From 853b0cebc43e6879133cfe23550c133fff22f4da Mon Sep 17 00:00:00 2001
From: Bibash Shrestha <bibashshrestha@gmail.com>
Date: Thu, 3 Aug 2023 15:45:26 +0545
Subject: [PATCH] feat: Added resolver for did:web #1749 and deal with jwt and
 jsonLd

---
 .../helper_functions/helper_functions.dart    |  4 --
 .../cubit/credential_details_cubit.dart       | 28 +++++++-----
 lib/scan/cubit/scan_cubit.dart                |  4 +-
 packages/oidc4vc/lib/src/oidc4vc.dart         | 45 +++++++++++++++----
 4 files changed, 57 insertions(+), 24 deletions(-)

diff --git a/lib/app/shared/helper_functions/helper_functions.dart b/lib/app/shared/helper_functions/helper_functions.dart
index df4537b88..95d190a13 100644
--- a/lib/app/shared/helper_functions/helper_functions.dart
+++ b/lib/app/shared/helper_functions/helper_functions.dart
@@ -101,10 +101,6 @@ String getIssuerDid({required Uri uriToCheck}) {
   return did;
 }
 
-bool isEbsiIssuer(CredentialModel credentialModel) {
-  return credentialModel.issuer.startsWith('did:ebsi');
-}
-
 bool isPolygonssuer(CredentialModel credentialModel) {
   return credentialModel.issuer.contains('did:polygonid');
 }
diff --git a/lib/dashboard/home/tab_bar/credentials/detail/cubit/credential_details_cubit.dart b/lib/dashboard/home/tab_bar/credentials/detail/cubit/credential_details_cubit.dart
index 9ba831116..ca5bfd667 100644
--- a/lib/dashboard/home/tab_bar/credentials/detail/cubit/credential_details_cubit.dart
+++ b/lib/dashboard/home/tab_bar/credentials/detail/cubit/credential_details_cubit.dart
@@ -56,20 +56,28 @@ class CredentialDetailsCubit extends Cubit<CredentialDetailsState> {
       }
     }
 
-    if (isEbsiIssuer(item)) {
-      final issuerDid = item.data['issuer']! as String;
-
-      final encodedData = item.jwt!;
-
-      final Map<String, dynamic> header =
-          decodeHeader(jwtDecode: jwtDecode, token: encodedData);
-
-      final String issuerKid = jsonEncode(header['kid']);
+    if (item.jwt != null) {
+      /// issuer did
+      final issuerDid = item.issuer;
+
+      late final String issuerKid;
+      late final String encodedData;
+      if (item.issuer.startsWith('did:web')) {
+        issuerKid = item.data['proof']['verificationMethod'] as String;
+      } else if (item.issuer.startsWith('did:ebsi')) {
+        encodedData = item.jwt!;
+
+        final Map<String, dynamic> header =
+            decodeHeader(jwtDecode: jwtDecode, token: encodedData);
+        issuerKid = jsonEncode(header['kid']);
+      } else {
+        throw Exception();
+      }
 
       final VerificationType isVerified = await verifyEncodedData(
         issuerDid,
         issuerKid,
-        item.jwt!,
+        encodedData,
       );
 
       late CredentialStatus credentialStatus;
diff --git a/lib/scan/cubit/scan_cubit.dart b/lib/scan/cubit/scan_cubit.dart
index 674780932..d8f6e1706 100644
--- a/lib/scan/cubit/scan_cubit.dart
+++ b/lib/scan/cubit/scan_cubit.dart
@@ -219,8 +219,8 @@ class ScanCubit extends Cubit<ScanState> {
         final dynamic jsonCredential =
             credential is String ? jsonDecode(credential) : credential;
 
-        if (!isEbsiIssuer(credentialModel)) {
-          /// not verifying credential for did:ebsi issuer
+        if (credentialModel.jwt == null) {
+          /// not verifying credential for did:ebsi and did:web issuer
           log.i('verifying Credential');
 
           final vcStr = jsonEncode(jsonCredential);
diff --git a/packages/oidc4vc/lib/src/oidc4vc.dart b/packages/oidc4vc/lib/src/oidc4vc.dart
index c906449c4..d3feb8e25 100644
--- a/packages/oidc4vc/lib/src/oidc4vc.dart
+++ b/packages/oidc4vc/lib/src/oidc4vc.dart
@@ -282,15 +282,44 @@ class OIDC4VC {
 
   Future<Response<Map<String, dynamic>>> getDidDocument(String didKey) async {
     try {
-      final didDocument = await client.get<Map<String, dynamic>>(
-        'https://api-pilot.ebsi.eu/did-registry/v3/identifiers/$didKey',
-      );
-      return didDocument;
+      if (didKey.startsWith('did:ebsi')) {
+        final didDocument = await client.get<Map<String, dynamic>>(
+          'https://api-pilot.ebsi.eu/did-registry/v3/identifiers/$didKey',
+        );
+        return didDocument;
+      } else if (didKey.startsWith('did:web')) {
+        final url = didWebToUrl(didKey);
+        final didDocument = await client.get<Map<String, dynamic>>(url);
+        return didDocument;
+      } else {
+        throw Exception();
+      }
     } catch (e) {
       throw Exception(e);
     }
   }
 
+  String didWebToUrl(String didKey) {
+    if (!didKey.startsWith('did:web:')) {
+      throw const FormatException('Invalid DID format');
+    }
+
+    // Extract the path after 'did:web:'
+    final didPath = didKey.substring('did:web:'.length);
+
+    if (didPath.contains(':')) {
+      final parts = didPath.split(':');
+      final domain = parts[0];
+      final issuer = parts[1];
+
+      final url = 'https://$domain/$issuer/did.json';
+      return url;
+    } else {
+      final url = 'https://$didPath/.well-known/did.json';
+      return url;
+    }
+  }
+
   String readTokenEndPoint(
     Response<Map<String, dynamic>> openidConfigurationResponse,
   ) {
@@ -318,9 +347,10 @@ class OIDC4VC {
   ) {
     final jsonPath = JsonPath(r'$..verificationMethod');
     final data = (jsonPath.read(didDocumentResponse.data).first.value as List)
-      ..where(
-        (dynamic e) => e['id'].toString() == holderKid,
-      ).toList();
+        .where(
+          (dynamic e) => e['id'].toString() == holderKid,
+        )
+        .toList();
 
     final value = data.first['publicKeyJwk'];
 
@@ -418,7 +448,6 @@ class OIDC4VC {
 
         isVerified = await verifyJwt(jwt, publicKey);
       } else {
-        // create a JsonWebSignature from the encoded string
         final jws = JsonWebSignature.fromCompactSerialization(jwt);
 
         // create a JsonWebKey for verifying the signature