PHP Classes

Random key value pair authentication: Authenticate human users using random value pairs

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rndkvp 1.0.0Public Domain5.6PHP 5, User Management, Validation, S...
Description 

Author

Dave Smith

This class can authenticate human users using random value pairs.

It can generate two random strings that will be used as key-value pairs stored in the current user session variables.

The class can generate HTML for a hidden input with using the generated key as input name and the value as input value.

Then the class can validate if the user is valid checking if the submitted form values match what is stored in the session variables.

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Example

<?php
//start the sesson
session_start();
//include the class
include('rndkvp.class.php');
//instnatiate the class or load from saved object
if( empty($_SESSION['humanCheck']) ){
    $humanCheck = new rndkvp(10);
}else{
    $humanCheck = unserialize($_SESSION['humanCheck']);
}

//once form is submitted
if( !empty($_REQUEST['form-submitted']) ){

    //load request variables into system variables
    $formName = $_REQUEST['form-name'];
    $formComment = $_REQUEST['form-comment'];
    //force fail if the key is not found in the request
    $value = ( empty($_REQUEST[$humanCheck->key]) ) ? 'fail' : $_REQUEST[$humanCheck->key];

    //test system variables for errors
    $error = '';
    if( empty( $formName ) ){
        $error .= 'Please provide a Name<br>';
    }
    if( empty( $formComment ) ){
        $error .= 'Please provide a Comment<br>';
    }

    //if no errors found
    if( empty($error) ){
        //validate value submitted
        if( $humanCheck->validate( $value ) != true ){
            die('Failed human validation<br><a href="">Try Again</a>');
        }
        //validation passed, reset key value pairs
        $humanCheck->resetKVP();
        $formComment = 'Passed Human Validation'."\n";
        $formComment .= 'Testing key: '.$humanCheck->key.' and value: '.$humanCheck->value;
    }

}else{
    //set up form defaults
    $formName = '';
    $formComment = 'Testing key: '.$humanCheck->key.' and value: '.$humanCheck->value;

}

//save the object to the session
$_SESSION['humanCheck'] = serialize($humanCheck);
?>
<!DOCTYPE html>
<html>
    <head>
        <title>Random Key Value Pair Testing</title>
        <meta charset="UTF-8">
    </head>
    <body>
        <form method="POST">
<?php
if( !empty($error) ){
?>
<div style="border: thin solid red;"><?php echo $error;?></div>
<?php
}
?>
<div>Name: <input type="text" name="form-name" value="<?php echo $formName;?>"></div>
            <div>Comment:<br><textarea name="form-comment" rows="10" cols="60"><?php echo $formComment;?></textarea></div>
            <div>
                <input type="hidden" name="form-submitted" value="1">
                <?php echo $humanCheck->createFormInput();?>
<input type="submit" name="form-submit" value="Submit">
            </div>
        </form>
        <hr>
        <h4>Testing Process</h4>
        <p>1: Submit the form without entering a name. You should see an error and the key value pairs remain the same.</p>
        <p>2: Submit the form after entering a name. You should see the success and the key value pairs change. Continue to submit a few more times and see the key value pairs change.</p>
        <p>3: Refresh the page to simulate a form submission by a bot. You may need to accept the refresh warning. Validation should fail.</p>
    </body>
</html>


Details

Class: random key value pair authentication
Version: 0.1 10/14/2017

Released into the public domain

Description:

This class will authenticate human submissions through random key value pairs.

Installation:

Upload files to a web accessible location on your server (eg. public_html)


Configuration:

No configuration needed.


Usage:

This class uses a serialized object to store the last key value pair for authentication in the session.

If you don't know what I am talking about, that is okay, it just means that you must instantiate the class after the session has been started.

This allows human verification without any intreaction with the human.

session_start();
include('rndkvp.class.php');
if( empty($_SESSION['humanCheck']) ){
    $humanCheck = new rndkvp(10);
}else{
    $humanCheck = unserialize($_SESSION['humanCheck']);
}

1. If the session has not been started elsewhere, start it before instantiating the class.
2. Include the class file.
3. If the class object has not already been saved to the session, instantiate as normal, otherwise load it from the session.

rndkvp takes 1 argument...

length = length of the generated key value pairs, defaults to 8

After all processing has been completed, the object must be saved to the session...

$_SESSION['humanCheck'] = serialize($humanCheck);

Refer to the test.php file for usage examples. Point your browser to this file to see how it works.

Methods

createFormInput() creates a hidden input form field containing the random key value pairs

validate( $value ) validates the submitted value

resetKVP( $length ) generates new random key value pairs


Changelog

0.1

Initial beta release

  Files folder image Files (3)  
File Role Description
Accessible without login Plain text file manual.txt Doc. Usage Documentation
Plain text file rndkvp.class.php Class Main Class
Accessible without login Plain text file test.php Example Test usage

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