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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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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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"""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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def __init__(self, httpcode, message=None):
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self.httpcode = httpcode
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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 make_local_path(path):
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"""Given a path relative to the IVLE root, on the local file system, makes
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the path relative to the root using ivle.conf.share_path. This path can
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be used in reading files from the local file system."""
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return os.path.join(ivle.conf.share_path, 'www', 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 open_exercise_file(exercisename):
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"""Given an exercise name, opens the corresponding XML file for reading.
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Returns None if the exercise file was not found.
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(For tutorials / worksheets).
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# First normalise the path
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exercisename = os.path.normpath(exercisename)
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# Now if it begins with ".." or separator, then it's illegal
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if exercisename.startswith("..") or exercisename.startswith(os.sep):
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exercisefile = os.path.join(ivle.conf.exercises_base, exercisename)
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return open(exercisefile)
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except (TypeError, IOError): # TypeError if exercisefile == None
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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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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 get_terms_of_service():
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Sends the Terms of Service document to the req object.
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This consults conf to find out where the TOS is located on disk, and sends
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that. If it isn't found, it sends a generic message explaining to admins
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how to create a real one.
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return open(ivle.conf.tos_path).read()
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<p><b>*** SAMPLE ONLY ***</b></p>
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<p>This is the text of the IVLE Terms of Service.</p>
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<p>The administrator should create a license file with an appropriate
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"Terms of Service" license for your organisation.</p>
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<h2>Instructions for Administrators</h2>
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<p>You are seeing this message because you have not configured a Terms of
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Service document.</p>
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<p>When you configured IVLE, you specified a path to the Terms of Service
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document (this is found in <b><tt>ivle/conf/conf.py</tt></b> under
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"<tt>tos_path</tt>").</p>
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<p>Create a file at this location; an HTML file with the appropriately-worded
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<p>This should be a normal XHTML file, except it should not contain
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<tt>html</tt>, <tt>head</tt> or <tt>body</tt> elements - it should
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just be the contents of a body element (IVLE will wrap it accordingly).</p>
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<p>This will automatically be used as the license text instead of this
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placeholder text.</p>
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def parse_iso8601(str):
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"""Parses ISO8601 string into a datetime object."""
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# FIXME: Terrific hack that means we only accept the format that is
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# produced by json.js module when it encodes date objects.
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return datetime.datetime.strptime(str, "%Y-%m-%dT%H:%M:%SZ")
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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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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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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 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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"""Convert an object into a dictionary.
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This takes a shallow copy of the object.
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@param attrnames: Set (or iterable) of names of attributes to be copied
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into the dictionary. (We don't auto-lookup, because this
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function needs to be 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('_'))
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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())
added
removed
ivle/util.py
