Feature: Cache generated App Store Connect JSON web tokens to disk

[priitlatt]

Sometimes App Store Connect API yields false positive results with regards to authentication. More precisely, requests signed with JSON web tokens that are generated from completely valid API keys can result in a response with status code 401 and content

Authentication credentials are missing or invalid. - Provide a properly configured and signed bearer token, and make sure that it has not expired. Learn more about Generating Tokens for API Requests https://developer.apple.com/go/?id=api-generating-tokens

To reduce the chance of this to happen, one way it to add a graceful retry logic (as is done in #178). Another way is to use JSON Web Tokens that are known to work as many times as possible. The changes in this pull request implement the latter approach.

By default App Store Connect API requests initiated by app-store-connect actions try to load JSON Web Token from a file cache instead of generating new token for each individual command invocation. This can be turned off by specifying --disable-jwt-cache option.

Affected actions:

• All actions and subactions in app-store-connect.

Examples

• Caching JWT is enabled by default:

$ app-store-connect apps get 1481211155 --verbose
[12:21:00] INFO  > Get App 1481211155
[12:21:00] DEBUG > Load JWT for App Store Connect from disk cache
[12:21:00] DEBUG > Loaded JWT for App Store Connect from disk cache
-- App --
Id: 1481211155
...

• If cache does not exist, new token is generated

$ app-store-connect apps get 1481211155 --verbose
[12:24:29] INFO  > Get App 1481211155
[12:24:29] DEBUG > Load JWT for App Store Connect from disk cache
[12:24:29] DEBUG > Failed to load App Store Connect JWT from disk cache: Token is not cached
[12:24:29] DEBUG > Generate new App Store Connect JWT
[12:24:29] DEBUG > Cached App Store Connect JWT
-- App --
Id: 1481211155
...

• Disabled JWT caching

$ app-store-connect apps get 1481211155 --verbose --disable-jwt-cache
[12:21:07] INFO  > Get App 1481211155
[12:21:07] DEBUG > Failed to load App Store Connect JWT from disk cache: Disk cache is disabled
[12:21:07] DEBUG > Generate new App Store Connect JWT
-- App --
Id: 1481211155
...

Docs related to the changes made here are in a separate PR #183.

[priitlatt]

Fixes #176 .