remove all

internal/auth/claude/pkce.go

@@ -1,56 +0,0 @@
-// Package claude provides authentication and token management functionality
-// for Anthropic's Claude AI services. It handles OAuth2 token storage, serialization,
-// and retrieval for maintaining authenticated sessions with the Claude API.
-package claude
-
-import (
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/base64"
-	"fmt"
-)
-
-// GeneratePKCECodes generates a PKCE code verifier and challenge pair
-// following RFC 7636 specifications for OAuth 2.0 PKCE extension.
-// This provides additional security for the OAuth flow by ensuring that
-// only the client that initiated the request can exchange the authorization code.
-//
-// Returns:
-//   - *PKCECodes: A struct containing the code verifier and challenge
-//   - error: An error if the generation fails, nil otherwise
-func GeneratePKCECodes() (*PKCECodes, error) {
-	// Generate code verifier: 43-128 characters, URL-safe
-	codeVerifier, err := generateCodeVerifier()
-	if err != nil {
-		return nil, fmt.Errorf("failed to generate code verifier: %w", err)
-	}
-
-	// Generate code challenge using S256 method
-	codeChallenge := generateCodeChallenge(codeVerifier)
-
-	return &PKCECodes{
-		CodeVerifier:  codeVerifier,
-		CodeChallenge: codeChallenge,
-	}, nil
-}
-
-// generateCodeVerifier creates a cryptographically random string
-// of 128 characters using URL-safe base64 encoding
-func generateCodeVerifier() (string, error) {
-	// Generate 96 random bytes (will result in 128 base64 characters)
-	bytes := make([]byte, 96)
-	_, err := rand.Read(bytes)
-	if err != nil {
-		return "", fmt.Errorf("failed to generate random bytes: %w", err)
-	}
-
-	// Encode to URL-safe base64 without padding
-	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(bytes), nil
-}
-
-// generateCodeChallenge creates a SHA256 hash of the code verifier
-// and encodes it using URL-safe base64 encoding without padding
-func generateCodeChallenge(codeVerifier string) string {
-	hash := sha256.Sum256([]byte(codeVerifier))
-	return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(hash[:])
-}