missive 0.6.2

Compose, deliver, preview, and test emails in Rust - pluggable providers with zero configuration code
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

//! Unsent API provider.
//!
//! # Example
//!
//! ```rust,ignore
//! use missive::providers::UnsentMailer;
//!
//! let mailer = UnsentMailer::new("unsent_xxxxx");
//! ```

use async_trait::async_trait;
use reqwest::Client;
use serde::{Deserialize, Serialize};

use crate::email::Email;
use crate::error::MailError;
use crate::mailer::{DeliveryResult, Mailer};

const UNSENT_API_URL: &str = "https://api.unsend.dev/v1";

/// Unsent API email provider.
pub struct UnsentMailer {
    api_key: String,
    client: Client,
    base_url: String,
}

impl UnsentMailer {
    /// Create a new Unsent mailer with the given API key.
    pub fn new(api_key: impl Into<String>) -> Self {
        Self {
            api_key: api_key.into(),
            client: Client::new(),
            base_url: UNSENT_API_URL.to_string(),
        }
    }

    /// Create with a custom reqwest client.
    pub fn with_client(api_key: impl Into<String>, client: Client) -> Self {
        Self {
            api_key: api_key.into(),
            client,
            base_url: UNSENT_API_URL.to_string(),
        }
    }

    /// Set a custom base URL (for testing).
    pub fn base_url(mut self, url: impl Into<String>) -> Self {
        self.base_url = url.into();
        self
    }

    fn build_request(&self, email: &Email) -> Result<UnsentRequest, MailError> {
        let from = email.from.as_ref().ok_or(MailError::MissingField("from"))?;

        if email.to.is_empty() {
            return Err(MailError::MissingField("to"));
        }

        Ok(UnsentRequest {
            from: from.formatted(),
            to: email.to.iter().map(|a| a.formatted()).collect(),
            subject: email.subject.clone(),
            html: email.html_body.clone(),
            text: email.text_body.clone(),
            cc: if email.cc.is_empty() {
                None
            } else {
                Some(email.cc.iter().map(|a| a.formatted()).collect())
            },
            bcc: if email.bcc.is_empty() {
                None
            } else {
                Some(email.bcc.iter().map(|a| a.formatted()).collect())
            },
            reply_to: email.reply_to.first().map(|a| a.formatted()),
        })
    }
}

#[async_trait]
impl Mailer for UnsentMailer {
    async fn deliver(&self, email: &Email) -> Result<DeliveryResult, MailError> {
        let request = self.build_request(email)?;

        let url = format!("{}/emails", self.base_url);
        let response = self
            .client
            .post(&url)
            .header("Authorization", format!("Bearer {}", self.api_key))
            .header("Content-Type", "application/json")
            .header("User-Agent", format!("missive/{}", crate::VERSION))
            .json(&request)
            .send()
            .await?;

        let status = response.status();

        if status.is_success() {
            let result: UnsentResponse = response.json().await?;
            Ok(DeliveryResult::with_response(
                result.email_id,
                serde_json::json!({ "provider": "unsent" }),
            ))
        } else {
            let error_text = response.text().await.unwrap_or_default();
            Err(MailError::provider_with_status(
                "unsent",
                error_text,
                status.as_u16(),
            ))
        }
    }

    fn provider_name(&self) -> &'static str {
        "unsent"
    }
}

// ============================================================================
// Unsent API Types
// ============================================================================

#[derive(Debug, Serialize)]
struct UnsentRequest {
    from: String,
    to: Vec<String>,
    subject: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    html: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    text: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    cc: Option<Vec<String>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    bcc: Option<Vec<String>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    reply_to: Option<String>,
}

#[derive(Debug, Deserialize)]
struct UnsentResponse {
    #[serde(rename = "emailId")]
    email_id: String,
}