Spring security real combat dry goods: the entrance of client oauth2 authorization request

Little fat brother manong 2020-11-10 09:12:40
spring security real combat dry

1. Preface

stay Spring Security Combat dry goods :OAuth2 Third party authorization initial experience I am right in the article first OAuth2.0 Some common concepts involved are introduced , And then go straight through one DEMO To make you feel it OAuth2.0 Third party authorization function . Today, let's analyze the mechanism step by step .

2. Catch the source


The above request URL Are we in Last one The starting point of the third-party authentication operation mentioned in the article , The default format is {baseUrl}/oauth2/authorization/{clientRegistrationId}, among clientRegistrationId Represents a third party logo , It can be wechat 、 Alipay and other open platforms , Here for gitee. The user clicks on the request and begins the journey of authorization . If everyone is Xiaobai from scratch , It must be from this entrance to explore the mechanism step by step .Spring Security It must have been intercepted /oauth2/authorization It was only then enabled OAuth2 Related processing logic . Then grab the source ! Search from source code !IDEA Shortcut key CTRL SHIFT R You can search the results globally .

IDEA The search results

As expected, three places were found , Write down one by one to see !


Let's take a look at the first one OAuth2AuthorizationRequestRedirectWebFilter, It has achieved Spring Webflux Of WebFilter Interface , This is obviously Webflux Things that are , If you use Webflux This will work , But not now .


What is the second one , From the name it looks like a default OAuth2 Authorization request parser . Sometimes a good name can tell what this thing is about , It has to be said that excellent framework details are well grasped . It implements the interface OAuth2AuthorizationRequestResolver:

public interface OAuth2AuthorizationRequestResolver {
* from HttpServletRequest Parse encapsulation in object OAuth2AuthorizationRequest
OAuth2AuthorizationRequest resolve(HttpServletRequest request);
* from HttpServletRequest Objects and clientRegistrationId Parse package in OAuth2AuthorizationRequest
OAuth2AuthorizationRequest resolve(HttpServletRequest request, String clientRegistrationId);

That is, when we ask /oauth2/authorization when ,DefaultOAuth2AuthorizationRequestResolver From /oauth2/authorization Corresponding HttpServletRequest Extract data from the package to OAuth2AuthorizationRequest Further use in the request object .

Be careful /oauth2/authorization This default blocking ID can also be customized .


Let's just mention it here OAuth2AuthorizationRequest Encapsulates some of the things we described in the last article OAuth2 Relevant concept parameters , We will use this request class later .

public final class OAuth2AuthorizationRequest implements Serializable {
private static final long serialVersionUID = 520L;
private String authorizationUri;
private AuthorizationGrantType authorizationGrantType;
private OAuth2AuthorizationResponseType responseType;
private String clientId;
private String redirectUri;
private Set<String> scopes;
private String state;
private Map<String, Object> additionalParameters;
private String authorizationRequestUri;
private Map<String, Object> attributes;
// Other methods are a little bit


And that's the clue left , As soon as I see it inherits OncePerRequestFilter I knew it must be him . Even its member variables contain a way to parse OAuth2 Requested OAuth2AuthorizationRequestResolver. We're on the right track here , Start analyzing this filter , Here's the core filtering logic , That's what we want to know OAuth2 The logic of how authorization requests are intercepted .

protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
try {
OAuth2AuthorizationRequest authorizationRequest = this.authorizationRequestResolver.resolve(request);
if (authorizationRequest != null) {
this.sendRedirectForAuthorization(request, response, authorizationRequest);
} catch (Exception failed) {
this.unsuccessfulRedirectForAuthorization(request, response, failed);
try {
filterChain.doFilter(request, response);
} catch (IOException ex) {
throw ex;
} catch (Exception ex) {
// Check to see if we need to handle ClientAuthorizationRequiredException
Throwable[] causeChain = this.throwableAnalyzer.determineCauseChain(ex);
ClientAuthorizationRequiredException authzEx = (ClientAuthorizationRequiredException) this.throwableAnalyzer
.getFirstThrowableOfType(ClientAuthorizationRequiredException.class, causeChain);
if (authzEx != null) {
try {
OAuth2AuthorizationRequest authorizationRequest = this.authorizationRequestResolver.resolve(request, authzEx.getClientRegistrationId());
if (authorizationRequest == null) {
throw authzEx;
this.sendRedirectForAuthorization(request, response, authorizationRequest);
this.requestCache.saveRequest(request, response);
} catch (Exception failed) {
this.unsuccessfulRedirectForAuthorization(request, response, failed);
if (ex instanceof ServletException) {
throw (ServletException) ex;
} else if (ex instanceof RuntimeException) {
throw (RuntimeException) ex;
} else {
throw new RuntimeException(ex);

doFilterInternal The corresponding process is as follows :

OAuth2AuthorizationRequestRedirectFilter Execute the process

According to this process , If you want to make it clear Spring Security OAuth2 How to redirect to a third party requires in-depth study sendRedirectForAuthorization Method , Based on the space, I will analyze it in the next article .

3. summary

Today we find out from the source step by step OAuth2 Authorized processing entry , The function of several key components and the interception logic of the core interceptor are analyzed . In the future, we will make clear the operation process step by step , Don't go away , lock : Small fat man of minong Learn step by step Spring Security OAuth2 .

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