private def assumeRole()

in app/controllers/Janus.scala [209:252]
44 lines of code
2 McCabe index (conditional complexity)

  private def assumeRole(
      user: UserIdentity,
      permissionId: String,
      accessType: JanusAccessType,
      durationParams: (Option[Duration], Option[ZoneId])
  ): Option[(Credentials, Permission)] = {
    val (requestedDuration, tzOffset) = durationParams
    for {
      permission <- checkUserPermission(
        username(user),
        permissionId,
        Instant.now(),
        janusData.access,
        janusData.admin,
        janusData.support
      )
      duration = Federation.duration(
        permission,
        requestedDuration,
        tzOffset.map(Clock.system)
      )
      roleArn = Config.roleArn(permission.account.authConfigKey, configuration)
      credentials = Federation.assumeRole(
        username(user),
        roleArn,
        permission,
        stsClient,
        duration
      )
      auditLog = AuditTrail.createLog(
        user,
        permission,
        accessType,
        duration,
        janusData.access
      )
      _ = AuditTrailDB.insert(auditLog)
    } yield {
      logger.info(
        s"$accessType access to $permissionId granted for ${username(user)}"
      )
      (credentials, permission)
    }
  }