From 85a1c694b3a4bb53aca1496d85cbf70107769706 Mon Sep 17 00:00:00 2001
From: Tilman Vatteroth <git@tilmanvatteroth.de>
Date: Sun, 3 Jul 2022 20:34:14 +0200
Subject: [PATCH] Add button to create note if not found (#2173)

* feat: add CreateNonExistentNote component

This component asks the user if they want to create the note that was request, but is not there.

Signed-off-by: Philip Molares <philip.molares@udo.edu>
Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
---
 locales/en.json                               | 26 +++---
 src/api/notes/index.ts                        |  2 +-
 ...reate-non-existing-note-hint.test.tsx.snap | 72 +++++++++++++++
 .../note-loading-boundary.test.tsx.snap       |  7 +-
 .../create-non-existing-note-hint.test.tsx    | 89 +++++++++++++++++++
 .../create-non-existing-note-hint.tsx         | 78 ++++++++++++++++
 .../note-loading-boundary.test.tsx            | 10 ++-
 .../note-loading-boundary.tsx                 | 11 ++-
 src/components/common/redirect.tsx            |  7 +-
 .../error-pages/common-error-page.tsx         | 24 ++---
 src/pages/[id].tsx                            |  4 +-
 11 files changed, 297 insertions(+), 33 deletions(-)
 create mode 100644 src/components/common/note-loading-boundary/__snapshots__/create-non-existing-note-hint.test.tsx.snap
 create mode 100644 src/components/common/note-loading-boundary/create-non-existing-note-hint.test.tsx
 create mode 100644 src/components/common/note-loading-boundary/create-non-existing-note-hint.tsx

diff --git a/locales/en.json b/locales/en.json
index 1aae02e15..04dc0abd2 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -41,12 +41,23 @@
     }
   },
   "noteLoadingBoundary": {
-    "errorWhileLoadingContent": "Error while loading note."
+    "createNote": {
+      "question": "Do you want to create a note with alias '{{aliasName}}'?",
+      "create": "Create note",
+      "creating": "Creating note...",
+      "error": "Note couldn't be created."
+    }
   },
   "api": {
     "note": {
-      "notFound": "Note not found.",
-      "accessDenied": "You don't have the needed permission to access this note."
+      "notFound": {
+        "title": "Note not found",
+        "description": "The requested note doesn't exist."
+      },
+      "forbidden": {
+        "title": "Access denied",
+        "description": "You don't have the needed permission to access this note"
+      }
     }
   },
   "landing": {
@@ -495,12 +506,7 @@
     "presentation": {},
     "readOnly": {
       "viewCount": "views",
-      "editNote": "Edit this note",
-      "loading": "Loading note contents ...",
-      "error": {
-        "title": "Error while loading note",
-        "description": "Probably the requested note does not exist or was deleted."
-      }
+      "editNote": "Edit this note"
     }
   },
   "common": {
@@ -564,7 +570,7 @@
   },
   "errors": {
     "notFound": {
-      "title": "404 - page not found",
+      "title": "Page not found",
       "description": "The requested page either does not exist or you don't have permission to access it."
     },
     "noteCreationFailed": {
diff --git a/src/api/notes/index.ts b/src/api/notes/index.ts
index a91c28280..d6c7382ec 100644
--- a/src/api/notes/index.ts
+++ b/src/api/notes/index.ts
@@ -16,7 +16,7 @@ import { DeleteApiRequestBuilder } from '../common/api-request-builder/delete-ap
  */
 export const getNote = async (noteIdOrAlias: string): Promise<Note> => {
   const response = await new GetApiRequestBuilder<Note>('notes/' + noteIdOrAlias)
-    .withStatusCodeErrorMapping({ 404: 'api.note.notFound', 403: 'api.note.accessDenied' })
+    .withStatusCodeErrorMapping({ 404: 'api.note.notFound', 403: 'api.note.forbidden' })
     .sendRequest()
   return response.asParsedJsonObject()
 }
diff --git a/src/components/common/note-loading-boundary/__snapshots__/create-non-existing-note-hint.test.tsx.snap b/src/components/common/note-loading-boundary/__snapshots__/create-non-existing-note-hint.test.tsx.snap
new file mode 100644
index 000000000..a2eed506b
--- /dev/null
+++ b/src/components/common/note-loading-boundary/__snapshots__/create-non-existing-note-hint.test.tsx.snap
@@ -0,0 +1,72 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`create non existing note hint redirects when the note has been created 1`] = `
+<div>
+  <span
+    data-testid="redirect"
+  >
+    Redirecting to
+     
+    <a
+      href="/n/mockedPrimaryAlias"
+    >
+      /n/mockedPrimaryAlias
+    </a>
+  </span>
+</div>
+`;
+
+exports[`create non existing note hint renders a waiting message when button is clicked 1`] = `
+<div>
+  <div
+    class="fade mt-5 alert alert-info show"
+    data-testid="loadingMessage"
+    role="alert"
+  >
+    <i
+      class="fa  fa-spinner fa-spin mr-2 "
+    />
+    noteLoadingBoundary.createNote.creating
+  </div>
+</div>
+`;
+
+exports[`create non existing note hint renders an button as initial state 1`] = `
+<div>
+  <div
+    class="fade mt-5 alert alert-info show"
+    data-testid="failedMessage"
+    role="alert"
+  >
+    <span>
+      noteLoadingBoundary.createNote.question
+    </span>
+    <div
+      class="mt-3"
+    >
+      <button
+        class="mx-2 btn btn-primary"
+        data-testid="createNoteButton"
+        type="submit"
+      >
+        noteLoadingBoundary.createNote.create
+      </button>
+    </div>
+  </div>
+</div>
+`;
+
+exports[`create non existing note hint shows an error message if note couldn't be created 1`] = `
+<div>
+  <div
+    class="fade mt-5 alert alert-info show"
+    data-testid="loadingMessage"
+    role="alert"
+  >
+    <i
+      class="fa  fa-spinner fa-spin mr-2 "
+    />
+    noteLoadingBoundary.createNote.creating
+  </div>
+</div>
+`;
diff --git a/src/components/common/note-loading-boundary/__snapshots__/note-loading-boundary.test.tsx.snap b/src/components/common/note-loading-boundary/__snapshots__/note-loading-boundary.test.tsx.snap
index e1754774c..81850aab0 100644
--- a/src/components/common/note-loading-boundary/__snapshots__/note-loading-boundary.test.tsx.snap
+++ b/src/components/common/note-loading-boundary/__snapshots__/note-loading-boundary.test.tsx.snap
@@ -19,14 +19,17 @@ exports[`Note loading boundary shows an error 1`] = `
   </span>
   <span>
     titleI18nKey: 
-    noteLoadingBoundary.errorWhileLoadingContent
+    api.note.notFound.title
   </span>
   <span>
     descriptionI18nKey: 
-    CRAAAAASH
+    api.note.notFound.description
   </span>
   <span>
     children: 
+    <span>
+      This is a mock for CreateNonExistingNoteHint
+    </span>
   </span>
 </div>
 `;
diff --git a/src/components/common/note-loading-boundary/create-non-existing-note-hint.test.tsx b/src/components/common/note-loading-boundary/create-non-existing-note-hint.test.tsx
new file mode 100644
index 000000000..5fd41bf69
--- /dev/null
+++ b/src/components/common/note-loading-boundary/create-non-existing-note-hint.test.tsx
@@ -0,0 +1,89 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as useSingleStringUrlParameterModule from '../../../hooks/common/use-single-string-url-parameter'
+import { mockI18n } from '../../markdown-renderer/test-utils/mock-i18n'
+import { render, screen } from '@testing-library/react'
+import { CreateNonExistingNoteHint } from './create-non-existing-note-hint'
+import * as createNoteWithPrimaryAliasModule from '../../../api/notes'
+import type { Note, NoteMetadata } from '../../../api/notes/types'
+import { Mock } from 'ts-mockery'
+
+describe('create non existing note hint', () => {
+  const mockedNoteId = 'mockedNoteId'
+
+  const mockGetNoteIdQueryParameter = () => {
+    const expectedQueryParameter = 'noteId'
+    jest.spyOn(useSingleStringUrlParameterModule, 'useSingleStringUrlParameter').mockImplementation((parameter) => {
+      expect(parameter).toBe(expectedQueryParameter)
+      return mockedNoteId
+    })
+  }
+
+  const mockCreateNoteWithPrimaryAlias = () => {
+    jest
+      .spyOn(createNoteWithPrimaryAliasModule, 'createNoteWithPrimaryAlias')
+      .mockImplementation((markdown, primaryAlias): Promise<Note> => {
+        expect(markdown).toBe('')
+        expect(primaryAlias).toBe(mockedNoteId)
+        const metadata: NoteMetadata = Mock.of<NoteMetadata>({ primaryAddress: 'mockedPrimaryAlias' })
+        return Promise.resolve(Mock.of<Note>({ metadata }))
+      })
+  }
+
+  const mockFailingCreateNoteWithPrimaryAlias = () => {
+    jest
+      .spyOn(createNoteWithPrimaryAliasModule, 'createNoteWithPrimaryAlias')
+      .mockImplementation((markdown, primaryAlias): Promise<Note> => {
+        expect(markdown).toBe('')
+        expect(primaryAlias).toBe(mockedNoteId)
+        return Promise.reject("couldn't create note")
+      })
+  }
+
+  afterEach(() => {
+    jest.resetAllMocks()
+    jest.resetModules()
+  })
+
+  beforeEach(async () => {
+    await mockI18n()
+    mockGetNoteIdQueryParameter()
+  })
+
+  it('renders an button as initial state', () => {
+    mockCreateNoteWithPrimaryAlias()
+    const view = render(<CreateNonExistingNoteHint></CreateNonExistingNoteHint>)
+    expect(view.container).toMatchSnapshot()
+  })
+
+  it('renders a waiting message when button is clicked', async () => {
+    mockCreateNoteWithPrimaryAlias()
+    const view = render(<CreateNonExistingNoteHint></CreateNonExistingNoteHint>)
+    const button = await screen.findByTestId('createNoteButton')
+    button.click()
+    await screen.findByTestId('loadingMessage')
+    expect(view.container).toMatchSnapshot()
+  })
+
+  it('redirects when the note has been created', async () => {
+    mockCreateNoteWithPrimaryAlias()
+    const view = render(<CreateNonExistingNoteHint></CreateNonExistingNoteHint>)
+    const button = await screen.findByTestId('createNoteButton')
+    button.click()
+    await screen.findByTestId('redirect')
+    expect(view.container).toMatchSnapshot()
+  })
+
+  it("shows an error message if note couldn't be created", async () => {
+    mockFailingCreateNoteWithPrimaryAlias()
+    const view = render(<CreateNonExistingNoteHint></CreateNonExistingNoteHint>)
+    const button = await screen.findByTestId('createNoteButton')
+    button.click()
+    await screen.findByTestId('failedMessage')
+    expect(view.container).toMatchSnapshot()
+  })
+})
diff --git a/src/components/common/note-loading-boundary/create-non-existing-note-hint.tsx b/src/components/common/note-loading-boundary/create-non-existing-note-hint.tsx
new file mode 100644
index 000000000..daa11046a
--- /dev/null
+++ b/src/components/common/note-loading-boundary/create-non-existing-note-hint.tsx
@@ -0,0 +1,78 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Trans, useTranslation } from 'react-i18next'
+import React, { useCallback } from 'react'
+import { Alert, Button } from 'react-bootstrap'
+import { useSingleStringUrlParameter } from '../../../hooks/common/use-single-string-url-parameter'
+import { createNoteWithPrimaryAlias } from '../../../api/notes'
+import { useAsyncFn } from 'react-use'
+import { ShowIf } from '../show-if/show-if'
+import { Redirect } from '../redirect'
+import { ForkAwesomeIcon } from '../fork-awesome/fork-awesome-icon'
+import { testId } from '../../../utils/test-id'
+
+/**
+ * Shows a button that creates an empty note with the alias from the current window URL.
+ * When the button was clicked it also shows the progress.
+ */
+export const CreateNonExistingNoteHint: React.FC = () => {
+  useTranslation()
+  const noteIdFromUrl = useSingleStringUrlParameter('noteId', undefined)
+
+  const [returnState, createNote] = useAsyncFn(async () => {
+    if (noteIdFromUrl === undefined) {
+      throw new Error('Note id not set')
+    }
+    return await createNoteWithPrimaryAlias('', noteIdFromUrl)
+  }, [noteIdFromUrl])
+
+  const onClickHandler = useCallback(() => {
+    void createNote()
+  }, [createNote])
+
+  if (noteIdFromUrl === undefined) {
+    return null
+  } else if (returnState.value) {
+    return <Redirect to={`/n/${returnState.value.metadata.primaryAddress}`} />
+  } else if (returnState.loading) {
+    return (
+      <Alert variant={'info'} {...testId('loadingMessage')} className={'mt-5'}>
+        <ForkAwesomeIcon icon={'spinner'} className={'fa-spin mr-2'} />
+        <Trans i18nKey={'noteLoadingBoundary.createNote.creating'} />
+      </Alert>
+    )
+  } else if (returnState.error !== undefined) {
+    return (
+      <Alert variant={'danger'} {...testId('failedMessage')} className={'mt-5'}>
+        <ForkAwesomeIcon icon={'exclamation-triangle'} className={'mr-1'} />
+        <Trans i18nKey={'noteLoadingBoundary.createNote.error'} />
+      </Alert>
+    )
+  } else {
+    return (
+      <Alert variant={'info'} {...testId('failedMessage')} className={'mt-5'}>
+        <span>
+          <Trans i18nKey={'noteLoadingBoundary.createNote.question'} values={{ aliasName: noteIdFromUrl }} />
+        </span>
+        <div className={'mt-3'}>
+          <Button
+            autoFocus
+            type='submit'
+            variant='primary'
+            className='mx-2'
+            onClick={onClickHandler}
+            {...testId('createNoteButton')}>
+            <ShowIf condition={returnState.loading}>
+              <ForkAwesomeIcon icon={'spinner'} className={'fa-spin mr-2'} />
+            </ShowIf>
+            <Trans i18nKey={'noteLoadingBoundary.createNote.create'} />
+          </Button>
+        </div>
+      </Alert>
+    )
+  }
+}
diff --git a/src/components/common/note-loading-boundary/note-loading-boundary.test.tsx b/src/components/common/note-loading-boundary/note-loading-boundary.test.tsx
index 6b181cb8f..ed69ad7a6 100644
--- a/src/components/common/note-loading-boundary/note-loading-boundary.test.tsx
+++ b/src/components/common/note-loading-boundary/note-loading-boundary.test.tsx
@@ -15,6 +15,7 @@ import { Fragment } from 'react'
 import { mockI18n } from '../../markdown-renderer/test-utils/mock-i18n'
 import * as CommonErrorPageModule from '../../error-pages/common-error-page'
 import * as LoadingScreenModule from '../../../components/application-loader/loading-screen/loading-screen'
+import * as CreateNonExistingNoteHintModule from './create-non-existing-note-hint'
 
 describe('Note loading boundary', () => {
   const mockedNoteId = 'mockedNoteId'
@@ -26,6 +27,13 @@ describe('Note loading boundary', () => {
 
   beforeEach(async () => {
     await mockI18n()
+    jest.spyOn(CreateNonExistingNoteHintModule, 'CreateNonExistingNoteHint').mockImplementation(() => {
+      return (
+        <Fragment>
+          <span>This is a mock for CreateNonExistingNoteHint</span>
+        </Fragment>
+      )
+    })
     jest.spyOn(LoadingScreenModule, 'LoadingScreen').mockImplementation(({ errorMessage }) => {
       return (
         <Fragment>
@@ -70,7 +78,7 @@ describe('Note loading boundary', () => {
     jest.spyOn(getNoteModule, 'getNote').mockImplementation((id) => {
       expect(id).toBe(mockedNoteId)
       return new Promise((resolve, reject) => {
-        setTimeout(() => reject(new Error('CRAAAAASH')), 0)
+        setTimeout(() => reject(new Error('api.note.notFound')), 0)
       })
     })
   }
diff --git a/src/components/common/note-loading-boundary/note-loading-boundary.tsx b/src/components/common/note-loading-boundary/note-loading-boundary.tsx
index 8886af232..c0eece89f 100644
--- a/src/components/common/note-loading-boundary/note-loading-boundary.tsx
+++ b/src/components/common/note-loading-boundary/note-loading-boundary.tsx
@@ -9,6 +9,8 @@ import React, { Fragment } from 'react'
 import { useLoadNoteFromServer } from './hooks/use-load-note-from-server'
 import { LoadingScreen } from '../../application-loader/loading-screen/loading-screen'
 import { CommonErrorPage } from '../../error-pages/common-error-page'
+import { CreateNonExistingNoteHint } from './create-non-existing-note-hint'
+import { ShowIf } from '../show-if/show-if'
 
 /**
  * Loads the note identified by the note-id in the URL.
@@ -24,10 +26,11 @@ export const NoteLoadingBoundary: React.FC<PropsWithChildren<unknown>> = ({ chil
     return <LoadingScreen />
   } else if (error) {
     return (
-      <CommonErrorPage
-        titleI18nKey={'noteLoadingBoundary.errorWhileLoadingContent'}
-        descriptionI18nKey={error.message}
-      />
+      <CommonErrorPage titleI18nKey={`${error.message}.title`} descriptionI18nKey={`${error.message}.description`}>
+        <ShowIf condition={error.message === 'api.note.notFound'}>
+          <CreateNonExistingNoteHint />
+        </ShowIf>
+      </CommonErrorPage>
     )
   } else {
     return <Fragment>{children}</Fragment>
diff --git a/src/components/common/redirect.tsx b/src/components/common/redirect.tsx
index 87946fab4..78e550866 100644
--- a/src/components/common/redirect.tsx
+++ b/src/components/common/redirect.tsx
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -8,6 +8,7 @@ import Link from 'next/link'
 import React, { useEffect } from 'react'
 import { useRouter } from 'next/router'
 import { Logger } from '../../utils/logger'
+import { testId } from '../../utils/test-id'
 
 export interface RedirectProps {
   to: string
@@ -24,13 +25,13 @@ export const Redirect: React.FC<RedirectProps> = ({ to }) => {
   const router = useRouter()
 
   useEffect(() => {
-    router.push(to).catch((error: Error) => {
+    router?.push(to).catch((error: Error) => {
       logger.error(`Error while redirecting to ${to}`, error)
     })
   })
 
   return (
-    <span>
+    <span {...testId('redirect')}>
       Redirecting to{' '}
       <Link href={to}>
         <a>{to}</a>
diff --git a/src/components/error-pages/common-error-page.tsx b/src/components/error-pages/common-error-page.tsx
index 2a29170a6..681154bf6 100644
--- a/src/components/error-pages/common-error-page.tsx
+++ b/src/components/error-pages/common-error-page.tsx
@@ -4,10 +4,11 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import React from 'react'
 import type { PropsWithChildren } from 'react'
+import React from 'react'
 import { LandingLayout } from '../landing-layout/landing-layout'
-import { useTranslation } from 'react-i18next'
+import { Trans, useTranslation } from 'react-i18next'
+import { ShowIf } from '../common/show-if/show-if'
 
 export interface CommonErrorPageProps {
   titleI18nKey: string
@@ -26,17 +27,20 @@ export const CommonErrorPage: React.FC<PropsWithChildren<CommonErrorPageProps>>
   descriptionI18nKey,
   children
 }) => {
-  const { t } = useTranslation()
+  useTranslation()
 
   return (
     <LandingLayout>
-      <div className='text-light d-flex align-items-center justify-content-center my-5'>
-        <div>
-          <h1>{t(titleI18nKey)}</h1>
-          <br />
-          {descriptionI18nKey ? t(descriptionI18nKey) : null}
-          {children}
-        </div>
+      <div className='text-light d-flex flex-column align-items-center justify-content-center my-5'>
+        <h1>
+          <Trans i18nKey={titleI18nKey} />
+        </h1>
+        <ShowIf condition={!!descriptionI18nKey}>
+          <h3>
+            <Trans i18nKey={descriptionI18nKey} />
+          </h3>
+        </ShowIf>
+        {children}
       </div>
     </LandingLayout>
   )
diff --git a/src/pages/[id].tsx b/src/pages/[id].tsx
index 808b97d03..7d6c4cd82 100644
--- a/src/pages/[id].tsx
+++ b/src/pages/[id].tsx
@@ -10,7 +10,7 @@ import type { NextPage } from 'next'
 import { useAsync } from 'react-use'
 import { Redirect } from '../components/common/redirect'
 import { useSingleStringUrlParameter } from '../hooks/common/use-single-string-url-parameter'
-import { CommonErrorPage } from '../components/error-pages/common-error-page'
+import Custom404 from './404'
 
 /**
  * Redirects the user to the editor if the link is a root level direct link to a version 1 note.
@@ -30,7 +30,7 @@ export const DirectLinkFallback: NextPage = () => {
   })
 
   if (error !== undefined) {
-    return <CommonErrorPage titleI18nKey={'errors.notFound.title'} descriptionI18nKey={'errors.notFound.description'} />
+    return <Custom404 />
   } else if (value !== undefined) {
     return <Redirect to={`/n/${value}`} />
   } else {