/*!
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* qn - lib/dl.js
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* Copyright(c) 2013 fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)
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* MIT Licensed
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*/
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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 debug = require('debug')('qn:dl');
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var utility = require('utility');
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function deadline() {
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return utility.timestamp() + 3600;
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}
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exports.downloadToken = function (url) {
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return this.options.accessKey + ':' + this.signData(url);
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};
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/**
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* Download a file
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*
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* @param {String} key
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* @param {Object} [options]
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* - {Number} [timeout] default is `global.options.downloadTimeout` one hour.
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* - {WriteStream} [writeStream] writable stream to save response data.
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* If you use this, callback's data should be null.
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* We will just `pipe(ws, {end: true})`.
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* @param {Function(err, content, res)} callback
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*/
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exports.download = function (key, options, callback) {
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if (typeof options === 'function') {
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callback = options;
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options = null;
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}
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options = options || {};
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options.timeout = options.timeout || this.downloadTimeout;
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var url = this.resourceURL(key) + '?e=' + deadline();
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var token = this.downloadToken(url);
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url += '&token=' + token;
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debug('download %s, timeout %d', url, options.timeout);
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this._request(url, options, callback);
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};
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exports.saveAsURL = function (key, name) {
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return this.resourceURL(key) + '?download/' + encodeURIComponent(name);
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};
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