Implement Oauth

.gitignore

@@ -1 +1,2 @@
 bin/
+logs/app.log

cli/cmd/auth_login.go

@@ -2,34 +2,57 @@ package cmd
 
 import (
 	"bufio"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"io"
+	"net/http"
+	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
 )
 
-// TODO: Update with real auth URL
-const authUrl = "https://example.com/login"
+const (
+	serverBaseUrl = "http://localhost:3000"
+	authUrl       = serverBaseUrl + "/oauth/authorize"
+	tokenUrl      = serverBaseUrl + "/oauth/token"
+	clientID      = "cli"
+	redirectURI   = serverBaseUrl + "/oauth/callback"
+)
 
 type LoginCmd struct {
 }
 
-func openUrl() error {
+func generateRandomString(n int) (string, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+func generateCodeChallenge(verifier string) string {
+	s := sha256.New()
+	s.Write([]byte(verifier))
+	return base64.RawURLEncoding.EncodeToString(s.Sum(nil))
+}
 
+func openUrl(url string) error {
 	var cmd *exec.Cmd
-	url := authUrl
 	switch runtime.GOOS {
 	case "darwin":
 		cmd = exec.Command("open", url)
 	case "windows":
 		cmd = exec.Command("rundll32", "url.dll,FileProtocolHandler", url)
-	default: // Linux, BSD, etc.
+	default: // Linux
 		cmd = exec.Command("xdg-open", url)
 	}
-
 	return cmd.Start()
 }
 
@@ -51,59 +74,68 @@ func saveTokenToConfig(ctx *AppContext, token string) error {
 	if err := os.WriteFile(configPath, data, 0o600); err != nil {
 		return fmt.Errorf("failed to write config file: %w", err)
 	}
-	fmt.Println("Token saved:", token)
+	fmt.Println("Token saved")
 	return nil
 }
 
-func getLongLivedToken(shortLivedToken string) (string, error) {
-	// Placeholder for actual implementation to exchange short-lived token for long-lived token
-	// In a real scenario, this would involve making an HTTP request to the auth server
-	return shortLivedToken + "_long_lived", nil
-}
-
 func (l *LoginCmd) Run(ctx *AppContext) error {
-	// mist auth login
-	if ctx.Config != nil && ctx.Config.AccessToken != "" {
-
-		// Already logged in, ask if they want to re-login
-		fmt.Println("Already logged in with token:", ctx.Config.AccessToken)
-		fmt.Print("Re-enter token? (y/N): ")
-		reader := bufio.NewReader(os.Stdin)
-		answer, _ := reader.ReadString('\n')
-		answer = strings.TrimSpace(strings.ToLower(answer))
-		if answer != "y" && answer != "yes" {
-			fmt.Println("Aborting login.")
-			return nil
-		}
+	verifier, err := generateRandomString(32)
+	if err != nil {
+		return fmt.Errorf("failed to generate verifier: %w", err)
 	}
+	challenge := generateCodeChallenge(verifier)
 
-	fmt.Println("Opening browser for authentication...")
-	fmt.Printf("If your browser didn't open, click here: \033]8;;%s\033\\%s\033]8;;\033\\\n", authUrl, authUrl)
+	u, _ := url.Parse(authUrl)
+	q := u.Query()
+	q.Set("client_id", clientID)
+	q.Set("response_type", "code")
+	q.Set("redirect_uri", redirectURI)
+	q.Set("code_challenge", challenge)
+	q.Set("code_challenge_method", "S256")
+	u.RawQuery = q.Encode()
 
-	err := openUrl()
-	if err != nil {
-		fmt.Println("Error opening browser:", err)
-		return err
+	fmt.Printf("If your browser doesn't open, visit: %s\n", u.String())
+
+	if err := openUrl(u.String()); err != nil {
+		fmt.Printf("Failed to open browser: %v\n", err)
 	}
-	fmt.Print("token: ")
 
+	fmt.Print("Enter the authorization code: ")
 	reader := bufio.NewReader(os.Stdin)
-	token, _ := reader.ReadString('\n')
-	token = strings.TrimSpace(token)
+	code, _ := reader.ReadString('\n')
+	code = strings.TrimSpace(code)
 
-	token, err = getLongLivedToken(token)
-	if err != nil {
-		fmt.Println("Error obtaining long-lived token:", err)
-		return err
+	if code == "" {
+		return fmt.Errorf("authorization code is required")
 	}
 
-	err = saveTokenToConfig(ctx, token)
+	data := url.Values{}
+	data.Set("grant_type", "authorization_code")
+	data.Set("client_id", clientID)
+	data.Set("code", code)
+	data.Set("redirect_uri", redirectURI)
+	data.Set("code_verifier", verifier)
+
+	resp, err := http.PostForm(tokenUrl, data)
 	if err != nil {
-		fmt.Println("Error during token saving")
-		return err
+		return fmt.Errorf("failed to exchange token: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("token exchange failed: %s", body)
 	}
 
-	fmt.Println("Saved token to config")
+	var tokenResp map[string]interface{}
+	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
+		return fmt.Errorf("failed to decode token response: %w", err)
+	}
 
-	return nil
+	accessToken, ok := tokenResp["access_token"].(string)
+	if !ok {
+		return fmt.Errorf("invalid token response: missing access_token")
+	}
+
+	return saveTokenToConfig(ctx, accessToken)
 }