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ajax.js
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ajax.js
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// @flow
import window from './window';
import type { Callback } from '../types/callback';
/**
* The type of a resource.
* @private
* @readonly
* @enum {string}
*/
const ResourceType = {
Unknown: 'Unknown',
Style: 'Style',
Source: 'Source',
Tile: 'Tile',
Glyphs: 'Glyphs',
SpriteImage: 'SpriteImage',
SpriteJSON: 'SpriteJSON',
Image: 'Image'
};
export { ResourceType };
if (typeof Object.freeze == 'function') {
Object.freeze(ResourceType);
}
/**
* A `RequestParameters` object to be returned from Map.options.transformRequest callbacks.
* @typedef {Object} RequestParameters
* @property {string} url The URL to be requested.
* @property {Object} headers The headers to be sent with the request.
* @property {string} credentials `'same-origin'|'include'` Use 'include' to send cookies with cross-origin requests.
*/
export type RequestParameters = {
url: string,
headers?: Object,
credentials?: 'same-origin' | 'include',
collectResourceTiming?: boolean
};
class AJAXError extends Error {
status: number;
url: string;
constructor(message: string, status: number, url: string) {
super(message);
this.status = status;
this.url = url;
// work around for https://github.com/Rich-Harris/buble/issues/40
this.name = this.constructor.name;
this.message = message;
}
toString() {
return `${this.name}: ${this.message} (${this.status}): ${this.url}`;
}
}
function makeRequest(requestParameters: RequestParameters): XMLHttpRequest {
const xhr: XMLHttpRequest = new window.XMLHttpRequest();
xhr.open('GET', requestParameters.url, true);
for (const k in requestParameters.headers) {
xhr.setRequestHeader(k, requestParameters.headers[k]);
}
xhr.withCredentials = requestParameters.credentials === 'include';
return xhr;
}
export const getJSON = function(requestParameters: RequestParameters, callback: Callback<mixed>) {
const xhr = makeRequest(requestParameters);
xhr.setRequestHeader('Accept', 'application/json');
xhr.onerror = function() {
callback(new Error(xhr.statusText));
};
xhr.onload = function() {
if (xhr.status >= 200 && xhr.status < 300 && xhr.response) {
let data;
try {
data = JSON.parse(xhr.response);
} catch (err) {
return callback(err);
}
callback(null, data);
} else {
if (xhr.status === 401 && requestParameters.url.match(/mapbox.com/)) {
callback(new AJAXError(`${xhr.statusText}: you may have provided an invalid Mapbox access token. See https://www.mapbox.com/api-documentation/#access-tokens`, xhr.status, requestParameters.url));
} else {
callback(new AJAXError(xhr.statusText, xhr.status, requestParameters.url));
}
}
};
xhr.send();
return xhr;
};
export const getArrayBuffer = function(requestParameters: RequestParameters, callback: Callback<{data: ArrayBuffer, cacheControl: ?string, expires: ?string}>) {
const xhr = makeRequest(requestParameters);
xhr.responseType = 'arraybuffer';
xhr.onerror = function() {
callback(new Error(xhr.statusText));
};
xhr.onload = function() {
const response: ArrayBuffer = xhr.response;
if (response.byteLength === 0 && xhr.status === 200) {
return callback(new Error('http status 200 returned without content.'));
}
if (xhr.status >= 200 && xhr.status < 300 && xhr.response) {
callback(null, {
data: response,
cacheControl: xhr.getResponseHeader('Cache-Control'),
expires: xhr.getResponseHeader('Expires')
});
} else {
callback(new AJAXError(xhr.statusText, xhr.status, requestParameters.url));
}
};
xhr.send();
return xhr;
};
function sameOrigin(url) {
const a: HTMLAnchorElement = window.document.createElement('a');
a.href = url;
return a.protocol === window.document.location.protocol && a.host === window.document.location.host;
}
const transparentPngUrl = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAC0lEQVQYV2NgAAIAAAUAAarVyFEAAAAASUVORK5CYII=';
export const getImage = function(requestParameters: RequestParameters, callback: Callback<HTMLImageElement>) {
// request the image with XHR to work around caching issues
// see https://github.com/mapbox/mapbox-gl-js/issues/1470
return getArrayBuffer(requestParameters, (err, imgData) => {
if (err) {
callback(err);
} else if (imgData) {
const img: HTMLImageElement = new window.Image();
const URL = window.URL || window.webkitURL;
img.onload = () => {
callback(null, img);
URL.revokeObjectURL(img.src);
};
const blob: Blob = new window.Blob([new Uint8Array(imgData.data)], { type: 'image/png' });
(img: any).cacheControl = imgData.cacheControl;
(img: any).expires = imgData.expires;
img.src = imgData.data.byteLength ? URL.createObjectURL(blob) : transparentPngUrl;
}
});
};
export const getVideo = function(urls: Array<string>, callback: Callback<HTMLVideoElement>) {
const video: HTMLVideoElement = window.document.createElement('video');
video.muted = true;
video.onloadstart = function() {
callback(null, video);
};
for (let i = 0; i < urls.length; i++) {
const s: HTMLSourceElement = window.document.createElement('source');
if (!sameOrigin(urls[i])) {
video.crossOrigin = 'Anonymous';
}
s.src = urls[i];
video.appendChild(s);
}
return video;
};