createCommonPasswordCdb.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class GenerateCommonPassword extends Maintenance {
    public function __construct() {
        global $IP;
        parent::__construct();
        $this->addDescription( 'Generate CDB file of common passwords' );
        $this->addOption( 'limit', "Max number of passwords to write", false, true, 'l' );
        $this->addArg( 'inputfile', 'List of passwords (one per line) to use or - for stdin', true );
        $this->addArg(
            'output',
            "Location to write CDB file to (Try $IP/serialized/commonpasswords.cdb)",
            true
        );
    }

    public function execute() {
        $limit = (int)$this->getOption( 'limit', PHP_INT_MAX );
        $langEn = Language::factory( 'en' );

        $infile = $this->getArg( 0 );
        if ( $infile === '-' ) {
            $infile = 'php://stdin';
        }
        $outfile = $this->getArg( 1 );

        if ( !is_readable( $infile ) && $infile !== 'php://stdin' ) {
            $this->error( "Cannot open input file $infile for reading", 1 );
        }

        $file = fopen( $infile, 'r' );
        if ( $file === false ) {
            $this->error( "Cannot read input file $infile", 1 );
        }

        try {
            $db = \Cdb\Writer::open( $outfile );

            $alreadyWritten = [];
            $skipped = 0;
            for ( $i = 0; ( $i - $skipped ) < $limit; $i++ ) {
                if ( feof( $file ) ) {
                    break;
                }
                $rawLine = fgets( $file );

                if ( $rawLine === false ) {
                    $this->error( "Error reading input file" );
                    break;
                }
                if ( substr( $rawLine, -1 ) !== "\n" && !feof( $file ) ) {
                    // We're assuming that this just won't happen.
                    $this->error( "fgets did not return whole line at $i??" );
                }
                $line = $langEn->lc( trim( $rawLine ) );
                if ( $line === '' ) {
                    $this->error( "Line number " . ( $i + 1 ) . " is blank?" );
                    $skipped++;
                    continue;
                }
                if ( isset( $alreadyWritten[$line] ) ) {
                    $this->output( "Password '$line' already written (line " . ( $i + 1 ) .")\n" );
                    $skipped++;
                    continue;
                }
                $alreadyWritten[$line] = true;
                $db->set( $line, $i + 1 - $skipped );
            }
            // All caps, so cannot conflict with potential password
            $db->set( '_TOTALENTRIES', $i - $skipped );
            $db->close();

            $this->output( "Successfully wrote " . ( $i - $skipped ) .
                " (out of $i) passwords to $outfile\n"
            );
        } catch ( \Cdb\Exception $e ) {
            $this->error( "Error writing cdb file: " . $e->getMessage(), 2 );
        }

    }
}

$maintClass = "GenerateCommonPassword";
require_once RUN_MAINTENANCE_IF_MAIN;