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media: check detected content-type against MSC2702

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only return `inline` if the detected content-type is an allowed
inline content-type as defined by MSC2702

Signed-off-by: strawberry <strawberry@puppygock.gay>
This commit is contained in:
strawberry 2024-05-30 23:03:59 -04:00
parent 9b096cc67b
commit f11103b43b
1 changed files with 36 additions and 19 deletions
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55
src/core/utils/content_disposition.rs
View file

@ -1,5 +1,3 @@
use infer::MatcherType;
use crate::debug_info;
const ATTACHMENT: &str = "attachment";
@ -7,34 +5,53 @@ const INLINE: &str = "inline";
const APPLICATION_OCTET_STREAM: &str = "application/octet-stream";
const IMAGE_SVG_XML: &str = "image/svg+xml";
/// as defined by MSC2702
const ALLOWED_INLINE_CONTENT_TYPES: [&str; 26] = [
"text/css",
"text/plain",
"text/csv",
"application/json",
"application/ld+json",
"image/jpeg",
"image/gif",
"image/png",
"image/apng",
"image/webp",
"image/avif",
"video/mp4",
"video/webm",
"video/ogg",
"video/quicktime",
"audio/mp4",
"audio/webm",
"audio/aac",
"audio/mpeg",
"audio/ogg",
"audio/wave",
"audio/wav",
"audio/x-wav",
"audio/x-pn-wav",
"audio/flac",
"audio/x-flac",
];
/// Returns a Content-Disposition of `attachment` or `inline`, depending on the
/// *parsed* contents of the file uploaded via format magic keys using `infer`
/// crate (basically libmagic without needing libmagic).
///
/// This forbids trusting what the client or remote server says the file is from
/// their `Content-Type` and we try to detect it ourselves. Also returns
/// `attachment` if the Content-Type does not match what we detected.
///
/// TODO: add a "strict" function for comparing the Content-Type with what we
/// detected: `file_type.mime_type() != content_type`
#[must_use]
#[tracing::instrument(skip(buf))]
pub fn content_disposition_type(buf: &[u8], content_type: &Option<String>) -> &'static str {
let Some(file_type) = infer::get(buf) else {
debug_info!("Failed to infer the file's contents, assuming attachment for Content-Disposition");
return ATTACHMENT;
};
debug_info!("MIME type: {}", file_type.mime_type());
debug_info!("detected MIME type: {}", file_type.mime_type());
match file_type.matcher_type() {
MatcherType::Image | MatcherType::Audio | MatcherType::Text | MatcherType::Video => {
if file_type.mime_type().contains("xml") {
ATTACHMENT
} else {
INLINE
}
},
_ => ATTACHMENT,
if ALLOWED_INLINE_CONTENT_TYPES.contains(&file_type.mime_type()) {
INLINE
} else {
ATTACHMENT
}
}