| 1 | <?php
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| 2 |
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| 3 | /*
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| 4 | * This class is taken in part from the Code of
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| 5 | * PhpCaptcha CAPTCHA generation library from Edward Eliot.
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| 6 | * class defaults - change to effect globally
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| 7 | */
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| 8 | session_start();
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| 9 | define('CAPCC_WIDTH', 120); // max 500
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| 10 | define('CAPCC_HEIGHT', 50); // max 200
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| 11 | define('CAPCC_NUM_CHARS', 4);
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| 12 | define('CAPCC_NUM_LINES', 20);
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| 13 | define('CAPCC_CHAR_SHADOW', false);
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| 14 | define('CAPCC_CHAR_SET', ''); // defaults to A-Z
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| 15 | define('CAPCC_CASE_INSENSITIVE', true);
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| 16 | define('CAPCC_BACKGROUND_IMAGES', '');
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| 17 | define('CAPCC_MIN_FONT_SIZE', 12);
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| 18 | define('CAPCC_MAX_FONT_SIZE', 20);
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| 19 | define('CAPCC_USE_COLOUR', true);
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| 20 | define('CAPCC_FILE_TYPE', 'png');
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| 21 |
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| 22 | /************************ End Default Options **********************/
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| 23 |
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| 24 | // don't edit below this line (unless you want to change the class!)
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| 25 |
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| 26 | class _odl_captcha {
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| 27 | var $oImage;
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| 28 | var $iWidth = CAPCC_WIDTH;
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| 29 | var $iHeight = CAPCC_HEIGHT;
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| 30 | var $aFonts;
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| 31 | var $iNumChars;
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| 32 | var $iNumLines;
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| 33 | var $iSpacing;
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| 34 | var $bCharShadow;
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| 35 | var $aCharSet;
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| 36 | var $bCaseInsensitive;
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| 37 | var $vBackgroundImages;
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| 38 | var $iMinFontSize;
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| 39 | var $iMaxFontSize;
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| 40 | var $bUseColour;
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| 41 | var $sFileType;
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| 42 | var $sCode = '';
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| 43 |
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| 44 |
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| 45 | function _odl_captcha($aFonts) {
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| 46 | // get parameters
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| 47 | $this->aFonts = $aFonts;
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| 48 | $this->SetNumChars(CAPCC_NUM_CHARS);
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| 49 | $this->SetNumLines(CAPCC_NUM_LINES);
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| 50 | $this->DisplayShadow(CAPCC_CHAR_SHADOW);
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| 51 | $this->SetCharSet(CAPCC_CHAR_SET);
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| 52 | $this->CaseInsensitive(CAPCC_CASE_INSENSITIVE);
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| 53 | $this->SetBackgroundImages(CAPCC_BACKGROUND_IMAGES);
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| 54 | $this->SetMinFontSize(CAPCC_MIN_FONT_SIZE);
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| 55 | $this->SetMaxFontSize(CAPCC_MAX_FONT_SIZE);
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| 56 | $this->UseColour(CAPCC_USE_COLOUR);
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| 57 | $this->SetFileType(CAPCC_FILE_TYPE);
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| 58 | $this->SetWidth(CAPCC_WIDTH);
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| 59 | $this->SetHeight(CAPCC_HEIGHT);
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| 60 | }
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| 61 |
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| 62 | function CalculateSpacing() {
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| 63 | $this->iSpacing = (int)($this->iWidth / $this->iNumChars);
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| 64 | }
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| 65 |
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| 66 | function SetWidth($iWidth) {
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| 67 | $this->iWidth = $iWidth;
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| 68 | if ($this->iWidth > 500) $this->iWidth = 500; // to prevent perfomance impact
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| 69 | $this->CalculateSpacing();
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| 70 | }
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| 71 |
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| 72 | function SetHeight($iHeight) {
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| 73 | $this->iHeight = $iHeight;
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| 74 | if ($this->iHeight > 200) $this->iHeight = 200; // to prevent performance impact
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| 75 | }
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| 76 |
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| 77 | function SetNumChars($iNumChars) {
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| 78 | $this->iNumChars = $iNumChars;
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| 79 | $this->CalculateSpacing();
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| 80 | }
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| 81 |
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| 82 | function SetNumLines($iNumLines) {
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| 83 | $this->iNumLines = $iNumLines;
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| 84 | }
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| 85 |
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| 86 | function DisplayShadow($bCharShadow) {
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| 87 | $this->bCharShadow = $bCharShadow;
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| 88 | }
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| 89 |
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| 90 |
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| 91 | function SetCharSet($vCharSet) {
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| 92 | // check for input type
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| 93 | if (is_array($vCharSet)) {
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| 94 | $this->aCharSet = $vCharSet;
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| 95 | } else {
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| 96 | if ($vCharSet != '') {
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| 97 | // split items on commas
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| 98 | $aCharSet = explode(',', $vCharSet);
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| 99 | // initialise array
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| 100 | $this->aCharSet = array();
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| 101 | // loop through items
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| 102 | foreach ($aCharSet as $sCurrentItem) {
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| 103 | // a range should have 3 characters, otherwise is normal character
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| 104 | if (strlen($sCurrentItem) == 3) {
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| 105 | // split on range character
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| 106 | $aRange = explode('-', $sCurrentItem);
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| 107 | // check for valid range
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| 108 | if (count($aRange) == 2 && $aRange[0] < $aRange[1]) {
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| 109 | // create array of characters from range
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| 110 | $aRange = range($aRange[0], $aRange[1]);
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| 111 | // add to charset array
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| 112 | $this->aCharSet = array_merge($this->aCharSet, $aRange);
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| 113 | }
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| 114 | } else {
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| 115 | $this->aCharSet[] = $sCurrentItem;
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| 116 | }
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| 117 | }
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| 118 | }
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | function CaseInsensitive($bCaseInsensitive) {
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| 123 | $this->bCaseInsensitive = $bCaseInsensitive;
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| 124 | }
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| 125 |
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| 126 | function SetBackgroundImages($vBackgroundImages) {
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| 127 | $this->vBackgroundImages = $vBackgroundImages;
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| 128 | }
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| 129 |
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| 130 | function SetMinFontSize($iMinFontSize) {
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| 131 | $this->iMinFontSize = $iMinFontSize;
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| 132 | }
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| 133 |
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| 134 | function SetMaxFontSize($iMaxFontSize) {
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| 135 | $this->iMaxFontSize = $iMaxFontSize;
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| 136 | }
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| 137 |
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| 138 | function UseColour($bUseColour) {
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| 139 | $this->bUseColour = $bUseColour;
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| 140 | }
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| 141 |
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| 142 | function SetFileType($sFileType) {
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| 143 | // check for valid file type
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| 144 | if (in_array($sFileType, array('gif', 'png', 'jpeg'))) {
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| 145 | $this->sFileType = $sFileType;
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| 146 | } else {
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| 147 | $this->sFileType = 'jpeg';
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | function DrawLines() {
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| 152 | for ($i = 0; $i < $this->iNumLines; $i++) {
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| 153 | // allocate colour
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| 154 | if ($this->bUseColour) {
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| 155 | $iLineColour = imagecolorallocate($this->oImage, rand(100, 250), rand(100, 250), rand(100, 250));
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| 156 | } else {
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| 157 | $iRandColour = rand(100, 250);
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| 158 | $iLineColour = imagecolorallocate($this->oImage, $iRandColour, $iRandColour, $iRandColour);
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| 159 | }
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| 160 | // draw line
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| 161 | imageline($this->oImage, rand(0, $this->iWidth), rand(0, $this->iHeight), rand(0, $this->iWidth), rand(0, $this->iHeight), $iLineColour);
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| 162 | }
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| 163 | }
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| 164 |
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| 165 | function GenerateCode() {
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| 166 | // reset code
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| 167 | $this->sCode = '';
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| 168 | // loop through and generate the code letter by letter
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| 169 | for ($i = 0; $i < $this->iNumChars; $i++) {
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| 170 | if (count($this->aCharSet) > 0) {
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| 171 | // select random character and add to code string
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| 172 | $this->sCode .= $this->aCharSet[array_rand($this->aCharSet)];
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| 173 | } else {
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| 174 | // select random character and add to code string
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| 175 | $this->sCode .= chr(rand(65, 90));
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| 176 | }
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| 177 | }
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| 178 | // save code in session variable
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| 179 | if ($this->bCaseInsensitive) {
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| 180 | $_SESSION[CAPCC_SESSION_ID] = strtoupper($this->sCode);
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| 181 | } else {
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| 182 | $_SESSION[CAPCC_SESSION_ID] = $this->sCode;
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| 183 | }
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| 184 | }
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| 185 |
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| 186 | function DrawCharacters() {
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| 187 | // loop through and write out selected number of characters
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| 188 | for ($i = 0; $i < strlen($this->sCode); $i++) {
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| 189 | // select random font
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| 190 | $sCurrentFont = $this->aFonts[array_rand($this->aFonts)];
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| 191 | // select random colour
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| 192 | if ($this->bUseColour) {
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| 193 | $iTextColour = imagecolorallocate($this->oImage, rand(0, 100), rand(0, 100), rand(0, 100));
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| 194 | if ($this->bCharShadow) {
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| 195 | // shadow colour
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| 196 | $iShadowColour = imagecolorallocate($this->oImage, rand(0, 100), rand(0, 100), rand(0, 100));
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| 197 | }
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| 198 | } else {
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| 199 | $iRandColour = rand(0, 100);
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| 200 | $iTextColour = imagecolorallocate($this->oImage, $iRandColour, $iRandColour, $iRandColour);
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| 201 | if ($this->bCharShadow) {
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| 202 | // shadow colour
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| 203 | $iRandColour = rand(0, 100);
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| 204 | $iShadowColour = imagecolorallocate($this->oImage, $iRandColour, $iRandColour, $iRandColour);
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| 205 | }
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| 206 | }
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| 207 | // select random font size
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| 208 | $iFontSize = rand($this->iMinFontSize, $this->iMaxFontSize);
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| 209 | // select random angle
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| 210 | $iAngle = rand(-30, 30);
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| 211 | // get dimensions of character in selected font and text size
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| 212 | $aCharDetails = imageftbbox($iFontSize, $iAngle, $sCurrentFont, $this->sCode[$i], array());
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| 213 | // calculate character starting coordinates
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| 214 | $iX = $this->iSpacing / 4 + $i * $this->iSpacing;
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| 215 | $iCharHeight = $aCharDetails[2] - $aCharDetails[5];
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| 216 | $iY = $this->iHeight / 2 + $iCharHeight / 4;
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| 217 | // write text to image
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| 218 | imagefttext($this->oImage, $iFontSize, $iAngle, $iX, $iY, $iTextColour, $sCurrentFont, $this->sCode[$i], array());
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| 219 | if ($this->bCharShadow) {
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| 220 | $iOffsetAngle = rand(-30, 30);
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| 221 | $iRandOffsetX = rand(-5, 5);
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| 222 | $iRandOffsetY = rand(-5, 5);
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| 223 | imagefttext($this->oImage, $iFontSize, $iOffsetAngle, $iX + $iRandOffsetX, $iY + $iRandOffsetY, $iShadowColour, $sCurrentFont, $this->sCode[$i], array());
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| 224 | }
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| 225 | }
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| 226 | }
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| 227 |
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| 228 | function create($sFilename = '') {
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| 229 | // check for required gd functions
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| 230 | if (!function_exists('imagecreate') ||
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| 231 | !function_exists("image$this->sFileType") || ($this->vBackgroundImages != '' && !function_exists('imagecreatetruecolor'))) {
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| 232 | return false;
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| 233 | }
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| 234 | // get background image if specified and copy to CAPTCHA
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| 235 | if (is_array($this->vBackgroundImages) || $this->vBackgroundImages != '') {
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| 236 | // create new image
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| 237 | $this->oImage = imagecreatetruecolor($this->iWidth, $this->iHeight);
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| 238 | // create background image
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| 239 | if (is_array($this->vBackgroundImages)) {
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| 240 | $iRandImage = array_rand($this->vBackgroundImages);
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| 241 | $oBackgroundImage = imagecreatefromjpeg($this->vBackgroundImages[$iRandImage]);
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| 242 | } else {
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| 243 | $oBackgroundImage = imagecreatefromjpeg($this->vBackgroundImages);
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| 244 | }
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| 245 | // copy background image
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| 246 | imagecopy($this->oImage, $oBackgroundImage, 0, 0, 0, 0, $this->iWidth, $this->iHeight);
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| 247 | // free memory used to create background image
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| 248 | imagedestroy($oBackgroundImage);
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| 249 | } else {
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| 250 | // create new image
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| 251 | $this->oImage = imagecreate($this->iWidth, $this->iHeight);
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| 252 | //$this->oImage = imagecreatetruecolor($this->iWidth, $this->iHeight);
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| 253 | }
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| 254 | // allocate white background colour
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| 255 | imagecolorallocate($this->oImage, 255, 255, 255);
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| 256 | // check for background image before drawing lines
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| 257 | if (!is_array($this->vBackgroundImages) && $this->vBackgroundImages == '') {
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| 258 | $this->DrawLines();
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| 259 | }
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| 260 | $this->GenerateCode();
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| 261 | $this->DrawCharacters();
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| 262 | // write out image to file or browser
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| 263 | $this->WriteFile($sFilename);
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| 264 | // free memory used in creating image
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| 265 | imagedestroy($this->oImage);
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| 266 | return true;
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| 267 | }
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| 268 |
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| 269 | function WriteFile($sFilename) {
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| 270 | if ($sFilename == '') {
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| 271 | // tell browser that data is jpeg
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| 272 | header("Content-type: image/" . $this->sFileType );
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| 273 | }
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| 274 | switch ($this->sFileType) {
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| 275 | case 'gif':
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| 276 | $sFilename != '' ? imagegif($this->oImage, $sFilename) : imagegif($this->oImage);
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| 277 | break;
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| 278 | case 'png':
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| 279 | $sFilename != '' ? imagepng($this->oImage, $sFilename) : imagepng($this->oImage);
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| 280 | break;
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| 281 | default:
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| 282 | $sFilename != '' ? imagejpeg($this->oImage, $sFilename) : imagejpeg($this->oImage);
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| 283 | }
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| 284 | }
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| 285 |
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| 286 | // call this method statically
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| 287 | function Validate($sUserCode, $bCaseInsensitive = true) {
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| 288 | if ($bCaseInsensitive) {
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| 289 | $sUserCode = strtoupper($sUserCode);
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| 290 | }
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| 291 | if (!empty($_SESSION[CAPCC_SESSION_ID]) && $sUserCode == $_SESSION[CAPCC_SESSION_ID]) {
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| 292 | // clear to prevent re-use
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| 293 | unset($_SESSION[CAPCC_SESSION_ID]);
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| 294 | return true;
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| 295 | }
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| 296 | return false;
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| 297 | }
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| 298 | }
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| 299 |
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| 300 | // example sub class
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| 301 | class _odl_captchaColour extends _odl_captcha {
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| 302 | function _odl_captchaColour($aFonts) {
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| 303 | // call parent constructor
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| 304 | parent::_odl_captcha($aFonts);
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| 305 |
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| 306 | // set options
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| 307 | $this->UseColour(true);
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| 308 | }
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| 309 | }
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| 310 | ?>
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