feat: Add PDF file support for OpenAI vision models (#7217)

* feat: add base64 PDF support for OpenAI vision models

Signed-off-by: MurphyLo <1335758958@qq.com>

* sort imports in OpenAIResponseAPIClient.ts

* sort imports in OpenAIResponseAPIClient.ts

* remove pdf-parse

* modify pdfPageCount implementation to use officeparser built-in pdf.js

* chore: update yarn.lock to remove pdf-parse dependency

---------

Signed-off-by: MurphyLo <1335758958@qq.com>
Co-authored-by: suyao <sy20010504@gmail.com>

src/main/services/FileStorage.ts

@@ -15,6 +15,7 @@ import * as fs from 'fs'
 import { writeFileSync } from 'fs'
 import { readFile } from 'fs/promises'
 import officeParser from 'officeparser'
+import { getDocument } from 'officeparser/pdfjs-dist-build/pdf.js'
 import * as path from 'path'
 import { chdir } from 'process'
 import { v4 as uuidv4 } from 'uuid'
@@ -321,6 +322,16 @@ class FileStorage {
     return { data: base64, mime }
   }
 
+  public pdfPageCount = async (_: Electron.IpcMainInvokeEvent, id: string): Promise<number> => {
+    const filePath = path.join(this.storageDir, id)
+    const buffer = await fs.promises.readFile(filePath)
+
+    const doc = await getDocument({ data: buffer }).promise
+    const pages = doc.numPages
+    await doc.destroy()
+    return pages
+  }
+
   public binaryImage = async (_: Electron.IpcMainInvokeEvent, id: string): Promise<{ data: Buffer; mime: string }> => {
     const filePath = path.join(this.storageDir, id)
     const data = await fs.promises.readFile(filePath)