It works!

README.md

@@ -1,2 +1,6 @@
 # Tether
-An API designed to provide real-time access to a user's Discord data.
+An API designed to provide real-time access to a user's Discord data.
+
+## TODO
+- [ ] Caching
+- [ ] User account for extra account? (about me, connections, etc)

pom.xml

@@ -3,6 +3,12 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.3.2</version>
+        <relativePath/>
+    </parent>
 
     <!-- Project Details -->
     <groupId>me.braydon</groupId>
@@ -13,6 +19,8 @@
     <!-- Properties -->
     <properties>
         <java.version>21</java.version>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
@@ -59,6 +67,17 @@
             <version>1.18.34</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>net.dv8tion</groupId>
+            <artifactId>JDA</artifactId>
+            <version>5.1.0</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>club.minnced</groupId>
+                    <artifactId>opus-java</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
         <dependency>
             <groupId>com.github.ben-manes.caffeine</groupId>
             <artifactId>caffeine</artifactId>

src/main/java/me/braydon/tether/Tether.java

@@ -1,10 +1,36 @@
 package me.braydon.tether;
 
+import lombok.NonNull;
+import lombok.SneakyThrows;
+import lombok.extern.log4j.Log4j2;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+import java.util.Objects;
+
 /**
  * @author Braydon
  */
-public final class Tether {
-    public static void main(String[] args) {
+@SpringBootApplication
+@Log4j2(topic = "Tether")
+public class Tether {
+    @SneakyThrows
+    public static void main(@NonNull String[] args) {
+        // Load the application.yml configuration file
+        File config = new File("application.yml");
+        if (!config.exists()) { // Saving the default config if it doesn't exist locally
+            Files.copy(Objects.requireNonNull(Tether.class.getResourceAsStream("/application.yml")), config.toPath(), StandardCopyOption.REPLACE_EXISTING);
+            log.info("Saved the default configuration to '{}', please re-launch the application",
+                    config.getAbsolutePath()
+            );
+            return;
+        }
+        log.info("Found configuration at '{}'", config.getAbsolutePath());
 
+        // Start the app
+        SpringApplication.run(Tether.class, args);
     }
 }

src/main/java/me/braydon/tether/common/EnvironmentUtils.java

@@ -0,0 +1,19 @@
+package me.braydon.tether.common;
+
+import lombok.Getter;
+import lombok.experimental.UtilityClass;
+
+/**
+ * @author Braydon
+ */
+@UtilityClass
+public final class EnvironmentUtils {
+    /**
+     * Is the app running in a production environment?
+     */
+    @Getter private static final boolean production;
+    static {
+        String appEnv = System.getenv("APP_ENV");
+        production = appEnv != null && (appEnv.equals("production"));
+    }
+}

src/main/java/me/braydon/tether/controller/AppController.java

@@ -0,0 +1,47 @@
+package me.braydon.tether.controller;
+
+import lombok.NonNull;
+import me.braydon.tether.common.EnvironmentUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.info.BuildProperties;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+/**
+ * The root controller for this app.
+ *
+ * @author Braydon
+ */
+@RestController
+@RequestMapping(value = "/", produces = MediaType.APPLICATION_JSON_VALUE)
+public final class AppController {
+    /**
+     * The build properties for this app, null if not available.
+     */
+    private final BuildProperties buildProperties;
+
+    @Autowired
+    public AppController(BuildProperties buildProperties) {
+        this.buildProperties = buildProperties;
+    }
+
+    /**
+     * A GET endpoint to get info about this app.
+     *
+     * @return the info response
+     */
+    @GetMapping @ResponseBody @NonNull
+    public ResponseEntity<Map<String, String>> getAppInfo() {
+        return ResponseEntity.ok(Map.of(
+                "app", buildProperties == null ? "N/A" : buildProperties.getName(),
+                "version", buildProperties == null ? "N/A" : buildProperties.getVersion(),
+                "environment", EnvironmentUtils.isProduction() ? "production" : "staging"
+        ));
+    }
+}

src/main/java/me/braydon/tether/controller/UserController.java

@@ -0,0 +1,43 @@
+package me.braydon.tether.controller;
+
+import lombok.NonNull;
+import me.braydon.tether.exception.impl.BadRequestException;
+import me.braydon.tether.exception.impl.ResourceNotFoundException;
+import me.braydon.tether.exception.impl.ServiceUnavailableException;
+import me.braydon.tether.model.response.DiscordUserResponse;
+import me.braydon.tether.service.DiscordService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * This controller is responsible for
+ * handling Discord user related requests.
+ *
+ * @author Braydon
+ */
+@RestController
+@RequestMapping(value = "/user", produces = MediaType.APPLICATION_JSON_VALUE)
+public final class UserController {
+    @NonNull private final DiscordService discordService;
+
+    @Autowired
+    public UserController(@NonNull DiscordService discordService) {
+        this.discordService = discordService;
+    }
+
+    /**
+     * A GET endpoint to get info about a
+     * Discord user by their snowflake.
+     *
+     * @param snowflake the user snowflake
+     * @return the retrieved user
+     */
+    @GetMapping("/{snowflake}") @ResponseBody @NonNull
+    public ResponseEntity<DiscordUserResponse> getUserBySnowflake(@PathVariable @NonNull String snowflake)
+            throws BadRequestException, ServiceUnavailableException, ResourceNotFoundException
+    {
+        return ResponseEntity.ok(discordService.getUserBySnowflake(snowflake));
+    }
+}

src/main/java/me/braydon/tether/exception/ExceptionController.java

@@ -0,0 +1,38 @@
+package me.braydon.tether.exception;
+
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.NonNull;
+import me.braydon.tether.model.ErrorResponse;
+import org.springframework.boot.autoconfigure.web.servlet.error.AbstractErrorController;
+import org.springframework.boot.web.error.ErrorAttributeOptions;
+import org.springframework.boot.web.servlet.error.ErrorAttributes;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+/**
+ * The route to handle errors for this app.
+ *
+ * @author Braydon
+ */
+@RestController
+@RequestMapping(value = "/error", produces = MediaType.APPLICATION_JSON_VALUE)
+public final class ExceptionController extends AbstractErrorController {
+    public ExceptionController(@NonNull ErrorAttributes errorAttributes) {
+        super(errorAttributes);
+    }
+    
+    @RequestMapping @ResponseBody @NonNull
+    public ResponseEntity<ErrorResponse> onError(@NonNull HttpServletRequest request) {
+        Map<String, Object> error = getErrorAttributes(request, ErrorAttributeOptions.of(
+                ErrorAttributeOptions.Include.MESSAGE
+        ));
+        HttpStatus status = getStatus(request); // The status code
+        return new ResponseEntity<>(new ErrorResponse(status, (String) error.get("message")), status);
+    }
+}

src/main/java/me/braydon/tether/exception/impl/BadRequestException.java

@@ -0,0 +1,18 @@
+package me.braydon.tether.exception.impl;
+
+import lombok.NonNull;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * This exception is raised
+ * when a bad request is made.
+ *
+ * @author Braydon
+ */
+@ResponseStatus(HttpStatus.BAD_REQUEST)
+public final class BadRequestException extends RuntimeException {
+    public BadRequestException(@NonNull String message) {
+        super(message);
+    }
+}

src/main/java/me/braydon/tether/exception/impl/ResourceNotFoundException.java

@@ -0,0 +1,18 @@
+package me.braydon.tether.exception.impl;
+
+import lombok.NonNull;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * This exception is raised
+ * when a resource is not found.
+ *
+ * @author Braydon
+ */
+@ResponseStatus(HttpStatus.NOT_FOUND)
+public final class ResourceNotFoundException extends RuntimeException {
+    public ResourceNotFoundException(@NonNull String message) {
+        super(message);
+    }
+}

src/main/java/me/braydon/tether/exception/impl/ServiceUnavailableException.java

@@ -0,0 +1,20 @@
+package me.braydon.tether.exception.impl;
+
+import lombok.NonNull;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * This exception is raised when a
+ * service is unavailable. Such as
+ * when trying to interact with Discord
+ * and the bot is not connected.
+ *
+ * @author Braydon
+ */
+@ResponseStatus(HttpStatus.SERVICE_UNAVAILABLE)
+public final class ServiceUnavailableException extends RuntimeException {
+    public ServiceUnavailableException(@NonNull String message) {
+        super(message);
+    }
+}

src/main/java/me/braydon/tether/model/DiscordUser.java

@@ -0,0 +1,180 @@
+package me.braydon.tether.model;
+
+import lombok.*;
+import net.dv8tion.jda.api.OnlineStatus;
+import net.dv8tion.jda.api.entities.*;
+
+import java.text.SimpleDateFormat;
+import java.time.OffsetDateTime;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A model of a Discord user.
+ *
+ * @author Braydon
+ */
+@AllArgsConstructor @Getter @EqualsAndHashCode(onlyExplicitlyIncluded = true) @ToString
+public final class DiscordUser {
+    /**
+     * The unique snowflake of this user.
+     */
+    @EqualsAndHashCode.Include private final long snowflake;
+
+    /**
+     * The username of this user.
+     */
+    @NonNull private final String username;
+
+    /**
+     * The display name of this user, if any.
+     */
+    private final String displayName;
+
+    /**
+     * The flags of this user.
+     */
+    @NonNull private final UserFlags flags;
+
+    /**
+     * The avatar of this user.
+     */
+    @NonNull private final Avatar avatar;
+
+    /**
+     * The banner of this user, if any.
+     */
+    private final Banner banner;
+
+    /**
+     * The accent color of this user.
+     */
+    @NonNull private final String accentColor;
+
+    /**
+     * The online status of this user, if known.
+     */
+    private final OnlineStatus onlineStatus;
+
+    /**
+     * The clients this user is active on, if known.
+     */
+    private final EnumSet<ClientType> activeClients;
+
+    /**
+     * The activities of this user, if known.
+     */
+    private final List<Activity> activities;
+
+    /**
+     * The Spotify activity of this user, if known.
+     */
+    private final SpotifyActivity spotify;
+
+    /**
+     * Is this user a bot?
+     */
+    private final boolean bot;
+
+    /**
+     * The user creation date.
+     */
+    @NonNull private final OffsetDateTime createdAt;
+
+    /**
+     * Builds a Discord user from the
+     * raw entities returned from Discord.
+     *
+     * @param user the raw user entity
+     * @param profile the raw profile entity
+     * @param member the raw member entity, if any
+     * @return the built user
+     */
+    @NonNull
+    public static DiscordUser buildFromEntity(@NonNull User user, @NonNull User.Profile profile, Member member) {
+        Avatar avatar = new Avatar(user.getAvatarId() == null ? user.getDefaultAvatarId() : user.getAvatarId(), user.getEffectiveAvatarUrl());
+        Banner banner = profile.getBannerId() == null || profile.getBannerUrl() == null ? null : new Banner(profile.getBannerId(), profile.getBannerUrl());
+        String accentColor = String.format("#%06X", (0xFFFFFF & profile.getAccentColorRaw()));
+
+        OnlineStatus onlineStatus = member == null ? null : member.getOnlineStatus();
+        EnumSet<ClientType> activeClients = member == null ? null : member.getActiveClients();
+        List<Activity> activities = member == null ? null : member.getActivities();
+        SpotifyActivity spotify = null;
+        if (activities != null) {
+            for (Activity activity : activities) {
+                if (!activity.getName().equals("Spotify") || !activity.isRich()) {
+                    continue;
+                }
+                spotify = SpotifyActivity.fromActivity(Objects.requireNonNull(activity.asRichPresence()));
+                break;
+            }
+        }
+        return new DiscordUser(
+                user.getIdLong(), user.getName(), user.getGlobalName(), new UserFlags(user.getFlags(), user.getFlagsRaw()),
+                avatar, banner, accentColor, onlineStatus, activeClients, activities, spotify, user.isBot(), user.getTimeCreated()
+        );
+    }
+
+    /**
+     * A user's flags.
+     */
+    @AllArgsConstructor @Getter
+    public static class UserFlags {
+        private final EnumSet<User.UserFlag> list;
+        private final int raw;
+    }
+
+    /**
+     * A user's avatar.
+     */
+    @AllArgsConstructor @Getter
+    public static class Avatar {
+        @NonNull private final String id;
+        @NonNull private final String url;
+    }
+
+    /**
+     * A user's banner.
+     */
+    @AllArgsConstructor @Getter
+    public static class Banner {
+        @NonNull private final String id;
+        @NonNull private final String url;
+    }
+
+    /**
+     * A user's Spotify activity data.
+     */
+    @AllArgsConstructor @Getter
+    public static class SpotifyActivity {
+        @NonNull private final String song;
+        @NonNull private final String artist;
+        @NonNull private final String trackProgress;
+        @NonNull private final String trackLength;
+        private final long started;
+        private final long ends;
+
+        /**
+         * Build a Spotify activity from the raw Discord data.
+         *
+         * @param richPresence the raw Discord data
+         * @return the built Spotify activity
+         */
+        @NonNull
+        public static SpotifyActivity fromActivity(@NonNull RichPresence richPresence) {
+            SimpleDateFormat dateFormat = new SimpleDateFormat("m:ss");
+            long started = Objects.requireNonNull(richPresence.getTimestamps()).getStart();
+            long ends = richPresence.getTimestamps().getEnd();
+
+            long trackLength = ends - started;
+            long trackProgress = Math.min(System.currentTimeMillis() - started, trackLength);
+
+            return new SpotifyActivity(
+                    Objects.requireNonNull(richPresence.getDetails()), Objects.requireNonNull(richPresence.getState()).replace(";", ","),
+                    dateFormat.format(trackProgress), dateFormat.format(trackLength),
+                    started, ends
+            );
+        }
+    }
+}

src/main/java/me/braydon/tether/model/ErrorResponse.java

@@ -0,0 +1,43 @@
+package me.braydon.tether.model;
+
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.ToString;
+import org.springframework.http.HttpStatus;
+
+import java.util.Date;
+
+/**
+ * A basic response model.
+ *
+ * @author Braydon
+ */
+@Getter @ToString
+public class ErrorResponse {
+    /**
+     * The status code of this error.
+     */
+    @NonNull private final HttpStatus status;
+
+    /**
+     * The HTTP code of this error.
+     */
+    private final int code;
+
+    /**
+     * The message of this error.
+     */
+    @NonNull private final String message;
+
+    /**
+     * The timestamp this error occurred.
+     */
+    @NonNull private final Date timestamp;
+
+    public ErrorResponse(@NonNull HttpStatus status, @NonNull String message) {
+        this.status = status;
+        this.message = message;
+        this.code = status.value();
+        timestamp = new Date();
+    }
+}

src/main/java/me/braydon/tether/model/response/DiscordUserResponse.java

@@ -0,0 +1,25 @@
+package me.braydon.tether.model.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NonNull;
+import me.braydon.tether.model.DiscordUser;
+
+/**
+ * A response for a successful Discord user request.
+ *
+ * @author Braydon
+ */
+@AllArgsConstructor @Getter
+public final class DiscordUserResponse {
+    /**
+     * The user that was retrieved.
+     */
+    @NonNull private final DiscordUser user;
+
+    /**
+     * The unix timestamp of when this
+     * user was cached, -1 if fresh.
+     */
+    private final long cached;
+}

src/main/java/me/braydon/tether/service/DiscordService.java

@@ -0,0 +1,104 @@
+package me.braydon.tether.service;
+
+import jakarta.annotation.PostConstruct;
+import lombok.NonNull;
+import lombok.SneakyThrows;
+import lombok.extern.log4j.Log4j2;
+import me.braydon.tether.exception.impl.BadRequestException;
+import me.braydon.tether.exception.impl.ResourceNotFoundException;
+import me.braydon.tether.exception.impl.ServiceUnavailableException;
+import me.braydon.tether.model.DiscordUser;
+import me.braydon.tether.model.response.DiscordUserResponse;
+import net.dv8tion.jda.api.JDA;
+import net.dv8tion.jda.api.JDABuilder;
+import net.dv8tion.jda.api.entities.Activity;
+import net.dv8tion.jda.api.entities.Guild;
+import net.dv8tion.jda.api.entities.Member;
+import net.dv8tion.jda.api.entities.User;
+import net.dv8tion.jda.api.exceptions.ErrorResponseException;
+import net.dv8tion.jda.api.requests.GatewayIntent;
+import net.dv8tion.jda.api.utils.cache.CacheFlag;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+/**
+ * This service is responsible for
+ * interacting with the Discord API.
+ *
+ * @author Braydon
+ */
+@Service
+@Log4j2(topic = "Discord")
+public final class DiscordService {
+    @Value("${discord.bot-token}")
+    private String botToken;
+
+    /**
+     * The current instance of the Discord bot.
+     */
+    private JDA jda;
+
+    @PostConstruct
+    public void onInitialize() {
+        connectBot();
+    }
+
+    /**
+     * Get a Discord user by their snowflake.
+     *
+     * @param rawSnowflake the user snowflake
+     * @return the user response
+     * @throws ServiceUnavailableException if the bot is not connected
+     * @throws ResourceNotFoundException if the user is not found
+     */
+    @NonNull
+    public DiscordUserResponse getUserBySnowflake(@NonNull String rawSnowflake) throws BadRequestException, ServiceUnavailableException, ResourceNotFoundException {
+        if (jda == null || (jda.getStatus() != JDA.Status.CONNECTED)) { // Ensure bot is connected
+            throw new ServiceUnavailableException("Not connected to Discord.");
+        }
+        long snowflake;
+        try {
+            snowflake = Long.parseLong(rawSnowflake);
+        } catch (NumberFormatException ex) {
+            throw new BadRequestException("Not a valid snowflake");
+        }
+        try {
+            // First try to locate the user in a guild
+            Member member = null;
+            for (Guild guild : jda.getGuilds()) {
+                if ((member = guild.getMemberById(snowflake)) != null) {
+                    break;
+                }
+            }
+            User user = jda.retrieveUserById(snowflake).complete();
+            User.Profile profile = user.retrieveProfile().complete();
+            return new DiscordUserResponse(DiscordUser.buildFromEntity(user, profile, member), -1L);
+        } catch (ErrorResponseException ex) {
+            // Failed to lookup the user, handle appropriately
+            if (ex.getErrorCode() == 10013) {
+                throw new ResourceNotFoundException("User not found.");
+            }
+            throw ex;
+        }
+    }
+
+    /**
+     * Connects the bot to the Discord API.
+     */
+    @SneakyThrows
+    private void connectBot() {
+        log.info("Connecting bot...");
+        jda = JDABuilder.createDefault(botToken, GatewayIntent.GUILD_PRESENCES, GatewayIntent.GUILD_MEMBERS)
+                .enableCache(CacheFlag.getPrivileged())
+                .setActivity(Activity.watching("you"))
+                .build();
+        jda.getRestPing().queue(ping -> {
+            log.info("The latency to Discord is {}ms", ping);
+        });
+        jda.awaitReady();
+        log.info("Bot connected! Logged in as {}, invite me using {}",
+                jda.getSelfUser().getAsTag(),
+                "https://discord.com/oauth2/authorize?client_id=" + jda.getSelfUser().getId()
+        );
+    }
+}

src/main/resources/application.yml

@@ -0,0 +1,19 @@
+# Server Configuration
+server:
+  address: 0.0.0.0
+  port: 7500
+
+# Log Configuration
+logging:
+  file:
+    path: "./logs"
+
+# Discord Configuration
+discord:
+  bot-token: "CHANGE_ME"
+
+# Spring Configuration
+spring:
+  # Ignore
+  banner:
+    location: "classpath:banner.txt"

src/main/resources/banner.txt

@@ -0,0 +1,10 @@
+  _______   _   _
+ |__   __| | | | |
+    | | ___| |_| |__   ___ _ __
+    | |/ _ \ __| '_ \ / _ \ '__|
+    | |  __/ |_| | | |  __/ |
+    |_|\___|\__|_| |_|\___|_|
+
+ | API Version - v${application.version}
+ | Spring Version - ${spring-boot.formatted-version}
+_______________________________________