[cli] Added additional commands to outputs (#1138)

* [cli] Added additional commands to outputs

'set' - Set one output, using user_input (pass --update to overwrite
existing outputs)

'get' - Get configured outputs for a service (includes creds) optionally
pass --decriptors to only pull certain descriptor secrets for the
service

'set-from-file' - Set numerous outputs via a json file. Can set multiple
services and descriptors (pass --update to overwrite existing outputs)

'generate-skeleton' - Use to create a skeleton json file to be used with
'set-from-file'

Signed-off-by: jack1902 <39212456+jack1902@users.noreply.github.com>

* [cli] Added 'list' to outputs

Also updated inline with PR comments

Signed-off-by: jack1902 <39212456+jack1902@users.noreply.github.com>

streamalert_cli/helpers.py

@@ -176,30 +176,9 @@ def user_input(requested_info, mask, input_restrictions):
 
     if not mask:
         while not response:
-            response = input(prompt) # nosec
-
-        # Restrict having spaces or colons in items (applies to things like
-        # descriptors, etc)
-        if isinstance(input_restrictions, re.Pattern):
-            valid_response = input_restrictions.match(response)
-            if not valid_response:
-                LOGGER.error('The supplied input should match the following '
-                             'regular expression: %s', input_restrictions.pattern)
-        elif callable(input_restrictions):
-            # Functions can be passed here to perform complex validation of input
-            # Transform the response with the validating function
-            response = input_restrictions(response)
-            valid_response = response is not None and response is not False
-            if not valid_response:
-                LOGGER.error('The supplied input failed to pass the validation '
-                             'function: %s', input_restrictions.__doc__)
-        else:
-            valid_response = not any(x in input_restrictions for x in response)
-            if not valid_response:
-                restrictions = ', '.join(
-                    '\'{}\''.format(restriction) for restriction in input_restrictions)
-                LOGGER.error('The supplied input should not contain any of the following: %s',
-                             restrictions)
+            response = input(prompt)  # nosec
+
+        valid_response = response_is_valid(response, input_restrictions)
 
         if not valid_response:
             return user_input(requested_info, mask, input_restrictions)
@@ -210,6 +189,41 @@ def user_input(requested_info, mask, input_restrictions):
     return response
 
 
+def response_is_valid(response, input_restrictions):
+    """Check if the response meets the input_restrictions
+
+    Args:
+        response (str): Description of the information needed
+
+    Returns:
+        bool: True if input_restrictions are met else False
+    """
+    valid_response = False
+    # Restrict having spaces or colons in items (applies to things like
+    # descriptors, etc)
+    if isinstance(input_restrictions, re.Pattern):
+        valid_response = input_restrictions.match(response)
+        if not valid_response:
+            LOGGER.error('The supplied input should match the following '
+                         'regular expression: %s', input_restrictions.pattern)
+    elif callable(input_restrictions):
+        # Functions can be passed here to perform complex validation of input
+        # Transform the response with the validating function
+        response = input_restrictions(response)
+        valid_response = response is not None and response is not False
+        if not valid_response:
+            LOGGER.error('The supplied input failed to pass the validation '
+                         'function: %s', input_restrictions.__doc__)
+    else:
+        valid_response = not any(x in input_restrictions for x in response)
+        if not valid_response:
+            restrictions = ', '.join(
+                '\'{}\''.format(restriction) for restriction in input_restrictions)
+            LOGGER.error('The supplied input should not contain any of the following: %s',
+                         restrictions)
+    return valid_response
+
+
 def save_parameter(region, name, value, description, force_overwrite=False):
     """Function to save the designated value to parameter store