Create file metadata endpoint

This allows retrieving create/modify date as well as file size for any
file in the BASE_PATH.

src/data/mod.rs

@@ -1,5 +1,6 @@
-use std::str::FromStr;
+use std::{fs, str::FromStr};
 
+use chrono::{DateTime, Utc};
 use log::error;
 
 use actix_web::error::ErrorUnauthorized;
@@ -92,6 +93,29 @@ pub struct AddFavoriteRequest {
     pub path: String,
 }
 
+#[derive(Debug, Serialize)]
+pub struct MetadataResponse {
+    pub created: Option<i64>,
+    pub modified: Option<i64>,
+    pub size: u64,
+}
+
+impl From<fs::Metadata> for MetadataResponse {
+    fn from(metadata: fs::Metadata) -> Self {
+        MetadataResponse {
+            created: metadata.created().ok().map(|created| {
+                let utc: DateTime<Utc> = created.into();
+                utc.timestamp()
+            }),
+            modified: metadata.modified().ok().map(|modified| {
+                let utc: DateTime<Utc> = modified.into();
+                utc.timestamp()
+            }),
+            size: metadata.len(),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::Claims;