Address PR review comments: correctly handle edge cases in canDisplay…

…LinkPreview (#7796)

packages/presentation/src/___tests___/link-preview.test.ts

@@ -0,0 +1,146 @@
+//
+// Copyright © 2025 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License")
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import { canDisplayLinkPreview, fetchLinkPreviewDetails, type LinkPreviewDetails } from '../link-preview'
+import { setMetadata } from '@hcengineering/platform'
+import plugin from '../plugin'
+
+const fechFunc =
+  (responseFunc: (input: RequestInfo | URL, init?: RequestInit) => Response) =>
+    async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+      return responseFunc(input, init)
+    }
+
+describe('canDisplayLinkPreview', () => {
+  it('should return false if hostname & title are undefined', () => {
+    const linkDetails: LinkPreviewDetails = {
+      image: 'test-image.jpg',
+      description: 'Test Description'
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(false)
+  })
+
+  it('should return false if both image and description are missing', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      title: 'Test Title'
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(false)
+  })
+
+  it('should return false if both title and description are empty', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      image: 'test-image.jpg',
+      title: '',
+      description: ''
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(false)
+  })
+
+  it('should return true if hostname, image, and title are present', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      image: 'test-image.jpg',
+      title: 'Test Title'
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(true)
+  })
+
+  it('should return true if hostname, description, and title are present', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      title: 'Test Title',
+      description: 'Test Description'
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(true)
+  })
+
+  it('should return false if hostname, image, and description are present', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      image: 'test-image.jpg',
+      description: 'Test Description'
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(false)
+  })
+
+  it('should handle whitespace in title and description', () => {
+    const linkDetails: LinkPreviewDetails = {
+      hostname: 'www.example.com',
+      image: 'test-image.jpg',
+      title: '  ',
+      description: '   '
+    }
+    expect(canDisplayLinkPreview(linkDetails)).toBe(false)
+  })
+
+  it('should fetch link preview details successfully', async () => {
+    const fetcher = fechFunc((url) =>
+      Response.json({
+        title: 'Test Title',
+        description: 'Test Description',
+        url: 'https://www.example.com',
+        icon: 'https://www.example.com/favicon.ico',
+        image: 'https://www.example.com/image.jpg'
+      })
+    )
+    const linkDetails = await fetchLinkPreviewDetails('https://www.example.com', 5000, fetcher)
+    expect(linkDetails).toEqual({
+      title: 'Test Title',
+      description: 'Test Description',
+      url: 'https://www.example.com',
+      icon: 'https://www.example.com/favicon.ico',
+      image: 'https://www.example.com/image.jpg'
+    })
+  })
+
+  it('should handle errors during fetching', async () => {
+    const fetcher = fechFunc(() => {
+      throw new Error('something went wrong')
+    })
+    expect(await fetchLinkPreviewDetails('https://www.example.com', 5000, fetcher)).toEqual({})
+  })
+
+  it('should handle timeout', async () => {
+    let fetcherCalled = false
+    const fetcher = fechFunc((req, params) => {
+      if (params?.signal === undefined) {
+        fail('missed signal')
+      }
+      fetcherCalled = true
+      return Response.json({})
+    })
+    await fetchLinkPreviewDetails('https://www.example.com', 50, fetcher)
+    expect(fetcherCalled).toBe(true)
+  })
+
+  it('should add auth token', async () => {
+    let tokenProvided = false
+    setMetadata(plugin.metadata.Token, 'token')
+    const fetcher = fechFunc((req, params) => {
+      if (!(params?.headers instanceof Headers)) {
+        fail('missed headers')
+      }
+      if (params.headers.get('Authorization') !== 'Bearer token') {
+        fail('missed token')
+      }
+      tokenProvided = true
+      return Response.json({})
+    })
+    await fetchLinkPreviewDetails('https://www.example.com', 50, fetcher)
+    expect(tokenProvided).toBe(true)
+  })
+})

packages/presentation/src/link-preview.ts

@@ -30,27 +30,30 @@ export interface LinkPreviewDetails {
 }
 
 export function canDisplayLinkPreview (val: LinkPreviewDetails): boolean {
-  if (val.hostname === undefined) {
+  if (isEmpty(val.host) && isEmpty(val.title)) {
     return false
   }
-  if (val.image === undefined && val.description?.trim() === '') {
-    return false
-  }
-  if (val.title?.trim() === '' && val.description?.trim() === '') {
+  if (isEmpty(val.description) && isEmpty(val.image)) {
     return false
   }
+
   return true
 }
 
-export async function fetchLinkPreviewDetails (url: string, timeoutMs = 15000): Promise<LinkPreviewDetails> {
+export async function fetchLinkPreviewDetails (
+  url: string,
+  timeoutMs = 5000,
+  fetcher = fetch
+): Promise<LinkPreviewDetails> {
   try {
     const linkPreviewUrl = getMetadata(plugin.metadata.LinkPreviewUrl)
-    let token: string = ''
+    const headers = new Headers()
     if (getMetadata(plugin.metadata.Token) !== undefined) {
-      token = getMetadata(plugin.metadata.Token) as string
+      const token = getMetadata(plugin.metadata.Token) as string
+      headers.set('Authorization', 'Bearer ' + token)
     }
-    const response = await fetch(`${linkPreviewUrl}/details?q=${url}`, {
-      headers: { Authorization: 'Bearer ' + token },
+    const response = await fetcher(`${linkPreviewUrl}/details?q=${url}`, {
+      headers,
       signal: AbortSignal.timeout(timeoutMs)
     })
     const res = (await response.json()) as LinkPreviewDetails
@@ -60,3 +63,7 @@ export async function fetchLinkPreviewDetails (url: string, timeoutMs = 15000):
     return {}
   }
 }
+
+function isEmpty (str: string | undefined): boolean {
+  return str === undefined || str.trim() === ''
+}