full/src/main/java/de/ids_mannheim/korap/web/controller/AuthenticationController.java

package de.ids_mannheim.korap.web.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.SecurityContext;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.glassfish.jersey.server.ContainerRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import de.ids_mannheim.korap.authentication.AuthenticationManager;
import de.ids_mannheim.korap.authentication.http.AuthorizationData;
import de.ids_mannheim.korap.authentication.http.HttpAuthorizationHandler;
import de.ids_mannheim.korap.config.Attributes;
import de.ids_mannheim.korap.config.BeansFactory;
import de.ids_mannheim.korap.constant.AuthenticationMethod;
import de.ids_mannheim.korap.constant.AuthenticationScheme;
import de.ids_mannheim.korap.constant.TokenType;
import de.ids_mannheim.korap.exceptions.KustvaktException;
import de.ids_mannheim.korap.exceptions.StatusCodes;
import de.ids_mannheim.korap.security.context.TokenContext;
import de.ids_mannheim.korap.user.User;
import de.ids_mannheim.korap.utils.JsonUtils;
import de.ids_mannheim.korap.utils.ServiceInfo;
import de.ids_mannheim.korap.web.KustvaktResponseHandler;
import de.ids_mannheim.korap.web.filter.APIVersionFilter;
import de.ids_mannheim.korap.web.filter.AuthenticationFilter;
import de.ids_mannheim.korap.web.filter.BlockingFilter;
import de.ids_mannheim.korap.web.filter.DemoUserFilter;
import de.ids_mannheim.korap.web.filter.PiwikFilter;
import de.ids_mannheim.korap.web.utils.ResourceFilters;

// import com.sun.xml.internal.messaging.saaj.util.Base64;

/**
 * @author hanl
 * @date 24/01/2014
 * 
 * @author margaretha
 * @last-update 01/07/2019
 * 
 * - added user authentication time in token context
 * - added api version filter
 * - changed the response media-type 
 */
@Controller
@Path("/{version}/auth")
@ResourceFilters({APIVersionFilter.class, PiwikFilter.class })
@Produces(MediaType.APPLICATION_JSON + ";charset=utf-8")
public class AuthenticationController {

    @Autowired
    private KustvaktResponseHandler kustvaktResponseHandler;
    
    @Autowired
    private HttpAuthorizationHandler authorizationHandler;

    private static Boolean DEBUG_LOG = true;

    //todo: bootstrap function to transmit certain default configuration settings and examples (example user queries,
    // default usersettings, etc.)
    private static Logger jlog =
            LogManager.getLogger(AuthenticationController.class);

    @Autowired
    private AuthenticationManager controller;

    //    private SendMail mail;

    /**
     * represents json string with data. All GUI clients can access
     * this method to get certain default values
     * --> security checks?
     * 
     * @return String
     */
    @Deprecated
    @GET
    @Path("bootstrap")
    @Produces(MediaType.APPLICATION_JSON)
    public Response bootstrap () {
        Map m = new HashMap();
        //        m.put("settings", new UserSettings().toObjectMap());
        m.put("ql", BeansFactory.getKustvaktContext().getConfiguration()
                .getQueryLanguages());
        m.put("SortTypes", null); // types of sorting that are supported!
        m.put("version", ServiceInfo.getInfo().getVersion());
        try {
            return Response.ok(JsonUtils.toJSON(m)).build();
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }
    }


    // fixme: moved to user
    @GET
    @Path("status")
    @ResourceFilters({ AuthenticationFilter.class, DemoUserFilter.class,
            BlockingFilter.class })
    public Response getStatus (@Context SecurityContext context,
            @HeaderParam(ContainerRequest.USER_AGENT) String agent,
            @HeaderParam(ContainerRequest.HOST) String host,
            @Context Locale locale) {
        TokenContext ctx = (TokenContext) context.getUserPrincipal();
        try {
            return Response.ok(ctx.toJson()).build();
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }
    }
    
    // EM: testing using spring security authentication manager
//    @Deprecated
//    @GET
//    @Path("ldap/token")
//    public Response requestToken (@Context HttpHeaders headers,
//            @Context Locale locale,
//            @HeaderParam(ContainerRequest.USER_AGENT) String agent,
//            @HeaderParam(ContainerRequest.HOST) String host,
//            @HeaderParam("referer-url") String referer,
//            @QueryParam("scope") String scopes,
//            //   @Context WebServiceContext wsContext, // FB
//            @Context SecurityContext securityContext) {
//        
//        Map<String, Object> attr = new HashMap<>();
//        if (scopes != null && !scopes.isEmpty())
//            attr.put(Attributes.SCOPES, scopes);
//        attr.put(Attributes.HOST, host);
//        attr.put(Attributes.USER_AGENT, agent);
//        
//        User user = new KorAPUser();
//        user.setUsername(securityContext.getUserPrincipal().getName());
//        controller.setAccessAndLocation(user, headers);
//        if (DEBUG_LOG == true) System.out.printf(
//                "Debug: /token/: location=%s, access='%s'.\n",
//                user.locationtoString(), user.accesstoString());
//        attr.put(Attributes.LOCATION, user.getLocation());
//        attr.put(Attributes.CORPUS_ACCESS, user.getCorpusAccess());
//        
//        try {
//            TokenContext context = controller.createTokenContext(user, attr,
//                    TokenType.API);
//            return Response.ok(context.toJson()).build();
//        }
//        catch (KustvaktException e) {
//            throw kustvaktResponseHandler.throwit(e);
//        }
//    }


    @Deprecated
    @GET
    @Path("apiToken")
    //@ResourceFilters({HeaderFilter.class})
    public Response requestAPIToken (@Context HttpHeaders headers,
            @Context Locale locale,
            @HeaderParam(ContainerRequest.USER_AGENT) String agent,
            @HeaderParam(ContainerRequest.HOST) String host,
            @HeaderParam("referer-url") String referer,
            @QueryParam("scope") String scopes,
            //   @Context WebServiceContext wsContext, // FB
            @Context SecurityContext secCtx) {
        
        if (DEBUG_LOG == true) {
            String warning = "Access to API token (JWT) web service";
            
            List<String> auth =
                  headers.getRequestHeader(ContainerRequest.AUTHORIZATION);
          if (auth != null && !auth.isEmpty()) {
              try {
                  AuthorizationData authorizationData = authorizationHandler
                          .parseAuthorizationHeaderValue(auth.get(0));
                  if (authorizationData.getAuthenticationScheme()
                          .equals(AuthenticationScheme.BASIC)) {
                      authorizationData = authorizationHandler
                              .parseBasicToken(authorizationData);
                      jlog.warn(warning + " with username:"+authorizationData.getUsername());
                  }
              }
              catch (KustvaktException e) {}
          }
          else {
              jlog.warn(warning);
          }
        }
        throw kustvaktResponseHandler.throwit(new KustvaktException(
                StatusCodes.DEPRECATED,
                "API token is no longer supported. Please use OAuth2 procedure instead."));
    }

//        List<String> auth =
//                headers.getRequestHeader(ContainerRequest.AUTHORIZATION);
//        if (auth == null || auth.isEmpty()) {
//            throw kustvaktResponseHandler
//                    .throwit(new KustvaktException(StatusCodes.MISSING_PARAMETER,
//                            "Authorization header is missing.",
//                            "Authorization header"));
//        }
//        
//        AuthorizationData authorizationData;
//        try {
//            authorizationData = authorizationHandler.
//                    parseAuthorizationHeaderValue(auth.get(0));
//            if (authorizationData.getAuthenticationScheme().equals(AuthenticationScheme.BASIC)){
//                authorizationData = authorizationHandler.parseBasicToken(authorizationData);
//            }
//            else {
//                // EM: throw exception that auth scheme is not supported?
//            }
//           
//        }
//        catch (KustvaktException e) {
//            throw kustvaktResponseHandler.throwit(e);
//        }
//
//        if (DEBUG_LOG == true) {
//            System.out.printf("Debug: AuthService.requestAPIToken...:\n");
//            System.out.printf("Debug: auth.size=%d\n", auth.size());
//            System.out.printf("auth.get(0)='%s'\n", auth.get(0));
//            /* hide password etc. - FB
//             if( auth.size() > 0 )
//            	{
//            	Iterator it = auth.iterator();
//            	while( it.hasNext() )
//            		System.out.printf(" header '%s'\n",  it.next());
//            	}
//            if( values.length > 0 )
//            	{
//            	for(int i=0; i< values.length; i++)
//            		{
//            		System.out.printf(" values[%d]='%s'\n",  i, values[i]);
//            		}
//            	}
//             */
//            MultivaluedMap<String, String> headerMap =
//                    headers.getRequestHeaders();
//            if (headerMap != null && headerMap.size() > 0) {
//                Iterator<String> it = headerMap.keySet().iterator();
//                while (it.hasNext()) {
//                    String key = (String) it.next();
//                    List<String> vals = headerMap.get(key);
////                    System.out.printf("Debug: requestAPIToken: '%s' = '%s'\n",
////                            key, vals);
//                }
//
//            }
////            System.out.printf("Debug: requestAPIToken: isSecure = %s.\n",
////                    secCtx.isSecure() ? "yes" : "no");
//        } // DEBUG_LOG        
//
//        if (authorizationData.getUsername() == null || 
//                authorizationData.getUsername().isEmpty() || 
//                authorizationData.getPassword()== null || 
//                authorizationData.getPassword().isEmpty())
//            // is actual an invalid request
//            throw kustvaktResponseHandler.throwit(StatusCodes.REQUEST_INVALID);
//
//        Map<String, Object> attr = new HashMap<>();
//        if (scopes != null && !scopes.isEmpty())
//            attr.put(Attributes.SCOPE, scopes);
//        attr.put(Attributes.HOST, host);
//        attr.put(Attributes.USER_AGENT, agent);
//
//        TokenContext context;
//        try {
//            // User user = controller.authenticate(0, values[0], values[1], attr); Implementation by Hanl
//            User user = controller.authenticate(AuthenticationMethod.LDAP,
//                    authorizationData.getUsername(), authorizationData.getPassword(), attr); // Implementation with IdM/LDAP
//            // Userdata data = this.controller.getUserData(user, UserDetails.class); // Implem. by Hanl
//            // todo: is this necessary?
//            //            attr.putAll(data.fields());
//            
//            // EM: add authentication time
//            Date authenticationTime = TimeUtils.getNow().toDate();
//            attr.put(Attributes.AUTHENTICATION_TIME, authenticationTime);
//            // -- EM
//            
//            controller.setAccessAndLocation(user, headers);
//            if (DEBUG_LOG == true) System.out.printf(
//                    "Debug: /apiToken/: location=%s, access='%s'.\n",
//                    user.locationtoString(), user.accesstoString());
//            attr.put(Attributes.LOCATION, user.getLocation());
//            attr.put(Attributes.CORPUS_ACCESS, user.getCorpusAccess());
//            context = controller.createTokenContext(user, attr,
//                  TokenType.API);
////            context = controller.createTokenContext(user, attr,
////                    Attributes.API_AUTHENTICATION);
//        }
//        catch (KustvaktException e) {
//            throw kustvaktResponseHandler.throwit(e);
//        }
//
//        try {
//            return Response.ok(context.toJson()).build();
//        }
//        catch (KustvaktException e) {
//            throw kustvaktResponseHandler.throwit(e);
//        }
//    }


    // todo:
    @Deprecated
    @GET
    @Path("refresh")
    public Response refresh (@Context SecurityContext context,
            @Context Locale locale) {
        TokenContext ctx = (TokenContext) context.getUserPrincipal();
        TokenContext newContext;

        //        try {
        //            newContext = controller.refresh(ctx);
        //        }catch (KorAPException e) {
        //            KorAPLogger.ERROR_LOGGER.error("Exception encountered!", e);
        //            throw KustvaktResponseHandler.throwit(e);
        //        }
        //        return Response.ok().entity(newContext.getToken()).build();
        return null;
    }


    @GET
    @Path("sessionToken")
    //@ResourceFilters({HeaderFilter.class})
    public Response requestSession (@Context HttpHeaders headers,
            @Context Locale locale,
            @HeaderParam(ContainerRequest.USER_AGENT) String agent,
            @HeaderParam(ContainerRequest.HOST) String host) {
        List<String> auth =
                headers.getRequestHeader(ContainerRequest.AUTHORIZATION);

        AuthorizationData authorizationData;
        try {
            authorizationData = authorizationHandler.
                    parseAuthorizationHeaderValue(auth.get(0));
            authorizationData = authorizationHandler.parseBasicToken(authorizationData);
           
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }

        // Implementation Hanl mit '|'. 16.02.17/FB
        //if (values[0].equalsIgnoreCase("null")
        //        | values[1].equalsIgnoreCase("null"))
        if (authorizationData.getUsername() == null || 
                authorizationData.getUsername().isEmpty() || 
                authorizationData.getPassword()== null || 
                authorizationData.getPassword().isEmpty())
            // is actual an invalid request
            throw kustvaktResponseHandler.throwit(StatusCodes.REQUEST_INVALID);

        Map<String, Object> attr = new HashMap<>();
        attr.put(Attributes.HOST, host);
        attr.put(Attributes.USER_AGENT, agent);
        TokenContext context;
        String contextJson;
        try {
            //EM: authentication scheme default
            User user = controller.authenticate(AuthenticationMethod.DATABASE,
                    authorizationData.getUsername(), authorizationData.getPassword(), attr);
            context = controller.createTokenContext(user, attr,
                    TokenType.SESSION);
//            context = controller.createTokenContext(user, attr,
//                    Attributes.SESSION_AUTHENTICATION);
            contextJson = context.toJson();
            jlog.debug(contextJson);
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }
        return Response.ok().entity(contextJson).build();
    }


    // fixme: security issues: setup shibboleth compatible authentication system
    // todo: will be purged with token authentication --> shib is client side
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces("application/json")
    @Path("shibboleth")
    public Response loginshib (@Context HttpHeaders headers,
            @Context Locale locale,
            @HeaderParam(ContainerRequest.USER_AGENT) String agent,
            @HeaderParam(ContainerRequest.HOST) String host,
            @QueryParam("client_id") String client_id) {

        // the shibfilter decrypted the values
        // define default provider for returned access token strategy?!

        Map<String, Object> attr = new HashMap<>();
        attr.put(Attributes.HOST, host);
        attr.put(Attributes.USER_AGENT, agent);

        TokenContext context;

        try {
            // todo: distinguish type KorAP/Shibusers
            User user = controller.authenticate(AuthenticationMethod.SHIBBOLETH,
                    null, null, attr);
            context = controller.createTokenContext(user, attr, null);
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }
        try {
            return Response.ok().entity(context.toJson()).build();
        }
        catch (KustvaktException e) {
            throw kustvaktResponseHandler.throwit(e);
        }
    }

}