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# Contains common utility functions.
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# Also initialises mime types library. You must import util before using
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# Python's builtin mimetypes module to make sure local settings are applied.
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import ivle.conf.mimetypes
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class IVLEError(Exception):
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"""Legacy general IVLE exception.
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This is the old "standard" exception class for IVLE errors. It is only
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used in fileservice, and should not be used in any new code.
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This is the "standard" exception class for IVLE errors.
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It is the ONLY exception which should propagate to the top - it will then
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be displayed to the user as an HTTP error with the given code.
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All other exceptions are considered IVLE bugs and should not occur
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(they will display a traceback).
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This error should not be raised directly. Call req.throw_error.
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def __init__(self, httpcode, message=None):
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self.httpcode = httpcode
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self.message = message
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self.args = (httpcode, message)
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class IVLEJailError(Exception):
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"""Exception proxying an in-jail error.
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This exception indicates an error that occurred inside an IVLE CGI script
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inside the jail. It should never be raised directly - only by the
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def __repr__(self):
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return "<Fake %s %s>"%(self.type, self.name)
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"""Given a path relative to the IVLE root, makes the path relative to the
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site root using ivle.conf.root_dir. This path can be used in URLs sent to
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return os.path.join(ivle.conf.root_dir, path)
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def unmake_path(path):
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"""Given a path relative to the site root, makes the path relative to the
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IVLE root by removing ivle.conf.root_dir if it appears at the beginning. If
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it does not appear at the beginning, returns path unchanged. Also
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normalises the path."""
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path = os.path.normpath(path)
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root = os.path.normpath(ivle.conf.root_dir)
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if path.startswith(root):
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path = path[len(root):]
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# Take out the slash as well
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if len(path) > 0 and path[0] == os.sep:
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def split_path(path):
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"""Given a path, returns a tuple consisting of the top-level directory in
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the path, and the rest of the path. Note that both items in the tuple will
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return tuple(splitpath)
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def relpath(path, start=os.path.curdir):
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"""Return a relative version of a path.
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XXX Backported from Python 2.6 posixpath.py.
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# Initialise mime types library
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for (ext, mimetype) in ivle.conf.mimetypes.additional_mime_types.items():
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mimetypes.add_type(mimetype, ext)
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def nice_filetype(filename):
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"""Given a filename or basename, returns a "friendly" name for that
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eg. nice_mimetype("file.py") == "Python source code".
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nice_filetype("file.bzg") == "BZG file".
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nice_filetype("directory/") == "Directory".
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raise ValueError("no path specified")
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start_list = os.path.abspath(start).split(os.path.sep)
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path_list = os.path.abspath(path).split(os.path.sep)
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# Work out how much of the filepath is shared by start and path.
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i = len(os.path.commonprefix([start_list, path_list]))
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rel_list = [os.path.pardir] * (len(start_list)-i) + path_list[i:]
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return os.path.curdir
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return os.path.join(*rel_list)
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if filename[-1] == os.sep:
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return ivle.conf.mimetypes.nice_mimetypes[
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mimetypes.guess_type(filename)[0]]
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filename = os.path.basename(filename)
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return filename[filename.rindex('.')+1:].upper() + " file"
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def incomplete_utf8_sequence(byteseq):
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"""Calculate the completeness of a UTF-8 encoded string.
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Given a UTF-8-encoded byte sequence (str), returns the number of bytes at
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the end of the string which comprise an incomplete UTF-8 character
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def safe_rmtree(path, ignore_errors=False, onerror=None):
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"""Recursively delete a directory tree.
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Copied from shutil.rmtree from Python 2.6, which does not follow symbolic
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links (it is otherwise unsafe to call as root on untrusted directories; do
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not use shutil.rmtree in this case, as you may be running Python 2.5).
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If ignore_errors is set, errors are ignored; otherwise, if onerror
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is set, it is called to handle the error with arguments (func,
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path, exc_info) where func is os.listdir, os.remove, or os.rmdir;
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path is the argument to that function that caused it to fail; and
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exc_info is a tuple returned by sys.exc_info(). If ignore_errors
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is false and onerror is None, an exception is raised.
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elif onerror is None:
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if os.path.islink(path):
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# symlinks to directories are forbidden, see bug #1669
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raise OSError("Cannot call safe_rmtree on a symbolic link")
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onerror(os.path.islink, path, sys.exc_info())
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# can't continue even if onerror hook returns
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names = os.listdir(path)
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except os.error, err:
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onerror(os.listdir, path, sys.exc_info())
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fullname = os.path.join(path, name)
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mode = os.lstat(fullname).st_mode
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if stat.S_ISDIR(mode):
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safe_rmtree(fullname, ignore_errors, onerror)
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except os.error, err:
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onerror(os.remove, fullname, sys.exc_info())
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onerror(os.rmdir, path, sys.exc_info())
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def format_submission_principal(user, principal):
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"""Render a list of users to fit in the offering project listing.
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Given a user and a list of submitters, returns 'solo' if the
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only submitter is the user, or a string of the form
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'with A, B and C' if there are any other submitters.
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If submitters is None, we assume that the list of members could
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not be determined, so we just return 'group'.
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if principal is None:
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if principal is user:
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display_names = sorted(
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member.display_name for member in principal.members
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if member is not user)
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if len(display_names) == 0:
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return 'solo (%s)' % principal.name
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elif len(display_names) == 1:
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return 'with %s (%s)' % (display_names[0], principal.name)
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elif len(display_names) > 5:
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return 'with %d others (%s)' % (len(display_names), principal.name)
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return 'with %s and %s (%s)' % (', '.join(display_names[:-1]),
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display_names[-1], principal.name)
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def object_to_dict(attrnames, obj):
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Convert an object into a dictionary. This takes a shallow copy of the
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attrnames: Set (or iterable) of names of attributes to be copied into the
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dictionary. (We don't auto-lookup, because this function needs to be
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used on magical objects).
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return dict((k, getattr(obj, k))
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for k in attrnames if not k.startswith('_'))
added
removed
ivle/util.py
