feat(rust-client): Add a util to guess MIME type (#200)

Author: lcian

Cargo.lock

@@ -14,6 +14,7 @@ publish = true
 async-compression = { version = "0.4.27", features = ["tokio", "zstd"] }
 bytes = { workspace = true }
 futures-util = { workspace = true }
+infer = { version = "0.19.0", default-features = false }
 objectstore-types = { workspace = true }
 reqwest = { workspace = true, features = ["json", "stream"] }
 sentry-core = { version = ">=0.41", features = ["client"] }

clients/rust/Cargo.toml

@@ -7,6 +7,7 @@ mod delete;
 mod error;
 mod get;
 mod put;
+pub mod utils;
 
 pub use objectstore_types::{Compression, ExpirationPolicy};
 

clients/rust/src/lib.rs

@@ -109,6 +109,9 @@ impl PutBuilder {
     }
 
     /// Sets the content type of the object to be uploaded.
+    ///
+    /// You can use the utility function [`crate::utils::guess_mime_type`] to attempt to guess a
+    /// `content_type` based on magic bytes.
     pub fn content_type(mut self, content_type: impl Into<Cow<'static, str>>) -> Self {
         self.metadata.content_type = content_type.into();
         self

clients/rust/src/put.rs

@@ -0,0 +1,6 @@
+//! Utility functions that might be useful when working with Objectstore.
+
+/// Attempts to guess the MIME type from the given contents.
+pub fn guess_mime_type<T: AsRef<[u8]>>(contents: T) -> Option<&'static str> {
+    infer::get(contents.as_ref()).map(|kind| kind.mime_type())
+}