graph:Add stubs for education/classes endpoints (#5360)

* Renamed files for consistency reasons

err_school.go implements the full education interface not just schools.
ldap_school.go renamed to ldap_education_school.go for making it
consistent with ldap_education_user.go

* graph: Add stubs for education/classes endpoints

The acutal backend implementations are still empty.

services/graph/pkg/identity/backend.go

@@ -60,6 +60,17 @@ type EducationBackend interface {
 	// RemoveUserFromEducationSchool removes a single member (by ID) from a school
 	RemoveUserFromEducationSchool(ctx context.Context, schoolID string, memberID string) error
 
+	// GetEducationClasses lists all classes
+	GetEducationClasses(ctx context.Context, queryParam url.Values) ([]*libregraph.EducationClass, error)
+	// GetEducationClasses reads a given class by id
+	GetEducationClass(ctx context.Context, namedOrID string, queryParam url.Values) (*libregraph.EducationClass, error)
+	// CreateEducationClass creates the supplied education class in the identity backend.
+	CreateEducationClass(ctx context.Context, class libregraph.EducationClass) (*libregraph.EducationClass, error)
+	// DeleteEducationClass deletes the supplied education class in the identity backend.
+	DeleteEducationClass(ctx context.Context, nameOrID string) error
+	// GetEducationClassMembers returns the EducationUser members for an EducationClass
+	GetEducationClassMembers(ctx context.Context, nameOrID string) ([]*libregraph.EducationUser, error)
+
 	// CreateEducationUser creates a given education user in the identity backend.
 	CreateEducationUser(ctx context.Context, user libregraph.EducationUser) (*libregraph.EducationUser, error)
 	// DeleteEducationUser deletes a given educationuser, identified by username or id, from the backend

services/graph/pkg/identity/err_school.go → services/graph/pkg/identity/err_education.go

@@ -50,6 +50,31 @@ func (i *ErrEducationBackend) RemoveUserFromEducationSchool(ctx context.Context,
 	return errNotImplemented
 }
 
+// GetEducationClasses implements the EducationBackend interface
+func (i *ErrEducationBackend) GetEducationClasses(ctx context.Context, queryParam url.Values) ([]*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// GetEducationClass implements the EducationBackend interface
+func (i *ErrEducationBackend) GetEducationClass(ctx context.Context, namedOrID string, queryParam url.Values) (*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// CreateEducationClass implements the EducationBackend interface
+func (i *ErrEducationBackend) CreateEducationClass(ctx context.Context, class libregraph.EducationClass) (*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// DeleteEducationClass implements the EducationBackend interface
+func (i *ErrEducationBackend) DeleteEducationClass(ctx context.Context, nameOrID string) error {
+	return errNotImplemented
+}
+
+// GetEducationClassMembers implements the EducationBackend interface
+func (i *ErrEducationBackend) GetEducationClassMembers(ctx context.Context, nameOrID string) ([]*libregraph.EducationUser, error) {
+	return nil, errNotImplemented
+}
+
 // CreateEducationUser creates a given education user in the identity backend.
 func (i *ErrEducationBackend) CreateEducationUser(ctx context.Context, user libregraph.EducationUser) (*libregraph.EducationUser, error) {
 	return nil, errNotImplemented

services/graph/pkg/identity/ldap_education_class.go

@@ -0,0 +1,33 @@
+package identity
+
+import (
+	"context"
+	"net/url"
+
+	libregraph "github.com/owncloud/libre-graph-api-go"
+)
+
+// GetEducationClasses implements the EducationBackend interface for the LDAP backend.
+func (i *LDAP) GetEducationClasses(ctx context.Context, queryParam url.Values) ([]*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// CreateEducationClass implements the EducationBackend interface for the LDAP backend.
+func (i *LDAP) CreateEducationClass(ctx context.Context, class libregraph.EducationClass) (*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// GetEducationClass implements the EducationBackend interface for the LDAP backend.
+func (i *LDAP) GetEducationClass(ctx context.Context, namedOrID string, queryParam url.Values) (*libregraph.EducationClass, error) {
+	return nil, errNotImplemented
+}
+
+// DeleteEducationClass implements the EducationBackend interface for the LDAP backend.
+func (i *LDAP) DeleteEducationClass(ctx context.Context, nameOrID string) error {
+	return errNotImplemented
+}
+
+// GetEducationClassMembers implements the EducationBackend interface for the LDAP backend.
+func (i *LDAP) GetEducationClassMembers(ctx context.Context, nameOrID string) ([]*libregraph.EducationUser, error) {
+	return nil, errNotImplemented
+}