Correctly implement the POST credentials method

https://docs.openstack.org/api-ref/identity/v3/index.html?expanded=authenticating-with-an-application-credential-detail,create-credential-detail#credentials
specifies that the credentials endpoint expects a credential object and returns one. This patch ensures the data is properly encoded and decoded.

src/Identity/v3/Api.php

@@ -691,6 +691,7 @@ public function postCredentials(): array
  return [
  'method' => 'POST',
  'path' => 'credentials',
+ 'jsonKey' => 'credential',
  'params' => [
  'blob' => $this->params->blob(),
  'projectId' => $this->params->projectId(),
@@ -709,6 +710,15 @@ public function getCredentials(): array
  ];
  }
 
+ public function getUserCredentials(): array
+ {
+ return [
+ 'method' => 'GET',
+ 'path' => 'credentials',
+ 'params' => ['userId' => $this->params->userIdQueryUnderscore()],
+ ];
+ }
+
  public function getCredential(): array
  {
  return [

src/Identity/v3/Models/Credential.php

@@ -39,6 +39,8 @@ class Credential extends OperatorResource implements Creatable, Updateable, Retr
  'user_id' => 'userId',
  ];
 
+ protected $resourceKey = 'credential';
+
  /**
  * {@inheritdoc}
  */

src/Identity/v3/Models/User.php

@@ -97,4 +97,9 @@ public function listProjects(): \Generator
  {
  return $this->model(Project::class)->enumerate($this->api->getUserProjects(), ['id' => $this->id]);
  }
+
+ public function listCredentials(): \Generator
+ {
+ return $this->model(Credential::class)->enumerate($this->api->getUserCredentials(), ['userId' => $this->id]);
+ }
 }

src/Identity/v3/Params.php

@@ -195,6 +195,15 @@ public function userIdQuery(): array
  ];
  }
 
+ public function userIdQueryUnderscore(): array
+ {
+ return [
+ 'sentAs' => 'user_id',
+ 'location' => 'query',
+ 'description' => 'Filter by user ID',
+ ];
+ }
+
  public function domain(): array
  {
  return [

src/Identity/v3/Service.php

@@ -330,6 +330,16 @@ public function listCredentials(): \Generator
  return $this->model(Models\Credential::class)->enumerate($this->api->getCredentials());
  }
 
+ /**
+ * Returns a generator which will yield a collection of credential objects. The elements which generators yield can
+ * be accessed using a foreach loop. Often the API will not return the full state of the resource in collections;
+ * you will need to use retrieve() to pull in the full state of the remote resource from the API.
+ */
+ public function listUserCredentials(array $options): \Generator
+ {
+ return $this->model(Models\Credential::class)->enumerate($this->api->getUserCredentials(), $options);
+ }
+
  /**
  * Retrieves a credential object and populates its unique identifier object. This operation will not perform a GET
  * or HEAD request by default; you will need to call retrieve() if you want to pull in remote state from the API.