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51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
const mimeTypes = require('./mime-utils-types');
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const mime = {
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fromFileExtension(ext) {
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ext = ext.toLowerCase();
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for (let i = 0; i < mimeTypes.length; i++) {
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const t = mimeTypes[i];
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if (t.e.indexOf(ext) >= 0) {
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return t.t;
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}
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}
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return null;
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},
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fromFilename(name) {
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if (!name) return null;
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const splitted = name.trim().split('.');
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if (splitted.length <= 1) return null;
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return mime.fromFileExtension(splitted[splitted.length - 1]);
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},
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toFileExtension(mimeType) {
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mimeType = mimeType.toLowerCase();
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for (let i = 0; i < mimeTypes.length; i++) {
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const t = mimeTypes[i];
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if (mimeType === t.t) {
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// Return the first file extension that is 3 characters long
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// If none exist return the first one in the list.
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for (let j = 0; j < t.e.length; j++) {
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if (t.e[j].length === 3) return t.e[j];
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}
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return t.e[0];
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}
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}
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return null;
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},
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fromDataUrl(dataUrl) {
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// Example: data:image/jpeg;base64,/9j/4AAQSkZJR.....
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const defaultMime = 'text/plain';
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const p = dataUrl.substr(0, dataUrl.indexOf(',')).split(';');
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let s = p[0];
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s = s.split(':');
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if (s.length <= 1) return defaultMime;
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s = s[1];
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return s.indexOf('/') >= 0 ? s : defaultMime; // https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
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},
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};
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module.exports = { mime };
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