hgweb: assign ctype to requestcontext
The very existence of ctype is a bit hacky. But we roll with it.
Before this patch, there was possibly a race condition between 2
threads handling file requests: 1 thread could set the ctype and
another serving a different file would read and use that potentially
wrong ctype.
# hgweb/hgweb_mod.py - Web interface for a repository.
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
# Copyright 2005-2007 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.
import os
from mercurial import ui, hg, hook, error, encoding, templater, util, repoview
from mercurial.templatefilters import websub
from common import get_stat, ErrorResponse, permhooks, caching
from common import HTTP_OK, HTTP_NOT_MODIFIED, HTTP_BAD_REQUEST
from common import HTTP_NOT_FOUND, HTTP_SERVER_ERROR
from request import wsgirequest
import webcommands, protocol, webutil
perms = {
'changegroup': 'pull',
'changegroupsubset': 'pull',
'getbundle': 'pull',
'stream_out': 'pull',
'listkeys': 'pull',
'unbundle': 'push',
'pushkey': 'push',
}
## Files of interest
# Used to check if the repository has changed looking at mtime and size of
# theses files. This should probably be relocated a bit higher in core.
foi = [('spath', '00changelog.i'),
('spath', 'phaseroots'), # ! phase can change content at the same size
('spath', 'obsstore'),
('path', 'bookmarks'), # ! bookmark can change content at the same size
]
def makebreadcrumb(url, prefix=''):
'''Return a 'URL breadcrumb' list
A 'URL breadcrumb' is a list of URL-name pairs,
corresponding to each of the path items on a URL.
This can be used to create path navigation entries.
'''
if url.endswith('/'):
url = url[:-1]
if prefix:
url = '/' + prefix + url
relpath = url
if relpath.startswith('/'):
relpath = relpath[1:]
breadcrumb = []
urlel = url
pathitems = [''] + relpath.split('/')
for pathel in reversed(pathitems):
if not pathel or not urlel:
break
breadcrumb.append({'url': urlel, 'name': pathel})
urlel = os.path.dirname(urlel)
return reversed(breadcrumb)
class requestcontext(object):
"""Holds state/context for an individual request.
Servers can be multi-threaded. Holding state on the WSGI application
is prone to race conditions. Instances of this class exist to hold
mutable and race-free state for requests.
"""
def __init__(self, app):
object.__setattr__(self, 'app', app)
object.__setattr__(self, 'repo', app.repo)
object.__setattr__(self, 'reponame', app.reponame)
object.__setattr__(self, 'archives', ('zip', 'gz', 'bz2'))
object.__setattr__(self, 'maxchanges',
self.configint('web', 'maxchanges', 10))
object.__setattr__(self, 'stripecount',
self.configint('web', 'stripes', 1))
object.__setattr__(self, 'maxshortchanges',
self.configint('web', 'maxshortchanges', 60))
object.__setattr__(self, 'maxfiles',
self.configint('web', 'maxfiles', 10))
object.__setattr__(self, 'allowpull',
self.configbool('web', 'allowpull', True))
# we use untrusted=False to prevent a repo owner from using
# web.templates in .hg/hgrc to get access to any file readable
# by the user running the CGI script
object.__setattr__(self, 'templatepath',
self.config('web', 'templates', untrusted=False))
# This object is more expensive to build than simple config values.
# It is shared across requests. The app will replace the object
# if it is updated. Since this is a reference and nothing should
# modify the underlying object, it should be constant for the lifetime
# of the request.
object.__setattr__(self, 'websubtable', app.websubtable)
# Proxy unknown reads and writes to the application instance
# until everything is moved to us.
def __getattr__(self, name):
return getattr(self.app, name)
def __setattr__(self, name, value):
return setattr(self.app, name, value)
# Servers are often run by a user different from the repo owner.
# Trust the settings from the .hg/hgrc files by default.
def config(self, section, name, default=None, untrusted=True):
return self.repo.ui.config(section, name, default,
untrusted=untrusted)
def configbool(self, section, name, default=False, untrusted=True):
return self.repo.ui.configbool(section, name, default,
untrusted=untrusted)
def configint(self, section, name, default=None, untrusted=True):
return self.repo.ui.configint(section, name, default,
untrusted=untrusted)
def configlist(self, section, name, default=None, untrusted=True):
return self.repo.ui.configlist(section, name, default,
untrusted=untrusted)
archivespecs = {
'bz2': ('application/x-bzip2', 'tbz2', '.tar.bz2', None),
'gz': ('application/x-gzip', 'tgz', '.tar.gz', None),
'zip': ('application/zip', 'zip', '.zip', None),
}
def archivelist(self, nodeid):
allowed = self.configlist('web', 'allow_archive')
for typ, spec in self.archivespecs.iteritems():
if typ in allowed or self.configbool('web', 'allow%s' % typ):
yield {'type': typ, 'extension': spec[2], 'node': nodeid}
def templater(self, req):
# determine scheme, port and server name
# this is needed to create absolute urls
proto = req.env.get('wsgi.url_scheme')
if proto == 'https':
proto = 'https'
default_port = '443'
else:
proto = 'http'
default_port = '80'
port = req.env['SERVER_PORT']
port = port != default_port and (':' + port) or ''
urlbase = '%s://%s%s' % (proto, req.env['SERVER_NAME'], port)
logourl = self.config('web', 'logourl', 'http://mercurial.selenic.com/')
logoimg = self.config('web', 'logoimg', 'hglogo.png')
staticurl = self.config('web', 'staticurl') or req.url + 'static/'
if not staticurl.endswith('/'):
staticurl += '/'
# some functions for the templater
def motd(**map):
yield self.config('web', 'motd', '')
# figure out which style to use
vars = {}
styles = (
req.form.get('style', [None])[0],
self.config('web', 'style'),
'paper',
)
style, mapfile = templater.stylemap(styles, self.templatepath)
if style == styles[0]:
vars['style'] = style
start = req.url[-1] == '?' and '&' or '?'
sessionvars = webutil.sessionvars(vars, start)
if not self.reponame:
object.__setattr__(self, 'reponame',
(self.config('web', 'name')
or req.env.get('REPO_NAME')
or req.url.strip('/') or self.repo.root))
def websubfilter(text):
return websub(text, self.websubtable)
# create the templater
tmpl = templater.templater(mapfile,
filters={'websub': websubfilter},
defaults={'url': req.url,
'logourl': logourl,
'logoimg': logoimg,
'staticurl': staticurl,
'urlbase': urlbase,
'repo': self.reponame,
'encoding': encoding.encoding,
'motd': motd,
'sessionvars': sessionvars,
'pathdef': makebreadcrumb(req.url),
'style': style,
})
return tmpl
class hgweb(object):
"""HTTP server for individual repositories.
Instances of this class serve HTTP responses for a particular
repository.
Instances are typically used as WSGI applications.
Some servers are multi-threaded. On these servers, there may
be multiple active threads inside __call__.
"""
def __init__(self, repo, name=None, baseui=None):
if isinstance(repo, str):
if baseui:
u = baseui.copy()
else:
u = ui.ui()
r = hg.repository(u, repo)
else:
# we trust caller to give us a private copy
r = repo
r = getwebview(r)
r.ui.setconfig('ui', 'report_untrusted', 'off', 'hgweb')
r.baseui.setconfig('ui', 'report_untrusted', 'off', 'hgweb')
r.ui.setconfig('ui', 'nontty', 'true', 'hgweb')
r.baseui.setconfig('ui', 'nontty', 'true', 'hgweb')
# displaying bundling progress bar while serving feel wrong and may
# break some wsgi implementation.
r.ui.setconfig('progress', 'disable', 'true', 'hgweb')
r.baseui.setconfig('progress', 'disable', 'true', 'hgweb')
self.repo = r
hook.redirect(True)
self.repostate = None
self.mtime = -1
self.reponame = name
def refresh(self):
repostate = []
mtime = 0
# file of interrests mtime and size
for meth, fname in foi:
prefix = getattr(self.repo, meth)
st = get_stat(prefix, fname)
repostate.append((st.st_mtime, st.st_size))
mtime = max(mtime, st.st_mtime)
repostate = tuple(repostate)
# we need to compare file size in addition to mtime to catch
# changes made less than a second ago
if repostate != self.repostate:
r = hg.repository(self.repo.baseui, self.repo.url())
self.repo = getwebview(r)
# update these last to avoid threads seeing empty settings
self.repostate = repostate
# mtime is needed for ETag
self.mtime = mtime
self.websubtable = webutil.getwebsubs(r)
def run(self):
"""Start a server from CGI environment.
Modern servers should be using WSGI and should avoid this
method, if possible.
"""
if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."):
raise RuntimeError("This function is only intended to be "
"called while running as a CGI script.")
import mercurial.hgweb.wsgicgi as wsgicgi
wsgicgi.launch(self)
def __call__(self, env, respond):
"""Run the WSGI application.
This may be called by multiple threads.
"""
req = wsgirequest(env, respond)
return self.run_wsgi(req)
def run_wsgi(self, req):
"""Internal method to run the WSGI application.
This is typically only called by Mercurial. External consumers
should be using instances of this class as the WSGI application.
"""
self.refresh()
rctx = requestcontext(self)
# This state is global across all threads.
encoding.encoding = rctx.config('web', 'encoding', encoding.encoding)
rctx.repo.ui.environ = req.env
# work with CGI variables to create coherent structure
# use SCRIPT_NAME, PATH_INFO and QUERY_STRING as well as our REPO_NAME
req.url = req.env['SCRIPT_NAME']
if not req.url.endswith('/'):
req.url += '/'
if 'REPO_NAME' in req.env:
req.url += req.env['REPO_NAME'] + '/'
if 'PATH_INFO' in req.env:
parts = req.env['PATH_INFO'].strip('/').split('/')
repo_parts = req.env.get('REPO_NAME', '').split('/')
if parts[:len(repo_parts)] == repo_parts:
parts = parts[len(repo_parts):]
query = '/'.join(parts)
else:
query = req.env['QUERY_STRING'].split('&', 1)[0]
query = query.split(';', 1)[0]
# process this if it's a protocol request
# protocol bits don't need to create any URLs
# and the clients always use the old URL structure
cmd = req.form.get('cmd', [''])[0]
if protocol.iscmd(cmd):
try:
if query:
raise ErrorResponse(HTTP_NOT_FOUND)
if cmd in perms:
self.check_perm(rctx, req, perms[cmd])
return protocol.call(rctx.repo, req, cmd)
except ErrorResponse as inst:
# A client that sends unbundle without 100-continue will
# break if we respond early.
if (cmd == 'unbundle' and
(req.env.get('HTTP_EXPECT',
'').lower() != '100-continue') or
req.env.get('X-HgHttp2', '')):
req.drain()
else:
req.headers.append(('Connection', 'Close'))
req.respond(inst, protocol.HGTYPE,
body='0\n%s\n' % inst)
return ''
# translate user-visible url structure to internal structure
args = query.split('/', 2)
if 'cmd' not in req.form and args and args[0]:
cmd = args.pop(0)
style = cmd.rfind('-')
if style != -1:
req.form['style'] = [cmd[:style]]
cmd = cmd[style + 1:]
# avoid accepting e.g. style parameter as command
if util.safehasattr(webcommands, cmd):
req.form['cmd'] = [cmd]
if cmd == 'static':
req.form['file'] = ['/'.join(args)]
else:
if args and args[0]:
node = args.pop(0).replace('%2F', '/')
req.form['node'] = [node]
if args:
req.form['file'] = args
ua = req.env.get('HTTP_USER_AGENT', '')
if cmd == 'rev' and 'mercurial' in ua:
req.form['style'] = ['raw']
if cmd == 'archive':
fn = req.form['node'][0]
for type_, spec in rctx.archivespecs.iteritems():
ext = spec[2]
if fn.endswith(ext):
req.form['node'] = [fn[:-len(ext)]]
req.form['type'] = [type_]
# process the web interface request
try:
tmpl = rctx.templater(req)
ctype = tmpl('mimetype', encoding=encoding.encoding)
ctype = templater.stringify(ctype)
# check read permissions non-static content
if cmd != 'static':
self.check_perm(rctx, req, None)
if cmd == '':
req.form['cmd'] = [tmpl.cache['default']]
cmd = req.form['cmd'][0]
if rctx.configbool('web', 'cache', True):
caching(self, req) # sets ETag header or raises NOT_MODIFIED
if cmd not in webcommands.__all__:
msg = 'no such method: %s' % cmd
raise ErrorResponse(HTTP_BAD_REQUEST, msg)
elif cmd == 'file' and 'raw' in req.form.get('style', []):
# TODO convert to regular assignment once app proxy is removed.
object.__setattr__(rctx, 'ctype', ctype)
content = webcommands.rawfile(rctx, req, tmpl)
else:
content = getattr(webcommands, cmd)(rctx, req, tmpl)
req.respond(HTTP_OK, ctype)
return content
except (error.LookupError, error.RepoLookupError) as err:
req.respond(HTTP_NOT_FOUND, ctype)
msg = str(err)
if (util.safehasattr(err, 'name') and
not isinstance(err, error.ManifestLookupError)):
msg = 'revision not found: %s' % err.name
return tmpl('error', error=msg)
except (error.RepoError, error.RevlogError) as inst:
req.respond(HTTP_SERVER_ERROR, ctype)
return tmpl('error', error=str(inst))
except ErrorResponse as inst:
req.respond(inst, ctype)
if inst.code == HTTP_NOT_MODIFIED:
# Not allowed to return a body on a 304
return ['']
return tmpl('error', error=str(inst))
def check_perm(self, rctx, req, op):
for permhook in permhooks:
permhook(rctx, req, op)
def getwebview(repo):
"""The 'web.view' config controls changeset filter to hgweb. Possible
values are ``served``, ``visible`` and ``all``. Default is ``served``.
The ``served`` filter only shows changesets that can be pulled from the
hgweb instance. The``visible`` filter includes secret changesets but
still excludes "hidden" one.
See the repoview module for details.
The option has been around undocumented since Mercurial 2.5, but no
user ever asked about it. So we better keep it undocumented for now."""
viewconfig = repo.ui.config('web', 'view', 'served',
untrusted=True)
if viewconfig == 'all':
return repo.unfiltered()
elif viewconfig in repoview.filtertable:
return repo.filtered(viewconfig)
else:
return repo.filtered('served')