1 files changed, 49 insertions, 0 deletions
diff --git a/src/imap/attributes.rs b/src/imap/attributes.rs
new file mode 100644
index 0000000..7a55632
--- /dev/null
+++ b/src/imap/attributes.rs
@@ -0,0 +1,49 @@
+use imap_codec::imap_types::fetch::{MacroOrMessageDataItemNames, MessageDataItemName};
+
+/// Internal decisions based on fetched attributes
+/// passed by the client
+
+pub struct AttributesProxy {
+    pub attrs: Vec<MessageDataItemName<'static>>,
+}
+impl AttributesProxy {
+    pub fn new(attrs: &MacroOrMessageDataItemNames<'static>, is_uid_fetch: bool) -> Self {
+        // Expand macros
+        let mut fetch_attrs = match attrs {
+            MacroOrMessageDataItemNames::Macro(m) => {
+                use imap_codec::imap_types::fetch::Macro;
+                use MessageDataItemName::*;
+                match m {
+                    Macro::All => vec![Flags, InternalDate, Rfc822Size, Envelope],
+                    Macro::Fast => vec![Flags, InternalDate, Rfc822Size],
+                    Macro::Full => vec![Flags, InternalDate, Rfc822Size, Envelope, Body],
+                    _ => {
+                        tracing::error!("unimplemented macro");
+                        vec![]
+                    }
+                }
+            }
+            MacroOrMessageDataItemNames::MessageDataItemNames(a) => a.clone(),
+        };
+
+        // Handle uids
+        if is_uid_fetch && !fetch_attrs.contains(&MessageDataItemName::Uid) {
+            fetch_attrs.push(MessageDataItemName::Uid);
+        }
+
+        Self { attrs: fetch_attrs }
+    }
+
+    pub fn need_body(&self) -> bool {
+        self.attrs.iter().any(|x| {
+            matches!(
+                x,
+                MessageDataItemName::Body
+                    | MessageDataItemName::BodyExt { .. }
+                    | MessageDataItemName::Rfc822
+                    | MessageDataItemName::Rfc822Text
+                    | MessageDataItemName::BodyStructure
+            )
+        })
+    }
+}