElement).item(0)
+
+            for (index in 1 until hostElements.length) {
+                val element = hostElements.item(index).cloneNode(true)
+
+                // if the element has no attributes theres no point to adding it to the destination
+                if (!element.hasAttributes()) continue
+
+                // set the elements lastLeftOf attribute to the lastLeftOf value
+                val namespace = "@+id"
+                element.attributes.getNamedItem("yt:layout_constraintRight_toLeftOf").nodeValue =
+                    "$namespace/$lastLeftOf"
+
+                // set lastLeftOf attribute to the the current element
+                val nameSpaceLength = 4
+                lastLeftOf = element.attributes.getNamedItem("android:id").nodeValue.substring(nameSpaceLength)
+
+                // copy the element
+                destinationResourceFile.adoptNode(element)
+                destinationElement.appendChild(element)
+            }
+            sourceXmlEditor.close()
+        }
+    }
+
+    override fun close() {
+        targetXmlEditor.close()
+    }
+}

src/main/kotlin/app/revanced/util/resources/ResourceUtils.kt

@@ -2,11 +2,38 @@ package app.revanced.util.resources
 
 import app.revanced.patcher.data.impl.DomFileEditor
 import app.revanced.patcher.data.impl.ResourceData
+import app.revanced.patches.youtube.misc.settings.bytecode.patch.SettingsPatch
+import app.revanced.patches.youtube.misc.settings.framework.components.impl.StringResource
 import org.w3c.dom.Node
 import java.nio.file.Files
 import java.nio.file.StandardCopyOption
 
 internal object ResourceUtils {
+
+    /**
+     * Settings related utilities
+     */
+    internal object Settings {
+        /**
+         * Merge strings. This handles [StringResource]s automatically.
+         * @param host The hosting xml resource. Needs to be a valid strings.xml resource.
+         */
+        internal fun ResourceData.mergeStrings(host: String) {
+            this.iterateXmlNodeChildren(host, "resources") {
+                // TODO: figure out why this is needed
+                if (!it.hasAttributes()) return@iterateXmlNodeChildren
+
+                val attributes = it.attributes
+                val key = attributes.getNamedItem("name")!!.nodeValue!!
+                val value = it.textContent!!
+
+                val formatted = attributes.getNamedItem("formatted") == null
+
+                SettingsPatch.addString(key, value, formatted)
+            }
+        }
+    }
+
     /**
      * Copy resources from the current class loader to the resource directory.
      * @param sourceResourceDirectory The source resource directory name.

src/main/resources/downloads/drawable/revanced_yt_download_button.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:tint="?attr/ytTextPrimary" android:height="24dp" android:width="24dp" android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="#ff000000" android:pathData="M19,9h-4V3H9v6H5l7,7 7,-7zM5,18v2h14v-2H5z"/>
+</vector>

src/main/resources/downloads/host/layout/youtube_controls_bottom_ui_container.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:yt="http://schemas.android.com/apk/res-auto" android:id="@+id/youtube_controls_bottom_ui_container" android:layout_width="match_parent" android:layout_height="wrap_content" android:layoutDirection="ltr">
+    <com.google.android.libraries.youtube.common.ui.TouchImageView android:id="@+id/download_button" android:paddingLeft="12dp" android:paddingTop="22dp" android:paddingRight="12dp" android:paddingBottom="16dp" android:longClickable="false" android:layout_width="60dp" android:layout_height="60dp" android:src="@drawable/revanced_yt_download_button" android:scaleType="center" yt:layout_constraintBottom_toTopOf="@+id/quick_actions_container" yt:layout_constraintRight_toLeftOf="@+id/fullscreen_button" style="@style/YouTubePlayerButton"/>
+</android.support.constraint.ConstraintLayout>

src/main/resources/downloads/host/values/strings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="powertube_not_installed_warning">PowerTube is not installed</string>
+    <string name="powertube_not_installed_notice">Please install PowerTube from https://github.com/razar-dev/PowerTube.</string>
+</resources>