├── LICENSE
├── README.md
├── captcha-generator
    ├── asset
    │   ├── main.js
    │   └── redo-alt-solid.svg
    ├── captcha.php
    ├── fonts
    │   ├── 1.ttf
    │   ├── 10.ttf
    │   ├── 2.ttf
    │   ├── 3.ttf
    │   ├── 4.ttf
    │   ├── 5.ttf
    │   ├── 6.ttf
    │   ├── 7.ttf
    │   ├── 8.ttf
    │   └── 9.ttf
    └── img_gen.php
├── example.php
├── screenshot
    ├── img0.png
    └── img1.png
└── validate.php


/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 Tarun Kumar
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | Captcha Generator [![license](https://img.shields.io/github/license/mashape/apistatus.svg?maxAge=2592000)](https://github.com/tarunk04/Captcha_Generator/blob/master/LICENSE)
 2 | =================
 3 | 
 4 | It is a simple PHP program to generate captcha for form validation. It can be integrated in any website for captcha generation. This project is based on converting text to image using PHP with help of GD. It create 4 character and converts it to image.
 5 | 
 6 | Silent Features 
 7 | ================
 8 | * Each 4 character have different font , random font from the set of 10 fonts. 
 9 | * Each character has different colour, font size, orientation and position 
10 | * Final captcha has many lines with different orientation, size, position and colour.<br>
11 | ![g](/screenshot/img0.png)  ![g](/screenshot/img1.png)
12 | 
13 | Installation
14 | ================
15 | * Clone this repository:  
16 | 	```console
17 | 	git clone https://github.com/tarunk04/Captcha_Generator
18 | 	```
19 | 	or click `Download ZIP` in right panel of repository and extract it.
20 | * Copy `captcha-generator` folder into the project directory.
21 | * Copy this line to HTML or PHP file of the project.
22 | 	```html
23 | 	<div id="ae_captcha_api"></div>
24 | 	```
25 | * Copy this script import line at the bottom of the body of same HTML or PHP file.
26 | 	```html
27 | 	<script src="./captcha-generator/asset/main.js"></script>
28 | 	```
29 | Validating captcha 
30 | ===================
31 | * Create a form with a `Text Field` and `Button` to send the user input to server using `POST` method.
32 | * On server side use session variable `$_SESSION['secure']` for validating captch. For example:
33 | 	```php
34 | 	<?php 
35 | 		session_start();
36 | 		if($_SESSION['secure'] == $_POST['user_input']){
37 | 		  echo "captcha validated.";
38 | 		} 
39 | 		else{
40 | 		  echo "captcha validation failed.";
41 | 		}
42 | 	?>
43 | 	```
44 | ---------------------------------------------
45 | 


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/captcha-generator/asset/main.js:
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 1 | 
 2 | document.getElementById('ae_captcha_api').innerHTML = "<div style='float: left ; height : 60px; width:200px; min-width: 170px;' id='divcaptcha'><img src='./captcha-generator/img_gen.php'></div><a class='fa fa-refresh'  type='button' onclick='newcaptcha()'><button>Refresh</button></a>";
 3 | 
 4 | function newcaptcha(){
 5 |   var dataString = 'index=1';
 6 |   var url = "./captcha-generator/captcha.php"
 7 |   var xhttp = new XMLHttpRequest();
 8 |   xhttp.onreadystatechange = function() {
 9 |     if (this.readyState == 4 && this.status == 200) {
10 |       html = this.responseText;
11 |       if (html!=1){
12 |         document.getElementById('divcaptcha').innerHTML = html;
13 |       }
14 |     }
15 |   };
16 |   xhttp.open("POST", url, true);
17 |   xhttp.send();
18 | }
19 | 


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/captcha-generator/asset/redo-alt-solid.svg:
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1 | <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="redo-alt" class="svg-inline--fa fa-redo-alt fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256.455 8c66.269.119 126.437 26.233 170.859 68.685l35.715-35.715C478.149 25.851 504 36.559 504 57.941V192c0 13.255-10.745 24-24 24H345.941c-21.382 0-32.09-25.851-16.971-40.971l41.75-41.75c-30.864-28.899-70.801-44.907-113.23-45.273-92.398-.798-170.283 73.977-169.484 169.442C88.764 348.009 162.184 424 256 424c41.127 0 79.997-14.678 110.629-41.556 4.743-4.161 11.906-3.908 16.368.553l39.662 39.662c4.872 4.872 4.631 12.815-.482 17.433C378.202 479.813 319.926 504 256 504 119.034 504 8.001 392.967 8 256.002 7.999 119.193 119.646 7.755 256.455 8z"></path></svg>


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/captcha-generator/captcha.php:
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 1 | <?php
 2 | //GENERATING RANDOM 4 CHARACTER FOR CAPTCHA
 3 |   $string='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefhijklmnopqrstuvwxyz1234567890';
 4 |   $string_shuff=str_shuffle($string);
 5 |   $text=substr($string_shuff,0,4);
 6 | 
 7 | //STARTING AND CREATING SESSION
 8 |   session_start();
 9 |   $_SESSION['secure']=$text;
10 | ?>
11 | <div style="width: 158px;height: 60px;">
12 |   <img src="./captcha-generator/img_gen.php">
13 | </div>
14 | 


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/captcha-generator/fonts/1.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/1.ttf


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/captcha-generator/fonts/10.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/10.ttf


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/captcha-generator/fonts/2.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/2.ttf


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/captcha-generator/fonts/3.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/3.ttf


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/captcha-generator/fonts/4.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/4.ttf


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/captcha-generator/fonts/5.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/5.ttf


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/captcha-generator/fonts/6.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/6.ttf


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/captcha-generator/fonts/7.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/7.ttf


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/captcha-generator/fonts/8.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/8.ttf


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/captcha-generator/fonts/9.ttf:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/captcha-generator/fonts/9.ttf


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/captcha-generator/img_gen.php:
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 1 | <?php
 2 | //STARTING  SESSION
 3 |   //GENERATING RANDOM 4 CHARACTER FOR CAPTCHA
 4 |     $string='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefhijklmnopqrstuvwxyz1234567890';
 5 |     $string_shuff=str_shuffle($string);
 6 |     $text=substr($string_shuff,0,4);
 7 | 
 8 |   //STARTING AND CREATING SESSION
 9 |     session_start();
10 |     $_SESSION['secure']=$text;
11 | //DEFINING CONTENT TYPE TO IMAGE - JPEG
12 |   header('content-type: image/jpeg');
13 | //GETTING SESSION VARIABLE
14 |   $text=$_SESSION['secure'];
15 | 
16 | //CREATING IMAGE WITH DIMENTION 158x60
17 |   $image_height=60;
18 |   $image_width=(32*4)+30;
19 |   $image = imagecreate($image_width, $image_height);
20 |   //DEFINING BACKGROUND COLOUR TO WHITE
21 |   imagecolorallocate($image, 255 ,255, 255);
22 | 
23 | 
24 | //FOR LOOP FOR CREATING TEXT
25 |   for ($i=1; $i<=4;$i++){
26 |     //CREATING RANDOM FONT-SIZE
27 |       $font_size=rand(22,27);
28 |     //FOR RANDOM COLOUR
29 |       $r=rand(0,255);
30 |       $g=rand(0,255);
31 |       $b=rand(0,255);
32 |     //RANDOM INDEX FOR RANDOM TEXT FONT
33 |       $index=rand(1,10);
34 |     //RANDOM POSITION AND ORIANTION
35 |       $x=15+(30*($i-1));
36 |       $x=rand($x-5,$x+5);
37 |       $y=rand(35,45);
38 |       $o=rand(-30,30);
39 |     //RANDOM FONT COLOR
40 |       $font_color = imagecolorallocate($image, $r ,$g, $b);
41 |     //CREATING IMAGE USING DIFFETENT FONTS
42 |       imagettftext($image, $font_size, $o, $x, $y ,  $font_color,'fonts/'.$index.'.ttf',$text[$i-1]);
43 |   }
44 | //FOR LOOP FOR CREATING RANDOM LINES
45 |   for($i=1; $i<=30;$i++){
46 |     //RANDOM STARTING AND ENDING POSITION
47 |       $x1= rand(1,150);
48 |       $y1= rand(1,150);
49 |       $x2= rand(1,150);
50 |       $y2= rand(1,150);
51 |     //RANDOM COLOR
52 |       $r=rand(0,255);
53 |       $g=rand(0,255);
54 |       $b=rand(0,255);
55 |       $font_color = imagecolorallocate($image, $r ,$g, $b);
56 |     //CREATING RANDOM LINES
57 |       imageline($image,$x1,$y1,$x2,$y2,$font_color);
58 | 
59 | 
60 |   }
61 | //CREATING FINAL IMAGE (CAPTCHA)
62 |   imagejpeg($image);
63 | 
64 | ?>
65 | 


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/example.php:
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 1 | <!DOCTYPE html>
 2 | <html lang="en" dir="ltr">
 3 |   <head>
 4 |     <meta charset="utf-8">
 5 |     <title>Example Captcha</title>
 6 |   </head>
 7 |   <body>
 8 |     <form method = "POST" >
 9 | 		<div id="ae_captcha_api"></div>
10 | 		<div><input type="text" placeholder = "Enter Captcha" name="user_input"/></div>
11 | 		<div><input type="submit" formaction="./validate.php" value = "Submit"/></div>
12 | 	</form>
13 | 	<script src="./captcha-generator/asset/main.js"></script>
14 |   </body>
15 | </html>
16 | 


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/screenshot/img0.png:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/screenshot/img0.png


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/screenshot/img1.png:
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https://raw.githubusercontent.com/tarunk04/Captcha_Generator/4f710a6a52a8c8c8f78d6b6b7fc317d0beb6411a/screenshot/img1.png


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/validate.php:
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1 | <?php 
2 | 	session_start();
3 | 	if($_SESSION['secure'] == $_POST['user_input']){
4 | 	  echo "captcha validated.";
5 | 	} 
6 | 	else{
7 | 	  echo "captcha validation failed.";
8 | 	}
9 | ?>


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