feat(pixiv): add `hide-ads` patch (#2578)

Co-authored-by: oSumAtrIX <johan.melkonyan1@web.de>

src/main/kotlin/app/revanced/patches/pixiv/ads/fingerprints/IsNotPremiumFingerprint.kt

@@ -0,0 +1,21 @@
+package app.revanced.patches.pixiv.ads.fingerprints
+
+import app.revanced.patcher.extensions.or
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import org.jf.dexlib2.AccessFlags
+
+
+object IsNotPremiumFingerprint : MethodFingerprint(
+    "V",
+    AccessFlags.PUBLIC or AccessFlags.CONSTRUCTOR,
+    listOf("L"),
+    strings = listOf("pixivAccountManager"),
+    customFingerprint = custom@{ _, classDef ->
+        // The "isNotPremium" method is the only method in the class.
+        if (classDef.virtualMethods.count() != 1) return@custom false
+
+        classDef.virtualMethods.first().let { isNotPremiumMethod ->
+            isNotPremiumMethod.parameterTypes.size == 0 && isNotPremiumMethod.returnType == "Z"
+        }
+    }
+)

src/main/kotlin/app/revanced/patches/pixiv/ads/patch/HideAdsPatch.kt

@@ -0,0 +1,33 @@
+package app.revanced.patches.pixiv.ads.patch
+
+import app.revanced.extensions.toErrorResult
+import app.revanced.patcher.annotation.*
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
+import app.revanced.patcher.patch.BytecodePatch
+import app.revanced.patcher.patch.PatchResult
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.Patch
+import app.revanced.patches.pixiv.ads.fingerprints.IsNotPremiumFingerprint
+
+@Patch
+@Name("hide-ads")
+@Description("Hides ads.")
+@Compatibility([Package("jp.pxv.android")])
+@Version("0.0.1")
+class HideAdsPatch : BytecodePatch(listOf(IsNotPremiumFingerprint)) {
+    override fun execute(context: BytecodeContext): PatchResult {
+        // Always return false in the "isNotPremium" method which normally returns !this.accountManager.isPremium.
+        // However, this is not the method that controls the user's premium status.
+        // Instead, this method is used to determine whether ads should be shown.
+        IsNotPremiumFingerprint.result?.mutableClass?.virtualMethods?.first()?.addInstructions(
+            0,
+            """
+                const/4 v0, 0x0
+                return v0
+            """
+        ) ?: return IsNotPremiumFingerprint.toErrorResult()
+
+        return PatchResultSuccess()
+    }
+}