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joplin/packages/lib/mime-utils.js

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const mimeTypes = require('./mime-utils-types');
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const mime = {
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fromFileExtension(ext) {
ext = ext.toLowerCase();
for (let i = 0; i < mimeTypes.length; i++) {
const t = mimeTypes[i];
if (t.e.indexOf(ext) >= 0) {
return t.t;
}
}
return null;
},
fromFilename(name) {
if (!name) return null;
const splitted = name.trim().split('.');
if (splitted.length <= 1) return null;
return mime.fromFileExtension(splitted[splitted.length - 1]);
},
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toFileExtension(mimeType) {
mimeType = mimeType.toLowerCase();
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
// If none exist return the first one in the list.
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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}
return t.e[0];
}
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}
return null;
},
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fromDataUrl(dataUrl) {
// Example: data:image/jpeg;base64,/9j/4AAQSkZJR.....
const defaultMime = 'text/plain';
const p = dataUrl.substr(0, dataUrl.indexOf(',')).split(';');
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let s = p[0];
s = s.split(':');
if (s.length <= 1) return defaultMime;
s = s[1];
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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module.exports = { mime };