Detect minified classes and skip instrumentation to avoid build problems

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Fixes
+
+- Detect minified classes and skip instrumentation to avoid build problems ([#362](https://github.com/getsentry/sentry-android-gradle-plugin/pull/362))
+
 ### Features
 
 - Bump AGP to 7.2.1 and Gradle to 7.5.0 ([#363](https://github.com/getsentry/sentry-android-gradle-plugin/pull/363))

plugin-build/src/main/kotlin/io/sentry/android/gradle/instrumentation/util/ConstantPoolHelpers.kt

@@ -44,17 +44,25 @@ internal fun ClassWriter.findClassReader(): ClassReader? {
     return (classReaderField.get(symbolTable) as? ClassReader)
 }
 
+internal fun ClassReader.getSimpleClassName(): String {
+    return className.substringAfterLast("/")
+}
+
 /**
  * Looks at the constant pool entries and searches for R8 markers
  */
 internal fun ClassReader.isMinifiedClass(): Boolean {
-    val charBuffer = CharArray(maxStringLength)
+    return isR8Minified(this) || classNameLooksMinified(this.getSimpleClassName(), this.className)
+}
+
+private fun isR8Minified(classReader: ClassReader): Boolean {
+    val charBuffer = CharArray(classReader.maxStringLength)
     // R8 marker is usually in the first 3-5 entries, so we limit it at 10 to speed it up
     // (constant pool size can be huge otherwise)
-    val poolSize = minOf(10, itemCount)
+    val poolSize = minOf(10, classReader.itemCount)
     for (i in 1 until poolSize) {
         try {
-            val constantPoolEntry = readConst(i, charBuffer)
+            val constantPoolEntry = classReader.readConst(i, charBuffer)
             if (constantPoolEntry is String && "~~R8" in constantPoolEntry) {
                 // ~~R8 is a marker in the class' constant pool, which r8 itself is looking at when
                 // parsing a .class file. See here -> https://r8.googlesource.com/r8/+/refs/heads/main/src/main/java/com/android/tools/r8/dex/Marker.java#53
@@ -68,6 +76,25 @@ internal fun ClassReader.isMinifiedClass(): Boolean {
     return false
 }
 
+/**
+ * See https://github.com/getsentry/sentry-android-gradle-plugin/issues/360
+ * and https://github.com/getsentry/sentry-android-gradle-plugin/issues/359#issuecomment-1193782500
+ */
+/* ktlint-disable max-line-length */
+private val MINIFIED_CLASSNAME_REGEX = """^(((([a-zA-z])\4{1,}|[a-zA-Z]{1,2})([0-9]{1,})?(([a-zA-Z])\7{1,})?)|([a-zA-Z]([0-9])?))(${'\\'}${'$'}((((\w)\14{1,}|[a-zA-Z]{1,2})([0-9]{1,})?(([a-zA-Z])\17{1,})?)|(\w([0-9])?)))*${'$'}""".toRegex()
+
+/**
+ * See https://github.com/getsentry/sentry/blob/c943de2afc785083554e7fdfb10c67d0c0de0f98/static/app/components/events/eventEntries.tsx#L57-L58
+ */
+private val MINIFIED_CLASSNAME_SENTRY_REGEX =
+    """^(([\w\${'$'}]\/[\w\${'$'}]{1,2})|([\w\${'$'}]{2}\/[\w\${'$'}]\/[\w\${'$'}]))(\/|${'$'})""".toRegex()
+/* ktlint-enable max-line-length */
+
+fun classNameLooksMinified(simpleClassName: String, fullClassName: String): Boolean {
+    return MINIFIED_CLASSNAME_REGEX.matches(simpleClassName) ||
+        MINIFIED_CLASSNAME_SENTRY_REGEX.matches(fullClassName)
+}
+
 /**
  * Gets all fields of the given class and its parents (if any).
  *

plugin-build/src/test/kotlin/io/sentry/android/gradle/SentryPluginWithMinifiedLibsTest.kt

@@ -23,6 +23,7 @@ class SentryPluginWithMinifiedLibsTest :
               implementation 'com.google.android.gms:play-services-mlkit-text-recognition:18.0.0'
               implementation 'com.adcolony:sdk:4.7.1'
               implementation 'com.appboy:android-sdk-ui:19.0.0'
+              implementation 'com.stripe:stripeterminal-internal-common:2.12.0'
             }
             """.trimIndent()
         )

plugin-build/src/test/kotlin/io/sentry/android/gradle/instrumentation/util/MinifiedClassDetectionTest.kt

@@ -0,0 +1,52 @@
+package io.sentry.android.gradle.instrumentation.util
+
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import org.junit.Test
+
+class MinifiedClassDetectionTest {
+
+    @Test
+    fun `detects minified class names`() {
+        val classNames = listOf(
+            "l0",
+            """a${'$'}a""",
+            "ccc017zz",
+            """ccc017zz${'$'}a""",
+            "aa",
+            "aa${'$'}a",
+            "ab",
+            "aa${'$'}ab",
+            "ab${'$'}a"
+        )
+
+        classNames.forEach {
+            assertTrue(classNameLooksMinified(it, "com/example/$it"), it)
+        }
+    }
+
+    @Test
+    fun `detects minified class names with minified package name`() {
+        val classNames = listOf(
+            """a${'$'}""",
+            "aa"
+        )
+
+        classNames.forEach {
+            assertTrue(classNameLooksMinified(it, "a/$it"), it)
+        }
+    }
+
+    @Test
+    fun `does not consider non minified classes as minified`() {
+        val classNames = listOf(
+            "ConstantPoolHelpers",
+            "FileUtil",
+            """FileUtil${"$"}Inner"""
+        )
+
+        classNames.forEach {
+            assertFalse(classNameLooksMinified(it, "com/example/$it"), it)
+        }
+    }
+}