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Ghost/core/server/utils/cached-image-size-from-url.js
2017-12-12 10:28:13 +01:00

50 lines
1.6 KiB
JavaScript

var debug = require('ghost-ignition').debug('utils:image-size-cache'),
imageSize = require('./image-size'),
logging = require('../lib/common/logging'),
errors = require('../lib/common/errors'),
imageSizeCache = {};
/**
* Get cached image size from URL
* Always returns {object} imageSizeCache
* @param {string} url
* @returns {Promise<Object>} imageSizeCache
* @description Takes a url and returns image width and height from cache if available.
* If not in cache, `getImageSizeFromUrl` is called and returns the dimensions in a Promise.
*/
function getCachedImageSizeFromUrl(url) {
if (!url || url === undefined || url === null) {
return;
}
// image size is not in cache
if (!imageSizeCache[url]) {
return imageSize.getImageSizeFromUrl(url).then(function (res) {
imageSizeCache[url] = res;
debug('Cached image:', url);
return imageSizeCache[url];
}).catch(errors.NotFoundError, function () {
debug('Cached image (not found):', url);
// in case of error we just attach the url
imageSizeCache[url] = url;
return imageSizeCache[url];
}).catch(function (err) {
debug('Cached image (error):', url);
logging.error(err);
// in case of error we just attach the url
imageSizeCache[url] = url;
return imageSizeCache[url];
});
}
debug('Read image from cache:', url);
// returns image size from cache
return imageSizeCache[url];
}
module.exports = getCachedImageSizeFromUrl;