feat: Detect animation in image files for fetch_preview (#574)

* Implement animated metadata TODOs for database and thumbnailing.

Signed-off-by: Assisting <erik@eriklabine.com>

* Run linter for code changes

Signed-off-by: Assisting <erik@eriklabine.com>

---------

Signed-off-by: Assisting <erik@eriklabine.com>

crates/services/autumn/src/api.rs

@@ -380,7 +380,7 @@ async fn fetch_preview(
 
     let hash = file.as_hash(&db).await?;
 
-    let is_animated = hash.content_type == "image/gif"; // TODO: extract this data from files
+    let is_animated = matches!(hash.metadata, Metadata::Image { animated: true, .. });
 
     // Only process image files and don't process GIFs if not avatar or icon
     if !matches!(hash.metadata, Metadata::Image { .. })

crates/services/autumn/src/exif.rs

@@ -16,7 +16,11 @@ pub async fn strip_metadata(
     mime: &str,
 ) -> Result<(Vec<u8>, Metadata)> {
     match &metadata {
-        Metadata::Image { width, height } => match mime {
+        Metadata::Image {
+            width,
+            height,
+            animated,
+        } => match mime {
             // // little_exif does not appear to parse JPEGs correctly? had 2/2 files fail
             // "image/jpeg" | "image/png" => {
             //     // use little_exif to strip metadata except for orientation and colour profile
@@ -93,7 +97,14 @@ pub async fn strip_metadata(
                     _ => (*width, *height),
                 };
 
-                Ok((bytes, Metadata::Image { width, height }))
+                Ok((
+                    bytes,
+                    Metadata::Image {
+                        width,
+                        height,
+                        animated: *animated,
+                    },
+                ))
             }
             // JXLs store EXIF data but we don't have the ability to write them
             "image/jxl" => Ok((buf, metadata)),

crates/services/autumn/src/metadata.rs

@@ -1,7 +1,7 @@
 use std::io::Cursor;
 
 use revolt_database::Metadata;
-use revolt_files::{image_size, video_size};
+use revolt_files::{image_size, is_animated, video_size};
 use tempfile::NamedTempFile;
 
 /// Intersection of what infer can detect and what image-rs supports
@@ -26,6 +26,7 @@ pub fn generate_metadata(f: &NamedTempFile, mime_type: &str) -> Metadata {
             .map(|(width, height)| Metadata::Image {
                 width: width as isize,
                 height: height as isize,
+                animated: is_animated(f, mime_type).unwrap_or(false),
             })
             .unwrap_or_default()
     } else if mime_type.starts_with("video/") {