Protéger image à l'aide de php

addhandler WaterMark2 jpg
action WaterMark2 /galleriephoto/WaterMark2.php

<?php
/*
    WATERMARK_TYPE
        Type de watermark         
        Valeurs: 'text' | 'image'

    WATERMARK_ALIGN_H
        Alignment horizontal         
        Valeurs: 'left' | 'right' | 'center'

    WATERMARK_ALIGN_V
        Alignment vertical        
        Valeurs: 'top' | 'bottom' | 'center'
        
    WATERMARK_MARGIN
        Excentrage à partir du bord.
        Valeurs: (en pixels)
*/

    define('WATERMARK_TYPE', 'text'); 
    define('WATERMARK_ALIGN_H', 'center'); 
    define('WATERMARK_ALIGN_V', 'bottom'); 
    define('WATERMARK_MARGIN', '10'); 

/*
    WATERMARK_IMAGE_FILE
        Chemin vers le fichier image employé comme watermark
        Valeur possible (chemin absolu ou relatif).

    WATERMARK_OPACITY
        Opacité de l'image.
        Valeurs: entre 0 et 100
*/

    define('WATERMARK_IMAGE_FILE', './test.png');
    define('WATERMARK_OPACITY', '60'); 

/*
    WATERMARK_TEXT
        Votre texte utilisé pour le copyright.
            
    WATERMARK_TEXT_FONT
        La police.
        Valeurs: de 1 à 5
    
    WATERMARK_TEXT_SHADOW
        Police "black shadow".
        Valeurs: 'yes' | 'no'

    WATERMARK_TEXT_COLOR
        La couleur de la police
        Valeurs en décimal (ex: '255,255,255') ou  hexadécimal (ex: '#ff4567')
*/

    define('WATERMARK_TEXT', 'Copyright (c) 2007 www.visualprod.net'); 
    define('WATERMARK_TEXT_FONT', '3'); 
    define('WATERMARK_TEXT_SHADOW', 'yes'); 
    define('WATERMARK_TEXT_COLOR', '#FFFFFF');

// FIN DE LA CONFIGURATION
// Utilisateurs non averti, ne pas toucher au reste ...

    $original_image_file = $_SERVER['DOCUMENT_ROOT'] . $_SERVER['PATH_INFO'];
    $original_image_info = getimagesize($original_image_file);
    if ($original_image_info) {
        $original_image_width = $original_image_info[0];
        $original_image_height = $original_image_info[1];
        $original_image_imagetype = $original_image_info[2];
        $original_image_mime_type = $original_image_info['mime'];
    }
    else {
        header("Status: 500 Internal Server Error");
        if ($_SERVER['REQUEST_METHOD'] != 'HEAD') {
            header("Content-Type: text/plain");
            echo "WaterMark: Erreur lors de la lecture des propriétés des images de la gallerie.";
                        echo "Une ou plusieurs images sont tronquées par une signature d'entête.\n";
        }
        exit;
    }

    if ($original_image_imagetype == IMAGETYPE_GIF) {
        header("Content-Type: " . $original_image_mime_type);
        readfile($original_image_file);
        exit;
    } 
    elseif ($original_image_imagetype == IMAGETYPE_JPEG) {
        header("Content-Type: " . $original_image_mime_type);
        $source_image = imagecreatefromjpeg($original_image_file);
    } 
    elseif ($original_image_imagetype == IMAGETYPE_PNG) {
        header("Content-Type: " . $original_image_mime_type);
        $source_image = imagecreatefrompng($original_image_file);
    }
    else {
        header("Status: 500 Internal Server Error");
        if ($_SERVER['REQUEST_METHOD'] != 'HEAD') {
            header("Content-Type: text/plain");
            echo "WaterMark: format d'image non supporté\n";
        }
        exit;
    }

    if (WATERMARK_TYPE == 'image' && WATERMARK_IMAGE_FILE != '' 
    && file_exists(WATERMARK_IMAGE_FILE)) {

        $watermark_image_file = realpath(WATERMARK_IMAGE_FILE);

        $watermark_image_info = getimagesize($watermark_image_file);
        if ($original_image_info) {
            $watermark_image_width = $watermark_image_info[0];
            $watermark_image_height = $watermark_image_info[1];
            $watermark_image_imagetype = $watermark_image_info[2];
            $watermark_image_mime_type = $watermark_image_info['mime'];
        }
        else {
            header("Status: 500 Internal Server Error");
            if ($_SERVER['REQUEST_METHOD'] != 'HEAD') {
                header("Content-Type: text/plain");
                echo "WaterMark: Erreur lors de a lecture des propriétés de l'image à incruster.";
                                echo "L'image est tronquée par une signature d'entête.\n";
            }
            exit;
        }

        if ($watermark_image_imagetype == IMAGETYPE_JPEG) {
            $watermark_image = imagecreatefromjpeg(WATERMARK_IMAGE_FILE);
        } 
        elseif ($watermark_image_imagetype == IMAGETYPE_PNG) {
            $watermark_image = imagecreatefrompng(WATERMARK_IMAGE_FILE);
        }

        if ($watermark_image) {

            $watermark_y = WATERMARK_MARGIN;
            if (WATERMARK_ALIGN_V == 'top') {
                $watermark_y = WATERMARK_MARGIN;
            } 
            elseif (WATERMARK_ALIGN_V == 'bottom') {
                $watermark_y = $original_image_height - $watermark_image_height - WATERMARK_MARGIN;
            } 
            elseif (WATERMARK_ALIGN_V == 'center') {
                $watermark_y = (int)($original_image_height / 2 - $watermark_image_height / 2);
            }

            $watermark_x = WATERMARK_MARGIN;        
            if (WATERMARK_ALIGN_H == 'left') {
                $watermark_x = WATERMARK_MARGIN;
            } 
            elseif (WATERMARK_ALIGN_H == 'right') {
                $watermark_x = $original_image_width - $watermark_image_width - WATERMARK_MARGIN;
            } 
            elseif (WATERMARK_ALIGN_H == 'center') {
                $watermark_x = (int)($original_image_width / 2 - $watermark_image_width / 2);
            }

            imagecopymerge(
                $source_image, 
                $watermark_image, 
                $watermark_x, $watermark_y,
                0, 0, 
                $watermark_image_width, $watermark_image_height,
                WATERMARK_OPACITY
            );    
        }
    }
    elseif (WATERMARK_TYPE == 'text' && WATERMARK_TEXT != '') {

        $color = WATERMARK_TEXT_COLOR;
        $red = hexdec(substr($color, 1, 2));
        $green = hexdec(substr($color, 3, 2));
        $blue = hexdec(substr($color, 5, 2));        
        $text_color = imagecolorallocate($source_image, $red, $green, $blue); 
        $shadow_color = imagecolorallocate($source_image, 0, 0, 0); 
        $text_height = imagefontheight(WATERMARK_TEXT_FONT);
        $text_width = strlen(WATERMARK_TEXT) * imagefontwidth(WATERMARK_TEXT_FONT);

        $watermark_y = WATERMARK_MARGIN;
        if (WATERMARK_ALIGN_V == 'top') {
            $watermark_y = WATERMARK_MARGIN;
        }
        elseif (WATERMARK_ALIGN_V == 'bottom') {
            $watermark_y = $original_image_height - $text_height - WATERMARK_MARGIN;
        }
        elseif (WATERMARK_ALIGN_V == 'center') {
            $watermark_y = (int)($original_image_height / 2 - $text_height / 2);
          }

        $watermark_x = WATERMARK_MARGIN;
        if (WATERMARK_ALIGN_H == 'left') {
            $watermark_x = WATERMARK_MARGIN;
        }
        elseif (WATERMARK_ALIGN_H == 'right') {
            $watermark_x = $original_image_width - $text_width - WATERMARK_MARGIN;
        }
        elseif (WATERMARK_ALIGN_H == 'center') {
            $watermark_x = (int)($original_image_width / 2 - $text_width / 2);
        }

        if (WATERMARK_TEXT_SHADOW == 'yes') {
            imagestring(
                $source_image, 
                WATERMARK_TEXT_FONT, 
                $watermark_x + 1, $watermark_y + 1, 
                WATERMARK_TEXT, 
                $shadow_color
            );
        }
        imagestring(
            $source_image, 
            WATERMARK_TEXT_FONT, 
            $watermark_x, $watermark_y,
            WATERMARK_TEXT,
            $text_color
        );

    }
    else {
        header("Status: 500 Internal Server Error");
        if ($_SERVER['REQUEST_METHOD'] != 'HEAD') {
            header("Content-Type: text/plain");                
            echo "WaterMark: Erreur de configuration\n";
        }
        exit;
    }

    if ($original_image_imagetype == IMAGETYPE_JPEG) {
        imagejpeg($source_image);
    }
    elseif ($original_image_format == IMAGETYPE_PNG) {
        imagepng($source_image);
    }    
?>