SMART Asymmetric Key Implementation

[nickclyde]

WIP, trying to get asymmetric key auth working as described in:

• https://build.fhir.org/ig/HL7/smart-app-launch/backend-services.html
• https://build.fhir.org/ig/HL7/smart-app-launch/client-confidential-asymmetric.html#authenticating-to-the-token-endpoint
• https://docs.aidbox.app/modules/security-and-access-control/smart-on-fhir/smart-client-authentication/smart-asymmetric-private-key-jwt-authentication

Currently, trying to get an access token is returning "invalid jwt signature" from Aidbox.

[github-actions]

Coverage report for ./query-connector

St.❔	Category	Percentage	Covered / Total
🟡	Statements	60.38% (-2.51% 🔻)	1617/2678
🔴	Branches	50.17% (-2.89% 🔻)	456/909
🟡	Functions	63.12% (-0.87% 🔻)	344/545
🟡	Lines	60.19% (-2.68% 🔻)	1512/2512

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🔴	app/utils/jwt.ts	10.34%	0%	0%	10.34%
🔴	app/utils/jwks.ts	7.69%	0%	0%	7.69%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🔴	... / fhirClient.ts	24.14% (-53.64% 🔻)	12.5% (-37.5% 🔻)	55.56% (-11.11% 🔻)	22.35% (-52.65% 🔻)
🔴	... / fhir-servers.ts	31.58% (-0.85% 🔻)	15.56% (-9.44% 🔻)	42.86%	29.58% (-0.86% 🔻)

Test suite run success

156 tests passing in 20 suites.

Report generated by 🧪jest coverage report action from 45ac999