// SPDX-FileCopyrightText: 2026 OpenBasil Contributors
//
// SPDX-License-Identifier: Apache-2.0

syntax = "proto3";

import "google/protobuf/struct.proto";

service SpiffeWorkloadAPI {
    /////////////////////////////////////////////////////////////////////////
    // X509-SVID Profile
    /////////////////////////////////////////////////////////////////////////

    // Fetch X.509-SVIDs for all SPIFFE identities the workload is entitled to,
    // as well as related information like trust bundles and CRLs. As this
    // information changes, subsequent messages will be streamed from the
    // server.
    rpc FetchX509SVID(X509SVIDRequest) returns (stream X509SVIDResponse);

    // Fetch trust bundles and CRLs. Useful for clients that only need to
    // validate SVIDs without obtaining an SVID for themself. As this
    // information changes, subsequent messages will be streamed from the
    // server.
    rpc FetchX509Bundles(X509BundlesRequest) returns (stream X509BundlesResponse);

    /////////////////////////////////////////////////////////////////////////
    // JWT-SVID Profile
    /////////////////////////////////////////////////////////////////////////

    // Fetch JWT-SVIDs for all SPIFFE identities the workload is entitled to,
    // for the requested audience. If an optional SPIFFE ID is requested, only
    // the JWT-SVID for that SPIFFE ID is returned.
    rpc FetchJWTSVID(JWTSVIDRequest) returns (JWTSVIDResponse);

    // Fetches the JWT bundles, formatted as JWKS documents, keyed by the
    // SPIFFE ID of the trust domain. As this information changes, subsequent
    // messages will be streamed from the server.
    rpc FetchJWTBundles(JWTBundlesRequest) returns (stream JWTBundlesResponse);

    // Validates a JWT-SVID against the requested audience. Returns the SPIFFE
    // ID of the JWT-SVID and JWT claims.
    rpc ValidateJWTSVID(ValidateJWTSVIDRequest) returns (ValidateJWTSVIDResponse);
}

// The X509SVIDRequest message conveys parameters for requesting an X.509-SVID.
// There are currently no request parameters.
message X509SVIDRequest {  }

// The X509SVIDResponse message carries X.509-SVIDs and related information,
// including a set of global CRLs and a list of bundles the workload may use
// for federating with foreign trust domains.
message X509SVIDResponse {
    // Required. A list of X509SVID messages, each of which includes a single
    // X.509-SVID, its private key, and the bundle for the trust domain.
    repeated X509SVID svids = 1;

    // Optional. ASN.1 DER encoded (not PEM) certificate revocation lists.
    repeated bytes crl = 2;

    // Optional. CA certificate bundles belonging to foreign trust domains that
    // the workload should trust, keyed by the SPIFFE ID of the foreign trust
    // domain. Bundles are ASN.1 DER encoded (not PEM).
    map<string, bytes> federated_bundles = 3;
}

// The X509SVID message carries a single SVID and all associated information,
// including the X.509 bundle for the trust domain.
message X509SVID {
    // Required. The SPIFFE ID of the SVID in this entry
    string spiffe_id = 1;

    // Required. ASN.1 DER encoded (not PEM) certificate chain. MAY include
    // intermediates, the leaf certificate (or SVID itself) MUST come first.
    bytes x509_svid = 2;

    // Required. ASN.1 DER encoded (not PEM) PKCS#8 private key. MUST be unencrypted.
    bytes x509_svid_key = 3;

    // Required. ASN.1 DER encoded (not PEM) X.509 bundle for the trust domain.
    bytes bundle = 4;

    // Optional. An operator-specified string used to provide guidance on how this
    // identity should be used by a workload when more than one SVID is returned.
    // For example, `internal` and `external` to indicate an SVID for internal or
    // external use, respectively.
    string hint = 5;
}

// The X509BundlesRequest message conveys parameters for requesting X.509
// bundles. There are currently no such parameters.
message X509BundlesRequest {
}

// The X509BundlesResponse message carries a set of global CRLs and a map of
// trust bundles the workload should trust.
message X509BundlesResponse {
    // Optional. ASN.1 DER encoded (not PEM) certificate revocation lists.
    repeated bytes crl = 1;

    // Required. CA certificate bundles belonging to trust domains that the
    // workload should trust, keyed by the SPIFFE ID of the trust domain.
    // Bundles are ASN.1 DER encoded (not PEM).
    map<string, bytes> bundles = 2;
}

message JWTSVIDRequest {
    // Required. The audience(s) the workload intends to authenticate against.
    repeated string audience = 1;

    // Optional. The requested SPIFFE ID for the JWT-SVID. If unset, all
    // JWT-SVIDs to which the workload is entitled are requested.
    string spiffe_id = 2;
}

// The JWTSVIDResponse message conveys JWT-SVIDs.
message JWTSVIDResponse {
    // Required. The list of returned JWT-SVIDs.
    repeated JWTSVID svids = 1;
}

// The JWTSVID message carries the JWT-SVID token and associated metadata.
message JWTSVID {
    // Required. The SPIFFE ID of the JWT-SVID.
    string spiffe_id = 1;

    // Required. Encoded JWT using JWS Compact Serialization.
    string svid = 2;

    // Optional. An operator-specified string used to provide guidance on how this
    // identity should be used by a workload when more than one SVID is returned.
    // For example, `internal` and `external` to indicate an SVID for internal or
    // external use, respectively.
    string hint = 3;
}

// The JWTBundlesRequest message conveys parameters for requesting JWT bundles.
// There are currently no such parameters.
message JWTBundlesRequest { }

// The JWTBundlesResponse conveys JWT bundles.
message JWTBundlesResponse {
    // Required. JWK encoded JWT bundles, keyed by the SPIFFE ID of the trust
    // domain.
    map<string, bytes> bundles = 1;
}

// The ValidateJWTSVIDRequest message conveys request parameters for
// JWT-SVID validation.
message ValidateJWTSVIDRequest {
    // Required. The audience of the validating party. The JWT-SVID must
    // contain an audience claim which contains this value in order to
    // successfully validate.
    string audience = 1;

    // Required. The JWT-SVID to validate, encoded using JWS Compact
    // Serialization.
    string svid = 2;
}

// The ValidateJWTSVIDResponse message conveys the JWT-SVID validation results.
message ValidateJWTSVIDResponse {
    // Required. The SPIFFE ID of the validated JWT-SVID.
    string spiffe_id = 1;

    // Required. Claims contained within the payload of the validated JWT-SVID.
    // This includes both SPIFFE-required and non-required claims.
    google.protobuf.Struct claims = 2;
}
