1  // Copyright (c) 2019-2025 Alpha-Delta Network Inc.
 2  // This file is part of the deltavm library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use super::*;
17  
18  static GRAPH_KEY_PREFIX: [u8; 9] = [42, 72, 193, 144, 65, 126, 212, 229, 211]; // AGraphKey1
19  
20  impl<N: Network> FromStr for GraphKey<N> {
21      type Err = Error;
22  
23      /// Reads in an account graph key from a base58 string.
24      fn from_str(s: &str) -> Result<Self, Self::Err> {
25          // Encode the string into base58.
26          let data = bs58::decode(s).into_vec().map_err(|err| anyhow!("{err:?}"))?;
27          if data.len() != 41 {
28              bail!("Invalid account graph key length: found {}, expected 41", data.len())
29          } else if data[0..9] != GRAPH_KEY_PREFIX {
30              bail!("Invalid account graph key prefix: found {:?}, expected {:?}", &data[0..9], GRAPH_KEY_PREFIX)
31          }
32          // Output the graph key.
33          Self::try_from(Field::read_le(&data[9..41])?)
34      }
35  }
36  
37  impl<N: Network> fmt::Display for GraphKey<N> {
38      /// Writes the account graph key as a base58 string.
39      fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
40          // Write the graph key bytes.
41          let mut graph_key = [0u8; 41];
42          graph_key[0..9].copy_from_slice(&GRAPH_KEY_PREFIX);
43          self.sk_tag.write_le(&mut graph_key[9..41]).map_err(|_| fmt::Error)?;
44          // Encode the graph key into base58.
45          write!(f, "{}", bs58::encode(graph_key).into_string())
46      }
47  }
48  
49  #[cfg(test)]
50  mod tests {
51      use super::*;
52      use crate::PrivateKey;
53      use deltavm_console_network::MainnetV0;
54  
55      type CurrentNetwork = MainnetV0;
56  
57      const ITERATIONS: u64 = 10_000;
58  
59      #[test]
60      fn test_string() -> Result<()> {
61          let mut rng = TestRng::default();
62  
63          for _ in 0..ITERATIONS {
64              // Sample a new graph key.
65              let private_key = PrivateKey::<CurrentNetwork>::new(&mut rng)?;
66              let view_key = ViewKey::try_from(private_key)?;
67              let expected = GraphKey::try_from(view_key)?;
68  
69              // Check the string representation.
70              let candidate = format!("{expected}");
71              assert_eq!(expected, GraphKey::from_str(&candidate)?);
72              assert_eq!("AGraphKey", candidate.split('1').next().unwrap());
73          }
74          Ok(())
75      }
76  }