#!/usr/bin/env perl -wT
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Dave Miller <justdave@syndicomm.com>
#                 Joel Peshkin <bugreport@peshkin.net>
#                 Jacob Steenhagen <jake@bugzilla.org>
#                 Vlad Dascalu <jocuri@softhome.net>
#                 Frédéric Buclin <LpSolit@gmail.com>

use strict;
use lib qw(. lib);

use Bugzilla;
use Bugzilla::Constants;
use Bugzilla::Config qw(:admin);
use Bugzilla::Util;
use Bugzilla::Error;
use Bugzilla::Group;
use Bugzilla::Product;
use Bugzilla::User;
use Bugzilla::Token;

use constant SPECIAL_GROUPS => ('chartgroup', 'insidergroup',
                                'timetrackinggroup', 'querysharegroup');

my $cgi = Bugzilla->cgi;
my $dbh = Bugzilla->dbh;
my $template = Bugzilla->template;
my $vars = {};

my $user = Bugzilla->login(LOGIN_REQUIRED);

print $cgi->header();

$user->in_group('creategroups')
  || ThrowUserError("auth_failure", {group  => "creategroups",
                                     action => "edit",
                                     object => "groups"});

my $action = trim($cgi->param('action') || '');
my $token  = $cgi->param('token');

# CheckGroupID checks that a positive integer is given and is
# actually a valid group ID. If all tests are successful, the
# trimmed group ID is returned.

sub CheckGroupID {
    my ($group_id) = @_;
    $group_id = trim($group_id || 0);
    ThrowUserError("group_not_specified") unless $group_id;
    (detaint_natural($group_id)
      && Bugzilla->dbh->selectrow_array("SELECT id FROM groups WHERE id = ?",
                                        undef, $group_id))
      || ThrowUserError("invalid_group_ID");
    return $group_id;
}

# This subroutine is called when:
# - a new group is created. CheckGroupName checks that its name
#   is not empty and is not already used by any existing group.
# - an existing group is edited. CheckGroupName checks that its
#   name has not been deleted or renamed to another existing
#   group name (whose group ID is different from $group_id).
# In both cases, an error message is returned to the user if any
# test fails! Else, the trimmed group name is returned.

sub CheckGroupName {
    my ($name, $group_id) = @_;
    $name = trim($name || '');
    trick_taint($name);
    ThrowUserError("empty_group_name") unless $name;
    my $excludeself = (defined $group_id) ? " AND id != $group_id" : "";
    my $name_exists = Bugzilla->dbh->selectrow_array("SELECT name FROM groups " .
                                                     "WHERE name = ? $excludeself",
                                                     undef, $name);
    if ($name_exists) {
        ThrowUserError("group_exists", { name => $name });
    }
    return $name;
}

# CheckGroupDesc checks that a non empty description is given. The
# trimmed description is returned.

sub CheckGroupDesc {
    my ($desc) = @_;
    $desc = trim($desc || '');
    trick_taint($desc);
    ThrowUserError("empty_group_description") unless $desc;
    return $desc;
}

# CheckGroupRegexp checks that the regular expression is valid
# (the regular expression being optional, the test is successful
# if none is given, as expected). The trimmed regular expression
# is returned.

sub CheckGroupRegexp {
    my ($regexp) = @_;
    $regexp = trim($regexp || '');
    trick_taint($regexp);
    ThrowUserError("invalid_regexp") unless (eval {qr/$regexp/});
    return $regexp;
}

# A helper for displaying the edit.html.tmpl template.
sub get_current_and_available {
    my ($group, $vars) = @_;

    my @all_groups         = Bugzilla::Group->get_all;
    my @members_current    = @{$group->grant_direct(GROUP_MEMBERSHIP)};
    my @member_of_current  = @{$group->granted_by_direct(GROUP_MEMBERSHIP)};
    my @bless_from_current = @{$group->grant_direct(GROUP_BLESS)};
    my @bless_to_current   = @{$group->granted_by_direct(GROUP_BLESS)};
    my (@visible_from_current, @visible_to_me_current);
    if (Bugzilla->params->{'usevisibilitygroups'}) {
        @visible_from_current  = @{$group->grant_direct(GROUP_VISIBLE)};
        @visible_to_me_current = @{$group->granted_by_direct(GROUP_VISIBLE)};
    }

    # Figure out what groups are not currently a member of this group,
    # and what groups this group is not currently a member of.
    my (@members_available, @member_of_available,
        @bless_from_available, @bless_to_available,
        @visible_from_available, @visible_to_me_available);
    foreach my $group_option (@all_groups) {
        if (Bugzilla->params->{'usevisibilitygroups'}) {
            push(@visible_from_available, $group_option)
                if !grep($_->id == $group_option->id, @visible_from_current);
            push(@visible_to_me_available, $group_option)
                if !grep($_->id == $group_option->id, @visible_to_me_current);
        }

        # The group itself should never show up in the bless or 
        # membership lists.
        next if $group_option->id == $group->id;

        push(@members_available, $group_option)
            if !grep($_->id == $group_option->id, @members_current);
        push(@member_of_available, $group_option)
            if !grep($_->id == $group_option->id, @member_of_current);
        push(@bless_from_available, $group_option)
            if !grep($_->id == $group_option->id, @bless_from_current);
        push(@bless_to_available, $group_option)
           if !grep($_->id == $group_option->id, @bless_to_current);
    }

    $vars->{'members_current'}     = \@members_current;
    $vars->{'members_available'}   = \@members_available;
    $vars->{'member_of_current'}   = \@member_of_current;
    $vars->{'member_of_available'} = \@member_of_available;

    $vars->{'bless_from_current'}   = \@bless_from_current;
    $vars->{'bless_from_available'} = \@bless_from_available;
    $vars->{'bless_to_current'}     = \@bless_to_current;
    $vars->{'bless_to_available'}   = \@bless_to_available;

    if (Bugzilla->params->{'usevisibilitygroups'}) {
        $vars->{'visible_from_current'}    = \@visible_from_current;
        $vars->{'visible_from_available'}  = \@visible_from_available;
        $vars->{'visible_to_me_current'}   = \@visible_to_me_current;
        $vars->{'visible_to_me_available'} = \@visible_to_me_available;
    }
}

# If no action is specified, get a list of all groups available.

unless ($action) {
    my @groups = Bugzilla::Group->get_all;
    $vars->{'groups'} = \@groups;
    
    print $cgi->header();
    $template->process("admin/groups/list.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    exit;
}

#
# action='changeform' -> present form for altering an existing group
#
# (next action will be 'postchanges')
#

if ($action eq 'changeform') {
    # Check that an existing group ID is given
    my $group_id = CheckGroupID($cgi->param('group'));
    my $group = new Bugzilla::Group($group_id);

    get_current_and_available($group, $vars);
    $vars->{'group'} = $group;
    $vars->{'token'}       = issue_session_token('edit_group');

    print $cgi->header();
    $template->process("admin/groups/edit.html.tmpl", $vars)
      || ThrowTemplateError($template->error());

    exit;
}

#
# action='add' -> present form for parameters for new group
#
# (next action will be 'new')
#

if ($action eq 'add') {
    $vars->{'token'} = issue_session_token('add_group');
    print $cgi->header();
    $template->process("admin/groups/create.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    
    exit;
}


#
# action='new' -> add group entered in the 'action=add' screen
#

if ($action eq 'new') {
    check_token_data($token, 'add_group');
    # Check that a not already used group name is given, that
    # a description is also given and check if the regular
    # expression is valid (if any).
    my $name = CheckGroupName($cgi->param('name'));
    my $desc = CheckGroupDesc($cgi->param('desc'));
    my $regexp = CheckGroupRegexp($cgi->param('regexp'));
    my $isactive = $cgi->param('isactive') ? 1 : 0;
    # This is an admin page. The URL is considered safe.
    my $icon_url;
    if ($cgi->param('icon_url')) {
        $icon_url = clean_text($cgi->param('icon_url'));
        trick_taint($icon_url);
    }

    # Add the new group
    $dbh->do('INSERT INTO groups
              (name, description, isbuggroup, userregexp, isactive, icon_url)
              VALUES (?, ?, 1, ?, ?, ?)',
              undef, ($name, $desc, $regexp, $isactive, $icon_url));

    my $group = new Bugzilla::Group({name => $name});
    my $admin = Bugzilla::Group->new({name => 'admin'})->id();
    # Since we created a new group, give the "admin" group all privileges
    # initially.
    my $sth = $dbh->prepare('INSERT INTO group_group_map
                             (member_id, grantor_id, grant_type)
                             VALUES (?, ?, ?)');

    $sth->execute($admin, $group->id, GROUP_MEMBERSHIP);
    $sth->execute($admin, $group->id, GROUP_BLESS);
    $sth->execute($admin, $group->id, GROUP_VISIBLE);

    # Permit all existing products to use the new group if makeproductgroups.
    if ($cgi->param('insertnew')) {
        $dbh->do('INSERT INTO group_control_map
                  (group_id, product_id, entry, membercontrol,
                   othercontrol, canedit)
                  SELECT ?, products.id, 0, ?, ?, 0 FROM products',
                  undef, ($group->id, CONTROLMAPSHOWN, CONTROLMAPNA));
    }
    Bugzilla::Group::RederiveRegexp($regexp, $group->id);
    delete_token($token);

    $vars->{'message'} = 'group_created';
    $vars->{'group'} = $group;
    get_current_and_available($group, $vars);
    $vars->{'token'} = issue_session_token('edit_group');

    print $cgi->header();
    $template->process("admin/groups/edit.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    exit;
}

#
# action='del' -> ask if user really wants to delete
#
# (next action would be 'delete')
#

if ($action eq 'del') {
    # Check that an existing group ID is given
    my $gid = CheckGroupID($cgi->param('group'));
    my ($name, $desc, $isbuggroup) =
        $dbh->selectrow_array("SELECT name, description, isbuggroup " .
                              "FROM groups WHERE id = ?", undef, $gid);

    # System groups cannot be deleted!
    if (!$isbuggroup) {
        ThrowUserError("system_group_not_deletable", { name => $name });
    }
    # Groups having a special role cannot be deleted.
    my @special_groups;
    foreach my $special_group (SPECIAL_GROUPS) {
        if ($name eq Bugzilla->params->{$special_group}) {
            push(@special_groups, $special_group);
        }
    }
    if (scalar(@special_groups)) {
        ThrowUserError('group_has_special_role', {'name'  => $name,
                                                  'groups' => \@special_groups});
    }

    # Group inheritance no longer appears in user_group_map.
    my $grouplist = join(',', @{Bugzilla::User->flatten_group_membership($gid)});
    my $hasusers =
        $dbh->selectrow_array("SELECT 1 FROM user_group_map
                               WHERE group_id IN ($grouplist) AND isbless = 0 " .
                               $dbh->sql_limit(1)) || 0;

    my ($shared_queries) =
        $dbh->selectrow_array('SELECT COUNT(*)
                                 FROM namedquery_group_map
                                WHERE group_id = ?',
                              undef, $gid);

    my $bug_ids = $dbh->selectcol_arrayref('SELECT bug_id FROM bug_group_map
                                            WHERE group_id = ?', undef, $gid);

    my $hasbugs = scalar(@$bug_ids) ? 1 : 0;
    my $buglist = join(',', @$bug_ids);

    my $hasproduct = Bugzilla::Product->new({'name' => $name}) ? 1 : 0;

    my $hasflags = $dbh->selectrow_array('SELECT 1 FROM flagtypes 
                                           WHERE grant_group_id = ?
                                              OR request_group_id = ? ' .
                                          $dbh->sql_limit(1),
                                          undef, ($gid, $gid)) || 0;

    $vars->{'gid'}            = $gid;
    $vars->{'name'}           = $name;
    $vars->{'description'}    = $desc;
    $vars->{'hasusers'}       = $hasusers;
    $vars->{'hasbugs'}        = $hasbugs;
    $vars->{'hasproduct'}     = $hasproduct;
    $vars->{'hasflags'}       = $hasflags;
    $vars->{'shared_queries'} = $shared_queries;
    $vars->{'buglist'}        = $buglist;
    $vars->{'token'}          = issue_session_token('delete_group');

    print $cgi->header();
    $template->process("admin/groups/delete.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    
    exit;
}

#
# action='delete' -> really delete the group
#

if ($action eq 'delete') {
    check_token_data($token, 'delete_group');
    # Check that an existing group ID is given
    my $gid = CheckGroupID($cgi->param('group'));
    my ($name, $isbuggroup) =
        $dbh->selectrow_array("SELECT name, isbuggroup FROM groups " .
                              "WHERE id = ?", undef, $gid);

    # System groups cannot be deleted!
    if (!$isbuggroup) {
        ThrowUserError("system_group_not_deletable", { name => $name });
    }
    # Groups having a special role cannot be deleted.
    my @special_groups;
    foreach my $special_group (SPECIAL_GROUPS) {
        if ($name eq Bugzilla->params->{$special_group}) {
            push(@special_groups, $special_group);
        }
    }
    if (scalar(@special_groups)) {
        ThrowUserError('group_has_special_role', {'name'  => $name,
                                                  'groups' => \@special_groups});
    }

    my $cantdelete = 0;

    # Group inheritance no longer appears in user_group_map.
    my $grouplist = join(',', @{Bugzilla::User->flatten_group_membership($gid)});
    my $hasusers =
        $dbh->selectrow_array("SELECT 1 FROM user_group_map
                               WHERE group_id IN ($grouplist) AND isbless = 0 " .
                               $dbh->sql_limit(1)) || 0;

    if ($hasusers && !defined $cgi->param('removeusers')) {
        $cantdelete = 1;
    }

    my $hasbugs = $dbh->selectrow_array('SELECT 1 FROM bug_group_map
                                         WHERE group_id = ? ' .
                                         $dbh->sql_limit(1),
                                         undef, $gid) || 0;
    if ($hasbugs && !defined $cgi->param('removebugs')) {
        $cantdelete = 1;
    }

    if (Bugzilla::Product->new({'name' => $name})
        && !defined $cgi->param('unbind'))
    {
        $cantdelete = 1;
    }

    my $hasflags = $dbh->selectrow_array('SELECT 1 FROM flagtypes 
                                           WHERE grant_group_id = ?
                                              OR request_group_id = ? ' .
                                          $dbh->sql_limit(1),
                                          undef, ($gid, $gid)) || 0;
    if ($hasflags && !defined $cgi->param('removeflags')) {
        $cantdelete = 1;
    }

    $vars->{'gid'}        = $gid;
    $vars->{'name'}       = $name;

    ThrowUserError('group_cannot_delete', $vars) if $cantdelete;

    $dbh->do('UPDATE flagtypes SET grant_group_id = ?
               WHERE grant_group_id = ?',
              undef, (undef, $gid));
    $dbh->do('UPDATE flagtypes SET request_group_id = ?
               WHERE request_group_id = ?',
              undef, (undef, $gid));
    $dbh->do('DELETE FROM namedquery_group_map WHERE group_id = ?',
              undef, $gid);
    $dbh->do('DELETE FROM user_group_map WHERE group_id = ?',
              undef, $gid);
    $dbh->do('DELETE FROM group_group_map 
               WHERE grantor_id = ? OR member_id = ?',
              undef, ($gid, $gid));
    $dbh->do('DELETE FROM bug_group_map WHERE group_id = ?',
              undef, $gid);
    $dbh->do('DELETE FROM group_control_map WHERE group_id = ?',
              undef, $gid);
    $dbh->do('DELETE FROM whine_schedules
               WHERE mailto_type = ? AND mailto = ?',
              undef, (MAILTO_GROUP, $gid));
    $dbh->do('DELETE FROM groups WHERE id = ?',
              undef, $gid);

    delete_token($token);

    $vars->{'message'} = 'group_deleted';
    $vars->{'groups'} = [Bugzilla::Group->get_all];

    print $cgi->header();
    $template->process("admin/groups/list.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    exit;
}

#
# action='postchanges' -> update the groups
#

if ($action eq 'postchanges') {
    check_token_data($token, 'edit_group');
    my $changes = doGroupChanges();
    delete_token($token);

    my $group = new Bugzilla::Group($cgi->param('group_id'));
    get_current_and_available($group, $vars);
    $vars->{'message'} = 'group_updated';
    $vars->{'group'}   = $group;
    $vars->{'changes'} = $changes;
    $vars->{'token'} = issue_session_token('edit_group');

    print $cgi->header();
    $template->process("admin/groups/edit.html.tmpl", $vars)
      || ThrowTemplateError($template->error());
    exit;
}

if ($action eq 'confirm_remove') {
    my $group = new Bugzilla::Group(CheckGroupID($cgi->param('group_id')));
    $vars->{'group'} = $group;
    $vars->{'regexp'} = CheckGroupRegexp($cgi->param('regexp'));
    $vars->{'token'} = issue_session_token('remove_group_members');
    $template->process('admin/groups/confirm-remove.html.tmpl', $vars)
        || ThrowTemplateError($template->error());
    exit;
}

if ($action eq 'remove_regexp') {
    check_token_data($token, 'remove_group_members');
    # remove all explicit users from the group with
    # gid = $cgi->param('group') that match the regular expression
    # stored in the DB for that group or all of them period

    my $group  = new Bugzilla::Group(CheckGroupID($cgi->param('group_id')));
    my $regexp = CheckGroupRegexp($cgi->param('regexp'));

    $dbh->bz_start_transaction();

    my $users = $group->members_direct();
    my $sth_delete = $dbh->prepare(
        "DELETE FROM user_group_map
           WHERE user_id = ? AND isbless = 0 AND group_id = ?");

    my @deleted;
    foreach my $member (@$users) {
        if ($regexp eq '' || $member->login =~ m/$regexp/i) {
            $sth_delete->execute($member->id, $group->id);
            push(@deleted, $member);
        }
    }
    $dbh->bz_commit_transaction();

    $vars->{'users'}  = \@deleted;
    $vars->{'regexp'} = $regexp;
    delete_token($token);

    $vars->{'message'} = 'group_membership_removed';
    $vars->{'group'} = $group->name;
    $vars->{'groups'} = [Bugzilla::Group->get_all];

    print $cgi->header();
    $template->process("admin/groups/list.html.tmpl", $vars)
      || ThrowTemplateError($template->error());

    exit;
}


#
# No valid action found
#

ThrowCodeError("action_unrecognized", $vars);


# Helper sub to handle the making of changes to a group
sub doGroupChanges {
    my $cgi = Bugzilla->cgi;
    my $dbh = Bugzilla->dbh;

    $dbh->bz_start_transaction();

    # Check that the given group ID is valid and make a Group.
    my $group = new Bugzilla::Group(CheckGroupID($cgi->param('group_id')));

    if (defined $cgi->param('regexp')) {
        $group->set_user_regexp($cgi->param('regexp'));
    }

    if ($group->is_bug_group) {
        if (defined $cgi->param('name')) {
            $group->set_name($cgi->param('name'));
        }
        if (defined $cgi->param('desc')) {
            $group->set_description($cgi->param('desc'));
        }
        # Only set isactive if we came from the right form.
        if (defined $cgi->param('regexp')) {
            $group->set_is_active($cgi->param('isactive'));
        }
    }

    if (defined $cgi->param('icon_url')) {
        $group->set_icon_url($cgi->param('icon_url'));
    }

    my $changes = $group->update();

    my $sth_insert = $dbh->prepare('INSERT INTO group_group_map
                                    (member_id, grantor_id, grant_type)
                                    VALUES (?, ?, ?)');

    my $sth_delete = $dbh->prepare('DELETE FROM group_group_map
                                     WHERE member_id = ?
                                           AND grantor_id = ?
                                           AND grant_type = ?');

    # First item is the type, second is whether or not it's "reverse" 
    # (granted_by) (see _do_add for more explanation).
    my %fields = (
        members       => [GROUP_MEMBERSHIP, 0],
        bless_from    => [GROUP_BLESS, 0],
        visible_from  => [GROUP_VISIBLE, 0],
        member_of     => [GROUP_MEMBERSHIP, 1],
        bless_to      => [GROUP_BLESS, 1],
        visible_to_me => [GROUP_VISIBLE, 1]
    );
    while (my ($field, $data) = each %fields) {
        _do_add($group, $changes, $sth_insert, "${field}_add", 
                $data->[0], $data->[1]);
        _do_remove($group, $changes, $sth_delete, "${field}_remove",
                   $data->[0], $data->[1]);
    }

    $dbh->bz_commit_transaction();
    return $changes;
}

sub _do_add {
    my ($group, $changes, $sth_insert, $field, $type, $reverse) = @_;
    my $cgi = Bugzilla->cgi;

    my $current;
    # $reverse means we're doing a granted_by--that is, somebody else
    # is granting us something.
    if ($reverse) {
        $current = $group->granted_by_direct($type);
    }
    else {
        $current = $group->grant_direct($type);
    }

    my $add_items = Bugzilla::Group->new_from_list([$cgi->param($field)]);

    foreach my $add (@$add_items) {
        next if grep($_->id == $add->id, @$current);

        $changes->{$field} ||= [];
        push(@{$changes->{$field}}, $add->name);
        # They go this direction for a normal "This group is granting
        # $add something."
        my @ids = ($add->id, $group->id);
        # But they get reversed for "This group is being granted something
        # by $add."
        @ids = reverse @ids if $reverse;
        $sth_insert->execute(@ids, $type);
    }
}

sub _do_remove {
    my ($group, $changes, $sth_delete, $field, $type, $reverse) = @_;
    my $cgi = Bugzilla->cgi;
    my $remove_items = Bugzilla::Group->new_from_list([$cgi->param($field)]);

    foreach my $remove (@$remove_items) {
        my @ids = ($remove->id, $group->id);
        # See _do_add for an explanation of $reverse
        @ids = reverse @ids if $reverse;
        # Deletions always succeed and are harmless if they fail, so we
        # don't need to do any checks.
        $sth_delete->execute(@ids, $type);
        $changes->{$field} ||= [];
        push(@{$changes->{$field}}, $remove->name);
    }
}