xsmtp 0.1.19

smtp send mail
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

#![feature(const_trait_impl)]
use std::net::IpAddr;

use aok::OK;
use mail_builder::{MessageBuilder, headers::address::Address};
use mail_send::SmtpClientBuilder;
use rand::{Rng, SeedableRng, rngs::StdRng};
use thiserror::Error;
use tokio::sync::RwLock;

#[derive(Error, Debug)]
pub enum XsmtpError {
  #[error("{0} DNS NO IP")]
  DnsNoIp(String),
}

// SMTP HOST 请给域名而不是 IP

genv::s!(SMTP_IMPLICIT_TLS:bool| false);
genv::s!(SMTP_PORT:u16| 587);
genv::s!(SMTP_HOST, SMTP_FROM, SMTP_USER, SMTP_PASSWORD);

pub fn smtp_builder(host: impl Into<String>, ip: IpAddr) -> SmtpClientBuilder<String> {
  let smtp_user = SMTP_USER.as_str();
  let smtp_password = SMTP_PASSWORD.as_str();
  let smtp_port: u16 = *SMTP_PORT;

  SmtpClientBuilder::new_bind_ip(host.into(), ip, smtp_port)
    .implicit_tls(*SMTP_IMPLICIT_TLS)
    .credentials((smtp_user.into(), smtp_password.into()))
}

#[static_init::dynamic]
pub static SMTP: RwLock<Option<SmtpClientBuilder<String>>> = RwLock::new(None);

pub async fn send_with_ipli(
  from_name: impl AsRef<str>,
  to: impl Into<Address<'static>>,
  subject: impl AsRef<str>,
  txt: impl AsRef<str>,
  htm: impl AsRef<str>,
  ip_li: Vec<IpAddr>,
) -> aok::Result<()> {
  let from_name = from_name.as_ref();
  let to = to.into();
  let subject = subject.as_ref();
  let txt = txt.as_ref();
  let htm = htm.as_ref();

  {
    if let Some(smtp) = &*SMTP.read().await {
      if let Err(err) = no_retry_send(smtp, from_name, to.clone(), subject, txt, htm).await {
        tracing::error!("SMTP {err}");
      } else {
        return OK;
      }
    }
  }

  let host = SMTP_HOST.as_str();
  let len = ip_li.len();
  if len == 0 {
    Err(XsmtpError::DnsNoIp(host.into()))?
  }

  let mut rng = StdRng::from_rng(&mut rand::rng());
  let mut pos = rng.random_range(0..len);

  let mut remain = len;
  loop {
    remain -= 1;
    let ip = ip_li[pos % ip_li.len()];
    pos += 1;
    let smtp = smtp_builder(host, ip);
    if let Err(err) = no_retry_send(&smtp, from_name, to.clone(), subject, txt, htm).await {
      if remain == 0 {
        *SMTP.write().await = None;
        return Err(err)?;
      }
      tracing::error!("{host} SMTP {err}");
    } else {
      *SMTP.write().await = Some(smtp);
      return OK;
    }
  }
}

pub async fn send(
  from_name: impl AsRef<str>,
  to: impl Into<Address<'static>>,
  subject: impl AsRef<str>,
  txt: impl AsRef<str>,
  htm: impl AsRef<str>,
) -> aok::Result<()> {
  let ip_li = idns::ip(&*SMTP_HOST).await?;
  send_with_ipli(from_name, to, subject, txt, htm, ip_li).await
}

pub async fn no_retry_send(
  smtp: &SmtpClientBuilder<String>,
  from_name: impl AsRef<str>,
  to: impl Into<Address<'static>>,
  subject: impl AsRef<str>,
  txt: impl AsRef<str>,
  htm: impl AsRef<str>,
) -> Result<(), mail_send::Error> {
  let from_name = from_name.as_ref();
  let subject = subject.as_ref();
  let txt = txt.as_ref();
  let htm = htm.as_ref();
  let to = to.into();

  let mut mail = MessageBuilder::new()
    .from((from_name, SMTP_FROM.as_str()))
    .to(to)
    .subject(subject);
  if !txt.is_empty() {
    mail = mail.text_body(txt);
  }
  if !htm.is_empty() {
    mail = mail.html_body(htm);
  }
  smtp.connect().await?.send(mail).await?;
  Ok(())
}

pub fn send_bg(
  from_name: impl Into<String>,
  to: impl Into<Address<'static>>,
  subject: impl Into<String>,
  txt: impl Into<String>,
  htm: impl Into<String>,
) {
  let subject = subject.into();
  let txt = txt.into();
  let htm = htm.into();
  let from_name = from_name.into();
  let to = to.into();
  trt::bg(send(from_name, to, subject, txt, htm));
}