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Fix dynamic redirect for offline local links in Android app #41

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Merged
SayanthRock merged 1 commit into from
Aug 9, 2026
Merged

Fix dynamic redirect for offline local links in Android app #41

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6 changes: 5 additions & 1 deletion app/src/main/java/com/example/MainActivity.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,11 @@ class MainActivity : ComponentActivity() {
private fun handleIntent(intent: android.content.Intent?, viewModel: QRViewModel) {
intent?.dataString?.let { dataStr ->
if (dataStr.contains("sayanthrock.github.io/Rock-QR-Code")) {
viewModel.importFromDeepLink(dataStr)
if (dataStr.contains("/redirect?code=local_")) {
viewModel.resolveDynamicRedirect(dataStr)
} else {
viewModel.importFromDeepLink(dataStr)
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}
intent.data = null
}
}
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52 changes: 51 additions & 1 deletion app/src/main/java/com/example/viewmodel/QRViewModel.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -321,8 +321,27 @@ class QRViewModel(application: Application) : AndroidViewModel(application) {
}.sortedByDescending { it.timestamp }
}

fun saveScannedResult(content: String) {
fun saveScannedResult(rawContent: String) {
viewModelScope.launch(Dispatchers.IO) {
var content = rawContent

// Resolve local dynamic redirect codes instantly!
if (content.contains("sayanthrock.github.io/Rock-QR-Code/redirect?code=local_")) {
try {
val uri = android.net.Uri.parse(content)
val code = uri.getQueryParameter("code")
if (code != null) {
val currentRecords = repository.allHistory.first()
val record = currentRecords.find { it.shortCode == code }
if (record != null) {
content = record.content // swap redirect link for real target!
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}
}
} catch(e: Exception) {
// Ignore
}
}

val type = detectQrType(content)
val title = when (type) {
"URL" -> {
Expand All @@ -349,6 +368,37 @@ class QRViewModel(application: Application) : AndroidViewModel(application) {
}
}

fun resolveDynamicRedirect(url: String) {
viewModelScope.launch(Dispatchers.IO) {
try {
val uri = android.net.Uri.parse(url)
val code = uri.getQueryParameter("code")
if (code != null && code.startsWith("local_")) {
val currentRecords = repository.allHistory.first()
val record = currentRecords.find { it.shortCode == code }
if (record != null) {
val targetUrl = record.content
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kotlinx.coroutines.withContext(Dispatchers.Main) {
showToast("Resolved local dynamic link", CustomToastType.SUCCESS)
val intent = android.content.Intent(android.content.Intent.ACTION_VIEW, android.net.Uri.parse(targetUrl))
intent.addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK)
getApplication<android.app.Application>().startActivity(intent)
}

saveScannedResult(targetUrl)
} else {
kotlinx.coroutines.withContext(Dispatchers.Main) {
showToast("Offline link not found on this device", CustomToastType.ERROR)
}
}
}
} catch (e: Exception) {
// Ignore
}
}
}

private fun detectQrType(content: String): String {
return when {
content.startsWith("http://", ignoreCase = true) || content.startsWith("https://", ignoreCase = true) -> "URL"
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