feat(kms): add keyring resource and datasource (#1049)

relates to STACKITTPR-410

stackit/internal/services/kms/keyring/datasource.go

@@ -0,0 +1,139 @@
+package kms
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/hashicorp/terraform-plugin-framework/datasource"
+	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
+	"github.com/hashicorp/terraform-plugin-log/tflog"
+	"github.com/stackitcloud/stackit-sdk-go/services/kms"
+	"github.com/stackitcloud/terraform-provider-stackit/stackit/internal/conversion"
+	"github.com/stackitcloud/terraform-provider-stackit/stackit/internal/core"
+	kmsUtils "github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/kms/utils"
+	"github.com/stackitcloud/terraform-provider-stackit/stackit/internal/utils"
+	"github.com/stackitcloud/terraform-provider-stackit/stackit/internal/validate"
+)
+
+var (
+	_ datasource.DataSource = &keyRingDataSource{}
+)
+
+func NewKeyRingDataSource() datasource.DataSource {
+	return &keyRingDataSource{}
+}
+
+type keyRingDataSource struct {
+	client       *kms.APIClient
+	providerData core.ProviderData
+}
+
+func (k *keyRingDataSource) Metadata(_ context.Context, request datasource.MetadataRequest, response *datasource.MetadataResponse) {
+	response.TypeName = request.ProviderTypeName + "_kms_keyring"
+}
+
+func (k *keyRingDataSource) Configure(ctx context.Context, request datasource.ConfigureRequest, response *datasource.ConfigureResponse) {
+	var ok bool
+	k.providerData, ok = conversion.ParseProviderData(ctx, request.ProviderData, &response.Diagnostics)
+	if !ok {
+		return
+	}
+
+	apiClient := kmsUtils.ConfigureClient(ctx, &k.providerData, &response.Diagnostics)
+	if response.Diagnostics.HasError() {
+		return
+	}
+
+	k.client = apiClient
+	tflog.Info(ctx, "KMS client configured")
+}
+
+func (k *keyRingDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, response *datasource.SchemaResponse) {
+	response.Schema = schema.Schema{
+		Description: fmt.Sprintf("KMS Keyring datasource schema. %s", core.DatasourceRegionFallbackDocstring),
+		Attributes: map[string]schema.Attribute{
+			"description": schema.StringAttribute{
+				Description: "A user chosen description to distinguish multiple keyrings.",
+				Computed:    true,
+			},
+			"display_name": schema.StringAttribute{
+				Description: "The display name to distinguish multiple keyrings.",
+				Computed:    true,
+			},
+			"keyring_id": schema.StringAttribute{
+				Description: "An auto generated unique id which identifies the keyring.",
+				Required:    true,
+				Validators: []validator.String{
+					validate.UUID(),
+					validate.NoSeparator(),
+				},
+			},
+			"id": schema.StringAttribute{
+				Description: "Terraform's internal resource ID. It is structured as \"`project_id`,`region`,`keyring_id`\".",
+				Computed:    true,
+			},
+			"project_id": schema.StringAttribute{
+				Description: "STACKIT project ID to which the keyring is associated.",
+				Required:    true,
+				Validators: []validator.String{
+					validate.UUID(),
+					validate.NoSeparator(),
+				},
+			},
+			"region": schema.StringAttribute{
+				Optional: true,
+				// must be computed to allow for storing the override value from the provider
+				Computed:    true,
+				Description: "The resource region. If not defined, the provider region is used.",
+			},
+		},
+	}
+}
+
+func (k *keyRingDataSource) Read(ctx context.Context, request datasource.ReadRequest, response *datasource.ReadResponse) { // nolint:gocritic // function signature required by Terraform
+	var model Model
+
+	diags := request.Config.Get(ctx, &model)
+	response.Diagnostics.Append(diags...)
+	if response.Diagnostics.HasError() {
+		return
+	}
+	projectId := model.ProjectId.ValueString()
+	keyRingId := model.KeyRingId.ValueString()
+	region := k.providerData.GetRegionWithOverride(model.Region)
+
+	ctx = tflog.SetField(ctx, "keyring_id", keyRingId)
+	ctx = tflog.SetField(ctx, "project_id", projectId)
+	ctx = tflog.SetField(ctx, "region", region)
+
+	keyRingResponse, err := k.client.GetKeyRing(ctx, projectId, region, keyRingId).Execute()
+	if err != nil {
+		utils.LogError(
+			ctx,
+			&response.Diagnostics,
+			err,
+			"Reading keyring",
+			fmt.Sprintf("Keyring with ID %q does not exist in project %q.", keyRingId, projectId),
+			map[int]string{
+				http.StatusForbidden: fmt.Sprintf("Project with ID %q not found or forbidden access", projectId),
+			},
+		)
+		response.State.RemoveResource(ctx)
+		return
+	}
+
+	err = mapFields(keyRingResponse, &model, region)
+	if err != nil {
+		core.LogAndAddError(ctx, &response.Diagnostics, "Error reading keyring", fmt.Sprintf("Processing API payload: %v", err))
+		return
+	}
+
+	diags = response.State.Set(ctx, &model)
+	response.Diagnostics.Append(diags...)
+	if response.Diagnostics.HasError() {
+		return
+	}
+	tflog.Info(ctx, "Key ring read")
+}