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More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","import http = require('http');\r\nimport path = require('path');\r\nimport fs = require('fs');\r\nimport express = require('express');\r\nimport request = require('request');\r\nimport mkdirp = require('mkdirp');\r\nimport rmdir = require('rimraf');\r\nimport async = require('async');\r\n\r\nvar md5 = require('md5'),\r\n tilelive = require('tilelive');\r\n\r\n//require('tilelive-bridge').registerProtocols(tilelive);\r\n\r\n// Iterate over all sub-folders in sources.\r\n// Each sub-folder's name needs to match the tilelive module name,\r\n// e.g. all mbtiles need to be in the mbtiles sub folder, as that \r\n// is the name of the corresponding node package.\r\n// Register each sub-folder name that is not empty\r\n// In that folder, open all files.\r\n\r\n/** Interface to describe a tile source */\r\nexport interface ITileSource {\r\n /** Protocol to use for loading the tile source */\r\n protocol: string;\r\n /** Absolute or relative path to the file. If not absolute, the current folder is used. */\r\n path: string;\r\n /** Fallback URI, e.g. when no tile can be found, you can redirect it to this URL. */\r\n fallbackUri: string;\r\n}\r\n\r\n/** Options */\r\nexport interface ITileSourceOptions {\r\n /** If true, set headers to enable CORRS. */\r\n corrs?: boolean;\r\n /** source folder. If not set, uses ./sources */\r\n sources?: string;\r\n /** Specify a source manually by setting its path. If set, ignores 'sources' folder. */\r\n tileSources?: ITileSource[];\r\n /** Path to the cache folder, if any. */\r\n cache?: string;\r\n};\r\n\r\nexport class TileSource {\r\n cacheFolder: string;\r\n\r\n constructor(private app: express.Express, options?: ITileSourceOptions) {\r\n var defaultOptions = {\r\n corrs: true,\r\n sources: path.join(__dirname, 'tilesources'),\r\n tileSources: [],\r\n cache: path.join(__dirname, 'cache')\r\n };\r\n if (!options) options = defaultOptions;\r\n\r\n // enable corrs\r\n if ((options && typeof options.corrs !== 'undefined' && options.corrs) || defaultOptions.corrs) {\r\n app.use(function(req, res, next) {\r\n res.header('Access-Control-Allow-Origin', '*');\r\n res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');\r\n next();\r\n });\r\n }\r\n\r\n if (options.cache) {\r\n this.cacheFolder = options.cache;\r\n if (!fs.existsSync(this.cacheFolder)) {\r\n mkdirp(this.cacheFolder, err => {\r\n if (err) console.error('Error creating cache folder: ' + err);\r\n });\r\n }\r\n }\r\n\r\n if (options.tileSources && options.tileSources.length > 0) {\r\n // Source files are explicitly stated\r\n options.tileSources.forEach(source => {\r\n this.load(source.protocol, source.path, source.fallbackUri, this.pathIsAbsolute(source.path) ? '' : __dirname, () => {});\r\n });\r\n } else {\r\n // Folder that contains the source map files.\r\n var tileFolder = options.sources || defaultOptions.sources;\r\n fs.readdir(tileFolder, (err, protocols) => {\r\n if (err) {\r\n console.log(`Error reading ${tileFolder}: ` + err);\r\n return;\r\n }\r\n if (!protocols || protocols.length === 0) {\r\n console.log(`No sources found in folder ${tileFolder}.`);\r\n return;\r\n }\r\n\r\n protocols.forEach(protocol => {\r\n let sourceFolder = path.join(tileFolder, protocol);\r\n fs.readdir(sourceFolder, (err, files) => {\r\n if (err) {\r\n console.log(`Error reading folder ${protocol}: ${err}`);\r\n return;\r\n }\r\n var tasks: AsyncFunction[] = [];\r\n files.forEach(file => {\r\n switch (protocol) {\r\n case 'tm2':\r\n // case 'mbtiles':\r\n // case 'mapnik':\r\n // case 'carto+file':\r\n tasks.push((cb: Function) => {\r\n this.load('utfgrid+' + protocol, file, '', sourceFolder, cb);\r\n });\r\n break;\r\n }\r\n tasks.push((cb: Function) => {\r\n this.load(protocol, file, '', sourceFolder, cb);\r\n });\r\n });\r\n async.series(tasks);\r\n });\r\n });\r\n });\r\n }\r\n }\r\n\r\n private protocols: string[] = [];\r\n /** Register the protocol. */\r\n private registerProtocol(protocol: string) {\r\n if (this.protocols.indexOf(protocol) >= 0) return;\r\n this.protocols.push(protocol);\r\n if (/utfgrid/.test(protocol)) {\r\n if (this.protocols.indexOf('utfgrid') < 0) {\r\n this.protocols.push('utfgrid');\r\n this.registerProtocol('mbtiles');\r\n require('tilelive-vector' ).registerProtocols(tilelive);\r\n require('tilelive-bridge' ).registerProtocols(tilelive);\r\n require('tilejson' ).registerProtocols(tilelive);\r\n require('tilelive-utfgrid' )(tilelive).registerProtocols(tilelive);\r\n require('tilelive-tmsource')(tilelive).registerProtocols(tilelive);\r\n require('tilelive-http' )(tilelive).registerProtocols(tilelive);\r\n }\r\n console.log(`Registering protocol ${protocol}.`);\r\n this.registerProtocol(protocol.replace('utfgrid+', ''));\r\n return;\r\n }\r\n switch (protocol) {\r\n case 'mapnik':\r\n require('tilelive-mapnik').registerProtocols(tilelive);\r\n break;\r\n case 'tm2':\r\n require('tilelive-tmstyle' )(tilelive).registerProtocols(tilelive);\r\n break;\r\n case 'mbtiles':\r\n require('mbtiles').registerProtocols(tilelive);\r\n break;\r\n default:\r\n require(protocol).registerProtocols(tilelive);\r\n break;\r\n }\r\n console.log(`Registering protocol ${protocol}.`);\r\n }\r\n\r\n /** \r\n * Returns true if your path is absolute.\r\n * See http://stackoverflow.com/questions/21698906/how-to-check-if-a-path-is-absolute-or-relative\r\n */\r\n private pathIsAbsolute(yourPath: string) {\r\n return path.resolve(yourPath) === path.normalize(yourPath).replace( RegExp(path.sep + '$'), '');\r\n }\r\n\r\n /** \r\n * Load a file using the proper protocol.\r\n * NOTE: Only tested for mbtiles.\r\n * \r\n * @param {string} protocol\r\n * @param {string} file\r\n * @param {string} fallbackUri If specified, used to redirect clients when a lookup fails\r\n * @param {string} sourceFolder Source folder. If not specified, the file is absolute.\r\n * @param {Function} callback Callback function to call the function asynchronously.\r\n */\r\n private load(protocol: string, file: string, fallbackUri: string, sourceFolder: string, callback: Function) {\r\n if (file[0] === '_') return;\r\n this.registerProtocol(protocol);\r\n // var re = new RegExp('/[a-zA-Z\\d]*\\/(?\\d+)\\/(?\\d+)\\/(?\\d+)\\./');\r\n let sourceFile = sourceFolder ? path.join(sourceFolder, file) : file;\r\n\r\n var tileliveSource: string;\r\n switch (protocol) {\r\n case 'tm2':\r\n // NOTE I need to remove the drive (host) name, otherwise tmstyle cannot load the data.yml file.\r\n tileliveSource = `tmstyle://${sourceFile.replace(/(.:)/i, '')}`;\r\n break;\r\n case 'utfgrid+tm2':\r\n // NOTE I need to remove the drive (host) name, otherwise tmstyle cannot load the data.yml file.\r\n tileliveSource = `utfgrid+tmstyle://${sourceFile.replace(/(.:)/i, '')}`;\r\n break;\r\n default:\r\n tileliveSource = `${protocol}://${sourceFile}`;\r\n break;\r\n }\r\n\r\n var isUtfGrid = /^utfgrid/.test(protocol);\r\n\r\n tilelive.load(tileliveSource, (err, source) => {\r\n // console.log(`Loading ${tileliveSource}`);\r\n if (err) {\r\n throw err;\r\n }\r\n let name: string;\r\n switch (protocol) {\r\n case 'utfgrid+mapnik':\r\n case 'mapnik':\r\n name = path.basename(file, '.xml');\r\n break;\r\n case 'utfgrid+tm2':\r\n case 'tm2':\r\n name = path.basename(file, '.tm2');\r\n break;\r\n case 'utfgrid+mbtiles':\r\n case 'mbtiles':\r\n name = path.basename(file, '.mbtiles');\r\n break;\r\n }\r\n\r\n if (this.cacheFolder) {\r\n var cachedTileFolder = path.join(this.cacheFolder, name);\r\n this.checkCache(cachedTileFolder, sourceFile);\r\n }\r\n\r\n var ext = isUtfGrid ? 'grid.json' : 'png';\r\n\r\n var urlPath = `/${name}/:z/:x/:y.${ext}`;\r\n console.log(`Exposing ${tileliveSource} service at ${urlPath}.`);\r\n\r\n this.app.get(urlPath, (req, res) => {\r\n let z = +req.params.z,\r\n x = +req.params.x,\r\n y = +req.params.y;\r\n\r\n var dir: string,\r\n filename: string;\r\n\r\n if (this.cacheFolder) {\r\n dir = `${cachedTileFolder}/${z}/${x}`;\r\n filename = `${dir}/${y}.${ext}`;\r\n fs.exists(filename, exists => {\r\n if (exists) {\r\n res.sendFile(filename);\r\n } else {\r\n this.getTile(source, req, res, fallbackUri, dir, filename, x, y, z);\r\n }\r\n });\r\n } else {\r\n this.getTile(source, req, res, fallbackUri, dir, filename, x, y, z);\r\n }\r\n });\r\n callback();\r\n });\r\n }\r\n\r\n /** Get a tile from mapnik */\r\n private getTile(source, req: express.Request, res: express.Response, fallbackUri: string, dir: string, filename: string, x: number, y: number, z: number) {\r\n source.getTile(z, x, y, (err, tile, headers) => {\r\n if (err) {\r\n if (fallbackUri) {\r\n var ext = path.extname(req.url);\r\n var newUrl = `${fallbackUri}/${z}/${x}/${y}${ext}`;\r\n request(newUrl).pipe(res);\r\n // A redirect in the client does not work for Cesium: CORS exception\r\n // res.redirect(`${fallbackUri}/${z}/${x}/${y}${ext}`); // http://stackoverflow.com/questions/11355366/nodejs-redirect-url\r\n } else {\r\n res.status(404);\r\n res.send(err.message);\r\n // console.log('Error getting %s: tile %d, %d, %d', sourceFile, z, x, y);\r\n console.log(err.message);\r\n }\r\n } else {\r\n if (this.cacheFolder) {\r\n mkdirp(dir, err => {\r\n if (err) {\r\n console.error(`Error creating cache folder (${dir}): ${err}`);\r\n } else {\r\n fs.writeFile(filename, headers['Content-Type'] === 'application/json' ? JSON.stringify(tile) : tile, err => {\r\n if (err) throw err;\r\n //console.log('Saved map image to ' + filename);\r\n });\r\n }\r\n });\r\n }\r\n res.set(headers);\r\n res.send(tile);\r\n }\r\n });\r\n }\r\n\r\n /** \r\n * Check whether the cache is still valid, otherwise, delete it. \r\n * \r\n * We compute the hash of the style file and if it doesn't exist, we clear the cache and write it to file as [hash].md5. \r\n * If the file exists, it means that we are dealing with the same source file, and we don't need to do anything.\r\n */\r\n private checkCache(cacheFolder: string, sourceFile: string) {\r\n fs.readFile(sourceFile, (err, buf) => {\r\n let hash = md5(buf);\r\n console.log('MD5 hash: ' + hash);\r\n var md5file = path.join(cacheFolder, hash + '.md5');\r\n fs.exists(md5file, exists => {\r\n if (exists) return;\r\n rmdir(cacheFolder, err => {\r\n if (err) console.error('Error deleting cache: ' + err.message);\r\n mkdirp(cacheFolder, err => {\r\n if (err) {\r\n console.error(`Error creating cache folder (${cacheFolder}): ${err.message}`);\r\n } else {\r\n fs.writeFile(md5file, '', err => {\r\n if (err) console.error('Error writing hash: ' + err.message);\r\n });\r\n }\r\n });\r\n });\r\n });\r\n });\r\n }\r\n\r\n}\r\n"]}