Prompt the user for an email address that they would like to use to authenticate to the site. The email address will be passed to the supplied callback in the form of an identity assertion, which is a signed object that asserts that a specific email address is owned by a user who is willing to share it with a specific site, at a specific time. See identity assertions for more information.
callback
- is a required callback that will be invoked with an assertion in the case of success, and withundefined
on error (for example, if the user cancels or closes the dialog)options
- is an optional object who's properties change the behavior of the opened dialog. Allowed properties include:requiredEmail
- When provided contains an email that the user must use. This is useful when a site wishes to provide privileges only to a specific user.
silent
- (boolean) - When true, an identity will be fetched without prompting the user. Suc