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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

/* This file is part of DarkFi (https://dark.fi)
 *
 * Copyright (C) 2020-2024 Dyne.org foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use darkfi_sdk::{
    crypto::{
        pasta_prelude::*, pedersen_commitment_u64, BaseBlind, PublicKey, ScalarBlind, SecretKey,
    },
    pasta::pallas,
};

use log::debug;
use rand::rngs::OsRng;

use darkfi::{
    zk::{halo2::Value, Proof, ProvingKey, Witness, ZkCircuit},
    zkas::ZkBinary,
    ClientFailed, Result,
};

use crate::{
    error::DaoError,
    model::{Dao, DaoBlindAggregateVote, DaoExecParams, DaoProposal, VecAuthCallCommit},
};

pub struct DaoExecCall {
    pub proposal: DaoProposal,
    pub dao: Dao,
    pub yes_vote_value: u64,
    pub all_vote_value: u64,
    pub yes_vote_blind: ScalarBlind,
    pub all_vote_blind: ScalarBlind,
    pub input_value: u64,
    pub input_value_blind: ScalarBlind,
    pub input_user_data_blind: BaseBlind,
    pub hook_dao_exec: pallas::Base,
    pub signature_secret: SecretKey,
}

impl DaoExecCall {
    pub fn make(
        self,
        exec_zkbin: &ZkBinary,
        exec_pk: &ProvingKey,
    ) -> Result<(DaoExecParams, Vec<Proof>)> {
        debug!(target: "contract::dao::client::exec", "build()");
        let mut proofs = vec![];

        let dao_proposer_limit = pallas::Base::from(self.dao.proposer_limit);
        let dao_quorum = pallas::Base::from(self.dao.quorum);
        let dao_approval_ratio_quot = pallas::Base::from(self.dao.approval_ratio_quot);
        let dao_approval_ratio_base = pallas::Base::from(self.dao.approval_ratio_base);

        let (dao_pub_x, dao_pub_y) = self.dao.public_key.xy();

        let dao_bulla = self.dao.to_bulla();
        if dao_bulla != self.proposal.dao_bulla {
            return Err(ClientFailed::VerifyError(DaoError::InvalidCalls.to_string()).into())
        }
        let proposal_bulla = self.proposal.to_bulla();

        let yes_vote_commit = pedersen_commitment_u64(self.yes_vote_value, self.yes_vote_blind);
        let yes_vote_commit_coords = yes_vote_commit.to_affine().coordinates().unwrap();

        let all_vote_commit = pedersen_commitment_u64(self.all_vote_value, self.all_vote_blind);
        let all_vote_commit_coords = all_vote_commit.to_affine().coordinates().unwrap();

        let proposal_auth_calls_commit = self.proposal.auth_calls.commit();

        let signature_public = PublicKey::from_secret(self.signature_secret);

        let prover_witnesses = vec![
            // proposal params
            Witness::Base(Value::known(proposal_auth_calls_commit)),
            Witness::Base(Value::known(pallas::Base::from(self.proposal.creation_blockwindow))),
            Witness::Base(Value::known(pallas::Base::from(self.proposal.duration_blockwindows))),
            Witness::Base(Value::known(self.proposal.user_data)),
            Witness::Base(Value::known(self.proposal.blind.inner())),
            // DAO params
            Witness::Base(Value::known(dao_proposer_limit)),
            Witness::Base(Value::known(dao_quorum)),
            Witness::Base(Value::known(dao_approval_ratio_quot)),
            Witness::Base(Value::known(dao_approval_ratio_base)),
            Witness::Base(Value::known(self.dao.gov_token_id.inner())),
            Witness::Base(Value::known(dao_pub_x)),
            Witness::Base(Value::known(dao_pub_y)),
            Witness::Base(Value::known(self.dao.bulla_blind.inner())),
            // votes
            Witness::Base(Value::known(pallas::Base::from(self.yes_vote_value))),
            Witness::Base(Value::known(pallas::Base::from(self.all_vote_value))),
            Witness::Scalar(Value::known(self.yes_vote_blind.inner())),
            Witness::Scalar(Value::known(self.all_vote_blind.inner())),
            // signature secret
            Witness::Base(Value::known(self.signature_secret.inner())),
        ];

        debug!(target: "contract::dao::client::exec", "proposal_bulla: {:?}", proposal_bulla);
        let public_inputs = vec![
            proposal_bulla.inner(),
            proposal_auth_calls_commit,
            *yes_vote_commit_coords.x(),
            *yes_vote_commit_coords.y(),
            *all_vote_commit_coords.x(),
            *all_vote_commit_coords.y(),
            signature_public.x(),
            signature_public.y(),
        ];
        //darkfi::zk::export_witness_json("proof/witness/exec.json", &prover_witnesses, &public_inputs);

        let circuit = ZkCircuit::new(prover_witnesses, exec_zkbin);
        let input_proof = Proof::create(exec_pk, &[circuit], &public_inputs, &mut OsRng)?;
        proofs.push(input_proof);

        let params = DaoExecParams {
            proposal_bulla,
            proposal_auth_calls: self.proposal.auth_calls,
            blind_total_vote: DaoBlindAggregateVote { yes_vote_commit, all_vote_commit },
            signature_public,
        };

        Ok((params, proofs))
    }
}