Fixed various sonar identified code smells
[clamp.git] / src / main / java / org / onap / clamp / clds / ClampServlet.java
1 /*-
2  * ============LICENSE_START=======================================================
3  * ONAP CLAMP
4  * ================================================================================
5  * Copyright (C) 2018 AT&T Intellectual Property. All rights
6  *                             reserved.
7  * ================================================================================
8  * Modifications Copyright (c) 2019 Samsung
9  * ================================================================================
10  * Licensed under the Apache License, Version 2.0 (the "License");
11  * you may not use this file except in compliance with the License.
12  * You may obtain a copy of the License at
13  *
14  * http://www.apache.org/licenses/LICENSE-2.0
15  *
16  * Unless required by applicable law or agreed to in writing, software
17  * distributed under the License is distributed on an "AS IS" BASIS,
18  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19  * See the License for the specific language governing permissions and
20  * limitations under the License.
21  * ============LICENSE_END============================================
22  * ===================================================================
23  *
24  */
25
26 package org.onap.clamp.clds;
27
28 import com.att.eelf.configuration.EELFLogger;
29 import com.att.eelf.configuration.EELFManager;
30 import org.apache.camel.component.servlet.CamelHttpTransportServlet;
31 import org.onap.clamp.clds.service.SecureServicePermission;
32 import org.springframework.context.ApplicationContext;
33 import org.springframework.http.HttpStatus;
34 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
35 import org.springframework.security.core.Authentication;
36 import org.springframework.security.core.GrantedAuthority;
37 import org.springframework.security.core.authority.SimpleGrantedAuthority;
38 import org.springframework.security.core.context.SecurityContextHolder;
39 import org.springframework.security.core.userdetails.User;
40 import org.springframework.web.context.support.WebApplicationContextUtils;
41
42 import javax.servlet.ServletException;
43 import javax.servlet.http.HttpServletRequest;
44 import javax.servlet.http.HttpServletResponse;
45 import java.io.IOException;
46 import java.security.Principal;
47 import java.util.ArrayList;
48 import java.util.List;
49
50 public class ClampServlet extends CamelHttpTransportServlet {
51
52     /**
53      * The serial version ID.
54      */
55     private static final long serialVersionUID = -4198841134910211542L;
56
57     private static final EELFLogger logger = EELFManager.getInstance().getLogger(ClampServlet.class);
58     private static final String PERM_INSTANCE = "clamp.config.security.permission.instance";
59     private static final String PERM_CL = "clamp.config.security.permission.type.cl";
60     private static final String PERM_TEMPLATE = "clamp.config.security.permission.type.template";
61     private static final String PERM_VF = "clamp.config.security.permission.type.filter.vf";
62     private static final String PERM_MANAGE = "clamp.config.security.permission.type.cl.manage";
63     private static final String PERM_TOSCA = "clamp.config.security.permission.type.tosca";
64     private static final String AUTHENTICATION_CLASS = "clamp.config.security.authentication.class";
65     private static final String READ = "read";
66     private static final String UPDATE = "update";
67
68     private static List<SecureServicePermission> permissionList;
69
70     private synchronized Class loadDynamicAuthenticationClass() {
71         try {
72             String authenticationObject = WebApplicationContextUtils.getWebApplicationContext(getServletContext())
73                     .getEnvironment().getProperty(AUTHENTICATION_CLASS);
74             return Class.forName(authenticationObject);
75         } catch (ClassNotFoundException e) {
76             logger.error(
77                     "Exception caught when attempting to create associated class of config:" + AUTHENTICATION_CLASS, e);
78             return Object.class;
79         }
80     }
81
82     private synchronized List<SecureServicePermission> getPermissionList() {
83         if (permissionList == null) {
84             permissionList = new ArrayList<>();
85             ApplicationContext applicationContext = WebApplicationContextUtils
86                     .getWebApplicationContext(getServletContext());
87             String cldsPermissionInstance = applicationContext.getEnvironment().getProperty(PERM_INSTANCE);
88             permissionList.add(SecureServicePermission.create(applicationContext.getEnvironment().getProperty(PERM_CL),
89                     cldsPermissionInstance, READ));
90             permissionList.add(SecureServicePermission.create(applicationContext.getEnvironment().getProperty(PERM_CL),
91                     cldsPermissionInstance, UPDATE));
92             permissionList.add(SecureServicePermission.create(
93                     applicationContext.getEnvironment().getProperty(PERM_TEMPLATE), cldsPermissionInstance, READ));
94             permissionList.add(SecureServicePermission.create(
95                     applicationContext.getEnvironment().getProperty(PERM_TEMPLATE), cldsPermissionInstance, UPDATE));
96             permissionList.add(SecureServicePermission.create(applicationContext.getEnvironment().getProperty(PERM_VF),
97                     cldsPermissionInstance, "*"));
98             permissionList.add(SecureServicePermission
99                     .create(applicationContext.getEnvironment().getProperty(PERM_MANAGE), cldsPermissionInstance, "*"));
100             permissionList.add(SecureServicePermission
101                     .create(applicationContext.getEnvironment().getProperty(PERM_TOSCA), cldsPermissionInstance, READ));
102             permissionList.add(SecureServicePermission
103                     .create(applicationContext.getEnvironment().getProperty(PERM_TOSCA), cldsPermissionInstance, UPDATE));
104         }
105         return permissionList;
106     }
107
108     /**
109      * When AAF is enabled, request object will contain a cadi Wrapper, so queries
110      * to isUserInRole will invoke a http call to AAF server.
111      */
112     @Override
113     protected void doService(HttpServletRequest request, HttpServletResponse response) {
114         Principal principal = request.getUserPrincipal();
115         if (loadDynamicAuthenticationClass().isInstance(principal)) {
116             // When AAF is enabled, there is a need to provision the permissions to Spring
117             // system
118             List<GrantedAuthority> grantedAuths = new ArrayList<>();
119             for (SecureServicePermission perm : getPermissionList()) {
120                 String permString = perm.toString();
121                 if (request.isUserInRole(permString)) {
122                     grantedAuths.add(new SimpleGrantedAuthority(permString));
123                 }
124             }
125             Authentication auth = new UsernamePasswordAuthenticationToken(new User(principal.getName(), "", grantedAuths), "",
126                     grantedAuths);
127             SecurityContextHolder.getContext().setAuthentication(auth);
128         }
129         try {
130             super.doService(request, response);
131         } catch (ServletException | IOException ioe) {
132             logger.error("Exception caught when executing doService in servlet", ioe);
133             try {
134                 response.sendError(HttpStatus.INTERNAL_SERVER_ERROR.value());
135             } catch (IOException e) {
136                 logger.error("Exception caught when executing HTTP sendError in servlet", e);
137             }
138         }
139     }
140 }