From 6022dd7cf725c3078f6491368198eda05c497034 Mon Sep 17 00:00:00 2001
From: Christine Dodrill <me@christine.website>
Date: Wed, 15 Apr 2020 22:08:05 -0400
Subject: [PATCH] auth0 example

---
 .envrc                                        |    1 +
 .gitignore                                    |    2 +
 Cargo.lock                                    | 2064 +++++++++++++++++
 Cargo.toml                                    |   25 +
 diesel.toml                                   |    5 +
 migrations/.gitkeep                           |    0
 .../down.sql                                  |    6 +
 .../up.sql                                    |   36 +
 .../2020-04-16-014530_add_users/down.sql      |    1 +
 migrations/2020-04-16-014530_add_users/up.sql |    7 +
 shell.nix                                     |   17 +
 src/auth.rs                                   |   30 +
 src/errors.rs                                 |   29 +
 src/handlers.rs                               |   92 +
 src/main.rs                                   |   66 +
 src/models.rs                                 |   21 +
 src/schema.rs                                 |    9 +
 17 files changed, 2411 insertions(+)
 create mode 100644 .envrc
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 diesel.toml
 create mode 100644 migrations/.gitkeep
 create mode 100644 migrations/00000000000000_diesel_initial_setup/down.sql
 create mode 100644 migrations/00000000000000_diesel_initial_setup/up.sql
 create mode 100644 migrations/2020-04-16-014530_add_users/down.sql
 create mode 100644 migrations/2020-04-16-014530_add_users/up.sql
 create mode 100644 shell.nix
 create mode 100644 src/auth.rs
 create mode 100644 src/errors.rs
 create mode 100644 src/handlers.rs
 create mode 100644 src/main.rs
 create mode 100644 src/models.rs
 create mode 100644 src/schema.rs

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..be81fed
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+eval "$(lorri direnv)"
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fedaa2b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+.env
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f138b95
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2064 @@
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+checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
+
+[[package]]
+name = "url"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
+dependencies = [
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
+name = "uuid"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fde2f6a4bea1d6e007c4ad38c6839fa71cbb63b6dbf5b595aa38dc9b1093c11"
+
+[[package]]
+name = "vcpkg"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fc439f2794e98976c88a2a2dafce96b930fe8010b0a256b3c2199a773933168"
+
+[[package]]
+name = "version_check"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
+
+[[package]]
+name = "want"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
+dependencies = [
+ "log",
+ "try-lock",
+]
+
+[[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 = "0.2.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2cc57ce05287f8376e998cbddfb4c8cb43b84a7ec55cf4551d7c00eef317a47f"
+dependencies = [
+ "cfg-if",
+ "serde",
+ "serde_json",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d967d37bf6c16cca2973ca3af071d0a2523392e4a594548155d89a678f4237cd"
+dependencies = [
+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7add542ea1ac7fdaa9dc25e031a6af33b7d63376292bd24140c637d00d1c312a"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bd151b63e1ea881bb742cd20e1d6127cef28399558f3b5d415289bc41eee3a4"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d68a5b36eef1be7868f668632863292e37739656a80fc4b9acec7b0bd35a4931"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf76fe7d25ac79748a37538b7daeed1c7a6867c92d3245c12c6222e4a20d639"
+
+[[package]]
+name = "web-sys"
+version = "0.3.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d6f51648d8c56c366144378a33290049eafdd784071077f6fe37dae64c1c4cb"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "widestring"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "effc0e4ff8085673ea7b9b2e3c73f6bd4d118810c9009ed8f1e16bd96c331db6"
+
+[[package]]
+name = "winapi"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+
+[[package]]
+name = "winapi"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa515c5163a99cc82bab70fd3bfdd36d827be85de63737b40fcef2ce084a436e"
+dependencies = [
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "winreg"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
+dependencies = [
+ "winapi 0.3.8",
+]
+
+[[package]]
+name = "ws2_32-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+dependencies = [
+ "winapi 0.2.8",
+ "winapi-build",
+]
+
+[[package]]
+name = "xatci"
+version = "0.1.0"
+dependencies = [
+ "actix-rt",
+ "actix-service",
+ "actix-web",
+ "actix-web-httpauth",
+ "alcoholic_jwt",
+ "anyhow",
+ "chrono",
+ "derive_more",
+ "diesel",
+ "futures",
+ "kankyo",
+ "log",
+ "pretty_env_logger",
+ "r2d2",
+ "reqwest",
+ "serde",
+ "serde_json",
+ "thiserror",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4293235
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "xatci"
+version = "0.1.0"
+authors = ["Christine Dodrill <me@christine.website>"]
+edition = "2018"
+
+[dependencies]
+actix-rt = "1"
+actix-service = "1"
+actix-web = "2"
+actix-web-httpauth = "0.4"
+alcoholic_jwt = "1"
+anyhow = "1.0"
+chrono = { version = "0.4", features = ["serde"] }
+derive_more = "0"
+diesel = { version = "1", features = ["postgres","uuidv07", "r2d2", "chrono"] }
+futures = "0.3"
+kankyo = "0.3"
+log = "0.4"
+pretty_env_logger = "0"
+r2d2 = "0.8"
+reqwest = { version = "0.10", features = ["json"] }
+serde_json = "1"
+serde = { version = "1", features = ["derive"] }
+thiserror = "1.0"
diff --git a/diesel.toml b/diesel.toml
new file mode 100644
index 0000000..92267c8
--- /dev/null
+++ b/diesel.toml
@@ -0,0 +1,5 @@
+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"
diff --git a/migrations/.gitkeep b/migrations/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/migrations/00000000000000_diesel_initial_setup/down.sql b/migrations/00000000000000_diesel_initial_setup/down.sql
new file mode 100644
index 0000000..a9f5260
--- /dev/null
+++ b/migrations/00000000000000_diesel_initial_setup/down.sql
@@ -0,0 +1,6 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();
diff --git a/migrations/00000000000000_diesel_initial_setup/up.sql b/migrations/00000000000000_diesel_initial_setup/up.sql
new file mode 100644
index 0000000..d68895b
--- /dev/null
+++ b/migrations/00000000000000_diesel_initial_setup/up.sql
@@ -0,0 +1,36 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
diff --git a/migrations/2020-04-16-014530_add_users/down.sql b/migrations/2020-04-16-014530_add_users/down.sql
new file mode 100644
index 0000000..cc1f647
--- /dev/null
+++ b/migrations/2020-04-16-014530_add_users/down.sql
@@ -0,0 +1 @@
+DROP TABLE users;
diff --git a/migrations/2020-04-16-014530_add_users/up.sql b/migrations/2020-04-16-014530_add_users/up.sql
new file mode 100644
index 0000000..83f8b4e
--- /dev/null
+++ b/migrations/2020-04-16-014530_add_users/up.sql
@@ -0,0 +1,7 @@
+CREATE TABLE users (
+  id SERIAL NOT NULL PRIMARY KEY,
+  first_name TEXT NOT NULL,
+  last_name TEXT NOT NULL,
+  email TEXT NOT NULL,
+  created_at TIMESTAMP NOT NULL
+);
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..97b6172
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,17 @@
+let pkgs = import <nixpkgs> { };
+in pkgs.mkShell {
+  buildInputs = with pkgs; [
+    rustc
+    cargo
+    rls
+    rustfmt
+    openssl
+    pkg-config
+    postgresql
+
+    diesel-cli
+  ];
+
+  DATABASE_URL = "postgres://xatci:hunter2@127.0.0.1/xatci?sslmode=disable";
+  DOMAIN = "https://xeserv.auth0.com/";
+}
diff --git a/src/auth.rs b/src/auth.rs
new file mode 100644
index 0000000..f7d4595
--- /dev/null
+++ b/src/auth.rs
@@ -0,0 +1,30 @@
+use crate::errors::ServiceError;
+use alcoholic_jwt::{token_kid, validate, Validation, JWKS};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Claims {
+    sub: String,
+    company: String,
+    exp: usize,
+}
+
+pub async fn validate_token(token: &str) -> Result<bool, ServiceError> {
+    let domain = std::env::var("DOMAIN").expect("DOMAIN must be set");
+    let jwks = fetch_jwks(&format!("{}{}", domain.as_str(), ".well-known/jwks.json")).await
+        .expect("failed to fetch jwks");
+    let validations = vec![Validation::Issuer(domain), Validation::SubjectPresent];
+    let kid = match token_kid(&token) {
+        Ok(res) => res.expect("failed to decode kid"),
+        Err(_) => return Err(ServiceError::JWKSFetchError),
+    };
+    let jwk = jwks.find(&kid).expect("Specified key not found in set");
+    let res = validate(token, jwk, validations);
+    Ok(res.is_ok())
+}
+
+async fn fetch_jwks(uri: &str) -> anyhow::Result<JWKS> {
+    let res = reqwest::get(uri).await?;
+    let val = res.json::<JWKS>().await?;
+    return Ok(val);
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..a17dd60
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,29 @@
+use actix_web::{error::ResponseError, HttpResponse};
+use derive_more::Display;
+
+#[derive(Debug, Display)]
+pub enum ServiceError {
+    #[display(fmt = "Internal Server Error")]
+    InternalServerError,
+
+    #[display(fmt = "BadRequest: {}", _0)]
+    BadRequest(String),
+
+    #[display(fmt = "JWKSFetchError")]
+    JWKSFetchError,
+}
+
+// impl ResponseError trait allows to convert our errors into http responses with appropriate data
+impl ResponseError for ServiceError {
+    fn error_response(&self) -> HttpResponse {
+        match self {
+            ServiceError::InternalServerError => {
+                HttpResponse::InternalServerError().json("Internal Server Error, Please try later")
+            }
+            ServiceError::BadRequest(ref message) => HttpResponse::BadRequest().json(message),
+            ServiceError::JWKSFetchError => {
+                HttpResponse::InternalServerError().json("Could not fetch JWKS")
+            }
+        }
+    }
+}
diff --git a/src/handlers.rs b/src/handlers.rs
new file mode 100644
index 0000000..7140675
--- /dev/null
+++ b/src/handlers.rs
@@ -0,0 +1,92 @@
+use super::models::{NewUser, User};
+use super::schema::users::dsl::*;
+use super::Pool;
+use crate::diesel::QueryDsl;
+use crate::diesel::RunQueryDsl;
+use actix_web::{web, Error, HttpResponse, Responder};
+use diesel::dsl::{delete, insert_into};
+use serde::{Deserialize, Serialize};
+use std::vec::Vec;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct InputUser {
+    pub first_name: String,
+    pub last_name: String,
+    pub email: String,
+}
+
+pub async fn get_users(db: web::Data<Pool>) -> Result<HttpResponse, Error> {
+    Ok(web::block(move || get_all_users(db))
+       .await
+       .map(|user| HttpResponse::Ok().json(user))
+       .map_err(|_| HttpResponse::InternalServerError())?)
+}
+
+fn get_all_users(pool: web::Data<Pool>) -> Result<Vec<User>, diesel::result::Error> {
+    let conn = pool.get().unwrap();
+    let items = users.load::<User>(&conn)?;
+    Ok(items)
+}
+
+// Handler for GET /users/{id}
+pub async fn get_user_by_id(
+    db: web::Data<Pool>,
+    user_id: web::Path<i32>,
+) -> Result<HttpResponse, Error> {
+    Ok(
+        web::block(move || db_get_user_by_id(db, user_id.into_inner()))
+            .await
+            .map(|user| HttpResponse::Ok().json(user))
+            .map_err(|_| HttpResponse::InternalServerError())?,
+    )
+}
+
+// Handler for POST /users
+pub async fn add_user(
+    db: web::Data<Pool>,
+    item: web::Json<InputUser>,
+) -> Result<HttpResponse, Error> {
+    Ok(web::block(move || add_single_user(db, item))
+        .await
+        .map(|user| HttpResponse::Created().json(user))
+        .map_err(|_| HttpResponse::InternalServerError())?)
+}
+
+// Handler for DELETE /users/{id}
+pub async fn delete_user(
+    db: web::Data<Pool>,
+    user_id: web::Path<i32>,
+) -> Result<HttpResponse, Error> {
+    Ok(
+        web::block(move || delete_single_user(db, user_id.into_inner()))
+            .await
+            .map(|user| HttpResponse::Ok().json(user))
+            .map_err(|_| HttpResponse::InternalServerError())?,
+    )
+}
+
+fn db_get_user_by_id(pool: web::Data<Pool>, user_id: i32) -> Result<User, diesel::result::Error> {
+    let conn = pool.get().unwrap();
+    users.find(user_id).get_result::<User>(&conn)
+}
+
+fn add_single_user(
+    db: web::Data<Pool>,
+    item: web::Json<InputUser>,
+) -> Result<User, diesel::result::Error> {
+    let conn = db.get().unwrap();
+    let new_user = NewUser {
+        first_name: &item.first_name,
+        last_name: &item.last_name,
+        email: &item.email,
+        created_at: chrono::Local::now().naive_local(),
+    };
+    let res = insert_into(users).values(&new_user).get_result(&conn)?;
+    Ok(res)
+}
+
+fn delete_single_user(db: web::Data<Pool>, user_id: i32) -> Result<usize, diesel::result::Error> {
+    let conn = db.get().unwrap();
+    let count = delete(users.find(user_id)).execute(&conn)?;
+    Ok(count)
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..78820bf
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,66 @@
+#[macro_use]
+extern crate diesel;
+
+use actix_web::{dev::ServiceRequest, web, App, Error, HttpServer};
+use actix_web_httpauth::{
+    extractors::{
+        bearer::{BearerAuth, Config},
+        AuthenticationError,
+    },
+    middleware::HttpAuthentication,
+};
+use diesel::prelude::*;
+use diesel::r2d2::{self, ConnectionManager};
+
+mod auth;
+mod errors;
+mod handlers;
+mod models;
+mod schema;
+
+pub type Pool = r2d2::Pool<ConnectionManager<PgConnection>>;
+
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
+    let _ = kankyo::init();
+    pretty_env_logger::init();
+    let database_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+    // create db connection pool
+    let manager = ConnectionManager::<PgConnection>::new(database_url);
+    let pool: Pool = r2d2::Pool::builder()
+        .build(manager)
+        .expect("Failed to create pool.");
+
+    // Start http server
+    HttpServer::new(move || {
+        let auth = HttpAuthentication::bearer(validator);
+        App::new()
+            .wrap(auth)
+            .data(pool.clone())
+            .route("/users", web::get().to(handlers::get_users))
+            .route("/users/{id}", web::get().to(handlers::get_user_by_id))
+            .route("/users", web::post().to(handlers::add_user))
+            .route("/users/{id}", web::delete().to(handlers::delete_user))
+    })
+    .bind("127.0.0.1:8080")?
+    .run()
+    .await
+}
+
+async fn validator(req: ServiceRequest, credentials: BearerAuth) -> Result<ServiceRequest, Error> {
+    let config = req
+        .app_data::<Config>()
+        .map(|data| data.get_ref().clone())
+        .unwrap_or_else(Default::default);
+    match auth::validate_token(credentials.token()).await {
+        Ok(res) => {
+            if res == true {
+                Ok(req)
+            } else {
+                Err(AuthenticationError::from(config).into())
+            }
+        }
+        Err(_) => Err(AuthenticationError::from(config).into()),
+    }
+}
diff --git a/src/models.rs b/src/models.rs
new file mode 100644
index 0000000..e57cb86
--- /dev/null
+++ b/src/models.rs
@@ -0,0 +1,21 @@
+use crate::schema::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize, Queryable)]
+pub struct User {
+    pub id: i32,
+    pub first_name: String,
+    pub last_name: String,
+    pub email: String,
+    pub created_at: chrono::NaiveDateTime,
+}
+
+#[derive(Insertable, Debug)]
+#[table_name = "users"]
+pub struct NewUser<'a> {
+    pub first_name: &'a str,
+    pub last_name: &'a str,
+    pub email: &'a str,
+    pub created_at: chrono::NaiveDateTime,
+}
+
diff --git a/src/schema.rs b/src/schema.rs
new file mode 100644
index 0000000..7486750
--- /dev/null
+++ b/src/schema.rs
@@ -0,0 +1,9 @@
+table! {
+    users (id) {
+        id -> Int4,
+        first_name -> Text,
+        last_name -> Text,
+        email -> Text,
+        created_at -> Timestamp,
+    }
+}