ec_extension: implement extension resource

docs/resources/ec_extension.md

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+---
+page_title: "Elastic Cloud: ec_extension"
+description: |-
+  Provides an Elastic Cloud extension resource, which allows extension to be created, updated, and deleted.
+---
+
+# Resource: ec_extension
+Provides an Elastic Cloud extension resource, which allows extension to be created, updated, and deleted.
+
+Extensions allow users of Elastic Cloud to use custom plugins, scripts, or dictionaries to enhance the core functionality of Elasticsearch. Before you install an extension, be sure to check out the supported and official [Elasticsearch plugins](https://www.elastic.co/guide/en/elasticsearch/plugins/current/index.html) already available.
+
+## Example Usage
+### with extension file
+
+```hcl
+locals {
+  file_path = "/path/to/plugin.zip"
+}
+
+resource "ec_extension" "example_extension" {
+  name           = "my_extension"
+  description    = "my extension"
+  version        = "*"
+  extension_type = "bundle"
+
+  file_path = local.file_path
+  file_hash = filebase64sha256(local.file_path)
+}
+```
+
+### with download URL
+```hcl
+resource "ec_extension" "example_extension" {
+  name           = "my_extension"
+  description    = "my extension"
+  version        = "*"
+  extension_type = "bundle"
+  download_url   = "https://example.net"
+}
+```
+
+## Argument Reference
+The following arguments are supported:
+
+* `name` - (Required) Name of the extension. 
+* `description` - (Optional) Description of the extension.
+* `extension_type` - (Required) `bundle` or `plugin` allowed. A `bundle`  will usually contain a dictionary or script, where a `plugin` is compiled from source.
+* `version` - (Required) Elastic stack version, a numeric version for plugins, e.g. 2.3.0 should be set. Major version e.g. 2.*, or wildcards e.g. * for bundles.
+* `download_url` - (Optional) The URL to download the extension archive.
+* `file_path` - (Optional) File path of the extension uploaded.
+* `file_hash` - (Optional) Hash value of the file. If it is changed, the file is reuploaded. 
+
+
+## Attributes Reference
+In addition to all the arguments above, the following attributes are exported:
+
+* `id` - Extension identifier.
+* `url` - The extension URL to be used in the plan.
+* `last_modified` - The datetime the extension was last modified.
+* `size` - The extension file size in bytes.

ec/acc/extension_basic_test.go

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+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package acc
+
+import (
+	"fmt"
+	"io/ioutil"
+	"testing"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/acctest"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+)
+
+func TestAccExtension_basic(t *testing.T) {
+	resName := "ec_extension.my_extension"
+	randomName := prefix + acctest.RandStringFromCharSet(10, acctest.CharSetAlphaNum)
+
+	cfg := fixtureAccExtensionBasicWithTF(t, "testdata/extension_basic.tf", randomName, "desc")
+	cfg2 := fixtureAccExtensionBasicWithTF(t, "testdata/extension_basic.tf", randomName, "updated desc")
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t) },
+		ProviderFactories: testAccProviderFactory,
+		CheckDestroy:      testAccExtensionDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: cfg,
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr(resName, "name", randomName),
+					resource.TestCheckResourceAttr(resName, "version", "*"),
+					resource.TestCheckResourceAttr(resName, "description", "desc"),
+					resource.TestCheckResourceAttr(resName, "extension_type", "bundle"),
+				),
+			},
+			{
+				Config: cfg2,
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr(resName, "name", randomName),
+					resource.TestCheckResourceAttr(resName, "version", "*"),
+					resource.TestCheckResourceAttr(resName, "description", "updated desc"),
+					resource.TestCheckResourceAttr(resName, "extension_type", "bundle"),
+				),
+			},
+		},
+	})
+}
+
+func fixtureAccExtensionBasicWithTF(t *testing.T, tfFileName, extensionName, description string) string {
+	t.Helper()
+
+	b, err := ioutil.ReadFile(tfFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return fmt.Sprintf(string(b),
+		extensionName, description,
+	)
+}

ec/acc/extension_bundle_file_test.go

@@ -0,0 +1,177 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package acc
+
+import (
+	"archive/zip"
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/elastic/cloud-sdk-go/pkg/client/extensions"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/acctest"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
+)
+
+func TestAccExtension_bundleFile(t *testing.T) {
+	resName := "ec_extension.my_extension"
+	randomName := prefix + acctest.RandStringFromCharSet(10, acctest.CharSetAlphaNum)
+
+	filePath := filepath.Join(os.TempDir(), "extension.zip")
+	defer os.Remove(filePath)
+
+	cfg := fixtureAccExtensionBundleWithTF(t, "testdata/extension_bundle_file.tf", filePath, randomName, "desc")
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t) },
+		ProviderFactories: testAccProviderFactory,
+		CheckDestroy:      testAccExtensionDestroy,
+		Steps: []resource.TestStep{
+			{
+				PreConfig: func() { writeFile(t, filePath, "extension.txt", "foo") },
+				Config:    cfg,
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr(resName, "name", randomName),
+					resource.TestCheckResourceAttr(resName, "version", "*"),
+					resource.TestCheckResourceAttr(resName, "description", "desc"),
+					resource.TestCheckResourceAttr(resName, "extension_type", "bundle"),
+					resource.TestCheckResourceAttr(resName, "file_path", filePath),
+					func(s *terraform.State) error {
+						return checkExtensionFile(t, s, "extension.txt", "foo")
+					},
+				),
+			},
+			{
+				PreConfig: func() { writeFile(t, filePath, "extension.txt", "bar") },
+				Config:    cfg,
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr(resName, "name", randomName),
+					resource.TestCheckResourceAttr(resName, "version", "*"),
+					resource.TestCheckResourceAttr(resName, "description", "desc"),
+					resource.TestCheckResourceAttr(resName, "extension_type", "bundle"),
+					resource.TestCheckResourceAttr(resName, "file_path", filePath),
+					func(s *terraform.State) error {
+						return checkExtensionFile(t, s, "extension.txt", "bar")
+					},
+				),
+			},
+		},
+	})
+}
+
+func fixtureAccExtensionBundleWithTF(t *testing.T, tfFileName, bundleFilePath, extensionName, description string) string {
+	t.Helper()
+
+	b, err := ioutil.ReadFile(tfFileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return fmt.Sprintf(string(b),
+		bundleFilePath, extensionName, description,
+	)
+}
+
+func writeFile(t *testing.T, filePath, fileName, content string) {
+	t.Helper()
+
+	buf := new(bytes.Buffer)
+	writer := zip.NewWriter(buf)
+
+	f, err := writer.Create(fileName)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := f.Write([]byte(content)); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := ioutil.WriteFile(filePath, buf.Bytes(), 0644); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func checkExtensionFile(t *testing.T, s *terraform.State, filename string, expected string) error {
+	client, err := newAPI()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, rs := range s.RootModule().Resources {
+		if rs.Type != "ec_extension" {
+			continue
+		}
+
+		res, err := client.V1API.Extensions.GetExtension(
+			extensions.NewGetExtensionParams().WithExtensionID(rs.Primary.ID),
+			client.AuthWriter)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		content, err := downloadAndReadExtension(filename, res.Payload.FileMetadata.URL.String(), res.Payload.FileMetadata.Size)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if content == expected {
+			return nil // ok
+		}
+		return fmt.Errorf("extension content is expected: %s, but got: %s", expected, content)
+	}
+
+	return fmt.Errorf("extension doesn't exists")
+}
+
+func downloadAndReadExtension(filename string, url string, size int64) (string, error) {
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", err
+	}
+
+	b, _ := ioutil.ReadAll(resp.Body)
+	defer resp.Body.Close()
+
+	r, err := zip.NewReader(bytes.NewReader(b), size)
+	if err != nil {
+		return "", err
+	}
+
+	if len(r.File) == 0 {
+		return "", fmt.Errorf("the zip file has no content")
+	}
+
+	for _, f := range r.File {
+		reader, _ := f.Open()
+		b, _ := ioutil.ReadAll(reader)
+		func() { defer reader.Close() }()
+		if filename == f.Name {
+			return string(b), nil
+		}
+	}
+	return "", fmt.Errorf("not found: %s", filename)
+}

ec/acc/extension_destroy_test.go

@@ -0,0 +1,52 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package acc
+
+import (
+	"fmt"
+
+	"github.com/elastic/cloud-sdk-go/pkg/api/apierror"
+	"github.com/elastic/cloud-sdk-go/pkg/client/extensions"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
+)
+
+func testAccExtensionDestroy(s *terraform.State) error {
+	client, err := newAPI()
+	if err != nil {
+		return err
+	}
+
+	for _, rs := range s.RootModule().Resources {
+		if rs.Type != "ec_extension" {
+			continue
+		}
+
+		res, err := client.V1API.Extensions.GetExtension(
+			extensions.NewGetExtensionParams().WithExtensionID(rs.Primary.ID),
+			client.AuthWriter)
+
+		// If not extension exists, api gets 403 error
+		if err != nil && apierror.IsRuntimeStatusCode(err, 403) {
+			continue
+		}
+
+		return fmt.Errorf("extension (%s) still exists", *res.Payload.ID)
+	}
+
+	return nil
+}