mirror of https://git.sr.ht/~oppen/ariane
255 lines
9.5 KiB
Kotlin
255 lines
9.5 KiB
Kotlin
package oppen.ariane.io.gemini
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import android.content.Context
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import androidx.core.net.toUri
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import androidx.preference.PreferenceManager
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import kotlinx.coroutines.GlobalScope
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import kotlinx.coroutines.launch
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import oppen.ariane.io.GemState
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import oppen.ariane.io.keymanager.ArianeKeyManager
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import oppen.isGemini
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import oppen.toURI
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import oppen.toUri
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import java.io.*
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import java.lang.IllegalStateException
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import java.net.ConnectException
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import java.net.URI
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import javax.net.ssl.*
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const val GEMINI_SCHEME = "gemini"
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class GeminiDatasource(private val context: Context): Datasource {
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private val prefs = PreferenceManager.getDefaultSharedPreferences(context)
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private val addressBuilder = AddressBuilder()
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private val runtimeHistory = mutableListOf<URI>()
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private var forceDownload = false
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private val arianeKeyManager = ArianeKeyManager()
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override fun request(uri: URI, onUpdate: (state: GemState) -> Unit) = request(uri, false, onUpdate)
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override fun request(uri: URI, forceDownload: Boolean, onUpdate: (state: GemState) -> Unit) {
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this.forceDownload = forceDownload
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//Any inputted uri starting with a colon is an app-specific command, eg. :prefs :settings
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if(uri.toString().startsWith(":")){
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onUpdate(GemState.AppQuery(uri))
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return
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}
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when (uri.scheme) {
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GEMINI_SCHEME -> {
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addressBuilder.set(uri.toUri())
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val cached = RuntimeCache.get(uri)
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when {
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cached != null -> {
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updateHistory(uri)
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onUpdate(GemState.ResponseGemtext(uri, cached.first, cached.second))
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return
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}
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else -> {
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onUpdate(GemState.Requesting(uri))
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GlobalScope.launch {
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geminiRequest(uri, onUpdate)
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}
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}
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}
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}
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else -> {
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val parsedUri = addressBuilder.request(uri).uri()
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if(parsedUri.isGemini()){
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val cached = RuntimeCache.get(parsedUri)
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when {
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cached != null -> {
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updateHistory(uri)
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onUpdate(GemState.ResponseGemtext(parsedUri.toURI(), cached.first, cached.second))
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}
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else -> request(parsedUri.toURI(), forceDownload, onUpdate)
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}
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}else{
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onUpdate(GemState.NotGeminiRequest(uri))
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return
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}
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}
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}
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}
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private fun geminiRequest(uri: URI, onUpdate: (state: GemState) -> Unit){
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val port = if(uri.port == -1) 1965 else uri.port
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//todo - extract and reuse this ------------------------------------------------------------
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val protocol = prefs.getString("tls_protocol", "TLS")
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println("REQ_PROTOCOL: $protocol")
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val sslContext = when (protocol) {
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"TLS_ALL" -> SSLContext.getInstance("TLS")
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else -> SSLContext.getInstance(protocol)
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}
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sslContext.init(arianeKeyManager.getFactory()?.keyManagers, DummyTrustManager.get(), null)
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val factory: SSLSocketFactory = sslContext.socketFactory
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//todo to here ----------------------------------------------------------------------------
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val socket: SSLSocket?
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try {
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socket = factory.createSocket(uri.host, port) as SSLSocket
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when (protocol) {
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"TLS" -> {}//Use default enabled protocols
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"TLS_ALL" -> socket.enabledProtocols = socket.supportedProtocols
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else -> socket.enabledProtocols = arrayOf(protocol)
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}
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println("Ariane socket handshake with ${uri.host} on port $port")
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socket.startHandshake()
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}catch (ce: ConnectException){
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println("Ariane socket error: $ce")
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onUpdate(GemState.ResponseError(GeminiResponse.Header(-1, ce.message ?: ce.toString())))
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return
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}catch (she: SSLHandshakeException){
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println("Ariane socket error: $she")
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onUpdate(GemState.ResponseError(GeminiResponse.Header(-2, she.message ?: she.toString())))
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return
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}
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// OUT >>>>>>>>>>>>>>>>>>>>>>>>>>
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val outputStreamWriter = OutputStreamWriter(socket.outputStream)
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val bufferedWriter = BufferedWriter(outputStreamWriter)
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val outWriter = PrintWriter(bufferedWriter)
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val requestEntity = uri.toString() + "\r\n"
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println("Ariane socket requesting $requestEntity")
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outWriter.print(requestEntity)
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outWriter.flush()
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if (outWriter.checkError()) {
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onUpdate(GemState.ResponseError(GeminiResponse.Header(-1, "Print Writer Error")))
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outWriter.close()
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return
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}
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// IN <<<<<<<<<<<<<<<<<<<<<<<<<<<
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val inputStream = socket.inputStream
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val headerInputReader = InputStreamReader(inputStream)
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val bufferedReader = BufferedReader(headerInputReader)
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val headerLine = bufferedReader.readLine()
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println("Ariane: response header: $headerLine")
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val header = GeminiResponse.parseHeader(headerLine)
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when {
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header.code == GeminiResponse.INPUT -> onUpdate(GemState.ResponseInput(uri, header))
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header.code == GeminiResponse.REDIRECT -> request(URI.create(header.meta), forceDownload, onUpdate)
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header.code != GeminiResponse.SUCCESS -> onUpdate(GemState.ResponseError(header))
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header.meta.startsWith("text/gemini") -> getGemtext(bufferedReader, uri, header, onUpdate)
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header.meta.startsWith("text/") -> getString(socket, uri, header, onUpdate)
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header.meta.startsWith("image/") -> getBinary(socket, uri, header, onUpdate)
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header.meta.startsWith("audio/") -> getBinary(socket, uri, header, onUpdate)
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else -> {
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//File served over Gemini but not handled in-app, eg .pdf
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if(forceDownload){
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getBinary(socket, uri, header, onUpdate)
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}else{
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onUpdate(GemState.ResponseUnknownMime(uri, header))
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}
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}
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}
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//Close input
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bufferedReader.close()
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headerInputReader.close()
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//Close output:
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outputStreamWriter.close()
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bufferedWriter.close()
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outWriter.close()
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socket.close()
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}
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private fun getGemtext(reader: BufferedReader, uri: URI, header: GeminiResponse.Header, onUpdate: (state: GemState) -> Unit){
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val lines = mutableListOf<String>()
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lines.addAll(reader.readLines())
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val processed = GemtextHelper.findCodeBlocks(lines)
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when {
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!uri.toString().startsWith("gemini://") -> throw IllegalStateException("Not a Gemini Uri")
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}
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RuntimeCache.put(uri, header, processed)
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updateHistory(uri)
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onUpdate(GemState.ResponseGemtext(uri, header, processed))
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}
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private fun updateHistory(uri: URI) {
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if (runtimeHistory.isEmpty() || runtimeHistory.last().toString() != uri.toString()) {
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runtimeHistory.add(uri)
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println("Ariane added $uri to runtime history (size ${runtimeHistory.size})")
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}
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}
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private fun getString(socket: SSLSocket?, uri: URI, header: GeminiResponse.Header, onUpdate: (state: GemState) -> Unit){
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val content = socket?.inputStream?.bufferedReader().use {
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reader -> reader?.readText()
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}
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socket?.close()
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onUpdate(GemState.ResponseText(uri, header, content ?: "Error fetching content"))
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}
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private fun getBinary(socket: SSLSocket?, uri: URI, header: GeminiResponse.Header, onUpdate: (state: GemState) -> Unit){
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var filename: String? = null
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val fileSegmentIndex: Int = uri.path.lastIndexOf('/')
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when {
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fileSegmentIndex != -1 -> filename = uri.path.substring(fileSegmentIndex + 1)
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}
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val host = uri.host.replace(".", "_")
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val cacheName = "${host}_$filename"
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println("Caching file: $filename from uri: $uri, cacheName: $cacheName")
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val cacheFile = File(context.cacheDir, cacheName)
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when {
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cacheFile.exists() -> {
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when {
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header.meta.startsWith("image/") -> onUpdate(GemState.ResponseImage(uri, header, cacheFile.toUri()))
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header.meta.startsWith("audio/") -> onUpdate(GemState.ResponseAudio(uri, header, cacheFile.toUri()))
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else -> onUpdate(GemState.ResponseBinary(uri, header, cacheFile.toUri()))
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}
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}
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else -> {
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cacheFile.createNewFile()
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cacheFile.outputStream().use{ outputStream ->
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socket?.inputStream?.copyTo(outputStream)
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socket?.close()
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}
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when {
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header.meta.startsWith("image/") -> onUpdate(GemState.ResponseImage(uri, header, cacheFile.toUri()))
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header.meta.startsWith("audio/") -> onUpdate(GemState.ResponseAudio(uri, header, cacheFile.toUri()))
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else -> onUpdate(GemState.ResponseBinary(uri, header, cacheFile.toUri()))
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}
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}
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}
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}
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override fun canGoBack(): Boolean = runtimeHistory.isEmpty() || runtimeHistory.size > 1
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override fun goBack(onUpdate: (state: GemState) -> Unit) {
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runtimeHistory.removeLast()
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request(runtimeHistory.last(), onUpdate)
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}
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} |