iam_server_certificate_facts: list all certs

If a server name isn't passed, retrieve all server certificates by
default. Change return value to a dict with the server_cert_name being
the key.

lib/ansible/modules/extras/cloud/amazon/iam_server_certificate_facts.py

@@ -94,8 +94,8 @@ except ImportError:
     HAS_BOTO3 = False
 
 
-def get_server_cert(iam, name=None):
-    """Retrieve the attributes of a server certificate if it exists
+def get_server_certs(iam, name=None):
+    """Retrieve the attributes of a server certificate if it exists or all certs.
     Args:
         iam (botocore.client.IAM): The boto3 iam instance.
 
@@ -107,7 +107,6 @@ def get_server_cert(iam, name=None):
         >>> iam = boto3.client('iam')
         >>> name = "server-cert-name"
         >>> results = get_server_cert(iam, name)
-        [
         {
             "upload_date": "2015-04-25T00:36:40+00:00",
             "server_certificate_id": "ADWAJXWTZAXIPIMQHMJPO",
@@ -117,13 +116,19 @@ def get_server_cert(iam, name=None):
             "path": "/",
             "arn": "arn:aws:iam::911277865346:server-certificate/server-cert-name"
         }
-        ]
     """
-    results = []
+    results = dict()
     try:
-        server_cert = iam.get_server_certificate(ServerCertificateName=name)['ServerCertificate']
+        if name:
+            server_certs = [iam.get_server_certificate(ServerCertificateName=name)['ServerCertificate']]
+        else:
+            server_certs = iam.list_server_certificates()['ServerCertificateMetadataList']
+
+        for server_cert in server_certs:
+            if not name:
+                server_cert = iam.get_server_certificate(ServerCertificateName=server_cert['ServerCertificateName'])['ServerCertificate']
             cert_md = server_cert['ServerCertificateMetadata']
-        cert_data = {
+            results[cert_md['ServerCertificateName']] = {
                 'certificate_body': server_cert['CertificateBody'],
                 'server_certificate_id': cert_md['ServerCertificateId'],
                 'server_certificate_name': cert_md['ServerCertificateName'],
@@ -132,16 +137,16 @@ def get_server_cert(iam, name=None):
                 'expiration': cert_md['Expiration'].isoformat(),
                 'upload_date': cert_md['UploadDate'].isoformat(),
             }
-        results.append(cert_data)
 
     except botocore.exceptions.ClientError:
         pass
+
     return results
 
 def main():
     argument_spec = ec2_argument_spec()
     argument_spec.update(dict(
-        name=dict(required=True, type='str'),
+        name=dict(type='str'),
     ))
 
     module = AnsibleModule(argument_spec=argument_spec,)