Mercurial > hg
view mercurial/hgweb/common.py @ 50757:19108906abaf stable
extensions: imp module is removed in Python 3.12 - use importlib to load files
imp has been deprecated for a long time, and has finally been removed in Python
3.12 .
imp was only used for loading extensions that has been specified with direct
.py path or path to a package directory. The same use cases can be achieved
quite simple with importlib, , possiby with small changes in corner cases with
undefined behaviour, such as extensions without .py source.
There might also be corner cases and undefined behaviour around use of
sys.modules and reloading.
author | Mads Kiilerich <mads@kiilerich.com> |
---|---|
date | Wed, 28 Jun 2023 14:23:13 +0200 |
parents | 4bddc2f72879 |
children | 18c8c18993f0 |
line wrap: on
line source
# hgweb/common.py - Utility functions needed by hgweb_mod and hgwebdir_mod # # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> # Copyright 2005, 2006 Olivia Mackall <olivia@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import base64 import errno import mimetypes import os import stat from ..i18n import _ from ..pycompat import ( getattr, open, ) from .. import ( encoding, pycompat, scmutil, templater, util, ) httpserver = util.httpserver HTTP_OK = 200 HTTP_CREATED = 201 HTTP_NOT_MODIFIED = 304 HTTP_BAD_REQUEST = 400 HTTP_UNAUTHORIZED = 401 HTTP_FORBIDDEN = 403 HTTP_NOT_FOUND = 404 HTTP_METHOD_NOT_ALLOWED = 405 HTTP_NOT_ACCEPTABLE = 406 HTTP_UNSUPPORTED_MEDIA_TYPE = 415 HTTP_SERVER_ERROR = 500 ismember = scmutil.ismember def hashiddenaccess(repo, req): if bool(req.qsparams.get(b'access-hidden')): # Disable this by default for now. Main risk is to get critical # information exposed through this. This is expecially risky if # someone decided to make a changeset secret for good reason, but # its predecessors are still draft. # # The feature is currently experimental, so we can still decide to # change the default. ui = repo.ui allow = ui.configlist(b'experimental', b'server.allow-hidden-access') user = req.remoteuser if allow and ismember(ui, user, allow): return True else: msg = ( _( b'ignoring request to access hidden changeset by ' b'unauthorized user: %r\n' ) % user ) ui.warn(msg) return False def checkauthz(hgweb, req, op): """Check permission for operation based on request data (including authentication info). Return if op allowed, else raise an ErrorResponse exception.""" user = req.remoteuser deny_read = hgweb.configlist(b'web', b'deny_read') if deny_read and (not user or ismember(hgweb.repo.ui, user, deny_read)): raise ErrorResponse(HTTP_UNAUTHORIZED, b'read not authorized') allow_read = hgweb.configlist(b'web', b'allow_read') if allow_read and (not ismember(hgweb.repo.ui, user, allow_read)): raise ErrorResponse(HTTP_UNAUTHORIZED, b'read not authorized') if op == b'pull' and not hgweb.allowpull: raise ErrorResponse(HTTP_UNAUTHORIZED, b'pull not authorized') elif op == b'pull' or op is None: # op is None for interface requests return # Allow LFS uploading via PUT requests if op == b'upload': if req.method != b'PUT': msg = b'upload requires PUT request' raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg) # enforce that you can only push using POST requests elif req.method != b'POST': msg = b'push requires POST request' raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg) # require ssl by default for pushing, auth info cannot be sniffed # and replayed if hgweb.configbool(b'web', b'push_ssl') and req.urlscheme != b'https': raise ErrorResponse(HTTP_FORBIDDEN, b'ssl required') deny = hgweb.configlist(b'web', b'deny_push') if deny and (not user or ismember(hgweb.repo.ui, user, deny)): raise ErrorResponse(HTTP_UNAUTHORIZED, b'push not authorized') allow = hgweb.configlist(b'web', b'allow-push') if not (allow and ismember(hgweb.repo.ui, user, allow)): raise ErrorResponse(HTTP_UNAUTHORIZED, b'push not authorized') # Hooks for hgweb permission checks; extensions can add hooks here. # Each hook is invoked like this: hook(hgweb, request, operation), # where operation is either read, pull, push or upload. Hooks should either # raise an ErrorResponse exception, or just return. # # It is possible to do both authentication and authorization through # this. permhooks = [checkauthz] class ErrorResponse(Exception): def __init__(self, code, message=None, headers=None): if message is None: message = _statusmessage(code) Exception.__init__(self, pycompat.sysstr(message)) self.code = code if headers is None: headers = [] self.headers = headers self.message = message class continuereader: """File object wrapper to handle HTTP 100-continue. This is used by servers so they automatically handle Expect: 100-continue request headers. On first read of the request body, the 100 Continue response is sent. This should trigger the client into actually sending the request body. """ def __init__(self, f, write): self.f = f self._write = write self.continued = False def read(self, amt=-1): if not self.continued: self.continued = True self._write(b'HTTP/1.1 100 Continue\r\n\r\n') return self.f.read(amt) def __getattr__(self, attr): if attr in (b'close', b'readline', b'readlines', b'__iter__'): return getattr(self.f, attr) raise AttributeError def _statusmessage(code): responses = httpserver.basehttprequesthandler.responses return pycompat.bytesurl(responses.get(code, ('Error', 'Unknown error'))[0]) def statusmessage(code, message=None): return b'%d %s' % (code, message or _statusmessage(code)) def get_stat(spath, fn): """stat fn if it exists, spath otherwise""" cl_path = os.path.join(spath, fn) if os.path.exists(cl_path): return os.stat(cl_path) else: return os.stat(spath) def get_mtime(spath): return get_stat(spath, b"00changelog.i")[stat.ST_MTIME] def ispathsafe(path): """Determine if a path is safe to use for filesystem access.""" parts = path.split(b'/') for part in parts: if ( part in (b'', pycompat.oscurdir, pycompat.ospardir) or pycompat.ossep in part or pycompat.osaltsep is not None and pycompat.osaltsep in part ): return False return True def staticfile(templatepath, directory, fname, res): """return a file inside directory with guessed Content-Type header fname always uses '/' as directory separator and isn't allowed to contain unusual path components. Content-Type is guessed using the mimetypes module. Return an empty string if fname is illegal or file not found. """ if not ispathsafe(fname): return if not directory: tp = templatepath or templater.templatedir() if tp is not None: directory = os.path.join(tp, b'static') fpath = os.path.join(*fname.split(b'/')) ct = pycompat.sysbytes( mimetypes.guess_type(pycompat.fsdecode(fpath))[0] or r"text/plain" ) path = os.path.join(directory, fpath) try: os.stat(path) with open(path, b'rb') as fh: data = fh.read() except TypeError: raise ErrorResponse(HTTP_SERVER_ERROR, b'illegal filename') except OSError as err: if err.errno == errno.ENOENT: raise ErrorResponse(HTTP_NOT_FOUND) else: raise ErrorResponse( HTTP_SERVER_ERROR, encoding.strtolocal(err.strerror) ) res.headers[b'Content-Type'] = ct res.setbodybytes(data) return res def paritygen(stripecount, offset=0): """count parity of horizontal stripes for easier reading""" if stripecount and offset: # account for offset, e.g. due to building the list in reverse count = (stripecount + offset) % stripecount parity = (stripecount + offset) // stripecount & 1 else: count = 0 parity = 0 while True: yield parity count += 1 if stripecount and count >= stripecount: parity = 1 - parity count = 0 def get_contact(config): """Return repo contact information or empty string. web.contact is the primary source, but if that is not set, try ui.username or $EMAIL as a fallback to display something useful. """ return ( config(b"web", b"contact") or config(b"ui", b"username") or encoding.environ.get(b"EMAIL") or b"" ) def cspvalues(ui): """Obtain the Content-Security-Policy header and nonce value. Returns a 2-tuple of the CSP header value and the nonce value. First value is ``None`` if CSP isn't enabled. Second value is ``None`` if CSP isn't enabled or if the CSP header doesn't need a nonce. """ # Without demandimport, "import uuid" could have an immediate side-effect # running "ldconfig" on Linux trying to find libuuid. # With Python <= 2.7.12, that "ldconfig" is run via a shell and the shell # may pollute the terminal with: # # shell-init: error retrieving current directory: getcwd: cannot access # parent directories: No such file or directory # # Python >= 2.7.13 has fixed it by running "ldconfig" directly without a # shell (hg changeset a09ae70f3489). # # Moved "import uuid" from here so it's executed after we know we have # a sane cwd (i.e. after dispatch.py cwd check). # # We can move it back once we no longer need Python <= 2.7.12 support. import uuid # Don't allow untrusted CSP setting since it be disable protections # from a trusted/global source. csp = ui.config(b'web', b'csp', untrusted=False) nonce = None if csp and b'%nonce%' in csp: nonce = base64.urlsafe_b64encode(uuid.uuid4().bytes).rstrip(b'=') csp = csp.replace(b'%nonce%', nonce) return csp, nonce