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auth.go
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auth.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"github.com/skratchdot/open-golang/open"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/calendar/v3"
)
func getClient(opts *options) {
l := func(s string, args ...interface{}) {
if opts.debug != nil {
opts.debug.Printf(s, args...)
}
}
l("Reading app credentials from $HOME/credentials.json")
home, err := os.UserHomeDir()
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
b, err := ioutil.ReadFile(filepath.Join(home, "credentials.json"))
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
l("Parsing app credentials")
config, err := google.ConfigFromJSON(b, calendar.CalendarEventsScope, calendar.CalendarReadonlyScope)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
tokFile := filepath.Join(home, ".gcal-purge")
tok, err := tokenFromFile(*opts, tokFile)
if err != nil {
tok = getTokenFromWeb(*opts, config)
saveToken(*opts, tokFile, tok)
}
opts.client = config.Client(context.Background(), tok)
}
func getTokenFromWeb(opts options, config *oauth2.Config) *oauth2.Token {
l := func(s string, args ...interface{}) {
if opts.debug != nil {
opts.debug.Printf(s, args...)
}
}
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
l("Opening %s in a browser", authURL)
open.Start(authURL)
fmt.Printf("Go here if it did not automatically launch in your browser: \n\t%s", authURL)
fmt.Print("\n\nPaste authorization code here: ")
var authCode string
if _, err := fmt.Scan(&authCode); err != nil {
log.Fatalf("Unable to read authorization code: %v", err)
}
l("Getting access token from authorization code")
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(opts options, file string) (*oauth2.Token, error) {
l := func(s string, args ...interface{}) {
if opts.debug != nil {
opts.debug.Printf(s, args...)
}
}
l("Getting token from %s", file)
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
tok := &oauth2.Token{}
err = json.NewDecoder(f).Decode(tok)
if err != nil {
return nil, err
}
return tok, err
}
// Saves a token to a file path.
func saveToken(opts options, path string, token *oauth2.Token) {
l := func(s string, args ...interface{}) {
if opts.debug != nil {
opts.debug.Printf(s, args...)
}
}
l("Saving token 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)
}