101 lines
2.7 KiB
JavaScript
101 lines
2.7 KiB
JavaScript
'use strict';
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var async = require('async'),
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asyncLock = require('async-lock'),
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crypto = require('crypto'),
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fs = require('fs'),
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path = require('path'),
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util = require('util'),
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zlib = require('zlib');
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var abaculus = require('abaculus'),
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clone = require('clone'),
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concat = require('concat-stream'),
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express = require('express'),
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mercator = new (require('sphericalmercator'))(),
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mbgl = require('mapbox-gl-native'),
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mbtiles = require('mbtiles'),
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request = require('request');
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var utils = require('./utils');
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module.exports = function(maps, options, prefix) {
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var lock = new asyncLock();
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var app = express().disable('x-powered-by'),
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domains = options.domains,
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tilePath = '/{z}/{x}/{y}.pbf';
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var rootPath = path.join(process.cwd(), options.root);
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var mbtilesPath = options.mbtiles;
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var map = {
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tileJSON: {}
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};
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maps[prefix] = map;
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var source = new mbtiles(path.join(rootPath, mbtilesPath), function(err) {
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source.getInfo(function(err, info) {
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map.tileJSON['name'] = prefix.substr(1);
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Object.assign(map.tileJSON, info);
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map.tileJSON['tilejson'] = '2.0.0';
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map.tileJSON['basename'] = prefix.substr(1);
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map.tileJSON['format'] = 'pbf';
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Object.assign(map.tileJSON, options.options || {});
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});
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});
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var tilePattern = tilePath
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.replace('{z}', ':z(\\d+)')
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.replace('{x}', ':x(\\d+)')
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.replace('{y}', ':y(\\d+)');
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var getTile = function(z, x, y, callback) {
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source.getTile(z, x, y, function(err, data, headers) {
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if (err) {
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callback(err);
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} else {
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var md5 = crypto.createHash('md5').update(data).digest('base64');
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headers['content-md5'] = md5;
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headers['content-type'] = 'application/x-protobuf';
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headers['content-encoding'] = 'gzip';
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callback(null, data, headers);
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}
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});
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};
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app.get(tilePattern, function(req, res, next) {
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var z = req.params.z | 0,
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x = req.params.x | 0,
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y = req.params.y | 0;
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return getTile(z, x, y, function(err, data, headers) {
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if (err) {
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return next(err);
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}
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if (headers) {
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res.set(headers);
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}
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if (data == null) {
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return res.status(404).send('Not found');
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} else {
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return res.status(200).send(data);
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}
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}, res, next);
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});
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app.get('/index.json', function(req, res, next) {
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var info = clone(map.tileJSON);
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info.tiles = utils.getTileUrls(req.protocol, domains, req.headers.host,
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prefix, tilePath, info.format,
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req.query.key);
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return res.send(info);
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});
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return app;
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};
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