(Java) Uni Economy API Client Credentials Flow

Demonstrates how to do OAuth 2.0 using the client credentials flow for the Uni Economy API. (This means that the server can authenticate against the identity server without human interaction.)

For more information, see https://developer.unieconomy.no/wiki/introduction/getting-started/server-application

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Step 1 ------------------------------------------------------------------------------------------
    // First create a client token...

    CkCert cert = new CkCert();
    cert.put_VerboseLogging(true);
    // Note: .pfx and .p12 files are identical.  The only difference is the file extension.
    // Also, if your .p12 password is longer than 64 chars, you'll need Chilkat v9.5.0.83 or later.
    // To shorten the password, import your .p12 onto your Windows computer by double-clicking on the .p12 file,
    // make sure when importing that keys are exportable, then re-export with private keys to a .pfx with a new password.
    boolean success = cert.LoadPfxFile("qa_data/pfx/UniCert_Norge_Test_secret.pfx","secret");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkPrivateKey privKey = cert.ExportPrivateKey();
    if (cert.get_LastMethodSuccess() == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkJwt jwt = new CkJwt();

    // Build the JOSE header
    CkJsonObject jose = new CkJsonObject();
    // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    success = jose.AppendString("alg","RS256");
    success = jose.AppendString("typ","JWT");

    // Now build the JWT claims (also known as the payload)

    // Our JWT claims will contain members as shown here:
    // {
    //   "jti": "ad612fce-3e71-4f6a-8af1-7eb0414b4eea",  <-- generated unique global identifier
    //   "sub": "99999999-aaaa-bbbb-cccc-ddddeeeeffff",  <-- This is the clientId
    //   "iat": 1588102982,  <-- These are date/time values.
    //   "nbf": 1588102982,
    //   "exp": 1588103042,
    //   "iss": " 99999999-aaaa-bbbb-cccc-ddddeeeeffff",
    //   "aud": "https://test-login.unieconomy.no/connect/token"
    // }

    // Use your own client ID.
    String myClientId = "99999999-aaaa-bbbb-cccc-ddddeeeeffff";

    CkJsonObject claims = new CkJsonObject();
    CkCrypt2 crypt = new CkCrypt2();
    claims.AppendString("jti",crypt.generateUuid());
    claims.AppendString("sub",myClientId);

    // Set the timestamp of when the JWT was created to now minus 60 seconds
    int curDateTime = jwt.GenNumericDate(-60);
    success = claims.AddIntAt(-1,"iat",curDateTime);

    // Set the "not process before" timestamp to now minus 60 seconds
    success = claims.AddIntAt(-1,"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    success = claims.AddIntAt(-1,"exp",curDateTime+3600);

    claims.AppendString("iss",myClientId);
    claims.AppendString("aud","https://test-login.unieconomy.no/connect/token");

    // Produce the smallest possible JWT:
    jwt.put_AutoCompact(true);

    // Create the JWT token.  This is where the RSA signature is created.
    String jwt_token = jwt.createJwtPk(jose.emit(),claims.emit(),privKey);

    System.out.println(jwt_token);

    // Step 2 ------------------------------------------------------------------------------------------
    CkHttp http = new CkHttp();

    // Fetch the discovery document...
    CkHttpResponse resp = http.QuickRequest("GET","https://test-login.unieconomy.no/.well-known/openid-configuration");
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    if (resp.get_StatusCode() != 200) {
        System.out.println("Received response status code " + resp.get_StatusCode());
        System.out.println("Response body containing error text or JSON:");
        System.out.println(resp.bodyStr());

        return;
        }

    CkJsonObject json = new CkJsonObject();
    success = json.Load(resp.bodyStr());

    json.put_EmitCompact(false);
    System.out.println(json.emit());

    // We have the discovery document, which contains something like this:

    // You can use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // {
    //   "issuer": "https://test-login.unieconomy.no",
    //   "jwks_uri": "https://test-login.unieconomy.no/.well-known/openid-configuration/jwks",
    //   "authorization_endpoint": "https://test-login.unieconomy.no/connect/authorize",
    //   "token_endpoint": "https://test-login.unieconomy.no/connect/token",
    //   "userinfo_endpoint": "https://test-login.unieconomy.no/connect/userinfo",
    //   "end_session_endpoint": "https://test-login.unieconomy.no/connect/endsession",
    //   "check_session_iframe": "https://test-login.unieconomy.no/connect/checksession",
    //   "revocation_endpoint": "https://test-login.unieconomy.no/connect/revocation",
    //   "introspection_endpoint": "https://test-login.unieconomy.no/connect/introspect",
    //   "device_authorization_endpoint": "https://test-login.unieconomy.no/connect/deviceauthorization",
    //   "frontchannel_logout_supported": true,
    //   "frontchannel_logout_session_supported": true,
    //   "backchannel_logout_supported": true,
    //   "backchannel_logout_session_supported": true,
    //   "scopes_supported": [
    //     "openid",
    //     "profile",
    //     "email",
    //     "offline_access",
    //     "AppFramework.All",
    //     "AppFramework",
    //     "AppFramework.Sales",
    //     "IdentityAPI",
    //     "widgetApi",
    //     "TestScope.test",
    //     "TestScope.Cars",
    //     "HaglandAPI",
    //     "LicenseAdmin",
    //     "LicenseAdmin.Product.Read",
    //     "SoftRig.Product.Write",
    //     "TestAPI.test",
    //     "offline_access"
    //   ],
    //   "claims_supported": [
    //     "sub",
    //     "updated_at",
    //     "name",
    //     "family_name",
    //     "given_name",
    //     "middle_name",
    //     "nickname",
    //     "preferred_username",
    //     "picture",
    //     "website",
    //     "gender",
    //     "birthdate",
    //     "zoneinfo",
    //     "locale",
    //     "profile",
    //     "email",
    //     "email_verified"
    //   ],
    //   "grant_types_supported": [
    //     "authorization_code",
    //     "client_credentials",
    //     "refresh_token",
    //     "implicit",
    //     "password",
    //     "urn:ietf:params:oauth:grant-type:device_code",
    //     "delegation"
    //   ],
    //   "response_types_supported": [
    //     "code",
    //     "token",
    //     "id_token",
    //     "id_token token",
    //     "code id_token",
    //     "code token",
    //     "code id_token token"
    //   ],
    //   "response_modes_supported": [
    //     "form_post",
    //     "query",
    //     "fragment"
    //   ],
    //   "token_endpoint_auth_methods_supported": [
    //     "client_secret_basic",
    //     "client_secret_post",
    //     "private_key_jwt",
    //     "private_key_jwt"
    //   ],
    //   "id_token_signing_alg_values_supported": [
    //     "RS256"
    //   ],
    //   "subject_types_supported": [
    //     "public"
    //   ],
    //   "code_challenge_methods_supported": [
    //     "plain",
    //     "S256"
    //   ],
    //   "request_parameter_supported": true
    // }

    // ------------------------------------------------------
    // The next steps are to (1) get the token_endpoint,
    // and (2) verify that the client_credentials grant type is supported.

    String tokenEndpoint = json.stringOf("token_endpoint");

    CkJsonArray grantTypes = json.ArrayOf("grant_types_supported");
    int clientCredentialsIdx = grantTypes.FindString("client_credentials",true);

    // If clientCredentialsIdx is less then zero (-1) then the "client_credentials" string was not found.
    if (clientCredentialsIdx < 0) {
        System.out.println("The client credentials grant type is not supported.");
        return;
        }

    // ------------------------------------------------------
    // Request the access token using our Client ID and JWT

    CkHttpRequest req = new CkHttpRequest();
    req.put_HttpVerb("POST");
    req.AddParam("client_id",myClientId);
    req.AddParam("scope","AppFramework.Sales");
    req.AddParam("grant_type","client_credentials");
    req.AddParam("client_assertion_type","urn:ietf:params:oauth:client-assertion-type:jwt-bearer");
    req.AddParam("client_assertion",jwt_token);

    resp = http.PostUrlEncoded(tokenEndpoint,req);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // Make sure we got a 200 response status code, otherwise it's an error.
    if (resp.get_StatusCode() != 200) {
        System.out.println("POST to token endpoint failed.");
        System.out.println("Received response status code " + resp.get_StatusCode());
        System.out.println("Response body containing error text or JSON:");
        System.out.println(resp.bodyStr());

        return;
        }

    success = json.Load(resp.bodyStr());

    System.out.println(json.emit());

    // The JSON response will look like this:

    // {
    //   "access_token": "...",
    //   "expires_in": 3600,
    //   "token_type": "Bearer",
    //   "scope": "AppFramework.Sales"
    // }

    // Get the access token:
    String accessToken = json.stringOf("access_token");
    System.out.println("accessToken = " + accessToken);

    // ------------------------------------------------------
    // Use the access token in a request.
    // We'll just send a GET request to  https://test.unieconomy.no/api/init/companies

    // Tell the http object to use the OAuth2 access token in the "Authorization: Bearer ..." header.
    http.put_AuthToken(accessToken);

    CkStringBuilder sbResponse = new CkStringBuilder();
    success = http.QuickGetSb("https://test.unieconomy.no/api/init/companies",sbResponse);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // Examine the response status code.
    if (http.get_LastStatus() != 200) {
        System.out.println(sbResponse.getAsString());
        System.out.println("response status: " + http.get_LastStatus());
        System.out.println("Received error response.");
        return;
        }

    json.LoadSb(sbResponse);
    System.out.println(json.emit());

    System.out.println("Success.");
  }
}