@seasketch/geoprocessing/dist/src/datasources/seasketch.js

Geoprocessing and reporting framework for SeaSketch 2.0

import geobuf from "geobuf";
import Pbf from "pbf";
import isHostedOnLambda from "./isHostedOnLambda.js";
// Seasketch client
/**
 * Given geoprocessing function request, fetches the GeoJSON, which can also be sketch JSON
 * @param request
 * @returns the JSON with geometry type optionally specified by request
 */
export const fetchGeoJSON = async (request) => {
    if (request.geometryGeobuf) {
        const sketchU8 = new Uint8Array(Buffer.from(request.geometryGeobuf, "base64"));
        return geobuf.decode(new Pbf(sketchU8));
    }
    if (request.geometry) {
        return request.geometry;
    }
    else if (request.geometryUri) {
        if (request.geometryUri.startsWith("data:")) {
            // data-uri
            const data = Buffer.from(request.geometryUri.split(",")[1], "base64");
            if (/application\/json/.test(request.geometryUri)) {
                // json
                return JSON.parse(data.toString());
            }
            else if (/application\/x-protobuf/.test(request.geometryUri)) {
                // protobuf
                // TODO: implement geobuf support
                throw new Error("application/x-protobuf not yet supported");
            }
            else {
                throw new Error("Unknown mime type in data-uri");
            }
        }
        else {
            // fetch geometry from endpoint
            if (isHostedOnLambda) {
                console.time(`Fetch sketch from ${request.geometryUri}`);
            }
            const response = await fetch(request.geometryUri, 
            // only send Authorization header if token is provided
            request.token
                ? {
                    headers: {
                        Authorization: request.token,
                    },
                }
                : {});
            const sketch = await response.json();
            if (isHostedOnLambda) {
                console.timeEnd(`Fetch sketch from ${request.geometryUri}`);
            }
            return sketch;
        }
    }
    else {
        throw new Error("No geometry or geometryUri present on request");
    }
};
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