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# Copyright (C) 2007-2008 The University of Melbourne
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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# Module: File Service / Action
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# Handles actions requested by the client as part of the 2-stage process of
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# fileservice (the second part being the return listing).
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# The most important argument is "action". This determines which action is
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# taken. Note that action, and all other arguments, are ignored unless the
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# request is a POST request. The other arguments depend upon the action.
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# Note that paths are often specified as arguments. Paths that begin with a
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# slash are taken relative to the user's home directory (the top-level
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# directory seen when fileservice has no arguments or path). Paths without a
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# slash are taken relative to the specified path.
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# action=remove: Delete a file(s) or directory(s) (recursively).
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# path: The path to the file or directory to delete. Can be specified
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# action=move: Move or rename a file or directory.
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# from: The path to the file or directory to be renamed.
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# to: The path of the target filename. Error if the file already
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# action=putfile: Upload a file to the student workspace.
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# path: The path to the file to be written. Error if the target
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# file is a directory.
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# data: Bytes to be written to the file verbatim. May either be
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# a string variable or a file upload.
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# overwrite: Optional. If supplied, the file will be overwritten.
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# Otherwise, error if path already exists.
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# action=putfiles: Upload multiple files to the student workspace, and
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# optionally accept zip files which will be unpacked.
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# path: The path to the DIRECTORY to place files in. Must not be a
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# data: A file upload (may not be a simple string). The filename
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# will be used to determine the target filename within
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# unpack: Optional. If supplied, if any data is a valid ZIP file,
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# will create a directory instead and unpack the ZIP file
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# action=mkdir: Create a directory. The parent dir must exist.
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# path: The path to a file which does not exist, but whose parent
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# does. The dir will be made with this name.
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# The differences between putfile and putfiles are:
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# * putfile can only accept a single file, and can't unpack zipfiles.
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# * putfile can accept string data, doesn't have to be a file upload.
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# * putfile ignores the upload filename, the entire filename is specified on
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# path. putfiles calls files after the name on the user's machine.
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# action=paste: Copy or move the files to a specified dir.
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# src: The path to the DIRECTORY to get the files from (relative).
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# dst: The path to the DIRECTORY to paste the files to. Must not
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# mode: 'copy' or 'move'
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# file: File to be copied or moved, relative to src, to a destination
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# relative to dst. Can be specified multiple times.
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# action=svnadd: Add an existing file(s) to version control.
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# path: The path to the file to be added. Can be specified multiple
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# action=svnrevert: Revert a file(s) to its state as of the current revision
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# path: The path to the file to be reverted. Can be specified multiple
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# action=svnupdate: Bring a file up to date with the head revision.
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# path: The path to the file to be updated. Only one file may be
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# action=svnpublish: Set the "published" flag on a file to True.
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# path: The path to the file to be published. Can be specified
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# action=svnunpublish: Set the "published" flag on a file to False.
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# path: The path to the file to be unpublished. Can be specified
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# action=svncommit: Commit a file(s) or directory(s) to the repository.
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# path: The path to the file or directory to be committed. Can be
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# specified multiple times. Directories are committed
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# logmsg: Text of the log message. Optional. There is a default log
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# message if unspecified.
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# action=svncheckout: Checkout a file/directory from the repository.
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# path: The [repository] path to the file or directory to be
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# TODO: Implement the following actions:
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# TODO: Implement ZIP unpacking in putfiles (done?).
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# TODO: svnupdate needs a digest to tell the user the files that were updated.
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# This can be implemented by some message passing between action and
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# listing, and having the digest included in the listing. (Problem if
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# the listing is not a directory, but we could make it an error to do an
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# update if the path is not a directory).
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from common import (util, studpath, zip)
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def get_login(_realm, existing_login, _may_save):
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"""Callback function used by pysvn for authentication.
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realm, existing_login, _may_save: The 3 arguments passed by pysvn to
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The following has been determined empirically, not from docs:
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existing_login will be the name of the user who owns the process on
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the first attempt, "" on subsequent attempts. We use this fact.
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# Only provide credentials on the _first_ attempt.
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# If we're being asked again, then it means the credentials failed for
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# some reason and we should just fail. (This is not desirable, but it's
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# better than being asked an infinite number of times).
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return (existing_login != "", conf.login, conf.svn_pass, True)
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# Make a Subversion client object
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svnclient = pysvn.Client()
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svnclient.callback_get_login = get_login
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svnclient.exception_style = 0 # Simple (string) exceptions
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DEFAULT_LOGMESSAGE = "No log message supplied."
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# application/json is the "best" content type but is not good for
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# debugging because Firefox just tries to download it
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mime_dirlisting = "text/html"
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#mime_dirlisting = "application/json"
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class ActionError(Exception):
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"""Represents an error processing an action. This can be
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raised by any of the action functions, and will be caught
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by the top-level handler, put into the HTTP response field,
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Important Security Consideration: The message passed to this
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exception will be relayed to the client.
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def handle_action(req, action, fields):
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"""Perform the "action" part of the response.
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This function should only be called if the response is a POST.
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This performs the action's side-effect on the server. If unsuccessful,
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writes the X-IVLE-Action-Error header to the request object. Otherwise,
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does not touch the request object. Does NOT write any bytes in response.
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May throw an ActionError. The caller should put this string into the
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X-IVLE-Action-Error header, and then continue normally.
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action: String, the action requested. Not sanitised.
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fields: FieldStorage object containing all arguments passed.
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global actions_table # Table of function objects
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action = actions_table[action]
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# Default, just send an error but then continue
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raise ActionError("Unknown action")
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def actionpath_to_urlpath(req, path):
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"""Determines the URL path (relative to the student home) upon which the
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action is intended to act. See actionpath_to_local.
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elif len(path) > 0 and path[0] == os.sep:
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# Relative to student home
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# Relative to req.path
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return os.path.join(req.path, path)
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def actionpath_to_local(req, path):
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"""Determines the local path upon which an action is intended to act.
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Note that fileservice actions accept two paths: the request path,
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and the "path" argument given to the action.
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According to the rules, if the "path" argument begins with a '/' it is
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relative to the user's home; if it does not, it is relative to the
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This resolves the path, given the request and path argument.
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May raise an ActionError("Invalid path"). The caller is expected to
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let this fall through to the top-level handler, where it will be
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put into the HTTP response field. Never returns None.
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(_, _, r) = studpath.url_to_jailpaths(actionpath_to_urlpath(req, path))
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raise ActionError("Invalid path")
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def movefile(req, frompath, topath, copy=False):
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"""Performs a file move, resolving filenames, checking for any errors,
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and throwing ActionErrors if necessary. Can also be used to do a copy
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frompath and topath are straight paths from the client. Will be checked.
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# TODO: Do an SVN mv if the file is versioned.
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# TODO: Disallow tampering with student's home directory
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if frompath is None or topath is None:
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raise ActionError("Required field missing")
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frompath = actionpath_to_local(req, frompath)
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topath = actionpath_to_local(req, topath)
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if not os.path.exists(frompath):
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raise ActionError("The source file does not exist")
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if os.path.exists(topath):
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if frompath == topath:
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raise ActionError("Source and destination are the same")
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raise ActionError("A file already exists with that name")
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if os.path.isdir(frompath):
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shutil.copytree(frompath, topath)
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shutil.copy2(frompath, topath)
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shutil.move(frompath, topath)
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raise ActionError("Could not move the file specified")
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raise ActionError("Could not move the file specified")
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def action_remove(req, fields):
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# TODO: Do an SVN rm if the file is versioned.
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# TODO: Disallow removal of student's home directory
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"""Removes a list of files or directories.
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Reads fields: 'path' (multiple)
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paths = fields.getlist('path')
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path = actionpath_to_local(req, path)
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if os.path.isdir(path):
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raise ActionError("Could not delete the file specified")
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"Could not delete one or more of the files specified")
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def action_move(req, fields):
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# TODO: Do an SVN mv if the file is versioned.
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# TODO: Disallow tampering with student's home directory
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"""Removes a list of files or directories.
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Reads fields: 'from', 'to'
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frompath = fields.getfirst('from')
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topath = fields.getfirst('to')
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movefile(req, frompath, topath)
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def action_mkdir(req, fields):
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"""Creates a directory with the given path.
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path = fields.getfirst('path')
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raise ActionError("Required field missing")
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path = actionpath_to_local(req, path)
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if os.path.exists(path):
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raise ActionError("A file already exists with that name")
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# Create the directory
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raise ActionError("Could not create directory")
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def action_putfile(req, fields):
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"""Writes data to a file, overwriting it if it exists and creating it if
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Reads fields: 'path', 'data' (file upload), 'overwrite'
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# TODO: Read field "unpack".
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# Important: Data is "None" if the file submitted is empty.
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path = fields.getfirst('path')
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data = fields.getfirst('data')
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raise ActionError("Required field missing")
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# Workaround - field reader treats "" as None, so this is the only
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# way to allow blank file uploads
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path = actionpath_to_local(req, path)
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data = cStringIO.StringIO(data)
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overwrite = fields.getfirst('overwrite')
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if overwrite is None:
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# Overwrite files; but can't if it's a directory
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if os.path.isdir(path):
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raise ActionError("A directory already exists "
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if os.path.exists(path):
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raise ActionError("A file already exists with that name")
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# Copy the contents of file object 'data' to the path 'path'
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dest = open(path, 'wb')
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shutil.copyfileobj(data, dest)
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except (IOError, OSError), e:
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raise ActionError("Could not write to target file: %s" % e.strerror)
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def action_putfiles(req, fields):
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"""Writes data to one or more files in a directory, overwriting them if
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Reads fields: 'path', 'data' (file upload, multiple), 'unpack'
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# Important: Data is "None" if the file submitted is empty.
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path = fields.getfirst('path')
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data = fields['data']
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if type(data) != type([]):
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unpack = fields.getfirst('unpack')
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raise ActionError("Required field missing")
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path = actionpath_to_urlpath(req, path)
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# Each of the uploaded files
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filepath = os.path.join(path, datum.filename)
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filedata = datum.file
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if unpack and datum.filename.lower().endswith(".zip"):
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# A zip file - unpack it instead of just copying
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# TODO: Use the magic number instead of file extension
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# Note: Just unzip into the current directory (ignore the
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# First get the entire path (within jail)
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_, _, abspath = studpath.url_to_jailpaths(path)
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abspath = os.path.join(os.sep, abspath)
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zip.unzip(abspath, filedata)
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except (OSError, IOError):
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(_, _, filepath_local) = studpath.url_to_jailpaths(filepath)
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if filepath_local is None:
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raise ActionError("Invalid path")
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# Copy the contents of file object 'data' to the path 'path'
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dest = open(filepath_local, 'wb')
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shutil.copyfileobj(filedata, dest)
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raise ActionError("Could not write to target file")
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"Could not write to one or more of the target files")
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def action_paste(req, fields):
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"""Performs the copy or move action with the files specified.
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Copies/moves the files to the specified directory.
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Reads fields: 'src', 'dst', 'mode', 'file' (multiple).
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src: Base path that all the files are relative to (source).
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dst: Destination path to paste into.
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mode: 'copy' or 'move'.
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file: (Multiple) Files relative to base, which will be copied
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or moved to new locations relative to path.
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dst = fields.getfirst('dst')
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src = fields.getfirst('src')
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mode = fields.getfirst('mode')
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files = fields.getlist('file')
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if dst is None or src is None or mode is None:
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raise ActionError("Required field missing")
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raise ActionError("Invalid mode (must be 'copy' or 'move')")
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dst_local = actionpath_to_local(req, dst)
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if not os.path.isdir(dst_local):
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raise ActionError("dst is not a directory")
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# The source must not be interpreted as relative to req.path
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# Add a slash (relative to top-level)
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frompath = os.path.join(src, file)
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# The destination is found by taking just the basename of the file
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topath = os.path.join(dst, os.path.basename(file))
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movefile(req, frompath, topath, copy)
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except ActionError, message:
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# Store the error for later; we want to copy as many as possible
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# Multiple errors; generic message
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errormsg = "One or more files could not be pasted"
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# Add this file to errorfiles; it will be put back on the
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# clipboard for possible future pasting.
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errorfiles.append(file)
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if errormsg is not None:
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raise ActionError(errormsg)
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# XXX errorfiles contains a list of files that couldn't be pasted.
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# we currently do nothing with this.
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def action_publish(req,fields):
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"""Marks the folder as published by adding a '.published' file to the
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directory and ensuring that the parent directory permissions are correct
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paths = fields.getlist('path')
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user = studpath.url_to_local(req.path)[0]
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homedir = "/home/%s" % user
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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paths = [studpath.url_to_jailpaths(req.path)[2]]
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# Set all the dirs in home dir world browsable (o+r,o+x)
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#FIXME: Should really only do those in the direct path not all of the
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# folders in a students home directory
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for root,dirs,files in os.walk(homedir):
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os.chmod(root, os.stat(root).st_mode|0005)
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if os.path.isdir(path):
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pubfile = open(os.path.join(path,'.published'),'w')
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pubfile.write("This directory is published\n")
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raise ActionError("Can only publish directories")
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raise ActionError("Directory could not be published")
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def action_unpublish(req,fields):
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"""Marks the folder as unpublished by removing a '.published' file in the
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directory (if it exits). It does not change the permissions of the parent
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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paths = [studpath.url_to_jailpaths(req.path)[2]]
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if os.path.isdir(path):
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pubfile = os.path.join(path,'.published')
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if os.path.isfile(pubfile):
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raise ActionError("Can only unpublish directories")
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raise ActionError("Directory could not be unpublished")
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def action_svnadd(req, fields):
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"""Performs a "svn add" to each file specified.
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Reads fields: 'path' (multiple)
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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svnclient.add(paths, recurse=True, force=True)
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except pysvn.ClientError, e:
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raise ActionError(str(e))
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def action_svnupdate(req, fields):
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"""Performs a "svn update" to each file specified.
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path = fields.getfirst('path')
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raise ActionError("Required field missing")
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path = actionpath_to_local(req, path)
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svnclient.update(path, recurse=True)
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except pysvn.ClientError, e:
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raise ActionError(str(e))
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def action_svnrevert(req, fields):
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"""Performs a "svn revert" to each file specified.
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Reads fields: 'path' (multiple)
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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svnclient.revert(paths, recurse=True)
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except pysvn.ClientError, e:
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raise ActionError(str(e))
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def action_svnpublish(req, fields):
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"""Sets svn property "ivle:published" on each file specified.
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Should only be called on directories (only effective on directories
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XXX Currently unused by the client (calls action_publish instead, which
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has a completely different publishing model).
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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paths = [studpath.url_to_jailpaths(req.path)[2]]
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# Note: Property value doesn't matter
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svnclient.propset("ivle:published", "", path, recurse=False)
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except pysvn.ClientError, e:
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raise ActionError("Directory could not be published")
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def action_svnunpublish(req, fields):
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"""Deletes svn property "ivle:published" on each file specified.
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XXX Currently unused by the client (calls action_unpublish instead, which
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has a completely different publishing model).
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, path), paths)
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svnclient.propdel("ivle:published", path, recurse=False)
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except pysvn.ClientError, e:
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raise ActionError("Directory could not be unpublished")
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def action_svncommit(req, fields):
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"""Performs a "svn commit" to each file specified.
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Reads fields: 'path' (multiple), 'logmsg' (optional)
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paths = fields.getlist('path')
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paths = map(lambda path: actionpath_to_local(req, str(path)), paths)
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logmsg = str(fields.getfirst('logmsg', DEFAULT_LOGMESSAGE))
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if logmsg == '': logmsg = DEFAULT_LOGMESSAGE
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svnclient.checkin(paths, logmsg, recurse=True)
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except pysvn.ClientError, e:
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raise ActionError(str(e))
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def action_svncheckout(req, fields):
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"""Performs a "svn checkout" of each path specified.
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Reads fields: 'path' (multiple)
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paths = fields.getlist('path')
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raise ActionError("usage: svncheckout url local-path")
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url = conf.svn_addr + "/" + login + "/" + paths[0]
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local_path = actionpath_to_local(req, str(paths[1]))
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svnclient.callback_get_login = get_login
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svnclient.checkout(url, local_path, recurse=True)
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except pysvn.ClientError, e:
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raise ActionError(str(e))
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# Table of all action functions #
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# Each function has the interface f(req, fields).
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"remove" : action_remove,
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"move" : action_move,
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"mkdir" : action_mkdir,
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"putfile" : action_putfile,
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"putfiles" : action_putfiles,
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"paste" : action_paste,
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"publish" : action_publish,
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"unpublish" : action_unpublish,
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"svnadd" : action_svnadd,
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"svnupdate" : action_svnupdate,
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"svnrevert" : action_svnrevert,
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"svnpublish" : action_svnpublish,
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"svnunpublish" : action_svnunpublish,
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"svncommit" : action_svncommit,
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"svncheckout" : action_svncheckout,
added
removed
lib/fileservice_lib/action.py
