68 lines
2.2 KiB
JavaScript
68 lines
2.2 KiB
JavaScript
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import { FlattenedSign } from '../flattened/sign.js';
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import { JWSInvalid } from '../../util/errors.js';
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class IndividualSignature {
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constructor(sig, key, options) {
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this.parent = sig;
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this.key = key;
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this.options = options;
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}
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setProtectedHeader(protectedHeader) {
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if (this.protectedHeader) {
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throw new TypeError('setProtectedHeader can only be called once');
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}
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this.protectedHeader = protectedHeader;
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return this;
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}
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setUnprotectedHeader(unprotectedHeader) {
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if (this.unprotectedHeader) {
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throw new TypeError('setUnprotectedHeader can only be called once');
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}
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this.unprotectedHeader = unprotectedHeader;
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return this;
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}
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addSignature(...args) {
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return this.parent.addSignature(...args);
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}
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sign(...args) {
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return this.parent.sign(...args);
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}
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done() {
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return this.parent;
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}
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}
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export class GeneralSign {
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constructor(payload) {
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this._signatures = [];
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this._payload = payload;
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}
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addSignature(key, options) {
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const signature = new IndividualSignature(this, key, options);
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this._signatures.push(signature);
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return signature;
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}
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async sign() {
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if (!this._signatures.length) {
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throw new JWSInvalid('at least one signature must be added');
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}
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const jws = {
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signatures: [],
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payload: '',
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};
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for (let i = 0; i < this._signatures.length; i++) {
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const signature = this._signatures[i];
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const flattened = new FlattenedSign(this._payload);
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flattened.setProtectedHeader(signature.protectedHeader);
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flattened.setUnprotectedHeader(signature.unprotectedHeader);
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const { payload, ...rest } = await flattened.sign(signature.key, signature.options);
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if (i === 0) {
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jws.payload = payload;
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}
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else if (jws.payload !== payload) {
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throw new JWSInvalid('inconsistent use of JWS Unencoded Payload (RFC7797)');
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}
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jws.signatures.push(rest);
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}
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return jws;
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}
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}
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