add From<T> implementations for common Extractors

CHANGELOG.adoc

@@ -15,11 +15,13 @@
 
 https://github.com/oxidecomputer/dropshot/compare/v0.16.6\...HEAD[Full list of commits]
 
+* https://github.com/oxidecomputer/dropshot/pull/1520[#1520] Added `From<BodyType>` for `TypedBody<BodyType>` as a constructor
+
 == 0.16.6 (released 2025-12-10)
 
 https://github.com/oxidecomputer/dropshot/compare/v0.16.5\...v0.16.6[Full list of commits]
 
-* https://github.com/oxidecomputer/dropshot/pull/1490[#1490] Added `map` and `try_map` to `Query`, `Path`, `Header`, `HttpResponseOk`, `HttpResponseCreated`, `HttpResponseAccepted`, and `HttpResponseHeaders`, similar to `map` and `try_map` that already exist on `TypedBody`.
+* https://github.com/oxidecomputer/dropshot/pull/1490[#1490] Added `map` and `try_map` to `Query`, `Path`, `Header`, `HttpResponseOk`, `HttpResponseCreated`, `HttpResponseAccepted`, and `HttpResponseHeaders`, similar to `map` and `try_map` that already exist on `TypedBody`
 
 == 0.16.5 (released 2025-11-20)
 

dropshot/src/extractor/body.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Oxide Computer Company
+// Copyright 2026 Oxide Computer Company
 
 //! Body-related extractor(s)
 
@@ -66,6 +66,14 @@ impl<BodyType: JsonSchema + DeserializeOwned + Send + Sync>
     }
 }
 
+impl<BodyType: JsonSchema + DeserializeOwned + Send + Sync> From<BodyType>
+    for TypedBody<BodyType>
+{
+    fn from(value: BodyType) -> Self {
+        TypedBody { inner: value }
+    }
+}
+
 #[derive(Debug)]
 pub struct MultipartBody {
     pub content: multer::Multipart<'static>,
@@ -515,4 +523,19 @@ mod tests {
 
         assert!(r.is_ok())
     }
+
+    #[test]
+    fn test_typed_body_from() {
+        #[derive(Deserialize, JsonSchema, Clone, Debug, PartialEq, Eq)]
+        struct SampleBody {
+            field: String,
+        }
+
+        let sample = SampleBody { field: "value".to_string() };
+
+        let typed_body: crate::extractor::body::TypedBody<SampleBody> =
+            sample.clone().into();
+
+        assert_eq!(typed_body.into_inner(), sample);
+    }
 }