1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
use std::collections::HashMap;
use serde::{Deserialize, Serialize};
use crate::{ids::short, key, secp256k1fx};
#[derive(Debug, Serialize, Deserialize, Eq, PartialEq, Clone)]
pub struct Keychain<T: key::ReadOnly + key::SignOnly> {
pub keys: Vec<T>,
pub short_addr_to_key_index: HashMap<short::Id, u32>,
}
impl<T> Keychain<T>
where
T: key::ReadOnly + key::SignOnly + Clone,
{
pub fn new(keys: Vec<T>) -> Self {
let mut short_addr_to_key_index = HashMap::new();
for (pos, k) in keys.iter().enumerate() {
short_addr_to_key_index.insert(k.get_short_address(), pos as u32);
}
Self {
keys,
short_addr_to_key_index,
}
}
pub fn get(&self, short_addr: &short::Id) -> Option<T> {
self.short_addr_to_key_index
.get(short_addr)
.map(|k| self.keys[(*k) as usize].clone())
}
pub fn match_threshold(
&self,
output_owners: &secp256k1fx::OutputOwners,
time: u64,
) -> Option<(Vec<u32>, Vec<T>)> {
if output_owners.locktime > time {
return None;
}
let mut sig_indices: Vec<u32> = Vec::new();
let mut keys: Vec<T> = Vec::new();
for (pos, addr) in output_owners.addrs.iter().enumerate() {
let key = self.get(addr);
if key.is_none() {
continue;
}
sig_indices.push(pos as u32);
keys.push(key.unwrap());
if (keys.len() as u32) == output_owners.threshold {
break;
}
}
let n = keys.len();
if (n as u32) == output_owners.threshold {
Some((sig_indices, keys))
} else {
None
}
}
pub fn spend(
&self,
output: &secp256k1fx::TransferOutput,
time: u64,
) -> Option<(secp256k1fx::TransferInput, Vec<T>)> {
let res = self.match_threshold(&output.output_owners, time);
let threshold_met = res.is_some();
if !threshold_met {
return None;
}
let (sig_indices, keys) = res.unwrap();
Some((
secp256k1fx::TransferInput {
amount: output.amount,
sig_indices,
},
keys,
))
}
}