# --
# Copyright (C) 2001-2019 OTRS AG, https://otrs.com/
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (GPL). If you
# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
# --

package Kernel::System::Web::Request;

use strict;
use warnings;

use CGI ();
use CGI::Carp;
use File::Path qw();

use Kernel::System::VariableCheck qw(:all);

our @ObjectDependencies = (
    'Kernel::Config',
    'Kernel::System::CheckItem',
    'Kernel::System::Encode',
    'Kernel::System::Web::UploadCache',
    'Kernel::System::FormDraft',
    'Kernel::System::Main',
);

=head1 NAME

Kernel::System::Web::Request - global CGI interface

=head1 DESCRIPTION

All cgi param functions.

=head1 PUBLIC INTERFACE

=head2 new()

create param object. Do not use it directly, instead use:

    use Kernel::System::ObjectManager;
    local $Kernel::OM = Kernel::System::ObjectManager->new(
        'Kernel::System::Web::Request' => {
            WebRequest   => CGI::Fast->new(), # optional, e. g. if fast cgi is used
        }
    );
    my $ParamObject = $Kernel::OM->Get('Kernel::System::Web::Request');

If Kernel::System::Web::Request is instantiated several times, they will share the
same CGI data (this can be helpful in filters which do not have access to the
ParamObject, for example.

If you need to reset the CGI data before creating a new instance, use

    CGI::initialize_globals();

before calling Kernel::System::Web::Request->new();

=cut

sub new {
    my ( $Type, %Param ) = @_;

    # allocate new hash for object
    my $Self = {};
    bless( $Self, $Type );

    # get config object
    my $ConfigObject = $Kernel::OM->Get('Kernel::Config');

    # max 5 MB posts
    $CGI::POST_MAX = $ConfigObject->Get('WebMaxFileUpload') || 1024 * 1024 * 5;    ## no critic

    # query object (in case use already existing WebRequest, e. g. fast cgi)
    $Self->{Query} = $Param{WebRequest} || CGI->new();

    return $Self;
}

=head2 Error()

to get the error back

    if ( $ParamObject->Error() ) {
        print STDERR $ParamObject->Error() . "\n";
    }

=cut

sub Error {
    my ( $Self, %Param ) = @_;

    # Workaround, do not check cgi_error() with perlex, CGI module is not
    # working with perlex.
    if ( $ENV{'GATEWAY_INTERFACE'} && $ENV{'GATEWAY_INTERFACE'} =~ /^CGI-PerlEx/ ) {
        return;
    }

    return if !$Self->{Query}->cgi_error();
    ## no critic
    return $Self->{Query}->cgi_error() . ' - POST_MAX=' . ( $CGI::POST_MAX / 1024 ) . 'KB';
    ## use critic
}

=head2 GetParam()

to get single request parameters. By default, trimming is performed on the data.

    my $Param = $ParamObject->GetParam(
        Param => 'ID',
        Raw   => 1,       # optional, input data is not changed
    );

=cut

sub GetParam {
    my ( $Self, %Param ) = @_;

    my $Value = $Self->{Query}->param( $Param{Param} );

    # Fallback to query string for mixed requests.
    my $RequestMethod = $Self->{Query}->request_method() // '';
    if ( $RequestMethod eq 'POST' && !defined $Value ) {
        $Value = $Self->{Query}->url_param( $Param{Param} );
    }

    $Kernel::OM->Get('Kernel::System::Encode')->EncodeInput( \$Value );

    my $Raw = defined $Param{Raw} ? $Param{Raw} : 0;

    if ( !$Raw ) {

        # If it is a plain string, perform trimming
        if ( ref \$Value eq 'SCALAR' ) {
            $Kernel::OM->Get('Kernel::System::CheckItem')->StringClean(
                StringRef => \$Value,
                TrimLeft  => 1,
                TrimRight => 1,
            );
        }
    }

    return $Value;
}

=head2 GetParamNames()

to get names of all parameters passed to the script.

    my @ParamNames = $ParamObject->GetParamNames();

Example:

Called URL: index.pl?Action=AdminSystemConfiguration;Subaction=Save;Name=Config::Option::Valid

    my @ParamNames = $ParamObject->GetParamNames();
    print join " :: ", @ParamNames;
    #prints Action :: Subaction :: Name

=cut

sub GetParamNames {
    my $Self = shift;

    # fetch all names
    my @ParamNames = $Self->{Query}->param();

    # Fallback to query string for mixed requests.
    my $RequestMethod = $Self->{Query}->request_method() // '';
    if ( $RequestMethod eq 'POST' ) {
        my %POSTNames;
        @POSTNames{@ParamNames} = @ParamNames;
        my @GetNames = $Self->{Query}->url_param();
        GETNAME:
        for my $GetName (@GetNames) {
            next GETNAME if !defined $GetName;
            push @ParamNames, $GetName if !exists $POSTNames{$GetName};
        }
    }

    for my $Name (@ParamNames) {
        $Kernel::OM->Get('Kernel::System::Encode')->EncodeInput( \$Name );
    }

    return @ParamNames;
}

=head2 GetArray()

to get array request parameters.
By default, trimming is performed on the data.

    my @Param = $ParamObject->GetArray(
        Param => 'ID',
        Raw   => 1,     # optional, input data is not changed
    );

=cut

sub GetArray {
    my ( $Self, %Param ) = @_;

    my @Values = $Self->{Query}->multi_param( $Param{Param} );

    # Fallback to query string for mixed requests.
    my $RequestMethod = $Self->{Query}->request_method() // '';
    if ( $RequestMethod eq 'POST' && !@Values ) {
        @Values = $Self->{Query}->url_param( $Param{Param} );
    }

    $Kernel::OM->Get('Kernel::System::Encode')->EncodeInput( \@Values );

    my $Raw = defined $Param{Raw} ? $Param{Raw} : 0;

    if ( !$Raw ) {

        # get check item object
        my $CheckItemObject = $Kernel::OM->Get('Kernel::System::CheckItem');

        VALUE:
        for my $Value (@Values) {

            # don't validate CGI::File::Temp objects from file uploads
            next VALUE if !$Value || ref \$Value ne 'SCALAR';

            $CheckItemObject->StringClean(
                StringRef => \$Value,
                TrimLeft  => 1,
                TrimRight => 1,
            );
        }
    }

    return @Values;
}

=head2 GetUploadAll()

gets file upload data.

    my %File = $ParamObject->GetUploadAll(
        Param  => 'FileParam',  # the name of the request parameter containing the file data
    );

    returns (
        Filename    => 'abc.txt',
        ContentType => 'text/plain',
        Content     => 'Some text',
    );

=cut

sub GetUploadAll {
    my ( $Self, %Param ) = @_;

    # get upload
    my $Upload = $Self->{Query}->upload( $Param{Param} );
    return if !$Upload;

    # get real file name
    my $UploadFilenameOrig = $Self->GetParam( Param => $Param{Param} ) || 'unknown';

    my $NewFileName = "$UploadFilenameOrig";    # use "" to get filename of anony. object
    $Kernel::OM->Get('Kernel::System::Encode')->EncodeInput( \$NewFileName );

    # replace all devices like c: or d: and dirs for IE!
    $NewFileName =~ s/.:\\(.*)/$1/g;
    $NewFileName =~ s/.*\\(.+?)/$1/g;

    # return a string
    my $Content = '';
    while (<$Upload>) {
        $Content .= $_;
    }
    close $Upload;

    my $ContentType = $Self->_GetUploadInfo(
        Filename => $UploadFilenameOrig,
        Header   => 'Content-Type',
    );

    return (
        Filename    => $NewFileName,
        Content     => $Content,
        ContentType => $ContentType,
    );
}

sub _GetUploadInfo {
    my ( $Self, %Param ) = @_;

    # get file upload info
    my $FileInfo = $Self->{Query}->uploadInfo( $Param{Filename} );

    # return if no upload info exists
    return 'application/octet-stream' if !$FileInfo;

    # return if no content type of upload info exists
    return 'application/octet-stream' if !$FileInfo->{ $Param{Header} };

    # return content type of upload info
    return $FileInfo->{ $Param{Header} };
}

=head2 SetCookie()

set a cookie

    $ParamObject->SetCookie(
        Key     => ID,
        Value   => 123456,
        Expires => '+3660s',
        Path    => 'otrs/',     # optional, only allow cookie for given path
        Secure  => 1,           # optional, set secure attribute to disable cookie on HTTP (HTTPS only)
        HTTPOnly => 1,          # optional, sets HttpOnly attribute of cookie to prevent access via JavaScript
    );

=cut

sub SetCookie {
    my ( $Self, %Param ) = @_;

    $Param{Path} ||= '';

    return $Self->{Query}->cookie(
        -name     => $Param{Key},
        -value    => $Param{Value},
        -expires  => $Param{Expires},
        -secure   => $Param{Secure} || '',
        -httponly => $Param{HTTPOnly} || '',
        -path     => '/' . $Param{Path},
    );
}

=head2 GetCookie()

get a cookie

    my $String = $ParamObject->GetCookie(
        Key => ID,
    );

=cut

sub GetCookie {
    my ( $Self, %Param ) = @_;

    return $Self->{Query}->cookie( $Param{Key} );
}

=head2 IsAJAXRequest()

checks if the current request was sent by AJAX

    my $IsAJAXRequest = $ParamObject->IsAJAXRequest();

=cut

sub IsAJAXRequest {
    my ( $Self, %Param ) = @_;

    return ( $Self->{Query}->http('X-Requested-With') // '' ) eq 'XMLHttpRequest' ? 1 : 0;
}

=head2 LoadFormDraft()

Load specified draft.
This will read stored draft data and inject it into the param object
for transparent use by frontend module.

    my $FormDraftID = $ParamObject->LoadFormDraft(
        FormDraftID => 123,
        UserID  => 1,
    );

=cut

sub LoadFormDraft {
    my ( $Self, %Param ) = @_;

    return if !$Param{FormDraftID} || !$Param{UserID};

    # get draft data
    my $FormDraft = $Kernel::OM->Get('Kernel::System::FormDraft')->FormDraftGet(
        FormDraftID => $Param{FormDraftID},
        UserID      => $Param{UserID},
    );
    return if !IsHashRefWithData($FormDraft);

    # Verify action.
    my $Action = $Self->GetParam( Param => 'Action' );
    return if $FormDraft->{Action} ne $Action;

    # add draft name to form data
    $FormDraft->{FormData}->{FormDraftTitle} = $FormDraft->{Title};

    # create FormID and add to form data
    my $FormID = $Kernel::OM->Get('Kernel::System::Web::UploadCache')->FormIDCreate();
    $FormDraft->{FormData}->{FormID} = $FormID;

    # set form data to param object, depending on type
    KEY:
    for my $Key ( sort keys %{ $FormDraft->{FormData} } ) {
        my $Value = $FormDraft->{FormData}->{$Key} // '';

        # array value
        if ( IsArrayRefWithData($Value) ) {
            $Self->{Query}->param(
                -name   => $Key,
                -values => $Value,
            );
            next KEY;
        }

        # scalar value
        $Self->{Query}->param(
            -name  => $Key,
            -value => $Value,
        );
    }

    # add UploadCache data
    my $UploadCacheObject = $Kernel::OM->Get('Kernel::System::Web::UploadCache');
    for my $File ( @{ $FormDraft->{FileData} } ) {
        return if !$UploadCacheObject->FormIDAddFile(
            %{$File},
            FormID => $FormID,
        );
    }

    return $Param{FormDraftID};
}

=head2 SaveFormDraft()

Create or replace draft using data from param object and upload cache.
Specified params can be overwritten if necessary.

    my $FormDraftID = $ParamObject->SaveFormDraft(
        UserID         => 1
        ObjectType     => 'Ticket',
        ObjectID       => 123,
        OverrideParams => {               # optional, can contain strings and array references
            Subaction   => undef,
            UserID      => 1,
            CustomParam => [ 1, 2, 3, ],
            ...
        },
    );

=cut

sub SaveFormDraft {
    my ( $Self, %Param ) = @_;

    # check params
    return if !$Param{UserID} || !$Param{ObjectType} || !IsInteger( $Param{ObjectID} );

    # gather necessary data for backend
    my %MetaParams;
    for my $Param (qw(Action FormDraftID FormDraftTitle FormID)) {
        $MetaParams{$Param} = $Self->GetParam(
            Param => $Param,
        );
    }
    return if !$MetaParams{Action};

    # determine session name param (SessionUseCookie = 0) for exclusion
    my $SessionName = $Kernel::OM->Get('Kernel::Config')->Get('SessionName') || 'SessionID';

    # compile override list
    my %OverrideParams = IsHashRefWithData( $Param{OverrideParams} ) ? %{ $Param{OverrideParams} } : ();

    # these params must always be excluded for safety, they take precedence
    for my $Name (
        qw(Action ChallengeToken FormID FormDraftID FormDraftTitle FormDraftAction LoadFormDraftID),
        $SessionName
        )
    {
        $OverrideParams{$Name} = undef;
    }

    # Gather all params.
    #   Exclude, add or override by using OverrideParams if necessary.
    my @ParamNames = $Self->GetParamNames();
    my %ParamSeen;
    my %FormData;
    PARAM:
    for my $Param ( @ParamNames, sort keys %OverrideParams ) {
        next PARAM if $ParamSeen{$Param}++;
        my $Value;

        # check for overrides first
        if ( exists $OverrideParams{$Param} ) {

            # allow only strings and array references as value
            if (
                IsStringWithData( $OverrideParams{$Param} )
                || IsArrayRefWithData( $OverrideParams{$Param} )
                )
            {
                $Value = $OverrideParams{$Param};
            }

            # skip all other parameters (including those specified to be excluded by using 'undef')
            else {
                next PARAM;
            }
        }

        # get other values from param object
        if ( !defined $Value ) {
            my @Values = $Self->GetArray( Param => $Param );
            next PARAM if !IsArrayRefWithData( \@Values );

            # store single occurances as string
            if ( scalar @Values == 1 ) {
                $Value = $Values[0];
            }

            # store multiple occurances as array reference
            else {
                $Value = \@Values;
            }
        }

        $FormData{$Param} = $Value;
    }

    # get files from upload cache
    my @FileData = $Kernel::OM->Get('Kernel::System::Web::UploadCache')->FormIDGetAllFilesData(
        FormID => $MetaParams{FormID},
    );

    # prepare data to add or update draft
    my %FormDraft = (
        FormData    => \%FormData,
        FileData    => \@FileData,
        FormDraftID => $MetaParams{FormDraftID},
        ObjectType  => $Param{ObjectType},
        ObjectID    => $Param{ObjectID},
        Action      => $MetaParams{Action},
        Title       => $MetaParams{FormDraftTitle},
        UserID      => $Param{UserID},
    );

    # update draft
    if ( $MetaParams{FormDraftID} ) {
        return if !$Kernel::OM->Get('Kernel::System::FormDraft')->FormDraftUpdate(%FormDraft);
        return 1;
    }

    # create new draft
    return if !$Kernel::OM->Get('Kernel::System::FormDraft')->FormDraftAdd(%FormDraft);
    return 1;
}

1;

=head1 TERMS AND CONDITIONS

This software is part of the OTRS project (L<https://otrs.org/>).

This software comes with ABSOLUTELY NO WARRANTY. For details, see
the enclosed file COPYING for license information (GPL). If you
did not receive this file, see L<https://www.gnu.org/licenses/gpl-3.0.txt>.

=cut
