support nested claims (#153)

Signed-off-by: Johannes Tuerk <johannes.tuerk@lissi.id>

Author: JoTiTu

src/WalletFramework.Oid4Vc/Oid4Vci/Implementations/SdJwtRecordExtensions.cs

@@ -1,10 +1,12 @@
 using System.Drawing;
+using Microsoft.IdentityModel.Tokens;
 using SD_JWT.Models;
 using WalletFramework.Core.Cryptography.Models;
 using WalletFramework.Core.Functional;
 using WalletFramework.Oid4Vc.Oid4Vci.CredConfiguration.Models.SdJwt;
 using WalletFramework.Oid4Vc.Oid4Vci.Issuer.Models;
 using WalletFramework.SdJwtVc.Models.Credential;
+using WalletFramework.SdJwtVc.Models.Credential.Attributes;
 using WalletFramework.SdJwtVc.Models.Records;
 
 namespace WalletFramework.Oid4Vc.Oid4Vci.Implementations;
@@ -19,9 +21,22 @@ public static SdJwtRecord ToRecord(
     {
         var claims = configuration
             .Claims?
-            .Select(pair => (pair.Key, pair.Value))
-            .ToDictionary(pair => pair.Key, pair => pair.Value);
+            .SelectMany(claimMetadata => 
+            {
+                var claimMetadatas = new Dictionary<string, ClaimMetadata> { { claimMetadata.Key, claimMetadata.Value } };
 
+                if (!claimMetadata.Value.NestedClaims.IsNullOrEmpty())
+                {
+                    foreach (var nested in claimMetadata.Value.NestedClaims!)
+                    {
+                        claimMetadatas.Add(claimMetadata.Key + "." + nested.Key, nested.Value?.ToObject<ClaimMetadata>()!);
+                    }
+                }
+                
+                return claimMetadatas;
+            })
+            .ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
+        
         var display = configuration
             .CredentialConfiguration
             .Display
@@ -52,7 +67,7 @@ public static SdJwtRecord ToRecord(
             .ToDictionary(
                  issuerDisplay => issuerDisplay.Locale.ToNullable()?.ToString(),
                  issuerDisplay => issuerDisplay.Name.ToNullable()?.ToString());
-
+        
         var record = new SdJwtRecord(
             sdJwtDoc,
             claims!,

src/WalletFramework.Oid4Vc/Oid4Vci/Models/Metadata/Credential/Attributes/OidClaim.cs

@@ -1,4 +1,5 @@
 using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 
 namespace WalletFramework.Oid4Vc.Oid4Vci.Models.Metadata.Credential.Attributes;
 
@@ -30,4 +31,8 @@ public class OidClaim
     /// </summary>
     [JsonProperty("mandatory", NullValueHandling = NullValueHandling.Ignore)]
     public string? Mandatory { get; set; }
-}
+    
+    [JsonProperty("nested_claims", NullValueHandling = NullValueHandling.Ignore)]
+    [JsonExtensionData]
+    public Dictionary<string, JToken>? NestedClaims { get; set; }
+}

src/WalletFramework.SdJwtVc/Models/Credential/Attributes/ClaimMetadata.cs

@@ -1,34 +1,38 @@
 using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 
-namespace WalletFramework.SdJwtVc.Models.Credential.Attributes
-{
+namespace WalletFramework.SdJwtVc.Models.Credential.Attributes;
+
+/// <summary>
+///     Represents the specifics about a claim.
+/// </summary>
+public class ClaimMetadata   {
     /// <summary>
-    ///     Represents the specifics about a claim.
+    ///     Gets or sets the list of display properties associated with a specific credential attribute.
     /// </summary>
-    public class ClaimMetadata
-    {
-        /// <summary>
-        ///     Gets or sets the list of display properties associated with a specific credential attribute.
-        /// </summary>
-        /// <value>
-        ///     The list of display properties. Each display property provides information on how the credential attribute should
-        ///     be displayed.
-        /// </value>
-        [JsonProperty("display", NullValueHandling = NullValueHandling.Ignore)]
-        public List<ClaimDisplay>? Display { get; set; }
+    /// <value>
+    ///     The list of display properties. Each display property provides information on how the credential attribute should
+    ///     be displayed.
+    /// </value>
+    [JsonProperty("display", NullValueHandling = NullValueHandling.Ignore)]
+    public List<ClaimDisplay>? Display { get; set; }
 
-        /// <summary>
-        ///     String value determining type of value of the claim. A non-exhaustive list of valid values defined by this
-        ///     specification are string, number, and image media types such as image/jpeg.
-        /// </summary>
-        [JsonProperty("value_type", NullValueHandling = NullValueHandling.Ignore)]
-        public string? ValueType { get; set; }
-        
-        /// <summary>
-        ///     String value determining type of value of the claim. A non-exhaustive list of valid values defined by this
-        ///     specification are string, number, and image media types such as image/jpeg.
-        /// </summary>
-        [JsonProperty("mandatory", NullValueHandling = NullValueHandling.Ignore)]
-        public string? Mandatory { get; set; }
-    }
+    /// <summary>
+    ///     String value determining type of value of the claim. A non-exhaustive list of valid values defined by this
+    ///     specification are string, number, and image media types such as image/jpeg.
+    /// </summary>
+    [JsonProperty("value_type", NullValueHandling = NullValueHandling.Ignore)]
+    public string? ValueType { get; set; }
+    
+    /// <summary>
+    ///     String value determining type of value of the claim. A non-exhaustive list of valid values defined by this
+    ///     specification are string, number, and image media types such as image/jpeg.
+    /// </summary>
+    [JsonProperty("mandatory", NullValueHandling = NullValueHandling.Ignore)]
+    public string? Mandatory { get; set; }
+    
+    [JsonProperty("nested_claims", NullValueHandling = NullValueHandling.Ignore)]
+    [JsonExtensionData]
+    public Dictionary<string, JToken>? NestedClaims { get; set; }
 }
+