Initial commit

src/main/kotlin/com/shr4pnel/ferretirc/net/ClientMessage.kt

@@ -0,0 +1,64 @@
+package com.shr4pnel.ferretirc.net
+
+import io.ktor.network.selector.SelectorManager
+import kotlinx.coroutines.Dispatchers
+
+/**
+ * IRC Messages sent by the client
+ */
+sealed class ClientMessage(val strName: String) {
+    abstract fun toWire(): ByteArray
+
+    companion object Util {
+        val selectorManager = SelectorManager(Dispatchers.IO)
+    }
+
+    class Ping(val token: String?) : ClientMessage("PING") {
+        init {
+            require(token?.isNotEmpty() ?: true) {
+                "Token to PING should be null or a non-empty string"
+            }
+        }
+
+        override fun toWire() = "$strName $token\r\n".encodeToByteArray()
+    }
+
+    sealed class Cap : ClientMessage("CAP") {
+        val validSubcommands = listOf("LS", "LIST", "REQ", "END")
+
+        override fun toWire() = when (this) {
+            is LS -> "CAP LS $version\r\n".encodeToByteArray()
+            is REQ -> TODO()
+        }
+
+        class LS(val version: Int = 302) : Cap() {
+            val subcommand = "LS"
+        }
+
+        class REQ(val version: Int?) : Cap() {
+            val subcommand = "REQ"
+        }
+
+        class END {
+            val subcommand = "END"
+        }
+
+//        init {
+//            require(validSubcommands.contains(subcommand.toUpperCasePreservingASCIIRules())) {
+//                "$subcommand is not a valid subcommand to CAP"
+//            }
+//        }
+    }
+
+    class Nick(val nickname: String) : ClientMessage("NICK") {
+        override fun toWire() = "NICK $nickname\r\n".encodeToByteArray()
+
+        init {
+            require(nickname.length < 10) { "\"$nickname\" exceeds IRCs maximum nickname length of 9" }
+            require(!nickname.startsWith(":") && !nickname.startsWith("#")) { "\"$nickname\" may not begin with : or #" } // TODO THIS SHOULD BLACKLIST ALL PREFIXES NAMED IN CHANTYPES PARAMETER
+            require(!nickname.contains(" ")) { "$nickname may not contain a space" }
+        }
+    }
+
+
+}

src/main/kotlin/com/shr4pnel/ferretirc/net/Connection.kt

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+package com.shr4pnel.ferretirc.net
+
+import io.ktor.network.sockets.Socket
+import io.ktor.network.sockets.aSocket
+import kotlinx.coroutines.CoroutineScope
+
+class Connection(val hostname: String, val port: Int, val scope: CoroutineScope) {
+    private val socketBuilder = aSocket(ClientMessage.selectorManager).tcp()
+    lateinit var socket: Socket
+    lateinit var reader: MessageReader
+    lateinit var writer: MessageWriter
+
+    suspend fun connect() {
+        socket = socketBuilder.connect(hostname, port)
+        reader = MessageReader(socket, scope)
+        writer = MessageWriter(socket, scope)
+        reader.start()
+        writer.start()
+    }
+}

src/main/kotlin/com/shr4pnel/ferretirc/net/MessageIO.kt

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+package com.shr4pnel.ferretirc.net
+
+import io.ktor.network.sockets.Socket
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.channels.Channel
+
+abstract class MessageIO(val socket: Socket, val scope: CoroutineScope) {
+    val incomingMessages = Channel<String>(Channel.BUFFERED)
+    val outgoingMessages = Channel<ClientMessage>(Channel.BUFFERED)
+
+    abstract suspend fun start()
+}

src/main/kotlin/com/shr4pnel/ferretirc/net/MessageReader.kt

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+package com.shr4pnel.ferretirc.net
+
+import io.ktor.network.sockets.Socket
+import io.ktor.network.sockets.openReadChannel
+import io.ktor.utils.io.ByteReadChannel
+import io.ktor.utils.io.readLineStrict
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+class MessageReader(socket: Socket, scope: CoroutineScope): MessageIO(socket, scope) {
+    private lateinit var receive: ByteReadChannel
+
+    override suspend fun start() {
+        receive = socket.openReadChannel()
+        scope.launch {
+            while (true) {
+                val line = receive.readLineStrict() ?: break // >:( no LineEnding option for just CRLF? charlatans...
+                incomingMessages.send(line)
+            }
+        }
+    }
+}

src/main/kotlin/com/shr4pnel/ferretirc/net/MessageWriter.kt

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+package com.shr4pnel.ferretirc.net
+
+import io.ktor.network.sockets.Socket
+import io.ktor.network.sockets.openWriteChannel
+import io.ktor.utils.io.ByteWriteChannel
+import io.ktor.utils.io.writeFully
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+
+class MessageWriter(socket: Socket, scope: CoroutineScope): MessageIO(socket, scope) {
+    private lateinit var send: ByteWriteChannel
+
+    override suspend fun start() {
+        send = socket.openWriteChannel()
+        scope.launch {
+            for (msg in outgoingMessages) {
+                send.writeFully(msg.toWire())
+                send.flush()
+            }
+        }
+    }
+}