feat(Instagram): Add Limit feed to followed profiles patch (#5908)

extensions/instagram/build.gradle.kts

@@ -0,0 +1,3 @@
+dependencies {
+    compileOnly(project(":extensions:shared:library"))
+}

extensions/instagram/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest/>

extensions/instagram/src/main/java/app/revanced/extension/instagram/feed/LimitFeedToFollowedProfiles.java

@@ -0,0 +1,18 @@
+package app.revanced.extension.instagram.feed;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@SuppressWarnings("unused")
+public class LimitFeedToFollowedProfiles {
+
+    /**
+     * Injection point.
+     */
+    public static Map<String, String> setFollowingHeader(Map<String, String> requestHeaderMap) {
+        // Create new map as original is unmodifiable.
+        Map<String, String> patchedRequestHeaderMap = new HashMap<>(requestHeaderMap);
+        patchedRequestHeaderMap.put("pagination_source", "following");
+        return patchedRequestHeaderMap;
+    }
+}

patches/api/patches.api

@@ -264,6 +264,10 @@ public final class app/revanced/patches/instagram/ads/HideAdsPatchKt {
 	public static final fun getHideAdsPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }
 
+public final class app/revanced/patches/instagram/feed/LimitFeedToFollowedProfilesKt {
+	public static final fun getLimitFeedToFollowedProfiles ()Lapp/revanced/patcher/patch/BytecodePatch;
+}
+
 public final class app/revanced/patches/instagram/hide/explore/HideExploreFeedKt {
 	public static final fun getHideExportFeedPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }
@@ -276,6 +280,10 @@ public final class app/revanced/patches/instagram/hide/stories/HideStoriesKt {
 	public static final fun getHideStoriesPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }
 
+public final class app/revanced/patches/instagram/misc/extension/SharedExtensionPatchKt {
+	public static final fun getSharedExtensionPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
+}
+
 public final class app/revanced/patches/instagram/misc/signature/SignatureCheckPatchKt {
 	public static final fun getSignatureCheckPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }

patches/src/main/kotlin/app/revanced/patches/instagram/feed/Fingerprints.kt

@@ -0,0 +1,20 @@
+package app.revanced.patches.instagram.feed
+
+import app.revanced.patcher.fingerprint
+import app.revanced.patcher.patch.BytecodePatchContext
+
+internal val mainFeedRequestClassFingerprint = fingerprint {
+    strings("Request{mReason=", ", mInstanceNumber=")
+}
+
+context(BytecodePatchContext)
+internal val initMainFeedRequestFingerprint get() = fingerprint {
+    custom { method, classDef ->
+        method.name == "<init>" &&
+                classDef == mainFeedRequestClassFingerprint.classDef
+    }
+}
+
+internal val mainFeedHeaderMapFinderFingerprint = fingerprint {
+    strings("pagination_source", "FEED_REQUEST_SENT")
+}

patches/src/main/kotlin/app/revanced/patches/instagram/feed/LimitFeedToFollowedProfiles.kt

@@ -0,0 +1,63 @@
+package app.revanced.patches.instagram.feed
+
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
+import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
+import app.revanced.patcher.patch.bytecodePatch
+import app.revanced.patches.instagram.misc.extension.sharedExtensionPatch
+import app.revanced.util.getReference
+import app.revanced.util.indexOfFirstInstructionOrThrow
+import com.android.tools.smali.dexlib2.iface.instruction.TwoRegisterInstruction
+import com.android.tools.smali.dexlib2.iface.reference.FieldReference
+
+internal const val EXTENSION_CLASS_DESCRIPTOR = "Lapp/revanced/extension/instagram/feed/LimitFeedToFollowedProfiles;"
+
+@Suppress("unused")
+val limitFeedToFollowedProfiles = bytecodePatch(
+    name = "Limit feed to followed profiles",
+    description = "Filters the home feed to display only content from profiles you follow.",
+) {
+    compatibleWith("com.instagram.android")
+
+    dependsOn(sharedExtensionPatch)
+
+    execute {
+        /**
+         * Since the header field is obfuscated and there is no easy way to identify it among all the class fields,
+         * an additional method is fingerprinted.
+         * This method uses the map, so we can get the field name of the map field using this.
+         */
+        val mainFeedRequestHeaderFieldName: String
+
+        with(mainFeedHeaderMapFinderFingerprint.method) {
+            mainFeedRequestHeaderFieldName = indexOfFirstInstructionOrThrow {
+                getReference<FieldReference>().let { ref ->
+                    ref?.type == "Ljava/util/Map;" &&
+                            ref.definingClass == mainFeedRequestClassFingerprint.classDef.toString()
+
+                }
+            }.let { instructionIndex ->
+                getInstruction(instructionIndex).getReference<FieldReference>()!!.name
+            }
+        }
+
+        initMainFeedRequestFingerprint.method.apply {
+            // Finds the instruction where the map is being initialized in the constructor
+            val getHeaderIndex = indexOfFirstInstructionOrThrow {
+                getReference<FieldReference>().let {
+                    it?.name == mainFeedRequestHeaderFieldName
+                }
+            }
+
+            val paramHeaderRegister = getInstruction<TwoRegisterInstruction>(getHeaderIndex).registerA
+
+            // Replace the `pagination_source` header value with `following` in the feed/timeline request.
+            addInstructions(
+                getHeaderIndex,
+                """
+                    invoke-static { v$paramHeaderRegister }, $EXTENSION_CLASS_DESCRIPTOR->setFollowingHeader(Ljava/util/Map;)Ljava/util/Map;
+                    move-result-object v$paramHeaderRegister
+                """
+            )
+        }
+    }
+}

patches/src/main/kotlin/app/revanced/patches/instagram/hide/navigation/HideNavigationButtons.kt

@@ -49,7 +49,7 @@ val hideNavigationButtonsPatch = bytecodePatch(
                 val freeRegister = findFreeRegister(insertIndex, loopIndexRegister)
                 val instruction = getInstruction(endIndex - 1)
 
-                var instructions = buildString {
+                val instructions = buildString {
                     if (hideCreate!!) {
                         appendLine(
                             """

patches/src/main/kotlin/app/revanced/patches/instagram/misc/extension/SharedExtensionPatch.kt

@@ -0,0 +1,9 @@
+package app.revanced.patches.instagram.misc.extension
+
+import app.revanced.patches.instagram.misc.extension.hooks.applicationInitHook
+import app.revanced.patches.shared.misc.extension.sharedExtensionPatch
+
+val sharedExtensionPatch = sharedExtensionPatch(
+    "instagram",
+    applicationInitHook,
+)

patches/src/main/kotlin/app/revanced/patches/instagram/misc/extension/hooks/ApplicationInitHook.kt

@@ -0,0 +1,9 @@
+package app.revanced.patches.instagram.misc.extension.hooks
+
+import app.revanced.patches.shared.misc.extension.extensionHook
+
+internal val applicationInitHook = extensionHook {
+    custom { method, classDef ->
+        method.name == "onCreate" && classDef.endsWith("/InstagramAppShell;")
+    }
+}