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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

use std::{
    fmt::{Display, Write},
    ops::Add,
};

use schemars::JsonSchema;
use serde::{de::Error, Deserialize, Serialize};
use thiserror::Error;

use crate::{
    segment::{DomainSegment, DomainSegmentError},
    FullyQualifiedDomainName,
};

#[derive(Error, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum PartiallyQualifiedDomainNameError {
    #[error("domain is fully qualified")]
    DomainIsFullyQualified,
    #[error("{0}")]
    SegmentError(#[from] DomainSegmentError),
}

#[derive(Clone, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct PartiallyQualifiedDomainName(Vec<DomainSegment>);

impl PartiallyQualifiedDomainName {
    pub fn iter(&self) -> impl Iterator<Item = &DomainSegment> + '_ {
        self.0.iter()
    }
}

impl FromIterator<DomainSegment> for PartiallyQualifiedDomainName {
    fn from_iter<T: IntoIterator<Item = DomainSegment>>(iter: T) -> Self {
        PartiallyQualifiedDomainName(iter.into_iter().collect())
    }
}

impl TryFrom<String> for PartiallyQualifiedDomainName {
    type Error = PartiallyQualifiedDomainNameError;

    fn try_from(value: String) -> Result<Self, Self::Error> {
        Self::try_from(value.as_str())
    }
}

impl TryFrom<&str> for PartiallyQualifiedDomainName {
    type Error = PartiallyQualifiedDomainNameError;

    fn try_from(value: &str) -> Result<Self, Self::Error> {
        if value.ends_with('.') {
            Err(PartiallyQualifiedDomainNameError::DomainIsFullyQualified)
        } else {
            let segments = Result::from_iter(value.split('.').map(DomainSegment::try_from))?;

            Ok(PartiallyQualifiedDomainName(segments))
        }
    }
}

impl Display for PartiallyQualifiedDomainName {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        for (index, segment) in self.0.iter().enumerate() {
            segment.fmt(f)?;
            if index != self.0.len() {
                f.write_char('.')?;
            }
        }

        Ok(())
    }
}

impl Add<&FullyQualifiedDomainName> for &PartiallyQualifiedDomainName {
    type Output = FullyQualifiedDomainName;

    fn add(self, rhs: &FullyQualifiedDomainName) -> Self::Output {
        FullyQualifiedDomainName::from_iter(self.0.iter().chain(rhs.iter()).cloned())
    }
}

impl Add for &PartiallyQualifiedDomainName {
    type Output = PartiallyQualifiedDomainName;

    fn add(self, rhs: &PartiallyQualifiedDomainName) -> Self::Output {
        PartiallyQualifiedDomainName::from_iter(self.0.iter().chain(rhs.iter()).cloned())
    }
}

impl AsRef<[DomainSegment]> for PartiallyQualifiedDomainName {
    fn as_ref(&self) -> &[DomainSegment] {
        self.0.as_ref()
    }
}

impl PartialEq<String> for PartiallyQualifiedDomainName {
    fn eq(&self, other: &String) -> bool {
        self.to_string().eq(other)
    }
}

impl PartialEq<str> for PartiallyQualifiedDomainName {
    fn eq(&self, other: &str) -> bool {
        self.to_string().eq(other)
    }
}

impl JsonSchema for PartiallyQualifiedDomainName {
    fn schema_name() -> String {
        <String as schemars::JsonSchema>::schema_name()
    }

    fn json_schema(gen: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
        <String as schemars::JsonSchema>::json_schema(gen)
    }
}

impl<'de> Deserialize<'de> for PartiallyQualifiedDomainName {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        let value = String::deserialize(deserializer)?;

        Self::try_from(value).map_err(D::Error::custom)
    }
}

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

#[cfg(test)]
mod test {
    use crate::{
        error::PartiallyQualifiedDomainNameError, segment::DomainSegment, FullyQualifiedDomainName,
        PartiallyQualifiedDomainName,
    };

    #[test]
    fn construct_pqdn() {
        assert_eq!(
            PartiallyQualifiedDomainName::try_from("example.org"),
            Ok(PartiallyQualifiedDomainName::from_iter([
                DomainSegment::try_from("example").unwrap(),
                DomainSegment::try_from("org").unwrap()
            ]))
        );
    }

    #[test]
    fn pqdn_from_fqdn_fails() {
        assert_eq!(
            PartiallyQualifiedDomainName::try_from("example.org."),
            Err(PartiallyQualifiedDomainNameError::DomainIsFullyQualified)
        );
    }

    #[test]
    fn addition() {
        assert_eq!(
            &PartiallyQualifiedDomainName::try_from("test").unwrap()
                + &FullyQualifiedDomainName::try_from("example.org.").unwrap(),
            FullyQualifiedDomainName::try_from("test.example.org.").unwrap()
        )
    }

    #[test]
    fn pqdn_addition() {
        assert_eq!(
            &PartiallyQualifiedDomainName::try_from("test").unwrap()
                + &PartiallyQualifiedDomainName::try_from("example").unwrap(),
            PartiallyQualifiedDomainName::try_from("test.example").unwrap()
        )
    }
}