Allow login using email

[devinivy]

This allow users to create a session using their email address (in addition to their handle). I marked session.create's handle input as deprecated and added an optional identifier input— the PDS should be free to establish any identifier it wants with its users in addition to their handle.

[pfrazee]

Okay I'm +1 to this solution. Your approach to the lexicon approach is right for published schemas but I think because this isn't published yet, what we can do instead is:

• Just switch the lexicon to identifier and drop handle entirely
• In the PDS code, still check for handle. Open an issue to drop that in a month(?) and comment with the issue number

[devinivy]

@pfrazee one minor detail to confirm— I believe we will need to leave identifier optional for the time being. Then when we stop checking for handle in a month, it should become required. So technically you will be able to send a valid payload that looks like { password }, and it will just behave like you gave a bad identifier/password combo.

[pfrazee]

@devinivy Ah yes, you're quite right.

[devinivy]

Alright, that should be patched-up! Created #493 to track the deprecation of handle.

[pfrazee]

LGTM!

[dholms]

cool cool 👌