Allow bigints as type integer

packages/browser-wallet/CHANGELOG.md

@@ -6,6 +6,7 @@
 
 -   Changed 'Zero Knowledge' to 'Zero-knowledge' in display texts.
 -   An issue with images in verifiable credentials for lower resolutions.
+-   Schema validation of verifiable credentials with attributes that have `{ type: "integer" }` no longer rejects BigInt values.
 
 ## 1.1.6
 

packages/browser-wallet/src/background/web3Id.ts

@@ -12,6 +12,8 @@ import {
     IdStatement,
     StatementTypes,
     AttributeType,
+    isTimestampAttribute,
+    TimestampAttribute,
 } from '@concordium/web-sdk';
 import {
     sessionVerifiableCredentials,
@@ -126,12 +128,21 @@ function rejectRequest(message: string): { run: false; response: MessageStatusWr
     };
 }
 
+// TODO Expose function from SDK and re-use.
+function timestampToDate(attribute: TimestampAttribute): Date {
+    return new Date(Date.parse(attribute.timestamp));
+}
+
 function validateTimestampAttribute(attributeTag: string, attributeValue: AttributeType) {
-    if (
-        attributeValue instanceof Date &&
-        (attributeValue.getTime() < MIN_DATE_TIMESTAMP || attributeValue.getTime() > MAX_DATE_TIMESTAMP)
-    ) {
-        return `The attribute [${attributeValue}] for key [${attributeTag}] is out of bounds for a Date. The Date must be between ${MIN_DATE_ISO} and ${MAX_DATE_ISO}`;
+    if (isTimestampAttribute(attributeValue)) {
+        const timestamp = timestampToDate(attributeValue).getTime();
+        if (Number.isNaN(timestamp)) {
+            return `The attribute [${attributeValue.timestamp}] for key [${attributeTag}] cannot be parsed as a Date.`;
+        }
+
+        if (timestamp < MIN_DATE_TIMESTAMP || timestamp > MAX_DATE_TIMESTAMP) {
+            return `The attribute [${attributeValue.timestamp}] for key [${attributeTag}] is out of bounds for a Date. The Date must be between ${MIN_DATE_ISO} and ${MAX_DATE_ISO}`;
+        }
     }
     return undefined;
 }
@@ -154,6 +165,14 @@ function validateAttributeBounds(
     attributeTag: string,
     attributeValue: AttributeType
 ): { error: false } | { error: true; message: string } {
+    if (
+        typeof attributeValue !== 'string' &&
+        typeof attributeValue !== 'bigint' &&
+        !isTimestampAttribute(attributeValue)
+    ) {
+        return { error: true, message: 'Unsupported attribute type' };
+    }
+
     const stringError = validateStringAttribute(attributeTag, attributeValue);
     if (stringError) {
         return { error: true, message: stringError };

packages/browser-wallet/src/popup/pages/AddWeb3IdCredential/AddWeb3IdCredential.tsx

@@ -17,6 +17,7 @@ import { useAsyncMemo } from 'wallet-common-helpers';
 import { useHdWallet } from '@popup/shared/utils/account-helpers';
 import { displayUrl } from '@popup/shared/utils/string-helpers';
 import {
+    coerceBigIntIntegerToNumber,
     createCredentialId,
     createPublicKeyIdentifier,
     fetchCredentialMetadata,
@@ -123,7 +124,8 @@ export default function AddWeb3IdCredential({ onAllow, onReject }: Props) {
                 const schemaWithNoId = withIdRemovedFromSchema(schema);
                 const validationResult = validator.validate(
                     { credentialSubject: credential.credentialSubject },
-                    schemaWithNoId as unknown as Schema
+                    schemaWithNoId as unknown as Schema,
+                    { preValidateProperty: coerceBigIntIntegerToNumber }
                 );
                 if (!validationResult.valid) {
                     setError(t('error.schemaValidation', { errors: validationResult.errors.toString() }));

packages/browser-wallet/src/shared/utils/verifiable-credential-helpers.ts

@@ -15,7 +15,7 @@ import {
     VerifiableCredentialStatus,
 } from '@shared/storage/types';
 import { Buffer } from 'buffer/';
-import jsonschema from 'jsonschema';
+import jsonschema, { Schema } from 'jsonschema';
 import { applyExecutionNRGBuffer, getContractName } from './contract-helpers';
 import { getNet } from './network-helpers';
 import { logError } from './log-helpers';
@@ -1236,3 +1236,21 @@ export function withIdRemovedFromSchema(schema: VerifiableCredentialSchema) {
 
     return { ...schema, properties: schemaOuterPropertiesWithNoId };
 }
+
+/**
+ * BigInts do not validate against a json schema as being an integer. This pre validate function
+ * coerces any bigint values where { type: "integer" } into number, as that will ensure that
+ * they validate against the schema.
+ */
+export function coerceBigIntIntegerToNumber(
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    instance: any,
+    key: string,
+    schema: Schema
+) {
+    const value = instance[key];
+    if (schema.type && schema.type === 'integer' && typeof value === 'bigint') {
+        // eslint-disable-next-line no-param-reassign
+        instance[key] = Number(value);
+    }
+}

packages/browser-wallet/test/verifiable-credential-helpers.test.ts

@@ -1,3 +1,4 @@
+import { Schema, Validator } from 'jsonschema';
 import {
     RevocationDataHolder,
     RevokeCredentialHolderParam,
@@ -13,6 +14,7 @@ import {
     getCredentialIdFromSubjectDID,
     getContractAddressFromIssuerDID,
     getVerifiableCredentialPublicKeyfromSubjectDID,
+    coerceBigIntIntegerToNumber,
 } from '../src/shared/utils/verifiable-credential-helpers';
 import { mainnet, testnet } from '../src/shared/constants/networkConfiguration';
 
@@ -184,3 +186,21 @@ test('getCredentialIdFromSubjectDID extracts credId without network', () => {
         'aad98095db73b5b22f7f64823a495c6c57413947353646313dc453fa4604715d2f93b2c1f8cb4c9625edd6330e1d27fa'
     );
 });
+
+test('bigint with type integer validates against schema when coercing in pre validate', () => {
+    const validator = new Validator();
+    const schema: Schema = {
+        type: 'object',
+        properties: {
+            age: { type: 'integer' },
+        },
+    };
+
+    const p = {
+        age: BigInt(97),
+    };
+
+    const validationResult = validator.validate(p, schema, { preValidateProperty: coerceBigIntIntegerToNumber });
+
+    expect(validationResult.valid).toBeTruthy();
+});