oauth2

type AccessTokenStorage interface {
	CreateAccessTokenSession(ctx context.Context, signature string, request fosite.Requester) (err error)

	GetAccessTokenSession(ctx context.Context, signature string, session fosite.Session) (request fosite.Requester, err error)

	DeleteAccessTokenSession(ctx context.Context, signature string) (err error)
}

type AccessTokenStrategy interface {
	AccessTokenSignature(token string) string
	GenerateAccessToken(ctx context.Context, requester fosite.Requester) (token string, signature string, err error)
	ValidateAccessToken(ctx context.Context, requester fosite.Requester, token string) (err error)
}

type AuthorizeCodeStorage interface {
	// GetAuthorizeCodeSession stores the authorization request for a given authorization code.
	CreateAuthorizeCodeSession(ctx context.Context, code string, request fosite.Requester) (err error)

	// GetAuthorizeCodeSession hydrates the session based on the given code and returns the authorization request.
	// If the authorization code has been invalidated with `InvalidateAuthorizeCodeSession`, this
	// method should return the ErrInvalidatedAuthorizeCode error.
	//
	// Make sure to also return the fosite.Requester value when returning the fosite.ErrInvalidatedAuthorizeCode error!
	GetAuthorizeCodeSession(ctx context.Context, code string, session fosite.Session) (request fosite.Requester, err error)

	// InvalidateAuthorizeCodeSession is called when an authorize code is being used. The state of the authorization
	// code should be set to invalid and consecutive requests to GetAuthorizeCodeSession should return the
	// ErrInvalidatedAuthorizeCode error.
	InvalidateAuthorizeCodeSession(ctx context.Context, code string) (err error)
}

type AuthorizeCodeStrategy interface {
	AuthorizeCodeSignature(token string) string
	GenerateAuthorizeCode(ctx context.Context, requester fosite.Requester) (token string, signature string, err error)
	ValidateAuthorizeCode(ctx context.Context, requester fosite.Requester, token string) (err error)
}

type AuthorizeExplicitGrantHandler struct {
	AccessTokenStrategy   AccessTokenStrategy
	RefreshTokenStrategy  RefreshTokenStrategy
	AuthorizeCodeStrategy AuthorizeCodeStrategy
	CoreStorage           CoreStorage

	// AuthCodeLifespan defines the lifetime of an authorize code.
	AuthCodeLifespan time.Duration

	// AccessTokenLifespan defines the lifetime of an access token.
	AccessTokenLifespan time.Duration

	ScopeStrategy fosite.ScopeStrategy

	// SanitationWhiteList is a whitelist of form values that are required by the token endpoint. These values
	// are safe for storage in a database (cleartext).
	SanitationWhiteList []string

	TokenRevocationStorage TokenRevocationStorage
}

type AuthorizeImplicitGrantTypeHandler struct {
	AccessTokenStrategy AccessTokenStrategy

	// AccessTokenStorage is used to persist session data across requests.
	AccessTokenStorage AccessTokenStorage

	// AccessTokenLifespan defines the lifetime of an access token.
	AccessTokenLifespan time.Duration

	ScopeStrategy fosite.ScopeStrategy
}

type ClientCredentialsGrantHandler struct {
	*HandleHelper
	ScopeStrategy fosite.ScopeStrategy
}

type ClientCredentialsGrantStorage interface {
	AccessTokenStorage
}

type CoreStorage interface {
	AuthorizeCodeStorage
	AccessTokenStorage
	RefreshTokenStorage
}

type CoreStrategy interface {
	AccessTokenStrategy
	RefreshTokenStrategy
	AuthorizeCodeStrategy
}

type CoreValidator struct {
	CoreStrategy
	CoreStorage
	ScopeStrategy                 fosite.ScopeStrategy
	DisableRefreshTokenValidation bool
}

type DefaultJWTStrategy struct {
	jwt.JWTStrategy
	HMACSHAStrategy *HMACSHAStrategy
	Issuer          string
}

type HMACSHAStrategy struct {
	Enigma                *enigma.HMACStrategy
	AccessTokenLifespan   time.Duration
	AuthorizeCodeLifespan time.Duration
}

type HandleHelper struct {
	AccessTokenStrategy AccessTokenStrategy
	AccessTokenStorage  AccessTokenStorage
	AccessTokenLifespan time.Duration
}

type JWTAccessTokenStrategy interface {
	AccessTokenStrategy
	JWTStrategy
}

type JWTSession struct {
	JWTClaims *jwt.JWTClaims
	JWTHeader *jwt.Headers
	ExpiresAt map[fosite.TokenType]time.Time
	Username  string
	Subject   string
}

type JWTSessionContainer interface {
	// GetJWTClaims returns the claims.
	GetJWTClaims() *jwt.JWTClaims

	// GetJWTHeader returns the header.
	GetJWTHeader() *jwt.Headers

	fosite.Session
}

type JWTStrategy interface {
	ValidateJWT(ctx context.Context, tokenType fosite.TokenType, token string) (requester fosite.Requester, err error)
}

type RefreshTokenGrantHandler struct {
	AccessTokenStrategy    AccessTokenStrategy
	RefreshTokenStrategy   RefreshTokenStrategy
	TokenRevocationStorage TokenRevocationStorage

	// AccessTokenLifespan defines the lifetime of an access token.
	AccessTokenLifespan time.Duration
}

type RefreshTokenStorage interface {
	CreateRefreshTokenSession(ctx context.Context, signature string, request fosite.Requester) (err error)

	GetRefreshTokenSession(ctx context.Context, signature string, session fosite.Session) (request fosite.Requester, err error)

	DeleteRefreshTokenSession(ctx context.Context, signature string) (err error)
}

type RefreshTokenStrategy interface {
	RefreshTokenSignature(token string) string
	GenerateRefreshToken(ctx context.Context, requester fosite.Requester) (token string, signature string, err error)
	ValidateRefreshToken(ctx context.Context, requester fosite.Requester, token string) (err error)
}

type ResourceOwnerPasswordCredentialsGrantHandler struct {
	// ResourceOwnerPasswordCredentialsGrantStorage is used to persist session data across requests.
	ResourceOwnerPasswordCredentialsGrantStorage ResourceOwnerPasswordCredentialsGrantStorage

	RefreshTokenStrategy RefreshTokenStrategy
	ScopeStrategy        fosite.ScopeStrategy

	*HandleHelper
}

type ResourceOwnerPasswordCredentialsGrantStorage interface {
	Authenticate(ctx context.Context, name string, secret string) error
	AccessTokenStorage
	RefreshTokenStorage
}

type StatelessJWTValidator struct {
	JWTAccessTokenStrategy
	ScopeStrategy fosite.ScopeStrategy
}

type TokenRevocationHandler struct {
	TokenRevocationStorage TokenRevocationStorage
	RefreshTokenStrategy   RefreshTokenStrategy
	AccessTokenStrategy    AccessTokenStrategy
}

type TokenRevocationStorage interface {
	RefreshTokenStorage
	AccessTokenStorage

	// RevokeRefreshToken revokes a refresh token as specified in:
	// https://tools.ietf.org/html/rfc7009#section-2.1
	// If the particular
	// token is a refresh token and the authorization server supports the
	// revocation of access tokens, then the authorization server SHOULD
	// also invalidate all access tokens based on the same authorization
	// grant (see Implementation Note).
	RevokeRefreshToken(ctx context.Context, requestID string) error

	// RevokeAccessToken revokes an access token as specified in:
	// https://tools.ietf.org/html/rfc7009#section-2.1
	// If the token passed to the request
	// is an access token, the server MAY revoke the respective refresh
	// token as well.
	RevokeAccessToken(ctx context.Context, requestID string) error
}