feat: Add media serving functionality with optional metadata stripping

libertas_core/Cargo.toml

@@ -15,3 +15,5 @@ serde = { version = "1.0.228", features = ["derive"] }
 nom-exif = { version = "2.5.4", features = ["serde", "async", "tokio"] }
 dotenvy = "0.15.7"
 config = "0.15.19"
+image = "0.25.8"
+tokio = { version = "1.48.0", features = ["rt"] }

libertas_core/src/media_utils.rs

@@ -4,7 +4,9 @@ use std::{
 };
 
 use chrono::{DateTime, Datelike, NaiveDateTime, Utc};
+use image::{ImageFormat, load_from_memory};
 use nom_exif::{AsyncMediaParser, AsyncMediaSource, ExifIter, MediaParser, MediaSource, TrackInfo};
+use tokio::task;
 
 use crate::{
     error::{CoreError, CoreResult},
@@ -190,3 +192,34 @@ pub fn is_invalid_exif_tag(tag_name: &str, tag_value: &str) -> bool {
 
     false
 }
+
+pub async fn strip_metadata_from_bytes(
+    file_bytes: Vec<u8>,
+    mime_type: &str,
+) -> CoreResult<Vec<u8>> {
+    if mime_type != "image/jpeg" && mime_type != "image/png" {
+        return Ok(file_bytes);
+    }
+
+    let mime_type = mime_type.to_string();
+
+    task::spawn_blocking(move || -> CoreResult<Vec<u8>> {
+        let img = load_from_memory(&file_bytes)
+            .map_err(|e| CoreError::Unknown(format!("Failed to parse image: {}", e)))?;
+
+        let mut buffer = std::io::Cursor::new(Vec::new());
+
+        match mime_type.as_str() {
+            "image/jpeg" => img
+                .write_to(&mut buffer, ImageFormat::Jpeg)
+                .map_err(|e| CoreError::Unknown(format!("Failed to re-encode JPEG: {}", e)))?,
+            "image/png" => img
+                .write_to(&mut buffer, ImageFormat::Png)
+                .map_err(|e| CoreError::Unknown(format!("Failed to re-encode PNG: {}", e)))?,
+            _ => unreachable!(), // We already checked this
+        }
+        Ok(buffer.into_inner())
+    })
+    .await
+    .map_err(|e| CoreError::Unknown(format!("Blocking task failed: {}", e)))?
+}

libertas_core/src/services.rs

@@ -26,6 +26,7 @@ pub trait MediaService: Send + Sync {
     async fn get_media_filepath(&self, id: Uuid, user_id: Option<Uuid>) -> CoreResult<String>;
     async fn get_media_thumbnail_path(&self, id: Uuid, user_id: Option<Uuid>)
     -> CoreResult<String>;
+    async fn get_media_for_serving(&self, id: Uuid, user_id: Option<Uuid>) -> CoreResult<Media>;
     async fn delete_media(&self, id: Uuid, user_id: Uuid) -> CoreResult<()>;
 }