63 lines
2.2 KiB
JavaScript
63 lines
2.2 KiB
JavaScript
/* @flow */
|
|
'use strict';
|
|
|
|
import type Options from './index';
|
|
|
|
import FEATURES from './Feature';
|
|
|
|
export const Proxy = (src: string, options: Options): Promise<string> => {
|
|
if (!options.proxy) {
|
|
return Promise.reject(__DEV__ ? 'No proxy defined' : null);
|
|
}
|
|
const proxy = options.proxy;
|
|
|
|
return new Promise((resolve, reject) => {
|
|
const responseType =
|
|
FEATURES.SUPPORT_CORS_XHR && FEATURES.SUPPORT_RESPONSE_TYPE ? 'blob' : 'text';
|
|
const xhr = FEATURES.SUPPORT_CORS_XHR ? new XMLHttpRequest() : new XDomainRequest();
|
|
xhr.onload = () => {
|
|
if (xhr instanceof XMLHttpRequest) {
|
|
if (xhr.status === 200) {
|
|
if (responseType === 'text') {
|
|
resolve(xhr.response);
|
|
} else {
|
|
const reader = new FileReader();
|
|
// $FlowFixMe
|
|
reader.addEventListener('load', () => resolve(reader.result), false);
|
|
// $FlowFixMe
|
|
reader.addEventListener('error', e => reject(e), false);
|
|
reader.readAsDataURL(xhr.response);
|
|
}
|
|
} else {
|
|
reject(
|
|
__DEV__
|
|
? `Failed to proxy resource ${src.substring(
|
|
0,
|
|
256
|
|
)} with status code ${xhr.status}`
|
|
: ''
|
|
);
|
|
}
|
|
} else {
|
|
resolve(xhr.responseText);
|
|
}
|
|
};
|
|
|
|
xhr.onerror = reject;
|
|
xhr.open('GET', `${proxy}?url=${encodeURIComponent(src)}&responseType=${responseType}`);
|
|
|
|
if (responseType !== 'text' && xhr instanceof XMLHttpRequest) {
|
|
xhr.responseType = responseType;
|
|
}
|
|
|
|
if (options.imageTimeout) {
|
|
const timeout = options.imageTimeout;
|
|
xhr.timeout = timeout;
|
|
xhr.ontimeout = () =>
|
|
reject(__DEV__ ? `Timed out (${timeout}ms) proxying ${src.substring(0, 256)}` : '');
|
|
}
|
|
|
|
xhr.send();
|
|
});
|
|
};
|