From 74aa1e3852159d995fa7b3f39ce9e43a3ec7484a Mon Sep 17 00:00:00 2001
From: supercmmetry <vishaals2000@gmail.com>
Date: Wed, 24 Jun 2020 13:55:28 +0530
Subject: [PATCH] utils: Implement error struct

- Implement Responder trait for Error
- Implement Responder trait for Success

Signed-off-by: supercmmetry <vishaals2000@gmail.com>
---
 Cargo.lock          | 834 +++++++++++++++++++++++++++++++++++++++++++-
 Cargo.toml          |   6 +
 src/main.rs         |  21 +-
 src/utils/errors.rs | 126 +++++++
 src/utils/mod.rs    |   1 +
 5 files changed, 972 insertions(+), 16 deletions(-)
 create mode 100644 src/utils/errors.rs
 create mode 100644 src/utils/mod.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4edc1a3..87003c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,81 @@
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@@ -322,12 +682,39 @@ version = "0.1.8"
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+ "quote 1.0.6",
+ "syn 1.0.27",
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@@ -409,6 +796,36 @@ dependencies = [
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@@ -419,6 +836,42 @@ dependencies = [
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@@ -441,12 +894,54 @@ dependencies = [
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+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ec3341498978de3bfd12d1b22f1af1de22818f5473a11e8a6ef997989e3a212"
+dependencies = [
+ "cfg-if",
+ "universal-hash",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
+
+[[package]]
+name = "pq-sys"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ac25eee5a0582f45a67e837e350d784e7003bd29a5f460796772061ca49ffda"
+dependencies = [
+ "vcpkg",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
@@ -483,6 +978,58 @@ dependencies = [
  "proc-macro2 1.0.17",
 ]
 
+[[package]]
+name = "r2d2"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1497e40855348e4a8a40767d8e55174bce1e445a3ac9254ad44ad468ee0485af"
+dependencies = [
+ "log 0.4.8",
+ "parking_lot",
+ "scheduled-thread-pool",
+]
+
+[[package]]
+name = "rand"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+dependencies = [
+ "getrandom",
+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
+dependencies = [
+ "rand_core",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.1.56"
@@ -490,15 +1037,47 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
 
 [[package]]
-name = "ring"
-version = "0.13.5"
+name = "redox_users"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c4db68a2e35f3497146b7e4563df7d4773a2433230c5e4b448328e31740458a"
+checksum = "09b23093265f8d200fa7b4c2c76297f47e681c655f6f1285a8780d6a022f7431"
+dependencies = [
+ "getrandom",
+ "redox_syscall",
+ "rust-argon2",
+]
+
+[[package]]
+name = "regex"
+version = "1.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+ "thread_local",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
+
+[[package]]
+name = "ring"
+version = "0.16.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "952cd6b98c85bbc30efa1ba5783b8abf12fec8b3287ffa52605b9432313e34e4"
 dependencies = [
  "cc",
- "lazy_static",
  "libc",
+ "once_cell",
+ "spin",
  "untrusted",
+ "web-sys",
+ "winapi 0.3.8",
 ]
 
 [[package]]
@@ -560,13 +1139,25 @@ dependencies = [
  "hyper",
  "indexmap",
  "pear",
- "percent-encoding",
+ "percent-encoding 1.0.1",
  "smallvec",
  "state",
  "time",
  "unicode-xid 0.1.0",
 ]
 
+[[package]]
+name = "rust-argon2"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017"
+dependencies = [
+ "base64 0.11.0",
+ "blake2b_simd",
+ "constant_time_eq",
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.4"
@@ -588,11 +1179,29 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "scheduled-thread-pool"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0988d7fdf88d5e5fcf5923a0f1e8ab345f3e98ab4bc6bc45a2d5ff7f7458fbf6"
+dependencies = [
+ "parking_lot",
+]
+
+[[package]]
+name = "scopeguard"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+
 [[package]]
 name = "serde"
 version = "1.0.110"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "99e7b308464d16b56eba9964e4972a3eee817760ab60d88c3f86e1fecb08204c"
+dependencies = [
+ "serde_derive",
+]
 
 [[package]]
 name = "serde_derive"
@@ -616,24 +1225,96 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a256f46ea78a0c0d9ff00077504903ac881a1dafdc20da66545699e7776b3e69"
+dependencies = [
+ "block-buffer",
+ "digest",
+ "fake-simd",
+ "opaque-debug",
+]
+
+[[package]]
+name = "simple_asn1"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b25ecba7165254f0c97d6c22a64b1122a03634b18d20a34daf21e18f892e618"
+dependencies = [
+ "chrono",
+ "num-bigint",
+ "num-traits",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 
+[[package]]
+name = "slog"
+version = "2.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cc9c640a4adbfbcc11ffb95efe5aa7af7309e002adab54b185507dbf2377b99"
+
+[[package]]
+name = "slog-async"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51b3336ce47ce2f96673499fc07eb85e3472727b9a7a2959964b002c2ce8fbbb"
+dependencies = [
+ "crossbeam-channel",
+ "slog",
+ "take_mut",
+ "thread_local",
+]
+
+[[package]]
+name = "slog-term"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bab1d807cf71129b05ce36914e1dbb6fbfbdecaf686301cb457f4fa967f9f5b6"
+dependencies = [
+ "atty",
+ "chrono",
+ "slog",
+ "term",
+ "thread_local",
+]
+
 [[package]]
 name = "smallvec"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c7cb5678e1615754284ec264d9bb5b4c27d2018577fd90ac0ceb578591ed5ee4"
 
+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+
 [[package]]
 name = "state"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7345c971d1ef21ffdbd103a75990a15eb03604fc8b8852ca8cb418ee1a099028"
 
+[[package]]
+name = "subtle"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
+
+[[package]]
+name = "subtle"
+version = "2.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "502d53007c02d7605a05df1c1a73ee436952781653da5d0bf57ad608f66932c1"
+
 [[package]]
 name = "syn"
 version = "0.15.44"
@@ -656,6 +1337,31 @@ dependencies = [
  "unicode-xid 0.2.0",
 ]
 
+[[package]]
+name = "take_mut"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
+
+[[package]]
+name = "term"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0863a3345e70f61d613eab32ee046ccd1bcc5f9105fe402c61fcd0c13eeb8b5"
+dependencies = [
+ "dirs",
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "time"
 version = "0.1.43"
@@ -687,6 +1393,12 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1410f6f91f21d1612654e7cc69193b0334f909dcf2c790c4826254fbb86f8887"
 
+[[package]]
+name = "typenum"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
+
 [[package]]
 name = "unicase"
 version = "1.4.2"
@@ -727,10 +1439,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
 
 [[package]]
-name = "untrusted"
-version = "0.6.2"
+name = "universal-hash"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55cd1f4b4e96b46aeb8d4855db4a7a9bd96eeeb5c6a1ab54593328761642ce2f"
+checksum = "df0c900f2f9b4116803415878ff48b63da9edb268668e08cf9292d7503114a01"
+dependencies = [
+ "generic-array",
+ "subtle 2.2.3",
+]
+
+[[package]]
+name = "untrusted"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
 [[package]]
 name = "url"
@@ -740,9 +1462,15 @@ checksum = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
 dependencies = [
  "idna",
  "matches",
- "percent-encoding",
+ "percent-encoding 1.0.1",
 ]
 
+[[package]]
+name = "vcpkg"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
+
 [[package]]
 name = "version_check"
 version = "0.1.5"
@@ -766,6 +1494,76 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c2dc4aa152834bc334f506c1a06b866416a8b6697d5c9f75b9a689c8486def0"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ded84f06e0ed21499f6184df0e0cb3494727b0c5da89534e0fcc55c51d812101"
+dependencies = [
+ "bumpalo",
+ "lazy_static",
+ "log 0.4.8",
+ "proc-macro2 1.0.17",
+ "quote 1.0.6",
+ "syn 1.0.27",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "838e423688dac18d73e31edce74ddfac468e37b1506ad163ffaf0a46f703ffe3"
+dependencies = [
+ "quote 1.0.6",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3156052d8ec77142051a533cdd686cba889537b213f948cd1d20869926e68e92"
+dependencies = [
+ "proc-macro2 1.0.17",
+ "quote 1.0.6",
+ "syn 1.0.27",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9ba19973a58daf4db6f352eda73dc0e289493cd29fb2632eb172085b6521acd"
+
+[[package]]
+name = "web-sys"
+version = "0.3.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b72fe77fd39e4bd3eaa4412fd299a0be6b3dfe9d2597e2f1c20beb968f41d17"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -830,3 +1628,9 @@ name = "yansi"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fc79f4a1e39857fc00c3f662cbf2651c771f00e9c15fe2abc341806bd46bd71"
+
+[[package]]
+name = "zeroize"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
diff --git a/Cargo.toml b/Cargo.toml
index a8a34e2..131d092 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,4 +12,10 @@ rocket_contrib = {version="0.4.4", default-features=false, features=["json"]}
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
+diesel = {version = "1.4.4", features = ["postgres", "r2d2", "chrono"]}
+diesel_migrations = "1.4.0"
 dotenv = "0.15.0"
+jsonwebtoken = "7.1.2"
+slog = "2.5.2"
+slog-term = "2.6.0"
+slog-async = "2.5.0"
diff --git a/src/main.rs b/src/main.rs
index 433f3aa..fdec5ee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,16 +2,35 @@
 
 #[macro_use]
 extern crate rocket;
+#[macro_use]
+extern crate rocket_contrib;
+#[macro_use]
+extern crate diesel;
+#[macro_use]
+extern crate serde;
+#[macro_use]
+extern crate slog;
 
 pub mod api;
 pub mod core;
+pub mod utils;
 
+use slog_term;
+use slog_async;
+use slog::Drain;
 
 
 fn main() {
+    let decorator = slog_term::TermDecorator::new().build();
+    let drain = slog_term::FullFormat::new(decorator).build().fuse();
+    let drain = slog_async::Async::new(drain).build().fuse();
+
+    let logger = slog::Logger::root(drain, o!());
+
     let mut rocket = rocket::ignite();
 
     rocket = api::routes::fuel(rocket);
 
-    rocket.launch();
+    rocket.manage(logger)
+    .launch();
 }
diff --git a/src/utils/errors.rs b/src/utils/errors.rs
new file mode 100644
index 0000000..e8c17bf
--- /dev/null
+++ b/src/utils/errors.rs
@@ -0,0 +1,126 @@
+use rocket::{http::{Status, ContentType}, response::Responder, Request, response, Response, Outcome, State};
+
+use std::io::Cursor;
+use slog::Logger;
+use slog;
+
+#[derive(Debug, Serialize, Clone)]
+pub enum ErrorCode {
+    InvalidCredentials,
+    MultipleAuthToken,
+    NoAuthToken,
+    AuthTokenCreationFailed,
+    MalformedAuthToken,
+    ResourceNotFound,
+    ResourceAlreadyExists,
+    DatabaseError,
+    InvalidData,
+    NotAuthorized,
+    CorruptResource,
+    LogicalConflict,
+    Unknown,
+}
+
+#[derive(Debug, Serialize, Clone)]
+pub struct Error {
+    code: ErrorCode,
+    msg: String,
+}
+
+impl Error {
+    pub fn new(code: ErrorCode) -> Error {
+        Error {
+            code,
+            msg: "".to_string(),
+        }.set_msg()
+    }
+
+    pub fn custom(code: ErrorCode, msg: String) -> Error {
+        Error {
+            code,
+            msg,
+        }
+    }
+
+    fn get_status_code(&self) -> Status {
+        match self.code {
+            ErrorCode::InvalidCredentials => Status::Forbidden,
+            ErrorCode::ResourceNotFound => Status::NotFound,
+            ErrorCode::MultipleAuthToken => Status::Conflict,
+            ErrorCode::NoAuthToken => Status::Forbidden,
+            ErrorCode::AuthTokenCreationFailed => Status::InternalServerError,
+            ErrorCode::MalformedAuthToken => Status::Forbidden,
+            ErrorCode::ResourceAlreadyExists => Status::Conflict,
+            ErrorCode::DatabaseError => Status::InternalServerError,
+            ErrorCode::InvalidData => Status::BadRequest,
+            ErrorCode::NotAuthorized => Status::Forbidden,
+            ErrorCode::CorruptResource => Status::InternalServerError,
+            ErrorCode::LogicalConflict => Status::BadRequest,
+            ErrorCode::Unknown => Status::InternalServerError
+        }
+    }
+
+    fn set_msg(mut self) -> Self {
+        self.msg = match self.code.clone() {
+            ErrorCode::InvalidCredentials => "invalid credentials were provided".to_string(),
+            ErrorCode::MultipleAuthToken => "multiple authorization tokens were provided".to_string(),
+            ErrorCode::NoAuthToken => "no authorization token was found".to_string(),
+            ErrorCode::AuthTokenCreationFailed => "authorization token creation failed".to_string(),
+            ErrorCode::MalformedAuthToken => "authorization token was malformed".to_string(),
+            ErrorCode::ResourceNotFound => "resource not found".to_string(),
+            ErrorCode::ResourceAlreadyExists => "the given resource already exists".to_string(),
+            ErrorCode::DatabaseError => "database error occured".to_string(),
+            ErrorCode::InvalidData => "invalid data provided".to_string(),
+            ErrorCode::NotAuthorized => "you are not authorized to perform the requested operation".to_string(),
+            ErrorCode::CorruptResource => "requested resource was corrupted".to_string(),
+            ErrorCode::LogicalConflict => "the request logically conflicts with the existing data".to_string(),
+            ErrorCode::Unknown => "unknown error occured".to_string()
+        };
+        self
+    }
+}
+
+impl<'r> Responder<'r> for Error {
+    fn respond_to(self, request: &Request) -> response::Result<'r> {
+        let logger = request.guard::<State<Logger>>();
+
+        if let Outcome::Success(logger) = logger {
+            error!(logger, "{}", serde_json::to_string(&self).unwrap());
+        }
+
+        Response::build()
+            .status(self.get_status_code())
+            .header(ContentType::JSON)
+            .sized_body(Cursor::new(serde_json::to_string(&self).unwrap()))
+            .ok()
+    }
+}
+
+#[derive(Serialize)]
+pub struct Success {
+    msg: String
+}
+
+impl Success {
+    pub fn new(msg: &str) -> Success {
+        Success {
+            msg: msg.to_string()
+        }
+    }
+}
+
+impl<'r> Responder<'r> for Success {
+    fn respond_to(self, request: &Request) -> response::Result<'r> {
+        let logger = request.guard::<State<Logger>>();
+
+        if let Outcome::Success(logger) = logger {
+            info!(logger, "{}", serde_json::to_string(&self).unwrap());
+        }
+
+        Response::build()
+            .status(Status::Ok)
+            .header(ContentType::JSON)
+            .sized_body(Cursor::new(serde_json::to_string(&self).unwrap()))
+            .ok()
+    }
+}
\ No newline at end of file
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
new file mode 100644
index 0000000..18e02b2
--- /dev/null
+++ b/src/utils/mod.rs
@@ -0,0 +1 @@
+pub mod errors;
\ No newline at end of file