Resolve "Move functionality from frontend to backend"

Closes #30 (closed)

backend/src/main/java/server/controller/AccountController.java

+package server.controller;
+
+import nl.tudelft.labracore.lib.security.user.AuthenticatedPerson;
+import nl.tudelft.labracore.lib.security.user.Person;
+
+import org.gitlab4j.api.GitLabApi;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+
+import server.service.AccountService;
+import server.service.InstanceMappingService;
+
+@Controller
+@RequestMapping("account")
+public class AccountController {
+
+	@Autowired
+	private AccountService accountService;
+
+	@Autowired
+	private InstanceMappingService instanceMappingService;
+
+	@GetMapping()
+	public String getAccount(Model model, @AuthenticatedPerson Person person) {
+		String netId = person.getUsername();
+
+		GitLabApi gitLabApi = instanceMappingService.getInstance(netId);
+
+		if (gitLabApi == null) {
+			model.addAttribute("message", "You do not have any key.");
+		} else {
+			model.addAttribute("message", "You already have a key.");
+		}
+
+		return "account";
+	}
+
+	/**
+	 * POST endpoint to add a GitLab API key to an existing user.
+	 *
+	 * @param apiKey String containing the key to be added.
+	 */
+	@PostMapping("/addKey")
+	public String addKey(@AuthenticatedPerson Person person, Model model,
+			@RequestParam(value = "apiKey") String apiKey) {
+		//String currentUser = gitBullSecurity.getCurrentUsername(apiKeyDTO.getSecret());
+
+		String netId = person.getUsername();
+
+		if (apiKey == null) {
+			model.addAttribute("message", "You need to enter a key first.");
+			return "redirect:/account";
+		}
+
+		accountService.addAPIKey(netId, apiKey);
+		instanceMappingService.addInstance(netId, apiKey);
+
+		model.addAttribute("message", "The key was added. You may go back.");
+
+		return "redirect:/account";
+	}
+
+	// TODO : look into override a get method with a delete
+	/**
+	 * GET endpoint to remove the GitLab API key of an existing user.
+	 *
+	 */
+	@GetMapping("/removeKey")
+	public String removeKey(@AuthenticatedPerson Person person, Model model) {
+		//String currentUser = gitBullSecurity.getCurrentUsername(apiKeyDTO.getSecret());
+
+		String netId = person.getUsername();
+
+		GitLabApi gitLabApi = instanceMappingService.getInstance(netId);
+
+		if (gitLabApi == null)
+			return "redirect:/account";
+
+		accountService.removeAPIKey(netId);
+		instanceMappingService.removeInstance(netId);
+
+		model.addAttribute("message", "Key successfully deleted.");
+		return "redirect:/account";
+	}
+}