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| 1 | +//! Reexport of the `mime` crate and some mime related utilities. |
| 2 | +
|
| 3 | +pub use mime::*; |
| 4 | + |
| 5 | +use crate::http::Request; |
| 6 | + |
| 7 | +#[doc(hidden)] |
| 8 | +#[inline] |
| 9 | +pub fn guess_accept_mime(req: &Request, default_type: Option<Mime>) -> Mime { |
| 10 | + let dmime: Mime = default_type.unwrap_or(mime::TEXT_HTML); |
| 11 | + let accept = req.accept(); |
| 12 | + accept |
| 13 | + .first() |
| 14 | + .unwrap_or(&dmime) |
| 15 | + .to_string() |
| 16 | + .parse() |
| 17 | + .unwrap_or(dmime) |
| 18 | +} |
| 19 | + |
| 20 | +#[doc(hidden)] |
| 21 | +#[inline] |
| 22 | +#[must_use] |
| 23 | +pub fn detect_text_mime(buffer: &[u8]) -> Option<Mime> { |
| 24 | + let info = content_inspector::inspect(buffer); |
| 25 | + if info.is_text() { |
| 26 | + if let Some(charset) = detect_text_charset(buffer) { |
| 27 | + if charset.eq_ignore_ascii_case("utf-8") { |
| 28 | + Some(mime::TEXT_PLAIN_UTF_8) |
| 29 | + } else { |
| 30 | + format!("text/plain; charset={charset}") |
| 31 | + .parse::<Mime>() |
| 32 | + .ok() |
| 33 | + } |
| 34 | + } else { |
| 35 | + Some(mime::TEXT_PLAIN_UTF_8) |
| 36 | + } |
| 37 | + } else { |
| 38 | + None |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +#[doc(hidden)] |
| 43 | +#[inline] |
| 44 | +#[must_use] |
| 45 | +pub fn detect_text_charset(buffer: &[u8]) -> Option<String> { |
| 46 | + let mut detector = chardetng::EncodingDetector::new(); |
| 47 | + detector.feed(buffer, buffer.len() < 1024); |
| 48 | + |
| 49 | + let (encoding, _) = detector.guess_assess(None, true); |
| 50 | + if encoding.name().eq_ignore_ascii_case("utf-8") { |
| 51 | + Some("utf-8".into()) |
| 52 | + } else { |
| 53 | + Some(encoding.name().into()) |
| 54 | + } |
| 55 | +} |
| 56 | + |
| 57 | +#[doc(hidden)] |
| 58 | +#[inline] |
| 59 | +#[must_use] |
| 60 | +pub fn is_charset_required_mime(mime: &Mime) -> bool { |
| 61 | + matches!(mime.subtype(), mime::JAVASCRIPT | mime::XML | mime::JSON) |
| 62 | + || matches!(mime.type_(), mime::TEXT) |
| 63 | +} |
| 64 | + |
| 65 | +#[doc(hidden)] |
| 66 | +#[inline] |
| 67 | +pub fn fill_mime_charset_if_need(mime: &mut Mime, buffer: &[u8]) { |
| 68 | + if !is_charset_required_mime(mime) || mime.get_param("charset").is_some() { |
| 69 | + return; |
| 70 | + } |
| 71 | + if let Some(charset) = detect_text_charset(buffer) { |
| 72 | + if let Ok(new_mime) = format!("{mime}; charset={charset}").parse::<Mime>() { |
| 73 | + *mime = new_mime; |
| 74 | + } |
| 75 | + } |
| 76 | +} |
| 77 | + |
| 78 | +#[cfg(test)] |
| 79 | +mod tests { |
| 80 | + use super::*; |
| 81 | + use crate::http::header::*; |
| 82 | + |
| 83 | + #[test] |
| 84 | + fn test_guess_accept_mime() { |
| 85 | + let mut req = Request::default(); |
| 86 | + let headers = req.headers_mut(); |
| 87 | + headers.insert(ACCEPT, HeaderValue::from_static("application/javascript")); |
| 88 | + let mime = guess_accept_mime(&req, None); |
| 89 | + assert_eq!(mime, "application/javascript".parse::<Mime>().unwrap()); |
| 90 | + } |
| 91 | +} |
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