72 lines
1.8 KiB
JavaScript
72 lines
1.8 KiB
JavaScript
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'use strict';
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/**
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* Module dependencies.
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*/
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var parse = require('url').parse;
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var debug = require('debug')('get-uri');
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/**
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* Module exports.
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*/
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module.exports = exports = getUri;
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/**
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* Supported "protocols".
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*/
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exports.protocols = {
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data: require('./data'),
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file: require('./file'),
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ftp: require('./ftp'),
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http: require('./http'),
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https: require('./https')
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};
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/**
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* Async function that returns a `stream.Readable` instance to the
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* callback function that will output the contents of the given URI.
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*
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* For caching purposes, you can pass in a `stream` instance from a previous
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* `getUri()` call as a `cache: stream` option, and if the destination has
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* not changed since the last time the endpoint was retreived then the callback
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* will be invoked with an Error object with `code` set to "ENOTMODIFIED" and
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* `null` for the "stream" instance argument. In this case, you can skip
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* retreiving the file again and continue to use the previous payload.
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*
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* @param {String} uri URI to retrieve
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* @param {Object} opts optional "options" object
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* @param {Function} fn callback function
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* @api public
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*/
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function getUri (uri, opts, fn) {
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debug('getUri(%o)', uri);
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if ('function' == typeof opts) {
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fn = opts;
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opts = null;
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}
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if ('function' != typeof fn) {
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throw new TypeError('a callback function must be provided');
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}
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if (!uri) return fn(new TypeError('must pass in a URI to "get"'));
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var parsed = parse(uri);
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var protocol = parsed.protocol;
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if (!protocol) return fn(new TypeError('URI does not contain a protocol: ' + uri));
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// strip trailing :
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protocol = protocol.replace(/\:$/, '');
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var getter = exports.protocols[protocol];
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if ('function' != typeof getter)
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return fn(new TypeError('unsupported protocol "' + protocol + '" specified in URI: ' + uri));
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getter(parsed, opts || {}, fn);
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}
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