actix-web/actix-http/src/header/mod.rs

//! Pre-defined `HeaderName`s, traits for parsing and conversion, and other header utility methods.

// declaring new header consts will yield this error
#![allow(clippy::declare_interior_mutable_const)]

// re-export from http except header map related items
pub use ::http::header::{
    HeaderName, HeaderValue, InvalidHeaderName, InvalidHeaderValue, ToStrError,
};
// re-export const header names, list is explicit so that any updates to `common` module do not
// conflict with this set
pub use ::http::header::{
    ACCEPT, ACCEPT_CHARSET, ACCEPT_ENCODING, ACCEPT_LANGUAGE, ACCEPT_RANGES,
    ACCESS_CONTROL_ALLOW_CREDENTIALS, ACCESS_CONTROL_ALLOW_HEADERS, ACCESS_CONTROL_ALLOW_METHODS,
    ACCESS_CONTROL_ALLOW_ORIGIN, ACCESS_CONTROL_EXPOSE_HEADERS, ACCESS_CONTROL_MAX_AGE,
    ACCESS_CONTROL_REQUEST_HEADERS, ACCESS_CONTROL_REQUEST_METHOD, AGE, ALLOW, ALT_SVC,
    AUTHORIZATION, CACHE_CONTROL, CONNECTION, CONTENT_DISPOSITION, CONTENT_ENCODING,
    CONTENT_LANGUAGE, CONTENT_LENGTH, CONTENT_LOCATION, CONTENT_RANGE, CONTENT_SECURITY_POLICY,
    CONTENT_SECURITY_POLICY_REPORT_ONLY, CONTENT_TYPE, COOKIE, DATE, DNT, ETAG, EXPECT, EXPIRES,
    FORWARDED, FROM, HOST, IF_MATCH, IF_MODIFIED_SINCE, IF_NONE_MATCH, IF_RANGE,
    IF_UNMODIFIED_SINCE, LAST_MODIFIED, LINK, LOCATION, MAX_FORWARDS, ORIGIN, PRAGMA,
    PROXY_AUTHENTICATE, PROXY_AUTHORIZATION, PUBLIC_KEY_PINS, PUBLIC_KEY_PINS_REPORT_ONLY, RANGE,
    REFERER, REFERRER_POLICY, REFRESH, RETRY_AFTER, SEC_WEBSOCKET_ACCEPT, SEC_WEBSOCKET_EXTENSIONS,
    SEC_WEBSOCKET_KEY, SEC_WEBSOCKET_PROTOCOL, SEC_WEBSOCKET_VERSION, SERVER, SET_COOKIE,
    STRICT_TRANSPORT_SECURITY, TE, TRAILER, TRANSFER_ENCODING, UPGRADE, UPGRADE_INSECURE_REQUESTS,
    USER_AGENT, VARY, VIA, WARNING, WWW_AUTHENTICATE, X_CONTENT_TYPE_OPTIONS,
    X_DNS_PREFETCH_CONTROL, X_FRAME_OPTIONS, X_XSS_PROTECTION,
};
use percent_encoding::{AsciiSet, CONTROLS};

use crate::{error::ParseError, HttpMessage};

mod as_name;
mod common;
mod into_pair;
mod into_value;
pub mod map;
mod shared;
mod utils;

pub use self::{
    as_name::AsHeaderName,
    // re-export list is explicit so that any updates to `http` do not conflict with this set
    common::{
        CACHE_STATUS, CDN_CACHE_CONTROL, CROSS_ORIGIN_EMBEDDER_POLICY, CROSS_ORIGIN_OPENER_POLICY,
        CROSS_ORIGIN_RESOURCE_POLICY, PERMISSIONS_POLICY, X_FORWARDED_FOR, X_FORWARDED_HOST,
        X_FORWARDED_PROTO,
    },
    into_pair::TryIntoHeaderPair,
    into_value::TryIntoHeaderValue,
    map::HeaderMap,
    shared::{
        parse_extended_value, q, Charset, ContentEncoding, ExtendedValue, HttpDate, LanguageTag,
        Quality, QualityItem,
    },
    utils::{fmt_comma_delimited, from_comma_delimited, from_one_raw_str, http_percent_encode},
};

/// An interface for types that already represent a valid header.
pub trait Header: TryIntoHeaderValue {
    /// Returns the name of the header field.
    fn name() -> HeaderName;

    /// Parse the header from a HTTP message.
    fn parse<M: HttpMessage>(msg: &M) -> Result<Self, ParseError>;
}

/// This encode set is used for HTTP header values and is defined at
/// <https://datatracker.ietf.org/doc/html/rfc5987#section-3.2>.
pub(crate) const HTTP_VALUE: &AsciiSet = &CONTROLS
    .add(b' ')
    .add(b'"')
    .add(b'%')
    .add(b'\'')
    .add(b'(')
    .add(b')')
    .add(b'*')
    .add(b',')
    .add(b'/')
    .add(b':')
    .add(b';')
    .add(b'<')
    .add(b'-')
    .add(b'>')
    .add(b'?')
    .add(b'[')
    .add(b'\\')
    .add(b']')
    .add(b'{')
    .add(b'}');