1 files changed, 117 insertions, 0 deletions
diff --git a/uriloader/exthandler/nsIHandlerService.idl b/uriloader/exthandler/nsIHandlerService.idl
new file mode 100644
index 000000000..efea43937
--- /dev/null
+++ b/uriloader/exthandler/nsIHandlerService.idl
@@ -0,0 +1,117 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIHandlerInfo;
+interface nsISimpleEnumerator;
+
+[scriptable, uuid(53f0ad17-ec62-46a1-adbc-efccc06babcd)]
+interface nsIHandlerService : nsISupports
+{
+  /**
+   * Retrieve a list of all handlers in the datastore.  This list is not
+   * guaranteed to be in any particular order, and callers should not assume
+   * it will remain in the same order in the future.
+   *
+   * @returns a list of all handlers in the datastore
+   */
+  nsISimpleEnumerator enumerate();
+
+  /**
+   * Fill a handler info object with information from the datastore.
+   *
+   * Note: because of the way the external helper app service currently mixes
+   * OS and user handler info in the same handler info object, this method
+   * takes an existing handler info object (probably retrieved from the OS)
+   * and "fills it in" with information from the datastore, overriding any
+   * existing properties on the object with properties from the datastore.
+   *
+   * Ultimately, however, we're going to separate OS and user handler info
+   * into separate objects, at which point this method should be renamed to
+   * something like "get" or "retrieve", take a class and type (or perhaps
+   * a type whose class can be determined by querying the type, for example
+   * an nsIContentType which is also an nsIMIMEType or an nsIProtocolScheme),
+   * and return a handler info object representing only the user info.
+   *
+   * Note: if you specify an override type, then the service will fill in
+   * the handler info object with information about that type instead of
+   * the type specified by the object's nsIHandlerInfo::type attribute.
+   *
+   * This is useful when you are trying to retrieve information about a MIME
+   * type that doesn't exist in the datastore, but you have a file extension
+   * for that type, and nsIHandlerService::getTypeFromExtension returns another
+   * MIME type that does exist in the datastore and can handle that extension.
+   *
+   * For example, the user clicks on a link, and the content has a MIME type
+   * that isn't in the datastore, but the link has a file extension, and that
+   * extension is associated with another MIME type in the datastore (perhaps
+   * an unofficial MIME type preceded an official one, like with image/x-png
+   * and image/png).
+   *
+   * In that situation, you can call this method to fill in the handler info
+   * object with information about that other type by passing the other type
+   * as the aOverrideType parameter.
+   *
+   * @param aHandlerInfo   the handler info object
+   * @param aOverrideType  a type to use instead of aHandlerInfo::type
+   *
+   * Note: if there is no information in the datastore about this type,
+   * this method throws NS_ERROR_NOT_AVAILABLE. Callers are encouraged to
+   * check exists() before calling fillHandlerInfo(), to prevent spamming the
+   * console with XPCOM exception errors.
+   */
+  void fillHandlerInfo(in nsIHandlerInfo aHandlerInfo,
+                       in ACString aOverrideType);
+
+  /**
+   * Save the preferred action, preferred handler, possible handlers, and
+   * always ask properties of the given handler info object to the datastore.
+   * Updates an existing record or creates a new one if necessary.
+   *
+   * Note: if preferred action is undefined or invalid, then we assume
+   * the default value nsIHandlerInfo::useHelperApp.
+   *
+   * @param aHandlerInfo  the handler info object
+   */
+  void store(in nsIHandlerInfo aHandlerInfo);
+
+  /**
+   * Whether or not a record for the given handler info object exists
+   * in the datastore. If the datastore is corrupt (or some other error
+   * is caught in the implementation), false will be returned.
+   *
+   * @param aHandlerInfo  a handler info object
+   *
+   * @returns whether or not a record exists
+   */
+  boolean exists(in nsIHandlerInfo aHandlerInfo);
+
+  /**
+   * Remove the given handler info object from the datastore.  Deletes all
+   * records associated with the object, including the preferred handler, info,
+   * and type records plus the entry in the list of types, if they exist.
+   * Otherwise, it does nothing and does not return an error.
+   *
+   * @param aHandlerInfo  the handler info object
+   */
+  void remove(in nsIHandlerInfo aHandlerInfo);
+
+  /**
+   * Get the MIME type mapped to the given file extension in the datastore.
+   *
+   * XXX If we ever support extension -> protocol scheme mappings, then this
+   * method should work for those as well.
+   *
+   * Note: in general, you should use nsIMIMEService::getTypeFromExtension
+   * to get a MIME type from a file extension, as that method checks a variety
+   * of other sources besides just the datastore.  Use this only when you want
+   * to specifically get only the mapping available in the datastore.
+   *
+   * @param aFileExtension  the file extension
+   *
+   * @returns the MIME type, if any; otherwise returns an empty string ("").
+   */
+  ACString getTypeFromExtension(in ACString aFileExtension);
+};