Week 4: Files & Directories Assignment
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reg
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<?php
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/**
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* @package Server-Side Scripting - PHP
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*
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* @created 20th November 2021
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* @author Llewellyn van der Merwe <https://git.vdm.dev/Llewellyn>
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* @git WEBD-310-45 <https://git.vdm.dev/Llewellyn/WEBD-310-45>
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* @license GNU General Public License version 2 or later; see LICENSE.txt
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*
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* @week4
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* Create a document with a form that registers bowlers for a bowling
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* tournament. Use a single text fi le that saves information for each
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* bowler on a separate line. Include the bowler’s name, age, and aver-
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* age, separated by commas. Ensure that the Projects directory has read
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* and write permissions for everyone.
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*
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*/
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// our little global values
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$message = '';
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$error = array();
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$valid = true;
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$registered = true;
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// form keys
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$form = array('name' => 'string', 'age' => 'int', 'average' => 'int');
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// form values
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$entry = array();
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// function to validate user input (basic)
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// for more advance checkout https://github.com/joomla-framework/filter/blob/2.0-dev/src/InputFilter.php
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function validatePostUserInput($key, $type = 'int')
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{
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// bring our global values
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global $message;
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global $entry;
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global $form;
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// we have a local per/field validation switch
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$valid = false;
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// we clear the message each time
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$message = '';
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// first we check if the key exist
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if (!isset($_POST[$key]))
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{
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$valid = false;
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}
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// check if the string that its Register :)
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elseif ($type === 'form')
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{
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$valid = $_POST[$key] === 'Register';
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}
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// check if the string (only name)
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elseif ($type === 'string')
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{
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$value = preg_replace("/[^A-Za-z\. ]/", '', $_POST[$key]);
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$valid = true;
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// check name
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if ($value !== $_POST[$key])
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{
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$message = "<br /><small>Please only use alphabetical characters for the <b>$key</b> field!</small>";
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$valid = false;
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}
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elseif (strlen(trim($value)) == 0)
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{
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$message = "<br /><small>The <b>$key</b> field is required and can not be empty!</small>";
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$valid = false;
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}
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// remove all white space
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$value = trim($value);
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}
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// check that this is an int
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elseif ($type === 'int' && is_numeric($_POST[$key]) && is_int($_POST[$key] + 0))
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{
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$value = (int) $_POST[$key];
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$valid = true;
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// check the age to be realistic
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if ($key === 'age' && ($value > 120 || $value < 10))
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{
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if ($value > 120)
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{
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$message = "<br /><small>Only below 120 years can register to this tournament.</small>";
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}
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else
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{
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$message = "<br /><small>Only 10 years and above can register to this tournament.</small>";
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}
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$valid = false;
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}
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// check the bowling average to be reasonable
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// https://www.quora.com/What-is-a-good-bowling-average-for-an-amateur-Bowling-on-a-lane-not-bowling-in-cricket
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// Lets set the range wide to allow beginners and professionals
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if ($key === 'average' && ($value > 300 || $value < 60))
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{
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$message = "<br /><small>Please enter a reasonable average!</small>";
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$valid = false;
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}
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}
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else
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{
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$message = "<br /><small>Only integer values allowed as <b>$key</b>!</small>";
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$valid = false;
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}
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// we set the value if valid
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if ($valid && isset($form[$key]))
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{
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$entry[$key] = $_POST[$key];
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}
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return $valid;
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}
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// get a valid value
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function getValue($key, $default = '')
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{
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global $entry;
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global $registered;
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// check if the value was set
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if ($registered && isset($entry[$key]))
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{
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return $entry[$key];
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}
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return $default;
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}
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// to retain valid values
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function setFormValue($key)
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{
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global $entry;
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global $registered;
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// check if the value was set
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if ($registered && isset($entry[$key]))
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{
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return " value=\"$entry[$key]\"";
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}
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return '';
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}
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// to display an error message
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function getError($key)
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{
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global $error;
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global $registered;
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// check if the value was set
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if ($registered && isset($error[$key]))
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{
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return "<br /><span id=\"$key-error-serverside\" style=\"color: red;\">$error[$key]</span>";
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}
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return '';
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}
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// function to save the entry to a file
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function saveToFile()
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{
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// for errors
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global $error;
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// get the entries
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global $entry;
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// the path to our project registration directory
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$path = getcwd() . '/reg';
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// check if the path exist
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if (!file_exists($path))
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{
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// We create the path so everyone has access to this project registration directory
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if (!mkdir($path, 0777))
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{
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$error[] = 'We could not create the project folder, check your folder permissions.';
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return false;
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}
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}
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// the file where we store the registrations
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$file_path = $path . "/bowlers.txt";
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// check the file does not exist
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if (!file_exists($file_path))
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{
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// creat and place the values as the first line
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if (file_put_contents($file_path, implode(",", $entry) . "\n"))
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{
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return true;
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}
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$error[] = 'We could not create/write to the registration file, check your file permissions.';
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return false;
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}
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// or just append the values
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elseif (file_put_contents($file_path, implode(",", $entry) . "\n", FILE_APPEND))
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{
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return true;
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}
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$error[] = 'We could not write to the registration file, check your file permissions.';
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return false;
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}
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// we get the data from the post if there is any
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if (!validatePostUserInput('Submit', 'form'))
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{
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// registration was not yet made, or a serious issue. So we try again.
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$registered = false;
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}
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else
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{
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foreach ($form as $field => $validate)
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{
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if (!validatePostUserInput($field, $validate))
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{
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// show an error as we do not have a hours
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$error[$field] = "Invalid value detected!$message";
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$valid = false;
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}
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}
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}
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?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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<title>Registers Bowlers</title>
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<meta http-equiv="content-type"
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content="text/html; charset=utf-8"/>
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</head>
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<body>
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<?php if ($registered && $valid) : ?>
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<?php if (saveToFile()): ?>
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<h2 style="text-align:center; color: green"><?php echo getValue('name', 'The Bowler'); ?> was Registered Successfully to the
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Bowling Tournament.</h2>
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<hr/>
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<div style="text-align:center; color: green">With these details:
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<?php array_walk($entry, function (&$value, $key) {
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$value = "<i>" . ucfirst($key) . ":</i> <b>$value</b>";
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}); ?>
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<ul style="list-style-type: none;">
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<li><?php echo implode('</li><li>', $entry) ?></li>
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</ul>
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</div>
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<hr/>
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<p style="text-align:center"><a type="button" href="Register.php">
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<button type="button">Click here to register another bowler</button>
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</a></p>
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<?php else: ?>
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<h2 style="text-align:center; color: red">There was an server error</h2>
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<?php if (count($error) > 0) : ?>
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<div style="text-align:center; color: red;">
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<ul style="list-style-type: none;">
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<li><?php echo implode('</li><li>', $error) ?></li>
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</ul>
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</div>
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<?php endif; ?>
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<p style="text-align:center; color: red">The registration could not be captured, please try again later. Should this
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issue continue
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then inform the Bowling Tournament organizers.</p>
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<p style="text-align:center"><a type="button" href="Register.php">
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<button type="button">Click here to try again.</button>
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</a></p>
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<?php endif; ?>
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<?php else: ?>
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<h2 style="text-align:center">Register for Bowling Tournament</h2>
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<?php if (count($error) > 0) : ?>
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<h3 style="color: red">Submission failed, please try again</h3>
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<?php endif; ?>
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<form id="registration" name="registration" action="Register.php" method="post" onSubmit="return checkForm();">
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<div>Name of Bowler:
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<input type="text" name="name"<?php echo setFormValue('name'); ?>/>
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<?php echo getError('name'); ?>
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</div>
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<br/>
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<div>Age of Bowler:
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<input type="text" name="age"<?php echo setFormValue('age'); ?>/>
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<span id="age-error" style="color: red; visibility:hidden;">only integer values allowed</span>
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<?php echo getError('age'); ?>
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</div>
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<br/>
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<div>Bowling Average:
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<input type="text" name="average"<?php echo setFormValue('average'); ?>/>
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<span id="average-error" style="color: red; visibility:hidden;">only integer values allowed</span>
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<?php echo getError('average'); ?>
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</div>
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<br/>
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<div>
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<input type="reset" value="Clear Form" onclick="resetForm();"/>
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<input type="submit" name="Submit" value="Register"/></div>
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</form>
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<script type="text/javascript">
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// reset or hide errors
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function resetForm() {
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document.getElementById('age-error').style.visibility = "hidden";
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document.getElementById('average-error').style.visibility = "hidden";
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// if server side error are set hide them as well
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let name_error = document.getElementById("name-error-serverside");
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if (name_error) {
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name_error.style.visibility = "hidden";
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}
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let age_error = document.getElementById("age-error-serverside");
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if (age_error) {
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age_error.style.visibility = "hidden";
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}
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let average_error = document.getElementById("average-error-serverside");
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if (average_error) {
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average_error.style.visibility = "hidden";
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}
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}
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// validate data (basic)
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function checkForm() {
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// convert the form to an object
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let formData = new FormData(document.getElementById("registration"));
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// post the form
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let allowed = true;
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// we just validate int here
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if (!isInt(formData.get("age"))) {
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document.getElementById('age-error').style.visibility = "visible";
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// show the wrong value in console
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console.log(formData.get("age"));
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// stop the posting
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allowed = false;
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}
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if (!isInt(formData.get("average"))) {
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document.getElementById('average-error').style.visibility = "visible";
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// show the wrong value in console
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console.log(formData.get("average"));
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// stop the posting
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allowed = false;
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}
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// stop the posting if not valid
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return allowed;
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// to test server side validation
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// return true;
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}
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// Thanks to https://stackoverflow.com/a/14794066/1429677
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function isInt(value) {
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return !isNaN(value) && (function (x) {
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return (x | 0) === x;
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})(parseFloat(value))
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}
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</script>
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<?php endif; ?>
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</body>
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</html>
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