75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
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package main
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"os"
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"golang.org/x/net/context"
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"golang.org/x/oauth2"
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)
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// Retrieve a token, saves the token, then returns the generated client.
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func getClient(config *oauth2.Config) (*http.Client, error) {
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// The file token.json stores the user's access and refresh tokens, and is
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// created automatically when the authorization flow completes for the first
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// time.
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tokFile := "token.json"
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tok, err := tokenFromFile(tokFile)
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if err != nil {
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tok, err = getTokenFromWeb(config)
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if err != nil {
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return nil, err
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}
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err = saveToken(tokFile, tok)
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if err != nil {
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return nil, err
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}
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}
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return config.Client(context.Background(), tok), nil
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}
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// Request a token from the web, then returns the retrieved token.
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func getTokenFromWeb(config *oauth2.Config) (*oauth2.Token, error) {
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authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
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log.Printf("Go to the following link in your browser then type the authorization code: \n%v", authURL)
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var authCode string
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if _, err := fmt.Scan(&authCode); err != nil {
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return nil, err
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}
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tok, err := config.Exchange(context.TODO(), authCode)
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if err != nil {
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return nil, err
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}
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return tok, nil
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}
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// Retrieves a token from a local file.
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func tokenFromFile(file string) (*oauth2.Token, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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tok := &oauth2.Token{}
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err = json.NewDecoder(f).Decode(tok)
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return tok, err
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}
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// Saves a token to a file path.
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func saveToken(path string, token *oauth2.Token) error {
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f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer f.Close()
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json.NewEncoder(f).Encode(token)
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return nil
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}
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