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/**
* request-image-size: Detect image dimensions via request.
* Licensed under the MIT license.
*
* https://github.com/FdezRomero/request-image-size
* © 2017 Rodrigo Fernández Romero
*
* Based on the work of Johannes J. Schmidt
* https://github.com/jo/http-image-size
*/
// const imageSize = require('image-size');
import * as HttpError from 'standard-http-error';
import * as request from 'request';
import { imageSize } from 'image-size';
import { ISizeCalculationResult } from 'image-size/dist/types/interface';
export function requestImageSize(url: string): Promise<ISizeCalculationResult> {
if (!url) {
return Promise.reject(new Error('You should provide an URI string or a "request" options object.'));
}
return new Promise((resolve, reject) => {
const req = request(url);
req.on('response', res => {
if (res.statusCode >= 400) {
reject(new HttpError(res.statusCode, res.statusMessage));
return;
}
let buffer = Buffer.from([]);
let size: ISizeCalculationResult;
res.on('data', chunk => {
buffer = Buffer.concat([buffer, chunk]);
});
res.on('error', reject);
res.on('end', () => {
try {
size = imageSize(buffer);
if (size) {
resolve(size);
req.abort();
}
} catch (err) {
/* empty */
console.log('Error: ', err);
}
if (!size) {
reject(new Error('Image has no size'));
return;
}
resolve(size);
});
});
req.on('error', reject);
});
}
export default requestImageSize;
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