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function getContentFromDataUrl(dataURL) {
return dataURL.split(/,/)[1];
}
export function isDataUrl(url) {
return url.search(/^(data:)/) !== -1;
}
export function makeDataUrl(content, mimeType) {
return `data:${mimeType};base64,${content}`;
}
export async function fetchAsDataURL(url, init, process) {
const res = await fetch(url, init);
if (res.status === 404) {
throw new Error(`Resource "${res.url}" not found`);
}
const blob = await res.blob();
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onerror = reject;
reader.onloadend = () => {
try {
resolve(process({ res, result: reader.result }));
}
catch (error) {
reject(error);
}
};
reader.readAsDataURL(blob);
});
}
const cache = {};
function getCacheKey(url, contentType, includeQueryParams) {
let key = url.replace(/\?.*/, '');
if (includeQueryParams) {
key = url;
}
// font resource
if (/ttf|otf|eot|woff2?/i.test(key)) {
key = key.replace(/.*\//, '');
}
return contentType ? `[${contentType}]${key}` : key;
}
export async function resourceToDataURL(resourceUrl, contentType, options) {
const cacheKey = getCacheKey(resourceUrl, contentType, options.includeQueryParams);
if (cache[cacheKey] != null) {
return cache[cacheKey];
}
// 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
resourceUrl += (/\?/.test(resourceUrl) ? '&' : '?') + new Date().getTime();
}
let dataURL;
try {
const content = await fetchAsDataURL(resourceUrl, options.fetchRequestInit, ({ res, result }) => {
if (!contentType) {
// eslint-disable-next-line no-param-reassign
contentType = res.headers.get('Content-Type') || '';
}
return getContentFromDataUrl(result);
});
dataURL = makeDataUrl(content, contentType);
}
catch (error) {
dataURL = options.imagePlaceholder || '';
let msg = `Failed to fetch resource: ${resourceUrl}`;
if (error) {
msg = typeof error === 'string' ? error : error.message;
}
if (msg) {
console.warn(msg);
}
}
cache[cacheKey] = dataURL;
return dataURL;
}
//# sourceMappingURL=dataurl.js.map |