Add PMTiles support (#938)

Add support for pmtiles sources. Solves #807 

<strike>
There is still an error, probably when adding the source to the Maputnik
sources:

```
Failed to process sources for 'pmtiles://https://example.com/data/switzerland.pmtiles' TypeError: NetworkError when attempting to fetch resource.
    fetchSources App.tsx:642
```

@bdon How did you solve this for https://editor.protomaps.com/ ?
</strike>

---------

Co-authored-by: Brandon Liu <bdon@bdon.org>
Co-authored-by: WebFreak001 <gh@webfreak.org>
Co-authored-by: ShellyDCMS <60476837+ShellyDCMS@users.noreply.github.com>
Co-authored-by: Harel M <harel.mazor@gmail.com>

src/components/App.tsx

@@ -8,6 +8,7 @@ import get from 'lodash.get'
 import {unset} from 'lodash'
 import {arrayMoveMutable} from 'array-move'
 import hash from "string-hash";
+import { PMTiles } from "pmtiles";
 import {Map, LayerSpecification, StyleSpecification, ValidationError, SourceSpecification} from 'maplibre-gl'
 import {latest, validateStyleMin} from '@maplibre/maplibre-gl-style-spec'
 
@@ -641,33 +642,41 @@ export default class App extends React.Component<any, AppState> {
           console.warn("Failed to setFetchAccessToken: ", err);
         }
 
-        fetch(url!, {
-          mode: 'cors',
-        })
-          .then(response => response.json())
-          .then(json => {
+        const setVectorLayers = (json:any) => {
+          if(!Object.prototype.hasOwnProperty.call(json, "vector_layers")) {
+            return;
+          }
 
-            if(!Object.prototype.hasOwnProperty.call(json, "vector_layers")) {
-              return;
-            }
-
-            // Create new objects before setState
-            const sources = Object.assign({}, {
-              [key]: this.state.sources[key],
-            });
-
-            for(const layer of json.vector_layers) {
-              (sources[key] as any).layers.push(layer.id)
-            }
-
-            console.debug("Updating source: "+key);
-            this.setState({
-              sources: sources
-            });
-          })
-          .catch(err => {
-            console.error("Failed to process sources for '%s'", url, err);
+          // Create new objects before setState
+          const sources = Object.assign({}, {
+            [key]: this.state.sources[key],
           });
+
+          for(const layer of json.vector_layers) {
+            (sources[key] as any).layers.push(layer.id)
+          }
+
+          this.setState({
+            sources: sources
+          });
+        };
+
+        if (url!.startsWith("pmtiles://")) {
+          (new PMTiles(url!.substr(10))).getTileJson("")
+            .then(json => setVectorLayers(json))
+            .catch(err => {
+              console.error("Failed to process sources for '%s'", url, err);
+            });
+        } else {
+          fetch(url!, {
+            mode: 'cors',
+          })
+            .then(response => response.json())
+            .then(json => setVectorLayers(json))
+            .catch(err => {
+              console.error("Failed to process sources for '%s'", url, err);
+            });
+        }
       }
       else {
         sourceList[key] = this.state.sources[key] || this.state.mapStyle.sources[key];

src/components/MapMaplibreGl.tsx

@@ -15,6 +15,7 @@ import MaplibreGeocoder, { MaplibreGeocoderApi, MaplibreGeocoderApiConfig } from
 import '@maplibre/maplibre-gl-geocoder/dist/maplibre-gl-geocoder.css';
 import { withTranslation, WithTranslation } from 'react-i18next'
 import i18next from 'i18next'
+import { Protocol } from "pmtiles";
 
 function renderPopup(popup: JSX.Element, mountNode: ReactDOM.Container): HTMLElement {
   ReactDOM.render(popup, mountNode);
@@ -148,6 +149,8 @@ class MapMaplibreGlInternal extends React.Component<MapMaplibreGlInternalProps,
       localIdeographFontFamily: false
     } satisfies MapOptions;
 
+    const protocol = new Protocol({metadata: true});
+    MapLibreGl.addProtocol("pmtiles",protocol.tile);
     const map = new MapLibreGl.Map(mapOpts);
 
     const mapViewChange = () => {

src/components/ModalSources.tsx

@@ -51,6 +51,7 @@ function editorMode(source: SourceSpecification) {
   }
   if(source.type === 'vector') {
     if(source.tiles) return 'tile_vector'
+    if(source.url && source.url.startsWith("pmtiles://")) return 'pmtiles_vector'
     return 'tilejson_vector'
   }
   if(source.type === 'geojson') {
@@ -129,6 +130,10 @@ class AddSource extends React.Component<AddSourceProps, AddSourceState> {
     const {protocol} = window.location;
 
     switch(mode) {
+    case 'pmtiles_vector': return {
+      type: 'vector',
+      url: `${protocol}//localhost:3000/file.pmtiles`
+    }
     case 'geojson_url': return {
       type: 'geojson',
       data: `${protocol}//localhost:3000/geojson.json`
@@ -240,6 +245,7 @@ class AddSource extends React.Component<AddSourceProps, AddSourceState> {
           ['tile_raster', t('Raster (Tile URLs)')],
           ['tilejson_raster-dem', t('Raster DEM (TileJSON URL)')],
           ['tilexyz_raster-dem', t('Raster DEM (XYZ URLs)')],
+          ['pmtiles_vector', t('Vector (PMTiles)')],
           ['image', t('Image')],
           ['video', t('Video')],
         ]}

src/components/ModalSourcesTypeEditor.tsx

@@ -11,7 +11,7 @@ import FieldCheckbox from './FieldCheckbox'
 import { WithTranslation, withTranslation } from 'react-i18next';
 import { TFunction } from 'i18next'
 
-export type EditorMode = "video" | "image" | "tilejson_vector" | "tile_raster" | "tilejson_raster" | "tilexyz_raster-dem" | "tilejson_raster-dem" | "tile_vector" | "geojson_url" | "geojson_json" | null;
+export type EditorMode = "video" | "image" | "tilejson_vector" | "tile_raster" | "tilejson_raster" | "tilexyz_raster-dem" | "tilejson_raster-dem" | "pmtiles_vector" | "tile_vector" | "geojson_url" | "geojson_json" | null;
 
 type TileJSONSourceEditorProps = {
   source: {
@@ -286,6 +286,33 @@ class GeoJSONSourceFieldJsonEditor extends React.Component<GeoJSONSourceFieldJso
   }
 }
 
+type PMTilesSourceEditorProps = {
+  source: {
+    url: string
+  }
+  onChange(...args: unknown[]): unknown
+  children?: React.ReactNode
+} & WithTranslation;
+
+class PMTilesSourceEditor extends React.Component<PMTilesSourceEditorProps> {
+  render() {
+    const t = this.props.t;
+    return <div>
+      <FieldUrl
+        label={t("PMTiles URL")}
+        fieldSpec={latest.source_vector.url}
+        value={this.props.source.url}
+        data-wd-key="modal:sources.add.source_url"
+        onChange={(url: string) => this.props.onChange({
+          ...this.props.source,
+          url: url.startsWith("pmtiles://") ? url : `pmtiles://${url}`
+        })}
+      />
+      {this.props.children}
+    </div>
+  }
+}
+
 type ModalSourcesTypeEditorInternalProps = {
   mode: EditorMode
   source: any
@@ -343,6 +370,7 @@ class ModalSourcesTypeEditorInternal extends React.Component<ModalSourcesTypeEdi
         value={this.props.source.encoding || latest.source_raster_dem.encoding.default}
       />
     </TileURLSourceEditor>
+    case 'pmtiles_vector': return <PMTilesSourceEditor {...commonProps} />
     case 'image': return <ImageSourceEditor {...commonProps} />
     case 'video': return <VideoSourceEditor {...commonProps} />
     default: return null