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token.go
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/
token.go
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package gmailext
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"github.com/notomo/gmailagg/pkg/httpext"
"golang.org/x/oauth2"
)
func Authorize(
ctx context.Context,
gmailCredentials string,
opener interface {
Open(context.Context, string) error
},
port uint,
baseTransport http.RoundTripper,
) (token *oauth2.Token, retErr error) {
config, err := getOauth2Config(ctx, gmailCredentials)
if err != nil {
return nil, fmt.Errorf("get oauth2 config: %w", err)
}
authCodeReceiver := make(chan string)
mux := http.NewServeMux()
mux.HandleFunc("/callback", func(w http.ResponseWriter, req *http.Request) {
// TODO: error handling
var authCode string
query := req.URL.Query()
code, ok := query["code"]
if ok && len(code) > 0 {
authCode = code[0]
}
w.WriteHeader(http.StatusOK)
if _, err := w.Write([]byte(`ok`)); err != nil {
retErr = errors.Join(retErr, err)
}
// TODO: redirect
authCodeReceiver <- authCode
})
url, server, listener, err := httpext.NewServer(mux, port)
if err != nil {
return nil, fmt.Errorf("new server: %w", err)
}
serveErr := make(chan error)
go func() {
serveErr <- server.Serve(listener)
}()
config.RedirectURL = url + "/callback"
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
if err := opener.Open(ctx, authURL); err != nil {
return nil, fmt.Errorf("browser open: %w", err)
}
var authCode string
select {
case authCode = <-authCodeReceiver:
case <-ctx.Done():
return nil, ctx.Err()
}
ctx = context.WithValue(ctx, oauth2.HTTPClient, &http.Client{
Timeout: 20 * time.Second,
Transport: baseTransport,
})
token, err = config.Exchange(ctx, authCode)
if err != nil {
return nil, fmt.Errorf("exchange: %w", err)
}
if err := server.Shutdown(ctx); err != nil {
return nil, fmt.Errorf("server shutdown: %w", err)
}
if err := <-serveErr; err != nil && !errors.Is(err, http.ErrServerClosed) {
return nil, err
}
return token, nil
}