quickstart

https://developers.google.com/sheets/api/quickstart/go

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Vincent Batts 2020-10-19 13:38:43 -04:00
parent 1b48b3beed
commit c11fd878cd
Signed by: vbatts
GPG key ID: 10937E57733F1362

109
main.go Normal file
View file

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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)
}
func main() {
b, err := ioutil.ReadFile("credentials.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.ConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets.readonly")
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config)
srv, err := sheets.New(client)
if err != nil {
log.Fatalf("Unable to retrieve Sheets client: %v", err)
}
// Prints the names and majors of students in a sample spreadsheet:
// https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit
spreadsheetId := "1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms"
readRange := "Class Data!A2:E"
resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).Do()
if err != nil {
log.Fatalf("Unable to retrieve data from sheet: %v", err)
}
if len(resp.Values) == 0 {
fmt.Println("No data found.")
} else {
fmt.Println("Name, Major:")
for _, row := range resp.Values {
// Print columns A and E, which correspond to indices 0 and 4.
fmt.Printf("%s, %s\n", row[0], row[4])
}
}
}