[Neo Core StdLib] Add Base64url (#3453)

* add base64url

* active in

* update placehold hf height

* fix hf issue and move methods to proper place.

* fix test

* use identifymodel instead.

src/Neo.CLI/config.fs.mainnet.json

@@ -41,7 +41,7 @@
       "HF_Basilisk": 4500000,
       "HF_Cockatrice": 5800000,
       "HF_Domovoi": 5800000,
-      "HF_Echidna": 0
+      "HF_Echidna": 5800001
     },
     "StandbyCommittee": [
       "026fa34ec057d74c2fdf1a18e336d0bd597ea401a0b2ad57340d5c220d09f44086",

src/Neo.CLI/config.json

@@ -39,7 +39,7 @@
       "HF_Basilisk": 4120000,
       "HF_Cockatrice": 5450000,
       "HF_Domovoi": 5570000,
-      "HF_Echidna": 0
+      "HF_Echidna": 5570001
     },
     "InitialGasDistribution": 5200000000000000,
     "ValidatorsCount": 7,

src/Neo.CLI/config.mainnet.json

@@ -39,7 +39,7 @@
       "HF_Basilisk": 4120000,
       "HF_Cockatrice": 5450000,
       "HF_Domovoi": 5570000,
-      "HF_Echidna": 0
+      "HF_Echidna": 5570001
     },
     "InitialGasDistribution": 5200000000000000,
     "ValidatorsCount": 7,

src/Neo.CLI/config.testnet.json

@@ -39,7 +39,7 @@
       "HF_Basilisk": 2680000,
       "HF_Cockatrice": 3967000,
       "HF_Domovoi": 4144000,
-      "HF_Echidna": 0
+      "HF_Echidna": 4144001
     },
     "InitialGasDistribution": 5200000000000000,
     "ValidatorsCount": 7,

src/Neo/Neo.csproj

@@ -16,6 +16,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
+    <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="8.0.1" />
   </ItemGroup>
 
   <ItemGroup>

src/Neo/SmartContract/Native/StdLib.cs

@@ -11,6 +11,7 @@
 
 #pragma warning disable IDE0051
 
+using Microsoft.IdentityModel.Tokens;
 using Neo.Cryptography;
 using Neo.Json;
 using Neo.VM.Types;
@@ -131,6 +132,28 @@ public static byte[] Base64Decode([MaxLength(MaxInputLength)] string s)
             return Convert.FromBase64String(s);
         }
 
+        /// <summary>
+        /// Encodes a byte array into a base64Url string.
+        /// </summary>
+        /// <param name="data">The base64Url to be encoded.</param>
+        /// <returns>The encoded base64Url string.</returns>
+        [ContractMethod(Hardfork.HF_Echidna, CpuFee = 1 << 5)]
+        public static string Base64UrlEncode([MaxLength(MaxInputLength)] string data)
+        {
+            return Base64UrlEncoder.Encode(data);
+        }
+
+        /// <summary>
+        /// Decodes a byte array from a base64Url string.
+        /// </summary>
+        /// <param name="s">The base64Url string.</param>
+        /// <returns>The decoded base64Url string.</returns>
+        [ContractMethod(Hardfork.HF_Echidna, CpuFee = 1 << 5)]
+        public static string Base64UrlDecode([MaxLength(MaxInputLength)] string s)
+        {
+            return Base64UrlEncoder.Decode(s);
+        }
+
         /// <summary>
         /// Encodes a byte array into a base58 <see cref="string"/>.
         /// </summary>

tests/Neo.UnitTests/SmartContract/Native/UT_StdLib.cs

@@ -406,5 +406,25 @@ public void TestRuntime_Deserialize()
             Assert.AreEqual(engine.ResultStack.Pop<Integer>().GetInteger(), 100);
             Assert.AreEqual(engine.ResultStack.Pop<ByteString>().GetString(), "test");
         }
+
+        [TestMethod]
+        public void TestBase64Url()
+        {
+            var snapshotCache = TestBlockchain.GetTestSnapshotCache();
+            using (var script = new ScriptBuilder())
+            {
+                // Test encoding
+                script.EmitDynamicCall(NativeContract.StdLib.Hash, "base64UrlEncode", "[email protected]&Issuer=https://example.com");
+                script.EmitDynamicCall(NativeContract.StdLib.Hash, "base64UrlDecode", "U3ViamVjdD10ZXN0QGV4YW1wbGUuY29tJklzc3Vlcj1odHRwczovL2V4YW1wbGUuY29t");
+
+                using var engine = ApplicationEngine.Create(TriggerType.Application, null, snapshotCache, settings: TestBlockchain.TheNeoSystem.Settings);
+                engine.LoadScript(script.ToArray());
+
+                Assert.AreEqual(engine.Execute(), VMState.HALT);
+                Assert.AreEqual(2, engine.ResultStack.Count);
+                Assert.AreEqual("[email protected]&Issuer=https://example.com", engine.ResultStack.Pop<ByteString>());
+                Assert.AreEqual("U3ViamVjdD10ZXN0QGV4YW1wbGUuY29tJklzc3Vlcj1odHRwczovL2V4YW1wbGUuY29t", engine.ResultStack.Pop<ByteString>().GetString());
+            }
+        }
     }
 }