fix StringIndexOutOfBoundsException when path is same webjar. springd…

…oc#2235

springdoc-openapi-common/src/main/java/org/springdoc/ui/AbstractSwaggerResourceResolver.java

@@ -36,7 +36,7 @@ public AbstractSwaggerResourceResolver(SwaggerUiConfigProperties swaggerUiConfig
 	@Nullable
 	protected String findWebJarResourcePath(String path) {
 		String webjar = webjar(path);
-		if (webjar.length() > 0) {
+		if (webjar.length() > 0 && !path.equals(webjar)) {
 			String version = swaggerUiConfigProperties.getVersion();
 			if (version != null) {
 				String partialPath = path(webjar, path);
@@ -72,4 +72,4 @@ private String path(String webjar, String path) {
 		}
 		return path;
 	}
-}
+}

springdoc-openapi-common/src/test/java/org/springdoc/ui/AbstractSwaggerResourceResolverTest.java

@@ -0,0 +1,49 @@
+package org.springdoc.ui;
+
+import java.util.Objects;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springdoc.core.SwaggerUiConfigProperties;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class AbstractSwaggerResourceResolverTest {
+	private SwaggerUiConfigProperties swaggerUiConfigProperties;
+
+	private AbstractSwaggerResourceResolver abstractSwaggerResourceResolver;
+
+	private final String VERSION = "4.18.2";
+
+	@BeforeEach
+	public void setup(){
+		swaggerUiConfigProperties = new SwaggerUiConfigProperties();
+		swaggerUiConfigProperties.setVersion(VERSION);
+		abstractSwaggerResourceResolver = new AbstractSwaggerResourceResolver(swaggerUiConfigProperties);
+	}
+
+	@Test
+	void findWebJarResourcePath() {
+		String path = "swagger-ui/swagger-initializer.js";
+
+		String actual = abstractSwaggerResourceResolver.findWebJarResourcePath(path);
+		assertEquals("swagger-ui/4.18.2/swagger-initializer.js", actual);
+	}
+
+	@Test
+	void returNullWhenPathIsSameAsWebjar() {
+		String path = "swagger-ui";
+
+		String actual = abstractSwaggerResourceResolver.findWebJarResourcePath(path);
+		assertTrue(Objects.isNull(actual));
+	}
+
+	@Test
+	void returNullWhenVersionIsNull() {
+		String path = "swagger-ui/swagger-initializer.js";
+		swaggerUiConfigProperties.setVersion(null);
+
+		String actual = abstractSwaggerResourceResolver.findWebJarResourcePath(path);
+		assertTrue(Objects.isNull(actual));
+	}
+}