Adding secretV1Data resource (hashicorp#2604)

* Adding secretV1Data resource

* Refactored to use 'any' instead of 'interface{}' in secret_v1_data

.changelog/2604.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+Adding the `kubernetes_secret_v1_data` resource to the kubernetes provider. This resource will allow users to manage kubernetes secrets
+```

docs/resources/secret_v1_data.md

@@ -0,0 +1,58 @@
+---
+subcategory: "core/v1"
+page_title: "Kubernetes: kubernetes_secret_v1_data"
+description: |-
+  This resource allows Terraform to manage the data for a Secret that already exists.
+---
+
+# kubernetes_secret_v1_data
+
+This resource allows Terraform to manage data within a pre-existing Secret. This resource uses [field management](https://kubernetes.io/docs/reference/using-api/server-side-apply/#field-management) and [server-side apply](https://kubernetes.io/docs/reference/using-api/server-side-apply/) to manage only the data that is defined in the Terraform configuration. Existing data not specified in the configuration will be ignored. If data specified in the config is already managed by another client, it will cause a conflict which can be overridden by setting `force` to true.
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `data` (Map of String) The data we want to add to the Secret.
+- `metadata` (Block List, Min: 1, Max: 1) (see [below for nested schema](#nestedblock--metadata))
+
+### Optional
+
+- `field_manager` (String) Set the name of the field manager for the specified labels.
+- `force` (Boolean) Force overwriting data that is managed outside of Terraform.
+
+### Read-Only
+
+- `id` (String) The ID of this resource.
+
+<a id="nestedblock--metadata"></a>
+### Nested Schema for `metadata`
+
+Required:
+
+- `name` (String) The name of the Secret.
+
+Optional:
+
+- `namespace` (String) The namespace of the Secret.
+
+## Example Usage
+
+```terraform
+resource "kubernetes_secret_v1_data" "example" {
+  metadata {
+    name = "my-secret"
+  }
+  data = {
+    "username" = "admin"
+    "password" = "s3cr3t"
+  }
+}
+```
+
+## Import
+
+This resource does not support the `import` command. As this resource operates on Kubernetes resources that already exist, creating the resource is equivalent to importing it.
+
+

kubernetes/provider.go

@@ -264,6 +264,7 @@ func Provider() *schema.Provider {
 			"kubernetes_config_map_v1_data":         resourceKubernetesConfigMapV1Data(),
 			"kubernetes_secret":                     resourceKubernetesSecretV1(),
 			"kubernetes_secret_v1":                  resourceKubernetesSecretV1(),
+			"kubernetes_secret_v1_data":             resourceKubernetesSecretV1Data(),
 			"kubernetes_pod":                        resourceKubernetesPodV1(),
 			"kubernetes_pod_v1":                     resourceKubernetesPodV1(),
 			"kubernetes_endpoints":                  resourceKubernetesEndpointsV1(),

kubernetes/resource_kubernetes_secret_v1_data.go

@@ -0,0 +1,245 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package kubernetes
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+
+	"k8s.io/apimachinery/pkg/api/errors"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/utils/ptr"
+)
+
+func resourceKubernetesSecretV1Data() *schema.Resource {
+	return &schema.Resource{
+		CreateContext: resourceKubernetesSecretV1DataCreate,
+		ReadContext:   resourceKubernetesSecretV1DataRead,
+		UpdateContext: resourceKubernetesSecretV1DataUpdate,
+		DeleteContext: resourceKubernetesSecretV1DataDelete,
+
+		Schema: map[string]*schema.Schema{
+			"metadata": {
+				Type:        schema.TypeList,
+				Description: "Metadata for the kubernetes Secret.",
+				Required:    true,
+				MaxItems:    1,
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"name": {
+							Type:        schema.TypeString,
+							Description: "The name of the Secret.",
+							Required:    true,
+							ForceNew:    true,
+						},
+						"namespace": {
+							Type:        schema.TypeString,
+							Description: "The namespace of the Secret.",
+							Optional:    true,
+							ForceNew:    true,
+							Default:     "default",
+						},
+					},
+				},
+			},
+			"data": {
+				Type:        schema.TypeMap,
+				Description: "Data to be stored in the Kubernetes Secret.",
+				Required:    true,
+				Elem: &schema.Schema{
+					Type: schema.TypeString,
+				},
+			},
+			"force": {
+				Type:        schema.TypeBool,
+				Description: "Flag to force updates to the Kubernetes Secret.",
+				Optional:    true,
+			},
+			"field_manager": {
+				Type:        schema.TypeString,
+				Description: "Set the name of the field manager for the specified labels",
+				Optional:    true,
+				Default:     defaultFieldManagerName,
+			},
+		},
+	}
+}
+
+func resourceKubernetesSecretV1DataCreate(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
+	metadata := expandMetadata(d.Get("metadata").([]any))
+	// Sets the resource id based on the metadata
+	d.SetId(buildId(metadata))
+
+	//Calling the update function ensuring resource config is correct
+	diag := resourceKubernetesSecretV1DataUpdate(ctx, d, m)
+	if diag.HasError() {
+		d.SetId("")
+	}
+	return diag
+}
+
+// Retrieves the current state of the k8s secret, and update the current sate
+func resourceKubernetesSecretV1DataRead(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
+	conn, err := m.(KubeClientsets).MainClientset()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	namespace, name, err := idParts(d.Id())
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	// getting the secret data
+	res, err := conn.CoreV1().Secrets(namespace).Get(ctx, name, v1.GetOptions{})
+	if err != nil {
+		if errors.IsNotFound(err) {
+			return diag.Diagnostics{{
+				Severity: diag.Warning,
+				Summary:  "Secret deleted",
+				Detail:   fmt.Sprintf("The underlying secret %q has been deleted. You should recreate the underlying secret, or remove it from your configuration.", name),
+			}}
+		}
+		return diag.FromErr(err)
+	}
+
+	configuredData := d.Get("data").(map[string]any)
+
+	// stripping out the data not managed by Terraform
+	fieldManagerName := d.Get("field_manager").(string)
+
+	managedSecretData, err := getManagedSecretData(res.GetManagedFields(), fieldManagerName)
+	if err != nil {
+		return diag.FromErr(err)
+	}
+	data := res.Data
+	for k := range data {
+		_, managed := managedSecretData["f:"+k]
+		_, configured := configuredData[k]
+		if !managed && !configured {
+			delete(data, k)
+		}
+
+	}
+	decodedData := make(map[string]string, len(data))
+	for k, v := range data {
+		decodedData[k] = string(v)
+	}
+
+	d.Set("data", decodedData)
+
+	return nil
+}
+
+// getManagedSecretData reads the field manager metadata to discover which fields we're managing
+func getManagedSecretData(managedFields []v1.ManagedFieldsEntry, manager string) (map[string]interface{}, error) {
+	var data map[string]any
+	for _, m := range managedFields {
+		// Only consider entries managed by the specified manager
+		if m.Manager != manager {
+			continue
+		}
+		var mm map[string]any
+		err := json.Unmarshal(m.FieldsV1.Raw, &mm)
+		if err != nil {
+			return nil, err
+		}
+		// Check if the "data" field exists and extract it
+		if l, ok := mm["f:data"].(map[string]any); ok {
+			data = l
+		}
+	}
+	return data, nil
+}
+
+func resourceKubernetesSecretV1DataUpdate(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
+	conn, err := m.(KubeClientsets).MainClientset()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	metadata := expandMetadata(d.Get("metadata").([]any))
+	name := metadata.GetName()
+	namespace := metadata.GetNamespace()
+
+	_, err = conn.CoreV1().Secrets(namespace).Get(ctx, name, v1.GetOptions{})
+	if err != nil {
+		if d.Id() == "" {
+			// If we are deleting then there is nothing to do if the resource is gone
+			return nil
+		}
+		if statusErr, ok := err.(*errors.StatusError); ok && errors.IsNotFound(statusErr) {
+			return diag.Errorf("The Secret %q does not exist", name)
+		}
+		return diag.Errorf("Have got the following error while validating the existence of the Secret %q: %v", name, err)
+	}
+
+	// Craft the patch to update the data
+	data := d.Get("data").(map[string]any)
+	if d.Id() == "" {
+		// If we're deleting then we just patch with an empty data map
+		data = map[string]interface{}{}
+	}
+
+	encodedData := make(map[string][]byte, len(data))
+	for k, v := range data {
+		encodedData[k] = []byte(v.(string))
+	}
+
+	patchobj := map[string]any{
+		"apiVersion": "v1",
+		"kind":       "Secret",
+		"metadata": map[string]any{
+			"name":      name,
+			"namespace": namespace,
+		},
+		"data": encodedData,
+	}
+	patch := unstructured.Unstructured{}
+	patch.Object = patchobj
+	patchbytes, err := patch.MarshalJSON()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	// Apply the patch
+	_, err = conn.CoreV1().Secrets(namespace).Patch(ctx,
+		name,
+		types.ApplyPatchType,
+		patchbytes,
+		v1.PatchOptions{
+			FieldManager: d.Get("field_manager").(string),
+			Force:        ptr.To(d.Get("force").(bool)),
+		},
+	)
+	if err != nil {
+		if errors.IsConflict(err) {
+			return diag.Diagnostics{{
+				Severity: diag.Error,
+				Summary:  "Field manager conflict",
+				Detail:   fmt.Sprintf("Another client is managing a field Terraform tried to update. Set 'force' to true to override: %v", err),
+			}}
+		}
+		return diag.FromErr(err)
+	}
+
+	if d.Id() == "" {
+		return nil
+	}
+
+	return resourceKubernetesSecretV1DataRead(ctx, d, m)
+}
+
+func resourceKubernetesSecretV1DataDelete(ctx context.Context, d *schema.ResourceData, m interface{}) diag.Diagnostics {
+	// sets resource id to an empty. Simulating the deletion.
+	d.SetId("")
+	// Now we are calling the update function, to update the resource state
+	return resourceKubernetesSecretV1DataUpdate(ctx, d, m)
+}