Mercurial > hg
view mercurial/hgweb/common.py @ 37578:56df2ca5c032
py3: prevent transformer from adding b'' by adding r'' prefix
These are cases where we need to use str, therefore we add r'' prefix.
# skip-blame because just r'' prefixes
Differential Revision: https://phab.mercurial-scm.org/D3276
author | Pulkit Goyal <7895pulkit@gmail.com> |
---|---|
date | Thu, 12 Apr 2018 14:28:08 +0530 |
parents | cc0a6ea95d98 |
children | 31a0d47d69b3 |
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# 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 Matt Mackall <mpm@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. from __future__ import absolute_import import base64 import errno import mimetypes import os import stat from .. import ( encoding, pycompat, 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_SERVER_ERROR = 500 def ismember(ui, username, userlist): """Check if username is a member of userlist. If userlist has a single '*' member, all users are considered members. Can be overridden by extensions to provide more complex authorization schemes. """ return userlist == ['*'] or username in userlist 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('web', 'deny_read') if deny_read and (not user or ismember(hgweb.repo.ui, user, deny_read)): raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') allow_read = hgweb.configlist('web', 'allow_read') if allow_read and (not ismember(hgweb.repo.ui, user, allow_read)): raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized') if op == 'pull' and not hgweb.allowpull: raise ErrorResponse(HTTP_UNAUTHORIZED, 'pull not authorized') elif op == 'pull' or op is None: # op is None for interface requests return # Allow LFS uploading via PUT requests if op == 'upload': if req.method != 'PUT': msg = 'upload requires PUT request' raise ErrorResponse(HTTP_METHOD_NOT_ALLOWED, msg) # enforce that you can only push using POST requests elif req.method != 'POST': msg = '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('web', 'push_ssl') and req.urlscheme != 'https': raise ErrorResponse(HTTP_FORBIDDEN, 'ssl required') deny = hgweb.configlist('web', 'deny_push') if deny and (not user or ismember(hgweb.repo.ui, user, deny)): raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized') allow = hgweb.configlist('web', 'allow-push') if not (allow and ismember(hgweb.repo.ui, user, allow)): raise ErrorResponse(HTTP_UNAUTHORIZED, '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 class continuereader(object): """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('HTTP/1.1 100 Continue\r\n\r\n') return self.f.read(amt) def __getattr__(self, attr): if attr in ('close', 'readline', 'readlines', '__iter__'): return getattr(self.f, attr) raise AttributeError def _statusmessage(code): responses = httpserver.basehttprequesthandler.responses return responses.get(code, ('Error', 'Unknown error'))[0] def statusmessage(code, message=None): return '%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, "00changelog.i")[stat.ST_MTIME] def ispathsafe(path): """Determine if a path is safe to use for filesystem access.""" parts = path.split('/') for part in parts: if (part in ('', 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(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 fpath = os.path.join(*fname.split('/')) if isinstance(directory, str): directory = [directory] for d in directory: path = os.path.join(d, fpath) if os.path.exists(path): break try: os.stat(path) ct = mimetypes.guess_type(pycompat.fsdecode(path))[0] or "text/plain" with open(path, 'rb') as fh: data = fh.read() res.headers['Content-Type'] = ct res.setbodybytes(data) return res except TypeError: raise ErrorResponse(HTTP_SERVER_ERROR, '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)) 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("web", "contact") or config("ui", "username") or encoding.environ.get("EMAIL") or "") 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('web', 'csp', untrusted=False) nonce = None if csp and '%nonce%' in csp: nonce = base64.urlsafe_b64encode(uuid.uuid4().bytes).rstrip('=') csp = csp.replace('%nonce%', nonce) return csp, nonce