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fix: preserve statsig config while using x1 prefix #568

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fix: preserve statsig config while using x1 prefix #568

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32 changes: 14 additions & 18 deletions app/dataplane/proxy/adapters/headers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@


from app.platform.logging.logger import logger
from app.platform.config.snapshot import get_config
from app.control.proxy.models import ProxyLease
from app.dataplane.proxy.adapters.profile import ProxyProfile, resolve_proxy_profile

Expand Down Expand Up @@ -64,24 +65,19 @@ def _sanitize(value: Optional[str], *, field: str, strip_spaces: bool = False) -


def _statsig_id() -> str:
"""Generate a Statsig evaluation fallback ID.

The real browser's fetch interceptor tries to evaluate Statsig gates for
each request. When the Statsig SDK is not yet initialised (headless,
first paint, etc.) it catches the error and falls back to::

btoa("x1:" + error.toString())

The server accepts this fallback. We reproduce the exact format with
varied error messages to avoid a static fingerprint.
"""
if random.choice((True, False)):
rand = "".join(random.choices(string.ascii_lowercase + string.digits, k=5))
msg = f"x1:TypeError: Cannot read properties of null (reading 'children[\\'{rand}\\']')"
else:
rand = "".join(random.choices(string.ascii_lowercase, k=10))
msg = f"x1:TypeError: Cannot read properties of undefined (reading '{rand}')"
return base64.b64encode(msg.encode()).decode()
cfg = get_config()
if cfg.get_bool("features.dynamic_statsig", False):
if random.choice((True, False)):
rand = "".join(random.choices(string.ascii_lowercase + string.digits, k=5))
msg = f"x1:TypeError: Cannot read properties of null (reading 'children['{rand}']')"
else:
rand = "".join(random.choices(string.ascii_lowercase, k=10))
msg = f"x1:TypeError: Cannot read properties of undefined (reading '{rand}')"
return base64.b64encode(msg.encode()).decode()
return (
"ZTpUeXBlRXJyb3I6IENhbm5vdCByZWFkIHByb3BlcnRpZXMgb2YgdW5kZWZpbmVkIChyZWFkaW5nICdjaGls"
"ZE5vZGVzJyk="
)


# ---------------------------------------------------------------------------
Expand Down