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The $validators parameter contains an array of function names that will be called if the file is successfully uploaded. For example, the user_validate_picture() function, which is a form validation function that is called after a user edits his or her My account page, adds three validators before calling file_save_upload(). If a parameter is to be passed to the validation function, it is defined in an array. For example, in the following code, when the validators are run, the call to file_validate_image_resolution() will look something like file_ validate_image_resolution('85x85'): /** * Validates uploaded picture on user account page. */ function user_validate_picture(&$form, &$form_state) { $validators = array( 'file_validate_is_image' => array(), 'file_validate_image_resolution' => array(variable_get('user_picture_dimensions', '85x85')), 'file_validate_size' => array(variable_get('user_picture_file_size', '30') * 1024), ); if ($file = file_save_upload('picture_upload', $validators)) { ... } ... } The $dest parameter in the file_save_upload() function is optional and may contain the directory to which the file will be copied. For example, when processing files attached to a node, the upload module uses file_directory_path() (which defaults to sites/default/ files) as the value for $dest (see Figure 13-6). If $dest is not provided, the temporary directory will be used. The $replace parameter defines what Drupal should do if a file with the same name already exists. Possible values are listed in Table 13-3.

In this example, the chat widget is contained in an iframe, so it does not have direct access to the parent window. When the chat widget receives a chat message, it can use postMessage to send a message to the main page so that the page can alert the user of the chat widget that a new message has been received. Similarly, the page can send messages about the user s status to the chat widget. Both the page and the widget can listen for messages from each other by adding the respective origins to a white list of allowed origins. Before the introduction of postMessage, communicating between iframes could sometimes be accomplished by direct scripting. A script running in one page would attempt to manipulate another document. This might not be allowed due to security restrictions. Instead of direct programmatic access, postMessage provides asynchronous message passing between JavaScript contexts. As shown in Figure 5-2, without postMessage, cross origin communication would result in security errors, enforced by browsers to prevent cross-site scripting attacks.

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Figure 13-6. The file object as it exists when passed to file_save_upload() validators The return value for file_save_upload() is a fully populated file object (as shown in Figure 13-7), or 0 if something went wrong.

<!-- ===================================================================== --> <!-- the ServiceLocator where we specify the remote services --> <services:Services id="services"/> <!-- the FrontController, containing Commands-to-Event mappings --> <control:MainController id="mainController" /> <!-- ===================================================================== --> <mx:Fade id="fadeInApp" alphaFrom="0" alphaTo="1" duration="500" /> <mx:VBox width="100%" height="100%" backgroundAlpha=".88" verticalScrollPolicy="off" horizontalScrollPolicy="off" verticalAlign="top" horizontalAlign="center"> <mx:ViewStack id="vsAppLevel" width="100%" height="100%" paddingTop="0" creationPolicy="all"> <mx:Canvas id="loginView" showEffect="Fade" hideEffect="Fade"> <Main:Login width="100%" height="100%" /> </mx:Canvas> <mx:VBox width="100%" height="100%" id="applicationView" backgroundAlpha="0" verticalScrollPolicy="off" horizontalScrollPolicy="off" paddingTop="0" verticalAlign="top" horizontalAlign="center" showEffect="Fade" hideEffect="Fade"> <mx:VBox width="985" height="735" paddingTop="0" verticalGap="0" verticalScrollPolicy="off" horizontalScrollPolicy="off" borderStyle="solid" borderThickness="2" backgroundColor="#FFFFFF" backgroundAlpha=".75"> <Main:Header backgroundColor="red" /> <mx:VBox width="100%" height="100%"> <Main:MainView /> </mx:VBox> <Main:Footer backgroundColor="blue"/> </mx:VBox> </mx:VBox> </mx:ViewStack> </mx:VBox> </mx:Application>

Figure 13-7 The file object as it exists when returned from a successful call to file_save_upload() After calling file_save_upload(), a new file exists in Drupal s temporary directory and a new record is written to the files table The record contains the same values as the file object shown in Figure 13-7 Notice that the status field is set to 0 That means that as far as Drupal is concerned, this is still a temporary file It is the caller s responsibility to make the file permanent Continuing with our example of uploading a user picture, we see that the user module takes the approach of copying this file to the directory defined in Drupal s user_picture_path variable and renaming it using the user s ID: // The image was saved using file_save_upload() and was added to the // files table as a temporary file.

We'll make a copy and let the garbage // collector delete the original upload $info = image_get_info($file->filepath); $destination = variable_get('user_picture_path', 'pictures') '/picture-' $form['#uid'] '' $info['extension']; file_copy($file, $destination, FILE_EXISTS_REPLACE)); .. This moves the uploaded image to sites/default/files/pictures/picture-2jpg The garbage collector that is referred to in the preceding code comment is responsible for cleaning up temporary files that are languishing in the temporary directory Drupal knows about them because it has a record for each file in the files table with the status field set to 0 The garbage collector can be found in the system_cron() function in modules/system/ systemmodule It deletes temporary files that are older than the number of seconds specified by the constant DRUPAL_MAXIMUM_TEMP_FILE_AGE The value of the constant is 1440 seconds, or 24 minutes.

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