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index.js
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index.js
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'use strict';
async function fetchImage(url, callback, headers, abort) {
let _headers = {};
if (headers) {
headers.forEach(h => {
_headers[h.header] = h.value;
});
}
const controller = new AbortController();
const signal = controller.signal;
if (abort) {
abort.subscribe(() => {
controller.abort();
});
}
const f = await fetch(url, {
method: "GET",
headers: _headers,
mode: "cors",
signal: signal
});
const blob = await f.blob();
callback(blob);
}
L.TileLayer.WMSHeader = L.TileLayer.WMS.extend({
initialize: function (url, options, headers, abort, results) {
L.TileLayer.WMS.prototype.initialize.call(this, url, options);
this.headers = headers;
this.abort = abort;
this.results = results;
},
createTile(coords, done) {
const url = this.getTileUrl(coords);
const img = document.createElement("img");
img.setAttribute("role", "presentation");
self = this;
fetchImage(
url,
resp => {
const reader = new FileReader();
reader.onload = () => {
img.src = reader.result;
if (self.results) {
self.results.next(reader.result);
};
};
reader.readAsDataURL(resp);
done(null, img);
},
this.headers,
this.abort
);
return img;
}
});
L.TileLayer.wmsHeader = function (url, options, headers, abort, results) {
return new L.TileLayer.WMSHeader(url, options, headers, abort, results);
};