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

use schemars::JsonSchema;
use std::fmt;
use thiserror::Error;

use cosmwasm_schema::cw_serde;
use cosmwasm_std::{
    attr, Addr, CustomQuery, Deps, DepsMut, MessageInfo, Response, StdError, StdResult, Storage,
    SubMsg,
};
use cw_storage_plus::Item;

use crate::admin::{Admin, AdminError};

// this is copied from cw4
// TODO: pull into utils as common dep
#[cw_serde]
pub struct HooksResponse {
    pub hooks: Vec<String>,
}

#[derive(Error, Debug, PartialEq)]
pub enum HookError {
    #[error("{0}")]
    Std(#[from] StdError),

    #[error("{0}")]
    Admin(#[from] AdminError),

    #[error("Given address already registered as a hook")]
    HookAlreadyRegistered {},

    #[error("Given address not registered as a hook")]
    HookNotRegistered {},
}

// store all hook addresses in one item. We cannot have many of them before the contract becomes unusable anyway.
pub struct Hooks<'a>(Item<'a, Vec<Addr>>);

impl<'a> Hooks<'a> {
    pub const fn new(storage_key: &'a str) -> Self {
        Hooks(Item::new(storage_key))
    }

    pub fn add_hook(&self, storage: &mut dyn Storage, addr: Addr) -> Result<(), HookError> {
        let mut hooks = self.0.may_load(storage)?.unwrap_or_default();
        if !hooks.iter().any(|h| h == &addr) {
            hooks.push(addr);
        } else {
            return Err(HookError::HookAlreadyRegistered {});
        }
        Ok(self.0.save(storage, &hooks)?)
    }

    pub fn remove_hook(&self, storage: &mut dyn Storage, addr: Addr) -> Result<(), HookError> {
        let mut hooks = self.0.load(storage)?;
        if let Some(p) = hooks.iter().position(|x| x == &addr) {
            hooks.remove(p);
        } else {
            return Err(HookError::HookNotRegistered {});
        }
        Ok(self.0.save(storage, &hooks)?)
    }

    pub fn prepare_hooks<F: Fn(Addr) -> StdResult<SubMsg>>(
        &self,
        storage: &dyn Storage,
        prep: F,
    ) -> StdResult<Vec<SubMsg>> {
        self.0
            .may_load(storage)?
            .unwrap_or_default()
            .into_iter()
            .map(prep)
            .collect()
    }

    pub fn execute_add_hook<C, Q: CustomQuery>(
        &self,
        admin: &Admin,
        deps: DepsMut<Q>,
        info: MessageInfo,
        addr: Addr,
    ) -> Result<Response<C>, HookError>
    where
        C: Clone + fmt::Debug + PartialEq + JsonSchema,
    {
        admin.assert_admin(deps.as_ref(), &info.sender)?;
        self.add_hook(deps.storage, addr.clone())?;

        let attributes = vec![
            attr("action", "add_hook"),
            attr("hook", addr),
            attr("sender", info.sender),
        ];
        Ok(Response::new().add_attributes(attributes))
    }

    pub fn execute_remove_hook<C, Q: CustomQuery>(
        &self,
        admin: &Admin,
        deps: DepsMut<Q>,
        info: MessageInfo,
        addr: Addr,
    ) -> Result<Response<C>, HookError>
    where
        C: Clone + fmt::Debug + PartialEq + JsonSchema,
    {
        admin.assert_admin(deps.as_ref(), &info.sender)?;
        self.remove_hook(deps.storage, addr.clone())?;

        let attributes = vec![
            attr("action", "remove_hook"),
            attr("hook", addr),
            attr("sender", info.sender),
        ];
        Ok(Response::new().add_attributes(attributes))
    }

    pub fn query_hooks<Q: CustomQuery>(&self, deps: Deps<Q>) -> StdResult<HooksResponse> {
        let hooks = self.0.may_load(deps.storage)?.unwrap_or_default();
        let hooks = hooks.into_iter().map(String::from).collect();
        Ok(HooksResponse { hooks })
    }

    // Return true if hook is in hooks
    pub fn query_hook<Q: CustomQuery>(&self, deps: Deps<Q>, hook: String) -> StdResult<bool> {
        Ok(self.query_hooks(deps)?.hooks.into_iter().any(|h| h == hook))
    }
}

// TODO: add test coverage