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## com.google.appengine.api.users
Interface UserService

    public interface UserService

The UserService provides information useful for forcing a user to log in or out, and retrieving information about the user who is currently logged-in.

Method Summary
`java.lang.String` | `createLoginURL(java.lang.String destinationURL)` Returns an URL that can be used to display a login page to the user.
`java.lang.String` | `createLoginURL(java.lang.String destinationURL, java.lang.String authDomain)` Returns an URL that can be used to display a login page to the user.
`java.lang.String` | `createLogoutURL(java.lang.String destinationURL)` Returns an URL that can be used to log the current user out of this app.
`java.lang.String` | `createLogoutURL(java.lang.String destinationURL, java.lang.String authDomain)` Returns an URL that can be used to log the current user out of this app.
`User` | `getCurrentUser()` If the user is logged in, this method will return a `User` that contains information about them.
`boolean` | `isUserAdmin()` Returns true if the user making this request is an admin for this application, false otherwise.
`boolean` | `isUserLoggedIn()` Returns true if there is a user logged in, false otherwise.

Method Detail

### createLoginURL

    java.lang.String createLoginURL(java.lang.String destinationURL)

  Returns an URL that can be used to display a login page to the user.

  Parameters:
    `destinationURL` - where the user will be redirected after they log in.
  Returns:
    The URL that will present a login prompt.
  Throws:
    `java.lang.IllegalArgumentException` - If the destinationURL is not valid.

### createLoginURL

    java.lang.String createLoginURL(java.lang.String destinationURL,
                                    java.lang.String authDomain)

  Returns an URL that can be used to display a login page to the user. For trusted apps only. If the calling app does not have permission to use this feature, then this will behave just like createLoginURL(destinationURL).

  Parameters:
    `destinationURL` - where the user will be redirected after they log in.
    `authDomain` - authentication domain to use.
  Returns:
    The URL that will present a login prompt.
  Throws:
    `java.lang.IllegalArgumentException` - If the destinationURL is not valid.

### createLogoutURL

    java.lang.String createLogoutURL(java.lang.String destinationURL)

  Returns an URL that can be used to log the current user out of this app.

  Parameters:
    `destinationURL` - where the user will be redirected after they log out.
  Returns:
    The URL that will log the user out.
  Throws:
    `java.lang.IllegalArgumentException` - If the destinationURL is not valid.

### createLogoutURL

    java.lang.String createLogoutURL(java.lang.String destinationURL,
                                     java.lang.String authDomain)

  Returns an URL that can be used to log the current user out of this app. For trusted apps only. If the calling app does not have permission to use this feature, then this will behave just like createLogoutURL(destinationURL).

  Parameters:
    `destinationURL` - where the user will be redirected after they log out.
    `authDomain` - authentication domain to use.
  Returns:
    The URL that will log the user out.
  Throws:
    `java.lang.IllegalArgumentException` - If the destinationURL is not valid.

### isUserLoggedIn

    boolean isUserLoggedIn()

  Returns true if there is a user logged in, false otherwise.

### isUserAdmin

    boolean isUserAdmin()

  Returns true if the user making this request is an admin for this application, false otherwise.

  Throws:
    `java.lang.IllegalStateException` - If the current user is not logged in.

### getCurrentUser

    User getCurrentUser()

  If the user is logged in, this method will return a `User` that contains information about them. Note that repeated calls may not necessarily return the same `User` object.

  Returns:
    User if the user is logged in, null otherwise.

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