feat: ACNA-1854 - add IMS OAuth Server to Server plugin

[shazron]

Changes 📦

• add new OAuth Server to Server (OAuth STS) plugin to handle OAuth client credentials grant type

Pending 🚧

• Need to update README in this repo

Pre-requisites 🔖

• peer dep: aio-lib-ims feat: ACNA-1854 - add getAccessTokenByClientCredentials function aio-lib-ims#110

How Has This Been Tested? 🔧

• npm test
• manual tests pending

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #69 (c08610f) into master (68c9d50) will not change coverage.
The diff coverage is 100.00%.

❗ Current head c08610f differs from pull request most recent head 9268cf9. Consider uploading reports for the commit 9268cf9 to get more accurate results

@@            Coverage Diff            @@
##            master       #69   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines          226       251   +25     
  Branches        37        41    +4     
=========================================
+ Hits           226       251   +25     

Impacted Files	Coverage Δ
src/ims-oauth_server_to_server.js	100.00% <100.00%> (ø)

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[MichaelGoberling]

Naive Q: What is the reason for there being both a sync and async function checking for supported keys? Is supports needed by another lib?

[purplecabbage]

lgtm!
tiny tiny nit pick: the copyright year in the tests file is old. copy-pasta

[shazron]

Naive Q: What is the reason for there being both a sync and async function checking for supported keys? Is supports needed by another lib?

The async version is probably to easily chain it with the async call in the ims lib. I don't recall why there is a sync version its been so long

[MichaelGoberling]

LGTM

[shazron]

tiny tiny nit pick: the copyright year in the tests file is old. copy-pasta

fixed

[shazron]

codecov is 502'ing, but coverage is 100% : https://app.codecov.io/gh/adobe/aio-lib-ims-oauth/commit/9268cf9173086576018b6613a454eea916da4f8c