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curl -k -sS -X GET "http://$KEYCLOAK_HOST/auth/admin/realms/$REALM_NAME/clients/$CLIENT_ID/client-secret" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer $ACCESS_TOKEN" |
Demo with tokens and clientId extraction for using it as serviceId
To generate a JWT token and parse a value from it demonstration.
Below, I'll outline the steps to achieve this, including generating a JWT, sending it in a request header, and then parsing a value (like `client_id`) from the JWT payload.
Generating a JWT Token using Bash
Note that this example is for educational purposes and doesn't include proper security practices like using secure keys.
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# Create JWT header and payload
header='{"alg": "HS256", "typ": "JWT"}'
payload='{"iss": "example_issuer", "sub": "1234567890", "aud": "myclient", "exp": 3000000000, "client_id": "myclient", "role": "user"}'
# Base64 encode the header and payload
header_base64=$(echo -n $header | openssl base64 -e | tr -d '=' | tr '/+' '_-')
payload_base64=$(echo -n $payload | openssl base64 -e | tr -d '=' | tr '/+' '_-')
# Create a signature
secret="your-256-bit-secret"
signature_base64=$(echo -n "${header_base64}.${payload_base64}" | openssl dgst -sha256 -hmac $secret -binary | openssl base64 -e | tr -d '=' | tr '/+' '_-')
# Combine to form the JWT
jwt="${header_base64}.${payload_base64}.${signature_base64}"
echo "JWT: $jwt" |
This script generates a JWT and prints it out. Replace "your-256-bit-secret" with a proper secret key.
Sending the JWT in a REST Request Header
You can use curl to send the JWT in a request header:
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curl -H "Authorization: Bearer $jwt" http://A1PMS/policy.. |
Parsing the JWT Payload in Java
Here's an example of how to parse the `client_id` from the JWT in Java:
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import java.util.Base64;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;
import java.io.StringReader;
public class ParseJWT {
public static void main(String[] args) {
// Assume token is passed or retrieved from headers
String token = "your.jwt.token.here";
// Split token into its parts
String[] chunks = token.split("\\.");
Base64.Decoder decoder = Base64.getUrlDecoder();
// Decode payload
String payload = new String(decoder.decode(chunks[1]));
// Parse JSON
JsonReader jsonReader = Json.createReader(new StringReader(payload));
JsonObject jsonObject = jsonReader.readObject();
jsonReader.close();
// Extract the client_id
String clientId = jsonObject.getString("client_id");
System.out.println("Client ID: " + clientId);
}
} |
In the create policy code check if there is an header and if there is a clientId use it as serviceId, other cases are covered having default serviceId (If there is no header, if there is an header but not a clientId)
TODO and topic to follow
- Evaluate the necessity of optional fields: Determine if certain optional fields can be removed or if their use can be better documented to avoid dead data.
- Consider adopting more specific schemas for critical operations: This can improve both the documentation and the generated code quality. Leverage OpenAPI Features: Use OpenAPI's advanced features like `allOf`,
- Prepare for code adaptations: Implement patterns like Adapter/Builder/Transformer to handle translations between similar objects, facilitating easier maintenance and adaptation to specification changes.
- Regular compliance checks.
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