Add detailed descriptions for configuring Dropbox and Google Drive

admin_manual/configuration/custom_mount_config_gui.rst

@@ -47,10 +47,25 @@ to be entered:
 -  **root**: the name of the folder inside the ftp server to mount (optional,
    defaults to ‘/’)
 
-If *Dropbox* or *Google Drive* are chosen as storage backend an OAuth dialog will
-be shown to automatically generate and fetch the required token information.
-
 .. _Amazon S3: http://aws.amazon.com/de/s3/
 .. _Dropbox: https://www.dropbox.com/
 .. _Google Drive: https://drive.google.com/start
 .. _OpenStack Swift: http://openstack.org/projects/storage/
+
+Dropbox
+~~~~~~
+Mounting a Dropbox account requires that you create an app with Dropbox and then provide the app key and secret to the external storage configuration user interface. Go to My apps at Dropbox and create an app. Select *Full Dropbox* access level. Copy the app key and app secret and paste them into the corresponding fields for the Dropbox storage.
+
+Click the *Grant access* button and you will be redirected to a Dropbox website to give ownCloud permission to access your account.
+
+
+Google Drive
+~~~~~~~~~~~
+Mounting a Google Drive account requires that you create an API project in the Google APIs Console. Select `Services` and enable both `Drive API` and `Drive SDK`. Next select `API Access` and click `Create an OAuth 2.0 client ID`. Fill out the Branding Information as you see fit and click Next. In Client Id Settings select `Web application` for the  Application type. Next to `Your site or hostname` click  more options) and add the following to the Authorized Redirect URIs:
+
+- http://yourowncloud/index.php/settings/personal
+- http://yourowncloud/index.php/settings/admin
+
+Copy the client id and client secret and paste them into the corresponding fields for the Google Drive Storage.
+
+Click the *Grant access* button and you will be redirected to a Google website to give ownCloud permission to access your account.