first-step-to-gsheet.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"golang.org/x/net/context"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	"google.golang.org/api/sheets/v4"
)

// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config) *http.Client {
	// The file token.json stores the user's access and refresh tokens, and is
	// created automatically when the authorization flow completes for the first
	// time.
	tokFile := "token.json"
	tok, err := tokenFromFile(tokFile)
	if err != nil {
		tok = getTokenFromWeb(config)
		saveToken(tokFile, tok)
	}
	return config.Client(context.Background(), tok)
}

// Request a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
	authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
	fmt.Printf("Go to the following link in your browser then type the "+
		"authorization code: \n%v\n", authURL)

	var authCode string
	if _, err := fmt.Scan(&authCode); err != nil {
		log.Fatalf("Unable to read authorization code: %v", err)
	}

	tok, err := config.Exchange(context.TODO(), authCode)
	if err != nil {
		log.Fatalf("Unable to retrieve token from web: %v", err)
	}
	return tok
}

// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
	f, err := os.Open(file)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	tok := &oauth2.Token{}
	err = json.NewDecoder(f).Decode(tok)
	return tok, err
}

// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
	fmt.Printf("Saving credential file to: %s\n", path)
	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
	if err != nil {
		log.Fatalf("Unable to cache oauth token: %v", err)
	}
	defer f.Close()
	json.NewEncoder(f).Encode(token)
}

// Create a struct to store our rows

// type Entry struct {
//      ID int `json:"id"`
//      Title string `json:"title"`
//      Date string `json:"date"`
// }

func main() {

	// I had to use a Service Account to build my app
	b, err := ioutil.ReadFile("<CREDENTIALS FROM GCP GSHEET SERVICE ACCOUNT.json>")
	if err != nil {
		log.Fatalf("Unable to read client secret file: %v", err)
	}

	// If modifying these scopes, delete your previously saved token.json.

	config, err := google.JWTConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets")
	if err != nil {
		log.Fatalf("Unable to parse client secret file to config: %v", err)
	}
	client := config.Client(oauth2.NoContext)

	spreadsheetId := "<ID HERE>"
	//readRange := "Sheet1!A2:B5"

	srv, err := sheets.New(client)
	if err != nil {
		log.Fatalf("Unable to retrieve Sheets client: %v", err)
	}

	// Modify this to your Needs
	rangeData := "sheet1!A1:E"
	rb := &sheets.BatchUpdateValuesRequest{
		ValueInputOption: "USER_ENTERED",
	}
	
	rows := make([][]interface{},0)
  
  rows = append(rows,[]interface{}{"Last Updated","Title","Article"})

	rb.Data = append(rb.Data, &sheets.ValueRange{
		Range:  rangeData,
		Values: rows,
	})
	// Do a batch update at once
	
	_, err = srv.Spreadsheets.Values.BatchUpdate(spreadsheetId, rb).Do()
	if err != nil {
	log.Fatal(err)
	
	

}