feat(packs-lab): POST /api/packs/admin/mint-token 라우트 + 통합 테스트

MintTokenRequest/Response 스키마 추가, mint_token 라우트 구현 (HMAC 인증 + 확장자 검증 + JTI 발급), 테스트 3건 추가.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packs-lab/app/routes.py

@@ -8,6 +8,7 @@
 import logging
 import os
 import re
+import time
 import uuid
 from datetime import datetime, timezone
 from pathlib import Path
@@ -15,9 +16,11 @@ from pathlib import Path
 from fastapi import APIRouter, File, Header, HTTPException, Request, UploadFile
 from supabase import Client, create_client
 
-from .auth import verify_request_hmac, verify_upload_token
+from .auth import mint_upload_token, verify_request_hmac, verify_upload_token
 from .dsm_client import DSMError, create_share_link
 from .models import (
+    MintTokenRequest,
+    MintTokenResponse,
     PackFileItem,
     SignLinkRequest,
     SignLinkResponse,
@@ -31,6 +34,7 @@ PACK_BASE_DIR = Path("/volume1/docker/webpage/media/packs")
 ALLOWED_EXT = {"pdf", "zip", "mp4", "mov", "mkv", "wav", "m4a", "mp3", "png", "jpg", "jpeg", "webp", "prj"}
 MAX_BYTES = 5 * 1024 * 1024 * 1024  # 5GB
 SAFE_FILENAME = re.compile(r"^[\w가-힣\-\.\(\)\s]+$")
+UPLOAD_TOKEN_TTL_SEC = int(os.getenv("UPLOAD_TOKEN_TTL_SEC", "1800"))  # 30분 default
 
 
 def _supabase() -> Client:
@@ -76,6 +80,34 @@ async def sign_link(
     return SignLinkResponse(url=url, expires_at=expires_at)
 
 
+@router.post("/admin/mint-token", response_model=MintTokenResponse)
+async def mint_token(
+    request: Request,
+    x_timestamp: str = Header(""),
+    x_signature: str = Header(""),
+):
+    body = await request.body()
+    verify_request_hmac(body, x_timestamp, x_signature)
+    payload = MintTokenRequest.model_validate_json(body)
+    _check_filename(payload.filename)
+
+    jti = str(uuid.uuid4())
+    expires_ts = int(time.time()) + UPLOAD_TOKEN_TTL_SEC
+    token = mint_upload_token({
+        "tier": payload.tier,
+        "label": payload.label,
+        "filename": payload.filename,
+        "size_bytes": payload.size_bytes,
+        "jti": jti,
+        "expires_at": expires_ts,
+    })
+    return MintTokenResponse(
+        token=token,
+        expires_at=datetime.fromtimestamp(expires_ts, tz=timezone.utc),
+        jti=jti,
+    )
+
+
 @router.post("/upload", response_model=UploadResponse)
 async def upload(
     file: UploadFile = File(...),