multi IDP 모델 적용 scaffolding

backend/internal/domain/idp_models.go

@@ -0,0 +1,28 @@
+package domain
+
+// BrokerUser is the standard user model used within Baron SSO business logic.
+// It defines the canonical set of fields that must be supported by any underlying IDP.
+type BrokerUser struct {
+	ID          string                 `json:"id" required:"true"`
+	Email       string                 `json:"email" required:"true"`
+	Name        string                 `json:"name"`
+	PhoneNumber string                 `json:"phone_number"`
+	// Attributes stores custom user attributes.
+	// The "required_keys" tag specifies which keys MUST be present in the IDP's schema support.
+	Attributes map[string]interface{} `json:"attributes" required_keys:"grade,department"`
+}
+
+// IDPMetadata represents the schema capabilities of an Identity Provider.
+type IDPMetadata struct {
+	// SupportedFields lists the BrokerUser fields (json tag names) that the IDP supports.
+	// For custom attributes, use the key name directly (e.g., "grade").
+	SupportedFields []string
+}
+
+// IdentityProvider is the interface that all IDP adapters must implement.
+type IdentityProvider interface {
+	Name() string
+	// GetMetadata returns the schema support information for this IDP.
+	// This is used for startup-time validation.
+	GetMetadata() (*IDPMetadata, error)
+}