1- using System . Text ;
2- using System . Text . Json ;
3- using NBitcoin . Secp256k1 ;
4- using PeterO . Cbor ;
5-
6- namespace DotNut ;
1+ namespace DotNut ;
72
83public static class CashuTokenHelper
94{
@@ -64,127 +59,4 @@ public static CashuToken Decode(string token, out string? version)
6459 token = token . Substring ( 1 ) ;
6560 return encoder . Decode ( token ) ;
6661 }
67- }
68-
69- public interface ICashuTokenEncoder
70- {
71- string Encode ( CashuToken token ) ;
72- CashuToken Decode ( string token ) ;
73- }
74-
75- public class CashuTokenV3Encoder : ICashuTokenEncoder
76- {
77- public string Encode ( CashuToken token )
78- {
79- var json = JsonSerializer . Serialize ( token ) ;
80- return Base64UrlSafe . Encode ( Encoding . UTF8 . GetBytes ( json ) ) ;
81- }
82-
83- public CashuToken Decode ( string token )
84- {
85- var json = Encoding . UTF8 . GetString ( Base64UrlSafe . Decode ( token ) ) ;
86- return JsonSerializer . Deserialize < CashuToken > ( json ) ! ;
87- }
88- }
89-
90- public class CashuTokenV4Encoder : ICashuTokenEncoder , ICBORToFromConverter < CashuToken >
91- {
92- public string Encode ( CashuToken token )
93- {
94- var obj = ToCBORObject ( token ) ;
95- return Base64UrlSafe . Encode ( obj . EncodeToBytes ( ) ) ;
96- }
97-
98- public CashuToken Decode ( string token )
99- {
100- var obj = CBORObject . DecodeFromBytes ( Base64UrlSafe . Decode ( token ) ) ;
101- return FromCBORObject ( obj ) ;
102- }
103-
104- public CBORObject ToCBORObject ( CashuToken token )
105- {
106- //ensure that all token mints are the same
107- var mints = token . Tokens . Select ( token1 => token1 . Mint ) . ToArray ( ) ;
108- if ( mints . Distinct ( ) . Count ( ) != 1 )
109- throw new FormatException ( "All proofs must have the same mint in v4 tokens" ) ;
110- var proofSets = CBORObject . NewArray ( ) ;
111- foreach ( var proofSet in token . Tokens . SelectMany ( token1 => token1 . Proofs ) . GroupBy ( proof => proof . Id ) )
112- {
113- var proofSetItem = CBORObject . NewOrderedMap ( ) ;
114- proofSetItem . Add ( "i" , Convert . FromHexString ( proofSet . Key . ToString ( ) ) ) ;
115- var proofSetItemArray = CBORObject . NewArray ( ) ;
116- foreach ( var proof in proofSet )
117- {
118- var proofItem = CBORObject . NewOrderedMap ( )
119- . Add ( "a" , proof . Amount )
120- . Add ( "s" , Encoding . UTF8 . GetString ( proof . Secret . GetBytes ( ) ) )
121- . Add ( "c" , proof . C . Key . ToBytes ( ) ) ;
122- if ( proof . DLEQ is not null )
123- {
124- proofItem . Add ( "d" , CBORObject
125- . NewOrderedMap ( )
126- . Add ( "e" , proof . DLEQ . E . Key . ToBytes ( ) )
127- . Add ( "s" , proof . DLEQ . S . Key . ToBytes ( ) )
128- . Add ( "r" , proof . DLEQ . R . Key . ToBytes ( ) ) ) ;
129- }
130-
131- if ( proof . Witness is not null )
132- {
133- proofItem . Add ( "w" , proof . Witness ) ;
134- }
135-
136- proofSetItemArray . Add ( proofItem ) ;
137- }
138-
139- proofSetItem . Add ( "p" , proofSetItemArray ) ;
140- proofSets . Add ( proofSetItem ) ;
141- }
142-
143- var cbor = CBORObject . NewOrderedMap ( ) ;
144-
145-
146- if ( token . Memo is not null )
147- cbor . Add ( "d" , token . Memo ) ;
148- cbor . Add ( "t" , proofSets )
149- . Add ( "m" , mints . First ( ) )
150- . Add ( "u" , token . Unit ! ) ;
151- return cbor ;
152- }
153-
154- public CashuToken FromCBORObject ( CBORObject obj )
155- {
156- return new CashuToken
157- {
158- Unit = obj [ "u" ] . AsString ( ) ,
159- Memo = obj . GetOrDefault ( "d" , null ) ? . AsString ( ) ,
160- Tokens =
161- [
162- new CashuToken . Token ( )
163- {
164- Mint = obj [ "m" ] . AsString ( ) ,
165- Proofs = obj [ "t" ] . Values . SelectMany ( proofSet =>
166- {
167- var id = new KeysetId ( Convert . ToHexString ( proofSet [ "i" ] . GetByteString ( ) ) . ToLowerInvariant ( ) ) ;
168-
169- return proofSet [ "p" ] . Values . Select ( proof => new Proof ( )
170- {
171- Amount = proof [ "a" ] . AsInt32 ( ) ,
172- Secret = JsonSerializer . Deserialize < ISecret > ( proof [ "s" ] . ToJSONString ( ) ) ! ,
173- C = ECPubKey . Create ( proof [ "c" ] . GetByteString ( ) ) ,
174- Witness = proof . GetOrDefault ( "w" , null ) ? . AsString ( ) ,
175- DLEQ = proof . GetOrDefault ( "d" , null ) is { } cborDLEQ
176- ? new DLEQProof
177- {
178- E = ECPrivKey . Create ( cborDLEQ [ "e" ] . GetByteString ( ) ) ,
179- S = ECPrivKey . Create ( cborDLEQ [ "s" ] . GetByteString ( ) ) ,
180- R = ECPrivKey . Create ( cborDLEQ [ "r" ] . GetByteString ( ) )
181- }
182- : null ,
183- Id = id
184- } ) ;
185- } ) . ToList ( )
186- }
187- ]
188- } ;
189- }
19062}
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