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351 lines (302 loc) · 12.7 KB
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"""Shared writer for the Databricks bearer-token helper script.
Claude Code (via ``apiKeyHelper`` in settings.json), Pi (via a
``!command`` apiKey in models.json), and Gemini CLI (via CoDA's launcher
wrapper) resolve their model-auth token by running this helper *per request / per TTL*. Centralising the writer keeps a single
source of truth for the token-resolution logic and its interpreter wiring, so
the two agents can never drift apart.
The helper prints exactly one line to stdout: the bearer token. Resolution
order (see the emitted script's docstring for the full rationale):
1. SP OAuth token fetched from the loopback broker (host path).
2. Legacy ``omnigents-host`` M2M profile, for upgrades from older containers.
3. The PAT from ``$DATABRICKS_TOKEN`` or ``~/.databrickscfg`` [DEFAULT].
All are resolved fresh on each invocation, so a long-running agent survives
PAT rotation / SP-OAuth expiry without a restart.
"""
import configparser
import json
import os
import sys
from pathlib import Path
from sp_token_broker import fetch_sp_token
# Legacy SP OAuth profile name. New installs persist only a secret-free host
# pointer under this name and fetch bearers from the loopback broker.
SP_PROFILE = "omnigents-host"
def resolve_sp_oauth_token() -> str | None:
"""Resolve a fresh token from the Omnigent host M2M profile."""
broker_url = os.environ.get("CODA_SP_TOKEN_BROKER_URL", "").strip()
if broker_url:
token = fetch_sp_token(broker_url)
if token:
return token
# Do not let a missing legacy profile trigger the SDK's ambient auth
# discovery/network path. On local setup tests (and on a cold PAT-only
# container) there is no profile; return immediately so setup scripts can
# use DATABRICKS_TOKEN instead of hanging for an unavailable SP login.
cfg_path = Path(os.path.expanduser("~/.databrickscfg"))
try:
config = configparser.ConfigParser()
config.read(cfg_path)
if SP_PROFILE not in config:
return None
except Exception:
return None
try:
from databricks.sdk.core import Config
headers = Config(profile=SP_PROFILE).authenticate()
auth = (headers or {}).get("Authorization", "")
token = auth[7:].strip() if auth.startswith("Bearer ") else auth.strip()
if token:
return token
except Exception:
pass
return None
def resolve_databricks_token() -> str | None:
"""Resolve a fresh SP OAuth token, falling back to the current PAT."""
token = resolve_sp_oauth_token()
if token:
return token
token = os.environ.get("DATABRICKS_TOKEN", "").strip()
if token:
return token
try:
config = configparser.ConfigParser()
config.read(os.path.expanduser("~/.databrickscfg"))
return config.get("DEFAULT", "token", fallback="").strip() or None
except Exception:
return None
_HELPER_SRC = r'''#!/usr/bin/env python3
"""Print a Databricks bearer token for Claude Code / Pi / Gemini resolution.
stdout MUST be the token only -- both callers use it verbatim.
"""
import configparser
import os
import shutil
import subprocess
import sys
from urllib.parse import urlsplit
from urllib.request import HTTPRedirectHandler, build_opener
SP_PROFILE = "omnigents-host"
_MAX_TOKEN_BYTES = 16 * 1024
# Set on the uv re-run so the child (which has the SDK) doesn't recurse.
_REEXEC_GUARD = "OMNIGENTS_APIKEY_HELPER_REEXEC"
class _NoRedirectHandler(HTTPRedirectHandler):
def redirect_request(self, *_args, **_kwargs):
return None
_NO_REDIRECT_OPENER = build_opener(_NoRedirectHandler())
def urlopen(url, timeout):
return _NO_REDIRECT_OPENER.open(url, timeout=timeout)
def _broker_token():
url = os.environ.get("CODA_SP_TOKEN_BROKER_URL", "").strip()
try:
parsed = urlsplit(url)
valid = (
parsed.scheme == "http"
and parsed.hostname == "127.0.0.1"
and parsed.username is None
and parsed.password is None
and parsed.port is not None
and not parsed.query
and not parsed.fragment
and len(parsed.path.split("/")) == 3
and parsed.path.startswith("/token/")
and len(parsed.path.rsplit("/", 1)[1]) >= 32
)
except ValueError:
valid = False
if not valid:
return None
try:
with urlopen(url, timeout=5) as response:
content_type = (response.headers.get("Content-Type", "") or "").split(";", 1)[0]
body = response.read(_MAX_TOKEN_BYTES + 1)
if content_type.strip().lower() != "text/plain" or len(body) > _MAX_TOKEN_BYTES:
return None
token = body.decode("utf-8").strip()
return token if token and "\r" not in token and "\n" not in token else None
except Exception:
return None
def _sp_oauth_token():
token = _broker_token()
if token:
return token
# Upgrade fallback: mint via an older persisted M2M profile. New installs
# never write client_id/client_secret to terminal-visible HOME.
# The M2M (client_id/secret) profile the
# Omnigent host writes is NOT usable via `databricks auth token` (that CLI
# verb is U2M-only and refuses M2M); Config.authenticate() does the
# client-credentials flow. Verified accepted by /anthropic (C-O1, HTTP 200).
# Absent profile / non-host instance -> returns None, caller falls back.
try:
from databricks.sdk.core import Config
except ImportError:
# The helper is normally registered to run under the app's venv
# interpreter (which has databricks-sdk), so this branch shouldn't
# trigger. If it is ever invoked with a bare python3 that lacks the
# SDK, re-exec once under an interpreter that has it: prefer the
# recorded venv python (CODA_VENV_PYTHON), else fall back to
# `uv run --with databricks-sdk python`.
if os.environ.get(_REEXEC_GUARD) == "1":
return None
env = dict(os.environ, **{_REEXEC_GUARD: "1"})
try:
venv_python = os.environ.get("CODA_VENV_PYTHON")
if venv_python and os.path.exists(venv_python):
cmd = [venv_python, os.path.abspath(__file__)]
else:
uv = shutil.which("uv")
if not uv:
return None
cmd = [uv, "run", "--with", "databricks-sdk", "python",
os.path.abspath(__file__)]
out = subprocess.run(
cmd, env=env, capture_output=True, text=True, check=False,
)
except Exception:
return None
return (out.stdout or "").strip() or None
except Exception:
return None
try:
headers = Config(profile=SP_PROFILE).authenticate()
except Exception:
return None
auth = (headers or {}).get("Authorization", "")
# Strip the "Bearer " prefix so stdout carries the raw token only.
return auth[7:].strip() if auth.startswith("Bearer ") else (auth.strip() or None)
def _pat_token():
tok = os.environ.get("DATABRICKS_TOKEN", "").strip()
if tok:
return tok
cfg_path = os.path.expanduser("~/.databrickscfg")
try:
cp = configparser.ConfigParser()
cp.read(cfg_path)
return (cp["DEFAULT"].get("token") or "").strip() or None
except Exception:
return None
def main():
token = _sp_oauth_token() or _pat_token()
if not token:
print("no token source (no SP token broker, no PAT)", file=sys.stderr)
sys.exit(1)
sys.stdout.write(token)
if __name__ == "__main__":
main()
'''
def write_token_helper(target_dir) -> Path:
"""Write the executable token helper into ``target_dir``; return its path.
Idempotent: overwrites any prior copy so a version bump propagates. The
helper emits only the token on stdout (all diagnostics go to stderr).
"""
target_dir = Path(target_dir)
target_dir.mkdir(parents=True, exist_ok=True)
helper_path = target_dir / "anthropic-token-helper.py"
helper_path.write_text(_HELPER_SRC)
helper_path.chmod(0o700)
return helper_path
def helper_command(helper_path) -> str:
"""The `!command` string Pi uses to resolve its apiKey via the helper.
Runs the helper under the app's venv interpreter (has databricks-sdk) so it
never has to re-exec; falls back to the current interpreter. Pi resolves the
`!`-prefixed value as a shell command fresh per request.
"""
py = os.environ.get("CODA_VENV_PYTHON") or sys.executable or "python3"
return f"!{py} {helper_path}"
def write_databricks_token_wrapper(target_dir, real_cli: str) -> Path:
"""Write a narrow CLI shim for Omnigent's profile-based auth command."""
target_dir = Path(target_dir)
target_dir.mkdir(parents=True, exist_ok=True)
wrapper_path = target_dir / "databricks"
source = f'''#!{sys.executable}
import configparser
import datetime
import json
import os
import sys
from urllib.request import urlopen
REAL_CLI = {json.dumps(real_cli)}
PROFILE = {json.dumps(SP_PROFILE)}
def _profile(args):
for index, arg in enumerate(args):
if arg == "--profile" and index + 1 < len(args):
return args[index + 1]
if arg.startswith("--profile="):
return arg.split("=", 1)[1]
return None
def _broker_token():
url = os.environ.get("CODA_SP_TOKEN_BROKER_URL", "")
if not url:
return None
try:
with urlopen(url, timeout=5) as response:
token = response.read().decode().strip()
return token or None
except Exception:
return None
def _profile_host():
path = os.path.expanduser("~/.databrickscfg")
try:
cfg = configparser.ConfigParser(interpolation=None)
cfg.read(path)
return (cfg.get(PROFILE, "host", fallback="") or "").strip()
except Exception:
return ""
args = sys.argv[1:]
profile = _profile(args) or os.environ.get("DATABRICKS_CONFIG_PROFILE")
if args[:2] == ["auth", "token"] and _profile(args) == PROFILE:
token = _broker_token()
if not token:
os.execv(REAL_CLI, [REAL_CLI, *args])
# Emit the FULL OAuth token shape the databricks-sdk CLI token source
# (DatabricksCliTokenSource) requires: access_token + token_type + expiry.
# ALWAYS emit JSON — NOT gated on `--output json`. The SDK builds the token
# command as `databricks auth token --profile <p>` WITHOUT `--output json`
# (credentials_provider._build_core_cli_command) yet still json.loads()s the
# output, because the real CLI defaults `auth token` to JSON. A shim that
# printed a raw token on the no-flag path made the SDK fail with "cannot
# unmarshal CLI result: Expecting value: line 1 column 1", so
# Config(profile=...).authenticate() — used by omnigent's
# resolve_databricks_workspace for the model-catalog fetch — failed and pi
# fell back to a single-model picker. Match the real CLI: default to JSON.
#
# The broker returns only the raw token (no expiry metadata) and always
# mints a FRESH token per call. Set a short, conservative expiry (now + 5
# min, well inside the ~1h SP-OAuth TTL) so the SDK re-invokes this shim —
# re-hitting the broker for a fresh token — rather than caching one whose
# real lifetime we can't prove. Format matches CliTokenSource._parse_expiry
# ("%Y-%m-%dT%H:%M:%S", trailing Z ok).
expiry = (
datetime.datetime.now(datetime.timezone.utc)
+ datetime.timedelta(minutes=5)
).strftime("%Y-%m-%dT%H:%M:%SZ")
payload = {{
"access_token": token,
"token_type": "Bearer",
"expiry": expiry,
}}
# A bare `auth token` (no --output) also defaults to JSON on the real CLI,
# so emitting JSON unconditionally is faithful. `--output text` is not used
# by the SDK, so we don't special-case it.
print(json.dumps(payload))
raise SystemExit(0)
# Direct terminal commands (e.g. `databricks current-user me`) do not invoke
# the SDK's `auth token` subcommand, so they would otherwise reach the real CLI
# with the secret-free omnigents-host profile and fail looking for an OAuth
# cache. For that one profile, mint a broker token and hand it to the real CLI
# through process-local env vars. The token never enters the shell's exported
# environment or a file, and other profiles/commands are delegated untouched.
if profile == PROFILE:
token = _broker_token()
if token:
env = dict(os.environ)
env["DATABRICKS_TOKEN"] = token
host = _profile_host()
if host:
env["DATABRICKS_HOST"] = host
env.pop("DATABRICKS_CONFIG_PROFILE", None)
os.execve(REAL_CLI, [REAL_CLI, *args], env)
os.execv(REAL_CLI, [REAL_CLI, *args])
'''
wrapper_path.write_text(source)
wrapper_path.chmod(0o700)
return wrapper_path
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