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use crate::{error::Error, Result};
use std::{
iter::{FromIterator, Map},
result::Result as StdResult,
str::FromStr,
};
use http::{header::HeaderName, HeaderMap, HeaderValue};
use js_sys::Array;
use wasm_bindgen::JsValue;
use worker_sys::ext::HeadersExt;
/// A [Headers](https://developer.mozilla.org/en-US/docs/Web/API/Headers) representation used in
/// Request and Response objects.
pub struct Headers(pub web_sys::Headers);
impl std::fmt::Debug for Headers {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_str("Headers {\n")?;
for (k, v) in self.entries() {
f.write_str(&format!("{k} = {v}\n"))?;
}
f.write_str("}\n")
}
}
impl Headers {
/// Construct a new `Headers` struct.
pub fn new() -> Self {
Default::default()
}
/// Returns all the values of a header within a `Headers` object with a given name.
/// Returns an error if the name is invalid (e.g. contains spaces)
pub fn get(&self, name: &str) -> Result<Option<String>> {
self.0.get(name).map_err(Error::from)
}
/// Returns a boolean stating whether a `Headers` object contains a certain header.
/// Returns an error if the name is invalid (e.g. contains spaces)
pub fn has(&self, name: &str) -> Result<bool> {
self.0.has(name).map_err(Error::from)
}
/// Returns an error if the name is invalid (e.g. contains spaces)
pub fn append(&mut self, name: &str, value: &str) -> Result<()> {
self.0.append(name, value).map_err(Error::from)
}
/// Sets a new value for an existing header inside a `Headers` object, or adds the header if it does not already exist.
/// Returns an error if the name is invalid (e.g. contains spaces)
pub fn set(&mut self, name: &str, value: &str) -> Result<()> {
self.0.set(name, value).map_err(Error::from)
}
/// Deletes a header from a `Headers` object.
/// Returns an error if the name is invalid (e.g. contains spaces)
/// or if the JS Headers object's guard is immutable (e.g. for an incoming request)
pub fn delete(&mut self, name: &str) -> Result<()> {
self.0.delete(name).map_err(Error::from)
}
/// Returns an iterator allowing to go through all key/value pairs contained in this object.
pub fn entries(&self) -> HeaderIterator {
self.0
.entries()
.into_iter()
// The entries iterator.next() will always return a proper value: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
.map((|a| a.unwrap().into()) as F1)
// The entries iterator always returns an array[2] of strings
.map(|a: Array| (a.get(0).as_string().unwrap(), a.get(1).as_string().unwrap()))
}
/// Returns an iterator allowing you to go through all keys of the key/value pairs contained in
/// this object.
pub fn keys(&self) -> impl Iterator<Item = String> {
self.0
.keys()
.into_iter()
// The keys iterator.next() will always return a proper value containing a string
.map(|a| a.unwrap().as_string().unwrap())
}
/// Returns an iterator allowing you to go through all values of the key/value pairs contained
/// in this object.
pub fn values(&self) -> impl Iterator<Item = String> {
self.0
.values()
.into_iter()
// The values iterator.next() will always return a proper value containing a string
.map(|a| a.unwrap().as_string().unwrap())
}
/// Returns all the values of a header within a `Headers` object with a given name.
pub fn get_all(&self, name: &str) -> Result<Vec<String>> {
let array = self.0.get_all(name);
array
.iter()
.map(|v| {
v.as_string()
.ok_or_else(|| Error::JsError("Invalid header value".into()))
})
.collect()
}
}
impl Default for Headers {
fn default() -> Self {
// This cannot throw an error: https://developer.mozilla.org/en-US/docs/Web/API/Headers/Headers
Headers(web_sys::Headers::new().unwrap())
}
}
type F1 = fn(StdResult<JsValue, JsValue>) -> Array;
type HeaderIterator = Map<Map<js_sys::IntoIter, F1>, fn(Array) -> (String, String)>;
impl IntoIterator for &Headers {
type Item = (String, String);
type IntoIter = HeaderIterator;
fn into_iter(self) -> Self::IntoIter {
self.entries()
}
}
impl<T: AsRef<str>> FromIterator<(T, T)> for Headers {
fn from_iter<U: IntoIterator<Item = (T, T)>>(iter: U) -> Self {
let mut headers = Headers::new();
iter.into_iter().for_each(|(name, value)| {
headers.append(name.as_ref(), value.as_ref()).ok();
});
headers
}
}
impl<'a, T: AsRef<str>> FromIterator<&'a (T, T)> for Headers {
fn from_iter<U: IntoIterator<Item = &'a (T, T)>>(iter: U) -> Self {
let mut headers = Headers::new();
iter.into_iter().for_each(|(name, value)| {
headers.append(name.as_ref(), value.as_ref()).ok();
});
headers
}
}
impl AsRef<JsValue> for Headers {
fn as_ref(&self) -> &JsValue {
&self.0
}
}
impl From<&HeaderMap> for Headers {
fn from(map: &HeaderMap) -> Self {
map.keys()
.flat_map(|name| {
map.get_all(name)
.into_iter()
.map(move |value| (name.to_string(), value.to_str().unwrap().to_owned()))
})
.collect()
}
}
impl From<HeaderMap> for Headers {
fn from(map: HeaderMap) -> Self {
(&map).into()
}
}
impl From<&Headers> for HeaderMap {
fn from(headers: &Headers) -> Self {
headers
.into_iter()
.map(|(name, value)| {
(
HeaderName::from_str(&name).unwrap(),
HeaderValue::from_str(&value).unwrap(),
)
})
.collect()
}
}
impl From<Headers> for HeaderMap {
fn from(headers: Headers) -> Self {
(&headers).into()
}
}
impl Clone for Headers {
fn clone(&self) -> Self {
// Headers constructor doesn't throw an error
Headers(web_sys::Headers::new_with_headers(&self.0).unwrap())
}
}