diff --git a/src/api/core/accounts.rs b/src/api/core/accounts.rs
index 3e54577..6127be0 100644
--- a/src/api/core/accounts.rs
+++ b/src/api/core/accounts.rs
@@ -41,12 +41,10 @@ fn register(data: JsonUpcase<RegisterData>, conn: DbConn) -> EmptyResult {
                     user_org.save(&conn);
                 };
                 user
+            } else if CONFIG.signups_allowed {
+                 err!("Account with this email already exists")
             } else {
-                if CONFIG.signups_allowed {
-                    err!("Account with this email already exists")
-                } else {
-                    err!("Registration not allowed")
-                }
+                 err!("Registration not allowed")
             }
         },
         None => {
@@ -305,7 +303,7 @@ fn password_hint(data: JsonUpcase<PasswordHintData>, conn: DbConn) -> EmptyResul
         if let Some(hint) = user.password_hint {
             err!(format!("Your password hint is: {}", &hint));
         } else {
-            err!(format!("Sorry, you have no password hint..."));
+            err!("Sorry, you have no password hint...");
         }
     }
 
diff --git a/src/api/core/ciphers.rs b/src/api/core/ciphers.rs
index b16ea00..2355482 100644
--- a/src/api/core/ciphers.rs
+++ b/src/api/core/ciphers.rs
@@ -376,11 +376,11 @@ fn put_cipher_share_seleted(data: JsonUpcase<ShareSelectedCipherData>, headers:
     let mut data: ShareSelectedCipherData = data.into_inner().data;
     let mut cipher_ids: Vec<String> = Vec::new();
 
-    if data.Ciphers.len() == 0 {
+    if data.Ciphers.is_empty() {
         err!("You must select at least one cipher.")
     }
 
-    if data.CollectionIds.len() == 0 {
+    if data.CollectionIds.is_empty() {
         err!("You must select at least one collection.")
     }
 
@@ -393,7 +393,7 @@ fn put_cipher_share_seleted(data: JsonUpcase<ShareSelectedCipherData>, headers:
 
     let attachments = Attachment::find_by_ciphers(cipher_ids, &conn);
 
-    if attachments.len() > 0 {
+    if !attachments.is_empty() {
         err!("Ciphers should not have any attachments.")
     }
 
diff --git a/src/api/core/organizations.rs b/src/api/core/organizations.rs
index 09f4fce..687ee35 100644
--- a/src/api/core/organizations.rs
+++ b/src/api/core/organizations.rs
@@ -289,7 +289,7 @@ fn get_collection_users(org_id: String, coll_id: String, _headers: AdminHeaders,
     .iter().map(|col_user|  {
         UserOrganization::find_by_user_and_org(&col_user.user_uuid, &org_id, &conn)
         .unwrap()
-        .to_json_collection_user_details(&col_user.read_only, &conn)
+        .to_json_collection_user_details(col_user.read_only, &conn)
     }).collect();
 
     Ok(Json(json!({
diff --git a/src/api/core/two_factor.rs b/src/api/core/two_factor.rs
index 875dec2..a6446fd 100644
--- a/src/api/core/two_factor.rs
+++ b/src/api/core/two_factor.rs
@@ -293,7 +293,7 @@ impl RegisterResponseCopy {
         RegisterResponse {
             registration_data: self.registration_data,
             version: self.version,
-            challenge: challenge,
+            challenge,
             client_data: self.client_data,
         }
     }
diff --git a/src/api/icons.rs b/src/api/icons.rs
index a436c8e..a29ede6 100644
--- a/src/api/icons.rs
+++ b/src/api/icons.rs
@@ -18,7 +18,7 @@ fn icon(domain: String) -> Content<Vec<u8>> {
     let icon_type = ContentType::new("image", "x-icon");
 
     // Validate the domain to avoid directory traversal attacks
-    if domain.contains("/") || domain.contains("..") {
+    if domain.contains('/') || domain.contains("..") {
         return Content(icon_type, get_fallback_icon());
     }
 
diff --git a/src/api/identity.rs b/src/api/identity.rs
index da27ff6..db62398 100644
--- a/src/api/identity.rs
+++ b/src/api/identity.rs
@@ -158,7 +158,7 @@ fn twofactor_auth(
     let providers: Vec<_> = twofactors.iter().map(|tf| tf.type_).collect();
 
     // No twofactor token if twofactor is disabled
-    if twofactors.len() == 0 {
+    if twofactors.is_empty() {
         return Ok(None);
     }
 
diff --git a/src/api/notifications.rs b/src/api/notifications.rs
index 0a0406e..377b59d 100644
--- a/src/api/notifications.rs
+++ b/src/api/notifications.rs
@@ -60,20 +60,20 @@ fn serialize(val: Value) -> Vec<u8> {
 
     // Add size bytes at the start
     // Extracted from BinaryMessageFormat.js
-    let mut size = buf.len();
+    let mut size: usize = buf.len();
     let mut len_buf: Vec<u8> = Vec::new();
 
     loop {
         let mut size_part = size & 0x7f;
-        size = size >> 7;
+        size >>= 7;
 
         if size > 0 {
-            size_part = size_part | 0x80;
+            size_part |= 0x80;
         }
 
         len_buf.push(size_part as u8);
 
-        if size <= 0 {
+        if size == 0 {
             break;
         }
     }
@@ -129,7 +129,7 @@ impl Handler for WSHandler {
     fn on_open(&mut self, hs: Handshake) -> ws::Result<()> {
         // TODO: Improve this split
         let path = hs.request.resource();
-        let mut query_split: Vec<_> = path.split("?").nth(1).unwrap().split("&").collect();
+        let mut query_split: Vec<_> = path.split('?').nth(1).unwrap().split('&').collect();
         query_split.sort();
         let access_token = &query_split[0][13..];
         let _id = &query_split[1][3..];
@@ -255,7 +255,7 @@ impl WebSocketUsers {
             vec![
                 ("UserId".into(), user.uuid.clone().into()),
                 ("Date".into(), serialize_date(user.updated_at)),
-            ].into(),
+            ],
             ut,
         );
 
@@ -268,7 +268,7 @@ impl WebSocketUsers {
                 ("Id".into(), folder.uuid.clone().into()),
                 ("UserId".into(), folder.user_uuid.clone().into()),
                 ("RevisionDate".into(), serialize_date(folder.updated_at)),
-            ].into(),
+            ],
             ut,
         );
 
@@ -286,7 +286,7 @@ impl WebSocketUsers {
                 ("OrganizationId".into(), org_uuid),
                 ("CollectionIds".into(), Value::Nil),
                 ("RevisionDate".into(), serialize_date(cipher.updated_at)),
-            ].into(),
+            ],
             ut,
         );
 
diff --git a/src/db/models/attachment.rs b/src/db/models/attachment.rs
index 9c8eeef..cfae5fb 100644
--- a/src/db/models/attachment.rs
+++ b/src/db/models/attachment.rs
@@ -78,7 +78,7 @@ impl Attachment {
                         println!("ERROR: Failed with 10 retries");
                         return Err(err)
                     } else {
-                        retries = retries - 1;
+                        retries -= 1;
                         println!("Had to retry! Retries left: {}", retries);
                         thread::sleep(time::Duration::from_millis(500));
                         continue
diff --git a/src/db/models/cipher.rs b/src/db/models/cipher.rs
index 2941db0..9039c52 100644
--- a/src/db/models/cipher.rs
+++ b/src/db/models/cipher.rs
@@ -362,6 +362,6 @@ impl Cipher {
             )
         ))
         .select(ciphers_collections::collection_uuid)
-        .load::<String>(&**conn).unwrap_or(vec![])
+        .load::<String>(&**conn).unwrap_or_default()
     }
 }
diff --git a/src/db/models/organization.rs b/src/db/models/organization.rs
index a2d9f5c..65b779b 100644
--- a/src/db/models/organization.rs
+++ b/src/db/models/organization.rs
@@ -194,7 +194,7 @@ impl UserOrganization {
         })
     }
 
-    pub fn to_json_collection_user_details(&self, read_only: &bool, conn: &DbConn) -> JsonValue {
+    pub fn to_json_collection_user_details(&self, read_only: bool, conn: &DbConn) -> JsonValue {
         let user = User::find_by_uuid(&self.user_uuid, conn).unwrap();
 
         json!({
@@ -281,14 +281,14 @@ impl UserOrganization {
         users_organizations::table
             .filter(users_organizations::user_uuid.eq(user_uuid))
             .filter(users_organizations::status.eq(UserOrgStatus::Confirmed as i32))
-            .load::<Self>(&**conn).unwrap_or(vec![])
+            .load::<Self>(&**conn).unwrap_or_default()
     }
 
     pub fn find_invited_by_user(user_uuid: &str, conn: &DbConn) -> Vec<Self> {
         users_organizations::table
             .filter(users_organizations::user_uuid.eq(user_uuid))
             .filter(users_organizations::status.eq(UserOrgStatus::Invited as i32))
-            .load::<Self>(&**conn).unwrap_or(vec![])
+            .load::<Self>(&**conn).unwrap_or_default()
     }
 
     pub fn find_by_org(org_uuid: &str, conn: &DbConn) -> Vec<Self> {
diff --git a/src/db/models/user.rs b/src/db/models/user.rs
index 0d958b5..71611e1 100644
--- a/src/db/models/user.rs
+++ b/src/db/models/user.rs
@@ -113,7 +113,7 @@ impl User {
         let orgs = UserOrganization::find_by_user(&self.uuid, conn);
         let orgs_json: Vec<JsonValue> = orgs.iter().map(|c| c.to_json(&conn)).collect();
 
-        let twofactor_enabled = TwoFactor::find_by_user(&self.uuid, conn).len() > 0;
+        let twofactor_enabled = !TwoFactor::find_by_user(&self.uuid, conn).is_empty();
 
         json!({
             "Id": self.uuid,