22
22
# Contains common utility functions.
23
# Also initialises mime types library. You must import util before using
24
# Python's builtin mimetypes module to make sure local settings are applied.
31
import ivle.conf.mimetypes
28
33
class IVLEError(Exception):
29
"""Legacy general IVLE exception.
31
This is the old "standard" exception class for IVLE errors. It is only
32
used in fileservice, and should not be used in any new code.
35
This is the "standard" exception class for IVLE errors.
36
It is the ONLY exception which should propagate to the top - it will then
37
be displayed to the user as an HTTP error with the given code.
39
All other exceptions are considered IVLE bugs and should not occur
40
(they will display a traceback).
42
This error should not be raised directly. Call req.throw_error.
37
44
def __init__(self, httpcode, message=None):
38
45
self.httpcode = httpcode
39
46
self.message = message
40
47
self.args = (httpcode, message)
42
49
class IVLEJailError(Exception):
43
"""Exception proxying an in-jail error.
45
51
This exception indicates an error that occurred inside an IVLE CGI script
46
52
inside the jail. It should never be raised directly - only by the
64
70
def __repr__(self):
65
71
return "<Fake %s %s>"%(self.type, self.name)
75
"""Given a path relative to the IVLE root, makes the path relative to the
76
site root using ivle.conf.root_dir. This path can be used in URLs sent to
78
return os.path.join(ivle.conf.root_dir, path)
80
def make_local_path(path):
81
"""Given a path relative to the IVLE root, on the local file system, makes
82
the path relative to the root using ivle.conf.share_path. This path can
83
be used in reading files from the local file system."""
84
return os.path.join(ivle.conf.share_path, 'www', path)
86
def unmake_path(path):
87
"""Given a path relative to the site root, makes the path relative to the
88
IVLE root by removing ivle.conf.root_dir if it appears at the beginning. If
89
it does not appear at the beginning, returns path unchanged. Also
90
normalises the path."""
91
path = os.path.normpath(path)
92
root = os.path.normpath(ivle.conf.root_dir)
94
if path.startswith(root):
95
path = path[len(root):]
96
# Take out the slash as well
97
if len(path) > 0 and path[0] == os.sep:
67
102
def split_path(path):
68
103
"""Given a path, returns a tuple consisting of the top-level directory in
69
104
the path, and the rest of the path. Note that both items in the tuple will
100
135
return tuple(splitpath)
102
def relpath(path, start=os.path.curdir):
103
"""Return a relative version of a path.
104
XXX Backported from Python 2.6 posixpath.py.
108
raise ValueError("no path specified")
110
start_list = os.path.abspath(start).split(os.path.sep)
111
path_list = os.path.abspath(path).split(os.path.sep)
113
# Work out how much of the filepath is shared by start and path.
114
i = len(os.path.commonprefix([start_list, path_list]))
116
rel_list = [os.path.pardir] * (len(start_list)-i) + path_list[i:]
118
return os.path.curdir
119
return os.path.join(*rel_list)
137
def open_exercise_file(exercisename):
138
"""Given an exercise name, opens the corresponding XML file for reading.
139
Returns None if the exercise file was not found.
140
(For tutorials / worksheets).
142
# First normalise the path
143
exercisename = os.path.normpath(exercisename)
144
# Now if it begins with ".." or separator, then it's illegal
145
if exercisename.startswith("..") or exercisename.startswith(os.sep):
148
exercisefile = os.path.join(ivle.conf.exercises_base, exercisename)
151
return open(exercisefile)
152
except (TypeError, IOError): # TypeError if exercisefile == None
155
# Initialise mime types library
157
for (ext, mimetype) in ivle.conf.mimetypes.additional_mime_types.items():
158
mimetypes.add_type(mimetype, ext)
160
def nice_filetype(filename):
161
"""Given a filename or basename, returns a "friendly" name for that
163
eg. nice_mimetype("file.py") == "Python source code".
164
nice_filetype("file.bzg") == "BZG file".
165
nice_filetype("directory/") == "Directory".
167
if filename[-1] == os.sep:
171
return ivle.conf.mimetypes.nice_mimetypes[
172
mimetypes.guess_type(filename)[0]]
174
filename = os.path.basename(filename)
176
return filename[filename.rindex('.')+1:].upper() + " file"
180
def get_terms_of_service():
182
Sends the Terms of Service document to the req object.
183
This consults conf to find out where the TOS is located on disk, and sends
184
that. If it isn't found, it sends a generic message explaining to admins
185
how to create a real one.
188
return open(ivle.conf.tos_path).read()
190
return """<h1>Terms of Service</h1>
191
<p><b>*** SAMPLE ONLY ***</b></p>
192
<p>This is the text of the IVLE Terms of Service.</p>
193
<p>The administrator should create a license file with an appropriate
194
"Terms of Service" license for your organisation.</p>
195
<h2>Instructions for Administrators</h2>
196
<p>You are seeing this message because you have not configured a Terms of
197
Service document.</p>
198
<p>When you configured IVLE, you specified a path to the Terms of Service
199
document (this is found in <b><tt>ivle/conf/conf.py</tt></b> under
200
"<tt>tos_path</tt>").</p>
201
<p>Create a file at this location; an HTML file with the appropriately-worded
203
<p>This should be a normal XHTML file, except it should not contain
204
<tt>html</tt>, <tt>head</tt> or <tt>body</tt> elements - it should
205
just be the contents of a body element (IVLE will wrap it accordingly).</p>
206
<p>This will automatically be used as the license text instead of this
207
placeholder text.</p>
210
def parse_iso8601(str):
211
"""Parses ISO8601 string into a datetime object."""
212
# FIXME: Terrific hack that means we only accept the format that is
213
# produced by json.js module when it encodes date objects.
214
return datetime.datetime.strptime(str, "%Y-%m-%dT%H:%M:%SZ")
121
216
def incomplete_utf8_sequence(byteseq):
122
"""Calculate the completeness of a UTF-8 encoded string.
124
219
Given a UTF-8-encoded byte sequence (str), returns the number of bytes at
125
220
the end of the string which comprise an incomplete UTF-8 character
200
def safe_rmtree(path, ignore_errors=False, onerror=None):
201
"""Recursively delete a directory tree.
203
Copied from shutil.rmtree from Python 2.6, which does not follow symbolic
204
links (it is otherwise unsafe to call as root on untrusted directories; do
205
not use shutil.rmtree in this case, as you may be running Python 2.5).
207
If ignore_errors is set, errors are ignored; otherwise, if onerror
208
is set, it is called to handle the error with arguments (func,
209
path, exc_info) where func is os.listdir, os.remove, or os.rmdir;
210
path is the argument to that function that caused it to fail; and
211
exc_info is a tuple returned by sys.exc_info(). If ignore_errors
212
is false and onerror is None, an exception is raised.
218
elif onerror is None:
222
if os.path.islink(path):
223
# symlinks to directories are forbidden, see bug #1669
224
raise OSError("Cannot call safe_rmtree on a symbolic link")
226
onerror(os.path.islink, path, sys.exc_info())
227
# can't continue even if onerror hook returns
231
names = os.listdir(path)
232
except os.error, err:
233
onerror(os.listdir, path, sys.exc_info())
235
fullname = os.path.join(path, name)
237
mode = os.lstat(fullname).st_mode
240
if stat.S_ISDIR(mode):
241
safe_rmtree(fullname, ignore_errors, onerror)
245
except os.error, err:
246
onerror(os.remove, fullname, sys.exc_info())
250
onerror(os.rmdir, path, sys.exc_info())
252
def format_submission_principal(user, principal):
253
"""Render a list of users to fit in the offering project listing.
255
Given a user and a list of submitters, returns 'solo' if the
256
only submitter is the user, or a string of the form
257
'with A, B and C' if there are any other submitters.
259
If submitters is None, we assume that the list of members could
260
not be determined, so we just return 'group'.
262
if principal is None:
265
if principal is user:
268
display_names = sorted(
269
member.display_name for member in principal.members
270
if member is not user)
272
if len(display_names) == 0:
273
return 'solo (%s)' % principal.name
274
elif len(display_names) == 1:
275
return 'with %s (%s)' % (display_names[0], principal.name)
276
elif len(display_names) > 5:
277
return 'with %d others (%s)' % (len(display_names), principal.name)
279
return 'with %s and %s (%s)' % (', '.join(display_names[:-1]),
280
display_names[-1], principal.name)
295
def object_to_dict(attrnames, obj):
297
Convert an object into a dictionary. This takes a shallow copy of the
299
attrnames: Set (or iterable) of names of attributes to be copied into the
300
dictionary. (We don't auto-lookup, because this function needs to be
301
used on magical objects).
303
return dict((k, getattr(obj, k))
304
for k in attrnames if not k.startswith('_'))
added
removed
ivle/util.py
