add SAML Auth hook (#2730)

New hooks:
    samlGotAuthnResponse
    samlGenerateAuthnRequest

lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Auth/SAML.pm

@@ -185,6 +185,12 @@ sub extractFormInfo {
                 return PE_SAML_SSO_ERROR;
             }
 
+            # Call samlGotAuthnResponse
+            my $h =
+              $self->p->processHook( $req, 'samlGotAuthnResponse', $idp,
+                $login );
+            return PE_SAML_SSO_ERROR if ( $h != PE_OK );
+
             # Check Destination
             return PE_SAML_DESTINATION_ERROR
               unless ( $self->checkDestination( $saml_response, $url ) );

lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Lib/SAML.pm

@@ -1024,6 +1024,11 @@ sub createAuthnRequest {
         }
     }
 
+    # Call samlGenerateAuthnRequest hook
+    my $h =
+      $self->p->processHook( $req, 'samlGenerateAuthnRequest', $idp, $login );
+    return if ( $h != PE_OK );
+
     # Build authentication request
     unless ( $self->buildAuthnRequestMsg($login) ) {
         $self->logger->error("Could not build authentication request on $idp");