Add initial Discord bot integration with JDA setup and environment token configuration

discord/build.gradle.kts

@@ -0,0 +1,26 @@
+plugins {
+    id("java")
+}
+
+group = "com.alttd.webinterface"
+version = "unspecified"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    // JDA
+    implementation("net.dv8tion:JDA:6.0.0-rc.2") {
+        exclude("opus-java") // exclude audio
+        exclude("tink") // exclude audio
+    }
+    compileOnly("org.projectlombok:lombok:1.18.38")
+    annotationProcessor("org.projectlombok:lombok:1.18.38")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

discord/src/main/java/com/alttd/webinterface/DiscordBot.java

@@ -0,0 +1,18 @@
+package com.alttd.webinterface;
+
+import com.alttd.webinterface.bot.DiscordBotInstance;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class DiscordBot {
+
+    public static void main(String[] args) {
+        String discordToken = System.getProperty("DISCORD_TOKEN");
+        if (discordToken == null) {
+            log.error("Discord token not found, put it in the DISCORD_TOKEN environment variable");
+            System.exit(1);
+        }
+        DiscordBotInstance discordBotInstance = new DiscordBotInstance();
+        discordBotInstance.start(discordToken);
+    }
+}

discord/src/main/java/com/alttd/webinterface/bot/DiscordBotInstance.java

@@ -0,0 +1,22 @@
+package com.alttd.webinterface.bot;
+
+import lombok.Getter;
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.JDABuilder;
+import net.dv8tion.jda.api.requests.GatewayIntent;
+
+public class DiscordBotInstance {
+
+    @Getter
+    private JDA jda;
+
+    public void start(String token) {
+        jda = JDABuilder.createDefault(token,
+                GatewayIntent.GUILD_MEMBERS,
+                GatewayIntent.GUILD_PRESENCES,
+                GatewayIntent.GUILD_MESSAGES,
+                GatewayIntent.MESSAGE_CONTENT)
+                        .build();
+    }
+
+}