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Add Fn::Sub support

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This commit is contained in:
Jessie Nadler 2017-06-08 15:21:32 -04:00
commit d3faaad46b
2 changed files with 53 additions and 0 deletions
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20
moto/cloudformation/parsing.py
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@ -4,6 +4,7 @@ import functools
import logging
import copy
import warnings
import re
from moto.autoscaling import models as autoscaling_models
from moto.awslambda import models as lambda_models
@ -167,6 +168,25 @@ def clean_json(resource_json, resources_map):
select_list = clean_json(resource_json['Fn::Select'][1], resources_map)
return select_list[select_index]
if 'Fn::Sub' in resource_json:
if isinstance(resource_json['Fn::Sub'], list):
warnings.warn(
"Tried to parse Fn::Sub with variable mapping but it's not supported by moto's CloudFormation implementation")
else:
fn_sub_value = clean_json(resource_json['Fn::Sub'], resources_map)
to_sub = re.findall('(?=\${)[^!^"]*?}', fn_sub_value)
literals = re.findall('(?=\${!)[^"]*?}', fn_sub_value)
for sub in to_sub:
if '.' in sub:
cleaned_ref = clean_json({'Fn::GetAtt': re.findall('(?<=\${)[^"]*?(?=})', sub)[0].split('.')}, resources_map)
else:
cleaned_ref = clean_json({'Ref': re.findall('(?<=\${)[^"]*?(?=})', sub)[0]}, resources_map)
fn_sub_value = fn_sub_value.replace(sub, cleaned_ref)
for literal in literals:
fn_sub_value = fn_sub_value.replace(literal, literal.replace('!', ''))
return fn_sub_value
pass
cleaned_json = {}
for key, value in resource_json.items():
cleaned_val = clean_json(value, resources_map)