# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

package Bugzilla::Config::Common;

use 5.10.1;
use strict;
use warnings;

use Email::Address;
use Socket;

use Bugzilla::Util;
use Bugzilla::Constants;
use Bugzilla::Field;
use Bugzilla::Group;
use Bugzilla::Status;

use base qw(Exporter);
@Bugzilla::Config::Common::EXPORT = qw(
    check_multi check_numeric check_regexp check_url check_group
    check_priority check_severity check_platform
    check_opsys check_shadowdb check_urlbase check_webdotbase
    check_user_verify_class
    check_mail_delivery_method check_notification check_utf8
    check_bug_status check_smtp_auth check_theschwartz_available
    check_maxattachmentsize check_email
    check_comment_taggers_group
    get_all_group_names
);

# Checking functions for the various values

sub check_multi {
    my ( $value, $param ) = (@_);

    if ( $param->{'type'} eq "s" ) {
        unless ( scalar( grep { $_ eq $value } ( @{ $param->{'choices'} } ) ) ) {
            return "Invalid choice '$value' for single-select list param '$param->{'name'}'";
        }

        return "";
    }
    elsif ( $param->{'type'} eq 'm' || $param->{'type'} eq 'o' ) {
        foreach my $chkParam ( split( ',', $value ) ) {
            unless ( scalar( grep { $_ eq $chkParam } ( @{ $param->{'choices'} } ) ) ) {
                return "Invalid choice '$chkParam' for multi-select list param '$param->{'name'}'";
            }
        }

        return "";
    }
    else {
        return "Invalid param type '$param->{'type'}' for check_multi(); " . "contact your Bugzilla administrator";
    }
}

sub check_numeric {
    my ($value) = (@_);
    if ( $value !~ /^[0-9]+$/ ) {
        return "must be a numeric value";
    }
    return "";
}

sub check_regexp {
    my ($value) = (@_);
    eval {qr/$value/};
    return $@;
}

sub check_email {
    my ($value) = @_;
    if ( $value !~ $Email::Address::mailbox ) {
        return "must be a valid email address.";
    }
    return "";
}


sub check_utf8 {
    my $utf8 = shift;

    # You cannot turn off the UTF-8 parameter if you've already converted
    # your tables to utf-8.
    my $dbh = Bugzilla->dbh;
    if ( $dbh->isa('Bugzilla::DB::Mysql') && $dbh->bz_db_is_utf8 && !$utf8 ) {
        return "You cannot disable UTF-8 support, because your MySQL database" . " is encoded in UTF-8";
    }
    return "";
}

sub check_priority {
    my ($value) = (@_);
    my $legal_priorities = get_legal_field_values('priority');
    if ( !grep( $_ eq $value, @$legal_priorities ) ) {
        return "Must be a legal priority value: one of " . join( ", ", @$legal_priorities );
    }
    return "";
}

sub check_severity {
    my ($value) = (@_);
    my $legal_severities = get_legal_field_values('bug_severity');
    if ( !grep( $_ eq $value, @$legal_severities ) ) {
        return "Must be a legal severity value: one of " . join( ", ", @$legal_severities );
    }
    return "";
}

sub check_platform {
    my ($value) = (@_);
    my $legal_platforms = get_legal_field_values('rep_platform');
    if ( !grep( $_ eq $value, '', @$legal_platforms ) ) {
        return "Must be empty or a legal platform value: one of " . join( ", ", @$legal_platforms );
    }
    return "";
}

sub check_opsys {
    my ($value) = (@_);
    my $legal_OS = get_legal_field_values('op_sys');
    if ( !grep( $_ eq $value, '', @$legal_OS ) ) {
        return "Must be empty or a legal operating system value: one of " . join( ", ", @$legal_OS );
    }
    return "";
}

sub check_bug_status {
    my $bug_status = shift;
    my @closed_bug_statuses = map { $_->name } closed_bug_statuses();
    if ( !grep( $_ eq $bug_status, @closed_bug_statuses ) ) {
        return "Must be a valid closed status: one of " . join( ', ', @closed_bug_statuses );
    }
    return "";
}

sub check_group {
    my $group_name = shift;
    return "" unless $group_name;
    my $group = new Bugzilla::Group( { 'name' => $group_name } );
    unless ( defined $group ) {
        return "Must be an existing group name";
    }
    return "";
}

sub check_shadowdb {
    my ($value) = (@_);
    $value = trim($value);
    if ( $value eq "" ) {
        return "";
    }

    if ( !Bugzilla->params->{'shadowdbhost'} ) {
        return "You need to specify a host when using a shadow database";
    }

    # Can't test existence of this because ConnectToDatabase uses the param,
    # but we can't set this before testing....
    # This can really only be fixed after we can use the DBI more openly
    return "";
}

sub check_urlbase {
    my ($url) = (@_);
    if ( $url && $url !~ m:^http.*/$: ) {
        return "must be a legal URL, that starts with http and ends with a slash.";
    }
    return "";
}

sub check_url {
    my ($url) = (@_);
    return '' if $url eq '';    # Allow empty URLs
    if ( $url !~ m:/$: ) {
        return 'must be a legal URL, absolute or relative, ending with a slash.';
    }
    return '';
}

sub check_webdotbase {
    my ($value) = (@_);
    $value = trim($value);
    if ( $value eq "" ) {
        return "";
    }
    if ( $value !~ /^https?:/ ) {
        if ( !-x $value ) {
            return
                "The file path \"$value\" is not a valid executable.  Please specify the complete file path to 'dot' if you intend to generate graphs locally.";
        }

        # Check .htaccess allows access to generated images
        my $webdotdir = bz_locations()->{'webdotdir'};
        if ( -e "$webdotdir/.htaccess" ) {
            open HTACCESS, "<", "$webdotdir/.htaccess";
            if ( !grep( / \\\.png\$/, <HTACCESS> ) ) {
                return
                    "Dependency graph images are not accessible.\nAssuming that you have not modified the file, delete $webdotdir/.htaccess and re-run checksetup.pl to rectify.\n";
            }
            close HTACCESS;
        }
    }
    return "";
}

sub check_user_verify_class {

    # doeditparams traverses the list of params, and for each one it checks,
    # then updates. This means that if one param checker wants to look at
    # other params, it must be below that other one. So you can't have two
    # params mutually dependent on each other.
    # This means that if someone clears the LDAP config params after setting
    # the login method as LDAP, we won't notice, but all logins will fail.
    # So don't do that.

    my $params = Bugzilla->params;
    my ( $list, $entry ) = @_;
    $list || return 'You need to specify at least one authentication mechanism';
    for my $class ( split /,\s*/, $list ) {
        my $res = check_multi( $class, $entry );
        return $res if $res;
        if ( $class eq 'RADIUS' ) {
            if ( !Bugzilla->feature('auth_radius') ) {
                return "RADIUS support is not available. Run checksetup.pl" . " for more details";
            }
            return "RADIUS servername (RADIUS_server) is missing"
                if !$params->{"RADIUS_server"};
            return "RADIUS_secret is empty" if !$params->{"RADIUS_secret"};
        }
        elsif ( $class eq 'LDAP' ) {
            if ( !Bugzilla->feature('auth_ldap') ) {
                return "LDAP support is not available. Run checksetup.pl" . " for more details";
            }
            return "LDAP servername (LDAPserver) is missing"
                if !$params->{"LDAPserver"};
            return "LDAPBaseDN is empty" if !$params->{"LDAPBaseDN"};
        }
    }
    return "";
}

sub check_mail_delivery_method {
    my $check = check_multi(@_);
    return $check if $check;
    my $mailer = shift;
    if ( $mailer eq 'sendmail' and ON_WINDOWS ) {

        # look for sendmail.exe
        return "Failed to locate " . SENDMAIL_EXE
            unless -e SENDMAIL_EXE;
    }
    return "";
}

sub check_maxattachmentsize {
    my $check = check_numeric(@_);
    return $check if $check;
    my $size = shift;
    my $dbh  = Bugzilla->dbh;
    if ( $dbh->isa('Bugzilla::DB::Mysql') ) {
        my ( undef, $max_packet ) = $dbh->selectrow_array(q{SHOW VARIABLES LIKE 'max\_allowed\_packet'});
        my $byte_size = $size * 1024;
        if ( $max_packet < $byte_size ) {
            return
                  "You asked for a maxattachmentsize of $byte_size bytes,"
                . " but the max_allowed_packet setting in MySQL currently"
                . " only allows packets up to $max_packet bytes";
        }
    }
    return "";
}

sub check_notification {
    my $option          = shift;
    my @current_version = ( BUGZILLA_VERSION =~ m/^(\d+)\.(\d+)(?:(rc|\.)(\d+))?\+?$/ );
    if ( $current_version[1] % 2 && $option eq 'stable_branch_release' ) {
        return
              "You are currently running a development snapshot, and so your "
            . "installation is not based on a branch. If you want to be notified "
            . "about the next stable release, you should select "
            . "'latest_stable_release' instead";
    }
    if ( $option ne 'disabled' && !Bugzilla->feature('updates') ) {
        return "Some Perl modules are missing to get notifications about "
            . "new releases. See the output of checksetup.pl for more information";
    }
    return "";
}

sub check_smtp_auth {
    my $username = shift;
    if ( $username and !Bugzilla->feature('smtp_auth') ) {
        return "SMTP Authentication is not available. Run checksetup.pl for" . " more details";
    }
    return "";
}

sub check_theschwartz_available {
    my $use_queue = shift;
    if ( $use_queue && !Bugzilla->feature('jobqueue') ) {
        return
              "Using the job queue requires that you have certain Perl"
            . " modules installed. See the output of checksetup.pl"
            . " for more information";
    }
    return "";
}

sub check_comment_taggers_group {
    my $group_name = shift;
    if ( $group_name && !Bugzilla->feature('jsonrpc') ) {
        return "Comment tagging requires installation of the JSONRPC feature";
    }
    return check_group($group_name);
}

sub get_all_group_names {
    return [
        '',
        map { $_->name } Bugzilla::Group->get_all,
    ];
}

# OK, here are the parameter definitions themselves.
#
# Each definition is a hash with keys:
#
# name    - name of the param
# desc    - description of the param (for editparams.cgi)
# type    - see below
# choices - (optional) see below
# default - default value for the param
# checker - (optional) checking function for validating parameter entry
#           It is called with the value of the param as the first arg and a
#           reference to the param's hash as the second argument
#
# The type value can be one of the following:
#
# t -- A short text entry field (suitable for a single line)
# p -- A short text entry field (as with type = 't'), but the string is
#      replaced by asterisks (appropriate for passwords)
# l -- A long text field (suitable for many lines)
# b -- A boolean value (either 1 or 0)
# m -- A list of values, with many selectable (shows up as a select box)
#      To specify the list of values, make the 'choices' key be an array
#      reference of the valid choices. The 'default' key should be a string
#      with a list of selected values (as a comma-separated list), i.e.:
#       {
#         name => 'multiselect',
#         desc => 'A list of options, choose many',
#         type => 'm',
#         choices => [ 'a', 'b', 'c', 'd' ],
#         default => [ 'a', 'd' ],
#         checker => \&check_multi
#       }
#
#      Here, 'a' and 'd' are the default options, and the user may pick any
#      combination of a, b, c, and d as valid options.
#
#      &check_multi should always be used as the param verification function
#      for list (single and multiple) parameter types.
#
# o -- A list of values, orderable, and with many selectable (shows up as a
#      JavaScript-enhanced select box if JavaScript is enabled, and a text
#      entry field if not)
#      Set up in the same way as type m.
#
# s -- A list of values, with one selectable (shows up as a select box)
#      To specify the list of values, make the 'choices' key be an array
#      reference of the valid choices. The 'default' key should be one of
#      those values, i.e.:
#       {
#         name => 'singleselect',
#         desc => 'A list of options, choose one',
#         type => 's',
#         choices => [ 'a', 'b', 'c' ],
#         default => 'b',
#         checker => \&check_multi
#       }
#
#      Here, 'b' is the default option, and 'a' and 'c' are other possible
#      options, but only one at a time!
#
#      &check_multi should always be used as the param verification function
#      for list (single and multiple) parameter types.

sub get_param_list {
    return;
}

1;

__END__

=head1 NAME

Bugzilla::Config::Common - Parameter checking functions

=head1 DESCRIPTION

All parameter checking functions are called with two parameters: the value to
check, and a hash with the details of the param (type, default etc.) as defined
in the relevant F<Bugzilla::Config::*> package.

=head2 Functions

=over

=item C<check_multi>

Checks that a multi-valued parameter (ie types C<s>, C<o> or C<m>) satisfies
its contraints.

=item C<check_numeric>

Checks that the value is a valid number

=item C<check_regexp>

Checks that the value is a valid regexp

=item C<check_comment_taggers_group>

Checks that the required modules for comment tagging are installed, and that a
valid group is provided.

=back