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/**
 * This file contains an interface to the Permission Manager,
 * used to persistenly store permissions for different object types (cookies, 
 * images etc) on a site-by-site basis.
 *
 * This service broadcasts the following notification when the permission list
 * is changed:
 *
 * topic  : "perm-changed" (PERM_CHANGE_NOTIFICATION)
 *          broadcast whenever the permission list changes in some way. there
 *          are four possible data strings for this notification; one
 *          notification will be broadcast for each change, and will involve
 *          a single permission.
 * subject: an nsIPermission interface pointer representing the permission object
 *          that changed.
 * data   : "deleted"
 *          a permission was deleted. the subject is the deleted permission.
 *          "added"
 *          a permission was added. the subject is the added permission.
 *          "changed"
 *          a permission was changed. the subject is the new permission.
 *          "cleared"
 *          the entire permission list was cleared. the subject is null.
 */

#include "nsISupports.idl"
#include "nsISimpleEnumerator.idl"

interface nsIURI;
interface nsIObserver;

[scriptable, uuid(4F6B5E00-0C36-11d5-A535-0010A401EB10)]
interface nsIPermissionManager : nsISupports
{
  /**
   * Predefined return values for the testPermission method and for
   * the permission param of the add method
   */
  const PRUint32 UNKNOWN_ACTION = 0;
  const PRUint32 ALLOW_ACTION = 1;
  const PRUint32 DENY_ACTION = 2;

  /**
   * Add permission information for a given URI and permission type. This
   * operation will cause the type string to be registered if it does not
   * currently exist.
   *
   * @param uri         the uri to add the permission for
   * @param type        a case-sensitive ASCII string, identifying the consumer.
   *                    Consumers should choose this string to be unique, with
   *                    respect to other consumers. The number of unique type
   *                    indentifiers may be limited.
   * @param permission  an integer from 1 to 15, representing the desired
   *                    action (e.g. allow or deny). The interpretation of
   *                    this number is up to the consumer, and may represent
   *                    different actions for different types. Consumers may
   *                    use one of the enumerated permission actions defined
   *                    above. 0 is reserved for UNKNOWN_ACTION, and shouldn't
   *                    be used.
   * @throws            NS_ERROR_FAILURE if there is no more room for adding
   *                    a new type
   */
  void add(in nsIURI uri,
           in string type,
           in PRUint32 permission);

  /**
   * Remove permission information for a given URI and permission type.
   * Note that this method takes a host string, not an nsIURI.
   *
   * @param host   the host to remove the permission for
   * @param type   a case-sensitive ASCII string, identifying the consumer. 
   *               The type must have been previously registered using the
   *               add() method.
   */
  void remove(in AUTF8String host,
              in string type);

  /**
   * Clear permission information for all websites.
   */
  void removeAll();

  /**
   * Test whether a website has permission to perform the given action.
   * @param uri     the uri to be tested
   * @param type    a case-sensitive ASCII string, identifying the consumer
   * @param return  see add(), param permission. returns UNKNOWN_ACTION when
   *                there is no stored permission for this uri and / or type.
   */
  PRUint32 testPermission(in nsIURI uri,
                          in string type);

  /**
   * Allows enumeration of all stored permissions
   * @return an nsISimpleEnumerator interface that allows access to
   *         nsIPermission objects
   */
  readonly attribute nsISimpleEnumerator enumerator;
};

%{ C++
#define NS_PERMISSIONMANAGER_CONTRACTID "@mozilla.org/permissionmanager;1"

#define PERM_CHANGE_NOTIFICATION "perm-changed"
%}
