Securimage Class Reference

Collaboration diagram for Securimage:

Public Member Functions
	__construct ($options=array())
	Create a new securimage object, pass options to set in the constructor. More...
	show ($background_image='')
	Used to serve a captcha image to the browser. More...
	check ($code)
	Check a submitted code against the stored value. More...
	outputAudioFile ()
	Output a wav file of the captcha code to the browser. More...
	getCode ($array=false, $returnExisting=false)
	Return the code from the session or sqlite database if used. More...
	createCode ()
	Generates the code or math problem and saves the value to the session. More...
	getRandomNoiseFile ()
	frand ()
	Return a random float between 0 and 0.9999. More...
	errorHandler ($errno, $errstr, $errfile='', $errline=0, $errcontext=array())
	Error handler used when outputting captcha image or audio. More...

Static Public Member Functions
static	getPath ()
	Return the absolute path to the Securimage directory. More...
static	getCaptchaId ($new=true, array $options=array())
	Generate a new captcha ID or retrieve the current ID. More...
static	checkByCaptchaId ($id, $value, array $options=array())
	Validate a captcha code input against a captcha ID. More...

Data Fields
const	SI_IMAGE_JPEG = 1
const	SI_IMAGE_PNG = 2
const	SI_IMAGE_GIF = 3
const	SI_CAPTCHA_STRING = 0
const	SI_CAPTCHA_MATHEMATIC = 1
const	SI_CAPTCHA_WORDS = 2
const	SI_DRIVER_MYSQL = 'mysql'
const	SI_DRIVER_PGSQL = 'pgsql'
const	SI_DRIVER_SQLITE3 = 'sqlite'
	$image_width = 215
	$image_height = 80
	$image_type = self::SI_IMAGE_PNG
	$image_bg_color = '#ffffff'
	$text_color = '#707070'
	$line_color = '#707070'
	$noise_color = '#707070'
	$text_transparency_percentage = 20
	$use_transparent_text = true
	$code_length = 6
	$case_sensitive = false
	$charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789'
	$expiry_time = 900
	$session_name = null
	$use_wordlist = false
	$perturbation = 0.85
	$num_lines = 5
	$noise_level = 2
	$image_signature = ''
	$signature_color = '#707070'
	$signature_font
	$use_sqlite_db = false
	$use_database = false
	$database_driver = self::SI_DRIVER_SQLITE3
	$database_host = 'localhost'
	$database_user = ''
	$database_pass = ''
	$database_name = ''
	$database_table = 'captcha_codes'
	$database_file
	$captcha_type = self::SI_CAPTCHA_STRING
	$namespace
	$ttf_file
	$wordlist_file
	$background_directory
	$sqlite_database
	$audio_path
	$audio_noise_path
	$audio_use_noise
	$audio_mix_normalization = 0.6
	$degrade_audio
	$audio_gap_min = 0
	$audio_gap_max = 600
	$securimage_path = null
	$display_value

Protected Member Functions
	doImage ()
	The main image drawing routing, responsible for constructing the entire image and serving it. More...
	allocateColors ()
	Allocate the colors to be used for the image. More...
	setBackground ()
	The the background color, or background image to be used. More...
	getBackgroundFromDirectory ()
	Scan the directory for a background image to use. More...
	drawWord ()
	Draws the captcha code on the image. More...
	distortedCopy ()
	Copies the captcha image to the final image with distortion applied. More...
	drawLines ()
	Draws distorted lines on the image. More...
	drawNoise ()
	Draws random noise on the image. More...
	addSignature ()
	Print signature text on image. More...
	output ()
	Sends the appropriate image and cache headers and outputs image to the browser. More...
	getAudibleCode ()
	Gets the code and returns the binary audio file for the stored captcha code. More...
	readCodeFromFile ($numWords=1)
	Gets a captcha code from a wordlist. More...
	generateCode ()
	Generates a random captcha code from the set character set. More...
	validate ()
	Checks the entered code against the value stored in the session or sqlite database, handles case sensitivity Also clears the stored codes if the code was entered correctly to prevent re-use. More...
	saveData ()
	Save data to session namespace and database if used. More...
	saveCodeToDatabase ()
	Saves the code to the sqlite database. More...
	openDatabase ()
	Open sqlite database. More...
	getDsn ()
	checkTablesExist ()
	createDatabaseTables ()
	getCodeFromDatabase ()
	Get a code from the sqlite database for ip address/captchaId. More...
	clearCodeFromDatabase ()
	Remove an entered code from the database. More...
	purgeOldCodesFromDatabase ()
	Deletes old codes from sqlite database. More...
	isCodeExpired ($creation_time)
	Checks to see if the captcha code has expired and cannot be used. More...
	generateWAV ($letters)
	Generate a wav file given the $letters in the code. More...
	audioError ()
	Return a wav file saying there was an error generating file. More...
	canSendHeaders ()
	Checks to see if headers can be sent and if any error has been output to the browser. More...
	initColor ($color, $default)
	Convert an html color code to a Securimage_Color. More...

Protected Attributes
	$im
	$tmpimg
	$bgimg
	$iscale = 5
	$code
	$code_display
	$captcha_code
	$no_exit
	$no_session
	$send_headers
	$pdo_conn
	$gdbgcolor
	$gdtextcolor
	$gdlinecolor
	$gdsignaturecolor

Static Protected Attributes
static	$_captchaId = null

Detailed Description

Definition at line 165 of file securimage.php.

Constructor & Destructor Documentation

__construct()

Securimage::__construct

(

$options = array()

)

Create a new securimage object, pass options to set in the constructor.

This can be used to display a captcha, play an audible captcha, or validate an entry

Parameters

array

$options

$options = array( 'text_color' => new Securimage_Color('#013020'), 'code_length' => 5, 'num_lines' => 5, 'noise_level' => 3, 'font_file' => Securimage::getPath() . '/custom.ttf' );

$img = new Securimage($options);

Definition at line 629 of file securimage.php.

References $_captchaId, $options, $ttf_file, and initColor().

    {
        $this->securimage_path = dirname(__FILE__);

        if (is_array($options) && sizeof($options) > 0) {
            foreach($options as $prop => $val) {
                if ($prop == 'captchaId') {
                    Securimage::$_captchaId = $val;
                    $this->use_database     = true;
                } else if ($prop == 'use_sqlite_db') {
                    trigger_error("The use_sqlite_db option is deprecated, use 'use_database' instead", E_USER_NOTICE);
                } else {
                    $this->$prop = $val;
                }
            }
        }

        $this->image_bg_color  = $this->initColor($this->image_bg_color,  '#ffffff');
        $this->text_color      = $this->initColor($this->text_color,      '#616161');
        $this->line_color      = $this->initColor($this->line_color,      '#616161');
        $this->noise_color     = $this->initColor($this->noise_color,     '#616161');
        $this->signature_color = $this->initColor($this->signature_color, '#616161');

        if (is_null($this->ttf_file)) {
            $this->ttf_file = $this->securimage_path . '/AHGBold.ttf';
        }

        $this->signature_font = $this->ttf_file;

        if (is_null($this->wordlist_file)) {
            $this->wordlist_file = $this->securimage_path . '/words/words.txt';
        }

        if (is_null($this->database_file)) {
            $this->database_file = $this->securimage_path . '/database/securimage.sq3';
        }

        if (is_null($this->audio_path)) {
            $this->audio_path = $this->securimage_path . '/audio/en/';
        }

        if (is_null($this->audio_noise_path)) {
            $this->audio_noise_path = $this->securimage_path . '/audio/noise/';
        }

        if (is_null($this->audio_use_noise)) {
            $this->audio_use_noise = true;
        }

        if (is_null($this->degrade_audio)) {
            $this->degrade_audio = true;
        }

        if (is_null($this->code_length) || (int)$this->code_length < 1) {
            $this->code_length = 6;
        }

        if (is_null($this->perturbation) || !is_numeric($this->perturbation)) {
            $this->perturbation = 0.75;
        }

        if (is_null($this->namespace) || !is_string($this->namespace)) {
            $this->namespace = 'default';
        }

        if (is_null($this->no_exit)) {
            $this->no_exit = false;
        }

        if (is_null($this->no_session)) {
            $this->no_session = false;
        }

        if (is_null($this->send_headers)) {
            $this->send_headers = true;
        }

        if ($this->no_session != true) {
            // Initialize session or attach to existing
            if ( session_id() == '' ) { // no session has been started yet, which is needed for validation
                if (!is_null($this->session_name) && trim($this->session_name) != '') {
                    session_name(trim($this->session_name)); // set session name if provided
                }
                session_start();
            }
        }
    }

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Member Function Documentation

addSignature()

Securimage::addSignature ( )

protected

Print signature text on image.

Definition at line 1353 of file securimage.php.

References $x, and $y.

Referenced by doImage().

    {
        $bbox = imagettfbbox(10, 0, $this->signature_font, $this->image_signature);
        $textlen = $bbox[2] - $bbox[0];
        $x = $this->image_width - $textlen - 5;
        $y = $this->image_height - 3;

        imagettftext($this->im, 10, 0, $x, $y, $this->gdsignaturecolor, $this->signature_font, $this->image_signature);
    }

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allocateColors()

Securimage::allocateColors ( )

protected

Allocate the colors to be used for the image.

Definition at line 1015 of file securimage.php.

Referenced by doImage().

    {
        // allocate bg color first for imagecreate
        $this->gdbgcolor = imagecolorallocate($this->im,
                                              $this->image_bg_color->r,
                                              $this->image_bg_color->g,
                                              $this->image_bg_color->b);

        $alpha = intval($this->text_transparency_percentage / 100 * 127);

        if ($this->use_transparent_text == true) {
            $this->gdtextcolor = imagecolorallocatealpha($this->im,
                                                         $this->text_color->r,
                                                         $this->text_color->g,
                                                         $this->text_color->b,
                                                         $alpha);
            $this->gdlinecolor = imagecolorallocatealpha($this->im,
                                                         $this->line_color->r,
                                                         $this->line_color->g,
                                                         $this->line_color->b,
                                                         $alpha);
            $this->gdnoisecolor = imagecolorallocatealpha($this->im,
                                                          $this->noise_color->r,
                                                          $this->noise_color->g,
                                                          $this->noise_color->b,
                                                          $alpha);
        } else {
            $this->gdtextcolor = imagecolorallocate($this->im,
                                                    $this->text_color->r,
                                                    $this->text_color->g,
                                                    $this->text_color->b);
            $this->gdlinecolor = imagecolorallocate($this->im,
                                                    $this->line_color->r,
                                                    $this->line_color->g,
                                                    $this->line_color->b);
            $this->gdnoisecolor = imagecolorallocate($this->im,
                                                          $this->noise_color->r,
                                                          $this->noise_color->g,
                                                          $this->noise_color->b);
        }

        $this->gdsignaturecolor = imagecolorallocate($this->im,
                                                     $this->signature_color->r,
                                                     $this->signature_color->g,
                                                     $this->signature_color->b);

    }

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audioError()

Securimage::audioError ( )

protected

Return a wav file saying there was an error generating file.

Returns

string The binary audio contents

Definition at line 2031 of file securimage.php.

Referenced by outputAudioFile().

    {
        return @file_get_contents(dirname(__FILE__) . '/audio/en/error.wav');
    }

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canSendHeaders()

Securimage::canSendHeaders ( )

protected

Checks to see if headers can be sent and if any error has been output to the browser.

Returns

bool true if headers haven't been sent and no output/errors will break audio/images, false if unsafe

Definition at line 2041 of file securimage.php.

Referenced by output(), and outputAudioFile().

    {
        if (headers_sent()) {
            // output has been flushed and headers have already been sent
            return false;
        } else if (strlen((string)ob_get_contents()) > 0) {
            // headers haven't been sent, but there is data in the buffer that will break image and audio data
            return false;
        }

        return true;
    }

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check()

Securimage::check

(

$code

)

Check a submitted code against the stored value.

Parameters

string

$code

The captcha code to check $code = $_POST['code']; $img = new Securimage(); if ($img->check($code) == true) { $captcha_valid = true; } else { $captcha_valid = false; }

Definition at line 831 of file securimage.php.

References $code, and validate().

    {
        $this->code_entered = $code;
        $this->validate();
        return $this->correct_code;
    }

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checkByCaptchaId()

static Securimage::checkByCaptchaId (   $id,   $value, array  $options = array()  )

static

Validate a captcha code input against a captcha ID.

Parameters

string	$id	The captcha ID to check
string	$value	The captcha value supplied by the user
array	$options	Array of options to construct Securimage with. Options must include database options if they are not set in securimage.php

See also

Securimage::$database_driver

Returns

bool true if the code was valid for the given captcha ID, false if not or if database failed to open

Definition at line 763 of file securimage.php.

References $code, $id, $options, $si, and array.

    {
        $opts = array('captchaId'    => $id,
                      'no_session'   => true,
                      'use_database' => true);

        if (sizeof($options) > 0) $opts = array_merge($options, $opts);

        $si = new self($opts);

        if ($si->openDatabase()) {
            $code = $si->getCodeFromDatabase();

            if (is_array($code)) {
                $si->code         = $code['code'];
                $si->code_display = $code['code_disp'];
            }

            if ($si->check($value)) {
                $si->clearCodeFromDatabase();

                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

checkTablesExist()

Securimage::checkTablesExist ( )

protected

Definition at line 1701 of file securimage.php.

References $query, $result, and $table.

Referenced by openDatabase().

    {
        $table = $this->pdo_conn->quote($this->database_table);

        switch($this->database_driver) {
            case self::SI_DRIVER_SQLITE3:
                // query row count for sqlite, PRAGMA queries seem to return no
                // rowCount using PDO even if there are rows returned
                $query = "SELECT COUNT(id) FROM $table";
                break;

            case self::SI_DRIVER_MYSQL:
                $query = "SHOW TABLES LIKE $table";
                break;

            case self::SI_DRIVER_PGSQL:
                $query = "SELECT * FROM information_schema.columns WHERE table_name = $table;";
                break;
        }

        $result = $this->pdo_conn->query($query);

        if (!$result) {
            $err = $this->pdo_conn->errorInfo();

            if ($this->database_driver == self::SI_DRIVER_SQLITE3 &&
                $err[1] === 1 && strpos($err[2], 'no such table') !== false)
            {
                return false;
            }

            throw new Exception("Failed to check tables: {$err[0]} - {$err[1]}: {$err[2]}");
        } else if ($this->database_driver == self::SI_DRIVER_SQLITE3) {
            // successful here regardless of row count for sqlite
            return true;
        } else if ($result->rowCount() == 0) {
            return false;
        } else {
            return true;
        }
    }

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clearCodeFromDatabase()

Securimage::clearCodeFromDatabase ( )

protected

Remove an entered code from the database.

Definition at line 1856 of file securimage.php.

References $_captchaId, $_SERVER, $id, $query, and $result.

Referenced by saveCodeToDatabase(), and validate().

    {
        if ($this->pdo_conn) {
            $ip = $_SERVER['REMOTE_ADDR'];
            $ns = $this->pdo_conn->quote($this->namespace);
            $id = Securimage::$_captchaId;

            if (empty($id)) {
                $id = $ip; // if no captchaId set, IP address is captchaId.
            }

            $id = $this->pdo_conn->quote($id);

            $query = sprintf("DELETE FROM %s WHERE id = %s AND namespace = %s",
                             $this->database_table, $id, $ns);

            $result = $this->pdo_conn->query($query);
            if (!$result) {
                trigger_error("Failed to delete code from database.", E_USER_WARNING);
            }
        }
    }

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createCode()

Securimage::createCode

(

)

Generates the code or math problem and saves the value to the session.

Definition at line 1136 of file securimage.php.

References $case_sensitive, $code, array, generateCode(), readCodeFromFile(), and saveData().

Referenced by doImage(), and getAudibleCode().

    {
        $this->code = false;

        switch($this->captcha_type) {
            case self::SI_CAPTCHA_MATHEMATIC:
            {
                do {
                    $signs = array('+', '-', 'x');
                    $left  = mt_rand(1, 10);
                    $right = mt_rand(1, 5);
                    $sign  = $signs[mt_rand(0, 2)];

                    switch($sign) {
                        case 'x': $c = $left * $right; break;
                        case '-': $c = $left - $right; break;
                        default:  $c = $left + $right; break;
                    }
                } while ($c <= 0); // no negative #'s or 0

                $this->code         = $c;
                $this->code_display = "$left $sign $right";
                break;
            }

            case self::SI_CAPTCHA_WORDS:
                $words = $this->readCodeFromFile(2);
                $this->code = implode(' ', $words);
                $this->code_display = $this->code;
                break;

            default:
            {
                if ($this->use_wordlist && is_readable($this->wordlist_file)) {
                    $this->code = $this->readCodeFromFile();
                }

                if ($this->code == false) {
                    $this->code = $this->generateCode($this->code_length);
                }

                $this->code_display = $this->code;
                $this->code         = ($this->case_sensitive) ? $this->code : strtolower($this->code);
            } // default
        }

        $this->saveData();
    }

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createDatabaseTables()

Securimage::createDatabaseTables ( )

protected

Definition at line 1743 of file securimage.php.

References $query, $result, and array.

Referenced by openDatabase().

    {
        $queries = array();

        switch($this->database_driver) {
            case self::SI_DRIVER_SQLITE3:
                $queries[] = "CREATE TABLE \"{$this->database_table}\" (
                                id VARCHAR(40),
                                namespace VARCHAR(32) NOT NULL,
                                code VARCHAR(32) NOT NULL,
                                code_display VARCHAR(32) NOT NULL,
                                created INTEGER NOT NULL,
                                PRIMARY KEY(id, namespace)
                              )";

                $queries[] = "CREATE INDEX ndx_created ON {$this->database_table} (created)";
                break;

            case self::SI_DRIVER_MYSQL:
                $queries[] = "CREATE TABLE `{$this->database_table}` (
                                `id` VARCHAR(40) NOT NULL,
                                `namespace` VARCHAR(32) NOT NULL,
                                `code` VARCHAR(32) NOT NULL,
                                `code_display` VARCHAR(32) NOT NULL,
                                `created` INT NOT NULL,
                                PRIMARY KEY(id, namespace),
                                INDEX(created)
                              )";
                break;

            case self::SI_DRIVER_PGSQL:
                $queries[] = "CREATE TABLE {$this->database_table} (
                                id character varying(40) NOT NULL,
                                namespace character varying(32) NOT NULL,
                                code character varying(32) NOT NULL,
                                code_display character varying(32) NOT NULL,
                                created integer NOT NULL,
                                CONSTRAINT pkey_id_namespace PRIMARY KEY (id, namespace)
                              )";

                $queries[] = "CREATE INDEX ndx_created ON {$this->database_table} (created);";
                break;
        }

        $this->pdo_conn->beginTransaction();

        foreach($queries as $query) {
            $result = $this->pdo_conn->query($query);

            if (!$result) {
                $err = $this->pdo_conn->errorInfo();
                trigger_error("Failed to create table.  {$err[1]}: {$err[2]}", E_USER_WARNING);
                $this->pdo_conn->rollBack();
                $this->pdo_conn = false;
                return false;
            }
        }

        $this->pdo_conn->commit();

        return true;
    }

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distortedCopy()

Securimage::distortedCopy ( )

protected

Copies the captcha image to the final image with distortion applied.

Definition at line 1226 of file securimage.php.

References $i, $image_height, $image_width, $iscale, $px, $py, $r, $x, $y, and frand().

Referenced by doImage().

    {
        $numpoles = 3; // distortion factor
        // make array of poles AKA attractor points
        for ($i = 0; $i < $numpoles; ++ $i) {
            $px[$i]  = mt_rand($this->image_width  * 0.2, $this->image_width  * 0.8);
            $py[$i]  = mt_rand($this->image_height * 0.2, $this->image_height * 0.8);
            $rad[$i] = mt_rand($this->image_height * 0.2, $this->image_height * 0.8);
            $tmp     = ((- $this->frand()) * 0.15) - .15;
            $amp[$i] = $this->perturbation * $tmp;
        }

        $bgCol = imagecolorat($this->tmpimg, 0, 0);
        $width2 = $this->iscale * $this->image_width;
        $height2 = $this->iscale * $this->image_height;
        imagepalettecopy($this->im, $this->tmpimg); // copy palette to final image so text colors come across
        // loop over $img pixels, take pixels from $tmpimg with distortion field
        for ($ix = 0; $ix < $this->image_width; ++ $ix) {
            for ($iy = 0; $iy < $this->image_height; ++ $iy) {
                $x = $ix;
                $y = $iy;
                for ($i = 0; $i < $numpoles; ++ $i) {
                    $dx = $ix - $px[$i];
                    $dy = $iy - $py[$i];
                    if ($dx == 0 && $dy == 0) {
                        continue;
                    }
                    $r = sqrt($dx * $dx + $dy * $dy);
                    if ($r > $rad[$i]) {
                        continue;
                    }
                    $rscale = $amp[$i] * sin(3.14 * $r / $rad[$i]);
                    $x += $dx * $rscale;
                    $y += $dy * $rscale;
                }
                $c = $bgCol;
                $x *= $this->iscale;
                $y *= $this->iscale;
                if ($x >= 0 && $x < $width2 && $y >= 0 && $y < $height2) {
                    $c = imagecolorat($this->tmpimg, $x, $y);
                }
                if ($c != $bgCol) { // only copy pixels of letters to preserve any background image
                    imagesetpixel($this->im, $ix, $iy, $c);
                }
            }
        }
    }

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doImage()

Securimage::doImage ( )

protected

The main image drawing routing, responsible for constructing the entire image and serving it.

Definition at line 944 of file securimage.php.

References $case_sensitive, $code, $display_value, addSignature(), allocateColors(), createCode(), distortedCopy(), drawLines(), drawNoise(), drawWord(), getCaptchaId(), getCodeFromDatabase(), openDatabase(), output(), and setBackground().

Referenced by show().

    {
        if( ($this->use_transparent_text == true || $this->bgimg != '') && function_exists('imagecreatetruecolor')) {
            $imagecreate = 'imagecreatetruecolor';
        } else {
            $imagecreate = 'imagecreate';
        }

        $this->im     = $imagecreate($this->image_width, $this->image_height);
        $this->tmpimg = $imagecreate($this->image_width * $this->iscale, $this->image_height * $this->iscale);

        $this->allocateColors();
        imagepalettecopy($this->tmpimg, $this->im);

        $this->setBackground();

        $code = '';

        if ($this->getCaptchaId(false) !== null) {
            // a captcha Id was supplied

            // check to see if a display_value for the captcha image was set
            if (is_string($this->display_value) && strlen($this->display_value) > 0) {
                $this->code_display = $this->display_value;
                $this->code         = ($this->case_sensitive) ?
                                       $this->display_value   :
                                       strtolower($this->display_value);
                $code = $this->code;
            } else if ($this->openDatabase()) {
                // no display_value, check the database for existing captchaId
                $code = $this->getCodeFromDatabase();

                // got back a result from the database with a valid code for captchaId
                if (is_array($code)) {
                    $this->code         = $code['code'];
                    $this->code_display = $code['code_disp'];
                    $code = $code['code'];
                }
            }
        }

        if ($code == '') {
            // if the code was not set using display_value or was not found in
            // the database, create a new code
            $this->createCode();
        }

        if ($this->noise_level > 0) {
            $this->drawNoise();
        }

        $this->drawWord();

        if ($this->perturbation > 0 && is_readable($this->ttf_file)) {
            $this->distortedCopy();
        }

        if ($this->num_lines > 0) {
            $this->drawLines();
        }

        if (trim($this->image_signature) != '') {
            $this->addSignature();
        }

        $this->output();
    }

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drawLines()

Securimage::drawLines ( )

protected

Draws distorted lines on the image.

Definition at line 1277 of file securimage.php.

References $i, $image_width, $n, $num_lines, $w, $x, $y, and frand().

Referenced by doImage().

    {
        for ($line = 0; $line < $this->num_lines; ++ $line) {
            $x = $this->image_width * (1 + $line) / ($this->num_lines + 1);
            $x += (0.5 - $this->frand()) * $this->image_width / $this->num_lines;
            $y = mt_rand($this->image_height * 0.1, $this->image_height * 0.9);

            $theta = ($this->frand() - 0.5) * M_PI * 0.7;
            $w = $this->image_width;
            $len = mt_rand($w * 0.4, $w * 0.7);
            $lwid = mt_rand(0, 2);

            $k = $this->frand() * 0.6 + 0.2;
            $k = $k * $k * 0.5;
            $phi = $this->frand() * 6.28;
            $step = 0.5;
            $dx = $step * cos($theta);
            $dy = $step * sin($theta);
            $n = $len / $step;
            $amp = 1.5 * $this->frand() / ($k + 5.0 / $len);
            $x0 = $x - 0.5 * $len * cos($theta);
            $y0 = $y - 0.5 * $len * sin($theta);

            $ldx = round(- $dy * $lwid);
            $ldy = round($dx * $lwid);

            for ($i = 0; $i < $n; ++ $i) {
                $x = $x0 + $i * $dx + $amp * $dy * sin($k * $i * $step + $phi);
                $y = $y0 + $i * $dy - $amp * $dx * sin($k * $i * $step + $phi);
                imagefilledrectangle($this->im, $x, $y, $x + $lwid, $y + $lwid, $this->gdlinecolor);
            }
        }
    }

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drawNoise()

Securimage::drawNoise ( )

protected

Draws random noise on the image.

Definition at line 1314 of file securimage.php.

References $i, $iscale, $noise_level, $size, $t, $x, and $y.

Referenced by doImage().

    {
        if ($this->noise_level > 10) {
            $noise_level = 10;
        } else {
            $noise_level = $this->noise_level;
        }

        $t0 = microtime(true);

        $noise_level *= 125; // an arbitrary number that works well on a 1-10 scale

        $points = $this->image_width * $this->image_height * $this->iscale;
        $height = $this->image_height * $this->iscale;
        $width  = $this->image_width * $this->iscale;
        for ($i = 0; $i < $noise_level; ++$i) {
            $x = mt_rand(10, $width);
            $y = mt_rand(10, $height);
            $size = mt_rand(7, 10);
            if ($x - $size <= 0 && $y - $size <= 0) continue; // dont cover 0,0 since it is used by imagedistortedcopy
            imagefilledarc($this->tmpimg, $x, $y, $size, $size, 0, 360, $this->gdnoisecolor, IMG_ARC_PIE);
        }

        $t1 = microtime(true);

        $t = $t1 - $t0;

        /*
        // DEBUG
        imagestring($this->tmpimg, 5, 25, 30, "$t", $this->gdnoisecolor);
        header('content-type: image/png');
        imagepng($this->tmpimg);
        exit;
        */
    }

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drawWord()

Securimage::drawWord ( )

protected

Draws the captcha code on the image.

Definition at line 1188 of file securimage.php.

References $iscale, $x, and $y.

Referenced by doImage().

    {
        $width2  = $this->image_width * $this->iscale;
        $height2 = $this->image_height * $this->iscale;

        if (!is_readable($this->ttf_file)) {
            imagestring($this->im, 4, 10, ($this->image_height / 2) - 5, 'Failed to load TTF font file!', $this->gdtextcolor);
        } else {
            if ($this->perturbation > 0) {
                $font_size = $height2 * .4;
                $bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
                $tx = $bb[4] - $bb[0];
                $ty = $bb[5] - $bb[1];
                $x  = floor($width2 / 2 - $tx / 2 - $bb[0]);
                $y  = round($height2 / 2 - $ty / 2 - $bb[1]);

                imagettftext($this->tmpimg, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
            } else {
                $font_size = $this->image_height * .4;
                $bb = imageftbbox($font_size, 0, $this->ttf_file, $this->code_display);
                $tx = $bb[4] - $bb[0];
                $ty = $bb[5] - $bb[1];
                $x  = floor($this->image_width / 2 - $tx / 2 - $bb[0]);
                $y  = round($this->image_height / 2 - $ty / 2 - $bb[1]);

                imagettftext($this->im, $font_size, 0, $x, $y, $this->gdtextcolor, $this->ttf_file, $this->code_display);
            }
        }

        // DEBUG
        //$this->im = $this->tmpimg;
        //$this->output();

    }

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errorHandler()

Securimage::errorHandler	(		$errno,
			$errstr,
			$errfile = '',
			$errline = 0,
			$errcontext = array()
	)

Error handler used when outputting captcha image or audio.

This error handler helps determine if any errors raised would prevent captcha image or audio from displaying. If they have no effect on the output buffer or headers, true is returned so the script can continue processing. See https://github.com/dapphp/securimage/issues/15

Parameters

int	$errno
string	$errstr
string	$errfile
int	$errline
array	$errcontext

Returns

boolean true if handled, false if PHP should handle

Definition at line 2101 of file securimage.php.

    {
        // get the current error reporting level
        $level = error_reporting();

        // if error was supressed or $errno not set in current error level
        if ($level == 0 || ($level & $errno) == 0) {
            return true;
        }

        return false;
    }

frand()

Securimage::frand

(

)

Return a random float between 0 and 0.9999.

Returns

float Random float between 0 and 0.9999

Definition at line 2059 of file securimage.php.

Referenced by distortedCopy(), and drawLines().

    {
        return 0.0001 * mt_rand(0,9999);
    }

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generateCode()

Securimage::generateCode ( )

protected

Generates a random captcha code from the set character set.

Definition at line 1499 of file securimage.php.

References $code, $code_length, and $i.

Referenced by createCode().

    {
        $code = '';

        if (function_exists('mb_strlen')) {
            for($i = 1, $cslen = mb_strlen($this->charset); $i <= $this->code_length; ++$i) {
                $code .= mb_substr($this->charset, mt_rand(0, $cslen - 1), 1, 'UTF-8');
            }
        } else {
            for($i = 1, $cslen = strlen($this->charset); $i <= $this->code_length; ++$i) {
                $code .= substr($this->charset, mt_rand(0, $cslen - 1), 1);
            }
        }

        return $code;
    }

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generateWAV()

Securimage::generateWAV (   $letters )

protected

Generate a wav file given the $letters in the code.

Todo:

Add ability to merge 2 sound files together to have random background sounds

Parameters

array

$letters

Returns

string The binary contents of the wav file

Definition at line 1920 of file securimage.php.

References $audio_mix_normalization, $l, array, WavFile\FILTER_DEGRADE, WavFile\FILTER_MIX, WavFile\FILTER_NORMALIZE, and getRandomNoiseFile().

Referenced by getAudibleCode().

    {
        $wavCaptcha = new WavFile();
        $first      = true;     // reading first wav file

        foreach ($letters as $letter) {
            $letter = strtoupper($letter);

            try {
                $l = new WavFile($this->audio_path . '/' . $letter . '.wav');

                if ($first) {
                    // set sample rate, bits/sample, and # of channels for file based on first letter
                    $wavCaptcha->setSampleRate($l->getSampleRate())
                               ->setBitsPerSample($l->getBitsPerSample())
                               ->setNumChannels($l->getNumChannels());
                    $first = false;
                }

                // append letter to the captcha audio
                $wavCaptcha->appendWav($l);

                // random length of silence between $audio_gap_min and $audio_gap_max
                if ($this->audio_gap_max > 0 && $this->audio_gap_max > $this->audio_gap_min) {
                    $wavCaptcha->insertSilence( mt_rand($this->audio_gap_min, $this->audio_gap_max) / 1000.0 );
                }
            } catch (Exception $ex) {
                // failed to open file, or the wav file is broken or not supported
                // 2 wav files were not compatible, different # channels, bits/sample, or sample rate
                throw $ex;
            }
        }

        /********* Set up audio filters *****************************/
        $filters = array();

        if ($this->audio_use_noise == true) {
            // use background audio - find random file
            $noiseFile = $this->getRandomNoiseFile();

            if ($noiseFile !== false && is_readable($noiseFile)) {
                try {
                    $wavNoise = new WavFile($noiseFile, false);
                } catch(Exception $ex) {
                    throw $ex;
                }

                // start at a random offset from the beginning of the wavfile
                // in order to add more randomness
                $randOffset = 0;
                if ($wavNoise->getNumBlocks() > 2 * $wavCaptcha->getNumBlocks()) {
                    $randBlock = mt_rand(0, $wavNoise->getNumBlocks() - $wavCaptcha->getNumBlocks());
                    $wavNoise->readWavData($randBlock * $wavNoise->getBlockAlign(), $wavCaptcha->getNumBlocks() * $wavNoise->getBlockAlign());
                } else {
                    $wavNoise->readWavData();
                    $randOffset = mt_rand(0, $wavNoise->getNumBlocks() - 1);
                }


                $mixOpts = array('wav'  => $wavNoise,
                                 'loop' => true,
                                 'blockOffset' => $randOffset);

                $filters[WavFile::FILTER_MIX]       = $mixOpts;
                $filters[WavFile::FILTER_NORMALIZE] = $this->audio_mix_normalization;
            }
        }

        if ($this->degrade_audio == true) {
            // add random noise.
            // any noise level below 95% is intensely distorted and not pleasant to the ear
            $filters[WavFile::FILTER_DEGRADE] = mt_rand(95, 98) / 100.0;
        }

        if (!empty($filters)) {
            $wavCaptcha->filter($filters);  // apply filters to captcha audio
        }

        return $wavCaptcha->__toString();
    }

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getAudibleCode()

Securimage::getAudibleCode ( )

protected

Gets the code and returns the binary audio file for the stored captcha code.

Returns

The audio representation of the captcha in Wav format

Definition at line 1413 of file securimage.php.

References $code, $i, array, createCode(), generateWAV(), and getCode().

Referenced by outputAudioFile().

    {
        $letters = array();
        $code    = $this->getCode(true, true);

        if ($code['code'] == '') {
            if (strlen($this->display_value) > 0) {
                $code = array('code' => $this->display_value, 'display' => $this->display_value);
            } else {
                $this->createCode();
                $code = $this->getCode(true);
            }
        }

        if (preg_match('/(\d+) (\+|-|x) (\d+)/i', $code['display'], $eq)) {
            $math = true;

            $left  = $eq[1];
            $sign  = str_replace(array('+', '-', 'x'), array('plus', 'minus', 'times'), $eq[2]);
            $right = $eq[3];

            $letters = array($left, $sign, $right);
        } else {
            $math = false;

            $length = strlen($code['display']);

            for($i = 0; $i < $length; ++$i) {
                $letter    = $code['display']{$i};
                $letters[] = $letter;
            }
        }

        try {
            return $this->generateWAV($letters);
        } catch(Exception $ex) {
            throw $ex;
        }
    }

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getBackgroundFromDirectory()

Securimage::getBackgroundFromDirectory ( )

protected

Scan the directory for a background image to use.

Definition at line 1114 of file securimage.php.

References $file, and array.

Referenced by setBackground().

    {
        $images = array();

        if ( ($dh = opendir($this->background_directory)) !== false) {
            while (($file = readdir($dh)) !== false) {
                if (preg_match('/(jpg|gif|png)$/i', $file)) $images[] = $file;
            }

            closedir($dh);

            if (sizeof($images) > 0) {
                return rtrim($this->background_directory, '/') . '/' . $images[mt_rand(0, sizeof($images)-1)];
            }
        }

        return false;
    }

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getCaptchaId()

static Securimage::getCaptchaId (   $new = true, array  $options = array()  )

static

Generate a new captcha ID or retrieve the current ID.

Parameters

$new	bool If true, generates a new challenge and returns and ID
$options	array Additional options to be passed to Securimage. Must include database options if not set directly in securimage.php

Returns

null|string Returns null if no captcha id set and new was false, or string captcha ID

Definition at line 735 of file securimage.php.

References $_captchaId, $_SERVER, $id, $new, $options, $si, and array.

Referenced by doImage(), and saveCodeToDatabase().

    {
        if (is_null($new) || (bool)$new == true) {
            $id = sha1(uniqid($_SERVER['REMOTE_ADDR'], true));
            $opts = array('no_session'    => true,
                          'use_database'  => true);
            if (sizeof($options) > 0) $opts = array_merge($options, $opts);
            $si = new self($opts);
            Securimage::$_captchaId = $id;
            $si->createCode();

            return $id;
        } else {
            return Securimage::$_captchaId;
        }
    }

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getCode()

Securimage::getCode	(		$array = false,
			$returnExisting = false
	)

Return the code from the session or sqlite database if used.

If none exists yet, an empty string is returned

Parameters

$array

bool True to receive an array containing the code and properties

Returns

array|string Array if $array = true, otherwise a string containing the code

Definition at line 899 of file securimage.php.

References $_SESSION, $code, $namespace, $time, array, getCodeFromDatabase(), isCodeExpired(), and openDatabase().

Referenced by getAudibleCode(), and validate().

    {
        $code = '';
        $time = 0;
        $disp = 'error';

        if ($returnExisting && strlen($this->code) > 0) {
            if ($array) {
                return array('code' => $this->code,
                             'display' => $this->code_display,
                             'code_display' => $this->code_display,
                             'time' => 0);
            } else {
                return $this->code;
            }
        }

        if ($this->no_session != true) {
            if (isset($_SESSION['securimage_code_value'][$this->namespace]) &&
                    trim($_SESSION['securimage_code_value'][$this->namespace]) != '') {
                if ($this->isCodeExpired(
                        $_SESSION['securimage_code_ctime'][$this->namespace]) == false) {
                    $code = $_SESSION['securimage_code_value'][$this->namespace];
                    $time = $_SESSION['securimage_code_ctime'][$this->namespace];
                    $disp = $_SESSION['securimage_code_disp'] [$this->namespace];
                }
            }
        }

        if (empty($code) && $this->use_database) {
            // no code in session - may mean user has cookies turned off
            $this->openDatabase();
            $code = $this->getCodeFromDatabase();
        } else { /* no code stored in session or sqlite database, validation will fail */ }

        if ($array == true) {
            return array('code' => $code, 'ctime' => $time, 'display' => $disp);
        } else {
            return $code;
        }
    }

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getCodeFromDatabase()

Securimage::getCodeFromDatabase ( )

protected

Get a code from the sqlite database for ip address/captchaId.

Returns

string|array Empty string if no code was found or has expired, otherwise returns the stored captcha code. If a captchaId is set, this returns an array with indices "code" and "code_disp"

Definition at line 1813 of file securimage.php.

References $_captchaId, $_SERVER, $code, $namespace, $query, $result, $row, array, and isCodeExpired().

Referenced by doImage(), and getCode().

    {
        $code = '';

        if ($this->use_database == true && $this->pdo_conn) {
            if (Securimage::$_captchaId !== null) {
                $query  = "SELECT * FROM {$this->database_table} WHERE id = ?";
                $stmt   = $this->pdo_conn->prepare($query);
                $result = $stmt->execute(array(Securimage::$_captchaId));
            } else {
                $ip = $_SERVER['REMOTE_ADDR'];
                $ns = $this->namespace;

                // ip is stored in id column when no captchaId
                $query  = "SELECT * FROM {$this->database_table} WHERE id = ? AND namespace = ?";
                $stmt   = $this->pdo_conn->prepare($query);
                $result = $stmt->execute(array($ip, $ns));
            }

            if (!$result) {
                $err = $this->pdo_conn->errorInfo();
                trigger_error("Failed to select code from database.  {$err[0]}: {$err[1]}", E_USER_WARNING);
            } else {
                if ( ($row = $stmt->fetch()) !== false ) {
                    if (false == $this->isCodeExpired($row['created'])) {
                        if (Securimage::$_captchaId !== null) {
                            // return an array when using captchaId
                            $code = array('code'      => $row['code'],
                                          'code_disp' => $row['code_display']);
                        } else {
                            $code = $row['code'];
                        }
                    }
                }
            }
        }

        return $code;
    }

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getDsn()

Securimage::getDsn ( )

protected

Definition at line 1680 of file securimage.php.

References $database_file.

Referenced by openDatabase().

    {
        $dsn = sprintf('%s:', $this->database_driver);

        switch($this->database_driver) {
            case self::SI_DRIVER_SQLITE3:
                $dsn .= $this->database_file;
                break;

            case self::SI_DRIVER_MYSQL:
            case self::SI_DRIVER_PGSQL:
                $dsn .= sprintf('host=%s;dbname=%s',
                                $this->database_host,
                                $this->database_name);
                break;

        }

        return $dsn;
    }

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getPath()

static Securimage::getPath ( )

static

Return the absolute path to the Securimage directory.

Returns

string The path to the securimage base directory

Definition at line 721 of file securimage.php.

    {
        return dirname(__FILE__);
    }

getRandomNoiseFile()

Securimage::getRandomNoiseFile

(

)

Definition at line 2001 of file securimage.php.

References $file, $list, and array.

Referenced by generateWAV().

    {
        $return = false;

        if ( ($dh = opendir($this->audio_noise_path)) !== false ) {
            $list = array();

            while ( ($file = readdir($dh)) !== false ) {
                if ($file == '.' || $file == '..') continue;
                if (strtolower(substr($file, -4)) != '.wav') continue;

                $list[] = $file;
            }

            closedir($dh);

            if (sizeof($list) > 0) {
                $file   = $list[array_rand($list, 1)];
                $return = $this->audio_noise_path . DIRECTORY_SEPARATOR . $file;
            }
        }

        return $return;
    }

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initColor()

Securimage::initColor (   $color,   $default  )

protected

Convert an html color code to a Securimage_Color.

Parameters

string	$color
Securimage_Color	$default	The defalt color to use if $color is invalid

Definition at line 2069 of file securimage.php.

Referenced by __construct().

    {
        if ($color == null) {
            return new Securimage_Color($default);
        } else if (is_string($color)) {
            try {
                return new Securimage_Color($color);
            } catch(Exception $e) {
                return new Securimage_Color($default);
            }
        } else if (is_array($color) && sizeof($color) == 3) {
            return new Securimage_Color($color[0], $color[1], $color[2]);
        } else {
            return new Securimage_Color($default);
        }
    }

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isCodeExpired()

Securimage::isCodeExpired (   $creation_time )

protected

Checks to see if the captcha code has expired and cannot be used.

Parameters

unknown_type

$creation_time

Definition at line 1901 of file securimage.php.

References time.

Referenced by getCode(), and getCodeFromDatabase().

    {
        $expired = true;

        if (!is_numeric($this->expiry_time) || $this->expiry_time < 1) {
            $expired = false;
        } else if (time() - $creation_time < $this->expiry_time) {
            $expired = false;
        }

        return $expired;
    }

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openDatabase()

Securimage::openDatabase ( )

protected

Open sqlite database.

Definition at line 1623 of file securimage.php.

References $options, $pdo_conn, array, checkTablesExist(), createDatabaseTables(), getDsn(), and purgeOldCodesFromDatabase().

Referenced by doImage(), getCode(), and saveCodeToDatabase().

    {
        $this->pdo_conn = false;

        if ($this->use_database) {
            $pdo_extension = 'PDO_' . strtoupper($this->database_driver);

            if (!extension_loaded($pdo_extension)) {
                trigger_error("Database support is turned on in Securimage, but the chosen extension $pdo_extension is not loaded in PHP.", E_USER_WARNING);
                return false;
            }
        }

        if ($this->database_driver == self::SI_DRIVER_SQLITE3) {
            if (!file_exists($this->database_file)) {
                $fp = fopen($this->database_file, 'w+');
                if (!$fp) {
                    $err = error_get_last();
                    trigger_error("Securimage failed to create SQLite3 database file '{$this->database_file}'. Reason: {$err['message']}", E_USER_WARNING);
                    return false;
                }
                fclose($fp);
                chmod($this->database_file, 0666);
            } else if (!is_writeable($this->database_file)) {
                trigger_error("Securimage does not have read/write access to database file '{$this->database_file}. Make sure permissions are 0666 and writeable by user '" . get_current_user() . "'", E_USER_WARNING);
                return false;
            }
        }

        $dsn = $this->getDsn();

        try {
            $options        = array();
            $this->pdo_conn = new PDO($dsn, $this->database_user, $this->database_pass, $options);
        } catch (PDOException $pdoex) {
            trigger_error("Database connection failed: " . $pdoex->getMessage(), E_USER_WARNING);
            return false;
        }

        try {
            if (!$this->checkTablesExist()) {
                // create tables...
                $this->createDatabaseTables();
            }
        } catch (Exception $ex) {
            trigger_error($ex->getMessage(), E_USER_WARNING);
            $this->pdo_conn = null;
            return false;
        }

        if (mt_rand(0, 100) / 100.0 == 1.0) {
            $this->purgeOldCodesFromDatabase();
        }

        return $this->pdo_conn;
    }

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output()

Securimage::output ( )

protected

Sends the appropriate image and cache headers and outputs image to the browser.

Definition at line 1366 of file securimage.php.

References canSendHeaders(), exit, and header.

Referenced by doImage().

    {
        if ($this->canSendHeaders() || $this->send_headers == false) {
            if ($this->send_headers) {
                // only send the content-type headers if no headers have been output
                // this will ease debugging on misconfigured servers where warnings
                // may have been output which break the image and prevent easily viewing
                // source to see the error.
                header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
                header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
                header("Cache-Control: no-store, no-cache, must-revalidate");
                header("Cache-Control: post-check=0, pre-check=0", false);
                header("Pragma: no-cache");
            }

            switch ($this->image_type) {
                case self::SI_IMAGE_JPEG:
                    if ($this->send_headers) header("Content-Type: image/jpeg");
                    imagejpeg($this->im, null, 90);
                    break;
                case self::SI_IMAGE_GIF:
                    if ($this->send_headers) header("Content-Type: image/gif");
                    imagegif($this->im);
                    break;
                default:
                    if ($this->send_headers) header("Content-Type: image/png");
                    imagepng($this->im);
                    break;
            }
        } else {
            echo '<hr /><strong>'
                .'Failed to generate captcha image, content has already been '
                .'output.<br />This is most likely due to misconfiguration or '
                .'a PHP error was sent to the browser.</strong>';
        }

        imagedestroy($this->im);
        restore_error_handler();

        if (!$this->no_exit) exit;
    }

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outputAudioFile()

Securimage::outputAudioFile

(

)

Output a wav file of the captcha code to the browser.

$img = new Securimage(); $img->outputAudioFile(); // outputs a wav file to the browser exit;

Definition at line 847 of file securimage.php.

References array, audioError(), canSendHeaders(), date, exit, getAudibleCode(), and header.

    {
        set_error_handler(array(&$this, 'errorHandler'));

        require_once dirname(__FILE__) . '/WavFile.php';

        try {
            $audio = $this->getAudibleCode();
        } catch (Exception $ex) {
            if (($fp = @fopen(dirname(__FILE__) . '/si.error_log', 'a+')) !== false) {
                fwrite($fp, date('Y-m-d H:i:s') . ': Securimage audio error "' . $ex->getMessage() . '"' . "\n");
                fclose($fp);
            }

            $audio = $this->audioError();
        }

        if ($this->canSendHeaders() || $this->send_headers == false) {
            if ($this->send_headers) {
                $uniq = md5(uniqid(microtime()));
                header("Content-Disposition: attachment; filename=\"securimage_audio-{$uniq}.wav\"");
                header('Cache-Control: no-store, no-cache, must-revalidate');
                header('Expires: Sun, 1 Jan 2000 12:00:00 GMT');
                header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');
                header('Content-type: audio/x-wav');

                if (extension_loaded('zlib')) {
                    ini_set('zlib.output_compression', true);  // compress output if supported by browser
                } else {
                    header('Content-Length: ' . strlen($audio));
                }
            }

            echo $audio;
        } else {
            echo '<hr /><strong>'
                .'Failed to generate audio file, content has already been '
                .'output.<br />This is most likely due to misconfiguration or '
                .'a PHP error was sent to the browser.</strong>';
        }

        restore_error_handler();

        if (!$this->no_exit) exit;
    }

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purgeOldCodesFromDatabase()

Securimage::purgeOldCodesFromDatabase ( )

protected

Deletes old codes from sqlite database.

Definition at line 1882 of file securimage.php.

References $query, $result, and time.

Referenced by openDatabase().

    {
        if ($this->use_database && $this->pdo_conn) {
            $now   = time();
            $limit = (!is_numeric($this->expiry_time) || $this->expiry_time < 1) ? 86400 : $this->expiry_time;

            $query = sprintf("DELETE FROM %s WHERE %s - created > %s",
                             $this->database_table,
                             $this->pdo_conn->quote($now, PDO::PARAM_INT),
                             $this->pdo_conn->quote($limit, PDO::PARAM_INT));

            $result = $this->pdo_conn->query($query);
        }
    }

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readCodeFromFile()

Securimage::readCodeFromFile (   $numWords = 1 )

protected

Gets a captcha code from a wordlist.

Definition at line 1456 of file securimage.php.

References $data, $end, $i, and array.

Referenced by createCode().

    {
        $fp = fopen($this->wordlist_file, 'rb');
        if (!$fp) return false;

        $fsize = filesize($this->wordlist_file);
        if ($fsize < 128) return false; // too small of a list to be effective

        if ((int)$numWords < 1 || (int)$numWords > 5) $numWords = 1;

        $words = array();
        $i = 0;
        do {
            fseek($fp, mt_rand(0, $fsize - 64), SEEK_SET); // seek to a random position of file from 0 to filesize-64
            $data = fread($fp, 64); // read a chunk from our random position
            $data = preg_replace("/\r?\n/", "\n", $data);

            $start = @strpos($data, "\n", mt_rand(0, 56)) + 1; // random start position
            $end   = @strpos($data, "\n", $start);          // find end of word

            if ($start === false) {
                // picked start position at end of file
                continue;
            } else if ($end === false) {
                $end = strlen($data);
            }

            $word = strtolower(substr($data, $start, $end - $start)); // return a line of the file
            $words[] = $word;
        } while (++$i < $numWords);

        fclose($fp);

        if ($numWords < 2) {
            return $words[0];
        } else {
            return $words;
        }
    }

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saveCodeToDatabase()

Securimage::saveCodeToDatabase ( )

protected

Saves the code to the sqlite database.

Definition at line 1584 of file securimage.php.

References $_SERVER, $code, $code_display, $id, $query, $success, $time, array, clearCodeFromDatabase(), getCaptchaId(), openDatabase(), and time.

Referenced by saveData().

    {
        $success = false;
        $this->openDatabase();

        if ($this->use_database && $this->pdo_conn) {
            $id = $this->getCaptchaId(false);
            $ip = $_SERVER['REMOTE_ADDR'];

            if (empty($id)) {
                $id = $ip;
            }

            $time      = time();
            $code      = $this->code;
            $code_disp = $this->code_display;

            // This is somewhat expensive in PDO Sqlite3 (when there is something to delete)
            $this->clearCodeFromDatabase();

            $query = "INSERT INTO {$this->database_table} ("
                    ."id, code, code_display, namespace, created) "
                    ."VALUES(?, ?, ?, ?, ?)";

            $stmt    = $this->pdo_conn->prepare($query);
            $success = $stmt->execute(array($id, $code, $code_disp, $this->namespace, $time));

            if (!$success) {
                $err = $stmt->errorInfo();
                trigger_error("Failed to insert code into database. {$err[1]}: {$err[2]}", E_USER_WARNING);
            }
        }

        return $success !== false;
    }

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saveData()

Securimage::saveData ( )

protected

Save data to session namespace and database if used.

Definition at line 1562 of file securimage.php.

References $_SESSION, $code, $code_display, $namespace, saveCodeToDatabase(), and time.

Referenced by createCode().

    {
        if ($this->no_session != true) {
            if (isset($_SESSION['securimage_code_value']) && is_scalar($_SESSION['securimage_code_value'])) {
                // fix for migration from v2 - v3
                unset($_SESSION['securimage_code_value']);
                unset($_SESSION['securimage_code_ctime']);
            }

            $_SESSION['securimage_code_disp'] [$this->namespace] = $this->code_display;
            $_SESSION['securimage_code_value'][$this->namespace] = $this->code;
            $_SESSION['securimage_code_ctime'][$this->namespace] = time();
        }

        if ($this->use_database) {
            $this->saveCodeToDatabase();
        }
    }

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setBackground()

Securimage::setBackground ( )

protected

The the background color, or background image to be used.

Definition at line 1066 of file securimage.php.

References $img, and getBackgroundFromDirectory().

Referenced by doImage().

    {
        // set background color of image by drawing a rectangle since imagecreatetruecolor doesn't set a bg color
        imagefilledrectangle($this->im, 0, 0,
                             $this->image_width, $this->image_height,
                             $this->gdbgcolor);
        imagefilledrectangle($this->tmpimg, 0, 0,
                             $this->image_width * $this->iscale, $this->image_height * $this->iscale,
                             $this->gdbgcolor);

        if ($this->bgimg == '') {
            if ($this->background_directory != null &&
                is_dir($this->background_directory) &&
                is_readable($this->background_directory))
            {
                $img = $this->getBackgroundFromDirectory();
                if ($img != false) {
                    $this->bgimg = $img;
                }
            }
        }

        if ($this->bgimg == '') {
            return;
        }

        $dat = @getimagesize($this->bgimg);
        if($dat == false) {
            return;
        }

        switch($dat[2]) {
            case 1:  $newim = @imagecreatefromgif($this->bgimg); break;
            case 2:  $newim = @imagecreatefromjpeg($this->bgimg); break;
            case 3:  $newim = @imagecreatefrompng($this->bgimg); break;
            default: return;
        }

        if(!$newim) return;

        imagecopyresized($this->im, $newim, 0, 0, 0, 0,
                         $this->image_width, $this->image_height,
                         imagesx($newim), imagesy($newim));
    }

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show()

Securimage::show

(

$background_image = ''

)

Used to serve a captcha image to the browser.

Parameters

string

$background_image

The path to the background image to use $img = new Securimage(); $img->code_length = 6; $img->num_lines = 5; $img->noise_level = 5;

$img->show(); // sends the image to browser exit;

Definition at line 807 of file securimage.php.

References array, and doImage().

    {
        set_error_handler(array(&$this, 'errorHandler'));

        if($background_image != '' && is_readable($background_image)) {
            $this->bgimg = $background_image;
        }

        $this->doImage();
    }

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validate()

Securimage::validate ( )

protected

Checks the entered code against the value stored in the session or sqlite database, handles case sensitivity Also clears the stored codes if the code was entered correctly to prevent re-use.

Definition at line 1520 of file securimage.php.

References $_SESSION, $code, $namespace, clearCodeFromDatabase(), and getCode().

Referenced by check().

    {
        if (!is_string($this->code) || strlen($this->code) == 0) {
            $code = $this->getCode();
            // returns stored code, or an empty string if no stored code was found
            // checks the session and database if enabled
        } else {
            $code = $this->code;
        }

        if ($this->case_sensitive == false && preg_match('/[A-Z]/', $code)) {
            // case sensitive was set from securimage_show.php but not in class
            // the code saved in the session has capitals so set case sensitive to true
            $this->case_sensitive = true;
        }

        $code_entered = trim( (($this->case_sensitive) ? $this->code_entered
                                                       : strtolower($this->code_entered))
                        );
        $this->correct_code = false;

        if ($code != '') {
            if (strpos($code, ' ') !== false) {
                // for multi word captchas, remove more than once space from input
                $code_entered = preg_replace('/\s+/', ' ', $code_entered);
                $code_entered = strtolower($code_entered);
            }

            if ($code == $code_entered) {
                $this->correct_code = true;
                if ($this->no_session != true) {
                    $_SESSION['securimage_code_value'][$this->namespace] = '';
                    $_SESSION['securimage_code_ctime'][$this->namespace] = '';
                }
                $this->clearCodeFromDatabase();
            }
        }
    }

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Field Documentation

$_captchaId

Securimage::$_captchaId = null

staticprotected

Definition at line 539 of file securimage.php.

Referenced by __construct(), clearCodeFromDatabase(), getCaptchaId(), and getCodeFromDatabase().

$audio_gap_max

Securimage::$audio_gap_max = 600

Definition at line 533 of file securimage.php.

$audio_gap_min

Securimage::$audio_gap_min = 0

Definition at line 526 of file securimage.php.

$audio_mix_normalization

Securimage::$audio_mix_normalization = 0.6

Definition at line 511 of file securimage.php.

Referenced by generateWAV().

$audio_noise_path

Securimage::$audio_noise_path

Definition at line 479 of file securimage.php.

$audio_path

Securimage::$audio_path

Definition at line 472 of file securimage.php.

$audio_use_noise

Securimage::$audio_use_noise

Definition at line 489 of file securimage.php.

$background_directory

Securimage::$background_directory

Definition at line 458 of file securimage.php.

$bgimg

Securimage::$bgimg

protected

Definition at line 543 of file securimage.php.

$captcha_code

Securimage::$captcha_code

protected

Definition at line 577 of file securimage.php.

$captcha_type

Securimage::$captcha_type = self::SI_CAPTCHA_STRING

Definition at line 425 of file securimage.php.

$case_sensitive

Securimage::$case_sensitive = false

Definition at line 284 of file securimage.php.

Referenced by createCode(), and doImage().

$charset

Securimage::$charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789'

Definition at line 289 of file securimage.php.

$code

Securimage::$code

protected

Definition at line 553 of file securimage.php.

Referenced by check(), checkByCaptchaId(), createCode(), doImage(), generateCode(), getAudibleCode(), getCode(), getCodeFromDatabase(), saveCodeToDatabase(), saveData(), and validate().

$code_display

Securimage::$code_display

protected

Definition at line 560 of file securimage.php.

Referenced by saveCodeToDatabase(), and saveData().

$code_length

Securimage::$code_length = 6

Definition at line 279 of file securimage.php.

Referenced by generateCode().

$database_driver

Securimage::$database_driver = self::SI_DRIVER_SQLITE3

Definition at line 367 of file securimage.php.

$database_file

Securimage::$database_file

Definition at line 418 of file securimage.php.

Referenced by getDsn().

$database_host

Securimage::$database_host = 'localhost'

Definition at line 376 of file securimage.php.

$database_name

Securimage::$database_name = ''

Definition at line 400 of file securimage.php.

$database_pass

Securimage::$database_pass = ''

Definition at line 392 of file securimage.php.

$database_table

Securimage::$database_table = 'captcha_codes'

Definition at line 409 of file securimage.php.

$database_user

Securimage::$database_user = ''

Definition at line 384 of file securimage.php.

$degrade_audio

Securimage::$degrade_audio

Definition at line 519 of file securimage.php.

$display_value

Securimage::$display_value

Definition at line 570 of file securimage.php.

Referenced by doImage().

$expiry_time

Securimage::$expiry_time = 900

Definition at line 294 of file securimage.php.

$gdbgcolor

Securimage::$gdbgcolor

protected

Definition at line 608 of file securimage.php.

$gdlinecolor

Securimage::$gdlinecolor

protected

Definition at line 610 of file securimage.php.

$gdsignaturecolor

Securimage::$gdsignaturecolor

protected

Definition at line 611 of file securimage.php.

$gdtextcolor

Securimage::$gdtextcolor

protected

Definition at line 609 of file securimage.php.

$im

Securimage::$im

protected

Definition at line 541 of file securimage.php.

$image_bg_color

Securimage::$image_bg_color = '#ffffff'

Definition at line 247 of file securimage.php.

$image_height

Securimage::$image_height = 80

Definition at line 236 of file securimage.php.

Referenced by distortedCopy().

$image_signature

Securimage::$image_signature = ''

Definition at line 329 of file securimage.php.

$image_type

Securimage::$image_type = self::SI_IMAGE_PNG

Definition at line 241 of file securimage.php.

$image_width

Securimage::$image_width = 215

Definition at line 231 of file securimage.php.

Referenced by distortedCopy(), and drawLines().

$iscale

Securimage::$iscale = 5

protected

Definition at line 544 of file securimage.php.

Referenced by distortedCopy(), drawNoise(), and drawWord().

$line_color

Securimage::$line_color = '#707070'

Definition at line 257 of file securimage.php.

$namespace

Securimage::$namespace

Definition at line 442 of file securimage.php.

Referenced by getCode(), getCodeFromDatabase(), saveData(), and validate().

$no_exit

Securimage::$no_exit

protected

Definition at line 584 of file securimage.php.

$no_session

Securimage::$no_session

protected

Definition at line 591 of file securimage.php.

$noise_color

Securimage::$noise_color = '#707070'

Definition at line 262 of file securimage.php.

$noise_level

Securimage::$noise_level = 2

Definition at line 323 of file securimage.php.

Referenced by drawNoise().

$num_lines

Securimage::$num_lines = 5

Definition at line 318 of file securimage.php.

Referenced by drawLines().

$pdo_conn

Securimage::$pdo_conn

protected

Definition at line 605 of file securimage.php.

Referenced by openDatabase().

$perturbation

Securimage::$perturbation = 0.85

Definition at line 313 of file securimage.php.

$securimage_path

Securimage::$securimage_path = null

Definition at line 546 of file securimage.php.

$send_headers

Securimage::$send_headers

protected

Definition at line 598 of file securimage.php.

$session_name

Securimage::$session_name = null

Definition at line 301 of file securimage.php.

$signature_color

Securimage::$signature_color = '#707070'

Definition at line 334 of file securimage.php.

$signature_font

Securimage::$signature_font

Definition at line 339 of file securimage.php.

$sqlite_database

Securimage::$sqlite_database

Definition at line 464 of file securimage.php.

$text_color

Securimage::$text_color = '#707070'

Definition at line 252 of file securimage.php.

$text_transparency_percentage

Securimage::$text_transparency_percentage = 20

Definition at line 268 of file securimage.php.

$tmpimg

Securimage::$tmpimg

protected

Definition at line 542 of file securimage.php.

$ttf_file

Securimage::$ttf_file

Definition at line 448 of file securimage.php.

Referenced by __construct().

$use_database

Securimage::$use_database = false

Definition at line 358 of file securimage.php.

$use_sqlite_db

Securimage::$use_sqlite_db = false

Definition at line 348 of file securimage.php.

$use_transparent_text

Securimage::$use_transparent_text = true

Definition at line 273 of file securimage.php.

$use_wordlist

Securimage::$use_wordlist = false

Definition at line 307 of file securimage.php.

$wordlist_file

Securimage::$wordlist_file

Definition at line 453 of file securimage.php.

SI_CAPTCHA_MATHEMATIC

const Securimage::SI_CAPTCHA_MATHEMATIC = 1

Definition at line 196 of file securimage.php.

SI_CAPTCHA_STRING

const Securimage::SI_CAPTCHA_STRING = 0

Definition at line 191 of file securimage.php.

SI_CAPTCHA_WORDS

const Securimage::SI_CAPTCHA_WORDS = 2

Definition at line 201 of file securimage.php.

SI_DRIVER_MYSQL

const Securimage::SI_DRIVER_MYSQL = 'mysql'

Definition at line 208 of file securimage.php.

SI_DRIVER_PGSQL

const Securimage::SI_DRIVER_PGSQL = 'pgsql'

Definition at line 215 of file securimage.php.

SI_DRIVER_SQLITE3

const Securimage::SI_DRIVER_SQLITE3 = 'sqlite'

Definition at line 222 of file securimage.php.

SI_IMAGE_GIF

const Securimage::SI_IMAGE_GIF = 3

Definition at line 185 of file securimage.php.

SI_IMAGE_JPEG

const Securimage::SI_IMAGE_JPEG = 1

Definition at line 175 of file securimage.php.

SI_IMAGE_PNG

const Securimage::SI_IMAGE_PNG = 2

Definition at line 180 of file securimage.php.

---

The documentation for this class was generated from the following file:

• Services/Captcha/lib/securimage_3_5_1/securimage.php