Implement methods for user secrets management

This commit introduces internal/juju/userSecret and adds method to add user secrets.

Implement internal Juju secrets add, update, and remove functionality

This commit introduces several changes to the Juju client in the `internal/juju/client.go` file.
It includes the implementation of methods for adding, updating, and removing secrets. Additionally,

Furthermore, the commit includes changes to the `secret.go` file, introducing new types for managinng secrets.
It also includes changes to the `interfaces.go` file, defining new interfaces for the Juju client API.

Add secretURI to UpdateSecret

Add secretURI to DeleteSecret

Add AutoPrunt to UpdateSecret schema

Add SecretId to ReadSecret func instead of name.

Add lost Asserts.

Add secretNotFoundError

Extract mocks creation into separate suite.

Introduce typedError(err) usage in ClientAPI funcs.

Add renaming to UpdateSecret

Use struct raather than pointer for Output structures.

Introcue NewName in Update input struct.

Use pointers in all places in structs where the parameter is not
neccessary.

Add base64 encoding co Create and change Read fucntion to get value with
decode.

Add base64 encoding for values in Update

internal/juju/client.go

@@ -44,6 +44,7 @@ type Client struct {
 	Offers       offersClient
 	SSHKeys      sshKeysClient
 	Users        usersClient
+	Secrets      secretsClient
 }
 
 type jujuModel struct {
@@ -87,6 +88,7 @@ func NewClient(ctx context.Context, config ControllerConfiguration) (*Client, er
 		Offers:       *newOffersClient(sc),
 		SSHKeys:      *newSSHKeysClient(sc),
 		Users:        *newUsersClient(sc),
+		Secrets:      *newSecretsClient(sc),
 	}, nil
 }
 

internal/juju/common_test.go

@@ -0,0 +1,41 @@
+// Copyright 2024 Canonical Ltd.
+// Licensed under the Apache License, Version 2.0, see LICENCE file for details.
+
+package juju
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"go.uber.org/mock/gomock"
+)
+
+type JujuSuite struct {
+	suite.Suite
+
+	testModelName string
+
+	mockConnection   *MockConnection
+	mockSharedClient *MockSharedClient
+}
+
+func (s *JujuSuite) setupMocks(t *testing.T) *gomock.Controller {
+	s.testModelName = "test-secret-model"
+
+	ctlr := gomock.NewController(t)
+
+	s.mockConnection = NewMockConnection(ctlr)
+	s.mockConnection.EXPECT().Close().Return(nil).AnyTimes()
+
+	log := func(msg string, additionalFields ...map[string]interface{}) {
+		s.T().Logf("logging from shared client %q, %+v", msg, additionalFields)
+	}
+	s.mockSharedClient = NewMockSharedClient(ctlr)
+	s.mockSharedClient.EXPECT().Debugf(gomock.Any(), gomock.Any()).Do(log).AnyTimes()
+	s.mockSharedClient.EXPECT().Errorf(gomock.Any(), gomock.Any()).Do(log).AnyTimes()
+	s.mockSharedClient.EXPECT().Tracef(gomock.Any(), gomock.Any()).Do(log).AnyTimes()
+	s.mockSharedClient.EXPECT().JujuLogger().Return(&jujuLoggerShim{}).AnyTimes()
+	s.mockSharedClient.EXPECT().GetConnection(&s.testModelName).Return(s.mockConnection, nil).AnyTimes()
+
+	return ctlr
+}

internal/juju/interfaces.go

@@ -9,10 +9,12 @@ import (
 	apiapplication "github.com/juju/juju/api/client/application"
 	apiclient "github.com/juju/juju/api/client/client"
 	apiresources "github.com/juju/juju/api/client/resources"
+	apisecrets "github.com/juju/juju/api/client/secrets"
 	apicommoncharm "github.com/juju/juju/api/common/charm"
 	"github.com/juju/juju/core/constraints"
 	"github.com/juju/juju/core/model"
 	"github.com/juju/juju/core/resources"
+	"github.com/juju/juju/core/secrets"
 	"github.com/juju/juju/rpc/params"
 	"github.com/juju/names/v4"
 )
@@ -62,3 +64,13 @@ type ResourceAPIClient interface {
 	AddPendingResources(args apiresources.AddPendingResourcesArgs) ([]string, error)
 	ListResources(applications []string) ([]resources.ApplicationResources, error)
 }
+
+type SecretAPIClient interface {
+	CreateSecret(name, description string, data map[string]string) (string, error)
+	ListSecrets(reveal bool, filter secrets.Filter) ([]apisecrets.SecretDetails, error)
+	UpdateSecret(
+		uri *secrets.URI, name string, autoPrune *bool,
+		newName string, description string, data map[string]string,
+	) error
+	RemoveSecret(uri *secrets.URI, name string, revision *int) error
+}

internal/juju/package_test.go

@@ -3,5 +3,5 @@
 
 package juju_test
 
-//go:generate go run go.uber.org/mock/mockgen -package juju -destination mock_test.go github.com/juju/terraform-provider-juju/internal/juju SharedClient,ClientAPIClient,ApplicationAPIClient,ModelConfigAPIClient,ResourceAPIClient
+//go:generate go run go.uber.org/mock/mockgen -package juju -destination mock_test.go github.com/juju/terraform-provider-juju/internal/juju SharedClient,ClientAPIClient,ApplicationAPIClient,ModelConfigAPIClient,ResourceAPIClient,SecretAPIClient
 //go:generate go run go.uber.org/mock/mockgen -package juju -destination jujuapi_mock_test.go github.com/juju/juju/api Connection