Index: workflow.install
===================================================================
--- workflow.install	(revision 2480)
+++ workflow.install	(working copy)
@@ -17,6 +17,7 @@
   foreach (node_get_types() as $type => $name) {
     variable_del('workflow_'. $type);
   }
+  variable_del('workflow_user0_is_author');
   drupal_uninstall_schema('workflow');
 }
 
Index: workflow_access.module
===================================================================
--- workflow_access.module	(revision 2480)
+++ workflow_access.module	(working copy)
@@ -13,10 +13,9 @@
  * roles as access lists, so rids translate directly to gids.
  */
 function workflow_access_node_grants($account, $op) {
-  return array(
-    'workflow_access'       => array_keys($account->roles),
-    'workflow_access_owner' => array($account->uid),
-  );
+    $access['workflow_access'] = array_keys($account->roles);
+    if ($account->uid || variable_get('workflow_user0_is_author',0)) $access['workflow_access_owner'] =array($account->uid);
+  return $access; 
 }
 
 /**
@@ -30,15 +29,29 @@
 
   // We have state information about this node, so get permissions for this state.
   if (is_numeric($sid)) {
+    $authors = workflow_get_authors($node);
     $result = db_query('SELECT * FROM {workflow_access} WHERE sid = %d', $sid);
     while ($grant = db_fetch_object($result)) {
-      $grants[] = array(
-        'realm'        => ($grant->rid == -1) ? 'workflow_access_owner' : 'workflow_access',
-        'gid'          => ($grant->rid == -1) ? $node->uid : $grant->rid,
-        'grant_view'   => $grant->grant_view,
-        'grant_update' => $grant->grant_update,
-        'grant_delete' => $grant->grant_delete
-      ); 
+      if ($grant->rid == -1 ) {
+        foreach($authors as $uid) { 
+           $grants[] = array(
+            'realm'        => 'workflow_access_owner' ,
+            'gid'          => $uid,
+            'grant_view'   => $grant->grant_view,
+            'grant_update' => $grant->grant_update,
+            'grant_delete' => $grant->grant_delete
+          );
+        }
+      } else {
+        $grants[] = array(
+            'realm'        =>'workflow_access',
+            'gid'          =>  $grant->rid,
+            'grant_view'   => $grant->grant_view,
+            'grant_update' => $grant->grant_update,
+            'grant_delete' => $grant->grant_delete
+          );
+      }
+ 
     }
   }
 
Index: workflow.admin.inc
===================================================================
--- workflow.admin.inc	(revision 2480)
+++ workflow.admin.inc	(working copy)
@@ -656,6 +656,12 @@
       '#default_value' => variable_get('workflow_' . $type, array('node')),
     );
   }
+  $form['workflow_user0_is_author'] = array(
+    '#title'=> 'Treat Anonymous as valid author',
+    '#default_value'=>variable_get('workflow_user0_is_author',0),
+    '#description' => 'This will treat all anonymous users as author when node author is anonymous.', 
+    '#type'=>'checkbox',
+  );
   $form['submit'] = array(
     '#type' => 'submit',
     '#value' => t('Save workflow mapping')
@@ -677,6 +683,7 @@
   $output = drupal_render($form['help']);
   $output .= theme('table', $header, $rows);
   return $output . drupal_render($form);
+  
 }
 
 /**
@@ -686,6 +693,8 @@
  */
 function workflow_types_form_submit($form, &$form_state) {
   workflow_types_save($form_state['values']);
+  
+  variable_set('workflow_user0_is_author', $form_state['values']['workflow_user0_is_author']);
   drupal_set_message(t('The workflow mapping was saved.'));
   menu_rebuild(); 
   $form_state['redirect'] = 'admin/build/workflow';
Index: workflow.module
===================================================================
--- workflow.module	(revision 2480)
+++ workflow.module	(working copy)
@@ -107,6 +107,19 @@
   return $items;
 }
 
+function workflow_get_authors($node){
+   $authors = array($node->uid => $node->uid);
+   drupal_alter('workflow_authors',$authors,$node)  ;
+   if(is_array($authors)) return $authors; 
+   else return array();
+}
+
+function workflow_workflow_authors_alter(&$authors,$node) {
+    if (!variable_get('workflow_user0_is_author',0)) {
+        $key = array_search(0,$authors);
+        if ($key !== false) unset($authors[$key]);
+    }
+}
 /**
  * Menu access control callback. Determine access to Workflow tab.
  */
@@ -118,9 +131,11 @@
     return FALSE;
   }
   $roles = array_keys($user->roles);
-  if ($node->uid == $user->uid) {
+    $authors = workflow_get_authors($node);
+  if (in_array($user->uid,$authors)) {
     $roles = array_merge(array('author'), $roles);
   }
+  
   $workflow = db_fetch_object(db_query("SELECT * FROM {workflows} WHERE wid = %d", $wid));
   $allowed_roles = $workflow->tab_roles ? explode(',', $workflow->tab_roles) : array();
 
@@ -683,7 +698,8 @@
   $current_sid = workflow_node_current_state($node);
 
   // If user is node author or this is a new page, give the authorship role.
-  if (($user->uid == $node->uid && $node->uid > 0) || (arg(0) == 'node' && arg(1) == 'add')) {
+    $authors = workflow_get_authors($node);
+  if ((in_array($user->uid,$authors)) || (arg(0) == 'node' && arg(1) == 'add')) {
     $roles += array('author' => 'author');
   }
   if ($user->uid == 1) {