zone-edit 0.4.2

A minimal library of DNS provider utilities
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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215

use std::str::FromStr;

use serde::{de::DeserializeOwned, Deserialize, Deserializer};
use tracing::{error, warn};
use ureq::{
    http::{
        header::{ACCEPT, AUTHORIZATION, CONTENT_TYPE},
        HeaderName, HeaderValue, Response, StatusCode
    },
    tls::TlsConfig,
    Agent, Body, RequestBuilder, ResponseExt
};

use crate::errors::{Error, Result};


/// Extension trait for converting ureq HTTP responses to optional
/// values or error information.
///
/// This trait provides methods for handling HTTP responses in a way that:
/// - Converts successful responses (status 200 OK) into deserialized values
/// - Treats not found responses (status 404) as `None` values
/// - Converts other error statuses into appropriate error types
pub(crate) trait ResponseToOption: Sized {
    /// Converts the HTTP response body to an optional value based on the status code.
    ///
    /// This method handles different HTTP status codes as follows:
    /// - `200 OK`: Deserializes the response body into the requested type `T`
    /// - `404 NOT_FOUND`: Returns `None` without erroring (useful for optional lookups)
    /// - All other status codes: Returns an `ApiError` with the status and response body
    ///
    /// # Type Parameters
    ///
    /// * `T` - The type to deserialize the response body into. Must implement `DeserializeOwned`.
    ///
    /// # Returns
    ///
    /// Returns a `Result` containing:
    /// - `Ok(Some(T))` if the response status is 200 OK and deserialization succeeds
    /// - `Ok(None)` if the response status is 404 NOT_FOUND
    /// - `Err(Error)` if the response status is not 200 or 404, or if deserialization fails
    fn to_option<T>(&mut self) -> Result<Option<T>>
    where
        T: DeserializeOwned;

    /// Checks for HTTP errors in the response.
    ///
    /// This method provides custom error handling for `ureq` responses. Since the
    /// default `http_status_as_error` feature is disabled to allow for more
    /// granular control (like treating 404 as `None`), this function is used to
    /// explicitly check for other error-level status codes.
    ///
    /// If the response status is successful (2xx), it returns the response as-is.
    /// Otherwise, it reads the response body, logs the error, and returns an
    /// `Error::HttpError` with the status code and body content.
    ///
    /// # Returns
    ///
    /// - `Ok(Self)` if the response was successful.
    /// - `Err(Error::HttpError)` if the response status indicates an error.
    fn check_error(self) -> Result<Self>;
}



impl ResponseToOption for Response<Body> {
    fn to_option<T>(&mut self) -> Result<Option<T>>
    where
        T: DeserializeOwned
    {
        match self.status() {
            StatusCode::OK => {
                let body = self.body_mut().read_to_string()?;
                let obj: T = serde_json::from_str(&body)?;
                Ok(Some(obj))
            }
            StatusCode::NOT_FOUND => {
                warn!("Record doesn't exist: {}", self.get_uri());
                Ok(None)
            }
            _ => {
                let body = self.body_mut().read_to_string()?;
                Err(Error::ApiError(format!("Api Error: {} -> {body}", self.status())))
            }
        }
    }

    fn check_error(mut self) -> Result<Self> {
        // This roughly duplicates the effect of ureq's
        // `http_status_as_error` flag, which we disable to simplify
        // finer-grained status handling above.
        let code = self.status();
        if code.is_success() {
            return Ok(self)
        }

        let err = self.body_mut()
            .read_to_string()?;
        error!("REST op failed: {code} {err:?}");

        Err(Error::HttpError(format!("REST op failed: {code} {err:?}")))
    }

}


/// Extension trait for adding headers and authentication to a `ureq` request builder.
///
/// This trait provides convenient methods for adding multiple headers, authentication tokens,
/// and common JSON headers to a `RequestBuilder`.
pub(crate) trait WithHeaders<T> {
    /// Adds a collection of headers to the request builder.
    ///
    /// This method takes a vector of key-value pairs and adds them as headers to the request.
    /// It validates both the header names and values, returning an error if either is invalid.
    ///
    /// # Arguments
    ///
    /// * `headers` - A vector of `(&str, String)` tuples representing header key-value pairs.
    ///
    /// # Returns
    ///
    /// Returns a `Result` containing the modified `RequestBuilder` on success, or an `Error`
    /// if header validation fails.
    fn with_headers(self, headers: Vec<(&str, String)>) -> Result<RequestBuilder<T>>;

    /// Adds an `AUTHORIZATION` header to the request builder.
    ///
    /// This is a convenience method for setting the `AUTHORIZATION` header, commonly used for
    /// bearer tokens or other authentication schemes.
    ///
    /// # Arguments
    ///
    /// * `auth` - The authentication token or value as a `String`.
    ///
    /// # Returns
    ///
    /// Returns the modified `RequestBuilder`.
    fn with_auth(self, auth: String) -> RequestBuilder<T>;

    /// Adds `ACCEPT` and `CONTENT_TYPE` headers for JSON content.
    ///
    /// This method sets the `ACCEPT` and `CONTENT_TYPE` headers to `application/json`,
    /// which is a common requirement for REST APIs.
    ///
    /// # Returns
    ///
    /// Returns the modified `RequestBuilder`.
    fn with_json_headers(self) -> RequestBuilder<T>;
}

/// Implementation of the `WithHeaders` trait for `RequestBuilder`.
impl<Any> WithHeaders<Any> for RequestBuilder<Any> {

    fn with_headers(mut self, headers: Vec<(&str, String)>) -> Result<Self> {
        let reqh = self.headers_mut()
            .ok_or(Error::HttpError("Failed to get headers from ureq".to_string()))?;

        for (k, v) in headers {
            reqh.insert(HeaderName::from_str(k)?, HeaderValue::from_str(&v)?);
        }

        Ok(self)
    }

    fn with_auth(self, auth: String) -> Self {
        self.header(AUTHORIZATION, auth)
    }

    fn with_json_headers(self) -> Self {
        self.header(ACCEPT, "application/json")
            .header(CONTENT_TYPE, "application/json")
    }
}

/// Create and return a configured HTTP ureq agent.
///
/// This function sets up a ureq Agent with specific configuration options
/// that are suitable for DNS provider APIs, including support for legacy
/// TLS protocol versions that some providers may still use.
///
/// The client is configured with:
/// - HTTP status codes not treated as errors (http_status_as_error(false))
/// - Native TLS provider to support legacy TLS versions that Rustls doesn't support
///
/// # Returns
///
/// Returns a configured `Agent` instance that can be used to make HTTP requests.
pub(crate) fn client() -> Agent {
    Agent::config_builder()
        .http_status_as_error(false)
        .tls_config(
            // At least one provider (DnsMadeEasy) uses legacy TLS
            // protocol versions that Rustls doesn't support on their
            // sandbox.
            TlsConfig::builder()
                .provider(ureq::tls::TlsProvider::NativeTls)
                .build()
        )
        .build()
        .new_agent()
}



pub(crate) fn de_str<'de, T, D>(destr: D) -> std::result::Result<T, D::Error>
where
    T: FromStr,
    T::Err: std::fmt::Display,
    D: Deserializer<'de>,
{
    let s = String::deserialize(destr)?;
    T::from_str(&s)
        .map_err(serde::de::Error::custom)
}