java - What are the best practices of sharing the user id among microservices? -


i have 2 spring boot microservices deployed of now:

  1. auth gateway
  2. restful services business logic.

auth gateway issues jwt token after successful login. next request, validates/authorizes jwt token before redirecting request business logic.
best way share user related information auth gateway other services?

between auth gateway written using springsecurity , spring boot.

encode necessary details (user id etc.) in jwt token.

you issue token in auth gateway , jwt access token has 3 parts: header, claims , signature

place necessary info claims section. see the example

@component public class jwttokenfactory {       private final jwtsettings settings;      @autowired     public jwttokenfactory(jwtsettings settings) {         this.settings = settings;     }      /**      * factory method issuing new jwt tokens.      *       * @param username      * @param roles      * @return      */     public accessjwttoken createaccessjwttoken(usercontext usercontext) {         if (stringutils.isblank(usercontext.getusername()))              throw new illegalargumentexception("cannot create jwt token without username");          if (usercontext.getauthorities() == null || usercontext.getauthorities().isempty())              throw new illegalargumentexception("user doesn't have privileges");          claims claims = jwts.claims().setsubject(usercontext.getusername());         claims.put("scopes", usercontext.getauthorities().stream().map(s -> s.tostring()).collect(collectors.tolist()));          datetime currenttime = new datetime();          string token = jwts.builder()           .setclaims(claims)           .setissuer(settings.gettokenissuer())           .setissuedat(currenttime.todate())           .setexpiration(currenttime.plusminutes(settings.gettokenexpirationtime()).todate())           .signwith(signaturealgorithm.hs512, settings.gettokensigningkey())         .compact();          return new accessjwttoken(token, claims);     }

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