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Official Spring security oauth project provides a comprehensive example for implementing OAuth2. Rest Template; import com.websystique.springmvc.model. Auth Token Info; import com.websystique.springmvc.model. User; public class Spring Rest Client Auth Token Info [access_token=fceed386-5923-4bf8-b193-1d76f95da4c4, token_type=bearer, refresh_token=29d28ee2-9d09-483f-a2d6-7f93e7a31667, expires_in=71, scope=read write trust] Testing list All Users API----------- User : id=1, Name=Sam, Age=30, Salary=70000.0 User : id=2, Name=Tom, Age=40, Salary=50000.0 User : id=3, Name=Jerome, Age=45, Salary=30000.0 User : id=4, Name=Silvia, Age=50, Salary=40000.0 Testing get User API---------- User [id=1, name=Sam, age=30, salary=70000.0] Testing create User API---------- Location : Security OAuth2Example/user/5 Testing list All Users API----------- User : id=1, Name=Sam, Age=30, Salary=70000.0 User : id=2, Name=Tom, Age=40, Salary=50000.0 User : id=3, Name=Jerome, Age=45, Salary=30000.0 User : id=4, Name=Silvia, Age=50, Salary=40000.0 User : id=5, Name=Sarah, Age=51, Salary=134.0 Testing update User API---------- User [id=1, name=Tomy, age=33, salary=70000.0] Testing list All Users API----------- User : id=1, Name=Tomy, Age=33, Salary=70000.0 User : id=2, Name=Tom, Age=40, Salary=50000.0 User : id=3, Name=Jerome, Age=45, Salary=30000.0 User : id=4, Name=Silvia, Age=50, Salary=40000.0 User : id=5, Name=Sarah, Age=51, Salary=134.0 Testing delete User API---------- Testing list All Users API----------- User : id=1, Name=Tomy, Age=33, Salary=70000.0 User : id=2, Name=Tom, Age=40, Salary=50000.0 User : id=4, Name=Silvia, Age=50, Salary=40000.0 User : id=5, Name=Sarah, Age=51, Salary=134.0 Testing all delete Users API---------- Testing list All Users API----------- No user exist---------- If you like tutorials on this site, why not take a step further and connect me on Facebook , Google Plus & Twitter as well?

The code samples of this post is inspired by that examples itself. I would love to hear your thoughts on these articles, it will help me improve further our learning process.

Only the usage where a client [Postman or Rest Template based Java client e.g.] have the Resource owner’s credentials and they provide those credential [along with client credentials] to authorization server in order to eventually receive the access-token[and optionally refresh token], and then use that token to actually access the resources. It also shows that ‘Password Credentials Grant’ is best suited when both the client and the servers are from same company as the trust is there, you don’t want to provide your credentials to a third party. Uri Components Builder; import com.websystique.springmvc.model. Click on update request, verify the header in header-tab.

Tokens are implementation specific random strings, generated by the authorization server and are issued when the client requests them. Send the Post request, you should receive the response containing . Now you can use this access-token [valid for 2 minutes] to access resources. After that, you should see your refresh request getting failed.

The intention of this post is to just use bare-minimum functionality required in order to secure our REST API, nothing more. If you appreciate the effort I have put in this learning site, help me improve the visibility of this site towards global audience by sharing and linking this site from within and beyond your network.

At minimum, you should be aware of four key concepts in OAuth2: OAuth2 defines four roles: In our example, our REST API can only be accessed via Resource server which will require an access token to be present with request An authorization grant is a credential representing the resource owner’s authorization (to access its protected resources) used by the client to obtain an access token. You & your friends can always link my site from your site on and share the learning.

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I found OAuth2 specification rather simple to follow.

Configuration; import org.springframework.security.config.builders. Http Security; import org.springframework.security.oauth2.config.configuration. Enable Resource Server; import org.springframework.security.oauth2.config.configuration. Resource Server Configurer Adapter; import org.springframework.security.oauth2.config.configurers. Resource Server Security Configurer; import org.springframework.security.oauth2.provider.error. OAuth2Access Denied Handler; @Configuration @Enable Resource Server public class Resource Server Configuration extends Resource Server Configurer Adapter Authorization server is the one responsible for verifying credentials and if credentials are OK, providing the tokens[refresh-token as well as access-token]. package com.websystique.springmvc.security; import org.springframework.beans.factory.annotation. Autowired; import org.springframework.beans.factory.annotation. Qualifier; import org.springframework.context.annotation. Configuration; import org.springframework.security.authentication. Authentication Manager; import org.springframework.security.oauth2.config.annotation.configurers. Client Details Service Configurer; import org.springframework.security.oauth2.config.configuration. Authorization Server Configurer Adapter; import org.springframework.security.oauth2.config.configuration. Enable Authorization Server; import org.springframework.security.oauth2.config.configurers. Authorization Server Endpoints Configurer; import org.springframework.security.oauth2.config.configurers. Authorization Server Security Configurer; import org.springframework.security.oauth2.provider.approval. User Approval Handler; import org.springframework.security.oauth2.provider.token. Token Store; @Configuration @Enable Authorization Server public class Authorization Server Configuration extends Authorization Server Configurer Adapter package com.websystique.springmvc.security; import org.springframework.beans.factory.annotation.

It also contains information about registered clients and possible access scopes and grant types. Autowired; import org.springframework.context.annotation. Bean; import org.springframework.context.annotation. Configuration; import org.springframework.security.authentication. Authentication Manager; import org.springframework.security.config.annotation.authentication.builders. Authentication Manager Builder; import org.springframework.security.config.builders. Http Security; import org.springframework.security.config.configuration. Enable Web Security; import org.springframework.security.config.configuration. Web Security Configurer Adapter; import org.springframework.security.oauth2.provider. Client Details Service; import org.springframework.security.oauth2.provider.approval. Approval Store; import org.springframework.security.oauth2.provider.approval. Token Approval Store; import org.springframework.security.oauth2.provider.approval. Token Store User Approval Handler; import org.springframework.security.oauth2.provider.request.

Resource Server hosts the resources [our REST API] the client is interested in. The access-token we got in response is then used with each request.

Resources are located on package com.websystique.springmvc.security; import org.springframework.context.annotation. If required, You can implement the refresh-token flow easily in below example.

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