# 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, incorporated herein by reference.

import os, mimetypes

from mercurial.node import hex, nullid

from mercurial.repo import RepoError

from mercurial import ui, hg, util, hook

from mercurial import revlog, templater, templatefilters

from common import get_mtime, style_map, ErrorResponse

from common import HTTP_OK, HTTP_BAD_REQUEST, HTTP_NOT_FOUND, HTTP_SERVER_ERROR

from common import HTTP_UNAUTHORIZED, HTTP_METHOD_NOT_ALLOWED

from request import wsgirequest

import webcommands, protocol, webutil

perms = {

    'changegroup': 'pull',

    'changegroupsubset': 'pull',

    'unbundle': 'push',

    'stream_out': 'pull',

}

class hgweb(object):

    def __init__(self, repo, name=None):

        if isinstance(repo, str):

            parentui = ui.ui(report_untrusted=False, interactive=False)

            self.repo = hg.repository(parentui, repo)

        else:

            self.repo = repo

        hook.redirect(True)

        self.mtime = -1

        self.reponame = name

        self.archives = 'zip', 'gz', 'bz2'

        self.stripecount = 1

        # a repo owner may set web.templates in .hg/hgrc to get any file

        # readable by the user running the CGI script

        self.templatepath = self.config("web", "templates",

                                        templater.templatepath(),

                                        untrusted=False)

    # The CGI scripts 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 configlist(self, section, name, default=None, untrusted=True):

        return self.repo.ui.configlist(section, name, default,

                                       untrusted=untrusted)

    def refresh(self):

        mtime = get_mtime(self.repo.root)

        if mtime != self.mtime:

            self.mtime = mtime

            self.repo = hg.repository(self.repo.ui, self.repo.root)

            self.maxchanges = int(self.config("web", "maxchanges", 10))

            self.stripecount = int(self.config("web", "stripes", 1))

            self.maxshortchanges = int(self.config("web", "maxshortchanges", 60))

            self.maxfiles = int(self.config("web", "maxfiles", 10))

            self.allowpull = self.configbool("web", "allowpull", True)

            self.encoding = self.config("web", "encoding", util._encoding)

    def run(self):

        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):

        req = wsgirequest(env, respond)

        return self.run_wsgi(req)

    def run_wsgi(self, req):

        self.refresh()

        # 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 cmd and cmd in protocol.__all__:

            try:

                if cmd in perms:

                    try:

                        self.check_perm(req, perms[cmd])

                    except ErrorResponse, inst:

                        if cmd == 'unbundle':

                            req.drain()

                        raise

                method = getattr(protocol, cmd)

                return method(self.repo, req)

            except ErrorResponse, inst:

                req.respond(inst.code, protocol.HGTYPE)

                if not inst.message:

                    return []

                return '0\n%s\n' % inst.message,

        # 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]

        # 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 hasattr(webcommands, cmd):

                req.form['cmd'] = [cmd]

            else:

                cmd = ''

            if cmd == 'static':

                req.form['file'] = ['/'.join(args)]

            else:

                if args and args[0]:

                    node = args.pop(0)

                    req.form['node'] = [node]

                if args:

                    req.form['file'] = args

            if cmd == 'archive':

                fn = req.form['node'][0]

                for type_, spec in self.archive_specs.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 = self.templater(req)

            ctype = tmpl('mimetype', encoding=self.encoding)

            ctype = templater.stringify(ctype)

            # check allow_read / deny_read config options

            self.check_perm(req, None)

            if cmd == '':

                req.form['cmd'] = [tmpl.cache['default']]

                cmd = req.form['cmd'][0]

            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', []):

                self.ctype = ctype

                content = webcommands.rawfile(self, req, tmpl)

            else:

                content = getattr(webcommands, cmd)(self, req, tmpl)

                req.respond(HTTP_OK, ctype)

        except revlog.LookupError, err:

            req.respond(HTTP_NOT_FOUND, ctype)

            msg = str(err)

            if 'manifest' not in msg:

                msg = 'revision not found: %s' % err.name

        except (RepoError, revlog.RevlogError), inst:

            req.respond(HTTP_SERVER_ERROR, ctype)

        except ErrorResponse, inst:

            req.respond(inst.code, ctype)

    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)

        staticurl = self.config("web", "staticurl") or req.url + 'static/'

        if not staticurl.endswith('/'):

            staticurl += '/'

        # some functions for the templater

        def header(**map):

            yield tmpl('header', encoding=self.encoding, **map)

        def footer(**map):

            yield tmpl("footer", **map)

        def motd(**map):

            yield self.config("web", "motd", "")

        # figure out which style to use

        vars = {}

        style = self.config("web", "style", "paper")

        if 'style' in req.form:

            style = req.form['style'][0]

            vars['style'] = style

        start = req.url[-1] == '?' and '&' or '?'

        sessionvars = webutil.sessionvars(vars, start)

        mapfile = style_map(self.templatepath, style)

        if not self.reponame:

            self.reponame = (self.config("web", "name")

                             or req.env.get('REPO_NAME')

                             or req.url.strip('/') or self.repo.root)

        # create the templater

        tmpl = templater.templater(mapfile, templatefilters.filters,

                                   defaults={"url": req.url,

                                             "staticurl": staticurl,

                                             "urlbase": urlbase,

                                             "repo": self.reponame,

                                             "header": header,

                                             "footer": footer,

                                             "motd": motd,

                                             "sessionvars": sessionvars

                                            })

        return tmpl

    def archivelist(self, nodeid):

        allowed = self.configlist("web", "allow_archive")

        for i, spec in self.archive_specs.iteritems():

            if i in allowed or self.configbool("web", "allow" + i):

                yield {"type" : i, "extension" : spec[2], "node" : nodeid}

    archive_specs = {

        'bz2': ('application/x-tar', 'tbz2', '.tar.bz2', None),

        'gz': ('application/x-tar', 'tgz', '.tar.gz', None),

        'zip': ('application/zip', 'zip', '.zip', None),

        }

    def check_perm(self, req, op):

        '''Check permission for operation based on request data (including

        authentication info). Return if op allowed, else raise an ErrorResponse

        exception.'''

        user = req.env.get('REMOTE_USER')

        deny_read = self.configlist('web', 'deny_read')

        if deny_read and (not user or deny_read == ['*'] or user in deny_read):

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized')

        allow_read = self.configlist('web', 'allow_read')

        result = (not allow_read) or (allow_read == ['*']) or (user in allow_read)

        if not result:

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized')

        if op == 'pull' and not self.allowpull:

            raise ErrorResponse(HTTP_OK, '')

        # op is None when checking allow/deny_read permissions for a web-browser request

        elif op == 'pull' or op is None:

            return

        # enforce that you can only push using POST requests

        if req.env['REQUEST_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

        scheme = req.env.get('wsgi.url_scheme')

        if self.configbool('web', 'push_ssl', True) and scheme != 'https':

            raise ErrorResponse(HTTP_OK, 'ssl required')

        deny = self.configlist('web', 'deny_push')

        if deny and (not user or deny == ['*'] or user in deny):

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')

        allow = self.configlist('web', 'allow_push')

        result = allow and (allow == ['*'] or user in allow)

        if not result:

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'push not authorized')