cryptr 0.10.0

simple encrypted (streaming) values
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

use cryptr::CryptrError;
use std::fmt::Write;
use tokio::io::{stdin, AsyncBufReadExt, BufReader};

/// Reads a line from stdin
pub(crate) async fn read_line_stdin() -> Result<String, CryptrError> {
    let (tx, rx) = flume::unbounded::<Option<String>>();

    tokio::spawn(async move {
        let stdin = BufReader::new(stdin());

        let res = match stdin.lines().next_line().await {
            Ok(Some(line)) => Some(line),
            Ok(None) => None,
            Err(_) => None,
        };
        tx.send_async(res).await.unwrap();
    });

    let mut res = String::with_capacity(32);
    while let Ok(data) = rx.recv_async().await {
        match data {
            None => {
                return Err(CryptrError::Cli(
                    "Error reading line from stdin".to_string(),
                ))
            }
            Some(data) => write!(res, "{data}")?,
        }
    }

    Ok(res)
}

#[derive(Debug)]
pub struct PromptPassword {
    pub not_empty: bool,
    pub min_len: Option<usize>,
    pub max_len: Option<usize>,
    pub contains_lowercase: Option<usize>,
    pub contains_uppercase: Option<usize>,
    pub contains_digit: Option<usize>,
}

impl Default for PromptPassword {
    fn default() -> Self {
        Self {
            not_empty: true,
            min_len: Some(14),
            max_len: Some(128),
            contains_lowercase: Some(1),
            contains_uppercase: Some(1),
            contains_digit: Some(1),
        }
    }
}

impl PromptPassword {
    pub async fn prompt(&self, message: String) -> Result<String, CryptrError> {
        let password =
            tokio::task::spawn_blocking(move || rpassword::prompt_password(message)).await??;
        Ok(password)
    }

    pub async fn prompt_validated(&self, message: &str) -> Result<String, CryptrError> {
        let mut password;
        loop {
            let msg = message.to_string();
            password =
                tokio::task::spawn_blocking(move || rpassword::prompt_password(msg)).await??;

            match self.validate(&password) {
                Ok(_) => {
                    return Ok(password);
                }
                Err(policy) => {
                    eprintln!("{policy}");
                }
            }
        }
    }

    fn policy_str(&self) -> Result<String, CryptrError> {
        let mut policy = "Password policy:\n".to_string();

        if self.not_empty {
            writeln!(policy, " - must not be empty")?;
        }

        if let Some(min) = self.min_len {
            writeln!(policy, " - min length: {min}")?;
        }

        if let Some(max) = self.max_len {
            writeln!(policy, " - max length: {max}")?;
        }

        if let Some(lower) = self.contains_lowercase {
            writeln!(policy, " - min lowercase characters: {lower}")?;
        }

        if let Some(upper) = self.contains_uppercase {
            writeln!(policy, " - min uppercase characters: {upper}")?;
        }

        if let Some(digit) = self.contains_digit {
            writeln!(policy, " - min digits: {digit}")?;
        }

        Ok(policy)
    }

    fn validate(&self, password: &str) -> Result<(), CryptrError> {
        if self.not_empty && password.is_empty() {
            return Err(CryptrError::Cli(self.policy_str()?));
        }

        if let Some(min) = self.min_len {
            if password.len() < min {
                return Err(CryptrError::Cli(self.policy_str()?));
            }
        }
        if let Some(max) = self.max_len {
            if password.len() > max {
                return Err(CryptrError::Cli(self.policy_str()?));
            }
        }

        let mut contains_lower = 0;
        let mut contains_upper = 0;
        let mut contains_digit = 0;
        for char in password.chars() {
            if char.is_ascii_lowercase() {
                contains_lower += 1;
            } else if char.is_ascii_uppercase() {
                contains_upper += 1;
            } else if char.is_ascii_digit() {
                contains_digit += 1;
            }
        }

        if let Some(lower) = self.contains_lowercase {
            if contains_lower < lower {
                return Err(CryptrError::Cli(self.policy_str()?));
            }
        }
        if let Some(upper) = self.contains_uppercase {
            if contains_upper < upper {
                return Err(CryptrError::Cli(self.policy_str()?));
            }
        }
        if let Some(digit) = self.contains_digit {
            if contains_digit < digit {
                return Err(CryptrError::Cli(self.policy_str()?));
            }
        }

        Ok(())
    }
}