atlas-backend

The official Python backend SDK for Atlas — a typed client over the sk_ Backend API (BAPI) and the psk_ Platform API. It is the Python peer of the TypeScript @atlasauth/backend SDK.

• Covers every Backend API and Platform API operation in the public API reference.
• Typed (py.typed): request bodies and responses are TypedDicts in atlas_backend.models, generated from the API reference.
• Sync AtlasClient and async AsyncAtlasClient, built on httpx; the platform-key surface is AtlasPlatformClient / AsyncAtlasPlatformClient.
• The { errors: [{ code, message, param }] } envelope surfaces as AtlasError, with every stable code on ErrorCode.
• Cursor pagination helpers, Idempotency-Key on creates, strict request bodies.
• Session-token, API-key and back-channel logout-token verification.

Install

pip install atlas-backend

Quick start

from atlas_backend import AtlasClient, AtlasError, paginate

atlas = AtlasClient("sk_live_...", base_url="https://api.atlasauth.net")

# Create a user (idempotency key optional, forwarded as Idempotency-Key).
user = atlas.users.create(
    {"email_address": "ada@example.com", "first_name": "Ada"},
    idempotency_key="signup-ada-001",
)
print(user["id"])

# List organizations (a single cursor page).
page = atlas.organizations.list(limit=20)
print(page["data"], page["has_more"], page["next_cursor"])

# Auto-iterate every page.
for org in paginate(atlas.organizations.list):
    print(org["name"])

# Errors carry the HTTP status and the stable BAPI error code.
try:
    atlas.users.get("user_does_not_exist")
except AtlasError as err:
    print(err.status)          # e.g. 404
    print(err.code)            # e.g. "NOT_FOUND"
    print(err.errors[0].get("param"))
    if err.has_code("NOT_FOUND"):
        ...

Context manager

with AtlasClient("sk_live_...") as atlas:
    atlas.users.list(limit=10)
# underlying httpx.Client is closed on exit

Async

import asyncio
from atlas_backend import AsyncAtlasClient, acollect

async def main() -> None:
    async with AsyncAtlasClient("sk_live_...") as atlas:
        user = await atlas.users.create({"email_address": "grace@example.com"})
        orgs = await acollect(atlas.organizations.list)
        print(user["id"], len(orgs))

asyncio.run(main())

Configuration

Argument	Default	Notes
secret_key	—	sk_...; sent as Authorization: Bearer <key>.
base_url	https://api.atlasauth.net	The instance's Backend API origin.
timeout	30.0	Per-request timeout, seconds.
http_client	a new httpx.Client	Pass your own for pooling / proxies / retries.
strict	None	True/False sends Atlas-Strict on every write (below).
on_unknown_fields	log a warning	Called with fields Atlas ignored on a write (below).

Strict request bodies

By default a write that includes a field the endpoint does not accept still succeeds; Atlas ignores the field and names it in the Atlas-Unknown-Fields response header. The SDK reports that header to you, so a typo never goes unnoticed:

def report(fields: list[str], method: str, path: str) -> None:
    print(f"Atlas ignored {fields} on {method} {path}")

atlas = AtlasClient("sk_live_...", on_unknown_fields=report)

Without a hook the SDK logs a warning on the atlas_backend logger.

To refuse unknown fields instead (422 with code UNKNOWN_FIELD, before anything changes), turn on strict mode for the whole client, or for one call:

from atlas_backend import AtlasClient, AtlasError, ErrorCode

atlas = AtlasClient("sk_live_...", strict=True)       # every write is strict

try:
    AtlasClient("sk_live_...").with_options(strict=True).users.update(
        "user_123", {"first_name": "Ada", "nickname": "ada"}
    )
except AtlasError as err:
    if err.has_code(ErrorCode.UNKNOWN_FIELD):
        print("unknown field:", err.errors[0].get("param"))

strict=False sends Atlas-Strict: false, opting a request out when your instance makes strict bodies the default. with_options(...) returns a copy that shares the connection; it works on every client class.

Platform client and Sign in with Atlas apps

A platform key (psk_...) manages the apps and instances your platform owns, and registers Sign in with Atlas apps (OpenID Connect clients on https://atlasauth.net):

from atlas_backend import AtlasPlatformClient

platform = AtlasPlatformClient("psk_live_...")

app = platform.atlas_id_apps.create(
    {
        "name": "Acme",
        "redirect_uris": ["https://acme.example/auth/callback"],
        "post_logout_redirect_uris": ["https://acme.example/"],
        "backchannel_logout_uri": "https://acme.example/auth/backchannel-logout",
        "backchannel_logout_session_required": True,
        "allowed_scopes": ["openid", "profile", "email"],
        "branding": {
            "theme": "auto",
            "accent_color": "#4f46e5",
            "privacy_policy_url": "https://acme.example/privacy",
            "copy": {"sign_in_title": "Sign in to Acme"},
            "design": {"preset": "glass"},
        },
    },
    idempotency_key="acme-siwa-app",
)
print(app["client_id"], app.get("client_secret"))   # the secret is shown once

apps = platform.atlas_id_apps.list()
print(apps["issuer"], apps["discovery_url"])

platform.atlas_id_apps.update(app["id"], {"branding": {"copy": {"sign_in_title": None}}})
platform.atlas_id_apps.rotate_secret(app["id"])
preview = platform.atlas_id_apps.preview_design({"design": {"preset": "midnight"}})

with open("logo.png", "rb") as f:
    asset = platform.design_assets.upload(f.read(), kind="logo")

Other namespaces: apps (create, list, archive, transfer, instances, secret rotation), accountless_apps, design_assets.

Setup check (preflight)

report = atlas.instance.preflight()
for finding in report["findings"]:      # errors first, then warnings, then info
    print(finding["severity"], finding["code"], finding["message"], "->", finding["fix"])

Design

The sign-in page design is typed end to end (models.AtlasDesign for a full design, models.AtlasDesignPatch for a partial update where None removes a setting):

atlas.design.update({"design": {"preset": "forest", "palette": {"primary": "#0f766e"}}})
atlas.design.replace({"design": {"version": 1, "preset": "atlas", "colorScheme": "auto"}})
preview = atlas.design.preview({"design": {"preset": "bold"}})
catalog = atlas.design.catalog()           # presets, fonts, CSS variables

# Per-organization overrides
atlas.organizations.design.update("org_123", {"design": {"palette": {"accent": "#f59e0b"}}})

# Images: send the raw bytes; the type is detected (PNG, JPEG, GIF, WebP)
with open("background.jpg", "rb") as f:
    asset = atlas.design.assets.upload(f.read(), kind="background")
atlas.design.update({"design": {"background": {"image": {"assetId": asset["asset_id"]}}}})

Cookie consent

atlas.instance.cookie_consent.set(
    {"script_url": "https://cmp.example/consent.js", "site_id": "site_123"}
)
print(atlas.instance.cookie_consent.get()["enabled"])
atlas.instance.cookie_consent.delete()

Messaging providers

Each transport has its own typed config (models.EmailProviderConfig, models.SmsProviderConfig):

atlas.messaging_providers.set_email(
    {
        "transport": "smtp",
        "from_address": "Acme <no-reply@acme.example>",
        "config": {"host": "smtp.acme.example", "port": 587, "username": "u", "password": "p"},
    }
)
atlas.messaging_providers.set_sms(
    {"transport": "twilio", "config": {"account_sid": "AC...", "auth_token": "..."}}
)
atlas.messaging_providers.test("email", {"to": "ops@acme.example"})

Social and wallet sign-in providers

configured = atlas.oauth_providers.list(provider=["google", "github"], configured=True)

# Re-brand a button without touching credentials; None clears an override
atlas.oauth_providers.upsert("google", {"display_name": "Google Workspace", "icon_url": None})

# Wallet providers take verifier settings instead of credentials
atlas.oauth_providers.upsert(
    "siwe", {"settings": {"domain": "app.acme.example", "chain_ids": [1, 10]}}
)
atlas.oauth_providers.set_enabled("siwe", {"enabled": True})

Webhooks

ep = atlas.webhooks.endpoints
created = ep.create({"url": "https://acme.example/hooks", "enabled_events": ["user.created"]})
ep.update(created["id"], {"active": False})
ep.reveal_secret(created["id"])
ep.rotate_secret(created["id"])
ep.test(created["id"])
for delivery in ep.list_deliveries(created["id"], limit=20)["data"]:
    ep.redeliver(created["id"], delivery["id"])

API key spend caps

Give an end-user API key caps per unit and period ("request", "day", "month" or "total"), then meter what each call costs. A debit that would exceed a cap records nothing and comes back with allowed: False; it is not raised as an error.

key = atlas.api_keys.create({
    "subject_type": "user",
    "subject_id": "user_123",
    "limits": [
        {"unit": "requests", "amount": 1000, "period": "day"},
        {"unit": "usd_cents", "amount": 5000, "period": "month"},
    ],
})

debit = atlas.api_keys.record_usage(
    key["id"],
    {"unit": "usd_cents", "amount": 12, "idempotency_key": "req_8f2c"},  # retries count once
)
if not debit["allowed"]:
    ...  # debit["code"] == "LIMIT_EXCEEDED"; debit["exceeded"] lists the caps

print(atlas.api_keys.get_usage(key["id"])["usage"])  # used / remaining / resets_at per cap
atlas.api_keys.update(key["id"], {"limits": None})  # remove the caps

api_keys.verify(...) also returns the key's name, scopes, constraints, limits and current usage.

Session keep-alive

If your app loads the Atlas frontend SDK only on some pages, time spent on the other pages can count as inactivity. Touch the session from your backend to slide its inactivity window:

s = atlas.sessions.touch(session_id)
# s["idle_expires_at"] is the new deadline; s["extended"] is False when a touch in the last minute already did it

A touch never extends past the session's absolute expiry and never revives an ended session (409 SESSION_REVOKED, SESSION_IDLE_EXPIRED or SESSION_EXPIRED). It writes at most once a minute, so calling it on every request is safe.

Entitlements and organization policy

atlas.entitlement_overrides.create(
    {"subject_type": "org", "subject_id": "org_123", "limits": {"seats": -1}}  # -1 = unlimited
)
print(atlas.organizations.get_entitlements("org_123"))

# Policy keys are camelCase; None clears an override
atlas.organizations.update_policy(
    "org_123",
    {"requireMfa": True, "allowedSignInMethods": ["password", "oauth:google"], "ipAllowlist": None},
)

Back-channel logout

When a user signs out of Atlas, Atlas POSTs a signed logout_token to your app's backchannel_logout_uri. Verify it, end the matching local sessions, and answer 200:

from atlas_backend import LogoutTokenVerifier, VerificationError, logout_token_from_form

verifier = LogoutTokenVerifier(
    issuer="https://atlasauth.net",        # the issuer in your id_tokens
    client_id="your_client_id",
)

def backchannel_logout(raw_body: bytes) -> tuple[int, dict[str, str]]:
    """Framework-agnostic handler: returns (status, headers)."""
    headers = {"Cache-Control": "no-store"}
    try:
        claims = verifier.verify(logout_token_from_form(raw_body))
    except VerificationError:
        return 400, headers
    if claims.sid:
        sessions.delete_by_atlas_sid(claims.sid)       # your session store
    else:
        sessions.delete_all_for_user(claims.sub)       # "sign out everywhere"
    return 200, headers

The verifier checks the RS256 signature against the issuer's keys (cached, with a throttled refetch), iss, that aud contains your client id, iat (not in the future), exp when present, jti, the back-channel logout event, that sid or sub is present, that there is no nonce, and typ: logout+jwt.

Replay protection. Pass jti_seen= a callable that records each jti and returns True when it has seen it before (the token is then refused with reason "replayed"). Keep entries a few minutes — logout tokens live two. With several app servers, back it with a shared store such as Redis (SET jti 1 NX EX 300).

Namespaces

AtlasClient / AsyncAtlasClient:

users (+ identities, phone_numbers, consents, deletion, directives, approval_requests, grants, erasure, notification_preferences), sessions, organizations (+ memberships, invitations, domains, group_roles, audit_streams, branding, design, settings, end_users, reader_domain), roles, permissions, oauth_clients (+ grants), oauth_providers, resource_servers, sso_connections, sso_onboarding, scim_tokens, scim_provisioning_targets, org_ldap_connections, domains, redirect_urls, email_addresses, waitlist, allowlist, blocklist, invitations, attack_protection, actor_tokens, sign_in_tokens, api_keys, tokens, m2m_tokens, machines, machine_enrolment_tokens, tickets, grants, session_exchange_apps, instance (+ cookie_consent, security), design (+ assets), branding, localizations, email_templates, sms_templates, messaging_providers, notifications (+ categories, templates), webhooks (+ endpoints), log_streams, audit_logs, audit_events, config_changelog, events, usage, jobs, user_imports, user_exports, data_subject_requests, entitlement_overrides, organization_settings_schema, billing (+ plans, subscriptions), actions, connectors, directory, fga (+ stores, authorization_models), openfga (+ stores, authorization_models), jwt_templates, legacy_auth_connection, network_acls, radius_clients, lti_platforms, rate_limit_policy, risk_based_mfa, bot_labels, bot_signals, captcha, managed_waf, diagnostics, mcp, mcp_connector, pca, testing.

AtlasPlatformClient / AsyncAtlasPlatformClient: apps, accountless_apps, atlas_id_apps, design_assets.

Pagination

paginate(list_fn, **params) and collect(list_fn, **params) walk every cursor page of any list that returns { data, has_more, next_cursor }. Async peers: aiterate / acollect.

Errors

Every non-2xx raises AtlasError, carrying:

• status — the HTTP status code.
• errors — the full [{ code, message, param?, meta? }] envelope.
• code — the first error's stable code (what you branch on).
• has_code(code) — True if any error in the envelope has that code.

ErrorCode lists the stable codes, for example ErrorCode.UNKNOWN_FIELD, ErrorCode.INVALID_KEY, ErrorCode.WRONG_KEY_SURFACE (a valid key used on the wrong API, e.g. a platform key on an instance route), ErrorCode.PLAN_IN_USE, ErrorCode.EMAIL_DELIVERY_NOT_CONFIGURED and ErrorCode.EMAIL_PROVIDER_REQUIRED.

Development

pip install -e ".[dev]"
ruff check .
mypy
pytest

The async namespaces are generated from the sync ones. After editing atlas_backend/resources.py, run:

python scripts/gen_async.py && ruff format atlas_backend/aresources.py

tests/test_parity.py fails if the two drift, and tests/test_coverage.py checks every operation in tests/openapi_operations.txt has a method.