Pithos_GSS » Pithos Firefox extension

// The Pithos File Manager Firefox Extension is funded by GRNET S.A.

// (http://www.grnet.gr)

//

// Copyright (c) 2009, Christos KK Loverdos, Vassilios Karakoidas.

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//   - Redistributions of source code must retain the above copyright

//     notice, this list of conditions and the following disclaimer.

//   - Redistributions in binary form must reproduce the above

//     copyright notice, this list of conditions and the following

//     disclaimer in the documentation and/or other materials provided

//     with the distribution.

//   - Neither the name of GRNET S.A. nor the names of its contributors

//     may be used to endorse or promote products derived from this

//     software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vfs = null;

function VFS() {

        // public properties

        // private properties

        var special_files = {};

        // public methods

        // Always returns a json object

        this.getDirectory = function(uri) {

                if ( uri.indexOf(connection_obj.rest_url + '/search/') >= 0 ) {

                        return getSearchResult(uri, JSON.parse(connection_obj.rest_request_get(uri, '').responseText));

                }

                var r = special_files[uri];

                // is not a special file

                if ( r == undefined ) {

                        return load_directory_sync(uri);

                }

                return r(); // return the special case

        }

    this.getResourceAsBinary = function(uri) {

        if ( this.isRemoteResource(uri) ) {

            var req = connection_obj.rest_request_get_inline(uri);

            if ( connection_obj.success(req.status) ) {

                return req.responseText;

            } else {

                return null;

            }

        } else if ( this.isLocalResource(uri) ) {

            return loadBinaryFile(uri);

        }

        return null;

    }

        // Returns the metadata as a json object

        this.getResourceMetadata = function(uri) {

                var fm_obj = null;

                if ( this.isRemoteResource(uri) ) {

                        if ( uri.charAt(uri.length - 1) == '/' ) {

                                // is directory

                                fm_obj = this.getDirectory(uri);

                        } else {

                                // is file

                                var req = connection_obj.rest_request_head(uri, '?' + Math.random());

                                fm_obj = JSON.parse(req.getResponseHeader('X-GSS-Metadata'));                                

                        }

                } else if ( this.isLocalResource(uri) ) {

                        if ( this.isDirectory(uri) ) {

                                fm_obj = load_local_directory(uri);

                        } else {

                                fm_obj = loadLocalFile(uri);

                        }

                }

                return fm_obj;

        }

        this.isRemoteResource = function(uri) {

                return (uri.indexOf('http') != -1);

        }

        this.isLocalResource = function(uri) {

                return !this.isRemoteResource(uri);

        }

        this.isDirectory = function(uri) {

                if ( this.isRemoteResource(uri)) {

                        return (uri.charAt(uri.length - 1) == '/');

                } else if ( this.isLocalResource(uri)) {

                        try {

                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect UniversalFileRead UniversalBrowserRead");

                                var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);

                                file.initWithPath(uri);

                                return file.isDirectory();

                        } catch (error) {

                                return false;

                        }

                }

        }

        this.isFile = function(uri) {

                return !this.isDirectory(uri);                

        }

        // private methods

        // 

        function load_directory_sync(uri) {

                var d = cache.get(uri);

                if (d == undefined) {

                        if ( vfs.isRemoteResource(uri) ) {

                                // remote dir, do a json call

                                var req = connection_obj.rest_request_sync(uri, '');

                                var rt = req.responseText;

                                if (rt.length == 0) { rt = "{}"; }

                                return (new Directory(uri, JSON.parse(rt)));

                        } else if ( vfs.isLocalResource(uri) ) {

                                // local dir

                                return (new Directory(uri, load_local_directory(uri)));

                        }

                }

                return d;

        }

        // init special files

        // Handle cases where we do not have normal directory structure

        special_files[connection_obj.user_homepage().others] = connection_obj.user_homepage().others_object;

}