- Bugfix: just before submitting a node, one could change the content of

that node to something that would not have passed the preview pages.

  Patch by Revar:

    "If you uploaded a valid file, and filled out the form right, you will
    get a Submit button.  The problem comes in when you choose a different
    file to upload, and then click Submit.  The filestore_save() function
    cannot do proper validation and handling of the form data, as it only
    returns a list of what node fields to save.  On error, a node entry is
    still created, but with only the nid field set.  The user can't be
    forced to fix their bad entry."

    "Add a _form_validate() node hook to process and validate any form
    results.  That way even on Submit, the node code would check the
    validity of the data, and if bad, it could drop you back to the preview
    screen with the current bad data warnings.  Have it return an array of
    errors that can be passed in as $error to the _form() hook.  If it
    returns a null array, then there's no errors, and the submit can go
    through."

modules/node.module

@@ -755,11 +755,20 @@ function node_validate($node, &$error) {
 
   }
 
+  /*
+  ** Do node type specific validation checks.
+  */
+
+  $function = $node->type ."_validate";
+  if (function_exists($function)) {
+    $node = $function($node, $error);
+  }
+
   return $node;
 }
 
 
-function node_form($edit) {
+function node_form($edit, $error = NULL) {
 
   /*
   ** Save the referer.  We record where the user came from such that we
@@ -772,7 +781,10 @@ function node_form($edit) {
   ** Validate the node:
   */
 
+  if (!$error) {
+  /* Only validate if we don't already know the errors. */
   $edit = node_validate($edit, $error);
+  }
 
   /*
   ** Generate a teaser when necessary:
@@ -932,7 +944,7 @@ function node_edit($id) {
   return $output;
 }
 
-function node_preview($node) {
+function node_preview($node, $error = NULL) {
 
   if (!user_access("post content")) {
     return message_access();
@@ -991,7 +1003,7 @@ function node_preview($node) {
 
   node_view($view);
 
-  return node_form($node);
+  return node_form($node, $error);
 }
 
 function node_submit($node) {
@@ -1002,6 +1014,7 @@ function node_submit($node) {
   }
 
   $context->tid = $tid;
+
   if (user_access("post content", $context)) {
 
     /*
@@ -1010,6 +1023,14 @@ function node_submit($node) {
 
     $node = node_validate($node, $error);
 
+    /*
+    ** If something went wrong, go back to the preview form:
+    */
+
+    if ($error) {
+      return node_preview($node, $error);
+    }
+
     /*
     ** Create a new revision when required:
     */

modules/node/node.module

@@ -755,11 +755,20 @@ function node_validate($node, &$error) {
 
   }
 
+  /*
+  ** Do node type specific validation checks.
+  */
+
+  $function = $node->type ."_validate";
+  if (function_exists($function)) {
+    $node = $function($node, $error);
+  }
+
   return $node;
 }
 
 
-function node_form($edit) {
+function node_form($edit, $error = NULL) {
 
   /*
   ** Save the referer.  We record where the user came from such that we
@@ -772,7 +781,10 @@ function node_form($edit) {
   ** Validate the node:
   */
 
+  if (!$error) {
+  /* Only validate if we don't already know the errors. */
   $edit = node_validate($edit, $error);
+  }
 
   /*
   ** Generate a teaser when necessary:
@@ -932,7 +944,7 @@ function node_edit($id) {
   return $output;
 }
 
-function node_preview($node) {
+function node_preview($node, $error = NULL) {
 
   if (!user_access("post content")) {
     return message_access();
@@ -991,7 +1003,7 @@ function node_preview($node) {
 
   node_view($view);
 
-  return node_form($node);
+  return node_form($node, $error);
 }
 
 function node_submit($node) {
@@ -1002,6 +1014,7 @@ function node_submit($node) {
   }
 
   $context->tid = $tid;
+
   if (user_access("post content", $context)) {
 
     /*
@@ -1010,6 +1023,14 @@ function node_submit($node) {
 
     $node = node_validate($node, $error);
 
+    /*
+    ** If something went wrong, go back to the preview form:
+    */
+
+    if ($error) {
+      return node_preview($node, $error);
+    }
+
     /*
     ** Create a new revision when required:
     */