chore: create a const from the repetitive string

Signed-off-by: Shahram Kalantari <shahramk@gmail.com>

pkg/common/oras/authprovider/azure/azureidentity.go

@@ -177,7 +177,7 @@ func (d *MIAuthProvider) Provide(ctx context.Context, artifact string) (provider
 
 	response, err := client.ExchangeAADAccessTokenForACRRefreshToken(
 		ctx,
-		azcontainerregistry.PostContentSchemaGrantType("access_token"),
+		azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken),
 		artifactHostName,
 		&azcontainerregistry.AuthenticationClientExchangeAADAccessTokenForACRRefreshTokenOptions{
 			AccessToken: &d.identityToken.Token,

pkg/common/oras/authprovider/azure/azureidentity_test.go

@@ -156,7 +156,7 @@ func TestMIAuthProvider_Provide_TokenRefreshSuccess(t *testing.T) {
 	// Setup mock expectations
 	mockRegistryHostGetter.On("GetRegistryHost", "artifact_name").Return("example.azurecr.io", nil)
 	mockAuthClientFactory.On("CreateAuthClient", "https://example.azurecr.io", mock.Anything).Return(mockAuthClient, nil)
-	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType("access_token"), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
+	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
 	mockManagedIdentityTokenGetter.On("GetManagedIdentityToken", mock.Anything, "clientID").Return(newAADToken, nil)
 
 	// Initialize provider with expired token

pkg/common/oras/authprovider/azure/azureworkloadidentity.go

@@ -180,7 +180,7 @@ func (d *WIAuthProvider) Provide(ctx context.Context, artifact string) (provider
 	startTime := time.Now()
 	response, err := client.ExchangeAADAccessTokenForACRRefreshToken(
 		ctx,
-		azcontainerregistry.PostContentSchemaGrantType("access_token"),
+		azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken),
 		artifactHostName,
 		&azcontainerregistry.AuthenticationClientExchangeAADAccessTokenForACRRefreshTokenOptions{
 			AccessToken: &d.aadToken.AccessToken,

pkg/common/oras/authprovider/azure/azureworkloadidentity_test.go

@@ -69,7 +69,7 @@ func TestWIAuthProvider_Provide_Success(t *testing.T) {
 	// Set expectations for mocked functions
 	mockRegistryHostGetter.On("GetRegistryHost", "artifact_name").Return("example.azurecr.io", nil)
 	mockAuthClientFactory.On("CreateAuthClient", "https://example.azurecr.io", mock.Anything).Return(mockAuthClient, nil)
-	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType("access_token"), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
+	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
 	mockAADAccessTokenGetter.On("GetAADAccessToken", mock.Anything, "tenantID", "clientID", mock.Anything).Return(initialToken, nil)
 	mockMetricsReporter.On("ReportMetrics", mock.Anything, mock.Anything, "example.azurecr.io").Return()
 
@@ -113,7 +113,7 @@ func TestWIAuthProvider_Provide_RefreshToken(t *testing.T) {
 	// Set expectations for mocked functions
 	mockRegistryHostGetter.On("GetRegistryHost", "artifact_name").Return("example.azurecr.io", nil)
 	mockAuthClientFactory.On("CreateAuthClient", "https://example.azurecr.io", mock.Anything).Return(mockAuthClient, nil)
-	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType("access_token"), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
+	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
 	mockAADAccessTokenGetter.On("GetAADAccessToken", mock.Anything, "tenantID", "clientID", mock.Anything).Return(newToken, nil)
 	mockMetricsReporter.On("ReportMetrics", mock.Anything, mock.Anything, "example.azurecr.io").Return()
 
@@ -225,7 +225,7 @@ func TestWIAuthProvider_Provide_TokenRefresh_Success(t *testing.T) {
 	// Set expectations
 	mockRegistryHostGetter.On("GetRegistryHost", "artifact_name").Return("example.azurecr.io", nil)
 	mockAuthClientFactory.On("CreateAuthClient", "https://example.azurecr.io", mock.Anything).Return(mockAuthClient, nil)
-	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType("access_token"), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
+	mockAuthClient.On("ExchangeAADAccessTokenForACRRefreshToken", mock.Anything, azcontainerregistry.PostContentSchemaGrantType(GrantTypeAccessToken), "example.azurecr.io", mock.Anything).Return(refreshToken, nil)
 	mockAADAccessTokenGetter.On("GetAADAccessToken", mock.Anything, "tenantID", "clientID", mock.Anything).Return(newToken, nil)
 	mockMetricsReporter.On("ReportMetrics", mock.Anything, mock.Anything, "example.azurecr.io").Return()
 

pkg/common/oras/authprovider/azure/helper.go

@@ -22,6 +22,8 @@ import (
 	provider "github.com/ratify-project/ratify/pkg/common/oras/authprovider"
 )
 
+const GrantTypeAccessToken = "access_token"
+
 // AuthClientFactory defines an interface for creating an authentication client.
 type AuthClientFactory interface {
 	CreateAuthClient(serverURL string, options *azcontainerregistry.AuthenticationClientOptions) (AuthClient, error)