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VerifyAppViewModel.kt
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VerifyAppViewModel.kt
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package dev.soupslurpr.appverifier.ui
import android.app.Application
import android.content.pm.PackageInfo
import android.content.pm.PackageManager
import android.graphics.drawable.Drawable
import androidx.lifecycle.AndroidViewModel
import dev.soupslurpr.appverifier.data.Hashes
import dev.soupslurpr.appverifier.data.InternalDatabaseStatus
import dev.soupslurpr.appverifier.data.VerificationInfo
import dev.soupslurpr.appverifier.data.VerificationStatus
import dev.soupslurpr.appverifier.data.VerifyAppUiState
import dev.soupslurpr.appverifier.internalVerificationInfoDatabase
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import java.security.MessageDigest
class VerifyAppViewModel(application: Application) : AndroidViewModel(application) {
/**
* App verification info
*/
private val _uiState = MutableStateFlow(VerifyAppUiState())
val uiState: StateFlow<VerifyAppUiState> = _uiState.asStateFlow()
fun setAppVerificationInfo(
name: String,
packageName: String,
hashes: Hashes,
internalDatabaseStatus: InternalDatabaseStatus
) {
_uiState.value.name.value = name
_uiState.value.packageName.value = packageName
_uiState.value.hashes.value = hashes
_uiState.value.internalDatabaseStatus.value = internalDatabaseStatus
}
fun setAppIcon(icon: Drawable) {
_uiState.value.icon.value = icon
}
fun verifyFromText(text: String) {
_uiState.value.verificationStatus.value = parseTextToVerificationStatus(text)
}
fun getVerificationInfoText(text: String): String {
val trimmedText = text.trim().trim('"').lines().joinToString("") { it.trim().plus('\n') }
return if (trimmedText.contains('"')) {
trimmedText
.lines()
.dropLast(2)
.joinToString("") {
it
.trim()
.replace(
' ',
'\n'
)
.trim('"')
.plus('\n')
}
} else if (trimmedText.contains(' ')) {
trimmedText
.lines()
.joinToString("") {
it
.trim()
.replace(
' ',
'\n'
)
.plus('\n')
}
} else {
trimmedText
}
}
private fun parseTextToVerificationStatus(text: String): VerificationStatus {
fun parseVerificationInfoTextToVerificationStatus(verificationInfoText: String): VerificationStatus {
if (
uiState.value.hashes.value.hashes.contains(verificationInfoText.lines()[0])
|| (verificationInfoText.lines()[0].trim().iterator().run {
var convertedHash = ""
this.withIndex().forEach {
convertedHash += it.value
if (it.index % 2 != 0 && (it.index != verificationInfoText.lines()[0].trim().length.dec())) {
convertedHash += ":"
}
}
uiState.value.hashes.value.hashes.contains(convertedHash.uppercase())
})
|| uiState.value.hashes.value.hashes.contains(
verificationInfoText.lines()[0].trim() + ":" + verificationInfoText.lines()[1].trim()
)
) {
return VerificationStatus.PKG_NOT_GIVEN_BUT_SIG_HASH_MATCH
} else if (verificationInfoText.lines()[0].length == 95) {
return VerificationStatus.PKG_NOT_GIVEN_AND_SIG_HASH_NOMATCH
}
val isPackageNameMatch = verificationInfoText.lines()[0] == uiState.value.packageName.value
val verificationStatus = if (uiState.value.hashes.value.hasMultipleSigners) {
if (verificationInfoText.lines().drop(1) == uiState.value.hashes.value.hashes) {
VerificationStatus.MATCH
} else {
VerificationStatus.NOMATCH
}
} else if (verificationInfoText.lines().drop(1).any {
uiState.value.hashes.value.hashes.contains(it)
}) {
VerificationStatus.MATCH
} else {
VerificationStatus.NOMATCH
}
return if (isPackageNameMatch && (verificationStatus.ordinal == VerificationStatus.NOMATCH.ordinal)) {
VerificationStatus.PKG_MATCH_BUT_SIG_HASH_NOMATCH
} else if (!isPackageNameMatch && (verificationStatus.ordinal == VerificationStatus.MATCH.ordinal)) {
VerificationStatus.PKG_NOMATCH_BUT_SIG_HASH_MATCH
} else if (verificationStatus.ordinal == VerificationStatus.NOMATCH.ordinal) {
VerificationStatus.NOMATCH
} else if (verificationStatus.ordinal == VerificationStatus.MATCH.ordinal) {
VerificationStatus.MATCH
} else {
TODO(
"This should never happen. If it does, then make sure you accounted for any new verification " +
"statuses that can happen in this function."
)
}
}
return parseVerificationInfoTextToVerificationStatus(getVerificationInfoText(text))
}
fun getHashesFromPackageInfo(packageInfo: PackageInfo): Hashes {
val signingInfo = packageInfo.signingInfo
val hasMultipleSigners = signingInfo.hasMultipleSigners()
val signatures = if (hasMultipleSigners) {
signingInfo.apkContentsSigners
.map { signature ->
MessageDigest
.getInstance("SHA-256")
.digest(signature.toByteArray())
.joinToString(":") {
"%02x".format(it)
}
.uppercase()
}
} else {
signingInfo.signingCertificateHistory
.map { signature ->
MessageDigest
.getInstance("SHA-256")
.digest(signature.toByteArray())
.joinToString(":") {
"%02x".format(it)
}
.uppercase()
}
}
return Hashes(signatures, hasMultipleSigners)
}
fun findAndSetAppVerificationInfoFromPackageName(packageName: String, packageManager: PackageManager) {
val systemPackages = packageManager.getInstalledPackages(PackageManager.MATCH_SYSTEM_ONLY)
val userInstalledPackages = packageManager.getInstalledPackages(0)
userInstalledPackages.removeIf { userInstalledPackage ->
userInstalledPackage.packageName == systemPackages.firstOrNull {
it.packageName == userInstalledPackage.packageName
}?.packageName
}
userInstalledPackages.find { packageInfo: PackageInfo? -> packageInfo?.packageName == packageName }.run {
if (this != null) {
val packageInfo =
packageManager.getPackageInfo(this.packageName, PackageManager.GET_SIGNING_CERTIFICATES)
val hashes = getHashesFromPackageInfo(packageInfo)
setAppVerificationInfo(
packageManager.getApplicationLabel(packageInfo.applicationInfo).toString(),
packageInfo.packageName,
hashes,
getInternalDatabaseStatusFromVerificationInfo(VerificationInfo(packageName, hashes))
)
setAppIcon(packageManager.getApplicationIcon(packageInfo.applicationInfo))
} else {
setAppNotFoundOrInvalidFormat(true)
}
}
}
fun setAppNotFoundOrInvalidFormat(b: Boolean) {
_uiState.value.appNotFoundOrInvalidFormat.value = b
}
fun getInternalDatabaseStatusFromVerificationInfo(verificationInfo: VerificationInfo): InternalDatabaseStatus {
return internalVerificationInfoDatabase.run {
val packageNameMatchedInternalDatabaseVerificationInfo = try {
this.first {
it.packageName == verificationInfo.packageName
}
} catch (e: NoSuchElementException) {
return@run InternalDatabaseStatus.NOT_FOUND
}
return@run if (verificationInfo.hashes.hasMultipleSigners) { // Has multiple signers
if (packageNameMatchedInternalDatabaseVerificationInfo
.hashesList
.contains(verificationInfo.hashes)
) {
InternalDatabaseStatus.MATCH
} else {
InternalDatabaseStatus.NOMATCH
}
} else {
packageNameMatchedInternalDatabaseVerificationInfo
.hashesList
.forEach { internalDatabaseHashes ->
if (internalDatabaseHashes
.hasMultipleSigners
== verificationInfo.hashes
.hasMultipleSigners
) {
verificationInfo.hashes.hashes.forEach { hash ->
if (internalDatabaseHashes.hashes.contains(hash)) {
return@run InternalDatabaseStatus.MATCH
}
}
}
}
return InternalDatabaseStatus.NOMATCH
}
}
}
fun clearUiState() {
_uiState.value = VerifyAppUiState()
}
}