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Add geojson endpoints (close #78)

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This commit is contained in:
Petr Sloup
2016-12-06 21:26:30 +01:00
parent 1aaabd2dff
commit ef3f34f778
3 changed files with 38 additions and 9 deletions
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39
src/serve_data.js
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@@ -1,11 +1,14 @@
'use strict';
var fs = require('fs'),
path = require('path');
path = require('path'),
zlib = require('zlib');
var clone = require('clone'),
express = require('express'),
mbtiles = require('mbtiles');
mbtiles = require('mbtiles'),
pbf = require('pbf'),
VectorTile = require('vector-tile').VectorTile;
var tileshrinkGl;
try {
@@ -53,7 +56,8 @@ module.exports = function(options, repo, params, id, styles) {
var z = req.params.z | 0,
x = req.params.x | 0,
y = req.params.y | 0;
if (req.params.format != tileJSON.format) {
if (req.params.format != tileJSON.format &&
!(req.params.format == 'geojson' && tileJSON.format == 'pbf')) {
return res.status(404).send('Invalid format');
}
if (z < tileJSON.minzoom || 0 || x < 0 || y < 0 ||
@@ -73,9 +77,6 @@ module.exports = function(options, repo, params, id, styles) {
return res.status(404).send('Not found');
} else {
if (tileJSON['format'] == 'pbf') {
headers['Content-Type'] = 'application/x-protobuf';
headers['Content-Encoding'] = 'gzip';
var style = req.query.style;
if (style && tileshrinkGl) {
if (!shrinkers[style]) {
@@ -94,15 +95,37 @@ module.exports = function(options, repo, params, id, styles) {
}
}
if (shrinkers[style]) {
data = shrinkers[style](data, z, tileJSON.maxzoom);
data = shrinkers[style](zlib.unzipSync(data), z, tileJSON.maxzoom);
//console.log(shrinkers[style].getStats());
}
}
}
if (req.params.format == 'pbf') {
headers['Content-Type'] = 'application/x-protobuf';
} else if (req.params.format == 'geojson') {
headers['Content-Type'] = 'application/json';
var tile = new VectorTile(new pbf(zlib.unzipSync(data)));
var geojson = {
"type": "FeatureCollection",
"features": []
};
for (var layerName in tile.layers) {
var layer = tile.layers[layerName];
for (var i = 0; i < layer.length; i++) {
var feature = layer.feature(i);
var featureGeoJSON = feature.toGeoJSON(x, y, z);
featureGeoJSON.properties.layer = layerName;
geojson.features.push(featureGeoJSON);
}
}
data = JSON.stringify(geojson);
}
delete headers['ETag']; // do not trust the tile ETag -- regenerate
headers['Content-Encoding'] = 'gzip';
res.set(headers);
return res.status(200).send(data);
return res.status(200).send(zlib.gzipSync(data));
}
}
});