How to upload files to GoogleDrive, and share with anyone using ServiceAccount and Golang

I want to upload the file and share it with anyone from ServiceAccount Golang to GoogleDrive. But I am stuck in with this error.

• My Code:

package main

import (
	"fmt"
	"golang.org/x/net/context"
	"google.golang.org/api/drive/v3"
	"google.golang.org/api/googleapi"
	"google.golang.org/api/option"
	"log"
	"os"
)

func main() {
	srv, err := drive.NewService(context.Background(), option.WithCredentialsFile("key.json"))
	if err != nil {
		log.Fatal("Unable to access Drive API:", err)
	}

	filename := "./lemon.txt"
	file, err := os.Open(filename)
	if err != nil {
		log.Fatalln(err)
	}

	stat, err := file.Stat()
	if err != nil {
		log.Fatalln(err)
	}
	defer file.Close()

	res, err := srv.Files.Create(
		&drive.File{
			Parents: []string{"17n-EpJcGg0DmmWqSoJ75iIUdXDP7neoH"},
			Name:    "banana.txt",
			Permissions: []*drive.Permission{
				{
					Role: "reader",
					Type: "anyone",
				},
			},
		},
	).Media(file, googleapi.ChunkSize(int(stat.Size()))).Do()
	if err != nil {
		log.Fatalln(err)
	}
	
	fmt.Printf("%s\n", res.Id)
}

• Error:
  [Get 403][1]
  [1]: https://i.stack.imgur.com/mzwxv.png

When I saw your script, it seems that when a text file is uploaded, the permission data is included in the metadata. Unfortunately, this cannot be used. I think that this is the reason for your issue related to writable. In this case, after the file was uploaded, please use "Permissions: create". When your script is modified, how about the following modification?

From:

res, err := srv.Files.Create(
    &drive.File{
        Parents: []string{"17n-EpJcGg0DmmWqSoJ75iIUdXDP7neoH"},
        Name:    "banana.txt",
        Permissions: []*drive.Permission{
            {
                Role: "reader",
                Type: "anyone",
            },
        },
    },
).Media(file, googleapi.ChunkSize(int(stat.Size()))).Do()
if err != nil {
    log.Fatalln(err)
}

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

To:

res, err := srv.Files.Create(
	&drive.File{
		Parents: []string{"17n-EpJcGg0DmmWqSoJ75iIUdXDP7neoH"},
		Name:    "banana.txt",
	},
).Media(file, googleapi.ChunkSize(int(stat.Size()))).Do()
if err != nil {
	log.Fatalln(err)
}
fmt.Printf("%s\n", res.Id)

res2, err := srv.Permissions.Create(res.Id, &drive.Permission{
	Role: "reader",
	Type: "anyone",
}).Do()

• By this modification, the uploaded text file is publicly shared.

Note:

• From your comment of I already share my parent_id folder (the folder I want to upload files and share with anyone) with the service_account email as editor permission., if you want to upload a text file to the publicly shared folder "17n-EpJcGg0DmmWqSoJ75iIUdXDP7neoH", I think that the following modified script can be also used. Because, in this case, when a text file is uploaded to the publicly shared folder, the uploaded text file has the same permissions as the folder.

    res, err := srv.Files.Create(
    	&drive.File{
    		Parents: []string{"17n-EpJcGg0DmmWqSoJ75iIUdXDP7neoH"},
    		Name:    "banana.txt",
    	},
    ).Media(file, googleapi.ChunkSize(int(stat.Size()))).Do()
    if err != nil {
    	log.Fatalln(err)
    }
    fmt.Printf("%s\n", res.Id)
  

Reference:

• Permissions: create