109 lines
2.4 KiB
Go
109 lines
2.4 KiB
Go
package cmd
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import (
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"bufio"
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"context"
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"errors"
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"fmt"
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"os"
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"strings"
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"github.com/mathismqn/godeez/internal/deezer"
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"github.com/spf13/cobra"
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"golang.org/x/term"
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)
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func newLoginCmd() *cobra.Command {
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return &cobra.Command{
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Use: "login",
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Short: "Log in to Deezer with your email and password",
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Args: cobra.NoArgs,
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RunE: func(cmd *cobra.Command, args []string) error {
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if err := deezer.CheckGatewayEnv(); err != nil {
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return err
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}
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err := runLogin(cmd.Context())
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if errors.Is(err, context.Canceled) {
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return nil
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}
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return err
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},
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}
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}
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func runLogin(ctx context.Context) error {
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email, password, err := promptCredentials(ctx)
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if err != nil {
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return err
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}
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_, username, err := deezer.Login(ctx, email, password)
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if err != nil {
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return err
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}
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fmt.Printf("Successfully logged in as %s.\n", username)
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return nil
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}
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// promptCredentials reads the email and password, giving up if ctx is
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// cancelled.
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//
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// Reading stdin cannot itself be cancelled, so the read runs in a goroutine
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// and this selects on whichever finishes first. That goroutine outlives a
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// cancelled prompt, which is why the channel is buffered.
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//
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// Terminal state is captured up front and restored on cancellation: Ctrl-C
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// during the password prompt would otherwise leave echo disabled and the
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// user's shell silently typing blind.
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func promptCredentials(ctx context.Context) (string, string, error) {
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oldState, stateErr := term.GetState(int(os.Stdin.Fd()))
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type credentials struct {
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email string
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password string
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err error
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}
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resultChan := make(chan credentials, 1)
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go func() {
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var c credentials
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c.email, c.password, c.err = readCredentials()
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resultChan <- c
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}()
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select {
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case c := <-resultChan:
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return c.email, c.password, c.err
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case <-ctx.Done():
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if stateErr == nil {
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term.Restore(int(os.Stdin.Fd()), oldState)
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}
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fmt.Println()
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return "", "", ctx.Err()
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}
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}
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// readCredentials prompts on the terminal. The password is read with echo
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// off so it neither appears on screen nor reaches the shell history.
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func readCredentials() (string, string, error) {
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fmt.Print("Email: ")
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line, err := bufio.NewReader(os.Stdin).ReadString('\n')
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if err != nil {
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return "", "", err
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}
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email := strings.TrimSpace(line)
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fmt.Print("Password: ")
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passwordBytes, err := term.ReadPassword(int(os.Stdin.Fd()))
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fmt.Println()
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if err != nil {
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return "", "", err
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}
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return email, string(passwordBytes), nil
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}
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