Why can't I get a thumbnail of a pdf file with Google Drive API?

[tommy_iaw]

Hi there,

I would like to upload a pdf file with Google Drive API and get its thumbnail.
A few weeks ago this was possible, but yesterday I noticed that I can no longer get the thumbnail link.
Has the specification of the Google Drive API changed or is there something I need to be aware of when using this API?

I can confirm that even if I upload a pdf file with the sample code below and get the file information, I cannot get a Thumbnail link.

upload_file.go

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package main

import (

"context"

"fmt"

"io/ioutil"

"log"

"os"

"golang.org/x/oauth2/google"

"google.golang.org/api/drive/v3"

)

func main() {

ctx := context.Background()

b, err := ioutil.ReadFile("secret.json")

if err != nil {

log.Fatalf("Unable to read client secret file: %v", err)

}

config, err := google.JWTConfigFromJSON(b, drive.DriveScope)

if err != nil {

log.Fatalf("Unable to parse client secret file to config: %v", err)

}

client := config.Client(ctx)

srv, err := drive.New(client)

if err != nil {

log.Fatalf("Unable to retrieve Drive client: %v", err)

}

fileName := "sample.pdf"

file, err := os.Open(fileName)

if err != nil {

log.Fatalf("Error opening file: %v", err)

}

defer file.Close()

driveFile := &drive.File{Name: fileName}

res, err := srv.Files.Create(driveFile).Media(file).Fields("id, thumbnailLink").Do()

if err != nil {

log.Fatalf("Could not create file: %v", err)

}

fmt.Printf("File ID: %s\n", res.Id)

fmt.Printf("File Content Link: %s\n", res.WebContentLink)

fmt.Printf("File Web Link: %s\n", res.WebViewLink)

fmt.Printf("Thumbnail Link: %s\n", res.ThumbnailLink)

}

get_file_info.go

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package main

import (

"context"

"fmt"

"io/ioutil"

"log"

"golang.org/x/oauth2/google"

"google.golang.org/api/drive/v3"

)

func main() {

ctx := context.Background()

b, err := ioutil.ReadFile("secret.json")

if err != nil {

log.Fatalf("Unable to read service account key file: %v", err)

}

config, err := google.JWTConfigFromJSON(b, drive.DriveScope)

if err != nil {

log.Fatalf("Unable to parse service account key file to config: %v", err)

}

client := config.Client(ctx)

srv, err := drive.New(client)

if err != nil {

log.Fatalf("Unable to retrieve Drive Client: %v", err)

}

fileId := "xxxxxxxxxxxxxxxxxxxxx"

file, err := srv.Files.Get(fileId).Fields("id, name, mimeType, size, createdTime, thumbnailLink, webContentLink, webViewLink").Do()

if err != nil {

log.Fatalf("Unable to retrieve file: %v", err)

}

fmt.Printf("File ID: %s\n", file.Id)

fmt.Printf("Name: %s\n", file.Name)

fmt.Printf("MIME Type: %s\n", file.MimeType)

fmt.Printf("Size: %s bytes\n", file.Size)

fmt.Printf("Created Time: %s\n", file.CreatedTime)

fmt.Printf("File Content Link: %s\n", file.WebContentLink)

fmt.Printf("File Web Link: %s\n", file.WebViewLink)

fmt.Printf("Thumbnail Link: %s\n", file.ThumbnailLink)

}

 Thank you in advance.