split: server foundation (Cargo, config, errors, utils, main)

Cargo.{toml,lock} bumps, build.rs, config-e2e.yml, rust-toolchain.toml,
src/config/* (database/logging/server/user configs), src/consts.rs,
src/errors.rs, src/main.rs, and src/utils/* (dedup_paths,
find_first_available_path, rotating_file_writer, sanitize_path).

sync-server/src/config/user_config.rs

@@ -1,6 +1,7 @@
 use bimap::BiHashMap;
 use rand::{Rng, distr::Alphanumeric, rng};
 use serde::{Deserialize, Deserializer, Serialize, de::Error};
+use subtle::ConstantTimeEq;
 
 use crate::app_state::database::models::VaultId;
 
@@ -19,10 +20,19 @@ where
     let mut user_token_map = BiHashMap::new();
     for user in &users {
         if let Some(existing_name) = user_token_map.get_by_right(&user.token) {
+            let redacted = if user.token.len() > 6 {
+                format!(
+                    "{}...{}",
+                    &user.token[..3],
+                    &user.token[user.token.len() - 3..]
+                )
+            } else {
+                "***".to_owned()
+            };
             return Err(D::Error::custom(format!(
-                "Duplicate user token found: `{}` for users `{}` and `{}`. User tokens must be \
-                unique.",
-                user.token, existing_name, user.name
+                "Duplicate user token found: `{redacted}` for users `{}` and `{}`. User tokens \
+                must be unique.",
+                existing_name, user.name
             )));
         }
 
@@ -41,7 +51,9 @@ where
 
 impl UserConfig {
     pub fn get_user(&self, token: &str) -> Option<&User> {
-        self.user_configs.iter().find(|u| u.token == token)
+        self.user_configs
+            .iter()
+            .find(|u| u.token.as_bytes().ct_eq(token.as_bytes()).into())
     }
 }