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102 lines
2.8 KiB
102 lines
2.8 KiB
2 years ago
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var fs = require('graceful-fs');
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var Promise = require('bluebird');
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var directory = require('./directory');
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var Stream = require('stream');
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// Backwards compatibility for node versions < 8
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if (!Stream.Writable || !Stream.Writable.prototype.destroy)
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Stream = require('readable-stream');
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module.exports = {
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buffer: function(buffer, options) {
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var source = {
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stream: function(offset, length) {
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var stream = Stream.PassThrough();
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stream.end(buffer.slice(offset, length));
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return stream;
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},
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size: function() {
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return Promise.resolve(buffer.length);
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}
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};
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return directory(source, options);
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},
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file: function(filename, options) {
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var source = {
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stream: function(offset,length) {
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return fs.createReadStream(filename,{start: offset, end: length && offset+length});
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},
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size: function() {
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return new Promise(function(resolve,reject) {
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fs.stat(filename,function(err,d) {
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if (err)
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reject(err);
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else
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resolve(d.size);
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});
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});
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}
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};
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return directory(source, options);
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},
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url: function(request, params, options) {
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if (typeof params === 'string')
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params = {url: params};
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if (!params.url)
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throw 'URL missing';
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params.headers = params.headers || {};
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var source = {
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stream : function(offset,length) {
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var options = Object.create(params);
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options.headers = Object.create(params.headers);
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options.headers.range = 'bytes='+offset+'-' + (length ? length : '');
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return request(options);
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},
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size: function() {
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return new Promise(function(resolve,reject) {
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var req = request(params);
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req.on('response',function(d) {
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req.abort();
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if (!d.headers['content-length'])
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reject(new Error('Missing content length header'));
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else
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resolve(d.headers['content-length']);
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}).on('error',reject);
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});
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}
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};
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return directory(source, options);
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},
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s3 : function(client,params, options) {
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var source = {
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size: function() {
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return new Promise(function(resolve,reject) {
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client.headObject(params, function(err,d) {
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if (err)
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reject(err);
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else
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resolve(d.ContentLength);
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});
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});
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},
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stream: function(offset,length) {
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var d = {};
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for (var key in params)
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d[key] = params[key];
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d.Range = 'bytes='+offset+'-' + (length ? length : '');
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return client.getObject(d).createReadStream();
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}
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};
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return directory(source, options);
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},
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custom: function(source, options) {
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return directory(source, options);
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}
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};
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