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109 lines
2.7 KiB
JavaScript
109 lines
2.7 KiB
JavaScript
8 months ago
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var path = require('path');
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var fs = require('fs');
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function Mime() {
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// Map of extension -> mime type
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this.types = Object.create(null);
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// Map of mime type -> extension
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this.extensions = Object.create(null);
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}
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/**
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* Define mimetype -> extension mappings. Each key is a mime-type that maps
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* to an array of extensions associated with the type. The first extension is
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* used as the default extension for the type.
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*
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* e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']});
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*
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* @param map (Object) type definitions
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*/
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Mime.prototype.define = function (map) {
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for (var type in map) {
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var exts = map[type];
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for (var i = 0; i < exts.length; i++) {
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if (process.env.DEBUG_MIME && this.types[exts[i]]) {
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console.warn((this._loading || "define()").replace(/.*\//, ''), 'changes "' + exts[i] + '" extension type from ' +
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this.types[exts[i]] + ' to ' + type);
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}
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this.types[exts[i]] = type;
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}
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// Default extension is the first one we encounter
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if (!this.extensions[type]) {
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this.extensions[type] = exts[0];
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}
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}
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};
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/**
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* Load an Apache2-style ".types" file
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*
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* This may be called multiple times (it's expected). Where files declare
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* overlapping types/extensions, the last file wins.
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*
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* @param file (String) path of file to load.
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*/
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Mime.prototype.load = function(file) {
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this._loading = file;
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// Read file and split into lines
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var map = {},
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content = fs.readFileSync(file, 'ascii'),
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lines = content.split(/[\r\n]+/);
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lines.forEach(function(line) {
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// Clean up whitespace/comments, and split into fields
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var fields = line.replace(/\s*#.*|^\s*|\s*$/g, '').split(/\s+/);
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map[fields.shift()] = fields;
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});
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this.define(map);
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this._loading = null;
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};
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/**
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* Lookup a mime type based on extension
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*/
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Mime.prototype.lookup = function(path, fallback) {
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var ext = path.replace(/^.*[\.\/\\]/, '').toLowerCase();
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return this.types[ext] || fallback || this.default_type;
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};
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/**
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* Return file extension associated with a mime type
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*/
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Mime.prototype.extension = function(mimeType) {
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var type = mimeType.match(/^\s*([^;\s]*)(?:;|\s|$)/)[1].toLowerCase();
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return this.extensions[type];
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};
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// Default instance
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var mime = new Mime();
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// Define built-in types
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mime.define(require('./types.json'));
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// Default type
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mime.default_type = mime.lookup('bin');
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//
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// Additional API specific to the default instance
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//
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mime.Mime = Mime;
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/**
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* Lookup a charset based on mime type.
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*/
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mime.charsets = {
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lookup: function(mimeType, fallback) {
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// Assume text types are utf8
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return (/^text\/|^application\/(javascript|json)/).test(mimeType) ? 'UTF-8' : fallback;
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}
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};
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module.exports = mime;
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