# hgweb/hgwebdir_mod.py - Web interface for a directory of repositories.

#

# 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, incorporated herein by reference.

import os, re, time

from mercurial.i18n import _

from mercurial import ui, hg, util, templater

from mercurial import error, encoding

from common import ErrorResponse, get_mtime, staticfile, paritygen,\

                   get_contact, HTTP_OK, HTTP_NOT_FOUND, HTTP_SERVER_ERROR

from hgweb_mod import hgweb

from request import wsgirequest

import webutil

def cleannames(items):

    return [(util.pconvert(name).strip('/'), path) for name, path in items]

def findrepos(paths):

    repos = []

    for prefix, root in cleannames(paths):

        roothead, roottail = os.path.split(root)

        # "foo = /bar/*" makes every subrepo of /bar/ to be

        # mounted as foo/subrepo

        # and "foo = /bar/**" also recurses into the subdirectories,

        # remember to use it without working dir.

        try:

            recurse = {'*': False, '**': True}[roottail]

        except KeyError:

            repos.append((prefix, root))

            continue

        roothead = os.path.normpath(roothead)

        for path in util.walkrepos(roothead, followsym=True, recurse=recurse):

            path = os.path.normpath(path)

            name = util.pconvert(path[len(roothead):]).strip('/')

            if prefix:

                name = prefix + '/' + name

            repos.append((name, path))

    return repos

class hgwebdir(object):

    refreshinterval = 20

    def __init__(self, conf, baseui=None):

        self.conf = conf

        self.baseui = baseui

        self.lastrefresh = 0

        self.refresh()

    def refresh(self):

        if self.lastrefresh + self.refreshinterval > time.time():

            return

        if self.baseui:

            self.ui = self.baseui.copy()

        else:

            self.ui = ui.ui()

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

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

        if not isinstance(self.conf, (dict, list, tuple)):

            map = {'paths': 'hgweb-paths'}

            self.ui.readconfig(self.conf, remap=map, trust=True)

            paths = self.ui.configitems('hgweb-paths')

        elif isinstance(self.conf, (list, tuple)):

            paths = self.conf

        elif isinstance(self.conf, dict):

            paths = self.conf.items()

        encoding.encoding = self.ui.config('web', 'encoding',

                                           encoding.encoding)

        self.style = self.ui.config('web', 'style', 'paper')

        self.stripecount = self.ui.config('web', 'stripes', 1)

        if self.stripecount:

            self.stripecount = int(self.stripecount)

        self._baseurl = self.ui.config('web', 'baseurl')

        self.repos = findrepos(paths)

        for prefix, root in self.ui.configitems('collections'):

            prefix = util.pconvert(prefix)

            for path in util.walkrepos(root, followsym=True):

                repo = os.path.normpath(path)

                name = util.pconvert(repo)

                if name.startswith(prefix):

                    name = name[len(prefix):]

                self.repos.append((name.lstrip('/'), repo))

        self.lastrefresh = time.time()

    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 read_allowed(self, ui, req):

        """Check allow_read and deny_read config options of a repo's ui object

        to determine user permissions.  By default, with neither option set (or

        both empty), allow all users to read the repo.  There are two ways a

        user can be denied read access:  (1) deny_read is not empty, and the

        user is unauthenticated or deny_read contains user (or *), and (2)

        allow_read is not empty and the user is not in allow_read.  Return True

        if user is allowed to read the repo, else return False."""

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

        deny_read = ui.configlist('web', 'deny_read', untrusted=True)

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

            return False

        allow_read = ui.configlist('web', 'allow_read', untrusted=True)

        # by default, allow reading if no allow_read option has been set

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

            return True

        return False

    def run_wsgi(self, req):

        try:

            try:

                self.refresh()

                virtual = req.env.get("PATH_INFO", "").strip('/')

                tmpl = self.templater(req)

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

                ctype = templater.stringify(ctype)

                # a static file

                if virtual.startswith('static/') or 'static' in req.form:

                    if virtual.startswith('static/'):

                        fname = virtual[7:]

                    else:

                        fname = req.form['static'][0]

                    static = templater.templatepath('static')

                    return (staticfile(static, fname, req),)

                # top-level index

                elif not virtual:

                    req.respond(HTTP_OK, ctype)

                    return self.makeindex(req, tmpl)

                # nested indexes and hgwebs

                repos = dict(self.repos)

                while virtual:

                    real = repos.get(virtual)

                    if real:

                        req.env['REPO_NAME'] = virtual

                        try:

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

                            return hgweb(repo).run_wsgi(req)

                        except IOError, inst:

                            msg = inst.strerror

                            raise ErrorResponse(HTTP_SERVER_ERROR, msg)

                        except error.RepoError, inst:

                            raise ErrorResponse(HTTP_SERVER_ERROR, str(inst))

                    # browse subdirectories

                    subdir = virtual + '/'

                    if [r for r in repos if r.startswith(subdir)]:

                        req.respond(HTTP_OK, ctype)

                        return self.makeindex(req, tmpl, subdir)

                    up = virtual.rfind('/')

                    if up < 0:

                        break

                    virtual = virtual[:up]

                # prefixes not found

                req.respond(HTTP_NOT_FOUND, ctype)

                return tmpl("notfound", repo=virtual)

            except ErrorResponse, err:

                req.respond(err, ctype)

                return tmpl('error', error=err.message or '')

        finally:

            tmpl = None

    def makeindex(self, req, tmpl, subdir=""):

        def archivelist(ui, nodeid, url):

            allowed = ui.configlist("web", "allow_archive", untrusted=True)

            for i in [('zip', '.zip'), ('gz', '.tar.gz'), ('bz2', '.tar.bz2')]:

                if i[0] in allowed or ui.configbool("web", "allow" + i[0],

                                                    untrusted=True):

                    yield {"type" : i[0], "extension": i[1],

                           "node": nodeid, "url": url}

        sortdefault = None, False

        def entries(sortcolumn="", descending=False, subdir="", **map):

            rows = []

            parity = paritygen(self.stripecount)

            descend = self.ui.configbool('web', 'descend', True)

            for name, path in self.repos:

                if not name.startswith(subdir):

                    continue

                name = name[len(subdir):]

                if not descend and '/' in name:

                    continue

                u = self.ui.copy()

                try:

                    u.readconfig(os.path.join(path, '.hg', 'hgrc'))

                except Exception, e:

                    u.warn(_('error reading %s/.hg/hgrc: %s\n') % (path, e))

                    continue

                def get(section, name, default=None):

                    return u.config(section, name, default, untrusted=True)

                if u.configbool("web", "hidden", untrusted=True):

                    continue

                if not self.read_allowed(u, req):

                    continue

                parts = [name]

                if 'PATH_INFO' in req.env:

                    parts.insert(0, req.env['PATH_INFO'].rstrip('/'))

                if req.env['SCRIPT_NAME']:

                    parts.insert(0, req.env['SCRIPT_NAME'])

                m = re.match('((?:https?://)?)(.*)', '/'.join(parts))

                # squish repeated slashes out of the path component

                url = m.group(1) + re.sub('/+', '/', m.group(2)) + '/'

                # update time with local timezone

                try:

                    d = (get_mtime(path), util.makedate()[1])

                except OSError:

                    continue

                contact = get_contact(get)

                description = get("web", "description", "")

                name = get("web", "name", name)

                row = dict(contact=contact or "unknown",

                           contact_sort=contact.upper() or "unknown",

                           name=name,

                           name_sort=name,

                           url=url,

                           description=description or "unknown",

                           description_sort=description.upper() or "unknown",

                           lastchange=d,

                           lastchange_sort=d[1]-d[0],

                           archives=archivelist(u, "tip", url))

                if (not sortcolumn or (sortcolumn, descending) == sortdefault):

                    # fast path for unsorted output

                    row['parity'] = parity.next()

                    yield row

                else:

                    rows.append((row["%s_sort" % sortcolumn], row))

            if rows:

                rows.sort()

                if descending:

                    rows.reverse()

                for key, row in rows:

                    row['parity'] = parity.next()

                    yield row

        self.refresh()

        sortable = ["name", "description", "contact", "lastchange"]

        sortcolumn, descending = sortdefault

        if 'sort' in req.form:

            sortcolumn = req.form['sort'][0]

            descending = sortcolumn.startswith('-')

            if descending:

                sortcolumn = sortcolumn[1:]

            if sortcolumn not in sortable:

                sortcolumn = ""

        sort = [("sort_%s" % column,

                 "%s%s" % ((not descending and column == sortcolumn)

                            and "-" or "", column))

                for column in sortable]

        self.refresh()

        if self._baseurl is not None:

            req.env['SCRIPT_NAME'] = self._baseurl

        return tmpl("index", entries=entries, subdir=subdir,

                    sortcolumn=sortcolumn, descending=descending,

                    **dict(sort))

    def templater(self, req):

        def header(**map):

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

        def footer(**map):

            yield tmpl("footer", **map)

        def motd(**map):

            if self.motd is not None:

                yield self.motd

            else:

                yield config('web', 'motd', '')

        def config(section, name, default=None, untrusted=True):

            return self.ui.config(section, name, default, untrusted)

        if self._baseurl is not None:

            req.env['SCRIPT_NAME'] = self._baseurl

        url = req.env.get('SCRIPT_NAME', '')

        if not url.endswith('/'):

            url += '/'

        vars = {}

        styles = (

            req.form.get('style', [None])[0],

            config('web', 'style'),

            'paper'

        )

        style, mapfile = templater.stylemap(styles)

        if style == styles[0]:

            vars['style'] = style

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

        sessionvars = webutil.sessionvars(vars, start)

        staticurl = config('web', 'staticurl') or url + 'static/'

        if not staticurl.endswith('/'):

            staticurl += '/'

        tmpl = templater.templater(mapfile,

                                   defaults={"header": header,

                                             "footer": footer,

                                             "motd": motd,

                                             "url": url,

                                             "staticurl": staticurl,

                                             "sessionvars": sessionvars})

        return tmpl