Made legacy bitstream URLs redirect with 301 status code

src/app/bitstream-page/bitstream-page-routes.ts

@@ -11,7 +11,7 @@ import { BitstreamAuthorizationsComponent } from './bitstream-authorizations/bit
 import { BitstreamDownloadPageComponent } from './bitstream-download-page/bitstream-download-page.component';
 import { bitstreamPageResolver } from './bitstream-page.resolver';
 import { ThemedEditBitstreamPageComponent } from './edit-bitstream-page/themed-edit-bitstream-page.component';
-import { legacyBitstreamUrlResolver } from './legacy-bitstream-url.resolver';
+import { legacyBitstreamURLRedirectGuard } from './legacy-bitstream-url-redirect.guard';
 
 const EDIT_BITSTREAM_PATH = ':id/edit';
 const EDIT_BITSTREAM_AUTHORIZATIONS_PATH = ':id/authorizations';
@@ -24,17 +24,13 @@ export const ROUTES: Route[] = [
     // Resolve XMLUI bitstream download URLs
     path: 'handle/:prefix/:suffix/:filename',
     component: BitstreamDownloadPageComponent,
-    resolve: {
-      bitstream: legacyBitstreamUrlResolver,
-    },
+    canActivate: [legacyBitstreamURLRedirectGuard],
   },
   {
     // Resolve JSPUI bitstream download URLs
     path: ':prefix/:suffix/:sequence_id/:filename',
     component: BitstreamDownloadPageComponent,
-    resolve: {
-      bitstream: legacyBitstreamUrlResolver,
-    },
+    canActivate: [legacyBitstreamURLRedirectGuard],
   },
   {
     // Resolve angular bitstream download URLs

src/app/bitstream-page/legacy-bitstream-url-redirect.guard.spec.ts

@@ -0,0 +1,154 @@
+import { fakeAsync } from '@angular/core/testing';
+import { cold } from 'jasmine-marbles';
+import { EMPTY } from 'rxjs';
+
+import { PAGE_NOT_FOUND_PATH } from '../app-routing-paths';
+import { BitstreamDataService } from '../core/data/bitstream-data.service';
+import { RemoteData } from '../core/data/remote-data';
+import { RequestEntryState } from '../core/data/request-entry-state.model';
+import { Bitstream } from '../core/shared/bitstream.model';
+import { RouterStub } from '../shared/testing/router.stub';
+import { ServerResponseServiceStub } from '../shared/testing/server-response-service.stub';
+import { legacyBitstreamURLRedirectGuard } from './legacy-bitstream-url-redirect.guard';
+
+describe('legacyBitstreamURLRedirectGuard', () => {
+  let resolver: any;
+  let bitstreamDataService: BitstreamDataService;
+  let remoteDataMocks: { [type: string]: RemoteData<Bitstream> };
+  let route;
+  let state;
+  let serverResponseService: ServerResponseServiceStub;
+  let router: RouterStub;
+
+  beforeEach(() => {
+    route = {
+      params: {},
+      queryParams: {},
+    };
+    router = new RouterStub();
+    serverResponseService = new ServerResponseServiceStub();
+    state = {};
+    remoteDataMocks = {
+      RequestPending: new RemoteData(undefined, 0, 0, RequestEntryState.RequestPending, undefined, undefined, undefined),
+      ResponsePending: new RemoteData(undefined, 0, 0, RequestEntryState.ResponsePending, undefined, undefined, undefined),
+      Success: new RemoteData(0, 0, 0, RequestEntryState.Success, undefined, new Bitstream(), 200),
+      NoContent: new RemoteData(0, 0, 0, RequestEntryState.Success, undefined, undefined, 204),
+      Error: new RemoteData(0, 0, 0, RequestEntryState.Error, 'Internal server error', undefined, 500),
+    };
+    bitstreamDataService = {
+      findByItemHandle: () => undefined,
+    } as any;
+    resolver = legacyBitstreamURLRedirectGuard;
+  });
+
+  describe(`resolve`, () => {
+    describe(`For JSPUI-style URLs`, () => {
+      beforeEach(() => {
+        spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(EMPTY);
+        route = Object.assign({}, route, {
+          params: {
+            prefix: '123456789',
+            suffix: '1234',
+            filename: 'some-file.pdf',
+            sequence_id: '5',
+          },
+        });
+      });
+      it(`should call findByItemHandle with the handle, sequence id, and filename from the route`, () => {
+        resolver(route, state, bitstreamDataService, serverResponseService, router);
+        expect(bitstreamDataService.findByItemHandle).toHaveBeenCalledWith(
+          `${route.params.prefix}/${route.params.suffix}`,
+          route.params.sequence_id,
+          route.params.filename,
+        );
+      });
+    });
+
+    describe(`For XMLUI-style URLs`, () => {
+      describe(`when there is a sequenceId query parameter`, () => {
+        beforeEach(() => {
+          spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(EMPTY);
+          route = Object.assign({}, route, {
+            params: {
+              prefix: '123456789',
+              suffix: '1234',
+              filename: 'some-file.pdf',
+            },
+            queryParams: {
+              sequenceId: '5',
+            },
+          });
+        });
+        it(`should call findByItemHandle with the handle and filename from the route, and the sequence ID from the queryParams`, () => {
+          resolver(route, state, bitstreamDataService, serverResponseService, router);
+          expect(bitstreamDataService.findByItemHandle).toHaveBeenCalledWith(
+            `${route.params.prefix}/${route.params.suffix}`,
+            route.queryParams.sequenceId,
+            route.params.filename,
+          );
+        });
+      });
+      describe(`when there's no sequenceId query parameter`, () => {
+        beforeEach(() => {
+          spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(EMPTY);
+          route = Object.assign({}, route, {
+            params: {
+              prefix: '123456789',
+              suffix: '1234',
+              filename: 'some-file.pdf',
+            },
+          });
+        });
+        it(`should call findByItemHandle with the handle, and filename from the route`, () => {
+          resolver(route, state, bitstreamDataService, serverResponseService, router);
+          expect(bitstreamDataService.findByItemHandle).toHaveBeenCalledWith(
+            `${route.params.prefix}/${route.params.suffix}`,
+            undefined,
+            route.params.filename,
+          );
+        });
+      });
+    });
+    describe('should return and complete after the RemoteData has...', () => {
+      it('...failed', fakeAsync(() => {
+        spyOn(router, 'createUrlTree').and.callThrough();
+        spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(cold('a-b-c', {
+          a: remoteDataMocks.RequestPending,
+          b: remoteDataMocks.ResponsePending,
+          c: remoteDataMocks.Error,
+        }));
+        resolver(route, state, bitstreamDataService, serverResponseService, router).subscribe(() => {
+          expect(bitstreamDataService.findByItemHandle).toHaveBeenCalled();
+          expect(router.createUrlTree).toHaveBeenCalledWith([PAGE_NOT_FOUND_PATH]);
+        });
+      }));
+
+      it('...succeeded without content', fakeAsync(() => {
+        spyOn(router, 'createUrlTree').and.callThrough();
+        spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(cold('a-b-c', {
+          a: remoteDataMocks.RequestPending,
+          b: remoteDataMocks.ResponsePending,
+          c: remoteDataMocks.NoContent,
+        }));
+        resolver(route, state, bitstreamDataService, serverResponseService, router).subscribe(() => {
+          expect(bitstreamDataService.findByItemHandle).toHaveBeenCalled();
+          expect(router.createUrlTree).toHaveBeenCalledWith([PAGE_NOT_FOUND_PATH]);
+        });
+      }));
+
+      it('...succeeded', fakeAsync(() => {
+        spyOn(serverResponseService, 'setStatus').and.callThrough();
+        spyOn(bitstreamDataService, 'findByItemHandle').and.returnValue(cold('a-b-c', {
+          a: remoteDataMocks.RequestPending,
+          b: remoteDataMocks.ResponsePending,
+          c: remoteDataMocks.Success,
+        }));
+        resolver(route, state, bitstreamDataService, serverResponseService, router).subscribe(() => {
+          expect(bitstreamDataService.findByItemHandle).toHaveBeenCalled();
+          expect(serverResponseService.setStatus).toHaveBeenCalledWith(301);
+          expect(router.parseUrl).toHaveBeenCalled();
+        });
+      }));
+    });
+  });
+});

src/app/bitstream-page/legacy-bitstream-url-redirect.guard.ts

@@ -0,0 +1,63 @@
+import { inject } from '@angular/core';
+import {
+  ActivatedRouteSnapshot,
+  CanActivateFn,
+  Router,
+  RouterStateSnapshot,
+  UrlTree,
+} from '@angular/router';
+import { Observable } from 'rxjs';
+import {
+  map,
+  tap,
+} from 'rxjs/operators';
+
+import { PAGE_NOT_FOUND_PATH } from '../app-routing-paths';
+import { BitstreamDataService } from '../core/data/bitstream-data.service';
+import { RemoteData } from '../core/data/remote-data';
+import { ServerResponseService } from '../core/services/server-response.service';
+import { Bitstream } from '../core/shared/bitstream.model';
+import { getFirstCompletedRemoteData } from '../core/shared/operators';
+import { hasNoValue } from '../shared/empty.util';
+
+/**
+ * Redirects to a bitstream based on the handle of the item, and the sequence id or the filename of the
+ * bitstream. In production mode the status code will also be set the status code to 301 marking it as a permanent URL
+ * redirect for bots.
+ *
+ * @returns Observable<UrlTree> Returns a URL to redirect the user to the new URL format
+ */
+export const legacyBitstreamURLRedirectGuard: CanActivateFn = (
+  route: ActivatedRouteSnapshot,
+  state: RouterStateSnapshot,
+  bitstreamDataService: BitstreamDataService = inject(BitstreamDataService),
+  serverResponseService: ServerResponseService = inject(ServerResponseService),
+  router: Router = inject(Router),
+): Observable<UrlTree> => {
+  const prefix = route.params.prefix;
+  const suffix = route.params.suffix;
+  const filename = route.params.filename;
+  let sequenceId = route.params.sequence_id;
+  if (hasNoValue(sequenceId)) {
+    sequenceId = route.queryParams.sequenceId;
+  }
+  return bitstreamDataService.findByItemHandle(
+    `${prefix}/${suffix}`,
+    sequenceId,
+    filename,
+  ).pipe(
+    getFirstCompletedRemoteData(),
+    tap((rd: RemoteData<Bitstream>) => {
+      if (rd.hasSucceeded && !rd.hasNoContent) {
+        serverResponseService.setStatus(301);
+      }
+    }),
+    map((rd: RemoteData<Bitstream>) => {
+      if (rd.hasSucceeded && !rd.hasNoContent) {
+        return router.parseUrl(`/bitstreams/${rd.payload.uuid}/download`);
+      } else {
+        return router.createUrlTree([PAGE_NOT_FOUND_PATH]);
+      }
+    }),
+  );
+};