Seo HTTP Error manager

/* ************** A LIRE *********************************
Remarques, Traduction, Suggestion, Bug : http://www.wordpress-seo.com/seo-http-error-manager.php
Modifiez en un clic le code d'erreur Http de votre page ( 301,302,404 )
Aidez nous a faire connaître ce Plugin en ajoutant un lien vers wordpress-seo.com
( optionnel mais apprécié , merci )
*********************************************************** */

class SeoHttpErrorManager
{
// ---------------------------------------------
// Constantes
// ---------------------------------------------
var $DefaultTagActivation = "code_errorcode_worpress_seo"; // ne pas editer
var $DefaultTagDestination = "url_errorcode_worpress_seo"; // ne pas editer
var $DefaultURL = "http://www.wordpress-seo.com/redirection-par-defaut.php"; // editable a vos risques et peril
var $DoNothing = 0; // aucune action
var $Do302 = 1; // 302
var $Do301 = 2; // 301
var $Do404 = 3; // 404

//--------------------------------------------------------//
// Redirection
//--------------------------------------------------------//
function TestRedirection()
{
global $wp_query;

if(isset($wp_query))
{
if(is_single())
{
if(isset($wp_query->post->ID))
{
$A=$this->LoadCustomKey($wp_query->post->ID);
// $DestinationUrl =$A['url'];
// $DoError =$A['code'];
// On redirige
switch(intval($A['code']))
{
case $this->Do404:
header("HTTP/1.1 404 Not Found");
die("<b>404 File not found!</b>");
exit();
break;
case $this->Do302:
header("HTTP/1.1 302 Found", false, 302);
header("Location: ".strval($A['url'])."");
exit();
break;
case $this->Do301:
header('HTTP/1.1 301 Moved Permanently', false, 301);
header('Location: '.strval($A['url']).'');
exit();
break;
case $this->DoNothing: default: break;
} // switch
} // on a bien un id
} // is single
} // qp_query ok
// pas de traitement possible ....
// return !
}
// ------------------------------------------------------------------
//
// ------------------------------------------------------------------
function Print_formulaire()
{
global $wp_query,$wpdb,$post;
if(isset($post))
{
if(isset($post->ID))
{
$A=$this->LoadCustomKey($post->ID);
?>
<br><hr><br>
<fieldset id="wpseoerrcode">
<legend>Plugin Seo, Wordpress-seo.com : Imposer un code d'erreur.<br>Nous vous remercions de ne pas cree d'erreur 302 vers http://www.wordpress-seo.com</legend>
<div>
Action :
<select name="wordpressseoerrorcode_err" id="wordpressseoerrorcode_err">
<option value="0"<? if($A['code']==$this->DoNothing){echo " selected";}?>>Ne rien faire</option>
<option value="1"<? if($A['code']==$this->Do301){echo " selected";}?>>301 ( redirection permanante )</option>
<option value="2"<? if($A['code']==$this->Do302){echo " selected";}?>>302 ( redirection temporaire )</option>
<option value="3"<? if($A['code']==$this->Do404){echo " selected";}?>>404 ( n'existe plus )</option>
</select>
<br>
URL (301 ou 302 ): <input type="text" name="wordpressseoerrorcode_url" value="<? echo strval($A['url']); ?>" size="50">
</div>
</fieldset>
<?
}// un ID ?
}// wpquery
}
// ---------------------------------------------
//
// ---------------------------------------------
function LoadCustomKey($PostId=0)
{
$Returned=array();

$Returned['url']=$this->DefaultURL;
$Returned['code']=$this->DoNothing;
if($PostId==0) {return $Returned;}
// --------------------------------------------------------------------
$mykey_err = get_post_custom_values($this->DefaultTagActivation,$PostId);
if(isset($mykey_err))
{
foreach ( $mykey_err as $key => $value )
{
// echo $key . " => " . $value . "<br />";
$Returned['code']=$value;
}
// Optimisation
if( $Returned['code']==$this->Do404 ||
$Returned['code']==$this->Do302 ||
$Returned['code']==$this->Do301 )
{
// On gere une erreur connue
$mykey_url = get_post_custom_values($this->DefaultTagDestination,$PostId);
foreach ( $mykey_url as $key => $value )
{
// echo $key . " => " . $value . "<br />";
$Returned['url']=$value;
}
} // error connu
}// si error
return $Returned;
}
// ---------------------------------------
function Save($PostId,$Error,$Url)
{
$this->Clear($PostId);
if(strlen($Url)==0) { $Url=$this->DefaultURL;}
add_post_meta($PostId, $this->DefaultTagDestination, $Url);

if( $Error==$this->Do404 || $Error==$this->Do302 || $Error==$this->Do301 ) {} // OK
else {$Error=$this->DoNothing;}
add_post_meta($PostId, $this->DefaultTagActivation, $Error);
}
// ---------------------------------------
function Clear($PostId)
{
delete_post_meta($PostId, $this->DefaultTagActivation);
delete_post_meta($PostId, $this->DefaultTagDestination);
}
// ---------------------------------------
function SaveFormulaire()
{
if(isset($_POST['wordpressseoerrorcode_err']))
{
$this->Save($_POST['ID'],$_POST['wordpressseoerrorcode_err'],$_POST['wordpressseoerrorcode_url']) ;
}
}
// ---------------------------------------

} // classe

// -----------------------------------------------------------
// appel au fonction Hors de wordpress possible !
// -----------------------------------------------------------
function SHEM_redirect() {global $SHEM;$SHEM->TestRedirection();}
function SHEM_print() {global $SHEM;$SHEM->Print_formulaire();}
function SHEM_saveform() {global $SHEM;$SHEM->SaveFormulaire();}
// ----------------------------------------------------------
function SHEM_add301($PostId,$Url) {global $SHEM;$SHEM->Save($PostId,$SHEM->Do301,$Url);}
function SHEM_add302($PostId,$Url) {global $SHEM;$SHEM->Save($PostId,$SHEM->Do302,$Url);}
function SHEM_add404($PostId) {global $SHEM;$SHEM->Save($PostId,$SHEM->Do404);}
function SHEM_clear($PostId) {global $SHEM;$SHEM->Clear($PostId);}

// ------------------------------------------------------------
// Action pour l'edition/sauvegarde
// ------------------------------------------------------------
// edition
add_action('edit_form_advanced', 'SHEM_print');
add_action('simple_edit_form', 'SHEM_print');
add_action('edit_page_form', 'SHEM_print');
add_action('publish_post', 'SHEM_saveform');
// affichage
add_action('template_redirect', 'SHEM_redirect');