Added GetParameter support

moto/ssm/models.py

@@ -75,6 +75,11 @@ class SimpleSystemManagerBackend(BaseBackend):
                 result.append(self._parameters[name])
         return result
 
+    def get_parameter(self, name, with_decryption):
+        if name in self._parameters:
+            return self._parameters[name]
+        return None
+
     def put_parameter(self, name, description, value, type, keyid, overwrite):
         if not overwrite and name in self._parameters:
             return

moto/ssm/responses.py

@@ -42,6 +42,25 @@ class SimpleSystemManagerResponse(BaseResponse):
                 response['InvalidParameters'].append(name)
         return json.dumps(response)
 
+    def get_parameter(self):
+        name = self._get_param('Name')
+        with_decryption = self._get_param('WithDecryption')
+
+        result = self.ssm_backend.get_parameter(name, with_decryption)
+
+        if result is None:
+            return '', dict(status=400)
+
+        response = {
+            'Parameter': {
+                'Name': name,
+                'Type': result.type,
+                'Value': result.value
+            }
+        }
+
+        return json.dumps(response)
+
     def get_parameters(self):
         names = self._get_param('Names')
         with_decryption = self._get_param('WithDecryption')

tests/test_ssm/test_ssm_boto3.py

@@ -66,6 +66,25 @@ def test_put_parameter():
     response['Parameters'][0]['Type'].should.equal('String')
 
 
+@mock_ssm
+def test_get_parameter():
+    client = boto3.client('ssm', region_name='us-east-1')
+
+    client.put_parameter(
+        Name='test',
+        Description='A test parameter',
+        Value='value',
+        Type='String')
+
+    response = client.get_parameter(
+        Name='test',
+        WithDecryption=False)
+
+    response['Parameter']['Name'].should.equal('test')
+    response['Parameter']['Value'].should.equal('value')
+    response['Parameter']['Type'].should.equal('String')
+
+
 @mock_ssm
 def test_describe_parameters():
     client = boto3.client('ssm', region_name='us-east-1')