# 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

import os

from mercurial import ui, hg, hook, error, encoding, templater

from common import get_mtime, 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):

            u = ui.ui()

            u.setconfig('ui', 'report_untrusted', 'off')

            u.setconfig('ui', 'interactive', 'off')

            self.repo = hg.repository(u, 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')

    # 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)

            encoding.encoding = self.config("web", "encoding",

                                            encoding.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()

        # 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 cmd and cmd in protocol.__all__:

            if query:

                raise ErrorResponse(HTTP_NOT_FOUND)

            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, protocol.HGTYPE)

                if not inst.message:

                    return []

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

        # 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

            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 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=encoding.encoding)

            ctype = templater.stringify(ctype)

            # check read permissions non-static content

            if cmd != 'static':

                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)

            return content

        except error.LookupError, err:

            req.respond(HTTP_NOT_FOUND, ctype)

            msg = str(err)

            if 'manifest' not in msg:

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

            return tmpl('error', error=msg)

        except (error.RepoError, error.RevlogError), inst:

            req.respond(HTTP_SERVER_ERROR, ctype)

            return tmpl('error', error=str(inst))

        except ErrorResponse, inst:

            req.respond(inst, ctype)

            return tmpl('error', error=inst.message)

    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=encoding.encoding, **map)

        def footer(**map):

            yield tmpl("footer", **map)

        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:

            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,

                                   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 == ['*'])

        if not (result or user in allow_read):

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'read not authorized')

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

            raise ErrorResponse(HTTP_UNAUTHORIZED, 'pull not authorized')

        elif op == 'pull' or op is None: # op is None for interface requests

            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')