Merge remote-tracking branch 'origin/dev-lms-open-olat' into dev-1.2

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsAPITemplate.java

@@ -10,19 +10,28 @@ package ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;
 import org.joda.time.DateTime;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.cache.CacheManager;
+import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.core.env.Environment;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.ResponseEntity;
 import org.springframework.http.client.ClientHttpRequestFactory;
-import org.springframework.security.oauth2.client.OAuth2RestTemplate;
 import org.springframework.security.oauth2.client.token.grant.client.ClientCredentialsResourceDetails;
+import org.springframework.web.client.RestTemplate;
 
 import ch.ethz.seb.sebserver.ClientHttpRequestFactoryService;
 import ch.ethz.seb.sebserver.gbl.api.APIMessage;
@@ -36,7 +45,6 @@ import ch.ethz.seb.sebserver.gbl.model.exam.Exam;
 import ch.ethz.seb.sebserver.gbl.model.exam.QuizData;
 import ch.ethz.seb.sebserver.gbl.model.exam.SEBRestriction;
 import ch.ethz.seb.sebserver.gbl.model.institution.LmsSetup;
-import ch.ethz.seb.sebserver.gbl.model.institution.LmsSetup.Features;
 import ch.ethz.seb.sebserver.gbl.model.institution.LmsSetup.LmsType;
 import ch.ethz.seb.sebserver.gbl.model.institution.LmsSetupTestResult;
 import ch.ethz.seb.sebserver.gbl.model.user.ExamineeAccountDetails;
@@ -47,19 +55,23 @@ import ch.ethz.seb.sebserver.webservice.servicelayer.lms.APITemplateDataSupplier
 import ch.ethz.seb.sebserver.webservice.servicelayer.lms.LmsAPIService;
 import ch.ethz.seb.sebserver.webservice.servicelayer.lms.LmsAPITemplate;
 import ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.AbstractCachedCourseAccess;
+import ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat.OlatLmsData.AssessmentData;
+import ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat.OlatLmsData.RestrictionData;
+import ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat.OlatLmsData.RestrictionDataPost;
+import ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat.OlatLmsData.UserData;
 
 public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements LmsAPITemplate {
 
-    // TODO add needed dependencies here
+    private static final Logger log = LoggerFactory.getLogger(OlatLmsAPITemplate.class);
+
     private final ClientHttpRequestFactoryService clientHttpRequestFactoryService;
     private final ClientCredentialService clientCredentialService;
     private final APITemplateDataSupplier apiTemplateDataSupplier;
     private final Long lmsSetupId;
 
+    private OlatLmsRestTemplate cachedRestTemplate;
+
     protected OlatLmsAPITemplate(
-
-            // TODO if you need more dependencies inject them here and set the reference
-
             final ClientHttpRequestFactoryService clientHttpRequestFactoryService,
             final ClientCredentialService clientCredentialService,
             final APITemplateDataSupplier apiTemplateDataSupplier,
@@ -95,32 +107,19 @@ public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements Lm
         final LmsSetupTestResult testLmsSetupSettings = testLmsSetupSettings();
         if (testLmsSetupSettings.hasAnyError()) {
             return testLmsSetupSettings;
-        } else {
-
         }
-
+        try {
-        // TODO check if the course API of the remote LMS is available
+            this.getRestTemplate().get();
-        // if not, create corresponding LmsSetupTestResult error
+        } catch (final Exception e) {
-        return LmsSetupTestResult.ofQuizAccessAPIError(LmsType.OPEN_OLAT, "TODO: implement LMS access check");
+            log.error("Failed to access OLAT course API: ", e);
-
+            return LmsSetupTestResult.ofQuizAccessAPIError(LmsType.OPEN_OLAT, e.getMessage());
-        //return LmsSetupTestResult.ofOkay(LmsType.OPEN_OLAT);
+        }
+        return LmsSetupTestResult.ofOkay(LmsType.OPEN_OLAT);
     }
 
     @Override
     public LmsSetupTestResult testCourseRestrictionAPI() {
-        final LmsSetupTestResult testLmsSetupSettings = testLmsSetupSettings();
+        return testCourseAccessAPI();
-        if (testLmsSetupSettings.hasAnyError()) {
-            return testLmsSetupSettings;
-        }
-
-        if (LmsType.OPEN_OLAT.features.contains(Features.SEB_RESTRICTION)) {
-
-            // TODO check if the course API of the remote LMS is available
-            // if not, create corresponding LmsSetupTestResult error
-
-        }
-
-        return LmsSetupTestResult.ofOkay(LmsType.OPEN_OLAT);
     }
 
     private LmsSetupTestResult testLmsSetupSettings() {
@@ -207,62 +206,100 @@ public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements Lm
 
     @Override
     protected Supplier<List<QuizData>> allQuizzesSupplier(final FilterMap filterMap) {
-
-        @SuppressWarnings("unused")
-        final String quizName = filterMap.getString(QuizData.FILTER_ATTR_QUIZ_NAME);
-        @SuppressWarnings("unused")
-        final DateTime quizFromTime = (filterMap != null) ? filterMap.getQuizFromTime() : null;
-
         return () -> {
-
+            final List<QuizData> res = getRestTemplate()
-            // TODO Get all course / quiz data from remote LMS that matches the filter criteria.
+                    .map(t -> this.collectAllQuizzes(t, filterMap))
-            //      If the LMS API uses paging, go through all pages using the filter criteria
+                    .getOrThrow();
-            //      and collect the course data.
+            super.putToCache(res);
-            //      Transform the data from courses / quizzes from LMS into QuizData objects
+            return res;
-            //      Put loaded QuizData objects to the cache: super.putToCache(quizDataCollection);
-            //      before returning it.
-
-            throw new RuntimeException("TODO");
         };
     }
 
+    private String examUrl(final long olatRepositoryId) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        return lmsSetup.lmsApiUrl + "/auth/RepositoryEntry/" + olatRepositoryId;
+    }
+
+    private List<QuizData> collectAllQuizzes(final OlatLmsRestTemplate restTemplate, final FilterMap filterMap) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        final String quizName = filterMap.getString(QuizData.FILTER_ATTR_QUIZ_NAME);
+        final DateTime quizFromTime = (filterMap != null) ? filterMap.getQuizFromTime() : null;
+        final long fromCutTime = (quizFromTime != null) ? Utils.toUnixTimeInSeconds(quizFromTime) : -1;
+
+        String url = "/restapi/assessment_modes/seb?";
+        if (fromCutTime != -1) {
+            url = String.format("%sdateFrom=%s&", url, fromCutTime);
+        }
+        if (quizName != null) {
+            url = String.format("%sname=%s&", url, quizName);
+        }
+
+        final List<AssessmentData> as =
+                this.apiGetList(restTemplate, url, new ParameterizedTypeReference<List<AssessmentData>>() {
+                });
+        return as.stream()
+                .map(a -> {
+                    return new QuizData(
+                            String.format("%d", a.key),
+                            lmsSetup.getInstitutionId(),
+                            lmsSetup.id,
+                            lmsSetup.getLmsType(),
+                            a.name,
+                            a.description,
+                            Utils.toDateTimeUTC(a.dateFrom),
+                            Utils.toDateTimeUTC(a.dateTo),
+                            examUrl(a.repositoryEntryKey),
+                            new HashMap<String, String>());
+                })
+                .collect(Collectors.toList());
+    }
+
     @Override
     protected Supplier<Collection<QuizData>> quizzesSupplier(final Set<String> ids) {
-
+        return () -> ids.stream().map(id -> quizSupplier(id).get()).collect(Collectors.toList());
-        return () -> {
-
-            // TODO get all quiz / course data for specified identifiers from remote LMS
-            //      Transform the data from courses / quizzes from LMS into QuizData objects
-            //      and put it to the cache: super.putToCache(quizDataCollection);
-            //      before returning it.
-
-            throw new RuntimeException("TODO");
-        };
     }
 
     @Override
     protected Supplier<QuizData> quizSupplier(final String id) {
+        return () -> getRestTemplate()
+                .map(t -> this.quizById(t, id))
+                .getOrThrow();
+    }
 
-        return () -> {
+    private QuizData quizById(final OlatLmsRestTemplate restTemplate, final String id) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        final String url = String.format("/restapi/assessment_modes/%s", id);
+        final AssessmentData a = this.apiGet(restTemplate, url, AssessmentData.class);
+        return new QuizData(
+                String.format("%d", a.key),
+                lmsSetup.getInstitutionId(),
+                lmsSetup.id,
+                lmsSetup.getLmsType(),
+                a.name,
+                a.description,
+                Utils.toDateTimeUTC(a.dateFrom),
+                Utils.toDateTimeUTC(a.dateTo),
+                examUrl(a.repositoryEntryKey),
+                new HashMap<String, String>());
+    }
 
-            // TODO get the specified quiz / course data for specified identifier from remote LMS
+    private ExamineeAccountDetails getExamineeById(final RestTemplate restTemplate, final String id) {
-            //      and put it to the cache: super.putToCache(quizDataCollection);
+        final String url = String.format("/restapi/users/%s/name_username", id);
-            //      before returning it.
+        final UserData u = this.apiGet(restTemplate, url, UserData.class);
-
+        final Map<String, String> attrs = new HashMap<>();
-            throw new RuntimeException("TODO");
+        return new ExamineeAccountDetails(
-        };
+                String.valueOf(u.key),
+                u.lastName + ", " + u.firstName,
+                u.username,
+                "OLAT API does not provide email addresses",
+                attrs);
     }
 
     @Override
-    protected Supplier<ExamineeAccountDetails> accountDetailsSupplier(final String examineeSessionId) {
+    protected Supplier<ExamineeAccountDetails> accountDetailsSupplier(final String id) {
-
+        return () -> getRestTemplate()
-        return () -> {
+                .map(t -> this.getExamineeById(t, id))
-
+                .getOrThrow();
-            // TODO get the examinee's account details by the given examineeSessionId from remote LMS.
-            //      Currently only the name is needed to display on monitoring view.
-
-            throw new RuntimeException("TODO");
-        };
     }
 
     @Override
@@ -272,55 +309,105 @@ public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements Lm
         };
     }
 
+    private SEBRestriction getRestrictionForAssignmentId(final RestTemplate restTemplate, final String id) {
+        final String url = String.format("/restapi/assessment_modes/%s/seb_restriction", id);
+        final RestrictionData r = this.apiGet(restTemplate, url, RestrictionData.class);
+        return new SEBRestriction(Long.valueOf(id), r.configKeys, r.browserExamKeys, new HashMap<String, String>());
+    }
+
+    private SEBRestriction setRestrictionForAssignmentId(
+            final RestTemplate restTemplate,
+            final String id,
+            final SEBRestriction restriction) {
+
+        final String url = String.format("/restapi/assessment_modes/%s/seb_restriction", id);
+        final RestrictionDataPost post = new RestrictionDataPost();
+        post.browserExamKeys = new ArrayList<>(restriction.browserExamKeys);
+        post.configKeys = new ArrayList<>(restriction.configKeys);
+        final RestrictionData r =
+                this.apiPost(restTemplate, url, post, RestrictionDataPost.class, RestrictionData.class);
+        return new SEBRestriction(Long.valueOf(id), r.configKeys, r.browserExamKeys, new HashMap<String, String>());
+    }
+
+    private SEBRestriction deleteRestrictionForAssignmentId(final RestTemplate restTemplate, final String id) {
+        final String url = String.format("/restapi/assessment_modes/%s/seb_restriction", id);
+        final RestrictionData r = this.apiDelete(restTemplate, url, RestrictionData.class);
+        // OLAT returns RestrictionData with null values upon deletion.
+        // We return it here for consistency, even though SEB server does not need it
+        return new SEBRestriction(Long.valueOf(id), r.configKeys, r.browserExamKeys, new HashMap<String, String>());
+    }
+
     @Override
     public Result<SEBRestriction> getSEBClientRestriction(final Exam exam) {
-        @SuppressWarnings("unused")
+        return getRestTemplate()
-        final String quizId = exam.externalId;
+                .map(t -> this.getRestrictionForAssignmentId(t, exam.externalId));
-
-        return Result.tryCatch(() -> {
-
-            // TODO get the SEB client restrictions that are currently set on the remote LMS for
-            //      the given quiz / course derived from the given exam
-
-            throw new RuntimeException("TODO");
-        });
     }
 
     @Override
     public Result<SEBRestriction> applySEBClientRestriction(
             final String externalExamId,
             final SEBRestriction sebRestrictionData) {
-
+        return getRestTemplate()
-        return Result.tryCatch(() -> {
+                .map(t -> this.setRestrictionForAssignmentId(t, externalExamId, sebRestrictionData));
-
-            // TODO apply the given sebRestrictionData settings as current SEB client restriction setting
-            //      to the remote LMS for the given quiz / course.
-            //      Mainly SEBRestriction.configKeys and SEBRestriction.browserExamKeys
-
-            throw new RuntimeException("TODO");
-        });
     }
 
     @Override
     public Result<Exam> releaseSEBClientRestriction(final Exam exam) {
-        @SuppressWarnings("unused")
+        return getRestTemplate()
-        final String quizId = exam.externalId;
+                .map(t -> this.deleteRestrictionForAssignmentId(t, exam.externalId))
-
+                .map(x -> exam);
-        return Result.tryCatch(() -> {
-
-            // TODO Release respectively delete all SEB client restrictions for the given
-            //      course / quize on the remote LMS.
-
-            throw new RuntimeException("TODO");
-        });
     }
 
-    // TODO: This is an example of how to create a RestTemplate for the service to access the LMS API
+    private <T> T apiGet(final RestTemplate restTemplate, final String url, final Class<T> type) {
-    //       The example deals with a Http based API that is secured by an OAuth2 client-credential flow.
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
-    //       You might need some different template, then you have to adapt this code
+        final ResponseEntity<T> res = restTemplate.exchange(
-    //       To your needs.
+                lmsSetup.lmsApiUrl + url,
-    @SuppressWarnings("unused")
+                HttpMethod.GET,
-    private OAuth2RestTemplate createRestTemplate(final String accessTokenRequestPath) {
+                HttpEntity.EMPTY,
+                type);
+        return res.getBody();
+    }
+
+    private <T> List<T> apiGetList(final RestTemplate restTemplate, final String url,
+            final ParameterizedTypeReference<List<T>> type) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        final ResponseEntity<List<T>> res = restTemplate.exchange(
+                lmsSetup.lmsApiUrl + url,
+                HttpMethod.GET,
+                HttpEntity.EMPTY,
+                type);
+        return res.getBody();
+    }
+
+    private <P, R> R apiPost(final RestTemplate restTemplate, final String url, final P post, final Class<P> postType,
+            final Class<R> responseType) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        final HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.set("content-type", "application/json");
+        final HttpEntity<P> requestEntity = new HttpEntity<>(post, httpHeaders);
+        final ResponseEntity<R> res = restTemplate.exchange(
+                lmsSetup.lmsApiUrl + url,
+                HttpMethod.POST,
+                requestEntity,
+                responseType);
+        return res.getBody();
+    }
+
+    private <T> T apiDelete(final RestTemplate restTemplate, final String url, final Class<T> type) {
+        final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
+        final ResponseEntity<T> res = restTemplate.exchange(
+                lmsSetup.lmsApiUrl + url,
+                HttpMethod.DELETE,
+                HttpEntity.EMPTY,
+                type);
+        return res.getBody();
+    }
+
+    private Result<OlatLmsRestTemplate> getRestTemplate() {
+        return Result.tryCatch(() -> {
+            if (this.cachedRestTemplate != null) {
+                return this.cachedRestTemplate;
+            }
 
             final LmsSetup lmsSetup = this.apiTemplateDataSupplier.getLmsSetup();
             final ClientCredentials credentials = this.apiTemplateDataSupplier.getLmsClientCredentials();
@@ -332,7 +419,7 @@ public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements Lm
                     .getOrThrow();
 
             final ClientCredentialsResourceDetails details = new ClientCredentialsResourceDetails();
-        details.setAccessTokenUri(lmsSetup.lmsApiUrl + accessTokenRequestPath);
+            details.setAccessTokenUri(lmsSetup.lmsApiUrl + "/restapi/auth/");
             details.setClientId(plainClientId.toString());
             details.setClientSecret(plainClientSecret.toString());
 
@@ -340,10 +427,12 @@ public class OlatLmsAPITemplate extends AbstractCachedCourseAccess implements Lm
                     .getClientHttpRequestFactory(proxyData)
                     .getOrThrow();
 
-        final OAuth2RestTemplate template = new OAuth2RestTemplate(details);
+            final OlatLmsRestTemplate template = new OlatLmsRestTemplate(details);
             template.setRequestFactory(clientHttpRequestFactory);
 
-        return template;
+            this.cachedRestTemplate = template;
+            return this.cachedRestTemplate;
+        });
     }
 
 }

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsData.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat;
+
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public final class OlatLmsData {
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    static public final class AssessmentData {
+        /* OLAT API example:
+          {
+            "courseName": "course 1",
+            "dateFrom": 1624420800000,
+            "dateTo": 1624658400000,
+            "description": "",
+            "key": 6356992,
+            “repositoryEntryKey”: 462324,
+            "name": "SEB test"
+          }
+         */
+        public long key;
+        public long repositoryEntryKey;
+        public String name;
+        public String description;
+        public String courseName;
+        public long dateFrom;
+        public long dateTo;
+    }
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    static final class UserData {
+        /* OLAT API example:
+          {
+            "firstName": "OpenOLAT",
+            "key": 360448,
+            "lastName": "Administrator",
+            "username": "administrator"
+          }
+         */
+        public long key;
+        public String firstName;
+        public String lastName;
+        public String username;
+    }
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    static final class RestrictionData {
+        /* OLAT API example:
+          {
+            "browserExamKeys": [ "1" ],
+            "configKeys": null,
+            "key": 8028160
+          }
+         */
+        public long key;
+        public List<String> browserExamKeys;
+        public List<String> configKeys;
+    }
+
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    static final class RestrictionDataPost {
+        /* OLAT API example:
+          {
+            "configKeys": ["a", "b"],
+            "browserExamKeys": ["1", "2"]
+          }
+         */
+        public List<String> browserExamKeys;
+        public List<String> configKeys;
+    }
+
+}
+
+

src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.webservice.servicelayer.lms.impl.olat;
+
+import java.io.IOException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.web.client.RestTemplate;
+import org.springframework.security.oauth2.client.token.grant.client.ClientCredentialsResourceDetails;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.http.client.ClientHttpResponse;
+
+public class OlatLmsRestTemplate extends RestTemplate {
+
+    private static final Logger log = LoggerFactory.getLogger(OlatLmsRestTemplate.class);
+
+    private String token;
+    private ClientCredentialsResourceDetails details;
+
+    public OlatLmsRestTemplate(ClientCredentialsResourceDetails details) {
+        super();
+        this.details = details;
+
+        // Add X-OLAT-TOKEN request header to every request done using this RestTemplate
+        this.getInterceptors().add(new ClientHttpRequestInterceptor(){
+            @Override
+            public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
+                // if there's no token, authenticate first
+                if (token == null) { authenticate(); }
+                // when authenticating, just do a normal call
+                else if (token.equals("authenticating")) { return execution.execute(request, body); }
+                // otherwise, add the X-OLAT-TOKEN
+                request.getHeaders().set("accept", "application/json");
+                request.getHeaders().set("X-OLAT-TOKEN", token);
+                ClientHttpResponse response = execution.execute(request, body);
+                log.debug("OLAT [regular API call] {} Headers: {}", response.getStatusCode(), response.getHeaders());
+                // If we get a 401, re-authenticate and try once more
+                if (response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
+                    authenticate();
+                    request.getHeaders().set("X-OLAT-TOKEN", token);
+                    response = execution.execute(request, body);
+                    log.debug("OLAT [retry API call] {} Headers: {}", response.getStatusCode(), response.getHeaders());
+                }
+                return response;
+            }
+        });
+    }
+
+    private void authenticate() {
+        // Authenticate with OLAT and store the received X-OLAT-TOKEN
+        token = "authenticating";
+        final String authUrl = String.format("%s%s?password=%s",
+                details.getAccessTokenUri(),
+                details.getClientId(),
+                details.getClientSecret());
+        try {
+            final ResponseEntity<String> response = this.getForEntity(authUrl, String.class);
+            final HttpHeaders responseHeaders = response.getHeaders();
+            log.debug("OLAT [authenticate] {} Headers: {}", response.getStatusCode(), responseHeaders);
+            token = responseHeaders.getFirst("X-OLAT-TOKEN");
+        }
+        catch (Exception e) {
+            token = null;
+            throw e;
+        }
+    }
+
+
+}
+