clippy lint fix

17 files changed, 154 insertions, 131 deletions

diff --git a/.albatros b/.albatros
new file mode 100755
index 0000000..6439de6
--- /dev/null
+++ b/.albatros
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+nix build --print-build-logs .#packages.x86_64-unknown-linux-musl.debug
diff --git a/flake.nix b/flake.nix
index 55aacd7..3bf91b2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -80,6 +80,7 @@
         echo
 
         export NIX_RUST_BUILD_FLAGS="''${NIX_RUST_BUILD_FLAGS} --deny warnings"
+        export NIX_RUST_LINK_FLAGS="''${NIX_RUST_LINK_FLAGS} --deny warnings"
         export RUSTC="''${CLIPPY_DRIVER}"
     '');
     rustDebug = pkgs.rustBuilder.makePackageSet({
diff --git a/src/bayou.rs b/src/bayou.rs
index 2d83ce3..cbfb414 100644
--- a/src/bayou.rs
+++ b/src/bayou.rs
@@ -103,9 +103,12 @@ impl<S: BayouState> Bayou<S> {
             } else {
                 debug!("(sync) loading checkpoint: {}", key);
 
-                let mut gor = GetObjectRequest::default();
-                gor.bucket = self.bucket.clone();
-                gor.key = key.to_string();
+                let gor = GetObjectRequest {
+                    bucket: self.bucket.clone(),
+                    key: key.to_string(),
+                    ..Default::default()
+                };
+
                 let obj_res = self.s3.get_object(gor).await?;
 
                 let obj_body = obj_res.body.ok_or(anyhow!("Missing object body"))?;
@@ -173,7 +176,7 @@ impl<S: BayouState> Bayou<S> {
             }
             match &val.value[0] {
                 K2vValue::Value(v) => {
-                    let op = open_deserialize::<S::Op>(&v, &self.key)?;
+                    let op = open_deserialize::<S::Op>(v, &self.key)?;
                     debug!("(sync) operation {}: {} {:?}", tsstr, base64::encode(v), op);
                     ops.push((ts, op));
                 }
@@ -381,10 +384,12 @@ impl<S: BayouState> Bayou<S> {
         let cryptoblob = seal_serialize(&state_cp, &self.key)?;
         debug!("(cp) checkpoint body length: {}", cryptoblob.len());
 
-        let mut por = PutObjectRequest::default();
-        por.bucket = self.bucket.clone();
-        por.key = format!("{}/checkpoint/{}", self.path, ts_cp.to_string());
-        por.body = Some(cryptoblob.into());
+        let por = PutObjectRequest{
+            bucket: self.bucket.clone(),
+            key: format!("{}/checkpoint/{}", self.path, ts_cp.to_string()),
+            body: Some(cryptoblob.into()),
+            ..Default::default()
+        };
         self.s3.put_object(por).await?;
 
         // Drop old checkpoints (but keep at least CHECKPOINTS_TO_KEEP of them)
@@ -395,9 +400,11 @@ impl<S: BayouState> Bayou<S> {
             // Delete blobs
             for (_ts, key) in existing_checkpoints[..last_to_keep].iter() {
                 debug!("(cp) drop old checkpoint {}", key);
-                let mut dor = DeleteObjectRequest::default();
-                dor.bucket = self.bucket.clone();
-                dor.key = key.to_string();
+                let dor = DeleteObjectRequest {
+                    bucket: self.bucket.clone(),
+                    key: key.to_string(),
+                    ..Default::default()
+                };
                 self.s3.delete_object(dor).await?;
             }
 
@@ -430,10 +437,12 @@ impl<S: BayouState> Bayou<S> {
     async fn list_checkpoints(&self) -> Result<Vec<(Timestamp, String)>> {
         let prefix = format!("{}/checkpoint/", self.path);
 
-        let mut lor = ListObjectsV2Request::default();
-        lor.bucket = self.bucket.clone();
-        lor.max_keys = Some(1000);
-        lor.prefix = Some(prefix.clone());
+        let lor = ListObjectsV2Request{
+            bucket: self.bucket.clone(),
+            max_keys: Some(1000),
+            prefix: Some(prefix.clone()),
+            ..Default::default()
+        };
 
         let checkpoints_res = self.s3.list_objects_v2(lor).await?;
 
@@ -537,6 +546,8 @@ pub struct Timestamp {
 }
 
 impl Timestamp {
+    #[allow(dead_code)]
+    // 2023-05-15 try to make clippy happy and not sure if this fn will be used in the future.
     pub fn now() -> Self {
         let mut rng = thread_rng();
         Self {
@@ -563,7 +574,7 @@ impl ToString for Timestamp {
         let mut bytes = [0u8; 16];
         bytes[0..8].copy_from_slice(&u64::to_be_bytes(self.msec));
         bytes[8..16].copy_from_slice(&u64::to_be_bytes(self.rand));
-        hex::encode(&bytes)
+        hex::encode(bytes)
     }
 }
 
diff --git a/src/cryptoblob.rs b/src/cryptoblob.rs
index 395ae21..327a642 100644
--- a/src/cryptoblob.rs
+++ b/src/cryptoblob.rs
@@ -36,7 +36,7 @@ pub fn seal(plainblob: &[u8], key: &Key) -> Result<Vec<u8>> {
     use secretbox::{gen_nonce, NONCEBYTES};
 
     // Compress data using zstd
-    let mut reader = &plainblob[..];
+    let mut reader = plainblob;
     let zstdblob = zstd_encode(&mut reader, 0)?;
 
     // Encrypt
@@ -63,5 +63,5 @@ pub fn seal_serialize<T: Serialize>(obj: T, key: &Key) -> Result<Vec<u8>> {
         .with_string_variants();
     obj.serialize(&mut se)?;
 
-    Ok(seal(&wr, key)?)
+    seal(&wr, key)
 }
diff --git a/src/imap/command/anonymous.rs b/src/imap/command/anonymous.rs
index 3ac1f20..d258bd3 100644
--- a/src/imap/command/anonymous.rs
+++ b/src/imap/command/anonymous.rs
@@ -15,7 +15,7 @@ pub struct AnonymousContext<'a> {
     pub login_provider: Option<&'a ArcLoginProvider>,
 }
 
-pub async fn dispatch<'a>(ctx: AnonymousContext<'a>) -> Result<(Response, flow::Transition)> {
+pub async fn dispatch(ctx: AnonymousContext<'_>) -> Result<(Response, flow::Transition)> {
     match &ctx.req.command.body {
         CommandBody::Noop => Ok((Response::ok("Noop completed.")?, flow::Transition::None)),
         CommandBody::Capability => ctx.capability().await,
diff --git a/src/imap/command/authenticated.rs b/src/imap/command/authenticated.rs
index dc8b5a8..2deb723 100644
--- a/src/imap/command/authenticated.rs
+++ b/src/imap/command/authenticated.rs
@@ -25,7 +25,7 @@ pub struct AuthenticatedContext<'a> {
     pub user: &'a Arc<User>,
 }
 
-pub async fn dispatch<'a>(ctx: AuthenticatedContext<'a>) -> Result<(Response, flow::Transition)> {
+pub async fn dispatch(ctx: AuthenticatedContext<'_>) -> Result<(Response, flow::Transition)> {
     match &ctx.req.command.body {
         CommandBody::Create { mailbox } => ctx.create(mailbox).await,
         CommandBody::Delete { mailbox } => ctx.delete(mailbox).await,
@@ -150,9 +150,7 @@ impl<'a> AuthenticatedContext<'a> {
             for (i, _) in mb.match_indices(MAILBOX_HIERARCHY_DELIMITER) {
                 if i > 0 {
                     let smb = &mb[..i];
-                    if !vmailboxes.contains_key(&smb) {
-                        vmailboxes.insert(smb, false);
-                    }
+                    vmailboxes.entry(smb).or_insert(false);
                 }
             }
             vmailboxes.insert(mb, true);
@@ -160,7 +158,7 @@ impl<'a> AuthenticatedContext<'a> {
 
         let mut ret = vec![];
         for (mb, is_real) in vmailboxes.iter() {
-            if matches_wildcard(&wildcard, &mb) {
+            if matches_wildcard(&wildcard, mb) {
                 let mailbox = mb
                     .to_string()
                     .try_into()
diff --git a/src/imap/command/examined.rs b/src/imap/command/examined.rs
index 8da68f8..1740b39 100644
--- a/src/imap/command/examined.rs
+++ b/src/imap/command/examined.rs
@@ -23,7 +23,7 @@ pub struct ExaminedContext<'a> {
     pub mailbox: &'a mut MailboxView,
 }
 
-pub async fn dispatch<'a>(ctx: ExaminedContext<'a>) -> Result<(Response, flow::Transition)> {
+pub async fn dispatch(ctx: ExaminedContext<'_>) -> Result<(Response, flow::Transition)> {
     match &ctx.req.command.body {
         // CLOSE in examined state is not the same as in selected state
         // (in selected state it also does an EXPUNGE, here it doesn't)
diff --git a/src/imap/command/selected.rs b/src/imap/command/selected.rs
index 0be8ff2..90a00ee 100644
--- a/src/imap/command/selected.rs
+++ b/src/imap/command/selected.rs
@@ -21,7 +21,7 @@ pub struct SelectedContext<'a> {
     pub mailbox: &'a mut MailboxView,
 }
 
-pub async fn dispatch<'a>(ctx: SelectedContext<'a>) -> Result<(Response, flow::Transition)> {
+pub async fn dispatch(ctx: SelectedContext<'_>) -> Result<(Response, flow::Transition)> {
     match &ctx.req.command.body {
         // Only write commands here, read commands are handled in
         // `examined.rs`
diff --git a/src/imap/mailbox_view.rs b/src/imap/mailbox_view.rs
index 028ed09..fbfdb30 100644
--- a/src/imap/mailbox_view.rs
+++ b/src/imap/mailbox_view.rs
@@ -126,7 +126,7 @@ impl MailboxView {
                         data.push(Body::Data(Data::Fetch {
                             seq_or_uid: NonZeroU32::try_from((i + 1) as u32).unwrap(),
                             attributes: vec![
-                                MessageAttribute::Uid((*uid).try_into().unwrap()),
+                                MessageAttribute::Uid(*uid),
                                 MessageAttribute::Flags(
                                     flags.iter().filter_map(|f| string_to_flag(f)).collect(),
                                 ),
@@ -387,10 +387,8 @@ impl MailboxView {
                         }
                     }
                     FetchAttribute::InternalDate => {
-                        attributes.push(MessageAttribute::InternalDate(MyDateTime(
-                            Utc.fix()
-                                .timestamp(i64::try_from(meta.internaldate / 1000)?, 0),
-                        )));
+                        let dt = Utc.fix().timestamp_opt(i64::try_from(meta.internaldate / 1000)?, 0).earliest().ok_or(anyhow!("Unable to parse internal date"))?;
+                        attributes.push(MessageAttribute::InternalDate(MyDateTime(dt)));
                     }
                 }
             }
@@ -529,8 +527,7 @@ impl MailboxView {
             .known_state
             .idx_by_flag
             .flags()
-            .map(|f| string_to_flag(f))
-            .flatten()
+            .filter_map(|f| string_to_flag(f))
             .collect();
         for f in DEFAULT_FLAGS.iter() {
             if !flags.contains(f) {
@@ -569,7 +566,7 @@ fn string_to_flag(f: &str) -> Option<Flag> {
             "\\Deleted" => Some(Flag::Deleted),
             "\\Draft" => Some(Flag::Draft),
             "\\Recent" => Some(Flag::Recent),
-            _ => match Atom::try_from(f.strip_prefix('\\').unwrap().clone()) {
+            _ => match Atom::try_from(f.strip_prefix('\\').unwrap().to_string()) {
                 Err(_) => {
                     tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
                     None
@@ -577,7 +574,7 @@ fn string_to_flag(f: &str) -> Option<Flag> {
                 Ok(a) => Some(Flag::Extension(a)),
             },
         },
-        Some(_) => match Atom::try_from(f.clone()) {
+        Some(_) => match Atom::try_from(f.to_string()) {
             Err(_) => {
                 tracing::error!(flag=%f, "Unable to encode flag as IMAP atom");
                 None
@@ -623,7 +620,7 @@ fn message_envelope(msg: &mail_parser::Message<'_>) -> Envelope {
         ),
         from: from.clone(),
         sender: convert_addresses(msg.sender()).unwrap_or(from.clone()),
-        reply_to: convert_addresses(msg.reply_to()).unwrap_or(from.clone()),
+        reply_to: convert_addresses(msg.reply_to()).unwrap_or(from),
         to: convert_addresses(msg.to()).unwrap_or(vec![]),
         cc: convert_addresses(msg.cc()).unwrap_or(vec![]),
         bcc: convert_addresses(msg.bcc()).unwrap_or(vec![]),
@@ -639,7 +636,7 @@ fn convert_addresses(a: &mail_parser::HeaderValue<'_>) -> Option<Vec<Address>> {
     match a {
         mail_parser::HeaderValue::Address(a) => Some(vec![convert_address(a)]),
         mail_parser::HeaderValue::AddressList(l) => {
-            Some(l.iter().map(|a| convert_address(a)).collect())
+            Some(l.iter().map(convert_address).collect())
         }
         mail_parser::HeaderValue::Empty => None,
         _ => {
@@ -722,7 +719,7 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
             })
         }
         PartType::Text(bp) | PartType::Html(bp) => {
-            let (attrs, mut basic) = headers_to_basic_fields(&part, bp.len())?;
+            let (attrs, mut basic) = headers_to_basic_fields(part, bp.len())?;
 
             // If the charset is not defined, set it to "us-ascii"
             if attrs.charset.is_none() {
@@ -736,10 +733,8 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
             // difference between MIME and raw emails, hence raw emails have no subtypes.
             let subtype = part
                 .content_type()
-                .map(|h| h.c_subtype.as_ref())
-                .flatten()
-                .map(|st| IString::try_from(st.to_string()).ok())
-                .flatten()
+                .and_then(|h| h.c_subtype.as_ref())
+                .and_then(|st| IString::try_from(st.to_string()).ok())
                 .unwrap_or(unchecked_istring("plain"));
 
             let number_of_lines = msg
@@ -761,7 +756,7 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
             })
         }
         PartType::Binary(bp) | PartType::InlineBinary(bp) => {
-            let (_, basic) = headers_to_basic_fields(&part, bp.len())?;
+            let (_, basic) = headers_to_basic_fields(part, bp.len())?;
 
             let ct = part
                 .content_type()
@@ -790,7 +785,7 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
             })
         }
         PartType::Message(inner) => {
-            let (_, basic) = headers_to_basic_fields(&part, inner.raw_message().len())?;
+            let (_, basic) = headers_to_basic_fields(part, inner.raw_message().len())?;
 
             // We do not count the number of lines but the number of line
             // feeds to have the same behavior as Dovecot and Cyrus.
@@ -803,7 +798,7 @@ fn build_imap_email_struct<'a>(msg: &Message<'a>, part: &MessagePart<'a>) -> Res
                     specific: SpecificFields::Message {
                         envelope: message_envelope(inner),
                         body_structure: Box::new(build_imap_email_struct(
-                                &inner,
+                                inner,
                                 inner.root_part(),
                                 )?),
 
@@ -850,8 +845,7 @@ fn attrs_to_params<'a>(bp: &impl MimeHeaders<'a>) -> (SpecialAttrs, Vec<(IString
     // Try to extract Content-Type attributes from headers
     let attrs = match bp
         .content_type()
-        .map(|c| c.attributes.as_ref())
-        .flatten()
+        .and_then(|c| c.attributes.as_ref())
     {
         Some(v) => v,
         _ => return (SpecialAttrs::default(), vec![]),
@@ -896,14 +890,12 @@ fn headers_to_basic_fields<'a>(
 
         id: NString(
             bp.content_id()
-                .map(|ci| IString::try_from(ci.to_string()).ok())
-                .flatten(),
+                .and_then(|ci| IString::try_from(ci.to_string()).ok()),
         ),
 
         description: NString(
             bp.content_description()
-                .map(|cd| IString::try_from(cd.to_string()).ok())
-                .flatten(),
+                .and_then(|cd| IString::try_from(cd.to_string()).ok()),
         ),
 
         /*
@@ -913,8 +905,7 @@ fn headers_to_basic_fields<'a>(
          */
         content_transfer_encoding: bp
             .content_transfer_encoding()
-            .map(|h| IString::try_from(h.to_string()).ok())
-            .flatten()
+            .and_then(|h| IString::try_from(h.to_string()).ok())
             .unwrap_or(unchecked_istring("7bit")),
 
         size: u32::try_from(size)?,
@@ -1023,7 +1014,7 @@ fn get_message_section<'a>(
     }
 }
 
-fn map_subpart_msg<'a, F, R>(msg: &Message<'a>, path: &[NonZeroU32], f: F) -> Result<R>
+fn map_subpart_msg<F, R>(msg: &Message<'_>, path: &[NonZeroU32], f: F) -> Result<R>
 where
     F: FnOnce(&Message<'_>) -> Result<R>,
 {
@@ -1035,14 +1026,14 @@ where
             .get(path[0].get() as usize - 1)
             .ok_or(anyhow!("No such subpart: {}", path[0]))?;
         if let PartType::Message(msg_attach) = &part.body {
-            map_subpart_msg(&msg_attach, &path[1..], f)
+            map_subpart_msg(msg_attach, &path[1..], f)
         } else {
             bail!("Subpart is not a message: {}", path[0]);
         }
     }
 }
 
-fn map_subpart<'a, F, R>(msg: &Message<'a>, path: &[NonZeroU32], f: F) -> Result<R>
+fn map_subpart<F, R>(msg: &Message<'_>, path: &[NonZeroU32], f: F) -> Result<R>
 where
     F: FnOnce(&Message<'_>, &MessagePart<'_>) -> Result<R>,
 {
@@ -1055,12 +1046,10 @@ where
             .ok_or(anyhow!("No such subpart: {}", path[0]))?;
         if path.len() == 1 {
             f(msg, part)
+        } else if let PartType::Message(msg_attach) = &part.body {
+            map_subpart(msg_attach, &path[1..], f)
         } else {
-            if let PartType::Message(msg_attach) = &part.body {
-                map_subpart(&msg_attach, &path[1..], f)
-            } else {
-                bail!("Subpart is not a message: {}", path[0]);
-            }
+            bail!("Subpart is not a message: {}", path[0]);
         }
     }
 }
diff --git a/src/login/mod.rs b/src/login/mod.rs
index 0605d4e..6d2ec71 100644
--- a/src/login/mod.rs
+++ b/src/login/mod.rs
@@ -190,8 +190,8 @@ impl CryptoKeys {
 
         // Write values to storage
         k2v.insert_batch(&[
-            k2v_insert_single_key("keys", "salt", salt_ct, &ident_salt),
-            k2v_insert_single_key("keys", "public", public_ct, &keys.public),
+            k2v_insert_single_key("keys", "salt", salt_ct, ident_salt),
+            k2v_insert_single_key("keys", "public", public_ct, keys.public),
             k2v_insert_single_key("keys", &password_sortkey, None, &password_blob),
         ])
         .await
@@ -223,8 +223,8 @@ impl CryptoKeys {
 
         // Write values to storage
         k2v.insert_batch(&[
-            k2v_insert_single_key("keys", "salt", salt_ct, &ident_salt),
-            k2v_insert_single_key("keys", "public", public_ct, &keys.public),
+            k2v_insert_single_key("keys", "salt", salt_ct, ident_salt),
+            k2v_insert_single_key("keys", "public", public_ct, keys.public),
         ])
         .await
         .context("InsertBatch for salt and public")?;
@@ -265,7 +265,7 @@ impl CryptoKeys {
         // Try to open blob
         let kdf_salt = &password_blob[..32];
         let password_openned =
-            user_secrets.try_open_encrypted_keys(&kdf_salt, password, &password_blob[32..])?;
+            user_secrets.try_open_encrypted_keys(kdf_salt, password, &password_blob[32..])?;
 
         let keys = Self::deserialize(&password_openned)?;
         if keys.public != expected_public {
@@ -332,7 +332,7 @@ impl CryptoKeys {
                 if entry.value.iter().any(|x| matches!(x, K2vValue::Value(_))) {
                     bail!("password already exists");
                 }
-                Some(entry.causality.clone())
+                Some(entry.causality)
             }
         };
 
@@ -523,7 +523,7 @@ impl CryptoKeys {
 impl UserSecrets {
     fn derive_password_key_with(user_secret: &str, kdf_salt: &[u8], password: &str) -> Result<Key> {
         let tmp = format!("{}\n\n{}", user_secret, password);
-        Ok(Key::from_slice(&argon2_kdf(&kdf_salt, tmp.as_bytes(), 32)?).unwrap())
+        Ok(Key::from_slice(&argon2_kdf(kdf_salt, tmp.as_bytes(), 32)?).unwrap())
     }
 
     fn derive_password_key(&self, kdf_salt: &[u8], password: &str) -> Result<Key> {
@@ -579,7 +579,7 @@ pub fn k2v_read_single_key<'a>(
     tombstones: bool,
 ) -> BatchReadOp<'a> {
     BatchReadOp {
-        partition_key: partition_key,
+        partition_key,
         filter: Filter {
             start: Some(sort_key),
             end: None,
diff --git a/src/login/static_provider.rs b/src/login/static_provider.rs
index 5ea765f..b9be5a6 100644
--- a/src/login/static_provider.rs
+++ b/src/login/static_provider.rs
@@ -151,7 +151,7 @@ pub fn verify_password(password: &str, hash: &str) -> Result<bool> {
         Argon2,
     };
     let parsed_hash =
-        PasswordHash::new(&hash).map_err(|e| anyhow!("Invalid hashed password: {}", e))?;
+        PasswordHash::new(hash).map_err(|e| anyhow!("Invalid hashed password: {}", e))?;
     Ok(Argon2::default()
         .verify_password(password.as_bytes(), &parsed_hash)
         .is_ok())
diff --git a/src/mail/incoming.rs b/src/mail/incoming.rs
index 26ca52a..290f1b3 100644
--- a/src/mail/incoming.rs
+++ b/src/mail/incoming.rs
@@ -68,7 +68,7 @@ async fn incoming_mail_watch_process_internal(
 
             let wait_new_mail = async {
                 loop {
-                    match k2v_wait_value_changed(&k2v, &INCOMING_PK, &INCOMING_WATCH_SK, &prev_ct)
+                    match k2v_wait_value_changed(&k2v, INCOMING_PK, INCOMING_WATCH_SK, &prev_ct)
                         .await
                     {
                         Ok(cv) => break cv,
@@ -104,7 +104,7 @@ async fn incoming_mail_watch_process_internal(
         info!("User still available");
 
         // If INBOX no longer is same mailbox, open new mailbox
-        let inbox_id = rx_inbox_id.borrow().clone();
+        let inbox_id = *rx_inbox_id.borrow();
         if let Some((id, uidvalidity)) = inbox_id {
             if Some(id) != inbox.as_ref().map(|b| b.id) {
                 match user.open_mailbox_by_id(id, uidvalidity).await {
@@ -145,10 +145,12 @@ async fn handle_incoming_mail(
     inbox: &Arc<Mailbox>,
     lock_held: &watch::Receiver<bool>,
 ) -> Result<()> {
-    let mut lor = ListObjectsV2Request::default();
-    lor.bucket = user.creds.storage.bucket.clone();
-    lor.max_keys = Some(1000);
-    lor.prefix = Some("incoming/".into());
+    let lor = ListObjectsV2Request {
+        bucket: user.creds.storage.bucket.clone(),
+        max_keys: Some(1000),
+        prefix: Some("incoming/".into()),
+        ..Default::default()
+    };
     let mails_res = s3.list_objects_v2(lor).await?;
 
     for object in mails_res.contents.unwrap_or_default() {
@@ -178,9 +180,11 @@ async fn move_incoming_message(
     let object_key = format!("incoming/{}", id);
 
     // 1. Fetch message from S3
-    let mut gor = GetObjectRequest::default();
-    gor.bucket = user.creds.storage.bucket.clone();
-    gor.key = object_key.clone();
+    let gor = GetObjectRequest {
+        bucket: user.creds.storage.bucket.clone(),
+        key: object_key.clone(),
+        ..Default::default()
+    };
     let get_result = s3.get_object(gor).await?;
 
     // 1.a decrypt message key from headers
@@ -218,9 +222,11 @@ async fn move_incoming_message(
         .await?;
 
     // 3 delete from incoming
-    let mut dor = DeleteObjectRequest::default();
-    dor.bucket = user.creds.storage.bucket.clone();
-    dor.key = object_key.clone();
+    let dor = DeleteObjectRequest {
+        bucket: user.creds.storage.bucket.clone(),
+        key: object_key.clone(),
+        ..Default::default()
+    };
     s3.delete_object(dor).await?;
 
     Ok(())
@@ -441,15 +447,17 @@ impl EncryptedMessage {
             sodiumoxide::crypto::sealedbox::seal(self.key.as_ref(), &creds.public_key);
         let key_header = base64::encode(&encrypted_key);
 
-        let mut por = PutObjectRequest::default();
-        por.bucket = creds.storage.bucket.clone();
-        por.key = format!("incoming/{}", gen_ident().to_string());
-        por.metadata = Some(
+        let por = PutObjectRequest {
+            bucket: creds.storage.bucket.clone(),
+            key: format!("incoming/{}", gen_ident()),
+            metadata:  Some(
             [(MESSAGE_KEY.to_string(), key_header)]
                 .into_iter()
                 .collect::<HashMap<_, _>>(),
-        );
-        por.body = Some(self.encrypted_body.clone().into());
+            ),
+            body: Some(self.encrypted_body.clone().into()),
+            ..Default::default()
+        };
         s3_client.put_object(por).await?;
 
         // Update watch key to signal new mail
diff --git a/src/mail/mailbox.rs b/src/mail/mailbox.rs
index a37c9ed..445dcfd 100644
--- a/src/mail/mailbox.rs
+++ b/src/mail/mailbox.rs
@@ -156,6 +156,7 @@ impl Mailbox {
 
     /// Move an email from an other Mailbox to this mailbox
     /// (use this when possible, as it allows for a certain number of storage optimizations)
+    #[allow(dead_code)]
     pub async fn move_from(&self, from: &Mailbox, uuid: UniqueIdent) -> Result<()> {
         if self.id == from.id {
             bail!("Cannot copy move same mailbox");
@@ -178,6 +179,8 @@ impl Mailbox {
 // Non standard but common flags:
 // https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
 struct MailboxInternal {
+    // 2023-05-15 will probably be used later.
+    #[allow(dead_code)]
     id: UniqueIdent,
     bucket: String,
     mail_path: String,
@@ -256,9 +259,11 @@ impl MailboxInternal {
     }
 
     async fn fetch_full(&self, id: UniqueIdent, message_key: &Key) -> Result<Vec<u8>> {
-        let mut gor = GetObjectRequest::default();
-        gor.bucket = self.bucket.clone();
-        gor.key = format!("{}/{}", self.mail_path, id);
+        let gor = GetObjectRequest {
+            bucket: self.bucket.clone(),
+            key: format!("{}/{}", self.mail_path, id),
+            ..Default::default()
+        };
 
         let obj_res = self.s3.get_object(gor).await?;
 
@@ -266,7 +271,7 @@ impl MailboxInternal {
         let mut buf = Vec::with_capacity(obj_res.content_length.unwrap_or(128) as usize);
         obj_body.into_async_read().read_to_end(&mut buf).await?;
 
-        Ok(cryptoblob::open(&buf, &message_key)?)
+        cryptoblob::open(&buf, message_key)
     }
 
     // ---- Functions for changing the mailbox ----
@@ -292,17 +297,19 @@ impl MailboxInternal {
         ident: Option<UniqueIdent>,
         flags: &[Flag],
     ) -> Result<(ImapUidvalidity, ImapUid)> {
-        let ident = ident.unwrap_or_else(|| gen_ident());
+        let ident = ident.unwrap_or_else(gen_ident);
         let message_key = gen_key();
 
         futures::try_join!(
             async {
                 // Encrypt and save mail body
                 let message_blob = cryptoblob::seal(mail.raw, &message_key)?;
-                let mut por = PutObjectRequest::default();
-                por.bucket = self.bucket.clone();
-                por.key = format!("{}/{}", self.mail_path, ident);
-                por.body = Some(message_blob.into());
+                let por = PutObjectRequest {
+                    bucket: self.bucket.clone(),
+                    key: format!("{}/{}", self.mail_path, ident),
+                    body: Some(message_blob.into()),
+                    ..Default::default()
+                };
                 self.s3.put_object(por).await?;
                 Ok::<_, anyhow::Error>(())
             },
@@ -349,11 +356,13 @@ impl MailboxInternal {
         futures::try_join!(
             async {
                 // Copy mail body from previous location
-                let mut cor = CopyObjectRequest::default();
-                cor.bucket = self.bucket.clone();
-                cor.key = format!("{}/{}", self.mail_path, ident);
-                cor.copy_source = format!("{}/{}", self.bucket, s3_key);
-                cor.metadata_directive = Some("REPLACE".into());
+                let cor = CopyObjectRequest {
+                    bucket: self.bucket.clone(),
+                    key: format!("{}/{}", self.mail_path, ident),
+                    copy_source: format!("{}/{}", self.bucket, s3_key),
+                    metadata_directive: Some("REPLACE".into()),
+                    ..Default::default()
+                };
                 self.s3.copy_object(cor).await?;
                 Ok::<_, anyhow::Error>(())
             },
@@ -393,9 +402,11 @@ impl MailboxInternal {
         futures::try_join!(
             async {
                 // Delete mail body from S3
-                let mut dor = DeleteObjectRequest::default();
-                dor.bucket = self.bucket.clone();
-                dor.key = format!("{}/{}", self.mail_path, ident);
+                let dor = DeleteObjectRequest{
+                    bucket: self.bucket.clone(),
+                    key: format!("{}/{}", self.mail_path, ident),
+                    ..Default::default()
+                };
                 self.s3.delete_object(dor).await?;
                 Ok::<_, anyhow::Error>(())
             },
@@ -422,6 +433,8 @@ impl MailboxInternal {
         Ok(new_id)
     }
 
+    #[allow(dead_code)]
+    // 2023-05-15 will probably be used later
     async fn move_from(&mut self, from: &mut MailboxInternal, id: UniqueIdent) -> Result<()> {
         self.copy_internal(from, id, id).await?;
         from.delete(id).await?;
@@ -450,10 +463,13 @@ impl MailboxInternal {
         futures::try_join!(
             async {
                 // Copy mail body from S3
-                let mut cor = CopyObjectRequest::default();
-                cor.bucket = self.bucket.clone();
-                cor.key = format!("{}/{}", self.mail_path, new_id);
-                cor.copy_source = format!("{}/{}/{}", from.bucket, from.mail_path, source_id);
+                let cor = CopyObjectRequest{
+                    bucket: self.bucket.clone(),
+                    key: format!("{}/{}", self.mail_path, new_id),
+                    copy_source: format!("{}/{}/{}", from.bucket, from.mail_path, source_id),
+                    ..Default::default()
+                };
+
                 self.s3.copy_object(cor).await?;
                 Ok::<_, anyhow::Error>(())
             },
@@ -491,7 +507,7 @@ fn dump(uid_index: &Bayou<UidIndex>) {
             s.table.get(ident).cloned().unwrap().1.join(", ")
         );
     }
-    println!("");
+    println!();
 }
 
 // ----
diff --git a/src/mail/mod.rs b/src/mail/mod.rs
index 3b0ae73..80c348a 100644
--- a/src/mail/mod.rs
+++ b/src/mail/mod.rs
@@ -9,6 +9,8 @@ pub mod user;
 
 // Internet Message Format
 // aka RFC 822 - RFC 2822 - RFC 5322
+// 2023-05-15 don't want to refactor this struct now.
+#[allow(clippy::upper_case_acronyms)]
 pub struct IMF<'a> {
     raw: &'a [u8],
     parsed: mail_parser::Message<'a>,
diff --git a/src/mail/uidindex.rs b/src/mail/uidindex.rs
index 43d6507..956b194 100644
--- a/src/mail/uidindex.rs
+++ b/src/mail/uidindex.rs
@@ -73,9 +73,9 @@ impl UidIndex {
 
     // INTERNAL functions to keep state consistent
 
-    fn reg_email(&mut self, ident: UniqueIdent, uid: ImapUid, flags: &Vec<Flag>) {
+    fn reg_email(&mut self, ident: UniqueIdent, uid: ImapUid, flags: &[Flag]) {
         // Insert the email in our table
-        self.table.insert(ident, (uid, flags.clone()));
+        self.table.insert(ident, (uid, flags.to_owned()));
 
         // Update the indexes/caches
         self.idx_by_uid.insert(uid, ident);
@@ -205,7 +205,7 @@ impl FlagIndex {
     fn new() -> Self {
         Self(HashMap::new())
     }
-    fn insert(&mut self, uid: ImapUid, flags: &Vec<Flag>) {
+    fn insert(&mut self, uid: ImapUid, flags: &[Flag]) {
         flags.iter().for_each(|flag| {
             self.0
                 .entry(flag.clone())
@@ -213,7 +213,7 @@ impl FlagIndex {
                 .insert(uid);
         });
     }
-    fn remove(&mut self, uid: ImapUid, flags: &Vec<Flag>) -> () {
+    fn remove(&mut self, uid: ImapUid, flags: &[Flag]) {
         for flag in flags.iter() {
             if let Some(set) = self.0.get_mut(flag) {
                 set.remove(&uid);
diff --git a/src/mail/user.rs b/src/mail/user.rs
index d921e6d..44e0081 100644
--- a/src/mail/user.rs
+++ b/src/mail/user.rs
@@ -257,7 +257,7 @@ impl User {
         let saved;
         let (inbox_id, inbox_uidvalidity) = match list.create_mailbox(INBOX) {
             CreatedMailbox::Created(i, v) => {
-                self.save_mailbox_list(&list, ct.clone()).await?;
+                self.save_mailbox_list(list, ct.clone()).await?;
                 saved = true;
                 (i, v)
             }
@@ -334,23 +334,17 @@ impl MailboxList {
     }
 
     fn has_mailbox(&self, name: &str) -> bool {
-        match self.0.get(name) {
-            Some(MailboxListEntry {
-                id_lww: (_, Some(_)),
-                ..
-            }) => true,
-            _ => false,
-        }
+        matches!(self.0.get(name), Some(MailboxListEntry {
+            id_lww: (_, Some(_)),
+            ..
+        }))
     }
 
     fn get_mailbox(&self, name: &str) -> Option<(ImapUidvalidity, Option<UniqueIdent>)> {
-        match self.0.get(name) {
-            None => None,
-            Some(MailboxListEntry {
-                id_lww: (_, mailbox_id),
-                uidvalidity,
-            }) => Some((*uidvalidity, *mailbox_id)),
-        }
+        self.0.get(name).map(|MailboxListEntry {
+            id_lww: (_, mailbox_id),
+            uidvalidity,
+        }| (*uidvalidity, *mailbox_id))
     }
 
     /// Ensures mailbox `name` maps to id `id`.
diff --git a/src/main.rs b/src/main.rs
index 4886679..4ca07d0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -121,7 +121,7 @@ async fn main() -> Result<()> {
 
     // Abort on panic (same behavior as in Go)
     std::panic::set_hook(Box::new(|panic_info| {
-        eprintln!("{}", panic_info.to_string());
+        eprintln!("{}", panic_info);
         eprintln!("{:?}", backtrace::Backtrace::new());
         std::process::abort();
     }));
@@ -292,7 +292,7 @@ fn make_user_secrets(c: UserSecretsArgs) -> UserSecrets {
         user_secret: c.user_secret,
         alternate_user_secrets: c
             .alternate_user_secrets
-            .split(",")
+            .split(',')
             .map(|x| x.trim())
             .filter(|x| !x.is_empty())
             .map(|x| x.to_string())