From 07dfaaf71bf4c1d4b0847ee11d0541e477e9628c Mon Sep 17 00:00:00 2001
From: hyoseung930 <35983843+hyoseung930@users.noreply.github.com>
Date: Fri, 8 May 2026 10:27:33 +0900
Subject: [PATCH] New task
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서버 정상 동작 확인! 이제 Reddit 앱 발급이 필요해요.

---

## Reddit 앱 발급 (2분)

**1단계**: https://www.reddit.com/prefs/apps 접속 → **"are you a developer? create an app..."** 클릭

**2단계** 양식 입력:
- **name**: `WosCouponBot`
- **type**: `script` 선택
- **redirect uri**: `http://localhost` (아무거나 OK)

**3단계** 생성 후 표시되는 값 복사:
```
client_id:     앱 이름 아래 짧은 문자열 (14자리)
client_secret: "secret" 옆 긴 문자열
```

**4단계** EC2 서버 `.env`에 추가:
```bash
ssh -i ~/Desktop/hyoseung.pem ubuntu@3.34.1.212
echo "REDDIT_CLIENT_ID=여기" >> ~/autoCoupon/back/.env
echo "REDDIT_CLIENT_SECRET=여기" >> ~/autoCoupon/back/.env
```

**5단계** 서버 재시작 후 테스트:
```bash
kill $(ps aux | grep 'autoCoupon' | grep node | awk '{print $2}')
cd ~/autoCoupon/back && nohup node dist/main.js >> ~/autoCoupon/back.log 2>&1 &
curl -X POST http://localhost:3002/api/crawler/trigger
```

Reddit 앱 만들면 바로 테스트해볼 수 있어요!
---
 back/.env.example                   |  2 ++
 back/src/crawler/crawler.service.ts | 45 ++++++++++++++++++++++++++---
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/back/.env.example b/back/.env.example
index 9eeda6c..1d90ced 100644
--- a/back/.env.example
+++ b/back/.env.example
@@ -5,3 +5,5 @@ DB_PASSWORD=486251daKWON@
 DB_DATABASE=kakao
 APP_PORT=3000
 DISCORD_WEBHOOK_URL=
+REDDIT_CLIENT_ID=
+REDDIT_CLIENT_SECRET=
diff --git a/back/src/crawler/crawler.service.ts b/back/src/crawler/crawler.service.ts
index 00b6611..c5c9148 100644
--- a/back/src/crawler/crawler.service.ts
+++ b/back/src/crawler/crawler.service.ts
@@ -6,8 +6,8 @@ import axios from 'axios';
 import { WosCoupon } from '../entities/wos-coupon.entity';
 import { WosService } from '../wos/wos.service';
 
-const REDDIT_SEARCH_URL =
-  'https://www.reddit.com/r/WhiteoutSurvival/search.json?q=gift+code+OR+redeem+code+OR+coupon&sort=new&restrict_sr=1&limit=25&t=week';
+const REDDIT_OAUTH_URL = 'https://oauth.reddit.com/r/WhiteoutSurvival/search.json?q=gift+code+OR+redeem+code+OR+coupon&sort=new&restrict_sr=1&limit=25&t=week';
+const REDDIT_TOKEN_URL = 'https://www.reddit.com/api/v1/access_token';
 
 const COMMON_WORDS = new Set([
   'THE', 'AND', 'FOR', 'ARE', 'BUT', 'NOT', 'YOU', 'ALL', 'ANY', 'CAN',
@@ -33,6 +33,8 @@ const COMMON_WORDS = new Set([
 export class CrawlerService {
   private readonly logger = new Logger(CrawlerService.name);
   private seenPostIds = new Set<string>();
+  private redditAccessToken: string | null = null;
+  private redditTokenExpiry = 0;
 
   constructor(
     @InjectRepository(WosCoupon)
@@ -40,6 +42,34 @@ export class CrawlerService {
     private readonly wosService: WosService,
   ) {}
 
+  private async getRedditToken(): Promise<string | null> {
+    const clientId = process.env.REDDIT_CLIENT_ID;
+    const clientSecret = process.env.REDDIT_CLIENT_SECRET;
+    if (!clientId || !clientSecret) return null;
+
+    if (this.redditAccessToken && Date.now() < this.redditTokenExpiry) {
+      return this.redditAccessToken;
+    }
+
+    try {
+      const resp = await axios.post(
+        REDDIT_TOKEN_URL,
+        new URLSearchParams({ grant_type: 'client_credentials' }),
+        {
+          auth: { username: clientId, password: clientSecret },
+          headers: { 'User-Agent': 'WosCouponBot/1.0 by wageulwageul' },
+          timeout: 10000,
+        },
+      );
+      this.redditAccessToken = resp.data.access_token;
+      this.redditTokenExpiry = Date.now() + (resp.data.expires_in - 60) * 1000;
+      return this.redditAccessToken;
+    } catch (err: any) {
+      this.logger.error(`Reddit 토큰 발급 실패: ${err.message}`);
+      return null;
+    }
+  }
+
   private extractCodes(text: string): string[] {
     const codePattern = /\b([A-Z][A-Z0-9]{4,19})\b/g;
     const found = new Set<string>();
@@ -97,9 +127,16 @@ export class CrawlerService {
 
     let posts: any[] = [];
     try {
-      const resp = await axios.get(REDDIT_SEARCH_URL, {
+      const token = await this.getRedditToken();
+      if (!token) {
+        this.logger.warn('Reddit OAuth 토큰 없음 - REDDIT_CLIENT_ID/SECRET 환경변수를 설정하세요');
+        return { found: 0, added: [] };
+      }
+
+      const resp = await axios.get(REDDIT_OAUTH_URL, {
         headers: {
-          'User-Agent': 'WosCouponBot/1.0',
+          'Authorization': `Bearer ${token}`,
+          'User-Agent': 'WosCouponBot/1.0 by wageulwageul',
           'Accept': 'application/json',
         },
         timeout: 10000,