2.1

• Moved zetacomponents/database to "suggest" in composer.json. If you rely on this feature you now need to include " zetacomponents/database" into "require" key in your own composer.json. (Issue #51)
• New method in Refresh grant called rotateRefreshTokens(). Pass in true to issue a new refresh token each time an access token is refreshed. This parameter needs to be set to true in order to request reduced scopes with the new access token. (Issue #47)
• Rename key column in oauth_scopes table to scope as key is a reserved SQL word. (Issue #45)
• The scope parameter is no longer required by default as per the RFC. (Issue #43)
• You can now set multiple default scopes by passing an array into setDefaultScope(). (Issue #42)
• The password and client credentials grants now allow for multiple sessions per user. (Issue #32)
• Scopes associated to authorization codes are not held in their own table (Issue #44)
• Database schema updates.

2.0.5

• Fixed oauth_session_token_scopes table primary key
• Removed DEFAULT '' that has slipped into some tables
• Fixed docblock for SessionInterface::associateRefreshToken()

2.0.4

• Renamed primary key in oauth_client_endpoints table
• Adding missing column to oauth_session_authcodes
• SECURITY FIX: A refresh token should be bound to a client ID

2.0.3

• Fixed a link to code in composer.json

2.0.2

• Updated README with wiki guides
• Removed null as default parameters in some methods in the storage interfaces
• Fixed license copyright

2.0

If you're upgrading from v1.0.8 there are lots of breaking changes

• Rewrote the session storage interface from scratch so methods are more obvious
• Included a PDO driver which implements the storage interfaces so the library is more "get up and go"
• Further normalised the database structure so all sessions no longer contain infomation related to authorization grant (which may or may not be enabled)
• A session can have multiple associated access tokens
• Induvidual grants can have custom expire times for access tokens
• Authorization codes now have a TTL of 10 minutes by default (can be manually set)
• Refresh tokens now have a TTL of one week by default (can be manually set)
• The client credentials grant will no longer gives out refresh tokens as per the specification