@sphereon/pex
Version:
A Typescript implementation of the v1 and v2 DIF Presentation Exchange specification
204 lines • 22.6 kB
JavaScript
import { Optionality } from '@sphereon/pex-models';
import { CredentialMapper, } from '@sphereon/ssi-types';
import { Status } from '../../ConstraintUtils';
import PexMessages from '../../types/Messages';
import { applySdJwtLimitDisclosure, JsonPathUtils } from '../../utils';
import { AbstractEvaluationHandler } from './abstractEvaluationHandler';
import { eligibleInputDescriptorsForWrappedVc } from './markForSubmissionEvaluationHandler';
export class LimitDisclosureEvaluationHandler extends AbstractEvaluationHandler {
constructor(client) {
super(client);
}
getName() {
return 'LimitDisclosureEvaluation';
}
handle(pd, wrappedVcs) {
this.evaluateLimitDisclosure(pd.input_descriptors, wrappedVcs);
}
isLimitDisclosureSupported(eligibleInputDescriptors, wvc, vcIndex) {
if (wvc.format === 'vc+sd-jwt' || wvc.format === 'mso_mdoc')
return true;
if (wvc.format === 'ldp' || wvc.format === 'jwt')
return false;
const limitDisclosureSignatures = this.client.limitDisclosureSignatureSuites;
const decoded = wvc.decoded;
const proofs = Array.isArray(decoded.proof) ? decoded.proof : decoded.proof ? [decoded.proof] : undefined;
const requiredLimitDisclosureInputDescriptorIds = eligibleInputDescriptors
.map(({ inputDescriptor: { constraints }, inputDescriptorIndex }) => constraints?.limit_disclosure === Optionality.Required ? inputDescriptorIndex : undefined)
.filter((id) => id !== undefined);
if (!proofs || proofs.length === 0 || proofs.length > 1 || !proofs[0].type) {
// todo: Support/inspect array based proofs
if (requiredLimitDisclosureInputDescriptorIds.length > 0) {
this.createLimitDisclosureNotSupportedResult(eligibleInputDescriptors.map((i) => i.inputDescriptorIndex), vcIndex, 'Multiple proofs on verifiable credential not supported for limit disclosure');
}
return false;
}
const proof = proofs[0];
const signatureSuite = proof.cryptosuite ? `${proof.type}.${proof.cryptosuite}` : proof.type;
if (!limitDisclosureSignatures?.includes(signatureSuite)) {
if (requiredLimitDisclosureInputDescriptorIds.length > 0) {
this.createLimitDisclosureNotSupportedResult(requiredLimitDisclosureInputDescriptorIds, vcIndex, `Signature suite '${signatureSuite}' is not present in limitDisclosureSignatureSuites [${limitDisclosureSignatures.join(',')}]`);
}
return false;
}
return true;
}
evaluateLimitDisclosure(inputDescriptors, wrappedVcs) {
wrappedVcs.forEach((wvc, vcIndex) => {
const eligibleInputDescriptors = eligibleInputDescriptorsForWrappedVc(inputDescriptors, vcIndex, this.getResults());
const includeLimitDisclosure = eligibleInputDescriptors.some(({ inputDescriptor: { constraints } }) => constraints?.limit_disclosure === Optionality.Preferred || constraints?.limit_disclosure === Optionality.Required);
if (eligibleInputDescriptors.length > 0 && includeLimitDisclosure && this.isLimitDisclosureSupported(eligibleInputDescriptors, wvc, vcIndex)) {
this.enforceLimitDisclosure(wrappedVcs, eligibleInputDescriptors, vcIndex);
}
});
}
enforceLimitDisclosure(wrappedVcs, eligibleInputDescriptors, vcIndex) {
const wvc = wrappedVcs[vcIndex];
if (CredentialMapper.isWrappedSdJwtVerifiableCredential(wvc)) {
const presentationFrame = this.createSdJwtPresentationFrame(eligibleInputDescriptors, wvc.credential, vcIndex);
// We update the SD-JWT to it's presentation format (remove disclosures, update pretty payload, etc..), except
// we don't create or include the (optional) KB-JWT yet, this is done when we create the presentation
if (presentationFrame) {
applySdJwtLimitDisclosure(wvc.credential, presentationFrame);
wvc.decoded = wvc.credential.decodedPayload;
// We need to overwrite the original, as that is returned in the selectFrom method
// But we also want to keep the format of the original credential.
wvc.original = CredentialMapper.isSdJwtDecodedCredential(wvc.original) ? wvc.credential : wvc.credential.compactSdJwtVc;
for (const { inputDescriptorIndex, inputDescriptor } of eligibleInputDescriptors) {
this.createSuccessResult(inputDescriptorIndex, `$[${vcIndex}]`, inputDescriptor.constraints?.limit_disclosure);
}
}
}
else if (CredentialMapper.isWrappedMdocCredential(wvc)) {
for (const { inputDescriptorIndex, inputDescriptor } of eligibleInputDescriptors) {
this.createSuccessResult(inputDescriptorIndex, `$[${vcIndex}]`, inputDescriptor.constraints?.limit_disclosure);
}
}
else if (CredentialMapper.isWrappedW3CVerifiableCredential(wvc)) {
const internalCredentialToSend = this.createVcWithRequiredFields(eligibleInputDescriptors, wvc.credential, vcIndex);
/* When verifiableCredentialToSend is null/undefined an error is raised, the credential will
* remain untouched and the verifiable credential won't be submitted.
*/
if (internalCredentialToSend) {
wvc.credential = internalCredentialToSend;
for (const { inputDescriptorIndex, inputDescriptor } of eligibleInputDescriptors) {
this.createSuccessResult(inputDescriptorIndex, `$[${vcIndex}]`, inputDescriptor.constraints?.limit_disclosure);
}
}
}
else {
throw new Error('Unsupported format for selective disclosure');
}
}
createSdJwtPresentationFrame(inputDescriptors, vc, vcIndex) {
// Mapping of key -> true to indicate which values should be disclosed in an SD-JWT
// Can be nested array / object
const presentationFrame = {};
const processNestedObject = (obj, currentPath, basePath) => {
if (obj === null || typeof obj !== 'object') {
// For literal values, set the path to true in the presentation frame
JsonPathUtils.setValue(presentationFrame, currentPath, true);
return;
}
// For arrays, process each element
if (Array.isArray(obj)) {
obj.forEach((item, index) => {
processNestedObject(item, [...currentPath, index], basePath);
});
return;
}
// For objects, process each child property
Object.entries(obj).forEach(([key, value]) => {
processNestedObject(value, [...currentPath, key], basePath);
});
};
for (const { inputDescriptor, inputDescriptorIndex } of inputDescriptors) {
for (const field of inputDescriptor.constraints?.fields ?? []) {
if (field.path) {
const inputField = JsonPathUtils.extractInputField(vc.decodedPayload, field.path);
if (inputField.length > 0) {
const selectedField = inputField[0];
const fieldValue = JsonPathUtils.getValue(vc.decodedPayload, selectedField.path);
if (fieldValue !== null && typeof fieldValue === 'object') {
// For objects, recursively process all nested fields
processNestedObject(fieldValue, selectedField.path, selectedField.path);
}
else {
// For literal values, just set the path to true
JsonPathUtils.setValue(presentationFrame, selectedField.path, true);
}
}
else {
this.createMandatoryFieldNotFoundResult(inputDescriptorIndex, vcIndex, field.path);
return undefined;
}
}
}
}
return presentationFrame;
}
createVcWithRequiredFields(inputDescriptors, vc, vcIndex) {
let credentialToSend = {};
credentialToSend = Object.assign(credentialToSend, vc);
credentialToSend.credentialSubject = {};
for (const { inputDescriptor, inputDescriptorIndex } of inputDescriptors) {
for (const field of inputDescriptor.constraints?.fields ?? []) {
if (field.path) {
const inputField = JsonPathUtils.extractInputField(vc, field.path);
if (inputField.length > 0) {
credentialToSend = this.copyResultPathToDestinationCredential(inputField[0], vc, credentialToSend);
}
else {
this.createMandatoryFieldNotFoundResult(inputDescriptorIndex, vcIndex, field.path);
return undefined;
}
}
}
}
return credentialToSend;
}
copyResultPathToDestinationCredential(requiredField, internalCredential, internalCredentialToSend) {
//TODO: ESSIFI-186
let credentialSubject = { ...internalCredential.credentialSubject };
requiredField.path.forEach((e) => {
if (credentialSubject[e]) {
credentialSubject = { [e]: credentialSubject[e] };
}
});
internalCredentialToSend.credentialSubject = {
...internalCredentialToSend.credentialSubject,
...credentialSubject,
};
return internalCredentialToSend;
}
createSuccessResult(idIdx, path, limitDisclosure) {
return this.getResults().push({
input_descriptor_path: `$.input_descriptors[${idIdx}]`,
verifiable_credential_path: `${path}`,
evaluator: this.getName(),
status: limitDisclosure === Optionality.Required ? Status.INFO : Status.WARN,
message: PexMessages.LIMIT_DISCLOSURE_APPLIED,
payload: undefined,
});
}
createMandatoryFieldNotFoundResult(idIdx, vcIdx, path) {
return this.getResults().push({
input_descriptor_path: `$.input_descriptors[${idIdx}]`,
verifiable_credential_path: `$[${vcIdx}]`,
evaluator: this.getName(),
status: Status.ERROR,
message: PexMessages.VERIFIABLE_CREDENTIAL_MANDATORY_FIELD_NOT_PRESENT,
payload: path,
});
}
createLimitDisclosureNotSupportedResult(idIdxs, vcIdx, reason) {
return this.getResults().push(...idIdxs.map((idIdx) => ({
input_descriptor_path: `$.input_descriptors[${idIdx}]`,
verifiable_credential_path: `$[${vcIdx}]`,
evaluator: this.getName(),
status: Status.ERROR,
message: reason ? `${PexMessages.LIMIT_DISCLOSURE_NOT_SUPPORTED}. ${reason}` : PexMessages.LIMIT_DISCLOSURE_NOT_SUPPORTED,
})));
}
}
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