Add ThumbnailResponse struct with content_type and extension helper

examples/thumbnail.rs

@@ -14,37 +14,58 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     // Download thumbnail (small size, default)
     println!("Downloading thumbnail...");
-    let thumbnail = client
+    let response = client
         .assets()
         .thumbnail(asset_id)
         .size(AssetMediaSize::Thumbnail)
         .execute()
         .await?;
 
-    fs::write("/path/to/output/thumbnail.jpg", &thumbnail)?;
-    println!("Saved thumbnail: {} bytes", thumbnail.len());
+    println!("Content type: {}", response.content_type());
+    println!("Extension: {:?}", response.extension());
+
+    let ext = response.extension().unwrap_or("jpg");
+    let output_path = format!("/path/to/output/thumbnail.{}", ext);
+    fs::write(&output_path, response.data())?;
+    println!(
+        "Saved thumbnail: {} bytes to {}",
+        response.data().len(),
+        output_path
+    );
 
     // Download preview (medium size)
-    let preview = client
+    let response = client
         .assets()
         .thumbnail(asset_id)
         .size(AssetMediaSize::Preview)
         .execute()
         .await?;
 
-    fs::write("/path/to/output/preview.jpg", &preview)?;
-    println!("Saved preview: {} bytes", preview.len());
+    let ext = response.extension().unwrap_or("jpg");
+    let output_path = format!("/path/to/output/preview.{}", ext);
+    fs::write(&output_path, response.data())?;
+    println!(
+        "Saved preview: {} bytes to {}",
+        response.data().len(),
+        output_path
+    );
 
     // Download fullsize
-    let fullsize = client
+    let response = client
         .assets()
         .thumbnail(asset_id)
         .size(AssetMediaSize::Fullsize)
         .execute()
         .await?;
 
-    fs::write("/path/to/output/fullsize.jpg", &fullsize)?;
-    println!("Saved fullsize: {} bytes", fullsize.len());
+    let ext = response.extension().unwrap_or("jpg");
+    let output_path = format!("/path/to/output/fullsize.{}", ext);
+    fs::write(&output_path, response.data())?;
+    println!(
+        "Saved fullsize: {} bytes to {}",
+        response.data().len(),
+        output_path
+    );
 
     Ok(())
 }