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# STACKIT Terraform Provider <br />(PRIVATE PREVIEW)

[![GitHub Release](https://img.shields.io/github/v/release/stackitcloud/terraform-provider-stackit)](https://registry.terraform.io/providers/stackitcloud/stackit/latest) ![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/stackitcloud/terraform-provider-stackit) [![GitHub License](https://img.shields.io/github/license/stackitcloud/terraform-provider-stackit)](https://www.apache.org/licenses/LICENSE-2.0)

This project is the **NOT** official [Terraform Provider](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs) for [STACKIT](https://www.stackit.de/en/)!

This a **private preview only**, which allows you to manage STACKIT resources through Terraform.

## Getting Started

To install the [STACKIT Terraform Provider](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs), copy and paste this code into your Terraform configuration. Then, run `terraform init`.

```hcl
terraform {
  required_providers {
    stackitprivatepreview = {
      source  = "tfregistry.sysops.stackit.rocks/mhenselin/stackitprivatepreview"
      version = ">= 0.1.0"
    }
  }
}

provider "stackitprivatepreview" {
  # Configuration options
}
```

Check one of the examples in the [examples](examples/) folder.

<big font-size="3rem">TODO: revise the following sections</big>

## Authentication

To authenticate, you will need a [service account](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/). Create it in the [STACKIT Portal](https://portal.stackit.cloud/) and assign the necessary permissions to it, e.g. `project.owner`. There are multiple ways to authenticate:

- Key flow (recommended)

When setting up authentication, the provider will always try to use the key flow first and search for credentials in several locations, following a specific order:

1. Explicit configuration, e.g. by setting the field `service_account_key_path` in the provider block (see example below)
2. Environment variable, e.g. by setting `STACKIT_SERVICE_ACCOUNT_KEY_PATH` or `STACKIT_SERVICE_ACCOUNT_KEY`
3. Credentials file

   The provider will check the credentials file located in the path defined by the `STACKIT_CREDENTIALS_PATH` env var, if specified,
   or in `$HOME/.stackit/credentials.json` as a fallback.
   The credentials file should be a JSON and each credential should be set using the name of the respective environment variable, as stated below in each flow. Example:

   ```json
   {
     "STACKIT_SERVICE_ACCOUNT_KEY_PATH": "path/to/sa_key.json"
   }
   ```

### Key flow

    The following instructions assume that you have created a service account and assigned the necessary permissions to it, e.g. `project.owner`.

To use the key flow, you need to have a service account key, which must have an RSA key-pair attached to it.

When creating the service account key, a new pair can be created automatically, which will be included in the service account key. This will make it much easier to configure the key flow authentication in the [STACKIT Terraform Provider](https://github.com/stackitcloud/terraform-provider-stackit), by just providing the service account key.

**Optionally**, you can provide your own private key when creating the service account key, which will then require you to also provide it explicitly to the [STACKIT Terraform Provider](https://github.com/stackitcloud/terraform-provider-stackit), additionally to the service account key. Check the STACKIT Docs for an [example of how to create your own key-pair](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/how-tos/manage-service-account-keys/).

To configure the key flow, follow this steps:

1.  Create a service account key:

   - Use the [STACKIT Portal](https://portal.stackit.cloud/): go to the `Service Accounts` tab, choose a `Service Account` and go to `Service Account Keys` to create a key. For more details, see [Create a service account key](https://docs.stackit.cloud/platform/access-and-identity/service-accounts/how-tos/manage-service-account-keys/)

2.  Save the content of the service account key by copying it and saving it in a JSON file.

    The expected format of the service account key is a **JSON** with the following structure:

    ```json
    {
      "id": "uuid",
      "publicKey": "public key",
      "createdAt": "2023-08-24T14:15:22Z",
      "validUntil": "2023-08-24T14:15:22Z",
      "keyType": "USER_MANAGED",
      "keyOrigin": "USER_PROVIDED",
      "keyAlgorithm": "RSA_2048",
      "active": true,
      "credentials": {
        "kid": "string",
        "iss": "my-sa@sa.stackit.cloud",
        "sub": "uuid",
        "aud": "string",
        (optional) "privateKey": "private key when generated by the SA service"
      }
    }
    ```

3. Configure the service account key for authentication in the provider by following one of the alternatives below:

   - setting the fields in the provider block: `service_account_key` or `service_account_key_path`
     ```hcl
     provider "stackitprivatepreview" {
        default_region           = "eu01"
        service_account_key_path = "../service_account.json"
     }
     ```
   - setting the environment variable: `STACKIT_SERVICE_ACCOUNT_KEY_PATH` or `STACKIT_SERVICE_ACCOUNT_KEY`
     - ensure the set the service account key in `STACKIT_SERVICE_ACCOUNT_KEY` is correctly formatted. Use e.g.
       `$ export STACKIT_SERVICE_ACCOUNT_KEY=$(cat ./service-account-key.json)`
   - setting `STACKIT_SERVICE_ACCOUNT_KEY_PATH` in the credentials file (see above)

> **Optionally, only if you have provided your own RSA key-pair when creating the service account key**, you also need to configure your private key (takes precedence over the one included in the service account key, if present). **The private key must be PEM encoded** and can be provided using one of the options below:
>
> - setting the field in the provider block: `private_key` or `private_key_path`
> - setting the environment variable: `STACKIT_PRIVATE_KEY_PATH` or `STACKIT_PRIVATE_KEY`
> - setting `STACKIT_PRIVATE_KEY_PATH` in the credentials file (see above)

## Backend configuration

To keep track of your terraform state, you can configure an [S3 backend](https://developer.hashicorp.com/terraform/language/settings/backends/s3) using [STACKIT Object Storage](https://docs.stackit.cloud/products/storage/object-storage).

To do so, you need an Object Storage [S3 bucket](https://docs.stackit.cloud/products/storage/object-storage/basics/concepts/#buckets) and [credentials](https://docs.stackit.cloud/products/storage/object-storage/basics/concepts/#credentials) to access it. If you need to create them, check [Create and delete Object Storage buckets](https://docs.stackit.cloud/products/storage/object-storage/how-tos/create-and-manage-object-storage-buckets/) and [Create and delete Object Storage credentials](https://docs.stackit.cloud/products/storage/object-storage/how-tos/create-and-delete-object-storage-credentials/).

Once you have everything setup, you can configure the backend by adding the following block to your Terraform configuration:

```hcl
terraform {
  backend "s3" {
    bucket = "BUCKET_NAME"
    key    = "path/to/key"
    endpoints = {
      s3 = "https://object.storage.eu01.onstackit.cloud"
    }
    region                      = "eu01"
    skip_credentials_validation = true
    skip_region_validation      = true
    skip_s3_checksum            = true
    skip_requesting_account_id  = true
    secret_key                  = "SECRET_KEY"
    access_key                  = "ACCESS_KEY"
  }
}
```

Note: AWS specific checks must be skipped as they do not work on STACKIT. For details on what those validations do, see [here](https://developer.hashicorp.com/terraform/language/settings/backends/s3#configuration).

## Acceptance Tests

> [!WARNING]
> Acceptance tests will create real resources, which may incur in costs.
> Some resource may leftover after a test run. This could happen if the tests are modified, tests are stopped during the run or losing the network connection.
> These resource must be removed manually with the [STACKIT CLI](https://github.com/stackitcloud/stackit-cli) or the STACKIT Portal.

Terraform acceptance tests are run using the command `make test-acceptance-tf`. For all services,

- The env var `TF_ACC_PROJECT_ID` must be set with the ID of the STACKIT test project to test it.
- The env var `TF_ACC_REGION` must be set with the region in which the tests should be run.
- Authentication is set as usual.
- Optionally, the env var `TF_ACC_XXXXXX_CUSTOM_ENDPOINT` (where `XXXXXX` is the uppercase name of the service) can be set to use endpoints other than the default value.
- There are some acceptance test where it is needed to provide additional parameters, some of them have default values in order to run normally without manual interaction. Those default values can be overwritten (see testutils.go for a full list.)

Additionally:

| Env var                                     | Value                                                                                                   | Example value                          | needed for Acc tests of the following services |
|---------------------------------------------|---------------------------------------------------------------------------------------------------------|----------------------------------------|------------------------------------------------|
| `TF_ACC_ORGANIZATION_ID`                    | ID of the STACKIT test organization                                                                     | `5353ccfa-a984-4b96-a71d-b863dd2b7087` | `authorization`, `iaas`                        |
| `TF_ACC_TEST_PROJECT_SERVICE_ACCOUNT_EMAIL` | Email of the STACKIT service account                                                                    | `abc-serviceaccount@sa.stackit.cloud`  | `authorization`, `resourcemanager`             |
| `TF_ACC_SERVER_ID`                          | ID of a STACKIT Server with STACKIT Server Agent enabled                                                | `5353ccfa-a984-4b96-a71d-b863dd2b7087` | `serverbackup`, `serverupdate`                 |
| `TF_ACC_TEST_PROJECT_PARENT_CONTAINER_ID`   | Container ID of the project parent container (folder within an organization or the organization itself) | `organization-d2b7087`                 | `resourcemanager`                              |
| `TF_ACC_TEST_PROJECT_PARENT_UUID`           | UUID ID of the project parent container (folder within an organization or the organization itself)      | `5353ccfa-a984-4b96-a71d-b863dd2b7087` | `resourcemanager`                              |

### Run Acceptance Tests of a single service

> [!WARNING]
> Acceptance tests will create real resources, which may incur in costs.
> Some resource may leftover after a test run. This could happen if the tests are modified, tests are stopped during the run or losing the network connection.
> These resource must be removed manually with the [STACKIT CLI](https://github.com/stackitcloud/stackit-cli) or the STACKIT Portal.

For running the acceptance tests of a single service, set the required env vars from above.
Set the env var `TF_ACC=1`, to enable the acceptance tests. 

Start the acceptance tests:

1. Configure your env vars in a file, e.g.
   ```sh
   # acc-tests.env
   export TF_ACC="1"
   export TF_ACC_REGION="eu01"
   ...
   ```
2. Read the env vars from the file
   ```sh
   source acc-tests.env
   ```
3. Start the acceptance tests
    ```sh
    $ go test -timeout=60m -v stackit/internal/services/<service>/<service>_acc_test.go
    ```

Alternative, set your env vars inline and start the acceptance test:
```sh
$ TF_ACC=1 \
  TF_ACC_PROJECT_ID=<PROJECT_ID> \
  TF_ACC_REGION=<REGION> \
  STACKIT_SERVICE_ACCOUNT_KEY_PATH=<PATH/TO/SA_KEY.json> \
  go test -timeout=60m -v stackit/internal/services/<service>/<service>_acc_test.go
```


For some services the acceptance tests take more time. By setting the timeout via the flag `-timeout=` to a higher time, you ensure that the tests will not be stopped.

## Migration

For guidance on how to migrate to using this provider, please see our [Migration Guide](./MIGRATION.md).

## Reporting Issues

If you encounter any issues or have suggestions for improvements, please open an issue in the [repository](https://github.com/stackitcloud/terraform-provider-stackit/issues).

## Contribute

Your contribution is welcome! For more details on how to contribute, refer to our [Contribution Guide](./CONTRIBUTION.md).

## Release creation

See the [release documentation](./RELEASE.md) for further information.

## License

Apache 2.0

## Useful Links

- [STACKIT Terraform Provider](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs)

- [STACKIT Portal](https://portal.stackit.cloud/)

- [STACKIT](https://www.stackit.de/en/)

- [STACKIT Docs](https://docs.stackit.cloud/)

- [STACKIT CLI](https://github.com/stackitcloud/stackit-cli/tree/main)
