Load external JSON data snapshot from a URL for policy evaluation

Closes #18

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!14

Remove hard dependency on other services

Closes #9

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!13

If addresses of dependent services are not set,
the clients will return an error which will be logged
and an error message will be returned to the caller.
This allows the policy service to continue working with
policies which doesn't require the use of additional
TSA services like cache, task, signer and did resolver.

Rename get_header Rego func to external.http.header

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!12

Synchronize JSON snapshot configurations

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!11

Remove headers from Rego input variable

Closes #17

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!10

Headers can be accessed with a built-in Rego function
named get_header("header_name") instead of being a
map value inside the input.

Update regofunc names for retrieving DID verification methods

Closes #19

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!9

Issue token from OAuth server and pass it along with HTTP requests

Closes #14

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!8

Modify extension functions for signing/proofs

Closes #5 and #13

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!7

Return string when accessing a header in Rego

Closes #12

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!6

Rego extension functions to transform DID:WEB to URL and vice-versa

Closes #7

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!5

Remove unnecessary variable declaration

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!4

Make HTTP request headers accessible during policy execution

Closes #6

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!3

Accept HTTP header to specify TTL cache for policy result

Closes #8

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!2

Fix storing of policy result in cache

Closes #2

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!1