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Initial work on login command (not yet working)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package login | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/debricked/cli/internal/login" | ||
| "github.com/fatih/color" | ||
| "github.com/spf13/cobra" | ||
| "github.com/spf13/viper" | ||
| ) | ||
|
|
||
| func NewLoginCmd(authenticator login.IAuthenticator) *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "login", | ||
| Short: "Authenticate debricked user", | ||
| Long: `Start authentication flow to generate access token.`, | ||
| PreRun: func(cmd *cobra.Command, _ []string) { | ||
| _ = viper.BindPFlags(cmd.Flags()) | ||
| }, | ||
| RunE: RunE(authenticator), | ||
| } | ||
|
|
||
| return cmd | ||
| } | ||
|
|
||
| func RunE(a login.IAuthenticator) func(_ *cobra.Command, args []string) error { | ||
| return func(cmd *cobra.Command, _ []string) error { | ||
| token, err := a.Authenticate() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf( | ||
| "%s Successfully authenticated\nToken=%s", | ||
| color.GreenString("✔"), | ||
| color.BlueString(token), | ||
| ) | ||
|
|
||
| return nil | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package login | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/sha256" | ||
| "encoding/base64" | ||
| "fmt" | ||
| "log" | ||
| "math/rand" | ||
| "net/http" | ||
| "os/exec" | ||
| "runtime" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "golang.org/x/oauth2" | ||
| ) | ||
|
|
||
| type IAuthenticator interface { | ||
| Authenticate() (string, error) | ||
| } | ||
|
|
||
| type Authenticator struct { | ||
| ClientID string | ||
| Scopes []string | ||
| } | ||
|
|
||
| const charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" | ||
|
|
||
| func generateRandomString(length int) string { | ||
| seed := rand.NewSource(time.Now().UnixNano()) | ||
| r := rand.New(seed) | ||
|
|
||
| b := make([]byte, length) | ||
| for i := range b { | ||
| b[i] = charset[r.Intn(len(charset))] | ||
| } | ||
| return string(b) | ||
| } | ||
|
|
||
| func createCodeChallenge(codeVerifier string) string { | ||
| // Create a SHA-256 hash of the code verifier | ||
| hash := sha256.Sum256([]byte(codeVerifier)) | ||
|
|
||
| // Encode the hash to base64 | ||
| encoded := base64.StdEncoding.EncodeToString(hash[:]) | ||
|
|
||
| // Make it URL safe | ||
| encoded = strings.TrimRight(encoded, "=") | ||
| encoded = strings.ReplaceAll(encoded, "+", "-") | ||
| encoded = strings.ReplaceAll(encoded, "/", "_") | ||
|
|
||
| return encoded | ||
| } | ||
|
|
||
| func (a Authenticator) Authenticate() (string, error) { | ||
| // Set up OAuth2 configuration | ||
| config := &oauth2.Config{ | ||
| ClientID: a.ClientID, | ||
| ClientSecret: "", | ||
| Endpoint: oauth2.Endpoint{ | ||
| AuthURL: "https://debricked.com/app/oauth/authorize", | ||
| TokenURL: "https://debricked.com/app/oauth/token", | ||
| }, | ||
| RedirectURL: "http://localhost:9096/callback", | ||
| Scopes: a.Scopes, | ||
| } | ||
|
|
||
| // Create a random state | ||
| state := generateRandomString(8) | ||
| codeVerifier := generateRandomString(64) | ||
|
|
||
| // Generate the authorization URL | ||
| authURL := config.AuthCodeURL( | ||
| state, | ||
| oauth2.SetAuthURLParam("code_challenge", createCodeChallenge(codeVerifier)), | ||
| oauth2.SetAuthURLParam("code_challenge_method", "S256"), | ||
| ) | ||
|
|
||
| // Start a temporary HTTP server to handle the callback | ||
| code := make(chan string) | ||
| defer close(code) | ||
| server := &http.Server{Addr: ":9096"} | ||
| // Start the server in a goroutine | ||
| go func() { | ||
| if err := server.ListenAndServe(); err != http.ErrServerClosed { | ||
| log.Fatalf("HTTP server error: %v", err) | ||
| } | ||
| }() | ||
|
|
||
| // Ensure the server is shut down when we're done | ||
| defer server.Shutdown(context.Background()) | ||
|
|
||
| // Open the browser for the user to log in | ||
| err := openBrowser(authURL) | ||
| if err != nil { | ||
| log.Fatal("Could not open browser:", err) | ||
| } | ||
|
|
||
| http.HandleFunc("/callback", func(w http.ResponseWriter, r *http.Request) { | ||
| if r.URL.Query().Get("state") != state { | ||
| http.Error(w, "Invalid state", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| code <- r.URL.Query().Get("code") | ||
| fmt.Fprintf(w, "Authentication successful! You can close this window now.") | ||
| }) | ||
|
|
||
| // Wait for the authorization code | ||
| authCode := <-code | ||
|
|
||
| // Exchange the authorization code for a token | ||
| token, err := config.Exchange(context.Background(), authCode) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return token.AccessToken, nil | ||
| } | ||
|
|
||
| func openBrowser(url string) error { | ||
| var cmd string | ||
| var args []string | ||
|
|
||
| switch runtime.GOOS { | ||
| case "windows": | ||
| cmd = "cmd" | ||
| args = []string{"/c", "start"} | ||
| case "darwin": | ||
| cmd = "open" | ||
| default: // "linux", "freebsd", "openbsd", "netbsd" | ||
| cmd = "xdg-open" | ||
| } | ||
| args = append(args, url) | ||
| return exec.Command(cmd, args...).Start() | ||
| } |
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