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122 lines
3.5 KiB
Plaintext
122 lines
3.5 KiB
Plaintext
= OAuth 2.0 Resource Server Bearer Tokens
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[[webflux-oauth2resourceserver-bearertoken-resolver]]
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== Bearer Token Resolution
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By default, Resource Server looks for a bearer token in the `Authorization` header.
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However, you can verify this token.
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For example, you may have a need to read the bearer token from a custom header.
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To do so, you can wire an instance of `ServerBearerTokenAuthenticationConverter` into the DSL:
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.Custom Bearer Token Header
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====
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.Java
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[source,java,role="primary"]
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----
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ServerBearerTokenAuthenticationConverter converter = new ServerBearerTokenAuthenticationConverter();
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converter.setBearerTokenHeaderName(HttpHeaders.PROXY_AUTHORIZATION);
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http
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.oauth2ResourceServer(oauth2 -> oauth2
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.bearerTokenConverter(converter)
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);
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----
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.Kotlin
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[source,kotlin,role="secondary"]
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----
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val converter = ServerBearerTokenAuthenticationConverter()
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converter.setBearerTokenHeaderName(HttpHeaders.PROXY_AUTHORIZATION)
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return http {
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oauth2ResourceServer {
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bearerTokenConverter = converter
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}
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}
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----
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====
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== Bearer Token Propagation
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Now that you have a bearer token, you can pass that to downstream services.
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This is possible with `{security-api-url}org/springframework/security/oauth2/server/resource/web/reactive/function/client/ServerBearerExchangeFilterFunction.html[ServerBearerExchangeFilterFunction]`:
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====
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.Java
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[source,java,role="primary"]
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----
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@Bean
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public WebClient rest() {
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return WebClient.builder()
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.filter(new ServerBearerExchangeFilterFunction())
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.build();
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}
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----
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.Kotlin
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[source,kotlin,role="secondary"]
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----
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@Bean
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fun rest(): WebClient {
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return WebClient.builder()
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.filter(ServerBearerExchangeFilterFunction())
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.build()
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}
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----
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====
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When the `WebClient` shown in the preceding example performs requests, Spring Security looks up the current `Authentication` and extract any `{security-api-url}org/springframework/security/oauth2/core/AbstractOAuth2Token.html[AbstractOAuth2Token]` credential.
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Then, it propagates that token in the `Authorization` header -- for example:
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====
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.Java
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[source,java,role="primary"]
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----
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this.rest.get()
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.uri("https://other-service.example.com/endpoint")
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.retrieve()
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.bodyToMono(String.class)
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----
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.Kotlin
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[source,kotlin,role="secondary"]
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----
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this.rest.get()
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.uri("https://other-service.example.com/endpoint")
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.retrieve()
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.bodyToMono<String>()
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----
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====
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The prececing example invokes the `https://other-service.example.com/endpoint`, adding the bearer token `Authorization` header for you.
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In places where you need to override this behavior, you can supply the header yourself:
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====
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.Java
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[source,java,role="primary"]
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----
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this.rest.get()
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.uri("https://other-service.example.com/endpoint")
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.headers(headers -> headers.setBearerAuth(overridingToken))
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.retrieve()
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.bodyToMono(String.class)
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----
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.Kotlin
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[source,kotlin,role="secondary"]
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----
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rest.get()
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.uri("https://other-service.example.com/endpoint")
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.headers { it.setBearerAuth(overridingToken) }
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.retrieve()
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.bodyToMono<String>()
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----
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====
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In this case, the filter falls back and forwards the request onto the rest of the web filter chain.
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[NOTE]
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====
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Unlike the https://docs.spring.io/spring-security/site/docs/current-SNAPSHOT/api/org/springframework/security/oauth2/client/web/reactive/function/client/ServerOAuth2AuthorizedClientExchangeFilterFunction.html[OAuth 2.0 Client filter function], this filter function makes no attempt to renew the token, should it be expired.
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====
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