proxy: Add an interface for user role assignment

This moves the lookup and the creation of the users' role assignemt out
of the user backend into its own interface. This makes the user backend
a bit simpler and allows to provide different implemenation for the user
role assignment more easily.

services/proxy/pkg/userroles/mocks/UserRoleAssigner.go

@@ -0,0 +1,77 @@
+// Code generated by mockery v2.14.0. DO NOT EDIT.
+
+package mocks
+
+import (
+	context "context"
+
+	mock "github.com/stretchr/testify/mock"
+
+	userv1beta1 "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
+)
+
+// UserRoleAssigner is an autogenerated mock type for the UserRoleAssigner type
+type UserRoleAssigner struct {
+	mock.Mock
+}
+
+// ApplyUserRole provides a mock function with given fields: ctx, user
+func (_m *UserRoleAssigner) ApplyUserRole(ctx context.Context, user *userv1beta1.User) (*userv1beta1.User, error) {
+	ret := _m.Called(ctx, user)
+
+	var r0 *userv1beta1.User
+	if rf, ok := ret.Get(0).(func(context.Context, *userv1beta1.User) *userv1beta1.User); ok {
+		r0 = rf(ctx, user)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*userv1beta1.User)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *userv1beta1.User) error); ok {
+		r1 = rf(ctx, user)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// UpdateUserRoleAssignment provides a mock function with given fields: ctx, user, claims
+func (_m *UserRoleAssigner) UpdateUserRoleAssignment(ctx context.Context, user *userv1beta1.User, claims map[string]interface{}) (*userv1beta1.User, error) {
+	ret := _m.Called(ctx, user, claims)
+
+	var r0 *userv1beta1.User
+	if rf, ok := ret.Get(0).(func(context.Context, *userv1beta1.User, map[string]interface{}) *userv1beta1.User); ok {
+		r0 = rf(ctx, user, claims)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*userv1beta1.User)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, *userv1beta1.User, map[string]interface{}) error); ok {
+		r1 = rf(ctx, user, claims)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+type mockConstructorTestingTNewUserRoleAssigner interface {
+	mock.TestingT
+	Cleanup(func())
+}
+
+// NewUserRoleAssigner creates a new instance of UserRoleAssigner. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+func NewUserRoleAssigner(t mockConstructorTestingTNewUserRoleAssigner) *UserRoleAssigner {
+	mock := &UserRoleAssigner{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}