feat: CID v1 default encoding is base32 #78

BREAKING CHANGE: The default was base58btc, it is now base32.
go-ipfs v0.4.21 has implemented this.

Author: richardschneider

src/Cid.cs

@@ -73,6 +73,10 @@ void EnsureMutable()
         ///   <item><description><see cref="Hash"/> algorithm name equals "sha2-256"</description></item>
         ///   </list>
         ///   </para>
+        ///   <para>
+        ///   </para>
+        ///   The default <see cref="Encoding"/> is "base32" when the
+        ///   <see cref="Version"/> is not zero.
         /// </remarks>
         public int Version
         {
@@ -83,6 +87,10 @@ public int Version
             set
             {
                 EnsureMutable();
+                if (version == 0 && value > 0 && Encoding == "base58btc")
+                {
+                    encoding = "base32";
+                }
                 version = value;
             }
         }
@@ -91,7 +99,7 @@ public int Version
         ///   The <see cref="MultiBase"/> encoding of the CID.
         /// </summary>
         /// <value>
-        ///   base58btc, base64, etc.  Defaults to <see cref="MultiBase.DefaultAlgorithmName"/>.
+        ///   base58btc, base32, base64, etc.  Defaults to <see cref="MultiBase.DefaultAlgorithmName"/>.
         /// </value>
         /// <remarks>
         ///    Sets <see cref="Version"/> to 1, when setting a value that
@@ -107,11 +115,11 @@ public string Encoding
             set
             {
                 EnsureMutable();
-                encoding = value;
                 if (Version == 0 && value != "base58btc")
                 {
                     Version = 1;
                 }
+                encoding = value;
             }
         }
 

test/CidTest.cs

@@ -41,7 +41,7 @@ public void MultiHash_is_Cid_V1()
             Cid cid = mh;
             Assert.AreEqual(1, cid.Version);
             Assert.AreEqual("dag-pb", cid.ContentType);
-            Assert.AreEqual("base58btc", cid.Encoding);
+            Assert.AreEqual("base32", cid.Encoding);
             Assert.AreSame(mh, cid.Hash);
         }
 
@@ -80,7 +80,9 @@ public void Encode_V1()
                 ContentType = "raw",
                 Hash = "QmaozNR7DZHQK1ZcU9p7QdrshMvXqWK6gpu5rmrkPdT3L4"
             };
-            Assert.AreEqual("zb2rhj7crUKTQYRGCRATFaQ6YFLTde2YzdqbbhAASkL9uRDXn", cid.Encode());
+            Assert.AreEqual(1, cid.Version);
+            Assert.AreEqual("base32", cid.Encoding);
+            Assert.AreEqual("bafkreifzjut3te2nhyekklss27nh3k72ysco7y32koao5eei66wof36n5e", cid.Encode());
         }
 
         [TestMethod]
@@ -93,7 +95,8 @@ public void Encode_Upgrade_to_V1_ContentType()
                 Hash = "QmaozNR7DZHQK1ZcU9p7QdrshMvXqWK6gpu5rmrkPdT3L4"
             };
             Assert.AreEqual(1, cid.Version);
-            Assert.AreEqual("zb2rhj7crUKTQYRGCRATFaQ6YFLTde2YzdqbbhAASkL9uRDXn", cid.Encode());
+            Assert.AreEqual("base32", cid.Encoding);
+            Assert.AreEqual("bafkreifzjut3te2nhyekklss27nh3k72ysco7y32koao5eei66wof36n5e", cid.Encode());
         }
 
         [TestMethod]
@@ -119,7 +122,8 @@ public void Encode_Upgrade_to_V1_Hash()
                 Hash = mh
             };
             Assert.AreEqual(1, cid.Version);
-            Assert.AreEqual("zBunRFxZVcKeu8wAbUg92z2JK6UukiL7EnPR1D6TZaQCsPpRe7KzcmioKFyi2oEZd9ffwpbKTib1pucMQrDyRnAdaqwbB", cid.Encode());
+            Assert.AreEqual("base32", cid.Encoding);
+            Assert.AreEqual("bafybgqfnbq34ghljwmk7hka7cpem3zybbffnsfzfxinq3qyztsuxcntbxaua23xx42hrgptcchrolkndcucelv3pc4eoarjbwdxagtylboxsm", cid.Encode());
         }
 
         [TestMethod]

test/DagNodeTest.cs

@@ -118,9 +118,7 @@ public void Hashing_Algorithm()
             var node = new DagNode(abc, null, "sha2-512");
             CollectionAssert.AreEqual(abc, node.DataBytes);
             Assert.AreEqual(0, node.Links.Count());
-            // Had to change the test, because sha2-512 always generates a CID V1.
-            // Assert.AreEqual("8Vv347foTHxpLZDdguzcTp7mjBmySjWK1VF36Je7io4ZKHo28fefMFr28LSv757yTcaRzn1dRqPB6WWFpYvbd5YXca", (string)node.Id);
-            Assert.AreEqual("zBunREkQwjzkZwU71RKBcv2n3XwkTehtzVLkeUPTKjtBDBs2pnGRHLcxt3bGqzX38BkuNom2bQquyPj5Fh7dBZV3UdXPU", (string)node.Id);
+            Assert.AreEqual("bafybgqdqrys7323fuivxoixir7nnsfqmsneuuseg6mkbmcjgj4xaq7suehcmbghv5sbtxu57ccnhqjggxx7iz5p77gkcrhv2i3pj3yhv7fi56", (string)node.Id);
             Assert.AreEqual(5, node.Size);
 
             RoundtripTest(node);