auth

type Auther interface {
	// Authenticate checks username and password and returns a user if correct. The method
	// returns in constant-ish time, regardless of whether the user exists or the password is
	// correct or incorrect.
	Authenticate(username, password string) (*User, error)

	// Authorize returns nil if the given user has access to the given topic using the desired
	// permission. The user param may be nil to signal an anonymous user.
	Authorize(user *User, topic string, perm Permission) error
}

type Grant struct {
	TopicPattern string // May include wildcard (*)
	AllowRead    bool
	AllowWrite   bool
}

type Manager interface {
	// AddUser adds a user with the given username, password and role. The password should be hashed
	// before it is stored in a persistence layer.
	AddUser(username, password string, role Role) error

	// RemoveUser deletes the user with the given username. The function returns nil on success, even
	// if the user did not exist in the first place.
	RemoveUser(username string) error

	// Users returns a list of users. It always also returns the Everyone user ("*").
	Users() ([]*User, error)

	// User returns the user with the given username if it exists, or ErrNotFound otherwise.
	// You may also pass Everyone to retrieve the anonymous user and its Grant list.
	User(username string) (*User, error)

	// ChangePassword changes a user's password
	ChangePassword(username, password string) error

	// ChangeRole changes a user's role. When a role is changed from RoleUser to RoleAdmin,
	// all existing access control entries (Grant) are removed, since they are no longer needed.
	ChangeRole(username string, role Role) error

	// AllowAccess adds or updates an entry in th access control list for a specific user. It controls
	// read/write access to a topic. The parameter topicPattern may include wildcards (*).
	AllowAccess(username string, topicPattern string, read bool, write bool) error

	// ResetAccess removes an access control list entry for a specific username/topic, or (if topic is
	// empty) for an entire user. The parameter topicPattern may include wildcards (*).
	ResetAccess(username string, topicPattern string) error

	// DefaultAccess returns the default read/write access if no access control entry matches
	DefaultAccess() (read bool, write bool)
}

type Permission int

type Role string

type SQLiteAuth struct {
	// contains filtered or unexported fields
}

type User struct {
	Name   string
	Hash   string // password hash (bcrypt)
	Role   Role
	Grants []Grant
}