Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Sheets API: Simplify quickstart code by using option.WithCredentialsFile(). #49

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Sheets API: Simplify quickstart code by using option.WithCredentialsFile(). #49

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
87 changes: 13 additions & 74 deletions sheets/quickstart/quickstart.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,88 +18,27 @@
package main

import (
"encoding/json"
"context"
"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/option"
"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)
}
ctx := context.Background()

// 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.NewService(ctx,
// Authenticate with a service account or refresh token JSON credentials file.
// Remove this option to authenticate via Application Default Credentials.
option.WithCredentialsFile("credentials.json"),

srv, err := sheets.New(client)
// Be default, the sheets package requests all scopes that it could
// potentially need. This passes the read-only scope explicitly to
// limit the requested scopes to what is actually needed.
option.WithScopes(sheets.SpreadsheetsReadonlyScope),
)
if err != nil {
log.Fatalf("Unable to retrieve Sheets client: %v", err)
}
Expand All @@ -108,7 +47,7 @@ func main() {
// https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit
spreadsheetId := "1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms"
readRange := "Class Data!A2:E"
resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).Do()
resp, err := srv.Spreadsheets.Values.Get(spreadsheetId, readRange).Context(ctx).Do()
if err != nil {
log.Fatalf("Unable to retrieve data from sheet: %v", err)
}
Expand Down