|
| 1 | +from __future__ import annotations |
| 2 | + |
| 3 | +import asyncio |
| 4 | +import base64 |
| 5 | +import hashlib |
| 6 | +import json |
| 7 | +import os |
| 8 | +import secrets |
| 9 | +import webbrowser |
| 10 | +from dataclasses import dataclass |
| 11 | +from http.server import BaseHTTPRequestHandler, HTTPServer |
| 12 | +from pathlib import Path |
| 13 | +from threading import Thread |
| 14 | +from typing import Any |
| 15 | +from urllib.parse import parse_qs, urlparse |
| 16 | + |
| 17 | +import httpx |
| 18 | + |
| 19 | +CONFIG_DIR = Path.home() / ".null" |
| 20 | +OAUTH_TOKENS_FILE = CONFIG_DIR / "oauth_tokens.json" |
| 21 | + |
| 22 | + |
| 23 | +@dataclass |
| 24 | +class OAuthTokens: |
| 25 | + access_token: str |
| 26 | + refresh_token: str |
| 27 | + expires_at: float |
| 28 | + provider: str |
| 29 | + |
| 30 | + def is_expired(self) -> bool: |
| 31 | + import time |
| 32 | + |
| 33 | + return time.time() >= self.expires_at - 60 |
| 34 | + |
| 35 | + def to_dict(self) -> dict[str, Any]: |
| 36 | + return { |
| 37 | + "access_token": self.access_token, |
| 38 | + "refresh_token": self.refresh_token, |
| 39 | + "expires_at": self.expires_at, |
| 40 | + "provider": self.provider, |
| 41 | + } |
| 42 | + |
| 43 | + @classmethod |
| 44 | + def from_dict(cls, data: dict[str, Any]) -> OAuthTokens: |
| 45 | + return cls( |
| 46 | + access_token=data["access_token"], |
| 47 | + refresh_token=data["refresh_token"], |
| 48 | + expires_at=data["expires_at"], |
| 49 | + provider=data["provider"], |
| 50 | + ) |
| 51 | + |
| 52 | + |
| 53 | +class PKCEHelper: |
| 54 | + @staticmethod |
| 55 | + def generate() -> tuple[str, str]: |
| 56 | + verifier = secrets.token_urlsafe(32) |
| 57 | + challenge = ( |
| 58 | + base64.urlsafe_b64encode(hashlib.sha256(verifier.encode()).digest()) |
| 59 | + .rstrip(b"=") |
| 60 | + .decode() |
| 61 | + ) |
| 62 | + return verifier, challenge |
| 63 | + |
| 64 | + |
| 65 | +class OAuthCallbackHandler(BaseHTTPRequestHandler): |
| 66 | + auth_code: str | None = None |
| 67 | + state: str | None = None |
| 68 | + error: str | None = None |
| 69 | + |
| 70 | + def log_message(self, format: str, *args: Any) -> None: |
| 71 | + pass |
| 72 | + |
| 73 | + def do_GET(self) -> None: |
| 74 | + parsed = urlparse(self.path) |
| 75 | + params = parse_qs(parsed.query) |
| 76 | + |
| 77 | + if "error" in params: |
| 78 | + OAuthCallbackHandler.error = params["error"][0] |
| 79 | + elif "code" in params: |
| 80 | + OAuthCallbackHandler.auth_code = params["code"][0] |
| 81 | + OAuthCallbackHandler.state = params.get("state", [None])[0] |
| 82 | + |
| 83 | + self.send_response(200) |
| 84 | + self.send_header("Content-type", "text/html") |
| 85 | + self.end_headers() |
| 86 | + |
| 87 | + if OAuthCallbackHandler.error: |
| 88 | + html = "<html><body><h1>Authentication Failed</h1><p>You can close this window.</p></body></html>" |
| 89 | + else: |
| 90 | + html = "<html><body><h1>Authentication Successful</h1><p>You can close this window and return to Null Terminal.</p></body></html>" |
| 91 | + self.wfile.write(html.encode()) |
| 92 | + |
| 93 | + |
| 94 | +class OAuthTokenStore: |
| 95 | + @staticmethod |
| 96 | + def save(tokens: OAuthTokens) -> None: |
| 97 | + CONFIG_DIR.mkdir(parents=True, exist_ok=True) |
| 98 | + |
| 99 | + all_tokens: dict[str, Any] = {} |
| 100 | + if OAUTH_TOKENS_FILE.exists(): |
| 101 | + try: |
| 102 | + all_tokens = json.loads(OAUTH_TOKENS_FILE.read_text()) |
| 103 | + except (json.JSONDecodeError, OSError): |
| 104 | + pass |
| 105 | + |
| 106 | + all_tokens[tokens.provider] = tokens.to_dict() |
| 107 | + OAUTH_TOKENS_FILE.write_text(json.dumps(all_tokens, indent=2)) |
| 108 | + |
| 109 | + @staticmethod |
| 110 | + def load(provider: str) -> OAuthTokens | None: |
| 111 | + if not OAUTH_TOKENS_FILE.exists(): |
| 112 | + return None |
| 113 | + |
| 114 | + try: |
| 115 | + all_tokens = json.loads(OAUTH_TOKENS_FILE.read_text()) |
| 116 | + if provider in all_tokens: |
| 117 | + return OAuthTokens.from_dict(all_tokens[provider]) |
| 118 | + except (json.JSONDecodeError, OSError, KeyError): |
| 119 | + pass |
| 120 | + |
| 121 | + return None |
| 122 | + |
| 123 | + @staticmethod |
| 124 | + def delete(provider: str) -> None: |
| 125 | + if not OAUTH_TOKENS_FILE.exists(): |
| 126 | + return |
| 127 | + |
| 128 | + try: |
| 129 | + all_tokens = json.loads(OAUTH_TOKENS_FILE.read_text()) |
| 130 | + if provider in all_tokens: |
| 131 | + del all_tokens[provider] |
| 132 | + OAUTH_TOKENS_FILE.write_text(json.dumps(all_tokens, indent=2)) |
| 133 | + except (json.JSONDecodeError, OSError): |
| 134 | + pass |
| 135 | + |
| 136 | + |
| 137 | +class BaseOAuthFlow: |
| 138 | + def __init__(self, callback_port: int = 51121): |
| 139 | + self.callback_port = callback_port |
| 140 | + self.callback_url = f"http://localhost:{callback_port}/oauth-callback" |
| 141 | + self._server: HTTPServer | None = None |
| 142 | + self._server_thread: Thread | None = None |
| 143 | + |
| 144 | + def _start_callback_server(self) -> None: |
| 145 | + OAuthCallbackHandler.auth_code = None |
| 146 | + OAuthCallbackHandler.state = None |
| 147 | + OAuthCallbackHandler.error = None |
| 148 | + |
| 149 | + self._server = HTTPServer( |
| 150 | + ("localhost", self.callback_port), OAuthCallbackHandler |
| 151 | + ) |
| 152 | + self._server_thread = Thread(target=self._server.handle_request, daemon=True) |
| 153 | + self._server_thread.start() |
| 154 | + |
| 155 | + def _wait_for_callback( |
| 156 | + self, timeout: float = 120 |
| 157 | + ) -> tuple[str | None, str | None, str | None]: |
| 158 | + if self._server_thread: |
| 159 | + self._server_thread.join(timeout=timeout) |
| 160 | + |
| 161 | + if self._server: |
| 162 | + self._server.server_close() |
| 163 | + |
| 164 | + return ( |
| 165 | + OAuthCallbackHandler.auth_code, |
| 166 | + OAuthCallbackHandler.state, |
| 167 | + OAuthCallbackHandler.error, |
| 168 | + ) |
| 169 | + |
| 170 | + def _open_browser(self, url: str) -> None: |
| 171 | + webbrowser.open(url) |
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