fs.js

/*
 Copyright 2011 Marek Jelen

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

var FS = require('fs');

var Path = require('path');

Driver = function () {
    var self = this;

    // Setup
    self.setup = function (callback) {
        callback();
    };

    // Handles file listing
    self.handleListFiles = function (response, ruid, appid) {
        self.log.debug('(' + ruid + ') Listing files for ' + appid);
        FS.readdir('data/' + appid, function (error, files) {
            if (error) {
                response.writeHead(404, {});
                response.end();
                return;
            }
            for (file in files) {
                response.write(files[file] + "\n");
            }
            response.end();
        });
    };

    // Handles file downloads
    self.handleDownload = function (response, ruid, appid, path, request) {
        self.log.debug('(' + ruid + ') Downloading file ' + path + ' for ' + appid);
        var filepath = self.configuration.fs.dir + '/' + appid + '/' + path;
        FS.stat(filepath, function (error, stat) {
            if (error) {
                response.writeHead(404, {});
                response.end();
                return;
            }
            stream = FS.createReadStream(filepath);
            response.writeHead(200, {
                'Content-length':stat.size
            });
            stream.pipe(response);
            response.on('close', function () {
                self.log.debug('(' + ruid + ') File downloaded');
            });
        });
    };


    // Handles file uploads
    self.handleUpload = function (response, ruid, appid, path, request) {
        self.log.debug('(' + ruid + ') Uploading file ' + path + ' for ' + appid);
        var dir = self.configuration.fs.dir + '/' + appid;
        var filepath = dir + '/' + path;
        var buffer = [];
        var onData = function (chunk) {
            buffer.push(chunk);
        };
        request.addListener('data', onData);
        request.pause();
        FS.mkdir(dir, function (error) {
            if (error) {
                response.writeHead(500, {});
                response.end();
            }
            stream = FS.createWriteStream(filepath);
            request.removeListener('data', onData);
            for (chunk in buffer) {
                stream.write(buffer[chunk]);
            }
            request.resume();
            request.pipe(stream, { end:false });
            stream.on('error', function (error) {
                response.end(error.toString());
            });
            request.on('end', function () {
                stream.destroySoon();
                self.log.debug('(' + ruid + ') File uploaded');
                response.end('OK');
            });
        });
    };

    // Handles file deletions
    self.handleDelete = function (response, ruid, appid, path) {
        self.log.debug('(' + ruid + ') Deleting file ' + path + ' for ' + appid);
        var filepath = self.configuration.fs.dir + '/' + appid + '/' + path;
        FS.stat(filepath, function (error, stat) {
            if (error) {
                response.writeHead(404, {});
                response.end();
                return;
            }
            FS.unlink(filepath, function () {
                self.log.debug('(' + ruid + ') File deleted');
                response.end('OK');
            });
        });
    };

};

exports.driver = Driver;