Add an express demo for metadata apis, upload/download

This commit is contained in:
Raymond Feng 2013-06-26 14:43:53 -07:00
parent 9b0fe46fbd
commit d6b89fe2ef
3 changed files with 156 additions and 0 deletions

67
example/upload.js Normal file
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var Uploader = require('../lib/storage-handler.js');
var express = require('express');
var app = express();
app.configure(function () {
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.favicon());
// app.use(express.logger('dev'));
app.use(express.methodOverride());
app.use(app.router);
});
var handler = new Uploader({provider: 'filesystem', root: '/tmp/storage'});
app.get('/', function (req, res, next) {
res.setHeader('Content-Type', 'text/html');
var form = "<html><body><form method='POST' enctype='multipart/form-data' action='/upload/c1'>"
+ " File to upload: <input type=file name=upfile><br>"
+ " Notes about the file: <input type=text name=note><br>"
+ " <input type=submit value=Upload></form></body></html>";
res.send(form);
res.end();
});
app.post('/upload/:container', function (req, res, next) {
handler.processUpload(req, res, function (err, result) {
if (!err) {
res.setHeader('Content-Type', 'application/json');
res.send(200, result);
} else {
res.send(500, err);
}
});
});
app.get('/download', function (req, res, next) {
handler.client.getContainers(function (err, containers) {
var html = "<body><h1>Containers</h1><ul>";
containers.forEach(function (f) {
html += "<li><a href='" + f.name + "'>" + f.name + "</a></li>"
});
res.send(200, html);
});
});
app.get('/download/:container', function (req, res, next) {
handler.client.getFiles(req.params.container, function (err, files) {
var html = "<body><h1>Files</h1><ul>";
files.forEach(function (f) {
html += "<li><a href='" + f.container + "/" + f.name + "'>" + f.container + "/" + f.name + "</a></li>"
});
res.send(200, html);
});
});
app.get('/download/:container/:file', function (req, res, next) {
handler.processDownload(req, res, function (err, result) {
if (err) {
res.send(500, err);
}
});
});
app.listen(app.get('port'));

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lib/storage-handler.js Normal file
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var factory = require('./index');
var IncomingForm = require('formidable');
var StringDecoder = require('string_decoder').StringDecoder;
module.exports = Uploader;
function Uploader(options) {
if (!(this instanceof Uploader)) {
return new Uploader(options);
}
this.client = factory.createClient(options);
this.options = options;
}
Uploader.prototype.processUpload = function (req, res, cb) {
var client = this.client;
var form = new IncomingForm(this.options);
var container = req.params.container;
var fields = {};
var files = {};
form.handlePart = function (part) {
var self = this;
if (part.filename === undefined) {
var value = ''
, decoder = new StringDecoder(this.encoding);
part.on('data', function (buffer) {
self._fieldsSize += buffer.length;
if (self._fieldsSize > self.maxFieldsSize) {
self._error(new Error('maxFieldsSize exceeded, received ' + self._fieldsSize + ' bytes of field data'));
return;
}
value += decoder.write(buffer);
});
part.on('end', function () {
fields[part.name] = value;
self.emit('field', part.name, value);
});
return;
}
this._flushing++;
var writer = client.upload({container: container, remote: part.filename});
part.on('data', function (buffer) {
self.pause();
writer.write(buffer, function () {
self.resume();
});
});
part.on('end', function () {
writer.end(function () {
self._flushing--;
files[part.name] = part.filename;
self._maybeEnd();
});
});
};
form.parse(req, function (err, result) {
console.log(result);
cb && cb(err, {files: files, fields: fields});
});
}
Uploader.prototype.processDownload = function(req, res, cb) {
var reader = this.client.download({
container: req.params.container,
remote: req.params.file
});
reader.pipe(res);
reader.on('error', function(err) {
cb && cb(err);
});
reader.on('end', function(err, result) {
cb && cb(err, result);
});
}

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"async": "latest" "async": "latest"
}, },
"devDependencies": { "devDependencies": {
"express": "latest",
"formidable": "latest",
"mocha": "latest", "mocha": "latest",
"supertest": "latest" "supertest": "latest"
}, },