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

static PREFIX: &str = "apikey-";

#[derive(Debug, Clone, PartialEq, Copy)]
pub struct ApiKeyId {
    pub id: uuid::Uuid,
}

impl Default for ApiKeyId {
    fn default() -> Self {
        Self {
            id: uuid::Uuid::now_v7(),
        }
    }
}

impl std::fmt::Display for ApiKeyId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(&format!("{PREFIX}{}", self.id))
    }
}

impl<'de> serde::Deserialize<'de> for ApiKeyId {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        struct ApiKeyIdVisitor;

        impl<'de> serde::de::Visitor<'de> for ApiKeyIdVisitor {
            type Value = ApiKeyId;

            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
                formatter.write_str("a string starting with 'apikey-' followed by a UUID")
            }

            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
            where
                E: serde::de::Error,
            {
                if let Some(uuid_str) = value.strip_prefix(PREFIX) {
                    let uuid = uuid::Uuid::parse_str(uuid_str).map_err(E::custom)?;
                    Ok(ApiKeyId { id: uuid })
                } else {
                    Err(E::custom("invalid format"))
                }
            }
        }

        deserializer.deserialize_str(ApiKeyIdVisitor)
    }
}

impl serde::Serialize for ApiKeyId {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        serializer.serialize_str(&self.to_string())
    }
}

impl From<uuid::Uuid> for ApiKeyId {
    fn from(id: uuid::Uuid) -> Self {
        ApiKeyId { id }
    }
}

impl TryFrom<&str> for ApiKeyId {
    type Error = String;

    fn try_from(value: &str) -> Result<Self, Self::Error> {
        if let Some(uuid_str) = value.strip_prefix(PREFIX) {
            let uuid =
                uuid::Uuid::parse_str(uuid_str).map_err(|_e| "invalid format".to_string())?;
            Ok(ApiKeyId { id: uuid })
        } else {
            Err("invalid format".to_string())
        }
    }
}

#[test]
fn key_invalid_1() {
    let k = "abc-dsfdg";
    let apikey: Result<ApiKeyId, String> = ApiKeyId::try_from(k);
    assert!(apikey.is_err())
}

#[test]
fn key_invalid_2() {
    let k = "apikey-dsfdg";
    let apikey: Result<ApiKeyId, String> = ApiKeyId::try_from(k);
    assert!(apikey.is_err())
}

#[test]
fn key_valid_1() {
    let k = "apikey-0190c589-eb70-7980-97cf-af67b3a84116";
    let apikey: Result<ApiKeyId, String> = ApiKeyId::try_from(k);
    assert!(apikey.is_ok())
}

#[test]
fn key_invalid_3() {
    let k = "abc-0190c589-eb70-7980-97cf-af67b3a84116";
    let apikey: Result<ApiKeyId, String> = ApiKeyId::try_from(k);
    assert!(apikey.is_err())
}