rebase 0.1.6

Rebase is a library for witnessing cryptographic attestations and issuing verifiable credentials
Documentation 
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
138
139

use crate::types::{defs::Statement, error::StatementError};
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use serde_json::{Map, Value};
pub use siwe_recap::Capability as RecapCapability;
use std::collections::HashMap;
use strum::EnumIter;
use tsify::Tsify;
use wasm_bindgen::prelude::*;

pub trait Attestation {
    fn to_statement(&self) -> Result<(AttestationTypes, Map<String, Value>), StatementError>;
}

impl<T: Attestation> Statement for T {
    fn generate_statement(&self) -> Result<String, StatementError> {
        let (t, content) = self.to_statement()?;
        t.validate(&content)?;
        let mut v: Vec<String> = Vec::new();
        for k in content.keys() {
            match content.get(k) {
                None => {
                    return Err(StatementError::Statement(format!(
                        "Could not find entry {} in content",
                        k
                    )))
                }
                Some(val) => {
                    let s = format!("{}:{}", k, val);
                    v.push(s);
                }
            }
        }
        v.sort();
        // NOTE: If supporting languages beyond english, add checks for language code
        // and generate the statement header here!
        v.insert(
            0,
            "Sign a copy of your data to turn it into a Verifiable Credential:\n".to_string(),
        );

        Ok(v.join("\n"))
    }
}

#[derive(Clone, Debug, Deserialize, EnumIter, JsonSchema, Serialize, Tsify, PartialEq)]
#[tsify(into_wasm_abi, from_wasm_abi)]
pub enum AttestationTypes {
    BasicImageAttestation,
    BasicPostAttestation,
    BasicProfileAttestation,
    BasicTagAttestation,
    BookReviewAttestation,
    DappPreferencesAttestation,
    FollowAttestation,
    LikeAttestation,
    ProgressBookLinkAttestation,
}

impl AttestationTypes {
    // Returns a map of keys in the content, along with a boolean for if they are optional.
    pub fn to_key_map(&self) -> HashMap<String, bool> {
        match &self {
            AttestationTypes::BasicImageAttestation => {
                HashMap::from([("id".to_string(), true), ("src".to_string(), true)])
            }
            AttestationTypes::BasicPostAttestation => HashMap::from([
                ("body".to_string(), true),
                ("id".to_string(), true),
                // TODO: Determine if title should be optional.
                ("title".to_string(), true),
                ("reply_to".to_string(), false),
            ]),
            AttestationTypes::BasicProfileAttestation => HashMap::from([
                ("description".to_string(), false),
                ("id".to_string(), true),
                ("image".to_string(), false),
                ("username".to_string(), true),
                ("website".to_string(), false),
            ]),
            AttestationTypes::BasicTagAttestation => HashMap::from([
                ("id".to_string(), true),
                ("users".to_string(), true),
                ("post".to_string(), true),
            ]),
            AttestationTypes::BookReviewAttestation => HashMap::from([
                ("id".to_string(), true),
                ("link".to_string(), true),
                ("rating".to_string(), true),
                ("review".to_string(), true),
                ("title".to_string(), true),
            ]),
            AttestationTypes::DappPreferencesAttestation => {
                HashMap::from([("id".to_string(), true), ("dark_mode".to_string(), true)])
            }
            AttestationTypes::FollowAttestation => {
                HashMap::from([("id".to_string(), true), ("target".to_string(), true)])
            }
            AttestationTypes::LikeAttestation => {
                HashMap::from([("id".to_string(), true), ("target".to_string(), true)])
            }
            AttestationTypes::ProgressBookLinkAttestation => HashMap::from([
                ("id".to_string(), true),
                ("link".to_string(), true),
                ("progress".to_string(), true),
            ]),
        }
    }

    pub fn validate(&self, content: &Map<String, Value>) -> Result<(), StatementError> {
        let h = self.to_key_map();
        for expected_key in h.keys() {
            match h.get(expected_key) {
                None => {
                    return Err(StatementError::Statement("Should be impossible, could not find entry in HashMap even though the key was found by iterating over the HashMap, good luck with this error".to_string()))
                }
                Some(b) => {
                    if *b && content.get(expected_key).is_none() {
                        return Err(StatementError::Statement(format!(
                            "Could not find required entry {}",
                            expected_key
                        )));
                    }
                }
            };
        }

        for expected_key in content.keys() {
            if h.get(expected_key).is_none() {
                return Err(StatementError::Statement(format!(
                    "Found unknown key in content: {}",
                    expected_key
                )));
            };
        }

        Ok(())
    }
}