update

src/modules/message/attachment.rs

@@ -40,7 +40,7 @@ pub async fn retrieve_attachment_content(
     let (_, eml) = reattach_eml_content(account_id, envelope_id).await?;
     let message = MessageParser::default().parse(&eml).ok_or_else(|| {
         raise_error!(
-            "Failed to parse parent EML".into(),
+            "Failed to parse EML".into(),
             ErrorCode::InternalError
         )
     })?;
@@ -51,7 +51,7 @@ pub async fn retrieve_attachment_content(
         .map(|att| att.contents())
         .ok_or_else(|| {
             raise_error!(
-                "Target nested EML not found".into(),
+                "Target attachment not found".into(),
                 ErrorCode::ResourceNotFound
             )
         })?;

src/modules/message/search.rs

@@ -122,6 +122,7 @@ pub struct AttachmentSearchFilter {
     pub max_size: Option<u64>,
 
     pub attachment_name: Option<String>,
+    pub content_hash: Option<String>,
 
     pub tags: Option<HashSet<String>>,
     pub attachment_extension: Option<String>,