新增图源修改功能

meshmap_frontend/src/mapSource.ts

@@ -0,0 +1,19 @@
+import { getDefaultMapSource } from './api'
+import type { PublicMapTileSource } from './types'
+
+export const fallbackMapSource: PublicMapTileSource = {
+  id: 0,
+  name: 'OpenStreetMap Japan',
+  url_template: 'https://tile.openstreetmap.jp/{z}/{x}/{y}.png',
+  attribution: '© OpenStreetMap contributors',
+  max_zoom: 19,
+}
+
+export async function loadDefaultMapSource(): Promise<PublicMapTileSource> {
+  try {
+    const response = await getDefaultMapSource()
+    return response.item
+  } catch {
+    return fallbackMapSource
+  }
+}