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|
use chrono::{DateTime, Utc};
use hyper::header::HeaderValue;
use std::convert::TryFrom;
use std::fmt;
use std::ops::Deref;
/// A struct to allow homogeneous conversion into a HeaderValue. We can't
/// implement the From/Into trait on HeaderValue because we don't own
/// either of the types.
#[derive(Debug, Clone)]
pub(crate) struct IntoHeaderValue<T>(pub T);
// Generic implementations
impl<T> Deref for IntoHeaderValue<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
// Derive for each TryFrom<T> in hyper::header::HeaderValue
macro_rules! ihv_generate {
($t:ident) => {
impl TryFrom<HeaderValue> for IntoHeaderValue<$t> {
type Error = String;
fn try_from(hdr_value: HeaderValue) -> Result<Self, Self::Error> {
match hdr_value.to_str() {
Ok(hdr_value) => match hdr_value.parse::<$t>() {
Ok(hdr_value) => Ok(IntoHeaderValue(hdr_value)),
Err(e) => Err(format!(
"Unable to parse {} as a string: {}",
stringify!($t),
e
)),
},
Err(e) => Err(format!(
"Unable to parse header {:?} as a string - {}",
hdr_value, e
)),
}
}
}
impl TryFrom<IntoHeaderValue<$t>> for HeaderValue {
type Error = String;
fn try_from(hdr_value: IntoHeaderValue<$t>) -> Result<Self, Self::Error> {
Ok(hdr_value.0.into())
}
}
};
}
ihv_generate!(u64);
ihv_generate!(i64);
ihv_generate!(i16);
ihv_generate!(u16);
ihv_generate!(u32);
ihv_generate!(usize);
ihv_generate!(isize);
ihv_generate!(i32);
// Custom derivations
// Vec<String>
impl TryFrom<HeaderValue> for IntoHeaderValue<Vec<String>> {
type Error = String;
fn try_from(hdr_value: HeaderValue) -> Result<Self, Self::Error> {
match hdr_value.to_str() {
Ok(hdr_value) => Ok(IntoHeaderValue(
hdr_value
.split(',')
.filter_map(|x| match x.trim() {
"" => None,
y => Some(y.to_string()),
})
.collect(),
)),
Err(e) => Err(format!(
"Unable to parse header: {:?} as a string - {}",
hdr_value, e
)),
}
}
}
impl TryFrom<IntoHeaderValue<Vec<String>>> for HeaderValue {
type Error = String;
fn try_from(hdr_value: IntoHeaderValue<Vec<String>>) -> Result<Self, Self::Error> {
match HeaderValue::from_str(&hdr_value.0.join(", ")) {
Ok(hdr_value) => Ok(hdr_value),
Err(e) => Err(format!(
"Unable to convert {:?} into a header - {}",
hdr_value, e
)),
}
}
}
// String
impl TryFrom<HeaderValue> for IntoHeaderValue<String> {
type Error = String;
fn try_from(hdr_value: HeaderValue) -> Result<Self, Self::Error> {
match hdr_value.to_str() {
Ok(hdr_value) => Ok(IntoHeaderValue(hdr_value.to_string())),
Err(e) => Err(format!("Unable to convert header {:?} to {}", hdr_value, e)),
}
}
}
impl TryFrom<IntoHeaderValue<String>> for HeaderValue {
type Error = String;
fn try_from(hdr_value: IntoHeaderValue<String>) -> Result<Self, Self::Error> {
match HeaderValue::from_str(&hdr_value.0) {
Ok(hdr_value) => Ok(hdr_value),
Err(e) => Err(format!(
"Unable to convert {:?} from a header {}",
hdr_value, e
)),
}
}
}
// bool
impl TryFrom<HeaderValue> for IntoHeaderValue<bool> {
type Error = String;
fn try_from(hdr_value: HeaderValue) -> Result<Self, Self::Error> {
match hdr_value.to_str() {
Ok(hdr_value) => match hdr_value.parse() {
Ok(hdr_value) => Ok(IntoHeaderValue(hdr_value)),
Err(e) => Err(format!("Unable to parse bool from {} - {}", hdr_value, e)),
},
Err(e) => Err(format!(
"Unable to convert {:?} from a header {}",
hdr_value, e
)),
}
}
}
impl TryFrom<IntoHeaderValue<bool>> for HeaderValue {
type Error = String;
fn try_from(hdr_value: IntoHeaderValue<bool>) -> Result<Self, Self::Error> {
match HeaderValue::from_str(&hdr_value.0.to_string()) {
Ok(hdr_value) => Ok(hdr_value),
Err(e) => Err(format!(
"Unable to convert: {:?} into a header: {}",
hdr_value, e
)),
}
}
}
// DateTime
impl TryFrom<HeaderValue> for IntoHeaderValue<DateTime<Utc>> {
type Error = String;
fn try_from(hdr_value: HeaderValue) -> Result<Self, Self::Error> {
match hdr_value.to_str() {
Ok(hdr_value) => match DateTime::parse_from_rfc3339(hdr_value) {
Ok(date) => Ok(IntoHeaderValue(date.with_timezone(&Utc))),
Err(e) => Err(format!("Unable to parse: {} as date - {}", hdr_value, e)),
},
Err(e) => Err(format!(
"Unable to convert header {:?} to string {}",
hdr_value, e
)),
}
}
}
impl TryFrom<IntoHeaderValue<DateTime<Utc>>> for HeaderValue {
type Error = String;
fn try_from(hdr_value: IntoHeaderValue<DateTime<Utc>>) -> Result<Self, Self::Error> {
match HeaderValue::from_str(hdr_value.0.to_rfc3339().as_str()) {
Ok(hdr_value) => Ok(hdr_value),
Err(e) => Err(format!(
"Unable to convert {:?} to a header: {}",
hdr_value, e
)),
}
}
}
|
