Feat/#26 문제 검증 핸들러 패턴 구현

apps/server/src/problems/validation/handler-resolver.ts

@@ -0,0 +1,20 @@
+import { Injectable } from '@nestjs/common';
+import { ValidationHandler } from './handlers/validation.handler';
+import { UnitValidationHandler } from './handlers/unit-validation.handler';
+
+@Injectable()
+export class HandlerResolver {
+  private handlers: Map<string, ValidationHandler>;
+
+  constructor(private readonly unitHandler: UnitValidationHandler) {
+    this.handlers = new Map([['unit', this.unitHandler]]);
+  }
+
+  resolve(problemType: string): ValidationHandler {
+    const handler = this.handlers.get(problemType);
+    if (!handler) {
+      throw new Error(`${problemType} 에 대한 ValidationHandler가 없습니다.`);
+    }
+    return handler;
+  }
+}

apps/server/src/problems/validation/handlers/unit-validation.handler.ts

@@ -0,0 +1,31 @@
+import { ValidationHandler } from './validation.handler';
+import { SubmitResponseDto } from 'src/problems/dto/submit-response.dto';
+import { ConfigDto } from 'src/problems/dto/submit-request.dto';
+
+export class UnitValidationHandler implements ValidationHandler {
+  support(problemType: string): boolean {
+    return problemType === 'unit';
+  }
+
+  validate(submitConfig: ConfigDto, problemData: any): SubmitResponseDto {
+    // test 용 검증 로직: 제출한 풀이가 problemData.answer와 일치하는지 확인
+    const answer = (submitConfig.configInfo?.answer ?? '') as string;
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+    const expectedAnswer = problemData.answer as string;
+
+    if (answer === expectedAnswer) {
+      return { result: 'PASS', feedback: [] };
+    }
+
+    return {
+      result: 'FAIL',
+      feedback: [
+        {
+          field: 'answer',
+          code: 'WRONG_ANSWER',
+          message: '틀렸습니다.',
+        },
+      ],
+    };
+  }
+}

apps/server/src/problems/validation/validation.service.ts

@@ -0,0 +1,13 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigDto } from '../dto/submit-request.dto';
+import { HandlerResolver } from './handler-resolver';
+
+@Injectable()
+export class ValidationService {
+  constructor(private readonly handlerResolver: HandlerResolver) {}
+
+  validate(problemType: string, submitConfig: ConfigDto, problemData: any) {
+    const handler = this.handlerResolver.resolve(problemType);
+    return handler.validate(submitConfig, problemData);
+  }
+}