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* Api methods used in control and layer
* For advanced usage
*
* @module TileManager
*
*/
import { Bounds, Browser, CRS, Point, Util } from 'leaflet';
import { openDB, deleteDB, IDBPDatabase } from 'idb';
import { FeatureCollection, Polygon } from 'geojson';
export type TileInfo = {
key: string;
url: string;
urlTemplate: string;
x: number;
y: number;
z: number;
createdAt: number;
};
export type StoredTile = TileInfo & { blob: Blob };
const tileStoreName = 'tileStore';
const urlTemplateIndex = 'urlTemplate';
let dbPromise: Promise<IDBPDatabase> | undefined;
export function openTilesDataBase(): Promise<IDBPDatabase> {
if (dbPromise) {
return dbPromise;
}
dbPromise = openDB('leaflet.offline', 2, {
upgrade(db, oldVersion) {
deleteDB('leaflet_offline');
deleteDB('leaflet_offline_areas');
if (oldVersion < 1) {
const tileStore = db.createObjectStore(tileStoreName, {
keyPath: 'key',
});
tileStore.createIndex(urlTemplateIndex, 'urlTemplate');
tileStore.createIndex('z', 'z');
}
},
});
return dbPromise;
}
/**
* @example
* ```js
* import { getStorageLength } from 'leaflet.offline'
* getStorageLength().then(i => console.log(i + 'tiles in storage'))
* ```
*/
export async function getStorageLength(): Promise<number> {
const db = await openTilesDataBase();
return db.count(tileStoreName);
}
/**
* @example
* ```js
* import { getStorageInfo } from 'leaflet.offline'
* getStorageInfo('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png')
* ```
*/
export async function getStorageInfo(
urlTemplate: string,
): Promise<StoredTile[]> {
const range = IDBKeyRange.only(urlTemplate);
const db = await openTilesDataBase();
return db.getAllFromIndex(tileStoreName, urlTemplateIndex, range);
}
/**
* @example
* ```js
* import { downloadTile } from 'leaflet.offline'
* downloadTile(tileInfo.url).then(blob => saveTile(tileInfo, blob))
* ```
*/
export async function downloadTile(tileUrl: string): Promise<Blob> {
const response = await fetch(tileUrl);
if (!response.ok) {
throw new Error(`Request failed with status ${response.statusText}`);
}
return response.blob();
}
/**
* @example
* ```js
* saveTile(tileInfo, blob).then(() => console.log(`saved tile from ${tileInfo.url}`))
* ```
*/
export async function saveTile(
tileInfo: TileInfo,
blob: Blob,
): Promise<IDBValidKey> {
const db = await openTilesDataBase();
return db.put(tileStoreName, {
blob,
...tileInfo,
});
}
export function getTileUrl(urlTemplate: string, data: any): string {
return Util.template(urlTemplate, {
...data,
r: Browser.retina ? '@2x' : '',
});
}
export function getTilePoints(area: Bounds, tileSize: Point): Point[] {
const points: Point[] = [];
Iif (!area.min || !area.max) {
return points;
}
const topLeftTile = area.min.divideBy(tileSize.x).floor();
const bottomRightTile = area.max.divideBy(tileSize.x).floor();
for (let j = topLeftTile.y; j <= bottomRightTile.y; j += 1) {
for (let i = topLeftTile.x; i <= bottomRightTile.x; i += 1) {
points.push(new Point(i, j));
}
}
return points;
}
/**
* Get a geojson of tiles from one resource
*
* @example
* const urlTemplate = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
* const getGeoJsonData = () => LeafletOffline.getStorageInfo(urlTemplate)
* .then((data) => LeafletOffline.getStoredTilesAsJson(baseLayer, data));
*
* getGeoJsonData().then((geojson) => {
* storageLayer = L.geoJSON(geojson).bindPopup(
* (clickedLayer) => clickedLayer.feature.properties.key,
* );
* });
*
*/
export function getStoredTilesAsJson(
tileSize: { x: number; y: number },
tiles: TileInfo[],
): FeatureCollection<Polygon> {
const featureCollection: FeatureCollection<Polygon> = {
type: 'FeatureCollection',
features: [],
};
for (let i = 0; i < tiles.length; i += 1) {
const topLeftPoint = new Point(
tiles[i].x * tileSize.x,
tiles[i].y * tileSize.y,
);
const bottomRightPoint = new Point(
topLeftPoint.x + tileSize.x,
topLeftPoint.y + tileSize.y,
);
const topLeftlatlng = CRS.EPSG3857.pointToLatLng(topLeftPoint, tiles[i].z);
const botRightlatlng = CRS.EPSG3857.pointToLatLng(
bottomRightPoint,
tiles[i].z,
);
featureCollection.features.push({
type: 'Feature',
properties: tiles[i],
geometry: {
type: 'Polygon',
coordinates: [
[
[topLeftlatlng.lng, topLeftlatlng.lat],
[botRightlatlng.lng, topLeftlatlng.lat],
[botRightlatlng.lng, botRightlatlng.lat],
[topLeftlatlng.lng, botRightlatlng.lat],
[topLeftlatlng.lng, topLeftlatlng.lat],
],
],
},
});
}
return featureCollection;
}
/**
* Remove tile by key
*/
export async function removeTile(key: string): Promise<void> {
const db = await openTilesDataBase();
return db.delete(tileStoreName, key);
}
/**
* Get single tile blob
*/
export async function getBlobByKey(key: string): Promise<Blob> {
return (await openTilesDataBase())
.get(tileStoreName, key)
.then((result) => result && result.blob);
}
export async function hasTile(key: string): Promise<boolean> {
const db = await openTilesDataBase();
const result = await db.getKey(tileStoreName, key);
return result !== undefined;
}
/**
* Remove everything
*/
export async function truncate(): Promise<void> {
return (await openTilesDataBase()).clear(tileStoreName);
}
export async function getTileImageSource(key: string, url: string) {
const shouldUseUrl = !(await hasTile(key));
if (shouldUseUrl) {
return url;
}
const blob = await getBlobByKey(key);
return URL.createObjectURL(blob);
}
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