feat(Tag): Implement delete tag endpoint

src/main/java/org/wise/portal/presentation/web/controllers/tag/UserTagController.java

@@ -9,6 +9,7 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.access.annotation.Secured;
 import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -62,4 +63,13 @@ protected ResponseEntity<Map<String, Object>> updateTag(Authentication auth,
     userTagsService.updateTag(user, userTag);
     return ResponseEntityGenerator.createSuccess(userTag.toMap());
   }
+
+  @DeleteMapping("/user/tag/{tagId}")
+  protected ResponseEntity<Map<String, Object>> deleteTag(Authentication auth,
+      @PathVariable("tagId") Long tagId) {
+    User user = userService.retrieveUserByUsername(auth.getName());
+    UserTag tag = userTagsService.get(tagId);
+    userTagsService.deleteTag(user, tag);
+    return ResponseEntityGenerator.createSuccess(tag.toMap());
+  }
 }

src/main/java/org/wise/portal/service/usertags/UserTagsService.java

@@ -28,4 +28,6 @@ public interface UserTagsService {
   List<UserTag> getTags(User user);
 
   void updateTag(User user, UserTag tag);
+
+  void deleteTag(User user, UserTag tag);
 }

src/main/java/org/wise/portal/service/usertags/impl/UserTagsServiceImpl.java

@@ -18,6 +18,7 @@
 import org.wise.portal.domain.user.User;
 import org.wise.portal.domain.usertag.UserTag;
 import org.wise.portal.domain.usertag.impl.UserTagImpl;
+import org.wise.portal.service.project.ProjectService;
 import org.wise.portal.service.usertags.UserTagsService;
 
 @Service
@@ -26,6 +27,9 @@ public class UserTagsServiceImpl implements UserTagsService {
   @Autowired
   private AclTargetObjectIdentityDao<MutableAclTargetObjectIdentity> aclTargetObjectIdentityDao;
 
+  @Autowired
+  private ProjectService projectService;
+
   @Autowired
   private UserTagsDao<UserTag> userTagsDao;
 
@@ -99,4 +103,22 @@ public void updateTag(User user, UserTag tag) {
       throw new AccessDeniedException("User does not have permission to update tag.");
     }
   }
+
+  public void deleteTag(User user, UserTag tag) {
+    if (user.equals(tag.getUser())) {
+      removeTagFromProjects(projectService.getProjectList(user), tag);
+      removeTagFromProjects(projectService.getSharedProjectList(user), tag);
+      userTagsDao.delete(tag);
+    } else {
+      throw new AccessDeniedException("User does not have permission to delete tag.");
+    }
+  }
+
+  private void removeTagFromProjects(List<Project> projects, UserTag userTag) {
+    for (Project project : projects) {
+      MutableAclTargetObjectIdentity mutableObjectIdentity = getMutableObjectIdentity(project);
+      mutableObjectIdentity.getTags().remove(userTag);
+      aclTargetObjectIdentityDao.save(mutableObjectIdentity);
+    }
+  }
 }