[#11878] Add CAPTCHA to ARF (#13081)

* Add captcha to ARF

* Update front-end tests

* Fix lint errors

* Change captcha to uppercase in error text

* Return captcha response when the getter is called

---------

Co-authored-by: Jay Aljelo Ting <65202977+jayasting98@users.noreply.github.com>

src/main/java/teammates/ui/request/AccountCreateRequest.java

@@ -18,6 +18,8 @@ public class AccountCreateRequest extends BasicRequest {
     private String instructorInstitution;
     @Nullable
     private String instructorComments;
+    @Nullable
+    private String captchaResponse;
 
     public String getInstructorEmail() {
         return instructorEmail;
@@ -35,6 +37,10 @@ public String getInstructorComments() {
         return this.instructorComments;
     }
 
+    public String getCaptchaResponse() {
+        return this.captchaResponse;
+    }
+
     public void setInstructorName(String name) {
         this.instructorName = name;
     }
@@ -51,6 +57,10 @@ public void setInstructorComments(String instructorComments) {
         this.instructorComments = instructorComments;
     }
 
+    public void setCaptchaResponse(String captchaResponse) {
+        this.captchaResponse = captchaResponse;
+    }
+
     @Override
     public void validate() throws InvalidHttpRequestBodyException {
         assertTrue(this.instructorEmail != null, "email cannot be null");

src/main/java/teammates/ui/webapi/CreateAccountRequestAction.java

@@ -33,6 +33,14 @@ public JsonResult execute()
             throws InvalidHttpRequestBodyException, InvalidOperationException {
         AccountCreateRequest createRequest = getAndValidateRequestBody(AccountCreateRequest.class);
 
+        if (userInfo == null || !userInfo.isAdmin) {
+            String userCaptchaResponse = createRequest.getCaptchaResponse();
+            if (!recaptchaVerifier.isVerificationSuccessful(userCaptchaResponse)) {
+                throw new InvalidHttpRequestBodyException("Something went wrong with "
+                        + "the reCAPTCHA verification. Please try again.");
+            }
+        }
+
         String instructorName = createRequest.getInstructorName().trim();
         String instructorEmail = createRequest.getInstructorEmail().trim();
         String instructorInstitution = createRequest.getInstructorInstitution().trim();

src/web/app/pages-static/request-page/instructor-request-form/__snapshots__/instructor-request-form.component.spec.ts.snap

@@ -8,15 +8,19 @@ exports[`InstructorRequestFormComponent should render correctly 1`] = `
   STUDENT_NAME_MAX_LENGTH={[Function Number]}
   accountService={[Function Object]}
   arf={[Function FormGroup]}
+  captchaSiteKey=""
   comments={[Function FormControl2]}
   country={[Function FormControl2]}
   email={[Function FormControl2]}
   hasSubmitAttempt="false"
   institution={[Function FormControl2]}
+  isCaptchaSuccessful="false"
   isLoading="false"
+  lang={[Function String]}
   name={[Function FormControl2]}
   requestSubmissionEvent={[Function EventEmitter_]}
   serverErrorMessage=""
+  size={[Function String]}
 >
   <p
     aria-hidden="true"

src/web/app/pages-static/request-page/instructor-request-form/instructor-request-form.component.html

@@ -105,6 +105,22 @@
       [attr.aria-invalid]="comments.invalid"></textarea>
   </div>
   <br>
+  <div *ngIf="captchaSiteKey !== ''" class="form-group">
+    <ngx-recaptcha2 #captchaElem
+                    [siteKey]="captchaSiteKey"
+                    (success)="handleCaptchaSuccess($event)"
+                    [useGlobalDomain]="false"
+                    [size]="size"
+                    [hl]="lang"
+                    formControlName="recaptcha"
+                    class="{{!isCaptchaSuccessful ? ' is-invalid' : ''}}">
+    </ngx-recaptcha2>
+    <div *ngIf="!isCaptchaSuccessful && hasSubmitAttempt" role="alert" tabindex="0"
+      class="invalid-feedback">
+      Please complete the CAPTCHA verification.
+    </div>
+    <br>
+  </div>
   <ngb-alert type="danger" [dismissible]="false" *ngIf="hasSubmitAttempt && arf.invalid" class="error-box">
     <strong>There was a problem with your submission.</strong> Please check and fix the errors above and submit again.
   </ngb-alert>

src/web/app/pages-static/request-page/instructor-request-form/instructor-request-form.component.spec.ts

@@ -1,6 +1,7 @@
 import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 import { ReactiveFormsModule } from '@angular/forms';
 import { By } from '@angular/platform-browser';
+import { NgxCaptchaModule } from 'ngx-captcha';
 import { Observable, first } from 'rxjs';
 import { InstructorRequestFormModel } from './instructor-request-form-model';
 import { InstructorRequestFormComponent } from './instructor-request-form.component';
@@ -46,7 +47,7 @@ describe('InstructorRequestFormComponent', () => {
   beforeEach(waitForAsync(() => {
     TestBed.configureTestingModule({
       declarations: [InstructorRequestFormComponent],
-      imports: [ReactiveFormsModule],
+      imports: [ReactiveFormsModule, NgxCaptchaModule],
       providers: [{ provide: AccountService, useValue: accountServiceStub }],
     })
     .compileComponents();
@@ -56,10 +57,15 @@ describe('InstructorRequestFormComponent', () => {
     fixture = TestBed.createComponent(InstructorRequestFormComponent);
     component = fixture.componentInstance;
     accountService = TestBed.inject(AccountService);
+    component.captchaSiteKey = ''; // Test ignores captcha
     fixture.detectChanges();
     jest.clearAllMocks();
   });
 
+  it('should have empty captcha key', () => {
+    expect(component).toBeTruthy();
+  });
+
   it('should create', () => {
     expect(component).toBeTruthy();
   });

src/web/app/pages-static/request-page/instructor-request-form/instructor-request-form.component.ts

@@ -2,6 +2,7 @@ import { Component, EventEmitter, Output } from '@angular/core';
 import { FormControl, FormGroup, Validators } from '@angular/forms';
 import { finalize } from 'rxjs';
 import { InstructorRequestFormModel } from './instructor-request-form-model';
+import { environment } from '../../../../environments/environment';
 import { AccountService } from '../../../../services/account.service';
 import { AccountCreateRequest } from '../../../../types/api-request';
 import { FormValidator } from '../../../../types/form-validator';
@@ -22,6 +23,13 @@ export class InstructorRequestFormComponent {
   readonly COUNTRY_NAME_MAX_LENGTH = FormValidator.COUNTRY_NAME_MAX_LENGTH;
   readonly EMAIL_MAX_LENGTH = FormValidator.EMAIL_MAX_LENGTH;
 
+  // Captcha
+  captchaSiteKey: string = environment.captchaSiteKey;
+  isCaptchaSuccessful: boolean = false;
+  captchaResponse?: string;
+  size: 'compact' | 'normal' = 'normal';
+  lang: string = 'en';
+
   arf = new FormGroup({
     name: new FormControl('', [
       Validators.required,
@@ -44,6 +52,7 @@ export class InstructorRequestFormComponent {
       Validators.maxLength(FormValidator.EMAIL_MAX_LENGTH),
     ]),
     comments: new FormControl(''),
+    recaptcha: new FormControl(''),
   }, { updateOn: 'submit' });
 
   // Create members for easier access of arf controls
@@ -79,12 +88,25 @@ export class InstructorRequestFormComponent {
     return str;
   }
 
+  /**
+   * Handles successful completion of reCAPTCHA challenge.
+   *
+   * @param captchaResponse user's reCAPTCHA response token.
+   */
+  handleCaptchaSuccess(captchaResponse: string): void {
+    this.isCaptchaSuccessful = true;
+    this.captchaResponse = captchaResponse;
+  }
+
+  /**
+   * Handles form submission.
+   */
   onSubmit(): void {
     this.hasSubmitAttempt = true;
     this.isLoading = true;
     this.serverErrorMessage = '';
 
-    if (this.arf.invalid) {
+    if (this.arf.invalid || (this.captchaSiteKey && !this.captchaResponse)) {
       this.isLoading = false;
       // Do not submit form
       return;
@@ -103,6 +125,7 @@ export class InstructorRequestFormComponent {
       instructorEmail: email,
       instructorName: name,
       instructorInstitution: combinedInstitution,
+      captchaResponse: this.captchaSiteKey ? this.captchaResponse! : '',
     };
 
     if (comments) {

src/web/app/pages-static/request-page/request-page.module.ts

@@ -3,6 +3,7 @@ import { NgModule } from '@angular/core';
 import { ReactiveFormsModule } from '@angular/forms';
 import { RouterModule, Routes } from '@angular/router';
 import { NgbAlertModule } from '@ng-bootstrap/ng-bootstrap';
+import { NgxCaptchaModule } from 'ngx-captcha';
 import { InstructorRequestFormComponent } from './instructor-request-form/instructor-request-form.component';
 import { RequestPageComponent } from './request-page.component';
 import { TeammatesRouterModule } from '../../components/teammates-router/teammates-router.module';
@@ -31,6 +32,7 @@ const routes: Routes = [
     TeammatesRouterModule,
     ReactiveFormsModule,
     NgbAlertModule,
+    NgxCaptchaModule,
   ],
 })
 export class RequestPageModule { }