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Dynamically generate component names at runtime

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This commit is contained in:
topjohnwu
2022-08-26 06:20:10 -07:00
parent 71b0c8b42b
commit 357d913f18
5 changed files with 143 additions and 61 deletions
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87
buildSrc/src/main/java/Codegen.kt
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@ -82,7 +82,7 @@ fun genStubManifest(srcDir: File, outDir: File): String {
cmpList.add(
"""
|<provider
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_0"
| android:authorities="${'$'}{applicationId}.provider"
| android:directBootAware="true"
| android:exported="false"
@ -92,7 +92,7 @@ fun genStubManifest(srcDir: File, outDir: File): String {
cmpList.add(
"""
|<receiver
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_1"
| android:exported="false">
| <intent-filter>
| <action android:name="android.intent.action.LOCALE_CHANGED" />
@ -111,7 +111,7 @@ fun genStubManifest(srcDir: File, outDir: File): String {
cmpList.add(
"""
|<activity
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_2"
| android:exported="true">
| <intent-filter>
| <action android:name="android.intent.action.MAIN" />
@ -123,7 +123,7 @@ fun genStubManifest(srcDir: File, outDir: File): String {
cmpList.add(
"""
|<activity
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_3"
| android:directBootAware="true"
| android:exported="false"
| android:taskAffinity=""
@ -138,56 +138,49 @@ fun genStubManifest(srcDir: File, outDir: File): String {
cmpList.add(
"""
|<service
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_4"
| android:exported="false" />""".ind(2)
)
cmpList.add(
"""
|<service
| android:name="%s"
| android:name="x.COMPONENT_PLACEHOLDER_5"
| android:exported="false"
| android:permission="android.permission.BIND_JOB_SERVICE" />""".ind(2)
)
val names = mutableListOf<String>()
names.addAll(c1)
names.addAll(c2.subList(0, 10))
names.addAll(c3.subList(0, 10))
names.shuffle(RANDOM)
val classNameGenerator = sequence {
fun notJavaKeyword(name: String) = when (name) {
"do", "if", "for", "int", "new", "try" -> false
else -> true
}
val pkgNames = names
// Distinct by lower case to support case insensitive file systems
.distinctBy { it.toLowerCase(Locale.ROOT) }
// Old Android does not support capitalized package names
// Check Android 7.0.0 PackageParser#buildClassName
.map { it.decapitalize(Locale.ROOT) }
fun List<String>.process() = asSequence()
.filter(::notJavaKeyword)
// Distinct by lower case to support case insensitive file systems
.distinctBy { it.toLowerCase(Locale.ROOT) }
fun isJavaKeyword(name: String) = when (name) {
"do", "if", "for", "int", "new", "try" -> true
else -> false
}
val names = mutableListOf<String>()
names.addAll(c1)
names.addAll(c2.process().take(30))
names.addAll(c3.process().take(30))
names.shuffle(RANDOM)
val cmps = mutableListOf<String>()
val usedNames = mutableListOf<String>()
while (true) {
val cls = StringBuilder()
cls.append(names.random(kRANDOM))
cls.append('.')
cls.append(names.random(kRANDOM))
// Old Android does not support capitalized package names
// Check Android 7.0.0 PackageParser#buildClassName
cls[0] = cls[0].toLowerCase()
yield(cls.toString())
}
}.distinct().iterator()
fun genCmpName(): String {
var pkgName: String
do {
pkgName = pkgNames.random(kRANDOM)
} while (isJavaKeyword(pkgName))
var clzName: String
do {
clzName = names.random(kRANDOM)
} while (isJavaKeyword(clzName))
val cmp = "${pkgName}.${clzName}"
usedNames.add(cmp)
return cmp
}
fun genClass(type: String) {
val clzName = genCmpName()
fun genClass(type: String): String {
val clzName = classNameGenerator.next()
val (pkg, name) = clzName.split('.')
val pkgDir = File(outDir, pkg)
pkgDir.mkdirs()
@ -195,22 +188,18 @@ fun genStubManifest(srcDir: File, outDir: File): String {
it.println("package $pkg;")
it.println("public class $name extends com.topjohnwu.magisk.$type {}")
}
return clzName
}
// Generate 2 non redirect-able classes
genClass("DelegateComponentFactory")
genClass("DelegateApplication")
for (gen in cmpList) {
val name = genCmpName()
cmps.add(gen.format(name))
}
val factory = genClass("DelegateComponentFactory")
val app = genClass("DelegateApplication")
// Shuffle the order of the components
cmps.shuffle(RANDOM)
cmpList.shuffle(RANDOM)
val xml = File(srcDir, "AndroidManifest.xml").readText()
return xml.format(usedNames[0], usedNames[1], cmps.joinToString("\n\n"))
return xml.format(factory, app, cmpList.joinToString("\n\n"))
}
fun genEncryptedResources(res: InputStream, outDir: File) {