fix: "Invalid permissions on Lambda function" on path parameter

[53ningen]

Issue #, if available:
#110

Description of changes:
fix the issue #110

Description of how you validated changes:
Deployed the following template successfully on CloudFormation.
Also I confirmed deployed APIs works well.

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Events:
        HttpGetUserExampleExample:
          Type: Api
          Properties:
            Path: '/users/example/example'
            Method: GET
        HttpGetUserGroupIdUserId:
          Type: Api
          Properties:
            Path: '/users/{groupId}/{userId}'
            Method: GET
        HttpGetGroupAster:
          Type: Api
          Properties:
            Path: '/groups/{proxy+}'
            Method: GET

Checklist:

• Write/update tests
  • If this pull request is on the right path, I will add some tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@275e461). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop     #992   +/-   ##
==========================================
  Coverage           ?   94.81%           
==========================================
  Files              ?       69           
  Lines              ?     3240           
  Branches           ?      631           
==========================================
  Hits               ?     3072           
  Misses             ?       87           
  Partials           ?       81

Impacted Files	Coverage Δ
samtranslator/model/eventsources/push.py	88.46% <100%> (ø)

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[53ningen]

Resource's path part only allow a-zA-Z0-9._- and curly braces at the beginning and the end.

[praneetap]

Thanks for this contribution! This pr is against develop which is correct, could you please add tests as well?

[53ningen]

Thank you for your response.
I will add some tests soon.

[53ningen]

@praneetap

I've added tests.

[53ningen]

rebased on current develop branch

[brettstack]

Thanks! Could you also add an input/output test?

[53ningen]

@brettstack
Thank you for your response.
Does an input/output test mean like this...? 9208fde
Let me know if it is wrong.

Thanks.