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index.ts
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index.ts
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/*
Copyright 2023 The Sigstore Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import { TSA, TSAClient, TSAClientOptions } from './client';
import type { RFC3161SignedTimestamp } from '@sigstore/bundle';
import type { SignatureBundle, Witness } from '../witness';
type RFC3161SignedTimestamps = { rfc3161Timestamps: RFC3161SignedTimestamp[] };
export type TSAWitnessOptions = TSAClientOptions;
export class TSAWitness implements Witness {
private tsa: TSA;
constructor(options: TSAWitnessOptions) {
this.tsa = new TSAClient({
tsaBaseURL: options.tsaBaseURL,
retry: options.retry,
timeout: options.timeout,
});
}
public async testify(
content: SignatureBundle
): Promise<RFC3161SignedTimestamps> {
const signature = extractSignature(content);
const timestamp = await this.tsa.createTimestamp(signature);
return {
rfc3161Timestamps: [{ signedTimestamp: timestamp }],
};
}
}
function extractSignature(content: SignatureBundle) {
switch (content.$case) {
case 'dsseEnvelope':
return content.dsseEnvelope.signatures[0].sig;
case 'messageSignature':
return content.messageSignature.signature;
}
}