script to alter a templatized swagger file so it can be pasted into a cloudformation script as a ::RestApi body value

templatize_swagger.py

import re
import json

p = re.compile("\{\{[\w]+\}\}")

input_path = '/path/to/swagger.json'
add_whitespace = False

f = open(input_path)
fw = open(input_path + '.notokens', 'w')

# use the join/split trick to get rid of whitespace greater than a single space
file_content = json.dumps(" ".join(f.read().split()))
print file_content

arr = p.findall(file_content) 

working_part = file_content[1:-1]
match_doc = "{\"Fn::Join\": [\"\", ["


for a in arr:
	# split the content of the json / swagger file on a template item like {{lambda_function_name}}.
	# part[0] = [some json without any templates]
	# part[1] = {{some_template}}
	# part[2] = everything after the first match to the regex in the document/string
	partitions = working_part.partition(a)

	# just append the non-template string to our output string
	if add_whitespace:
		match_doc = match_doc + '\t\t"' + partitions[0] + '",\n'
	else:
		match_doc = match_doc + '"' + partitions[0] + '", '

	# rewrite the template token we found so it ties into the cloudformation script
	# (note that i'm just stripping off the first & last 2 charactrs of the token '{{' and '}}')
	token = partitions[1]
	script_resource_name = token[2:-2]

	if add_whitespace:
		template_reformat = '\t\t{ "Fn::GetAtt": [ "' + script_resource_name + '", "Arn" ] },\n'
	else:
		template_reformat = '{ "Fn::GetAtt": [ "' + script_resource_name + '", "Arn" ] },'

	# append the rewritten template token to the non-template sections before it
	match_doc = match_doc + template_reformat

	#start the token search & replace process over with the remainder of the document.
	working_part = partitions[2]

# append the last working_part (document content after the last {{token}})
if add_whitespace:
	match_doc = match_doc + "\n\t\t\"" + working_part + "\"] ] }"
else:
	match_doc = match_doc + "\"" + working_part + "\"] ] }"

fw.write(match_doc)