release: bump version to 0.30.0

backend/app/api/v1/visualization.py

@@ -6,7 +6,8 @@ Returns GeoJSON format compatible with Three.js, CesiumJS, and Unreal Cesium.
 
 from datetime import UTC, datetime
 import math
-from fastapi import APIRouter, HTTPException, Depends, Query
+import httpx
+from fastapi import APIRouter, HTTPException, Depends, Query, Response
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, func
 from typing import List, Dict, Any, Optional
@@ -23,6 +24,9 @@ from app.services.cable_graph import build_graph_from_data, CableGraph, haversin
 from app.services.collectors.bgp_common import RIPE_RIS_COLLECTOR_COORDS
 
 router = APIRouter()
+TERRAIN_TILE_URL_TEMPLATE = (
+    "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png"
+)
 
 
 # ============== Converter Functions ==============
@@ -804,6 +808,50 @@ async def get_landing_points_geojson(db: AsyncSession = Depends(get_db)):
         raise HTTPException(status_code=500, detail=f"Internal error: {str(e)}")
 
 
+@router.get("/terrain/terrarium/{z}/{x}/{y}.png")
+async def get_terrarium_tile(z: int, x: int, y: int):
+    """Proxy Terrarium elevation tiles through the backend to avoid browser CORS issues."""
+    if z < 0 or x < 0 or y < 0:
+        raise HTTPException(status_code=400, detail="Invalid terrain tile coordinates")
+
+    url = TERRAIN_TILE_URL_TEMPLATE.format(z=z, x=x, y=y)
+
+    try:
+        async with httpx.AsyncClient(
+            timeout=20.0,
+            follow_redirects=True,
+        ) as client:
+            upstream = await client.get(url)
+            upstream.raise_for_status()
+    except httpx.HTTPStatusError as exc:
+        raise HTTPException(
+            status_code=exc.response.status_code,
+            detail=f"Terrain tile upstream error: {exc.response.status_code}",
+        ) from exc
+    except httpx.HTTPError as exc:
+        raise HTTPException(
+            status_code=502,
+            detail=f"Terrain tile fetch failed: {exc}",
+        ) from exc
+
+    cache_control = upstream.headers.get("cache-control") or "public, max-age=86400"
+    etag = upstream.headers.get("etag")
+    last_modified = upstream.headers.get("last-modified")
+    headers = {
+        "Cache-Control": cache_control,
+    }
+    if etag:
+        headers["ETag"] = etag
+    if last_modified:
+        headers["Last-Modified"] = last_modified
+
+    return Response(
+        content=upstream.content,
+        media_type=upstream.headers.get("content-type", "image/png"),
+        headers=headers,
+    )
+
+
 @router.get("/geo/all")
 async def get_all_geojson(db: AsyncSession = Depends(get_db)):
     records_by_source = await _load_current_collected_data_by_sources(