From 78a43b8abd972172eab99519dfa636ce77d9e64f Mon Sep 17 00:00:00 2001
From: oSumAtrIX <johan.melkonyan1@web.de>
Date: Thu, 22 Dec 2022 00:38:16 +0100
Subject: [PATCH] feat(tasker): `unlock-license` patch (#1339)

---
 .../annotations/UnlockLicenseCompatibility.kt |  9 ++++
 .../fingerprints/CheckLicenseFingerprint.kt   | 14 ++++++
 .../unlock/patch/UnlockLicensePatch.kt        | 46 +++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 src/main/kotlin/app/revanced/patches/tasker/license/unlock/annotations/UnlockLicenseCompatibility.kt
 create mode 100644 src/main/kotlin/app/revanced/patches/tasker/license/unlock/fingerprints/CheckLicenseFingerprint.kt
 create mode 100644 src/main/kotlin/app/revanced/patches/tasker/license/unlock/patch/UnlockLicensePatch.kt

diff --git a/src/main/kotlin/app/revanced/patches/tasker/license/unlock/annotations/UnlockLicenseCompatibility.kt b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/annotations/UnlockLicenseCompatibility.kt
new file mode 100644
index 00000000..fd7439cb
--- /dev/null
+++ b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/annotations/UnlockLicenseCompatibility.kt
@@ -0,0 +1,9 @@
+package app.revanced.patches.tasker.license.unlock.annotations
+
+import app.revanced.patcher.annotation.Compatibility
+import app.revanced.patcher.annotation.Package
+
+@Compatibility([Package("net.dinglisch.android.taskerm")])
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+internal annotation class UnlockLicenseCompatibility
diff --git a/src/main/kotlin/app/revanced/patches/tasker/license/unlock/fingerprints/CheckLicenseFingerprint.kt b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/fingerprints/CheckLicenseFingerprint.kt
new file mode 100644
index 00000000..566a8389
--- /dev/null
+++ b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/fingerprints/CheckLicenseFingerprint.kt
@@ -0,0 +1,14 @@
+package app.revanced.patches.tasker.license.unlock.fingerprints
+
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import org.jf.dexlib2.Opcode
+
+object CheckLicenseFingerprint : MethodFingerprint(
+    strings = listOf("just(IsLicensedResult(true))"),
+    opcodes = listOf(
+        Opcode.GOTO,
+        Opcode.INVOKE_VIRTUAL,
+        Opcode.MOVE_RESULT_OBJECT,
+        Opcode.INVOKE_VIRTUAL
+    )
+)
\ No newline at end of file
diff --git a/src/main/kotlin/app/revanced/patches/tasker/license/unlock/patch/UnlockLicensePatch.kt b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/patch/UnlockLicensePatch.kt
new file mode 100644
index 00000000..458a4cc0
--- /dev/null
+++ b/src/main/kotlin/app/revanced/patches/tasker/license/unlock/patch/UnlockLicensePatch.kt
@@ -0,0 +1,46 @@
+package app.revanced.patches.tasker.license.unlock.patch
+
+import app.revanced.extensions.toErrorResult
+import app.revanced.patcher.annotation.Description
+import app.revanced.patcher.annotation.Name
+import app.revanced.patcher.annotation.Version
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.extensions.instruction
+import app.revanced.patcher.patch.BytecodePatch
+import app.revanced.patcher.patch.PatchResultSuccess
+import app.revanced.patcher.patch.annotations.Patch
+import app.revanced.patches.tasker.license.unlock.annotations.UnlockLicenseCompatibility
+import app.revanced.patches.tasker.license.unlock.fingerprints.CheckLicenseFingerprint
+import org.jf.dexlib2.iface.instruction.FiveRegisterInstruction
+import org.jf.dexlib2.iface.instruction.ReferenceInstruction
+import org.jf.dexlib2.iface.reference.MethodReference
+import org.jf.dexlib2.immutable.instruction.ImmutableInstruction35c
+
+@Patch
+@Name("unlock-license")
+@Description("Unlocks the trial version.")
+@UnlockLicenseCompatibility
+@Version("0.0.1")
+class UnlockLicensePatch : BytecodePatch(
+    listOf(
+        CheckLicenseFingerprint
+    )
+) {
+    override fun execute(context: BytecodeContext) = CheckLicenseFingerprint.result?.let { result ->
+        val patchIndex = result.scanResult.patternScanResult!!.endIndex
+
+        with(result.mutableMethod.instruction(patchIndex) as FiveRegisterInstruction) {
+            ImmutableInstruction35c(
+                opcode,
+                registerCount,
+                registerC,
+                0, // registerE is 1, registerD is now 0 instead of 1 bypassing the license verification
+                registerE,
+                registerF,
+                registerG,
+                (this as ReferenceInstruction).reference as MethodReference
+            )
+        }
+        PatchResultSuccess()
+    } ?: CheckLicenseFingerprint.toErrorResult()
+}
\ No newline at end of file