content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.servlet.common.service;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasSuperType;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class ServletAndFilterInstrumentation implements TypeInstrumentation {
    private final String basePackageName;
    private final String adviceClassName;
    private final String servletInitAdviceClassName;
    private final String filterInitAdviceClassName;
  
    public ServletAndFilterInstrumentation(
        String basePackageName,
        String adviceClassName,
        String servletInitAdviceClassName,
        String filterInitAdviceClassName) {
      this.basePackageName = basePackageName;
      this.adviceClassName = adviceClassName;
      this.servletInitAdviceClassName = servletInitAdviceClassName;
      this.filterInitAdviceClassName = filterInitAdviceClassName;
    }
  
    public ServletAndFilterInstrumentation(String basePackageName, String adviceClassName) {
      this(basePackageName, adviceClassName, null, null);
    }
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed(basePackageName + ".Servlet");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return hasSuperType(namedOneOf(basePackageName + ".Filter", basePackageName + ".Servlet"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          namedOneOf("doFilter", "service")
              .and(takesArgument(0, named(basePackageName + ".ServletRequest")))
              .and(takesArgument(1, named(basePackageName + ".ServletResponse")))
              .and(isPublic()),
          adviceClassName);
      if (servletInitAdviceClassName != null) {
        transformer.applyAdviceToMethod(
            named("init").and(takesArgument(0, named(basePackageName + ".ServletConfig"))),
            servletInitAdviceClassName);
      }
      if (filterInitAdviceClassName != null) {
        transformer.applyAdviceToMethod(
            named("init").and(takesArgument(0, named(basePackageName + ".FilterConfig"))),
            filterInitAdviceClassName);
      }
    }
  }
  