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Version: 2.27

OAuth

haystack_integrations.components.connectors.oauth.resolver​

OAuthTokenResolver​

Resolves an OAuth access token at pipeline runtime and emits it on the access_token output socket.

The resolver component is a thin wrapper over a pluggable token source that decides where the token comes from: a standalone OAuth refresh grant (OAuthRefreshTokenSource), a per-request token exchange (OAuthTokenExchangeSource), a static long-lived token (OAuthStaticTokenSource), or a custom source you provide. A downstream component (for example a SharePoint or Google Drive retriever) consumes the token via a normal connection and never knows how it was resolved.

The run input depends on the token source. A source that needs a per-request credential (it sets requires_subject_token = True, like OAuthTokenExchangeSource) makes the resolver declare a mandatory subject_token input — a controller-injected per-request credential (for example an incoming user assertion), not chosen by an end user. A config-only source declares no run input, so the resolver is a source node.

Usage example​

python
from haystack.utils import Secret
from haystack_integrations.components.connectors.oauth import OAuthTokenResolver
from haystack_integrations.utils.oauth import OAuthRefreshTokenSource

resolver = OAuthTokenResolver(
    token_source=OAuthRefreshTokenSource(
        token_url="https://login.microsoftonline.com/common/oauth2/v2.0/token",
        client_id="aaa-bbb-ccc",
        refresh_token=Secret.from_env_var("MS_REFRESH_TOKEN"),
        scopes=["https://graph.microsoft.com/Files.Read.All", "offline_access"],
    ),
)
access_token = resolver.run()["access_token"]

init​

python
__init__(token_source: TokenSource | SubjectTokenSource) -> None

Initialize the resolver.

Parameters:

  • token_source (TokenSource | SubjectTokenSource) – The strategy that resolves the access token. If it sets requires_subject_token = True (for example OAuthTokenExchangeSource), the resolver declares a mandatory subject_token run input; otherwise the resolver takes no run input.

Raises:

  • OAuthConfigError – If token_source does not implement a token-source protocol.

run​

python
run(**kwargs: Any) -> dict[str, str]

Resolve an access token and emit it.

Parameters:

  • kwargs (Any) – Carries subject_token when the configured source requires it (declared as a mandatory input in that case, injected by the application/controller per request). For config-only sources no input is declared and kwargs is empty.

Returns:

  • dict[str, str] – A dictionary with a single access_token key containing a bearer token string.

Raises:

  • OAuthConfigError – If the source requires a subject_token but it is missing or empty.

run_async​

python
run_async(**kwargs: Any) -> dict[str, str]

Asynchronously resolve an access token and emit it.

Parameters:

  • kwargs (Any) – Carries subject_token when the configured source requires it.

Returns:

  • dict[str, str] – A dictionary with a single access_token key containing a bearer token string.

Raises:

  • OAuthConfigError – If the source requires a subject_token but it is missing or empty.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize this component to a dictionary.

Returns:

  • dict[str, Any] – The serialized component as a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> OAuthTokenResolver

Deserialize this component from a dictionary.

Parameters:

  • data (dict[str, Any]) – The dictionary representation of this component.

Returns:

  • OAuthTokenResolver – The deserialized component instance.

Raises:

  • ImportError – If the serialized token_source type cannot be imported.

haystack_integrations.utils.oauth.errors​

OAuthError​

Bases: Exception

Base class for errors raised by the OAuth integration.

OAuthConfigError​

Bases: OAuthError

Raised when an OAuth component or token source is misconfigured.

TokenRefreshError​

Bases: OAuthError

Raised when a token cannot be resolved or refreshed at the identity provider.

haystack_integrations.utils.oauth.protocols​

TokenSource​

Bases: Protocol

A token source that resolves an access token with no per-request input (a config-only source).

Implemented by sources whose credential is fixed at construction time — e.g. OAuthRefreshTokenSource and OAuthStaticTokenSource. Such sources set the class attribute requires_subject_token = False, and OAuthTokenResolver runs them as source nodes (no run input).

resolve​

python
resolve() -> str

Return a valid access token.

resolve_async​

python
resolve_async() -> str

Asynchronous counterpart of resolve.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize the source to a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> TokenSource

Deserialize the source from a dictionary.

SubjectTokenSource​

Bases: Protocol

A token source that resolves an access token by exchanging a per-request subject token.

The subject_token is a controller-injected per-request credential (for example an incoming user assertion), not chosen by an end user. Implemented by OAuthTokenExchangeSource. Such sources set the class attribute requires_subject_token = True, which makes OAuthTokenResolver declare a mandatory subject_token run input.

resolve​

python
resolve(subject_token: str) -> str

Return a valid access token for the per-request subject_token.

resolve_async​

python
resolve_async(subject_token: str) -> str

Asynchronous counterpart of resolve.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize the source to a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> SubjectTokenSource

Deserialize the source from a dictionary.

haystack_integrations.utils.oauth.sources​

OAuthRefreshTokenSource​

Resolves access tokens by running the RFC 6749 refresh-token grant against an OAuth token endpoint.

Given a stored refresh token plus client credentials, it exchanges them for an access token and caches it in process until shortly before expiry. If the identity provider rotates the refresh token on exchange, the new value is kept for the lifetime of the process and surfaced through the optional on_rotate callback so it can be persisted.

This source is single-identity: one refresh token per instance, and its in-process cache is not shared across processes. In a multi-replica deployment each replica keeps its own cache, so for providers that rotate (issue single-use) refresh tokens the replicas can invalidate one another's token unless rotations are persisted to a shared store via on_rotate and a single owner drives the refresh.

Choose this source for a single fixed identity backed by a refresh grant. For a long-lived, non-expiring token use OAuthStaticTokenSource; for multi-replica or multi-user backends use OAuthTokenExchangeSource.

init​

python
__init__(
    token_url: str,
    client_id: str,
    *,
    refresh_token: Secret = Secret.from_env_var("OAUTH_REFRESH_TOKEN"),
    client_secret: Secret | None = None,
    scopes: list[str] | None = None,
    scope_delimiter: str = " ",
    expiry_buffer_seconds: int = DEFAULT_EXPIRY_BUFFER_SECONDS,
    timeout: float = DEFAULT_TIMEOUT_SECONDS,
    on_rotate: Callable[[str], None] | None = None
) -> None

Initialize the source.

Parameters:

  • token_url (str) – The OAuth 2.0 token endpoint.
  • client_id (str) – The OAuth client identifier.
  • refresh_token (Secret) – The refresh token to exchange. Defaults to the value of the OAUTH_REFRESH_TOKEN environment variable.
  • client_secret (Secret | None) – The client secret for confidential clients. Omit it for public clients.
  • scopes (list[str] | None) – The OAuth scopes to request, joined with scope_delimiter. Scope values are provider-specific (consult your identity provider's documentation).
  • scope_delimiter (str) – The delimiter used to join scopes. Defaults to a space (some providers use a comma).
  • expiry_buffer_seconds (int) – Refresh the cached access token this many seconds before its declared expiry.
  • timeout (float) – The timeout, in seconds, for the request to the token endpoint.
  • on_rotate (Callable\[[str], None] | None) – An optional callback invoked with the new refresh token whenever the provider rotates it. Use it to persist the rotated token durably (the source itself only keeps it in process).

Raises:

  • OAuthConfigError – If the configuration is invalid.

resolve​

python
resolve() -> str

Return a cached access token, or run the refresh-token grant to obtain a fresh one.

Returns:

  • str – A valid bearer access token.

resolve_async​

python
resolve_async() -> str

Asynchronous counterpart of resolve. Use a single instance in either sync or async mode, not both.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize the source to a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> OAuthRefreshTokenSource

Deserialize the source from a dictionary.

OAuthTokenExchangeSource​

Resolves access tokens by exchanging a per-request subject token at an OAuth token endpoint.

This implements RFC 8693 token exchange (and, via configuration, Microsoft's on-behalf-of flow). Unlike OAuthRefreshTokenSource, it is multi-user without any persistent storage: the per-request subject_token (the incoming user assertion) is the user identity and is exchanged fresh for a downstream token. Resolved tokens are cached in memory per subject token (bounded, LRU) until shortly before expiry. Because no per-instance state is persisted, it is also the right choice for multi-replica deployments.

Provider differences are expressed as configuration: grant_type, subject_token_param (for example assertion for Microsoft), scopes, and extra_token_params (for example {"requested_token_use": "on_behalf_of"}).

init​

python
__init__(
    token_url: str,
    client_id: str,
    *,
    client_secret: Secret | None = None,
    grant_type: str = DEFAULT_TOKEN_EXCHANGE_GRANT,
    subject_token_param: str = "subject_token",
    subject_token_type: str | None = None,
    requested_token_type: str | None = None,
    scopes: list[str] | None = None,
    scope_delimiter: str = " ",
    extra_token_params: dict[str, str] | None = None,
    expiry_buffer_seconds: int = DEFAULT_EXPIRY_BUFFER_SECONDS,
    cache_max_size: int = DEFAULT_CACHE_MAX_SIZE,
    timeout: float = DEFAULT_TIMEOUT_SECONDS
) -> None

Initialize the source.

Parameters:

  • token_url (str) – The OAuth 2.0 token endpoint.
  • client_id (str) – The OAuth client identifier.
  • client_secret (Secret | None) – The client secret for confidential clients. Omit it for public clients.
  • grant_type (str) – The grant type sent as the grant_type form parameter. Defaults to the RFC 8693 token-exchange grant. Set it to the value your provider expects (for example the urn:ietf:params:oauth:grant-type:jwt-bearer grant for Microsoft on-behalf-of).
  • subject_token_param (str) – The name of the form parameter carrying the per-request subject token. Defaults to subject_token (RFC 8693). Some providers expect a different name, such as assertion.
  • subject_token_type (str | None) – The RFC 8693 identifier for the type of the supplied subject token, sent as the subject_token_type form parameter (omitted when not set). Required by RFC 8693 token exchange (e.g. urn:ietf:params:oauth:token-type:access_token); not used by Microsoft's on-behalf-of flow.
  • requested_token_type (str | None) – The RFC 8693 identifier for the token to return, sent as the requested_token_type form parameter (omitted when not set). Optional.
  • scopes (list[str] | None) – The OAuth scopes to request, joined with scope_delimiter. Scope values are provider-specific (consult your identity provider's documentation); only the wire format is standardized (RFC 6749 §3.3).
  • scope_delimiter (str) – The delimiter used to join scopes. Defaults to a space.
  • extra_token_params (dict[str, str] | None) – Additional form parameters included verbatim in every request (for example {"requested_token_use": "on_behalf_of"}). Applied last, so any key here overrides the corresponding form parameter derived from the other arguments (for example grant_type, subject_token_type, requested_token_type, scope, or client_secret).
  • expiry_buffer_seconds (int) – Refresh a cached access token this many seconds before its declared expiry.
  • cache_max_size (int) – The maximum number of per-user tokens to keep in the in-memory cache. The least-recently-used entry is evicted when the cache is full.
  • timeout (float) – The timeout, in seconds, for the request to the token endpoint.

Raises:

  • OAuthConfigError – If the configuration is invalid.

resolve​

python
resolve(subject_token: str) -> str

Exchange the per-request subject_token for an access token (cached per subject token).

Parameters:

  • subject_token (str) – The controller-injected per-request subject token (for example an incoming user assertion) to exchange for a downstream access token.

Returns:

  • str – A valid bearer access token for the given subject_token.

resolve_async​

python
resolve_async(subject_token: str) -> str

Asynchronous counterpart of resolve.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize the source to a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> OAuthTokenExchangeSource

Deserialize the source from a dictionary.

OAuthStaticTokenSource​

Returns a configured long-lived access token as-is.

Suitable for providers that issue non-expiring tokens (for example Slack or Notion), where no refresh flow is needed and the token is managed out of band. If the provider issues short-lived tokens that must be refreshed, use OAuthRefreshTokenSource instead. It takes no per-request input.

init​

python
__init__(token: Secret) -> None

Initialize the source.

Parameters:

  • token (Secret) – The long-lived access token to return.

resolve​

python
resolve() -> str

Return the configured token.

Returns:

  • str – The configured long-lived access token.

resolve_async​

python
resolve_async() -> str

Asynchronous counterpart of resolve.

to_dict​

python
to_dict() -> dict[str, Any]

Serialize the source to a dictionary.

from_dict​

python
from_dict(data: dict[str, Any]) -> OAuthStaticTokenSource

Deserialize the source from a dictionary.