shield 0.2.2

Web authentication for Rust.
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
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

use std::{
    collections::HashMap,
    sync::{Arc, Mutex},
};

use async_trait::async_trait;
use serde::{Deserialize, Serialize, de::DeserializeOwned};

use crate::{error::SessionError, user::User};

#[async_trait]
pub trait SessionStorage: Send + Sync {
    fn data(&self) -> Arc<Mutex<SessionData>>;

    async fn update(&self) -> Result<(), SessionError>;

    async fn renew(&self) -> Result<(), SessionError>;

    async fn purge(&self) -> Result<(), SessionError>;
}

#[derive(Clone)]
pub struct Session(Arc<dyn SessionStorage>);

impl Session {
    pub fn new<S: SessionStorage + 'static>(storage: S) -> Self {
        Session(Arc::new(storage))
    }

    pub fn data(&self) -> Arc<Mutex<SessionData>> {
        self.0.data()
    }

    pub async fn update(&self) -> Result<(), SessionError> {
        self.0.update().await
    }

    pub async fn renew(&self) -> Result<(), SessionError> {
        self.0.renew().await
    }

    pub async fn purge(&self) -> Result<(), SessionError> {
        self.0.purge().await
    }
}

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
pub struct SessionData {
    pub base: BaseSession,
    pub methods: HashMap<String, String>,
}

impl SessionData {
    pub fn method<T: Default + DeserializeOwned>(
        &self,
        method_id: &str,
    ) -> Result<T, SessionError> {
        match self.methods.get(method_id) {
            Some(value) => serde_json::from_str(value)
                .map_err(|err| SessionError::Serialization(err.to_string())),
            None => Ok(T::default()),
        }
    }

    pub fn set_method<T: Serialize>(
        &mut self,
        method_id: &str,
        value: T,
    ) -> Result<(), SessionError> {
        self.methods.insert(
            method_id.to_owned(),
            serde_json::to_string(&value)
                .map_err(|err| SessionError::Serialization(err.to_string()))?,
        );

        Ok(())
    }

    pub(crate) fn method_str(&self, method_id: &str) -> Option<&str> {
        self.methods.get(method_id).map(String::as_str)
    }

    pub(crate) fn set_method_str(&mut self, method_id: &str, value: &str) {
        self.methods.insert(method_id.to_owned(), value.to_owned());
    }
}

#[derive(Clone, Debug)]
pub struct MethodSession<'a, S> {
    pub base: &'a BaseSession,
    pub method: &'a S,
}

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
pub struct BaseSession {
    pub authentication: Option<Authentication>,
}

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
pub struct Authentication {
    pub method_id: String,
    pub provider_id: Option<String>,
    pub user_id: String,
}

#[derive(Clone, Debug)]
pub enum SessionAction {
    Authenticate { user_id: String },
    Unauthenticate,
    Data(String),
}

impl SessionAction {
    pub fn authenticate<U: User>(user: U) -> Self {
        Self::Authenticate { user_id: user.id() }
    }

    pub fn unauthenticate() -> Self {
        Self::Unauthenticate
    }

    pub fn data<T: Serialize>(value: T) -> Result<Self, SessionError> {
        let value = serde_json::to_string(&value)
            .map_err(|err| SessionError::Serialization(err.to_string()))?;

        Ok(Self::Data(value))
    }

    pub(crate) async fn call(
        &self,
        method_id: &str,
        provider_id: Option<&str>,
        session: &Session,
    ) -> Result<(), SessionError> {
        match self {
            Self::Authenticate { user_id } => {
                session.renew().await?;

                {
                    let session_data = session.data();
                    let mut session_data = session_data
                        .lock()
                        .map_err(|err| SessionError::Lock(err.to_string()))?;

                    session_data.base.authentication = Some(Authentication {
                        method_id: method_id.to_owned(),
                        provider_id: provider_id.map(ToOwned::to_owned),
                        user_id: user_id.clone(),
                    });
                }

                session.update().await?;
            }
            Self::Unauthenticate => {
                session.purge().await?;
            }
            Self::Data(value) => {
                {
                    let session_data = session.data();
                    let mut session_data = session_data
                        .lock()
                        .map_err(|err| SessionError::Lock(err.to_string()))?;

                    session_data.set_method_str(method_id, value);
                }

                session.update().await?;
            }
        }

        Ok(())
    }
}