/source/Plug-in/xajax/examples/thewall/thewall.server.php
PHP | 236 lines | 119 code | 24 blank | 93 comment | 13 complexity | 5bff4f139f47acebd4540902e3f0c9e8 MD5 | raw file
1<?php 2/* 3 File: thewall.server.php 4 5 Example which demonstrates a xajax implementation of a graffiti wall. 6 7 Title: Graffiti Wall Example 8 9 Please see <copyright.inc.php> for a detailed description, copyright 10 and license information. 11*/ 12 13/* 14 Section: Files 15 16 - <thewall.php> 17 - <thewall.common.php> 18 - <thewall.server.php> 19*/ 20 21/* 22 @package xajax 23 @version $Id: thewall.server.php 362 2007-05-29 15:32:24Z calltoconstruct $ 24 @copyright Copyright (c) 2005-2006 by Jared White & J. Max Wilson 25 @license http://www.xajaxproject.org/bsd_license.txt BSD License 26*/ 27 28/* 29 Section: Define constants 30 31 Integer: MAX_SCRIBBLES 32 33 The number of scribbles that will be retained. The default is 5. 34*/ 35if (!defined ('MAX_SCRIBBLES')) 36{ 37 define ('MAX_SCRIBBLES', 5); 38} 39 40/* 41 String: DATA_FILE 42 43 The file that will be used to store the messages on the server. 44*/ 45if (!defined ('DATA_FILE')) 46{ 47 define ('DATA_FILE', "thewall.dta"); 48} 49 50/* 51 Class: graffiti 52*/ 53class graffiti 54{ 55 /* 56 String: html 57 58 Stores the html that is being generated for the current request. 59 */ 60 var $html; 61 62 /* 63 Boolean: isValid 64 65 Indicates that the html generated for this request is valid and 66 can be added to the wall <DATA_FILE>. 67 */ 68 var $isValid = false; 69 70 /* 71 Constructor: graffiti 72 73 Builds the <html> output and sets the <isValid> indicator. 74 */ 75 function graffiti($sHandle, $sWords) 76 { 77 if (trim($sHandle) == "" || trim($sWords) == "") 78 { 79 return; 80 } 81 $this->html = "\n<div style=\"font-weight: bold;text-align:".$this->getRandomAlignment(); 82 $this->html .= ";color:".$this->getRandomColor().";\">"; 83 $this->html .= "<span style=\"font-size:".$this->getRandomFontSize()."%;\">"; 84 $this->html .= strip_tags(stripslashes($sWords)); 85 $this->html .= "</span><br/><span style=\"font-size: small;\">"; 86 $this->html .= " ~ ".strip_tags(stripslashes($sHandle))." ".date("m/d/Y H:i:s")."</span></div>"; 87 88 $this->isValid = true; 89 } 90 91 /* 92 Function: getRandomFontSize 93 94 Generate a font size based off a random number. 95 */ 96 function getRandomFontSize() 97 { 98 srand((double)microtime()*1000003); 99 return rand(100,300); 100 } 101 102 /* 103 Function: getRandomColor 104 105 Generate a browser safe color based on a random number. 106 */ 107 function getRandomColor() 108 { 109 $sColor = "rgb("; 110 srand((double)microtime()*1000003); 111 $sColor .= rand(0,255).","; 112 srand((double)microtime()*1000003); 113 $sColor .= rand(0,255).","; 114 $sColor .= rand(0,255).")"; 115 116 return $sColor; 117 } 118 119 /* 120 Function: getRandomAlignment 121 122 Generates a text-alignment value based on a random number. 123 */ 124 function getRandomAlignment() 125 { 126 $sAlign = ""; 127 srand((double)microtime()*1000003); 128 $textAlign = rand(0,2); 129 switch($textAlign) 130 { 131 case 0: $sAlign = "left"; break; 132 case 1: $sAlign = "right"; break; 133 case 2: $sAlign = "center"; break; 134 135 } 136 return $sAlign; 137 } 138 139 /* 140 Function: save 141 142 Writes the current <graffiti->html> to the <DATA_FILE> when <graffiti->isValid> 143 or returns an error message. 144 */ 145 function save() 146 { 147 if ($this->isValid) 148 { 149 $rFile = @fopen(DATA_FILE,"a+"); 150 if (!$rFile) { 151 return "ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder."; 152 } 153 fwrite($rFile, $this->html); 154 fclose($rFile); 155 return null; 156 } 157 else 158 { 159 return "Please supply both a handle and some graffiti to scribble on the wall."; 160 } 161 } 162} 163 164/* 165 Section: xajax request handlers 166 167 Function: scribble 168 169 Processes the users form input and passes the values to an instance 170 of the <graffiti> class. 171 172 If the graffiti class generates and error, it is returned to the browser 173 using <xajax->alert>, otherwise, <xajax->script> is used to instruct the 174 browser to make a request to <updateWall> and <xajax->clear> is used to 175 clear the form input. 176*/ 177function scribble($aFormValues) 178{ 179 $sHandle = $aFormValues['handle']; 180 $sWords = $aFormValues['words']; 181 $objResponse = new xajaxResponse(); 182 183 $objGraffiti = new graffiti($sHandle,$sWords); 184 $sErrMsg = $objGraffiti->save(); 185 if (!$sErrMsg) 186 { 187 $objResponse->script("xajax_updateWall();"); 188 $objResponse->clear("words","value"); 189 } 190 else 191 $objResponse->alert($sErrMsg); 192 193 return $objResponse; 194} 195 196/* 197 Function: updateWall 198 199 Processes the data previously written to the <DATA_FILE> by <graffiti->save>. 200*/ 201function updateWall() 202{ 203 $objResponse = new xajaxResponse(); 204 205 if (file_exists(DATA_FILE)) { 206 $aFile = @file(DATA_FILE); 207 if (!$aFile) { 208 $objResponse->addAlert("ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder."); 209 return $objResponse; 210 } 211 212 $sHtmlSave = implode("\n",array_slice($aFile, -MAX_SCRIBBLES)); 213 $sHtmlSave=str_replace("\n\n","\n",$sHtmlSave); 214 } 215 else { 216 $sHtmlSave = ""; 217 $aFile = array(); 218 } 219 $rFile = @fopen(DATA_FILE,"w+"); 220 if (!$rFile) { 221 $objResponse->alert("ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder."); 222 return $objResponse; 223 } 224 fwrite($rFile, $sHtmlSave); 225 fclose($rFile); 226 227 $sHtml = implode("\n",array_reverse(array_slice($aFile, -MAX_SCRIBBLES))); 228 229 $objResponse->assign("theWall","innerHTML",$sHtml); 230 231 return $objResponse; 232} 233 234require("thewall.common.php"); 235$xajax->processRequest(); 236?>