Refactor claims so they can be totally omitted if only the parent is set.

authority/config.go

@@ -60,7 +60,6 @@ type AuthConfig struct {
 
 // Validate validates the authority configuration.
 func (c *AuthConfig) Validate(audiences []string) error {
-	var err error
 	if c == nil {
 		return errors.New("authority cannot be undefined")
 	}
@@ -68,13 +67,15 @@ func (c *AuthConfig) Validate(audiences []string) error {
 		return errors.New("authority.provisioners cannot be empty")
 	}
 
-	if c.Claims, err = c.Claims.Init(&globalProvisionerClaims); err != nil {
+	// Merge global and configuration claims
+	claimer, err := provisioner.NewClaimer(c.Claims, globalProvisionerClaims)
+	if err != nil {
 		return err
 	}
 
 	// Initialize provisioners
 	config := provisioner.Config{
-		Claims:    *c.Claims,
+		Claims:    claimer.Claims(),
 		Audiences: audiences,
 	}
 	for _, p := range c.Provisioners {

authority/provisioner/claims.go

@@ -8,76 +8,90 @@ import (
 
 // Claims so that individual provisioners can override global claims.
 type Claims struct {
-	globalClaims   *Claims
 	MinTLSDur      *Duration `json:"minTLSCertDuration,omitempty"`
 	MaxTLSDur      *Duration `json:"maxTLSCertDuration,omitempty"`
 	DefaultTLSDur  *Duration `json:"defaultTLSCertDuration,omitempty"`
 	DisableRenewal *bool     `json:"disableRenewal,omitempty"`
 }
 
-// Init initializes and validates the individual provisioner claims.
-func (pc *Claims) Init(global *Claims) (*Claims, error) {
-	if pc == nil {
-		pc = &Claims{}
+// Claimer is the type that controls claims. It provides an interface around the
+// current claim and the global one.
+type Claimer struct {
+	global Claims
+	claims *Claims
+}
+
+// NewClaimer initializes a new claimer with the given claims.
+func NewClaimer(claims *Claims, global Claims) (*Claimer, error) {
+	c := &Claimer{global: global, claims: claims}
+	return c, c.Validate()
+}
+
+// Claims returns the merge of the inner and global claims.
+func (c *Claimer) Claims() Claims {
+	disableRenewal := c.IsDisableRenewal()
+	return Claims{
+		MinTLSDur:      &Duration{c.MinTLSCertDuration()},
+		MaxTLSDur:      &Duration{c.MaxTLSCertDuration()},
+		DefaultTLSDur:  &Duration{c.DefaultTLSCertDuration()},
+		DisableRenewal: &disableRenewal,
 	}
-	pc.globalClaims = global
-	return pc, pc.Validate()
 }
 
 // DefaultTLSCertDuration returns the default TLS cert duration for the
 // provisioner. If the default is not set within the provisioner, then the global
 // default from the authority configuration will be used.
-func (pc *Claims) DefaultTLSCertDuration() time.Duration {
-	if pc.DefaultTLSDur == nil || pc.DefaultTLSDur.Duration == 0 {
-		return pc.globalClaims.DefaultTLSCertDuration()
+func (c *Claimer) DefaultTLSCertDuration() time.Duration {
+	if c.claims == nil || c.claims.DefaultTLSDur == nil {
+		return c.global.DefaultTLSDur.Duration
 	}
-	return pc.DefaultTLSDur.Duration
+	return c.claims.DefaultTLSDur.Duration
 }
 
 // MinTLSCertDuration returns the minimum TLS cert duration for the provisioner.
 // If the minimum is not set within the provisioner, then the global
 // minimum from the authority configuration will be used.
-func (pc *Claims) MinTLSCertDuration() time.Duration {
-	if pc.MinTLSDur == nil || pc.MinTLSDur.Duration == 0 {
-		return pc.globalClaims.MinTLSCertDuration()
+func (c *Claimer) MinTLSCertDuration() time.Duration {
+	if c.claims == nil || c.claims.MinTLSDur == nil {
+		return c.global.MinTLSDur.Duration
 	}
-	return pc.MinTLSDur.Duration
+	return c.claims.MinTLSDur.Duration
 }
 
 // MaxTLSCertDuration returns the maximum TLS cert duration for the provisioner.
 // If the maximum is not set within the provisioner, then the global
 // maximum from the authority configuration will be used.
-func (pc *Claims) MaxTLSCertDuration() time.Duration {
-	if pc.MaxTLSDur == nil || pc.MaxTLSDur.Duration == 0 {
-		return pc.globalClaims.MaxTLSCertDuration()
+func (c *Claimer) MaxTLSCertDuration() time.Duration {
+	if c.claims == nil || c.claims.MaxTLSDur == nil {
+		return c.global.MaxTLSDur.Duration
 	}
-	return pc.MaxTLSDur.Duration
+	return c.claims.MaxTLSDur.Duration
 }
 
 // IsDisableRenewal returns if the renewal flow is disabled for the
 // provisioner. If the property is not set within the provisioner, then the
 // global value from the authority configuration will be used.
-func (pc *Claims) IsDisableRenewal() bool {
-	if pc.DisableRenewal == nil {
-		return pc.globalClaims.IsDisableRenewal()
+func (c *Claimer) IsDisableRenewal() bool {
+	if c.claims == nil || c.claims.DisableRenewal == nil {
+		return *c.global.DisableRenewal
 	}
-	return *pc.DisableRenewal
+	return *c.claims.DisableRenewal
 }
 
 // Validate validates and modifies the Claims with default values.
-func (pc *Claims) Validate() error {
+func (c *Claimer) Validate() error {
 	var (
-		min = pc.MinTLSCertDuration()
-		max = pc.MaxTLSCertDuration()
-		def = pc.DefaultTLSCertDuration()
+		min = c.MinTLSCertDuration()
+		max = c.MaxTLSCertDuration()
+		def = c.DefaultTLSCertDuration()
 	)
 	switch {
-	case min == 0:
-		return errors.Errorf("claims: MinTLSCertDuration cannot be empty")
-	case max == 0:
-		return errors.Errorf("claims: MaxTLSCertDuration cannot be empty")
-	case def == 0:
-		return errors.Errorf("claims: DefaultTLSCertDuration cannot be empty")
+	case min <= 0:
+		return errors.Errorf("claims: MinTLSCertDuration must be greater than 0")
+	case max <= 0:
+		return errors.Errorf("claims: MaxTLSCertDuration must be greater than 0")
+	case def <= 0:
+		return errors.Errorf("claims: DefaultTLSCertDuration must be greater than 0")
 	case max < min:
 		return errors.Errorf("claims: MaxCertDuration cannot be less "+
 			"than MinCertDuration: MaxCertDuration - %v, MinCertDuration - %v", max, min)

authority/provisioner/jwk.go

@@ -23,6 +23,7 @@ type JWK struct {
 	Key          *jose.JSONWebKey `json:"key"`
 	EncryptedKey string           `json:"encryptedKey,omitempty"`
 	Claims       *Claims          `json:"claims,omitempty"`
+	claimer      *Claimer
 	audiences    []string
 }
 
@@ -57,7 +58,12 @@ func (p *JWK) Init(config Config) (err error) {
 	case p.Key == nil:
 		return errors.New("provisioner key cannot be empty")
 	}
-	p.Claims, err = p.Claims.Init(&config.Claims)
+
+	// Update claims with global ones
+	if p.claimer, err = NewClaimer(p.Claims, config.Claims); err != nil {
+		return err
+	}
+
 	p.audiences = config.Audiences
 	return err
 }
@@ -104,15 +110,15 @@ func (p *JWK) Authorize(token string) ([]SignOption, error) {
 		commonNameValidator(claims.Subject),
 		dnsNamesValidator(dnsNames),
 		ipAddressesValidator(ips),
-		profileDefaultDuration(p.Claims.DefaultTLSCertDuration()),
+		profileDefaultDuration(p.claimer.DefaultTLSCertDuration()),
 		newProvisionerExtensionOption(TypeJWK, p.Name, p.Key.KeyID),
-		newValidityValidator(p.Claims.MinTLSCertDuration(), p.Claims.MaxTLSCertDuration()),
+		newValidityValidator(p.claimer.MinTLSCertDuration(), p.claimer.MaxTLSCertDuration()),
 	}, nil
 }
 
 // AuthorizeRenewal returns an error if the renewal is disabled.
 func (p *JWK) AuthorizeRenewal(cert *x509.Certificate) error {
-	if p.Claims.IsDisableRenewal() {
+	if p.claimer.IsDisableRenewal() {
 		return errors.Errorf("renew is disabled for provisioner %s", p.GetID())
 	}
 	return nil

authority/provisioner/jwk_test.go

@@ -201,10 +201,9 @@ func TestJWK_AuthorizeRenewal(t *testing.T) {
 
 	// disable renewal
 	disable := true
-	p2.Claims = &Claims{
-		globalClaims:   &globalProvisionerClaims,
-		DisableRenewal: &disable,
-	}
+	p2.Claims = &Claims{DisableRenewal: &disable}
+	p2.claimer, err = NewClaimer(p2.Claims, globalProvisionerClaims)
+	assert.FatalError(t, err)
 
 	type args struct {
 		cert *x509.Certificate

authority/provisioner/oidc.go

@@ -55,6 +55,7 @@ type OIDC struct {
 	Claims                *Claims  `json:"claims,omitempty"`
 	configuration         openIDConfiguration
 	keyStore              *keyStore
+	claimer               *Claimer
 }
 
 // IsAdmin returns true if the given email is in the Admins whitelist, false
@@ -111,9 +112,10 @@ func (o *OIDC) Init(config Config) (err error) {
 	}
 
 	// Update claims with global ones
-	if o.Claims, err = o.Claims.Init(&config.Claims); err != nil {
+	if o.claimer, err = NewClaimer(o.Claims, config.Claims); err != nil {
 		return err
 	}
+
 	// Decode and validate openid-configuration endpoint
 	if err := getAndDecode(o.ConfigurationEndpoint, &o.configuration); err != nil {
 		return err
@@ -202,23 +204,23 @@ func (o *OIDC) Authorize(token string) ([]SignOption, error) {
 	// Admins should be able to authorize any SAN
 	if o.IsAdmin(claims.Email) {
 		return []SignOption{
-			profileDefaultDuration(o.Claims.DefaultTLSCertDuration()),
+			profileDefaultDuration(o.claimer.DefaultTLSCertDuration()),
 			newProvisionerExtensionOption(TypeOIDC, o.Name, o.ClientID),
-			newValidityValidator(o.Claims.MinTLSCertDuration(), o.Claims.MaxTLSCertDuration()),
+			newValidityValidator(o.claimer.MinTLSCertDuration(), o.claimer.MaxTLSCertDuration()),
 		}, nil
 	}
 
 	return []SignOption{
 		emailOnlyIdentity(claims.Email),
-		profileDefaultDuration(o.Claims.DefaultTLSCertDuration()),
+		profileDefaultDuration(o.claimer.DefaultTLSCertDuration()),
 		newProvisionerExtensionOption(TypeOIDC, o.Name, o.ClientID),
-		newValidityValidator(o.Claims.MinTLSCertDuration(), o.Claims.MaxTLSCertDuration()),
+		newValidityValidator(o.claimer.MinTLSCertDuration(), o.claimer.MaxTLSCertDuration()),
 	}, nil
 }
 
 // AuthorizeRenewal returns an error if the renewal is disabled.
 func (o *OIDC) AuthorizeRenewal(cert *x509.Certificate) error {
-	if o.Claims.IsDisableRenewal() {
+	if o.claimer.IsDisableRenewal() {
 		return errors.Errorf("renew is disabled for provisioner %s", o.GetID())
 	}
 	return nil

authority/provisioner/oidc_test.go

@@ -241,10 +241,9 @@ func TestOIDC_AuthorizeRenewal(t *testing.T) {
 
 	// disable renewal
 	disable := true
-	p2.Claims = &Claims{
-		globalClaims:   &globalProvisionerClaims,
-		DisableRenewal: &disable,
-	}
+	p2.Claims = &Claims{DisableRenewal: &disable}
+	p2.claimer, err = NewClaimer(p2.Claims, globalProvisionerClaims)
+	assert.FatalError(t, err)
 
 	type args struct {
 		cert *x509.Certificate

authority/provisioner/utils_test.go

@@ -109,6 +109,10 @@ func generateJWK() (*JWK, error) {
 	if err != nil {
 		return nil, err
 	}
+	claimer, err := NewClaimer(nil, globalProvisionerClaims)
+	if err != nil {
+		return nil, err
+	}
 	return &JWK{
 		Name:         name,
 		Type:         "JWK",
@@ -116,6 +120,7 @@ func generateJWK() (*JWK, error) {
 		EncryptedKey: encrypted,
 		Claims:       &globalProvisionerClaims,
 		audiences:    testAudiences,
+		claimer:      claimer,
 	}, nil
 }
 
@@ -136,6 +141,10 @@ func generateOIDC() (*OIDC, error) {
 	if err != nil {
 		return nil, err
 	}
+	claimer, err := NewClaimer(nil, globalProvisionerClaims)
+	if err != nil {
+		return nil, err
+	}
 	return &OIDC{
 		Name:                  name,
 		Type:                  "OIDC",
@@ -150,6 +159,7 @@ func generateOIDC() (*OIDC, error) {
 			keySet: jose.JSONWebKeySet{Keys: []jose.JSONWebKey{*jwk}},
 			expiry: time.Now().Add(24 * time.Hour),
 		},
+		claimer: claimer,
 	}, nil
 }