[AB-xxx] initial experience leaderboard version

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/api/ExceptionHandlerConfig.java

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+package dev.sheldan.abstracto.core.api;
+
+import dev.sheldan.abstracto.core.exception.GuildNotFoundException;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+@Slf4j
+public class ExceptionHandlerConfig {
+
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    @ExceptionHandler(GuildNotFoundException.class)
+    protected ResponseEntity<String> handleResourceNotFound(GuildNotFoundException ex){
+        log.warn("Server not found.", ex);
+        return ResponseEntity
+                .status(HttpStatus.NOT_FOUND)
+                .body("Server not found");
+    }
+}

abstracto-application/core/core-impl/src/main/java/dev/sheldan/abstracto/core/api/ServerController.java

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+package dev.sheldan.abstracto.core.api;
+
+import dev.sheldan.abstracto.core.models.api.GuildDisplay;
+import dev.sheldan.abstracto.core.service.GuildService;
+import dev.sheldan.abstracto.core.service.management.ServerManagementService;
+import net.dv8tion.jda.api.entities.Guild;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping(value = "/servers/v1/")
+public class ServerController {
+
+    @Autowired
+    private ServerManagementService serverManagementService;
+
+    @Autowired
+    private GuildService guildService;
+
+    @GetMapping(value = "/{serverId}/info", produces = "application/json")
+    public GuildDisplay getLeaderboard(@PathVariable("serverId") Long serverId) {
+        serverManagementService.loadServer(serverId); // only used for verification if it exists in the db
+        Guild guild = guildService.getGuildById(serverId);
+        return GuildDisplay
+                .builder()
+                .name(guild.getName())
+                .id(guild.getIdLong())
+                .bannerUrl(guild.getBannerUrl())
+                .iconUrl(guild.getIconUrl())
+                .build();
+    }
+}