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use http::header::HeaderMap;
use std::net::IpAddr;
/// Extension trait for [`HeaderMap`](http::HeaderMap).
pub trait HeaderMapExt {
/// Ges the string corresponding to the key.
fn get_str(&self, key: &str) -> Option<&str>;
/// Gets the destination host.
///
/// It is determined in the following priority:
///
/// 1. `Forwarded` header `host` key
/// 2. The first `X-Forwarded-Host` header
/// 3. `Host` header
fn get_host(&self) -> Option<&str> {
self.get_str("forwarded")
.and_then(|s| {
s.split(';').find_map(|entry| {
let parts = entry.split('=').collect::<Vec<_>>();
(parts.len() == 2 && parts[0].eq_ignore_ascii_case("host")).then(|| parts[1])
})
})
.or_else(|| {
self.get_str("x-forwarded-host")
.and_then(|s| s.split(',').next())
})
.or_else(|| self.get_str("host"))
}
/// Gets the client's remote IP.
///
/// It is determined in the following priority:
///
/// 1. `Forwarded` header `for` key
/// 2. The first `X-Forwarded-For` header
/// 3. The first `X-Real-Ip` header
fn get_client_ip(&self) -> Option<IpAddr> {
self.get_str("forwarded")
.and_then(|s| {
s.split(';').find_map(|entry| {
let parts = entry.split('=').collect::<Vec<_>>();
(parts.len() == 2 && parts[0].eq_ignore_ascii_case("for")).then(|| parts[1])
})
})
.or_else(|| {
self.get_str("x-forwarded-for")
.and_then(|s| s.split(',').next())
})
.or_else(|| self.get_str("x-real-ip"))
.and_then(|s| s.parse().ok())
}
/// Gets the essence of the `content-type` header, discarding the optional parameters.
fn get_content_type(&self) -> Option<&str> {
self.get_str("content-type").map(|content_type| {
if let Some((essence, _)) = content_type.split_once(';') {
essence
} else {
content_type
}
})
}
/// Checks whether it has a `content-type: application/json` or similar header.
fn has_json_content_type(&self) -> bool {
if let Some(content_type) = self.get_str("content-type") {
crate::helper::check_json_content_type(content_type)
} else {
false
}
}
}
impl HeaderMapExt for HeaderMap {
#[inline]
fn get_str(&self, key: &str) -> Option<&str> {
self.get(key).and_then(|v| v.to_str().ok())
}
}