A question about resource path processing

[superDao]

Describe the bug
webjars subdirectory resource 404 found after using springdoc

To Reproduce

spring-boot 3.1.2

springdoc-openapi-starter-webflux-ui 2.2.0

http://localhost:8087/webjars/swagger-ui/swagger-ui.css It is ok

springdoc The request path was changed to match the version number

org.springdoc.webflux.ui.SwaggerResourceResolver::resolveResource -> org.springdoc.ui.AbstractSwaggerResourceResolver::findWebJarResourcePath

swagger-ui/index.html -> swagger-ui\5.2.0\index.html

<img width="817" alt="微信截图_20230817134218" src="">

Other Jar resources
http://localhost:8087/webjars/aa/bb.html 404

aa/bb.html -> aa/5.2.0/bb.html

It is recommended that the path starting with swagger-ui be processed

[rainzhou2012]

From v2.1.0, webjars-locator-core was removed, WebJarsResourceResolver insteads by SwaggerResourceResolver. Looks like SwaggerResourceResolver isn't implemented right.

	@Override
	public Mono<Resource> resolveResource(ServerWebExchange exchange, String requestPath, List<? extends Resource> locations, ResourceResolverChain chain) {
		Mono<Resource> resolved = chain.resolveResource(exchange, requestPath, locations);
		if (!Mono.empty().equals(resolved)) {
			String webJarResourcePath = findWebJarResourcePath(requestPath);
			if (webJarResourcePath != null)
				return chain.resolveResource(exchange, webJarResourcePath, locations);
		}
		return resolved;
	}

it's wrong to compare resolved and mono.empty by equals, should same as WebJarsResourceResolver.

	@Override
	protected Mono<Resource> resolveResourceInternal(@Nullable ServerWebExchange exchange,
			String requestPath, List<? extends Resource> locations, ResourceResolverChain chain) {

		return chain.resolveResource(exchange, requestPath, locations)
				.switchIfEmpty(Mono.defer(() -> {
					String webJarsResourcePath = findWebJarResourcePath(requestPath);
					if (webJarsResourcePath != null) {
						return chain.resolveResource(exchange, webJarsResourcePath, locations);
					}
					else {
						return Mono.empty();
					}
				}));
	}

[bnasslahsen]

@superDao,

Good finding!