feat: replace whitelabel page with custom error controller

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.gw2auth</groupId>
     <artifactId>oauth2-server</artifactId>
-    <version>1.73.1</version>
+    <version>1.74.0</version>
     <packaging>jar</packaging>
 
     <parent>

src/main/java/com/gw2auth/oauth2/server/web/CustomErrorController.java

@@ -0,0 +1,49 @@
+package com.gw2auth.oauth2.server.web;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.beans.factory.annotation.Autowired;
+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.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import java.util.Map;
+
+@RestController
+public class CustomErrorController extends AbstractErrorController {
+
+    @Autowired
+    public CustomErrorController(ErrorAttributes errorAttributes) {
+        super(errorAttributes);
+    }
+
+    @GetMapping("/error")
+    public ResponseEntity<?> error(HttpServletRequest request) {
+        final Map<String, Object> attributes = getErrorAttributes(request, getErrorAttributeOptions());
+
+        return ResponseEntity.status(HttpStatus.FOUND)
+                .location(
+                        UriComponentsBuilder
+                                .fromUriString(request.getRequestURI())
+                                .replacePath("/error")
+                                .queryParam("status", attributes.get("status"))
+                                .queryParam("error", attributes.get("error"))
+                                .queryParam("message", attributes.get("message"))
+                                .queryParam("path", attributes.get("path"))
+                                .build()
+                                .toUri()
+                )
+                .build();
+    }
+
+    protected ErrorAttributeOptions getErrorAttributeOptions() {
+        return ErrorAttributeOptions.defaults()
+                .including(ErrorAttributeOptions.Include.EXCEPTION)
+                .including(ErrorAttributeOptions.Include.MESSAGE)
+                .including(ErrorAttributeOptions.Include.PATH);
+    }
+}

src/main/resources/application.yml

@@ -19,6 +19,12 @@ com.gw2auth:
       interval: ${GW2AUTH_TOKEN_VALID_CHECK_INTERVAL}
       ignore-after: ${GW2AUTH_TOKEN_VALID_CHECK_IGNORE_AFTER}
 
+server:
+  error:
+    path: '/error'
+    whitelabel:
+      enabled: false
+
 spring:
   datasource:
     url: "jdbc:postgresql://${SERVER_POSTGRES_HOST}:${SERVER_POSTGRES_PORT}/${SERVER_POSTGRES_DB}${SERVER_POSTGRES_OPTIONS}"