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deviceauth.go
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deviceauth.go
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package login
import (
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"os"
"time"
"github.com/briandowns/spinner"
"github.com/fatih/color"
"encr.dev/cli/cmd/encore/cmdutil"
"encr.dev/cli/internal/browser"
"encr.dev/cli/internal/platform"
"encr.dev/internal/conf"
"encr.dev/internal/env"
)
// DeviceAuth logs in the suser with the device auth flow.
func DeviceAuth() (*conf.Config, error) {
// Generate PKCE challenge.
randData, err := genRandData()
if err != nil {
return nil, fmt.Errorf("could not generate random data: %v", err)
}
codeVerifier := base64.RawURLEncoding.EncodeToString([]byte(randData))
challengeHash := sha256.Sum256([]byte(codeVerifier))
codeChallenge := base64.RawURLEncoding.EncodeToString(challengeHash[:])
resp, err := platform.BeginDeviceAuthFlow(context.Background(), platform.BeginAuthorizationFlowParams{
CodeChallenge: codeChallenge,
ClientID: "encore_cli",
})
if err != nil {
return nil, err
}
var (
bold = color.New(color.Bold)
faint = color.New(color.Faint)
)
fmt.Printf("Your pairing code is %s\n", bold.Sprint(resp.UserCode))
faint.Println("This pairing code verifies your authentication with Encore.")
inputCh := make(chan struct{}, 1)
spin := spinner.New(spinner.CharSets[14], 100*time.Millisecond)
spin.Prefix = "Waiting for login confirmation..."
if !env.IsSSH() && browser.CanOpen() {
fmt.Fprintf(os.Stdout, "Press Enter to open the browser or visit %s (^C to quit)\n",
resp.VerificationURI)
// Asynchronously wait for input.
w := waitForEnterPress()
defer w.Stop()
go func() {
select {
case <-w.pressed:
inputCh <- struct{}{}
case <-w.quit:
}
}()
} else {
// On Windows we need a proper \r\n newline to ensure the URL detection doesn't extend to the next line.
// fmt.Fprintln and family prints just a simple \n, so don't use that.
fmt.Fprintf(os.Stdout, "To authenticate with Encore, please go to: %s%s", resp.VerificationURI, cmdutil.Newline)
spin.Start()
}
resultCh := make(chan deviceAuthResult, 1)
go pollForDeviceAuthResult(codeVerifier, resp, resultCh)
for {
select {
case <-inputCh:
// The user hit Enter; show a spinner and try to open the browser.
spin.Start()
if !browser.Open(resp.VerificationURI) {
spin.FinalMSG = fmt.Sprintf("Failed to open browser, please go to %s manually.", resp.VerificationURI)
spin.Stop()
// Create a new spinner so the message above stays around.
spin = spinner.New(spinner.CharSets[14], 100*time.Millisecond)
spin.Prefix = "Waiting for login confirmation..."
spin.Start()
}
case res := <-resultCh:
if res.err != nil {
spin.FinalMSG = fmt.Sprintf("Failed to log in: %v", res.err)
spin.Stop()
return nil, res.err
}
spin.Stop()
return res.cfg, nil
}
}
}
type deviceAuthResult struct {
cfg *conf.Config
err error
}
func pollForDeviceAuthResult(codeVerifier string, data *platform.BeginAuthorizationFlowResponse, resultCh chan<- deviceAuthResult) {
PollLoop:
for {
interval := data.Interval
if interval <= 0 {
interval = 5
}
time.Sleep(time.Duration(interval) * time.Second)
resp, err := platform.PollDeviceAuthFlow(context.Background(), platform.PollDeviceAuthFlowParams{
DeviceCode: data.DeviceCode,
CodeVerifier: codeVerifier,
})
if err != nil {
if e, ok := err.(platform.Error); ok {
switch e.Code {
case "auth_pending":
// Not yet authorized, continue polling.
continue PollLoop
case "rate_limited":
// Spurious error; sleep a bit extra before retrying to be safe.
time.Sleep(5 * time.Second)
continue PollLoop
}
}
resultCh <- deviceAuthResult{err: err}
return
}
cfg := &conf.Config{Token: *resp.Token, Actor: resp.Actor, Email: resp.Email, AppSlug: resp.AppSlug}
resultCh <- deviceAuthResult{cfg: cfg}
return
}
}
type enterPressWaiter struct {
quit chan struct{} // close to abort the waiter
pressed chan struct{} // closed when enter has been pressed
runDone chan struct{} // closed when the run goroutine has exited
}
func waitForEnterPress() *enterPressWaiter {
w := &enterPressWaiter{
quit: make(chan struct{}),
pressed: make(chan struct{}, 1),
runDone: make(chan struct{}),
}
go w.run()
return w
}
func (w *enterPressWaiter) run() {
defer close(w.runDone)
fmt.Fscanln(os.Stdin)
select {
case w.pressed <- struct{}{}:
case <-w.quit:
}
}
func (w *enterPressWaiter) Stop() {
close(w.quit)
os.Stdin.SetReadDeadline(time.Now()) // interrupt the pending read
// Asynchronously wait for the run goroutine to exit before
// we reset the read deadline.
go func() {
<-w.runDone
os.Stdin.SetReadDeadline(time.Time{}) // reset read deadline
}()
}