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import { parseDataUrlContent } from './util';
const cache = {};
function getCacheKey(url) {
    let key = url.replace(/\?.*/, '');
    // font resourse
    if (/ttf|otf|eot|woff2?/i.test(key)) {
        key = key.replace(/.*\//, '');
    }
    return key;
}
export function getBlobFromURL(url, options) {
    const cacheKey = getCacheKey(url);
    if (cache[cacheKey] != null) {
        return cache[cacheKey];
    }
    // cache bypass so we dont have CORS issues with cached images
    // ref: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
    if (options.cacheBust) {
        // eslint-disable-next-line no-param-reassign
        url += (/\?/.test(url) ? '&' : '?') + new Date().getTime();
    }
    const failed = (reason) => {
        let placeholder = '';
        if (options.imagePlaceholder) {
            const parts = options.imagePlaceholder.split(/,/);
            if (parts && parts[1]) {
                placeholder = parts[1];
            }
        }
        let msg = `Failed to fetch resource: ${url}`;
        if (reason) {
            msg = typeof reason === 'string' ? reason : reason.message;
        }
        if (msg) {
            console.error(msg);
        }
        return {
            blob: placeholder,
            contentType: '',
        };
    };
    const deferred = window
        .fetch(url)
        .then((res) => 
    // eslint-disable-next-line promise/no-nesting
    res.blob().then((blob) => ({
        blob,
        contentType: res.headers.get('Content-Type') || '',
    })))
        .then(({ blob, contentType }) => new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onloadend = () => resolve({
            contentType,
            blob: reader.result,
        });
        reader.onerror = reject;
        reader.readAsDataURL(blob);
    }))
        .then(({ blob, contentType }) => ({
        contentType,
        blob: parseDataUrlContent(blob),
    }))
        // on failed
        .catch(failed);
    // cache result
    cache[cacheKey] = deferred;
    return deferred;
}
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