geojson-tile-server
Version:
A simple tile service, that takes one or more GeoJSON files and offers them as slippy maps in MVT, VT or GeoJSON format.
152 lines • 7.73 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createService = void 0;
var path = require("path");
var express = require("express");
var cors = require("cors");
var vtpbf = require("vt-pbf");
var utils_1 = require("./utils");
var vt2geojson_1 = require("./vt2geojson");
/** GeojsonVT extent option */
var extent = 4096;
var emptyResponse = { tile: undefined, x: 0, y: 0, z: 0 };
var startService = function (filenames, options) { return __awaiter(void 0, void 0, void 0, function () {
var tileIndexes, countFiles, httpPort, app, extensions, ulList, send404, getTile;
return __generator(this, function (_a) {
if (typeof filenames === "string") {
filenames = [filenames];
}
tileIndexes = {};
countFiles = filenames.length;
filenames.forEach(function (f) { return __awaiter(void 0, void 0, void 0, function () {
var layerName, tileIndex;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
layerName = path.basename(f).replace(path.extname(f), "");
console.log("Processing layer " + layerName + "...");
return [4 /*yield*/, utils_1.createTileIndex(f, {
extent: extent,
maxZoom: options.maxZoom,
generateId: options.generatedId,
promoteId: options.promoteId,
buffer: options.buffer,
})];
case 1:
tileIndex = _a.sent();
tileIndexes[layerName] = tileIndex;
countFiles--;
if (countFiles <= 0) {
console.log("Finished loading the layers.");
}
return [2 /*return*/];
}
});
}); });
httpPort = options.port || process.env.PORT || 8123;
app = express();
app.use(cors());
app.use(express.static(process.env.PUBLIC_FOLDER || options.static));
extensions = [
"geojson",
'mvt (for MapBox GL, use source-layer: "all")',
"vt",
];
ulList = function (l) {
return "<ul>" +
extensions.map(function (ext) { return "<li>" + l + "/{z}/{x}/{y}." + ext + "</li>"; }).join("\n") +
"</ul>";
};
send404 = function (res) {
var availableLayers = Object.keys(tileIndexes);
var list = availableLayers
.sort()
.map(function (l) { return "<ol><li>" + ulList(l) + "</li></ol>"; })
.join("\n");
res.status(404).send("<h1>Layer not found</h1>\n <p>Available layers are:\n " + list + "\n </p>");
};
getTile = function (req, res) {
var layer = req.params["layer"];
if (!tileIndexes.hasOwnProperty(layer)) {
send404(res);
return emptyResponse;
}
var z = +req.params["z"];
var x = +req.params["x"];
var y = +req.params["y"];
var tile = tileIndexes[layer].getTile(z, x, y);
return { tile: tile, x: x, y: y, z: z };
};
app.get("/", function (_, res) { return send404(res); });
app.get("/:layer/:z/:x/:y.geojson", function (req, res) {
var _a = getTile(req, res), tile = _a.tile, _b = _a.x, x = _b === void 0 ? 0 : _b, _c = _a.y, y = _c === void 0 ? 0 : _c, _d = _a.z, z = _d === void 0 ? 0 : _d;
if (!tile || !tile.features) {
return res.json({});
}
var vectorTiles = tile.features;
res.json(vt2geojson_1.toFeatureCollection(vectorTiles, x, y, z, extent));
});
app.get("/:layer/:z/:x/:y.vt", function (req, res) {
var tile = getTile(req, res).tile;
if (!tile || !tile.features) {
return;
}
var vectorTiles = tile.features;
res.json(vectorTiles);
});
app.get("/:layer/:z/:x/:y.mvt", function (req, res) {
var tile = getTile(req, res).tile;
if (!tile || !tile.features) {
return;
}
/** Notice that I set the source-layer (for Mapbox GL) to all */
res.send(Buffer.from(vtpbf.fromGeojsonVt({ all: tile })));
});
app.listen(httpPort, function () {
return console.info("Tile service is listening on port " + httpPort);
});
return [2 /*return*/];
});
}); };
exports.createService = function (options) {
var dataFolder = path.resolve(options.data || process.env.DATAFOLDER || "./data");
console.log("Reading GeoJSON files from " + dataFolder);
startService(utils_1.findGeojsonFilesInFolder(dataFolder), options);
};
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