Initial commit

.gitignore

@@ -0,0 +1,46 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Kotlin ###
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+/.idea/

bl-client/build.gradle.kts

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+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    kotlin("multiplatform")
+    kotlin("plugin.serialization")
+}
+
+kotlin {
+    explicitApi()
+
+    linuxX64()
+    linuxArm64()
+    macosArm64()
+    mingwX64()
+    jvm { compilerOptions.jvmTarget = JvmTarget.JVM_11 }
+
+    sourceSets {
+        val ktorVersion = "3.5.2"
+        commonMain.dependencies {
+            api(project(":bl-core"))
+            implementation("io.ktor:ktor-client-core:$ktorVersion")
+            implementation("io.ktor:ktor-client-cio:$ktorVersion")
+            implementation("io.ktor:ktor-client-websockets:$ktorVersion")
+        }
+
+        commonTest.dependencies {
+            implementation(project(":bl-core"))
+        }
+    }
+}

bl-core/build.gradle.kts

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+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    kotlin("multiplatform")
+    kotlin("plugin.serialization")
+}
+
+kotlin {
+    explicitApi()
+
+    linuxX64()
+    linuxArm64()
+    macosArm64()
+    mingwX64()
+    jvm { compilerOptions.jvmTarget = JvmTarget.JVM_11 }
+
+    sourceSets {
+        commonMain.dependencies {
+            api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.11.0")
+            api("org.kotlincrypto.hash:md:0.8.0")
+            api("org.jetbrains.kotlinx:kotlinx-io-core:0.9.1")
+        }
+
+        commonTest.dependencies {
+            implementation(kotlin("test"))
+            implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.11.0")
+        }
+    }
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/constant.kt

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+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/29
+ */
+
+package cn.rtast.bldm.core
+
+public const val REAL_ROOM_ID_URL: String = "https://api.live.bilibili.com/room/v1/Room/room_init?id="
+public const val DM_SERVER_CONF_URL: String = "https://api.live.bilibili.com/xlive/web-room/v1/index/getDanmuInfo?id="
+public const val USER_NAV_URL: String = "https://api.bilibili.com/x/web-interface/nav"

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/data/DMServerConf.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/29
+ */
+
+
+package cn.rtast.bldm.core.data
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.Transient
+
+@Serializable
+public data class DMServerConf(
+    val data: ServerConf,
+) {
+    @Serializable
+    public data class ServerConf(
+        val token: String,
+        @SerialName("host_list")
+        val hostList: List<ServerHost>,
+    )
+
+    @Serializable
+    public data class ServerHost(
+        val host: String,
+        val port: Int,
+        @SerialName("wss_port")
+        val wssPort: Int,
+        @SerialName("ws_port")
+        val wsPort: Int,
+    )
+
+    @Transient
+    public val defaultServerHost: ServerHost = ServerHost("broadcastlv.chat.bilibili.com", 2243, 2245, 2244)
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/data/RealRoomId.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/29
+ */
+
+
+package cn.rtast.bldm.core.data
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+public data class RealRoomId(
+    val data: RoomId
+) {
+    @Serializable
+    public data class RoomId(
+        @SerialName("room_id")
+        val roomId: Long
+    )
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/data/UserNavData.kt

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+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+@file:OptIn(ExperimentalUnsignedTypes::class)
+
+package cn.rtast.bldm.core.data
+
+import cn.rtast.bldm.core.util.digest
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlin.time.Clock
+
+@Serializable
+public data class UserNavData(
+    @SerialName("wbi_img")
+    val wbiImg: WbiImg,
+) {
+    @Serializable
+    public data class WbiImg(
+        @SerialName("img_url")
+        val imgUrl: String,
+        @SerialName("sub_url")
+        val subUrl: String,
+    )
+
+    private companion object {
+        val MIXIN_KEY_ENC_TAB = intArrayOf(
+            46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49,
+            33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40,
+            61, 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63, 57, 62, 11,
+            36, 20, 34, 44, 52
+        )
+
+        fun String.encodeURIComponent(): String {
+            val bytes = this.encodeToByteArray()
+            val sb = StringBuilder()
+            for (b in bytes) {
+                val c = b.toInt().and(0xFF).toChar()
+                if (c in 'A'..'Z' || c in 'a'..'z' || c in '0'..'9' || c == '-' || c == '_' || c == '.' || c == '~') {
+                    sb.append(c)
+                } else {
+                    val hex = (b.toInt() and 0xFF).toString(16).uppercase()
+                    sb.append('%')
+                    if (hex.length == 1) sb.append('0')
+                    sb.append(hex)
+                }
+            }
+            return sb.toString()
+        }
+
+        fun Map<String, Any?>.toQueryString(): String {
+            return this.mapNotNull { (key, value) ->
+                if (value != null) {
+                    "${key.encodeURIComponent()}=${value.toString().encodeURIComponent()}"
+                } else {
+                    null
+                }
+            }.joinToString("&")
+        }
+    }
+
+    /**
+     * get resorted mixin key
+     */
+    private fun getMixinKey(): String =
+        (wbiImg.imgUrl.substringAfterLast('/').removeSuffix(".png") +
+                wbiImg.subUrl.substringAfterLast('/').removeSuffix(".png")).let { s ->
+            buildString { repeat(32) { append(s[MIXIN_KEY_ENC_TAB[it]]) } }
+        }
+
+    public fun signWbi(room: Long): String {
+//        val payload = _wbi_sign_payload(room, 0, Clock.System.now().epochSeconds)  // ref
+        val wts = Clock.System.now().epochSeconds
+        val params = mapOf("id" to room, "type" to 0)
+            .entries.sortedBy { it.key }.associate { it.key to it.value }.toMutableMap()
+        return buildString {
+            append(params.toQueryString())
+            params["wts"] = wts
+            append("&wts=$wts")
+            append("&w_rid=${(params.toQueryString() + getMixinKey()).digest()}")
+        }
+    }
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/data/_wbi_sign_payload.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.data
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+@Suppress("ClassName")
+internal data class _wbi_sign_payload(
+    /**
+     * room id
+     */
+    val id: Long,
+    /**
+     * always be 0
+     */
+    val type: Int,
+    /**
+     * current unix timestamp (seconds)
+     */
+    val wts: Long
+)

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/data/protocol/AuthPayload.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.data.protocol
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+internal data class AuthPayload(
+    /**
+     * user id
+     */
+    val uid: Int,
+    /**
+     * room id
+     */
+    val roomid: Long,
+    /**
+     * protocol version
+     * always be 2
+     */
+    val protover: Int,
+    /**
+     * device id
+     */
+    val buvid: String,
+    /**
+     * platform always be "web"
+     */
+    val platform: String,
+    /**
+     * always be 2
+     */
+    val type: Int,
+    /**
+     * token
+     */
+    val key: String
+)

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/protocol/Packet.kt

@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.protocol
+
+import kotlinx.io.Buffer
+import kotlinx.io.readByteArray
+
+/**
+ * packet header 16 bytes length + body (variant length)
+ */
+public data class Packet(
+    /**
+     * total packet length
+     * 4 bytes
+     */
+    val packetLength: Int = -1,
+    /**
+     * always 16
+     * 2 bytes
+     */
+    val headerLength: Short = 16,
+    /**
+     * protocol = 1
+     * 2 bytes
+     */
+    val protocolVersion: Short = 1,
+    /**
+     * packet type
+     * 4 bytes
+     */
+    val packetType: Int,
+    /**
+     * packet sequence
+     * value is usually 1
+     * 4 bytes
+     */
+    val sequence: Int = 1,
+    /**
+     * packet body
+     * variant length
+     */
+    val body: ByteArray,
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as Packet
+
+        if (packetLength != other.packetLength) return false
+        if (headerLength != other.headerLength) return false
+        if (protocolVersion != other.protocolVersion) return false
+        if (packetType != other.packetType) return false
+        if (sequence != other.sequence) return false
+        if (!body.contentEquals(other.body)) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = packetLength
+        result = 31 * result + headerLength
+        result = 31 * result + protocolVersion
+        result = 31 * result + packetType
+        result = 31 * result + sequence
+        result = 31 * result + body.contentHashCode()
+        return result
+    }
+
+    public fun toByteArray(): ByteArray = Buffer().apply {
+        writeInt(16 + body.size)
+        writeShort(headerLength)
+        writeShort(protocolVersion)
+        writeInt(packetType)
+        writeInt(sequence)
+        write(body, body.size)
+    }.readByteArray()
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/protocol/PacketDecoder.kt

@@ -0,0 +1,11 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.protocol
+
+class PacketDecoder {
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/protocol/PacketEncoder.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.protocol
+
+import cn.rtast.bldm.core.data.protocol.AuthPayload
+import cn.rtast.bldm.core.util.AutoIncrementInt
+import cn.rtast.bldm.core.util.encodeJson
+
+public class PacketEncoder {
+    public companion object {
+        private val HEARTBEAT_BODY: ByteArray = "[Object object]".encodeToByteArray()
+    }
+
+    private val _sequence by AutoIncrementInt()
+
+    public fun authPacket(uid: Int, roomId: Long, buvid: String, token: String): Packet {
+        val payload = AuthPayload(uid, roomId, 2, buvid, "web", 2, token)
+            .encodeJson().encodeToByteArray()
+        return Packet(packetType = PacketType.AUTH, sequence = _sequence, body = payload)
+    }
+
+    public fun heartbeatPacket(): Packet = Packet(packetType = 2, sequence = _sequence, body = HEARTBEAT_BODY)
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/protocol/PacketType.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.protocol
+
+public object PacketType {
+    public const val AUTH: Int = 7
+    public const val AUTH_REPLY: Int = 8
+    public const val HEARTBEAT: Int = 2
+    public const val HANDSHAKE_REPLY: Int = 1
+    public const val HEARTBEAT_REPLY: Int = 3
+    public const val SEND_MSG_REPLY: Int = 5
+    // TODO
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/util/AutoIncrementInt.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.util
+
+import kotlin.reflect.KProperty
+
+internal class AutoIncrementInt(initialValue: Int = 1) {
+    private var count = initialValue
+
+    operator fun getValue(thisRef: Any?, property: KProperty<*>): Int {
+        return ++count
+    }
+}

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/util/_md5.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.util
+
+import org.kotlincrypto.hash.md.MD5
+
+internal val md5Instance = MD5()
+
+internal fun String.digest(): String = md5Instance.digest(this.encodeToByteArray()).toHexString()

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/util/json.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.util
+
+import kotlinx.serialization.json.Json
+
+internal inline fun <reified T> String.fromJson(): T = Json.decodeFromString(this)
+
+internal inline fun <reified T> T.encodeJson(): String = Json.encodeToString(this)

bl-core/src/commonMain/kotlin/cn/rtast/bldm/core/util/zlib.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.util
+
+internal expect fun ByteArray.zlibDecompress(): ByteArray

bl-core/src/commonTest/kotlin/test/TestMd5.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package test
+
+import org.kotlincrypto.hash.md.MD5
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class TestMd5 {
+
+    @Test
+    fun `test md5`() {
+        val target = "e10adc3949ba59abbe56e057f20f883e"  // 123456
+
+        val res = MD5().digest("123456".encodeToByteArray()).toHexString()
+
+        assertEquals(target, res)
+    }
+}

bl-core/src/commonTest/kotlin/test/TestWbiSign.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package test
+
+import cn.rtast.bldm.core.data.UserNavData
+import kotlin.test.Test
+
+class TestWbiSign {
+
+    @Test
+    fun `test wbi sign`() {
+        val imgUrl = "https://i0.hdslb.com/bfs/wbi/7cd084941338484aae1ad9425b84077c.png"
+        val subUrl = "https://i0.hdslb.com/bfs/wbi/4932caff0ff746eab6f01bf08b70ac45.png"
+        val signWbi = UserNavData(UserNavData.WbiImg(imgUrl, subUrl)).signWbi(27245513)
+        println(signWbi)
+    }
+}

bl-core/src/jvmMain/kotlin/cn/rtast/bldm/core/util/zlib.jvm.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+package cn.rtast.bldm.core.util
+
+import java.io.ByteArrayOutputStream
+import java.util.zip.Inflater
+
+public actual fun ByteArray.zlibDecompress(): ByteArray {
+    val inflater = Inflater(true)
+    val outputStream = ByteArrayOutputStream(this.size)
+    val buffer = ByteArray(1024)
+    inflater.setInput(this)
+    while (!inflater.finished()) {
+        val length = inflater.inflate(buffer)
+        if (length > 0) outputStream.write(buffer, 0, length)
+    }
+    inflater.end()
+    return outputStream.toByteArray()
+}

bl-core/src/nativeMain/kotlin/cn/rtast/bldm/core/util/zlib.native.kt

@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/8/30
+ */
+
+
+@file:OptIn(ExperimentalForeignApi::class)
+
+package cn.rtast.bldm.core.util
+
+import kotlinx.cinterop.*
+import platform.zlib.*
+
+private const val MAX_WBITS = 15
+
+public actual fun ByteArray.zlibDecompress(): ByteArray {
+    if (isEmpty()) return ByteArray(0)
+    return memScoped {
+        val stream = alloc<z_stream>()
+        stream.zalloc = null
+        stream.zfree = null
+        stream.opaque = null
+        check(inflateInit2_(stream.ptr, MAX_WBITS, ZLIB_VERSION, sizeOf<z_stream>().toInt()) == Z_OK) { "inflateInit2_ failed" }
+
+        val inputPinned = this@zlibDecompress.pin()
+        try {
+            stream.next_in = inputPinned.addressOf(0).reinterpret()
+            stream.avail_in = this@zlibDecompress.size.toUInt()
+
+            val bufferSize = 4096
+            val tempBuffer = ByteArray(bufferSize)
+            val tempPinned = tempBuffer.pin()
+            val output = ArrayList<Byte>(this@zlibDecompress.size * 2)
+
+            try {
+                do {
+                    stream.next_out = tempPinned.addressOf(0).reinterpret()
+                    stream.avail_out = bufferSize.toUInt()
+
+                    val result = inflate(stream.ptr, Z_NO_FLUSH)
+                    check(result == Z_OK || result == Z_STREAM_END) { "inflate error: $result" }
+
+                    val bytesDecompressed = bufferSize - stream.avail_out.toInt()
+                    for (i in 0 until bytesDecompressed) {
+                        output.add(tempBuffer[i])
+                    }
+
+                    if (result == Z_STREAM_END) break
+                } while (stream.avail_out == 0u)
+            } finally {
+                tempPinned.unpin()
+            }
+
+            inflateEnd(stream.ptr)
+            return@memScoped output.toByteArray()
+        } finally {
+            inputPinned.unpin()
+        }
+    }
+}

build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    kotlin("multiplatform") version "2.4.10" apply false
+    kotlin("plugin.serialization") version "2.4.10" apply false
+}
+
+allprojects {
+    group = "cn.rtast.bldm"
+    version = "1.0-SNAPSHOT"
+
+    repositories {
+        mavenCentral()
+    }
+}

gradle.properties

@@ -0,0 +1,3 @@
+kotlin.code.style=official
+org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=1024m -XX:+HeapDumpOnOutOfMemoryError
+kotlin.native.ignoreDisabledTargets=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Aug 29 23:35:21 CST 2026
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.5-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,4 @@
+rootProject.name = "bldm"
+
+include(":bl-core")
+include(":bl-client")