feat: generate tilejson from pmtiles

Signed-off-by: Andrew Calcutt <acalcutt@techidiots.net>

src/serve_data.js

@@ -10,7 +10,7 @@ import MBTiles from '@mapbox/mbtiles';
 import Pbf from 'pbf';
 import { VectorTile } from '@mapbox/vector-tile';
 
-import { getTileUrls, fixTileJSONCenter } from './utils.js';
+import { getTileUrls, fixTileJSONCenter, GetPMtilesInfo } from './utils.js';
 
 export const serve_data = {
   init: (options, repo) => {
@@ -137,7 +137,7 @@ export const serve_data = {
 
     return app;
   },
-  add: (options, repo, params, id, publicUrl) => {
+  add: async (options, repo, params, id, publicUrl) => {
     const mbtilesFile = path.resolve(options.paths.mbtiles, params.mbtiles);
     let tileJSON = {
       tiles: params.domains || options.domains,
@@ -147,7 +147,32 @@ export const serve_data = {
     if (!mbtilesFileStats.isFile() || mbtilesFileStats.size === 0) {
       throw Error(`Not valid MBTiles file: ${mbtilesFile}`);
     }
+
+    const extension = mbtilesFile.split('.').pop().toLowerCase();
     let source;
+    if (extension === 'pmtiles') {
+      const info = await GetPMtilesInfo(mbtilesFile);
+      const metadata = info.metadata
+      source = info.source
+
+      tileJSON['name'] = id;
+      tileJSON['format'] = 'pbf';
+      tileJSON['bounds'] = info.bounds;
+      tileJSON['center'] = info.center;
+      Object.assign(tileJSON, metadata);
+
+      tileJSON['tilejson'] = '2.0.0';
+      delete tileJSON['filesize'];
+      delete tileJSON['mtime'];
+      delete tileJSON['scheme'];
+
+      Object.assign(tileJSON, params.tilejson || {});
+      fixTileJSONCenter(tileJSON);
+
+      if (options.dataDecoratorFunc) {
+        tileJSON = options.dataDecoratorFunc(id, 'tilejson', tileJSON);
+      }
+    } else {
       const sourceInfoPromise = new Promise((resolve, reject) => {
         source = new MBTiles(mbtilesFile + '?mode=ro', (err) => {
           if (err) {
@@ -180,12 +205,15 @@ export const serve_data = {
         });
       });
 
-    return sourceInfoPromise.then(() => {
+      await sourceInfoPromise;
+    }
+
+    console.log(tileJSON);
+
     repo[id] = {
       tileJSON,
       publicUrl,
       source,
     };
-    });
   },
 };

src/utils.js

@@ -191,5 +191,6 @@ export const GetPMtilesInfo = async (pmtilesFile) => {
   const header = await pmtiles.getHeader();
   const metadata = await pmtiles.getMetadata();
   const bounds = [header.minLat, header.minLon, header.maxLat, header.maxLon]
-  return { header: header, metadata: metadata, bounds: bounds };
+  const center = [header.centerLon, header.centerLat, header.centerZoom]
+  return { source: pmtiles, header: header, metadata: metadata, bounds: bounds, center: center };
 }