@animo-id/pex
Version:
A Typescript implementation of the v1 and v2 DIF Presentation Exchange specification
113 lines • 11.7 kB
JavaScript
import { Optionality } from '@sphereon/pex-models';
import { Status } from '../../ConstraintUtils';
import PexMessages from '../../types/Messages';
import { AbstractEvaluationHandler } from './abstractEvaluationHandler';
export class PredicateRelatedFieldEvaluationHandler extends AbstractEvaluationHandler {
constructor(client) {
super(client);
}
getName() {
return 'PredicateRelatedFieldEvaluation';
}
handle(pd) {
// PresentationDefinitionV2 is the common denominator
pd.input_descriptors.forEach((inDesc, index) => {
if (inDesc.constraints) {
this.examinePredicateRelatedField(index, inDesc.constraints);
}
});
this.updatePresentationSubmission(pd);
}
examinePredicateRelatedField(input_descriptor_idx, constraints) {
if (constraints?.fields) {
for (let i = 0; i < constraints.fields.length; i++) {
for (let j = 0; j < this.getResults().length; j++) {
this.examinePredicateForFilterEvaluationResult(this.getResults(), j, input_descriptor_idx, constraints, i);
}
}
}
}
examinePredicateForFilterEvaluationResult(results, resultIdx, input_descriptor_idx, constraints, fieldIdx) {
const resultInputDescriptorIdx = this.retrieveResultInputDescriptorIdx(results[resultIdx].input_descriptor_path);
if (results[resultIdx].payload &&
results[resultIdx].payload.result &&
results[resultIdx].payload.result.path &&
results[resultIdx].evaluator === 'FilterEvaluation' &&
input_descriptor_idx === resultInputDescriptorIdx &&
constraints &&
constraints.fields &&
constraints.fields[fieldIdx] &&
constraints.fields[fieldIdx].predicate &&
constraints.fields[fieldIdx].path &&
constraints.fields[fieldIdx].path?.includes(this.concatenatePath(results[resultIdx].payload.result.path))) {
const field = constraints.fields[fieldIdx];
const evaluationResult = { ...results[resultIdx].payload.result };
// We only support number with minimum/maximum for predicate type
if ((field.filter?.type !== 'number' && field.filter?.type !== 'integer') ||
(!field.filter.minimum && !field.filter.exclusiveMinimum && !field.filter.maximum && !field.filter.exclusiveMaximum)) {
results.push(this.createErrorResultObject(input_descriptor_idx, resultIdx, evaluationResult, results, "Only 'number' and 'integer' predicate with 'minimum', 'exclusiveMinimum', 'maximum', or 'exclusiveMaximum' supported."));
return;
}
if (evaluationResult.value === true) {
const resultObject = this.createResultObject(input_descriptor_idx, resultIdx, evaluationResult, results);
results.push(resultObject);
}
else if (field.predicate === Optionality.Required) {
const resultObject = this.createWarnResultObject(input_descriptor_idx, resultIdx, evaluationResult, results, 'Predicate is required but not applied');
results.push(resultObject);
}
}
}
retrieveResultInputDescriptorIdx(input_descriptor_path) {
const inputDescriptorText = '$.input_descriptors[';
const startIdx = input_descriptor_path.indexOf(inputDescriptorText);
const startWithIdx = input_descriptor_path.substring(startIdx + inputDescriptorText.length);
const endIdx = startWithIdx.indexOf(']');
const idx = startWithIdx.substring(0, endIdx);
return parseInt(idx);
}
concatenatePath(path) {
let completePath = '';
for (let i = 0; i < path.length; i++) {
if (typeof path[i] === 'number') {
completePath = completePath.substring(0, completePath.length - 1);
completePath += '[*].';
}
else {
completePath += path[i] + '.';
}
}
return completePath.substring(0, completePath.length - 1);
}
createResultObject(input_descriptor_idx, resultIdx, evaluationResult, results) {
return {
input_descriptor_path: `$.input_descriptors[${input_descriptor_idx}]`,
verifiable_credential_path: results[resultIdx].verifiable_credential_path,
evaluator: this.getName(),
status: Status.INFO,
message: PexMessages.INPUT_CANDIDATE_IS_ELIGIBLE_FOR_PRESENTATION_SUBMISSION,
payload: evaluationResult,
};
}
createWarnResultObject(input_descriptor_idx, resultIdx, evaluationResult, results, message) {
return {
input_descriptor_path: `$.input_descriptors[${input_descriptor_idx}]`,
verifiable_credential_path: results[resultIdx].verifiable_credential_path,
evaluator: this.getName(),
status: Status.WARN,
message,
payload: evaluationResult,
};
}
createErrorResultObject(input_descriptor_idx, resultIdx, evaluationResult, results, message) {
return {
input_descriptor_path: `$.input_descriptors[${input_descriptor_idx}]`,
verifiable_credential_path: results[resultIdx].verifiable_credential_path,
evaluator: this.getName(),
status: Status.ERROR,
message,
payload: evaluationResult,
};
}
}
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