[keycloak-user] Example for decoding JWT Token in Shell

[Thomas Darimont]

Hello group,

just found an interesting example for decoding a JWT token in the shell.
Perhaps some of you might find that handy... see below.

Cheers,
Thomas

KC_REALM=acme-test
KC_USERNAME=tester
KC_PASSWORD=test
KC_CLIENT=app1
KC_CLIENT_SECRET=aa937217-a566-49e4-b46e-97866bad8032
KC_URL="http://localhost:8081/auth"

# Request Tokens for credentials
KC_RESPONSE=$( \
   curl -k -v \
        -d "username=$KC_USERNAME" \
        -d "password=$KC_PASSWORD" \
        -d 'grant_type=password' \
        -d "client_id=$KC_CLIENT" \
        -d "client_secret=$KC_CLIENT_SECRET" \
        "$KC_URL/realms/$KC_REALM/protocol/openid-connect/token" \
    | jq .
)

KC_ACCESS_TOKEN=$(echo $KC_RESPONSE| jq -r .access_token)
KC_ID_TOKEN=$(echo $KC_RESPONSE| jq -r .id_token)
KC_REFRESH_TOKEN=$(echo $KC_RESPONSE| jq -r .refresh_token)

# one-liner to decode access token
echo -n $KC_ACCESS_TOKEN | cut -d "." -f 2 | base64 -d | jq .

{
  "jti": "c5ed8525-f0c6-433f-9a88-ef92645582dd",
  "exp": 1473348085,
  "nbf": 0,
  "iat": 1473347785,
  "iss": "http://localhost:8081/auth/realms/acme-test",
  "aud": "app1",
  "sub": "c88e9053-89cf-4a4b-af09-c34d91d083af",
  "typ": "Bearer",
  "azp": "app1",
  "auth_time": 0,
  "session_state": "bfb1e6dd-b8c6-4379-bc47-e86c5396b06b",
  "acr": "1",
  "client_session": "db292d8b-263e-4030-9b93-a1d37e5ee5eb",
  "allowed-origins": [],
  "resource_access": {
    "app-js-demo-client": {
      "roles": [
        "user"
      ]
    },
    "account": {
      "roles": [
        "manage-account",
        "view-profile"
      ]
    }
  },
  "name": "Theo Tester",
  "preferred_username": "tester",
  "given_name": "Theo",
  "family_name": "Tester",
  "email": "tom+tester at localhost"
}
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