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fetch-references.js
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fetch-references.js
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import { mf2tojf2 } from "../index.js";
import { fetchMf2 } from "./fetch-mf2.js";
import { isUrl } from "./is-url.js";
/**
* Get a list of URLs that can be referenced
* @private
* @param {object} jf2 JF2
* @returns {Array} List of URLs that can be referenced
*/
const referenceableUrls = (jf2) => {
const urls = [];
for (const key in jf2) {
if (Object.prototype.hasOwnProperty.call(jf2, key)) {
const value = jf2[key];
if (typeof value === "string" && isUrl(value) && key !== "url") {
urls.push(value);
}
}
}
return urls;
};
/**
* Fetch JF2 properties for each referenced URL
* @param {object} jf2 JF2
* @returns {Promise<object>} JF2 with references
*/
export const fetchReferences = async (jf2) => {
const urls = referenceableUrls(jf2);
const references = jf2.references || {};
for await (const url of urls) {
const mf2 = await fetchMf2(url);
const properties = mf2tojf2(mf2);
references[url] = {
url,
...properties,
};
}
jf2.references = references;
return jf2;
};