Google Drive APIでアップロードしたファイルの公開範囲を変更する ref: http://qiita.com/deltam/items/e13479ef36ac6729063e

gdrive_permission.go

package main

import (
    "code.google.com/p/goauth2/oauth"
    "fmt"
    "google.golang.org/api/drive/v2"
    "log"
    "net/http"
    "os"
)

// Settings for authorization.
var config = &oauth.Config{
    ClientId:     "YOUR_CLIENT_ID",
    ClientSecret: "YOUR_CLIENT_SECRET",
    Scope:        "https://www.googleapis.com/auth/drive",
    RedirectURL:  "urn:ietf:wg:oauth:2.0:oob",
    AuthURL:      "https://accounts.google.com/o/oauth2/auth",
    TokenURL:     "https://accounts.google.com/o/oauth2/token",
    TokenCache:   oauth.CacheFile("cache.json"),
}

// Uploads a file to Google Drive
func main() {
    t := &oauth.Transport{
        Config:    config,
        Transport: http.DefaultTransport,
    }

    // キャッシュがあったらブラウザ認証しない
    _, err := config.TokenCache.Token()
    if err != nil {
        // Generate a URL to visit for authorization.
        authUrl := config.AuthCodeURL("state")
        log.Printf("Go to the following link in your browser: %v\n", authUrl)

        // Read the code, and exchange it for a token.
        log.Printf("Enter verification code: ")
        var code string
        fmt.Scanln(&code)
        _, err := t.Exchange(code)
        if err != nil {
            log.Fatalf("An error occurred exchanging the code: %v\n", err)
        }
    }

    // Create a new authorized Drive client.
    svc, err := drive.New(t.Client())
    if err != nil {
        log.Fatalf("An error occurred creating Drive client: %v\n", err)
    }

    // Define the metadata for the file we are going to create.
    f := &drive.File{
        Title:       "My Document",
        Description: "My test document",
    }

    // Read the file data that we are going to upload.
    m, err := os.Open("document.txt")
    if err != nil {
        log.Fatalf("An error occurred reading the document: %v\n", err)
    }

    // Make the API request to upload metadata and file data.
    r, err := svc.Files.Insert(f).Media(m).Do()
    if err != nil {
        log.Fatalf("An error occurred uploading the document: %v\n", err)
    }
    log.Printf("Created: ID=%v, Title=%v\n", r.Id, r.Title)


    // 公開範囲変更のために追加したコード
    pm := &drive.Permission{
        Type:  "domain",
        Role:  "reader", // 閲覧者設定
        Value: "{GoogleAppsのドメイン}",
    }

    // SendNotificationEmails(false)にしないとスクリプト実行のたびにメールが飛んでしまう（？
    rpm, err := svc.Permissions.Insert(r.Id, pm).SendNotificationEmails(false).Do()
    if err != nil {
        log.Fatalf("Permission error : %v\n", err)
    }
    log.Printf("Permission: type:%v, role:%v\n", rpm.Type, rpm.Role)
}