Add endpoint to get camera snapshot url

StreamServer/src/main.py

@@ -2,7 +2,7 @@ import uvicorn
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from routers import video, weather, prediction
+from routers import video, weather, prediction, camera
 
 
 app = FastAPI(
@@ -32,6 +32,7 @@ app.add_middleware(
 app.include_router(video.router, prefix="/camera")
 app.include_router(weather.router, prefix="/weather")
 app.include_router(prediction.router, prefix="/weather")
+app.include_router(camera.router, prefix="/camera")
 
 @app.get("/")
 def read_root():

StreamServer/src/query/camera.py

@@ -0,0 +1,35 @@
+from datetime import datetime, timedelta
+from minio.error import InvalidResponseError
+from pytz import UTC
+
+from config import VIDEO_BUCKET
+from database import minio_client
+
+
+def list_objects_with_timestamp(bucket_name: str = VIDEO_BUCKET) -> list[tuple[str, datetime]]:
+    """List objects in the specified bucket with their last modified timestamp"""
+    try:
+        objects = minio_client.list_objects(bucket_name, recursive=True)
+        jpeg_objects = [(obj.object_name, obj.last_modified) for obj in objects if obj.object_name.endswith('.jpg') or obj.object_name.endswith('.jpeg')]
+        return jpeg_objects
+    except InvalidResponseError as err:
+        print(err)
+        return []
+
+
+def filter_objects_by_date(objects_with_timestamp: list, interval: str) -> list:
+    """List objects with timestamp within the specified interval. Supported intervals: 'today', 'week', 'month', 'all'"""
+    now_datetime = datetime.now(UTC)
+
+    if interval == "today":
+        start_datetime = now_datetime - timedelta(days=1)
+    elif interval == "week":
+        start_datetime = now_datetime - timedelta(days=7)
+    elif interval == "month":
+        start_datetime = now_datetime - timedelta(days=30)
+    elif interval == "all":
+        start_datetime = datetime.min.replace(tzinfo=UTC)  # Consider all dates
+    else:
+        raise ValueError("Invalid interval. Supported intervals: 'today', 'week', 'month', 'all'")
+
+    return [obj for obj, timestamp in objects_with_timestamp if start_datetime <= timestamp <= now_datetime]

StreamServer/src/routers/camera.py

@@ -0,0 +1,25 @@
+from datetime import timedelta
+
+from fastapi import APIRouter, HTTPException
+
+from query.camera import list_objects_with_timestamp, filter_objects_by_date
+
+from config import VIDEO_BUCKET
+from database import minio_client
+
+
+router = APIRouter()
+
+
+@router.get("/snapshot/{interval}", response_model=list[str])
+async def get_snapshot(interval: str):
+    """Return the list of URLs of camera snapshot within the specified interval. Supported intervals: 'today', 'week', 'month', 'all'"""
+    try:
+        res = filter_objects_by_date(list_objects_with_timestamp(), interval)
+    except ValueError as err:
+        raise HTTPException(status_code=400, detail=str(err))
+
+    if not res:
+        raise HTTPException(status_code=404, detail="No snapshot found")
+
+    return [minio_client.presigned_get_object(VIDEO_BUCKET, obj, expires=timedelta(days=1), response_headers={'response-content-type': 'image/jpeg'}) for obj in res]