#!/usr/bin/perl
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use strict;
use warnings;
no warnings 'once';

# fix lib paths, some may be relative
BEGIN { # BEGIN RT CMD BOILERPLATE
    require File::Spec;
    require Cwd;
    my @libs = ("/usr/local/libdata/perl5/site_perl", "/usr/local/libdata/perl5/site_perl");
    my $bin_path;

    for my $lib (@libs) {
        unless ( File::Spec->file_name_is_absolute($lib) ) {
            $bin_path ||= ( File::Spec->splitpath(Cwd::abs_path(__FILE__)) )[1];
            $lib = File::Spec->catfile( $bin_path, File::Spec->updir, $lib );
        }
        unshift @INC, $lib;
    }

}

BEGIN {
    use RT;
    RT::LoadConfig();
    RT::Init();
};
use RT::Interface::CLI ();

my %DB = (
    type           => scalar RT->Config->Get('DatabaseType'),
    user           => scalar RT->Config->Get('DatabaseUser'),
    admin          => scalar RT->Config->Get('DatabaseAdmin'),
    admin_password => undef,
);

my %OPT = (
    help        => 0,
    ask         => 1,
    dryrun      => 0,
    attachments => 1,
);

my %DEFAULT;
if ( $DB{'type'} eq 'Pg' ) {
    %DEFAULT = (
        table  => 'AttachmentsIndex',
        column => 'ContentIndex',
    );
}
elsif ( $DB{'type'} eq 'mysql' ) {
    %DEFAULT = (
        table => 'AttachmentsIndex',
    );
}
elsif ( $DB{'type'} eq 'Oracle' ) {
    %DEFAULT = (
        prefix => 'rt_fts_',
    );
}

use Getopt::Long qw(GetOptions);
GetOptions(
    'h|help!'        => \$OPT{'help'},
    'ask!'           => \$OPT{'ask'},
    'dry-run!'       => \$OPT{'dryrun'},
    'attachments!'   => \$OPT{'attachments'},

    'table=s'        => \$OPT{'table'},
    'column=s'       => \$OPT{'column'},
    'url=s'          => \$OPT{'url'},
    'maxmatches=i'   => \$OPT{'maxmatches'},
    'index-type=s'   => \$OPT{'index-type'},

    'dba=s'          => \$DB{'admin'},
    'dba-password=s' => \$DB{'admin_password'},
    'limit=i'        => \$DB{'batch-size'},
) or show_help();

if ( $OPT{'help'} || (!$DB{'admin'} && $DB{'type'} eq 'Oracle' ) ) {
    show_help( !$OPT{'help'} );
}

my $dbh = $RT::Handle->dbh;
$dbh->{'RaiseError'} = 1;
$dbh->{'PrintError'} = 1;

# MySQL could either be native of sphinx; find out which
if ($DB{'type'} eq "mysql") {
    my $index_type = lc($OPT{'index-type'} || '');

    # Default to sphinx on < 5.6, and error if they provided mysql
    my $msg;
    if ($RT::Handle->dbh->{mysql_serverversion} < 50600) {
        $msg = "Complete support for full-text search requires MySQL 5.6 or higher.  For prior\n"
              ."versions such as yours, full-text indexing can either be provided using MyISAM\n"
              ."tables, or the external Sphinx indexer.  Using MyISAM tables requires that your\n"
              ."database be tuned to support them, as RT uses InnoDB tables for all other content.\n"
              ."Using Sphinx will require recompiling MySQL.  Which indexing solution would you\n"
              ."prefer?"
    } else {
        $msg = "MySQL 5.6 and above, and MariaDB 10.0 and above, support native full-text indexing.\n"
              ."For compatibility with earlier versions of RT, the external Sphinx indexer is\n"
              ."still supported only on MySQL. Select 'mysql' indexing if you are using MariaDB.\n"
              ."\n"
              ."Which indexing solution would you prefer? {mysql|sphinx}"
    }

    while ( $index_type ne 'sphinx' and $index_type ne 'mysql' ) {
        $index_type = lc prompt(
            message => $msg,
            default => 'mysql',
            silent  => !$OPT{'ask'},
        );
    };
    $DB{'type'} = $index_type;
}

if ( $DB{'type'} eq 'mysql' ) {
    # MySQL 5.6 has FTS on InnoDB "text" columns -- which the
    # Attachments table doesn't have, but we can make it have.
    my $table = $OPT{'table'} || prompt(
        message => "Enter the name of a new table that will be used to store the\n"
                 . "full-text content and indexes:",
        default => $DEFAULT{'table'},
        silent  => !$OPT{'ask'},
    );
    do_error_is_ok( dba_handle() => "DROP TABLE $table" )
        unless $OPT{'dryrun'};

    my $engine = $RT::Handle->dbh->{mysql_serverversion} < 50600 ? "MyISAM" : "InnoDB";
    my $schema = "CREATE TABLE $table ( "
        ."id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,"
        ."Content LONGTEXT ) ENGINE=$engine CHARACTER SET utf8";
    insert_schema( $schema );

    insert_data( Table => $table, Engine => $engine );

    insert_schema( "CREATE FULLTEXT INDEX $table ON $table(Content)" );

    print_rt_config( Table => $table );
} elsif ($DB{'type'} eq 'sphinx') {
    check_sphinx();
    my $table = $OPT{'table'} || prompt(
        message => "Enter name of a new MySQL table that will be used to connect to the\n"
                 . "Sphinx server:",
        default => $DEFAULT{'table'},
        silent  => !$OPT{'ask'},
    );

    my $url = 'sphinx://localhost:3312/rt';
    my $version = ($dbh->selectrow_array("show variables like 'version'"))[1];
    $url = 'sphinx://127.0.0.1:3312/rt'
        if $version and $version =~ /^(\d+\.\d+)/ and $1 >= 5.5;

    $url = $OPT{'url'} || prompt(
        message => "Enter URL of the sphinx search server; this should be of the form\n"
                 . "sphinx://<server>:<port>/<index name>",
        default => $url,
        silent  => !$OPT{'ask'},
    );
    my $maxmatches = $OPT{'maxmatches'} || prompt(
        message => "Maximum number of matches to return; this is the maximum number of\n"
                 . "attachment records returned by the search, not the maximum number\n"
                 . "of tickets.  Both your RT_SiteConfig.pm and your sphinx.conf must\n"
                 . "agree on this value.  Larger values cause your Sphinx server to\n"
                 . "consume more memory and CPU time per query.",
        default => 10000,
        silent  => !$OPT{'ask'},
    );

    my $schema = <<END;
CREATE TABLE $table (
    id     BIGINT NOT NULL,
    weight INTEGER NOT NULL,
    query  VARCHAR(3072) NOT NULL,
    INDEX(query)
) ENGINE=SPHINX CONNECTION="$url" CHARACTER SET utf8
END

    do_error_is_ok( dba_handle() => "DROP TABLE $table" )
        unless $OPT{'dryrun'};
    insert_schema( $schema );

    print_rt_config( Table => $table, MaxMatches => $maxmatches );

    require URI;
    my $urlo = URI->new( $url );
    my ($host, $port)  = split /:/, $urlo->authority;
    my $index = $urlo->path;
    $index =~ s{^/+}{};

    my $var_path = $RT::VarPath;

    my %sphinx_conf = ();
    $sphinx_conf{'host'} = RT->Config->Get('DatabaseHost');
    $sphinx_conf{'db'}   = RT->Config->Get('DatabaseName');
    $sphinx_conf{'user'} = RT->Config->Get('DatabaseUser');
    $sphinx_conf{'pass'} = RT->Config->Get('DatabasePassword');

    print <<END

Below is a simple Sphinx configuration which can be used to index all
text/plain attachments in your database.  This configuration is not
ideal; you should read the Sphinx documentation to understand how to
configure it to better suit your needs.  It assumes that you create the
$var_path/sphinx/ directory, and that is is writable by the sphinx
user.

source rt {
    type            = mysql

    sql_host        = $sphinx_conf{'host'}
    sql_db          = $sphinx_conf{'db'}
    sql_user        = $sphinx_conf{'user'}
    sql_pass        = $sphinx_conf{'pass'}

    sql_query_pre   = SET NAMES utf8
    sql_query       = \\
        SELECT a.id, a.content FROM Attachments a \\
        JOIN Transactions txn ON a.TransactionId = txn.id AND txn.ObjectType = 'RT::Ticket' \\
        JOIN Tickets t ON txn.ObjectId = t.id \\
        WHERE a.ContentType = 'text/plain' AND t.Status != 'deleted'

    sql_query_info  = SELECT * FROM Attachments WHERE id=\$id
}

index $index {
    source                  = rt
    path                    = $var_path/sphinx/index
    docinfo                 = extern
    charset_type            = utf-8
}

indexer {
    mem_limit               = 32M
}

searchd {
    port                    = $port
    log                     = $var_path/sphinx/searchd.log
    query_log               = $var_path/sphinx/query.log
    read_timeout            = 5
    max_children            = 30
    pid_file                = $var_path/sphinx/searchd.pid
    max_matches             = $maxmatches
    seamless_rotate         = 1
    preopen_indexes         = 0
    unlink_old              = 1
    # For sphinx >= 1.10:
    binlog_path             = $var_path/sphinx/
}

END

}
elsif ( $DB{'type'} eq 'Pg' ) {
    check_tsvalue();
    my $table = $OPT{'table'} || prompt(
        message => "Enter the name of a DB table that will be used to store the Pg tsvector.\n"
                 . "You may either use the existing Attachments table, or create a new\n"
                 . "table.  Creating a new table makes initial indexing faster.",
        default => $DEFAULT{'table'},
        silent  => !$OPT{'ask'},
    );
    my $column = $OPT{'column'} || prompt(
        message => 'Enter the name of a column that will be used to store the Pg tsvector:',
        default => $DEFAULT{'column'},
        silent  => !$OPT{'ask'},
    );

    my @schema;
    my $drop;
    if ( lc($table) eq 'attachments' ) {
        $drop = "ALTER TABLE $table DROP COLUMN $column";
        push @schema, "ALTER TABLE $table ADD COLUMN $column tsvector";
    } else {
        $drop = "DROP TABLE $table";
        push @schema, split /;\n+/, <<SCHEMA;
CREATE TABLE $table (
    id SERIAL,
    $column tsvector
);
GRANT SELECT, INSERT, UPDATE, DELETE ON $table TO "$DB{user}"
SCHEMA
    }

    my $index_type = lc($OPT{'index-type'} || '');
    while ( $index_type ne 'gist' and $index_type ne 'gin' ) {
        $index_type = lc prompt(
            message => "You may choose between GiST or GIN indexes; the GiST takes less space on\n"
                     . "disk and is faster to update, but is an order of magnitude slower to query.",
            default => 'GIN',
            silent  => !$OPT{'ask'},
        );
    }

    do_error_is_ok( dba_handle() => $drop )
        unless $OPT{'dryrun'};
    insert_schema( $_ ) for @schema;

    insert_data( Table => $table, Column => $column );

    insert_schema( "CREATE INDEX ${column}_idx ON $table USING $index_type($column)" );

    print_rt_config( Table => $table, Column => $column );
}
elsif ( $DB{'type'} eq 'Oracle' ) {
    {
        my $dbah = dba_handle();
        do_print_error( $dbah => 'GRANT CTXAPP TO '. $DB{'user'} );
        do_print_error( $dbah => 'GRANT EXECUTE ON CTXSYS.CTX_DDL TO '. $DB{'user'} );
    }

    my %PREFERENCES = (
        datastore => {
            type => 'DIRECT_DATASTORE',
        },
        filter => {
            type => 'AUTO_FILTER',
#        attributes => {
#            timeout => 120, # seconds
#            timeout_type => 'HEURISTIC', # or 'FIXED'
#        },
        },
        lexer => {
            type => 'WORLD_LEXER',
        },
        word_list => {
            type => 'BASIC_WORDLIST',
            attributes => {
                stemmer => 'AUTO',
                fuzzy_match => 'AUTO',
#            fuzzy_score => undef,
#            fuzzy_numresults => undef,
#            substring_index => undef,
#            prefix_index => undef,
#            prefix_length_min => undef,
#            prefix_length_max => undef,
#            wlidcard_maxterms => undef,
            },
        },
        'section_group' => {
            type => 'NULL_SECTION_GROUP',
        },

        storage => {
            type => 'BASIC_STORAGE',
            attributes => {
                R_TABLE_CLAUSE => 'lob (data) store as (cache)',
                I_INDEX_CLAUSE => 'compress 2',
            },
        },
    );

    my @params = ();
    push @params, ora_create_datastore( %{ $PREFERENCES{'datastore'} } );
    push @params, ora_create_filter( %{ $PREFERENCES{'filter'} } );
    push @params, ora_create_lexer( %{ $PREFERENCES{'lexer'} } );
    push @params, ora_create_word_list( %{ $PREFERENCES{'word_list'} } );
    push @params, ora_create_stop_list();
    push @params, ora_create_section_group( %{ $PREFERENCES{'section_group'} } );
    push @params, ora_create_storage( %{ $PREFERENCES{'storage'} } );

    my $index_params = join "\n", @params;
    my $index_name = $DEFAULT{prefix} .'index';
    do_error_is_ok( $dbh => "DROP INDEX $index_name" )
        unless $OPT{'dryrun'};
    $dbh->do(
        "CREATE INDEX $index_name ON Attachments(Content)
        indextype is ctxsys.context parameters('
            $index_params
        ')",
    ) unless $OPT{'dryrun'};

    print_rt_config( IndexName => $index_name );
}
else {
    die "Full-text indexes on $DB{type} are not yet supported";
}

sub check_tsvalue {
    my $dbh = $RT::Handle->dbh;
    my $fts = ($dbh->selectrow_array(<<EOQ))[0];
SELECT 1 FROM information_schema.routines WHERE routine_name = 'plainto_tsquery'
EOQ
    unless ($fts) {
        print STDERR <<EOT;

Your PostgreSQL server does not include full-text support.  You will
need to upgrade to PostgreSQL version 8.3 or higher to use full-text
indexing.

EOT
        exit 1;
    }
}

sub check_sphinx {
    return if $RT::Handle->CheckSphinxSE;

    print STDERR <<EOT;

Your MySQL server has not been compiled with the Sphinx storage engine
(sphinxse).  You will need to recompile MySQL according to the
instructions in Sphinx's documentation at
http://sphinxsearch.com/docs/current.html#sphinxse-installing

EOT
    exit 1;
}

sub ora_create_datastore {
    return sprintf 'datastore %s', ora_create_preference(
        @_,
        name => 'datastore',
    );
}

sub ora_create_filter {
    my $res = '';
    $res .= sprintf "format column %s\n", ora_create_format_column();
    $res .= sprintf 'filter %s', ora_create_preference(
        @_,
        name => 'filter',
    );
    return $res;
}

sub ora_create_lexer {
    return sprintf 'lexer %s', ora_create_preference(
        @_,
        name => 'lexer',
    );
}

sub ora_create_word_list {
    return sprintf 'wordlist %s', ora_create_preference(
        @_,
        name => 'word_list',
    );
}

sub ora_create_stop_list {
    my $file = shift || 'etc/stopwords/en.txt';
    return '' unless -e $file;

    my $name = $DEFAULT{'prefix'} .'stop_list';
    unless ($OPT{'dryrun'}) {
        do_error_is_ok( $dbh => 'begin ctx_ddl.drop_stoplist(?); end;', $name );

        $dbh->do(
            'begin ctx_ddl.create_stoplist(?, ?);  end;',
            undef, $name, 'BASIC_STOPLIST'
        );

        open( my $fh, '<:utf8', $file )
            or die "couldn't open file '$file': $!";
        while ( my $word = <$fh> ) {
            chomp $word;
            $dbh->do(
                'begin ctx_ddl.add_stopword(?, ?); end;',
                undef, $name, $word
            );
        }
        close $fh;
    }
    return sprintf 'stoplist %s', $name;
}

sub ora_create_section_group {
    my %args = @_;
    my $name = $DEFAULT{'prefix'} .'section_group';
    unless ($OPT{'dryrun'}) {
        do_error_is_ok( $dbh => 'begin ctx_ddl.drop_section_group(?); end;', $name );
        $dbh->do(
            'begin ctx_ddl.create_section_group(?, ?);  end;',
            undef, $name, $args{'type'}
        );
    }
    return sprintf 'section group %s', $name;
}

sub ora_create_storage {
    return sprintf 'storage %s', ora_create_preference(
        @_,
        name => 'storage',
    );
}

sub ora_create_format_column {
    my $column_name = 'ContentOracleFormat';
    return $column_name if $OPT{'dryrun'};
    unless (
        $dbh->column_info(
            undef, undef, uc('Attachments'), uc( $column_name )
        )->fetchrow_array
    ) {
        $dbh->do(qq{
            ALTER TABLE Attachments ADD $column_name VARCHAR2(10)
        });
    }

    my $detect_format = qq{
        CREATE OR REPLACE FUNCTION $DEFAULT{prefix}detect_format_simple(
            parent IN NUMBER,
            type IN VARCHAR2,
            encoding IN VARCHAR2,
            fname IN VARCHAR2
        )
        RETURN VARCHAR2
        AS
            format VARCHAR2(10);
        BEGIN
            format := CASE
    };
    unless ( $OPT{'attachments'} ) {
        $detect_format .= qq{
                WHEN fname IS NOT NULL THEN 'ignore'
        };
    }
    $detect_format .= qq{
                WHEN type = 'text' THEN 'text'
                WHEN type = 'text/rtf' THEN 'ignore'
                WHEN type LIKE 'text/%' THEN 'text'
                WHEN type LIKE 'message/%' THEN 'text'
                ELSE 'ignore'
            END;
            RETURN format;
        END;
    };
    ora_create_procedure( $detect_format );

    $dbh->do(qq{
        UPDATE Attachments
        SET $column_name = $DEFAULT{prefix}detect_format_simple(
            Parent,
            ContentType, ContentEncoding,
            Filename
        )
        WHERE $column_name IS NULL
    });
    $dbh->do(qq{
        CREATE OR REPLACE TRIGGER $DEFAULT{prefix}set_format
        BEFORE INSERT
        ON Attachments
        FOR EACH ROW
        BEGIN
            :new.$column_name := $DEFAULT{prefix}detect_format_simple(
                :new.Parent,
                :new.ContentType, :new.ContentEncoding,
                :new.Filename
            );
        END;
    });
    return $column_name;
}

sub ora_create_preference {
    my %info = @_;
    my $name = $DEFAULT{'prefix'} . $info{'name'};
    return $name if $OPT{'dryrun'};
    do_error_is_ok( $dbh => 'begin ctx_ddl.drop_preference(?); end;', $name );
    $dbh->do(
        'begin ctx_ddl.create_preference(?, ?);  end;',
        undef, $name, $info{'type'}
    );
    return $name unless $info{'attributes'};

    while ( my ($attr, $value) = each %{ $info{'attributes'} } ) {
        $dbh->do(
            'begin ctx_ddl.set_attribute(?, ?, ?);  end;',
            undef, $name, $attr, $value
        );
    }

    return $name;
}

sub ora_create_procedure {
    my $text = shift;

    return if $OPT{'dryrun'};
    my $status = $dbh->do($text, { RaiseError => 0 });

    # Statement succeeded
    return if $status;

    if ( 6550 != $dbh->err ) {
        # Utter failure
        die $dbh->errstr;
    }
    else {
        my $msg = $dbh->func( 'plsql_errstr' );
        die $dbh->errstr if !defined $msg;
        die $msg if $msg;
    }
}

sub dba_handle {
    if ( $DB{'type'} eq 'Oracle' ) {
        $ENV{'NLS_LANG'} = "AMERICAN_AMERICA.AL32UTF8";
        $ENV{'NLS_NCHAR'} = "AL32UTF8";
    }
    my $dsn = do { my $h = new RT::Handle; $h->BuildDSN; $h->DSN };
    my $dbh = DBI->connect(
        $dsn, $DB{admin}, $DB{admin_password},
        { RaiseError => 1, PrintError => 1 },
    );
    unless ( $dbh ) {
        die "Failed to connect to $dsn as user '$DB{admin}': ". $DBI::errstr;
    }
    return $dbh;
}

sub do_error_is_ok {
    my $dbh = shift;
    local $dbh->{'RaiseError'} = 0;
    local $dbh->{'PrintError'} = 0;
    return $dbh->do(shift, undef, @_);
}

sub do_print_error {
    my $dbh = shift;
    local $dbh->{'RaiseError'} = 0;
    local $dbh->{'PrintError'} = 1;
    return $dbh->do(shift, undef, @_);
}

sub prompt {
    my %args = ( @_ );
    return $args{'default'} if $args{'silent'};

    local $| = 1;
    print $args{'message'};
    if ( $args{'default'} ) {
        print "\n[". $args{'default'} .']: ';
    } else {
        print ":\n";
    }

    my $res = <STDIN>;
    chomp $res;
    print "\n";
    return $args{'default'} if !$res && $args{'default'};
    return $res;
}

sub verbose  { print @_, "\n" if $OPT{verbose} || $OPT{verbose}; 1 }
sub debug    { print @_, "\n" if $OPT{debug}; 1 }
sub error    { $RT::Logger->error( @_ ); verbose(@_); 1 }
sub warning  { $RT::Logger->warning( @_ ); verbose(@_); 1 }

sub show_help {
    my $error = shift;
    RT::Interface::CLI->ShowHelp(
        ExitValue => $error,
        Sections => 'NAME|DESCRIPTION',
    );
}

sub print_rt_config {
    my %args = @_;
    my $config = <<END;

You can now configure RT to use the newly-created full-text index by
adding the following to your RT_SiteConfig.pm:

Set( %FullTextSearch,
    Enable     => 1,
    Indexed    => 1,
END

    $config .= sprintf("    %-10s => '$args{$_}',\n",$_)
        foreach grep defined $args{$_}, keys %args;
    $config .= ");\n";

    print $config;
}

sub insert_schema {
    my $dbh = dba_handle();
    my $message = "Going to run the following in the DB:";
    my $schema = shift;
    print "$message\n";
    my $disp = $schema;
    $disp =~ s/^/    /mg;
    print "$disp\n\n";
    return if $OPT{'dryrun'};

    my $res = $dbh->do( $schema );
    unless ( $res ) {
        die "Couldn't run DDL query: ". $dbh->errstr;
    }
}

sub insert_data {
    return if $OPT{dryrun};

    print "Indexing existing data...\n";

    $ENV{RT_FTS_CONFIG} = JSON::to_json( {Enable => 1, Indexed => 1, @_});
    system( "$RT::SbinPath/rt-fulltext-indexer", "--all",
            ($DB{'batch-size'} ? ("--limit", $DB{'batch-size'}) : ()));
}

=head1 NAME

rt-setup-fulltext-index - Create indexes for full text search

=head1 DESCRIPTION

This script creates the appropriate tables, columns, functions, and / or
views necessary for full-text searching for your database type.  It will
drop any existing indexes in the process.

Please read F<docs/full_text_indexing.pod> for complete documentation on
full-text indexing for your database type.

If you have a non-standard database administrator user or password, you
may use the C<--dba> and C<--dba-password> parameters to set them
explicitly:

    rt-setup-fulltext-index --dba sysdba --dba-password 'secret'

To test what will happen without running any DDL, pass the C<--dryrun>
flag.

The Oracle index determines which content-types it will index at
creation time. By default, textual message bodies and textual uploaded
attachments (attachments with filenames) are indexed; to ignore textual
attachments, pass the C<--no-attachments> flag when the index is
created.


=head1 AUTHOR

Ruslan Zakirov E<lt>ruz@bestpractical.comE<gt>,
Alex Vandiver E<lt>alexmv@bestpractical.comE<gt>

=cut

