43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
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// Cache system is a bit outdated and could do with work
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module.exports = function(window, options, logger) {
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var 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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var css = cache && cache.getItem(path),
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timestamp = cache && cache.getItem(path + ':timestamp'),
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vars = cache && cache.getItem(path + ':vars');
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modifyVars = modifyVars || {};
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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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(!modifyVars && !vars || 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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