"""security management and error screens

:organization: Logilab

:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

_ = unicode

from logilab.mtconverter import xml_escape

from cubicweb.selectors import yes, none_rset, match_user_groups, authenticated_user

from cubicweb.view import AnyRsetView, StartupView, EntityView, View

from cubicweb.uilib import html_traceback, rest_traceback

from cubicweb.web import formwidgets as wdgs

from cubicweb.web.formfields import guess_field

SUBMIT_MSGID = _('Submit bug report')

MAIL_SUBMIT_MSGID = _('Submit bug report by mail')

class SecurityViewMixIn(object):

    """display security information for a given schema """

    def schema_definition(self, eschema, link=True,  access_types=None):

        w = self.w

        _ = self._cw._

        if not access_types:

            access_types = eschema.ACTIONS

        w(u'<table class="schemaInfo">')

        w(u'<tr><th>%s</th><th>%s</th><th>%s</th></tr>' % (

            _("permission"), _('granted to groups'), _('rql expressions')))

        for access_type in access_types:

            w(u'<tr>')

            w(u'<td>%s</td>' % self._cw.__('%s_perm' % access_type))

            groups = eschema.get_groups(access_type)

            l = []

            groups = [(_(group), group) for group in groups]

            for trad, group in sorted(groups):

                if link:

                    # XXX we should get a group entity and call its absolute_url

                    # method

                    l.append(u'<a href="%s" class="%s">%s</a><br/>' % (

                    self._cw.build_url('cwgroup/%s' % group), group, trad))

                else:

                    l.append(u'<div class="%s">%s</div>' % (group, trad))

            w(u'<td>%s</td>' % u''.join(l))

            rqlexprs = eschema.get_rqlexprs(access_type)

            w(u'<td>%s</td>' % u'<br/><br/>'.join(expr.expression for expr in rqlexprs))

            w(u'</tr>\n')

        w(u'</table>')

    def has_schema_modified_permissions(self, eschema, access_types):

        """ return True if eschema's actual permissions are diffrents

        from the default ones

        """

        for access_type in access_types:

            if eschema.get_rqlexprs(access_type):

                return True

            if eschema.get_groups(access_type) != \

                    frozenset(eschema.get_default_groups()[access_type]):

                return True

        return False

class SecurityManagementView(EntityView, SecurityViewMixIn):

    """display security information for a given entity"""

    __regid__ = 'security'

    __select__ = EntityView.__select__ & authenticated_user()

    title = _('security')

    def call(self):

        self.w(u'<div id="progress">%s</div>' % self._cw._('validating...'))

        super(SecurityManagementView, self).call()

    def cell_call(self, row, col):

        self._cw.add_js('cubicweb.edition.js')

        self._cw.add_css('cubicweb.acl.css')

        entity = self.cw_rset.get_entity(row, col)

        w = self.w

        _ = self._cw._

        w(u'<h1><span class="etype">%s</span> <a href="%s">%s</a></h1>'

          % (entity.dc_type().capitalize(),

             xml_escape(entity.absolute_url()),

             xml_escape(entity.dc_title())))

        # first show permissions defined by the schema

        self.w('<h2>%s</h2>' % _('schema\'s permissions definitions'))

        self.schema_definition(entity.e_schema)

        self.w('<h2>%s</h2>' % _('manage security'))

        # ownership information

        if self._cw.vreg.schema.rschema('owned_by').has_perm(self._cw, 'add',

                                                    fromeid=entity.eid):

            self.owned_by_edit_form(entity)

        else:

            self.owned_by_information(entity)

        # cwpermissions

        if 'require_permission' in entity.e_schema.subject_relations():

            w('<h3>%s</h3>' % _('permissions for this entity'))

            reqpermschema = self._cw.vreg.schema.rschema('require_permission')

            self.require_permission_information(entity, reqpermschema)

            if reqpermschema.has_perm(self._cw, 'add', fromeid=entity.eid):

                self.require_permission_edit_form(entity)

    def owned_by_edit_form(self, entity):

        self.w('<h3>%s</h3>' % self._cw._('ownership'))

        msg = self._cw._('ownerships have been changed')

        form = self._cw.vreg['forms'].select('base', self._cw, entity=entity,

                                         form_renderer_id='base', submitmsg=msg,

                                         form_buttons=[wdgs.SubmitButton()],

                                         domid='ownership%s' % entity.eid,

                                         __redirectvid='security',

                                         __redirectpath=entity.rest_path())

        field = guess_field(entity.e_schema, self._cw.vreg.schema.rschema('owned_by'))

        form.append_field(field)

        self.w(form.render(display_progress_div=False))

    def owned_by_information(self, entity):

        ownersrset = entity.related('owned_by')

        if ownersrset:

            self.w('<h3>%s</h3>' % self._cw._('ownership'))

            self.w(u'<div class="ownerInfo">')

            self.w(self._cw._('this entity is currently owned by') + ' ')

            self.wview('csv', entity.related('owned_by'), 'null')

            self.w(u'</div>')

        # else we don't know if this is because entity has no owner or becayse

        # user as no access to owner users entities

    def require_permission_information(self, entity, reqpermschema):

        if entity.require_permission:

            w = self.w

            _ = self._cw._

            if reqpermschema.has_perm(self._cw, 'delete', fromeid=entity.eid):

                delurl = self._cw.build_url('edit', __redirectvid='security',

                                            __redirectpath=entity.rest_path())

                delurl = delurl.replace('%', '%%')

                # don't give __delete value to build_url else it will be urlquoted

                # and this will replace %s by %25s

                delurl += '&__delete=%s:require_permission:%%s' % entity.eid

                dellinktempl = u'[<a href="%s" title="%s">-</a>]&#160;' % (

                    xml_escape(delurl), _('delete this permission'))

            else:

                dellinktempl = None

            w(u'<table class="schemaInfo">')

            w(u'<tr><th>%s</th><th>%s</th></tr>' % (_("permission"),

                                                    _('granted to groups')))

            for cwperm in entity.require_permission:

                w(u'<tr>')

                if dellinktempl:

                    w(u'<td>%s%s</td>' % (dellinktempl % cwperm.eid,

                                          cwperm.view('oneline')))

                else:

                    w(u'<td>%s</td>' % cwperm.view('oneline'))

                w(u'<td>%s</td>' % self.view('csv', cwperm.related('require_group'), 'null'))

                w(u'</tr>\n')

            w(u'</table>')

        else:

            self.w(self._cw._('no associated permissions'))

    def require_permission_edit_form(self, entity):

        newperm = self._cw.vreg['etypes'].etype_class('CWPermission')(self._cw)

        newperm.eid = self._cw.varmaker.next()

        self.w(u'<p>%s</p>' % self._cw._('add a new permission'))

        form = self._cw.vreg['forms'].select('base', self._cw, entity=newperm,

                                         form_buttons=[wdgs.SubmitButton()],

                                         domid='reqperm%s' % entity.eid,

                                         __redirectvid='security',

                                         __redirectpath=entity.rest_path())

        form.add_hidden('require_permission', entity.eid, role='object',

                        eidparam=True)

        permnames = getattr(entity, '__permissions__', None)

        cwpermschema = newperm.e_schema

        if permnames is not None:

            field = guess_field(cwpermschema, self._cw.vreg.schema.rschema('name'),

                                widget=wdgs.Select({'size': 1}),

                                choices=permnames)

        else:

            field = guess_field(cwpermschema, self._cw.vreg.schema.rschema('name'))

        form.append_field(field)

        field = guess_field(cwpermschema, self._cw.vreg.schema.rschema('label'))

        form.append_field(field)

        field = guess_field(cwpermschema, self._cw.vreg.schema.rschema('require_group'))

        form.append_field(field)

        renderer = self._cw.vreg['formrenderers'].select(

            'htable', self._cw, rset=None, display_progress_div=False)

        self.w(form.render(renderer=renderer))

class ErrorView(AnyRsetView):

    """default view when no result has been found"""

    __select__ = yes()

    __regid__ = 'error'

    def page_title(self):

        """returns a title according to the result set - used for the

        title in the HTML header

        """

        return self._cw._('an error occured')

    def call(self):

        req = self._cw.reset_headers()

        w = self.w

        ex = req.data.get('ex')#_("unable to find exception information"))

        excinfo = req.data.get('excinfo')

        title = self._cw._('an error occured')

        w(u'<h2>%s</h2>' % title)

        if 'errmsg' in req.data:

            ex = req.data['errmsg']

            exclass = None

        else:

            exclass = ex.__class__.__name__

            ex = exc_message(ex, req.encoding)

        if excinfo is not None and self._cw.vreg.config['print-traceback']:

            if exclass is None:

                w(u'<div class="tb">%s</div>'

                       % xml_escape(ex).replace("\n","<br />"))

            else:

                w(u'<div class="tb">%s: %s</div>'

                       % (exclass, xml_escape(ex).replace("\n","<br />")))

            w(u'<hr />')

            w(u'<div class="tb">%s</div>' % html_traceback(excinfo, ex, ''))

        else:

            w(u'<div class="tb">%s</div>' % (xml_escape(ex).replace("\n","<br />")))

        # if excinfo is not None, it's probably not a bug

        if excinfo is None:

            return

        vcconf = self._cw.vreg.config.vc_config()

        w(u"<div>")

        eversion = vcconf.get('cubicweb', self._cw._('no version information'))

        # NOTE: tuple wrapping needed since eversion is itself a tuple

        w(u"<b>CubicWeb version:</b> %s<br/>\n" % (eversion,))

        cversions = []

        for cube in self._cw.vreg.config.cubes():

            cubeversion = vcconf.get(cube, self._cw._('no version information'))

            w(u"<b>Package %s version:</b> %s<br/>\n" % (cube, cubeversion))

            cversions.append((cube, cubeversion))

        w(u"</div>")

        # creates a bug submission link if submit-mail is set

        if self._cw.vreg.config['submit-mail']:

            form = self._cw.vreg['forms'].select('base', self._cw, rset=None,

                                             mainform=False)

            binfo = text_error_description(ex, excinfo, req, eversion, cversions)

            form.add_hidden('description', binfo,

                            # we must use a text area to keep line breaks

                            widget=wdgs.TextArea({'class': 'hidden'}))

            form.add_hidden('__bugreporting', '1')

            form.form_buttons = [wdgs.SubmitButton(MAIL_SUBMIT_MSGID)]

            form.action = req.build_url('reportbug')

            w(form.render())

def exc_message(ex, encoding):

    try:

        return unicode(ex)

    except:

        try:

            return unicode(str(ex), encoding, 'replace')

        except:

            return unicode(repr(ex), encoding, 'replace')

def text_error_description(ex, excinfo, req, eversion, cubes):

    binfo = rest_traceback(excinfo, xml_escape(ex))

    binfo += u'\n\n:URL: %s\n' % req.url()

    if not '__bugreporting' in req.form:

        binfo += u'\n:form params:\n'

        binfo += u'\n'.join(u'  * %s = %s' % (k, v) for k, v in req.form.iteritems())

    binfo += u'\n\n:CubicWeb version: %s\n'  % (eversion,)

    for pkg, pkgversion in cubes:

        binfo += u":Package %s version: %s\n" % (pkg, pkgversion)

    binfo += '\n'

    return binfo

class CwStats(View):

    """A textual stats output for monitoring tools such as munin """

    __regid__ = 'processinfo'

    content_type = 'text/txt'

    templatable = False

    __select__ = none_rset() & match_user_groups('users', 'managers')

    def call(self):

        stats = self._cw.vreg.config.repository(None).stats()

        results = []

        for element in stats:

            results.append(u'%s %s' % (element, stats[element]))

        self.w(u'\n'.join(results))