1 files changed, 71 insertions, 0 deletions
diff --git a/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/server/resolvers/UserIdResolver.java b/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/server/resolvers/UserIdResolver.java
new file mode 100644
index 00000000..80cb07a8
--- /dev/null
+++ b/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/server/resolvers/UserIdResolver.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright © 2018 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.sdc.workflow.server.resolvers;
+
+import static org.onap.sdc.workflow.api.RestParams.USER_ID_HEADER;
+
+import java.util.Objects;
+import javax.servlet.http.HttpServletRequest;
+import org.onap.sdc.workflow.services.annotations.UserId;
+import org.springframework.core.MethodParameter;
+import org.springframework.web.bind.ServletRequestBindingException;
+import org.springframework.web.bind.support.WebDataBinderFactory;
+import org.springframework.web.context.request.NativeWebRequest;
+import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.web.method.support.ModelAndViewContainer;
+
+/**
+ * Resolves a user ID from an HTTP header and injects it into a parameter of type {@link String} annotated with {@link
+ * UserId}. The header is considered mandatory, therefore an error is returned to the client if no user ID was sent.
+ *
+ * @author evitaliy
+ * @since 21 Aug 2018
+ */
+public class UserIdResolver implements HandlerMethodArgumentResolver {
+
+    private static final String ERROR_MESSAGE = "Missing mandatory request header '" + USER_ID_HEADER + "'";
+
+    @Override
+    public boolean supportsParameter(MethodParameter methodParameter) {
+
+        if (!methodParameter.hasParameterAnnotation(UserId.class)) {
+            return false;
+        }
+
+        Class<?> parameterType = methodParameter.getParameterType();
+        if (!parameterType.equals(String.class)) {
+            throw new IllegalStateException("Cannot inject user ID into a parameter of type "
+                                                    + parameterType.getTypeName());
+        }
+
+        return true;
+    }
+
+    @Override
+    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer,
+            NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory)
+            throws ServletRequestBindingException {
+
+        HttpServletRequest httpServletRequest = nativeWebRequest.getNativeRequest(HttpServletRequest.class);
+        String userHeader = Objects.requireNonNull(httpServletRequest).getHeader(USER_ID_HEADER);
+        if (userHeader == null) {
+            throw new ServletRequestBindingException(ERROR_MESSAGE);
+        }
+
+        return userHeader;
+    }
+}
+\ No newline at end of file