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In this tutorial, you will learn how to get an access token from the Keycloak authorization server using the OAuth Authority Code Grant catamenia. You should employ this potency flow but if your application support redirects. For example, if your application is a Web awarding or a mobile application, then this potency grant flow is a recommended one to use.

For video lessons on how to secure your Spring Boot application with OAuth 2.0. and Spring Security 5, delight checkout my complete video form OAuth 2.0. in Jump Boot applications.

To follow this tutorial, yous will need to accept the Keycloak server running, a Keycloak Realm, and at least 1 user created. If you practise not accept Keycloak server running yet or did not create a user, please follow these two tutorials:

• Keycloak: Starting a Standalone Server,
• Keycloak: Creating a new user.

If you lot are interested to learn how to implement the OAuth Password Grant flow, delight follow the beneath tutorial:

• Keycloak: Requesting Token with a Countersign Grant menses

Enable the Dominance Code Flow

To be able to use the OAuth Potency Code Grant Flow, you volition need to enable information technology in the Keycloak admin panel for the OAuth Client.

1. Login to Keycloak Assistants Console,
2. Switch to utilise the needed Realm,
3. Follow the steps below to enable the OAuth Authorization Lawmaking Grant Flow.

For this tutorial, I have created a new OAuth Customer chosen "photo-app-code-flow-customer" in my custom Realm called "Appsdeveloperblog".

Open the OAuth client for which yous would similar to enable the Potency Code Grant period and plough on the "Standard Flow Enabled" option every bit information technology is shown in the prototype beneath.

Once the Standard Menstruum is enabled for the OAuth Client, you lot can use this client to request the OAuth Authority code.

Requesting OAuth Authorization Code

Before sending a asking for an OAuth Authorisation code, brand sure that the Keycloak server is running.

Below is an example of a request URL that yous tin open in the browser windows to request an OAuth Authorization Code. Replace the parameter values with the ones relevant to your project.

Request

http://localhost:8080/auth/realms/appsdeveloperblog/protocol/openid-connect/auth ?client_id=photograph-app-code-flow-client &response_type=code &state=fj8o3n7bdy1op5

Where:

• http://localhost:8080 – is the domain and the port number on which the Keycloak server is running,
• appsdeveloperblog – is a Realm name I take created in Keycloak for my project. In your case, the Realm name will be different. If yous demand to learn how to create a new Realm and a new user, please follow this tutorial: "Keycloak: Creating a New User",
• photo-app-code-menstruation-client – is an OAuth client_id. You create OAuth clients in the Keycloak server. The client_id is a required parameter for the OAuth Lawmaking Grant flow,
• lawmaking – is a response_type (OAuth Response Type). This value must be "code" for the OAuth Code Grant menstruum to work. If you lot provide a different value here, the request will not piece of work. The response_type is a required parameter in OAuth Lawmaking Grant flow,
• fj8o3n7bdy1op5 – is a RECOMMENDED, opaque value used by the client to maintain land between the request and callback. You will demand to generate this random alphanumeric cord of characters and include them in the request. The authorization server includes this value when redirecting the user-agent back to the client. The parameter SHOULD be used for preventing cross-site request forgery. The page that handles the response from the authorization server volition need to read this value and compare it to the original one that was sent with this request. The two values must match.

Response

In the case of a successful asking, the authorization server will generate the authorization code and will redirect the client awarding to a Redirect URIconfigured in the Keycloak server for this OAuth client.

http://localhost:8081/callback ?state=fj8o3n7bdy1op5 &session_state=f109bb89-cd34-4374-b084-c3c1cf2c8a0b &lawmaking=0aaca7b5-a314-4c07-8212-818cb4b7e8d0.f109bb89-cd34-4374-b084-c3c1cf2c8a0b.1dc15d06-d8b9-4f0f-a042-727eaa6b98f7

Optional Request Parameters

A request for an authorisation code tin can include other optional parameters:

• telescopic – OPTIONAL. The scope of the access request,
• redirect_uri – OPTIONAL. After completing its interaction with the resource owner, the authorization server directs the resource owner's user-agent back to the client. The authorization server redirects the user-agent to the client's redirection endpoint previously established with the authority server during the customer registration process or when making the authorization request. Yous will configure the redirect_uriwhen creating a new OAuth Customer in the Keycloak potency server. If you lot include this request parameter in the request, then its value must match the 1 configured in the Keycloak authorization server. Otherwise, an error will accept place.

Below is a Request URL that contains all required, recommended, and optional request parameters you can use in the request for an OAuth Potency Lawmaking.

http://localhost:8080/auth/realms/appsdeveloperblog/protocol/openid-connect/auth ?client_id=photo-app-lawmaking-menses-customer &response_type=code &scope=profile &redirect_uri=http://localhost:8081/callback& state=fj8o3n7bdy1op5

Exchanging Potency Lawmaking for Admission Token

Once you have the Authorization Code, you are ready to exchange it for an access token. Below is an example of a gyre command you can use to exchange an potency code for an access token. Supersede the request parameter values with the ones relevant to your project.

Asking

whorl --location --asking Postal service 'http://localhost:8080/auth/realms/appsdeveloperblog/protocol/openid-connect/token' \ --header 'Content-Type: application/x-www-form-urlencoded' \ --data-urlencode 'grant_type=authorization_code' \ --data-urlencode 'client_id=photograph-app-code-flow-client' \ --data-urlencode 'client_secret=3424193f-4728-4d19-8517-d450d7c6f2f5' \ --information-urlencode 'code=c081f6ca-ae87-40b6-8138-5afd4162d181.f109bb89-cd34-4374-b084-c3c1cf2c8a0b.1dc15d06-d8b9-4f0f-a042-727eaa6b98f7' \ --data-urlencode 'redirect_uri=http://localhost:8081/callback'

Where:

• http://localhost:8081/callback  – is a redirect_uri which is REQUIRED, if the redirect_uri parameter was included in the authorization request to larn the Authorization Code,
• authorization_code – is a REQUIRED grant_type parameter which value must be "authorization_code".If you provide a different value here, the request will non exist successful.
• The value of a coderequest parameter must be an OAuth Authorisation Code that was received from an authority server. It is this value we are exchanging for an access token.

Response

In case of a successful request, below is an example of a response that contains an access token and a refresh token.

{     "access_token": "eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICItNUlsX2I0cUktdWFvaEI3d244UHY3WEM2UEktU3BNbmZCRnlJZUx6QTJNIn0.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.KHCNF0Rn-I7iFosB3oEaWetRw9lhSkkP0-Ef6iW2GAZuuI-GQtZUBDAD_aEDtLTdUpvGL8MKx8Os0qbUZKJJhBhTAJyz2DycgY--ROc_vLbPtJSll-F68tHT6KgC2etbTjpz4Ira6PaLigkT80zGb6tpnQmm1o7a4IGQ40-faKC4fivdfblypGqgRnniOGXMLGpzO2Ln92w1azjFAyOCIBhe3Nlcofjupi26qNGrJKuwBudzZgZCla9RDWm2MUTqMW65AOUpOmiJCd5E4JxbwOuG6H2tbYI2Z-ajQXzzcodmCAWfWu2oRkMaAuNImph8W9tRrqCQ0wlb55tXnUvEuw",     "expires_in": 300,     "refresh_expires_in": 1800,     "refresh_token": "eyJhbGciOiJIUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJlYWQyMDZmOS05MzczLTQ1OTAtOGQ4OC03YWNkYmZjYTU5MmMifQ.eyJleHAiOjE1OTIzNDU0NDEsImlhdCI6MTU5MjM0MzY0MSwianRpIjoiOGE2NTdhMDktYTQ3My00OTAyLTk1MjItYWYxMGFkMzUwYzUyIiwiaXNzIjoiaHR0cDovL2xvY2FsaG9zdDo4MDgwL2F1dGgvcmVhbG1zL2FwcHNkZXZlbG9wZXJibG9nIiwiYXVkIjoiaHR0cDovL2xvY2FsaG9zdDo4MDgwL2F1dGgvcmVhbG1zL2FwcHNkZXZlbG9wZXJibG9nIiwic3ViIjoiMWRkZTNmYzMtYzZkYi00OWZiLTliM2QtNzk2NGM1YzA2ODdhIiwidHlwIjoiUmVmcmVzaCIsImF6cCI6InBob3RvLWFwcC1jb2RlLWZsb3ctY2xpZW50Iiwic2Vzc2lvbl9zdGF0ZSI6ImYxMDliYjg5LWNkMzQtNDM3NC1iMDg0LWMzYzFjZjJjOGEwYiIsInNjb3BlIjoicHJvZmlsZSJ9.WevUHYd7DV3Ft7mFJnM2iLlArotBvLlMfQxlcy0nig8",     "token_type": "bearer",     "not-before-policy": 0,     "session_state": "f109bb89-cd34-4374-b084-c3c1cf2c8a0b",     "telescopic": "profile" }

I promise this tutorial was helpful to you lot. Have a look at other OAuth and Keycloak tutorials on this site and hopefully y'all will find other helpful ones.

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Source: https://www.appsdeveloperblog.com/keycloak-authorization-code-grant-example/

Posted by: aliviadaily7blogs.blogspot.com

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