44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
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// Cache system is a bit outdated and could do with work
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export default (window, options, logger) => {
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let cache = null;
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if (options.env !== 'development') {
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try {
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cache = (typeof window.localStorage === 'undefined') ? null : window.localStorage;
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} catch (_) {}
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}
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return {
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setCSS: function(path, lastModified, modifyVars, styles) {
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if (cache) {
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logger.info(`saving ${path} to cache.`);
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try {
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cache.setItem(path, styles);
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cache.setItem(`${path}:timestamp`, lastModified);
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if (modifyVars) {
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cache.setItem(`${path}:vars`, JSON.stringify(modifyVars));
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}
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} catch (e) {
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// TODO - could do with adding more robust error handling
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logger.error(`failed to save "${path}" to local storage for caching.`);
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}
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}
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},
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getCSS: function(path, webInfo, modifyVars) {
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const css = cache && cache.getItem(path);
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const timestamp = cache && cache.getItem(`${path}:timestamp`);
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let vars = cache && cache.getItem(`${path}:vars`);
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modifyVars = modifyVars || {};
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vars = vars || "{}"; // if not set, treat as the JSON representation of an empty object
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if (timestamp && webInfo.lastModified &&
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(new Date(webInfo.lastModified).valueOf() ===
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new Date(timestamp).valueOf()) &&
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JSON.stringify(modifyVars) === vars) {
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// Use local copy
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return css;
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}
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}
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};
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};
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