From 0922d928ff6fa0929e3d220eb2bd4a4cd2bdba68 Mon Sep 17 00:00:00 2001
From: Kim Shepherd <kim@shepherd.nz>
Date: Thu, 13 Feb 2025 15:00:17 +0100
Subject: [PATCH] Request-a-copy improv: Altcha recaptcha component and service

---
 .../proof-of-work-captcha-data.service.ts     | 25 ++++++++++
 .../altcha-captcha.component.html             |  6 +++
 .../altcha-captcha.component.spec.ts          | 46 +++++++++++++++++
 .../altcha-captcha.component.ts               | 50 +++++++++++++++++++
 4 files changed, 127 insertions(+)
 create mode 100644 src/app/core/data/proof-of-work-captcha-data.service.ts
 create mode 100644 src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.html
 create mode 100644 src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.spec.ts
 create mode 100644 src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.ts

diff --git a/src/app/core/data/proof-of-work-captcha-data.service.ts b/src/app/core/data/proof-of-work-captcha-data.service.ts
new file mode 100644
index 00000000000..1e1f886d36a
--- /dev/null
+++ b/src/app/core/data/proof-of-work-captcha-data.service.ts
@@ -0,0 +1,25 @@
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+
+@Injectable({ providedIn: 'root' })
+export class ProofOfWorkCaptchaDataService {
+
+  private linkPath = 'captcha';
+
+  constructor(
+              private halService: HALEndpointService) {
+  }
+
+  public getChallengeHref(): Observable<string> {
+    return this.getEndpoint().pipe(
+      map((endpoint) => endpoint + '/challenge'),
+    );
+  }
+
+  protected getEndpoint(): Observable<string> {
+    return this.halService.getEndpoint(this.linkPath);
+  }
+}
diff --git a/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.html b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.html
new file mode 100644
index 00000000000..c164c99b360
--- /dev/null
+++ b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.html
@@ -0,0 +1,6 @@
+<altcha-widget
+  id="altcha-widget"
+  auto="{{ autoload  }}"
+  expire="100000"
+  workers=16
+  challengeurl="{{ challengeUrl }}"></altcha-widget>
diff --git a/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.spec.ts b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.spec.ts
new file mode 100644
index 00000000000..98a2fe15864
--- /dev/null
+++ b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.spec.ts
@@ -0,0 +1,46 @@
+import {
+  ComponentFixture,
+  TestBed,
+} from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+
+import { AltchaCaptchaComponent } from './altcha-captcha.component';
+
+describe('AltchaCaptchaComponent', () => {
+  let component: AltchaCaptchaComponent;
+  let fixture: ComponentFixture<AltchaCaptchaComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [
+        TranslateModule.forRoot(),
+        AltchaCaptchaComponent,
+      ],
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(AltchaCaptchaComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create component successfully', () => {
+    expect(component).toBeTruthy();
+  });
+
+  it('should emit payload when verification is successful', () => {
+    const testPayload = 'test-payload';
+    const payloadSpy = jasmine.createSpy('payloadSpy');
+    component.payload.subscribe(payloadSpy);
+
+    const event = new CustomEvent('statechange', {
+      detail: {
+        state: 'verified',
+        payload: testPayload,
+      },
+    });
+
+    document.querySelector('#altcha-widget').dispatchEvent(event);
+
+    expect(payloadSpy).toHaveBeenCalledWith(testPayload);
+  });
+});
diff --git a/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.ts b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.ts
new file mode 100644
index 00000000000..9740068d676
--- /dev/null
+++ b/src/app/item-page/bitstreams/request-a-copy/altcha-captcha.component.ts
@@ -0,0 +1,50 @@
+import {
+  AsyncPipe,
+  NgIf,
+} from '@angular/common';
+import {
+  Component,
+  CUSTOM_ELEMENTS_SCHEMA,
+  EventEmitter,
+  Input,
+  OnInit,
+  Output,
+} from '@angular/core';
+import { ReactiveFormsModule } from '@angular/forms';
+import { RouterLink } from '@angular/router';
+import { TranslateModule } from '@ngx-translate/core';
+
+import { VarDirective } from '../../../shared/utils/var.directive';
+
+@Component({
+  selector: 'ds-altcha-captcha',
+  templateUrl: './altcha-captcha.component.html',
+  imports: [
+    TranslateModule,
+    RouterLink,
+    AsyncPipe,
+    ReactiveFormsModule,
+    NgIf,
+    VarDirective,
+  ],
+  schemas: [CUSTOM_ELEMENTS_SCHEMA],
+  standalone: true,
+})
+export class AltchaCaptchaComponent implements OnInit {
+
+  @Input() challengeUrl: string;
+  @Input() autoload: string;
+  @Input() debug: boolean;
+  @Output() payload = new EventEmitter<string>;
+
+  ngOnInit(): void {
+    document.querySelector('#altcha-widget').addEventListener('statechange', (ev: any) => {
+      // state can be: unverified, verifying, verified, error
+      if (ev.detail.state === 'verified') {
+        // payload contains base64 encoded data for the server
+        this.payload.emit(ev.detail.payload);
+      }
+    });
+  }
+
+}