From 1019ea1ed341e3a7769c046aa0be5764789360b6 Mon Sep 17 00:00:00 2001
From: Joris
Date: Sun, 2 Jun 2024 14:38:13 +0200
Subject: Migrate to Rust and Hyper

With sanic, downloading a file locally is around ten times slower than
with Rust and hyper.

Maybe `pypy` could have helped, but I didn’t succeed to set it up
quickly with the dependencies.
---
 .gitignore          |    4 +-
 Cargo.lock          | 1306 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml          |   23 +
 bin/dev-server      |   16 +-
 flake.lock          |   63 ++-
 flake.nix           |   51 +-
 init-db.sql         |    4 +-
 src/controller.py   |   58 ---
 src/db.py           |   24 -
 src/db.rs           |  125 +++++
 src/main-old.py     |   33 --
 src/main.py         |   28 --
 src/main.rs         |   68 +++
 src/model.rs        |   52 ++
 src/routes.rs       |  209 +++++++++
 src/server.py       |   84 ----
 src/static/main.css |   94 ++++
 src/static/main.js  |   49 ++
 src/templates.py    |  105 -----
 src/templates.rs    |  134 ++++++
 src/util.rs         |  125 +++++
 src/utils.py        |    8 -
 static/main.css     |   71 ---
 static/main.js      |   48 --
 24 files changed, 2288 insertions(+), 494 deletions(-)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 delete mode 100644 src/controller.py
 delete mode 100644 src/db.py
 create mode 100644 src/db.rs
 delete mode 100644 src/main-old.py
 delete mode 100644 src/main.py
 create mode 100644 src/main.rs
 create mode 100644 src/model.rs
 create mode 100644 src/routes.rs
 delete mode 100644 src/server.py
 create mode 100644 src/static/main.css
 create mode 100644 src/static/main.js
 delete mode 100644 src/templates.py
 create mode 100644 src/templates.rs
 create mode 100644 src/util.rs
 delete mode 100644 src/utils.py
 delete mode 100644 static/main.css
 delete mode 100644 static/main.js

diff --git a/.gitignore b/.gitignore
index de6d4e7..19dbd02 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-__pycache__
-files
+target/
+files/
 db.sqlite3
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..208a59b
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1306 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
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+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
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+name = "adler"
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+
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+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
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+ "memchr",
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+
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+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets 0.52.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.5",
+ "windows_aarch64_msvc 0.52.5",
+ "windows_i686_gnu 0.52.5",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.5",
+ "windows_x86_64_gnu 0.52.5",
+ "windows_x86_64_gnullvm 0.52.5",
+ "windows_x86_64_msvc 0.52.5",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0c69f2c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "files"
+version = "0.1.0"
+authors = ["Joris <joris@guyonvarch.me>"]
+edition = "2021"
+
+[dependencies]
+base64 = "0.22"
+chrono = "0.4"
+const_format = "0.2"
+env_logger = "0.11"
+futures-util = "0.3"
+html-escape = "0.2"
+http-body-util = "0.1"
+hyper = { version = "1", features = ["full"] }
+hyper-util = { version = "0.1", features = ["full"] }
+log = "0.4"
+rand = { version = "0.8", features = ["getrandom"] }
+rand_core = "0.6.0"
+tempfile = "3.10"
+tokio = { version = "1", features = ["full"] }
+tokio-rusqlite = "0.5.1"
+tokio-util = "0.7"
diff --git a/bin/dev-server b/bin/dev-server
index d489127..cb124df 100755
--- a/bin/dev-server
+++ b/bin/dev-server
@@ -3,14 +3,20 @@ set -euo pipefail
 
 if ! [ -f db.sqlite3 ]; then
 
-  echo "Creating databise"
+  echo "Creating database"
   sqlite3 db.sqlite3 < init-db.sql
   sleep 1
 
 fi
 
+export HOST="127.0.0.1"
+export PORT="8080"
+export KEY="1234"
+export DB="db.sqlite3"
+export FILES_DIR="files"
+
 watchexec \
-  --restart \
-  --clear \
-  --exts py \
-  python src/main.py
+    --clear \
+    --restart \
+    -w src \
+    "RUST_LOG=info cargo run"
diff --git a/flake.lock b/flake.lock
index ea71eaf..7ab693c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -18,13 +18,31 @@
         "type": "github"
       }
     },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1716040799,
-        "narHash": "sha256-0U19tjIaggl2b+v1ozMj7yVMCoWb1MOcV8dzTuyEZB8=",
+        "lastModified": 1716641285,
+        "narHash": "sha256-kwSMlUXL1sayqznVuL0OCF46h9a/cg7ESko0ISEVGUo=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "cb7884d6de31c46736adb561533527238fe7d3c9",
+        "rev": "a44514a1227ee12947a55a569c24da3aedaf5e85",
         "type": "github"
       },
       "original": {
@@ -36,7 +54,29 @@
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1716603336,
+        "narHash": "sha256-81u/zd7V+XRTq88zwRLxw5GnwZyEiAvGA2BvAXUe864=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4d0f1e4d5d65c23cdbb77e4b0d91940be7309bd4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     },
     "systems": {
@@ -53,6 +93,21 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 170fe8d..fe059df 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,28 +1,35 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs";
-    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url      = "github:nixos/nixpkgs";
+    flake-utils.url  = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem
-      (system:
-        let pkgs = nixpkgs.legacyPackages.${system};
-        in { devShell = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            (pkgs.python3.withPackages (pythonPackages: with pythonPackages; [
-              sqlite
-              watchexec
-              sanic
-              setuptools
-            ]))
+  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+      in
+      with pkgs;
+      {
+        devShell = mkShell {
+          buildInputs = [
+            cargo-watch
+            lld
+            openssl
+            pkg-config
+            rust-bin.stable."1.78.0".default
+            sqlite
+            watchexec
           ];
-          shellHook = ''
-            export DEBUG="TRUE"
-            export HOST="127.0.0.1"
-            export PORT="8080"
-            export KEY="1234"
-          '';
-        }; }
-      );
+        };
+      }
+    );
 }
+
diff --git a/init-db.sql b/init-db.sql
index 57afd00..bbfe6c7 100644
--- a/init-db.sql
+++ b/init-db.sql
@@ -1,7 +1,7 @@
 CREATE TABLE files(
     id TEXT PRIMARY KEY,
+    created_at STRING NOT NULL,
+    expires_at STRING NOT NULL,
     filename TEXT NOT NULL,
-    created TEXT NOT NULL,
-    expires TEXT NOT NULL,
     content_length INTEGER NOT NULL
 )
diff --git a/src/controller.py b/src/controller.py
deleted file mode 100644
index 351d0bc..0000000
--- a/src/controller.py
+++ /dev/null
@@ -1,58 +0,0 @@
-import io
-import logging
-import os
-import sanic
-import sqlite3
-import tempfile
-
-import db
-import templates
-import utils
-
-conn = sqlite3.connect('db.sqlite3')
-files_directory = 'files'
-authorized_key = os.environ['KEY']
-
-def index():
-    return sanic.html(templates.index)
-
-async def upload(request):
-    key = request.headers.get('X-Key')
-    if not key == authorized_key:
-        sanic.log.logging.info('Unauthorized to upload file: wrong key')
-        return sanic.text('Unauthorized', status = 401)
-    else:
-        sanic.log.logging.info('Uploading file')
-        content_length = int(request.headers.get('content-length'))
-        filename = utils.sanitize_filename(request.headers.get('X-FileName'))
-        expiration = request.headers.get('X-Expiration')
-
-        with tempfile.NamedTemporaryFile(delete = False) as tmp:
-            while data := await request.stream.read():
-                tmp.write(data)
-
-        sanic.log.logging.info('File uploaded')
-        file_id = db.insert_file(conn, filename, expiration, content_length)
-        os.makedirs(files_directory, exist_ok=True)
-        os.rename(tmp.name, os.path.join(files_directory, file_id))
-
-        return sanic.text(file_id)
-
-async def file(file_id: str, download: bool):
-    res = db.get_file(conn, file_id)
-    if res is None:
-        self._serve_str(templates.not_found, 404, 'text/html')
-    else:
-        filename, expires, content_length = res
-        disk_path = os.path.join(files_directory, file_id)
-        if download:
-            return await sanic.response.file_stream(
-                disk_path,
-                chunk_size = io.DEFAULT_BUFFER_SIZE,
-                headers = {
-                    'Content-Disposition': f'attachment; filename={filename}',
-                    'Content-Length': content_length
-                }
-            )
-        else:
-            return sanic.html(templates.file_page(file_id, filename, expires))
diff --git a/src/db.py b/src/db.py
deleted file mode 100644
index a6e29fd..0000000
--- a/src/db.py
+++ /dev/null
@@ -1,24 +0,0 @@
-import secrets
-
-def insert_file(conn, filename: str, expiration_days: int, content_length: int):
-    cur = conn.cursor()
-    file_id = secrets.token_urlsafe()
-    cur.execute(
-        'INSERT INTO files(id, filename, created, expires, content_length) VALUES(?, ?, datetime(), datetime(datetime(), ?), ?)',
-        (file_id, filename, f'+{expiration_days} days', content_length)
-    )
-    conn.commit()
-    return file_id
-
-def get_file(conn, file_id: str):
-    cur = conn.cursor()
-    res = cur.execute(
-        '''
-            SELECT filename, expires, content_length
-            FROM files
-            WHERE id = ? AND expires > datetime()
-        ''',
-        (file_id,)
-    )
-    return res.fetchone()
-
diff --git a/src/db.rs b/src/db.rs
new file mode 100644
index 0000000..e1bb7e3
--- /dev/null
+++ b/src/db.rs
@@ -0,0 +1,125 @@
+use tokio_rusqlite::{params, Connection, Result};
+
+use crate::model::{decode_datetime, encode_datetime, File};
+
+pub async fn insert_file(conn: &Connection, file: File) -> Result<()> {
+    conn.call(move |conn| {
+        conn.execute(
+            r#"
+                INSERT INTO
+                    files(id, created_at, expires_at, filename, content_length)
+                VALUES
+                    (?1, datetime(), ?2, ?3, ?4)
+                "#,
+            params![
+                file.id,
+                encode_datetime(file.expires_at),
+                file.name,
+                file.content_length
+            ],
+        )
+        .map_err(tokio_rusqlite::Error::Rusqlite)
+    })
+    .await
+    .map(|_| ())
+}
+
+pub async fn get_file(conn: &Connection, file_id: String) -> Result<Option<File>> {
+    conn.call(move |conn| {
+        let mut stmt = conn.prepare(
+            r#"
+            SELECT
+                filename, expires_at, content_length
+            FROM
+                files
+            WHERE
+                id = ?
+                AND expires_at > datetime()
+            "#,
+        )?;
+
+        let mut iter = stmt.query_map([file_id.clone()], |row| {
+            let res: (String, String, usize) = (row.get(0)?, row.get(1)?, row.get(2)?);
+            Ok(res)
+        })?;
+
+        match iter.next() {
+            Some(Ok((filename, expires_at, content_length))) => {
+                match decode_datetime(&expires_at) {
+                    Some(expires_at) => Ok(Some(File {
+                        id: file_id.clone(),
+                        name: filename,
+                        expires_at,
+                        content_length,
+                    })),
+                    _ => Err(rusqlite_other_error(&format!(
+                        "Error decoding datetime: {expires_at}"
+                    ))),
+                }
+            }
+            Some(_) => Err(rusqlite_other_error("Error reading file in DB")),
+            None => Ok(None),
+        }
+    })
+    .await
+}
+
+fn rusqlite_other_error(msg: &str) -> tokio_rusqlite::Error {
+    tokio_rusqlite::Error::Other(msg.into())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::model::local_time;
+    use chrono::Duration;
+    use std::ops::Add;
+
+    #[tokio::test]
+    async fn test_insert_and_get_file() {
+        let conn = get_connection().await;
+        let file = dummy_file(Duration::minutes(1));
+        assert!(insert_file(&conn, file.clone()).await.is_ok());
+        let file_res = get_file(&conn, file.id.clone()).await;
+        assert!(file_res.is_ok());
+        assert_eq!(file_res.unwrap(), Some(file));
+    }
+
+    #[tokio::test]
+    async fn test_expired_file_err() {
+        let conn = get_connection().await;
+        let file = dummy_file(Duration::zero());
+        assert!(insert_file(&conn, file.clone()).await.is_ok());
+        let file_res = get_file(&conn, file.id.clone()).await;
+        assert!(file_res.is_ok());
+        assert!(file_res.unwrap().is_none());
+    }
+
+    #[tokio::test]
+    async fn test_wrong_file_err() {
+        let conn = get_connection().await;
+        let file = dummy_file(Duration::minutes(1));
+        assert!(insert_file(&conn, file.clone()).await.is_ok());
+        let file_res = get_file(&conn, "wrong-id".to_string()).await;
+        assert!(file_res.is_ok());
+        assert!(file_res.unwrap().is_none());
+    }
+
+    fn dummy_file(td: Duration) -> File {
+        File {
+            id: "1234".to_string(),
+            name: "foo".to_string(),
+            expires_at: local_time().add(td),
+            content_length: 100,
+        }
+    }
+
+    async fn get_connection() -> Connection {
+        let conn = Connection::open_in_memory().await.unwrap();
+        let init_db = tokio::fs::read_to_string("init-db.sql").await.unwrap();
+
+        let res = conn.call(move |conn| Ok(conn.execute(&init_db, []))).await;
+        assert!(res.is_ok());
+        conn
+    }
+}
diff --git a/src/main-old.py b/src/main-old.py
deleted file mode 100644
index 42d7c8c..0000000
--- a/src/main-old.py
+++ /dev/null
@@ -1,33 +0,0 @@
-# import http.server
-# import logging
-# import os
-# import sys
-
-# import server
-
-# logger = logging.getLogger(__name__)
-# hostName = os.environ['HOST']
-# serverPort = int(os.environ['PORT'])
-
-# if __name__ == '__main__':
-#     logging.basicConfig(stream=sys.stdout, level=logging.INFO)
-#     webServer = http.server.HTTPServer((hostName, serverPort), server.MyServer)
-#     logger.info('Server started at http://%s:%s.' % (hostName, serverPort))
-
-#     try:
-#         webServer.serve_forever()
-#     except KeyboardInterrupt:
-#         pass
-
-#     webServer.server_close()
-#     conn.close()
-#     logger.info('Server stopped.')
-
-from sanic import Sanic
-from sanic.response import text
-
-app = Sanic("MyHelloWorldApp")
-
-@app.get("/")
-async def hello_world(request):
-    return text("Hello, world.")
diff --git a/src/main.py b/src/main.py
deleted file mode 100644
index b678aae..0000000
--- a/src/main.py
+++ /dev/null
@@ -1,28 +0,0 @@
-import sanic
-import os
-
-import controller
-
-app = sanic.Sanic("Files")
-
-@app.get("/")
-async def index(request):
-    return controller.index()
-
-@app.post("/", stream = True)
-async def upload(request):
-    return await controller.upload(request)
-
-@app.get("/<file_id:str>")
-async def file_page(request, file_id):
-    return await controller.file(file_id, download = False)
-
-@app.get("/<file_id:str>/download")
-async def file_download(request, file_id):
-    return await controller.file(file_id, download = True)
-
-app.static("/static/", "static/")
-
-if __name__ == "__main__":
-    debug = 'DEBUG' in os.environ and os.environ['DEBUG'] == 'TRUE'
-    app.run(debug=debug, access_log=True)
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..27da278
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,68 @@
+use std::env;
+use std::net::SocketAddr;
+
+use hyper::server::conn::http1;
+use hyper::service::service_fn;
+use hyper_util::rt::TokioIo;
+use tokio::net::TcpListener;
+use tokio_rusqlite::Connection;
+
+mod db;
+mod model;
+mod routes;
+mod templates;
+mod util;
+
+#[tokio::main]
+async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
+    env_logger::init();
+
+    let host = get_env("HOST");
+    let port = get_env("PORT");
+    let db_path = get_env("DB");
+    let authorized_key = get_env("KEY");
+    let files_dir = get_env("FILES_DIR");
+
+    let db_conn = Connection::open(db_path)
+        .await
+        .expect("Error while openning DB conection");
+
+    let addr: SocketAddr = format!("{host}:{port}")
+        .parse()
+        .unwrap_or_else(|_| panic!("Invalid address: {host}:{port}"));
+
+    let listener = TcpListener::bind(addr).await?;
+    log::info!("Listening on http://{}", addr);
+
+    loop {
+        let (stream, _) = listener.accept().await?;
+        let io = TokioIo::new(stream);
+
+        let db_conn = db_conn.clone();
+        let authorized_key = authorized_key.clone();
+        let files_dir = files_dir.clone();
+
+        tokio::task::spawn(async move {
+            if let Err(err) = http1::Builder::new()
+                .serve_connection(
+                    io,
+                    service_fn(move |req| {
+                        routes::routes(
+                            req,
+                            db_conn.clone(),
+                            authorized_key.clone(),
+                            files_dir.clone(),
+                        )
+                    }),
+                )
+                .await
+            {
+                log::error!("Failed to serve connection: {:?}", err);
+            }
+        });
+    }
+}
+
+fn get_env(key: &str) -> String {
+    env::var(key).unwrap_or_else(|_| panic!("Missing environment variable {key}"))
+}
diff --git a/src/model.rs b/src/model.rs
new file mode 100644
index 0000000..ed4fbf8
--- /dev/null
+++ b/src/model.rs
@@ -0,0 +1,52 @@
+use base64::{engine::general_purpose::URL_SAFE, Engine as _};
+use chrono::{DateTime, Local, NaiveDateTime, TimeZone};
+use rand_core::{OsRng, RngCore};
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct File {
+    pub id: String,
+    pub name: String,
+    pub expires_at: DateTime<Local>,
+    pub content_length: usize,
+}
+
+pub fn local_time() -> DateTime<Local> {
+    let dt = Local::now();
+    match decode_datetime(&encode_datetime(dt)) {
+        Some(res) => res,
+        None => dt,
+    }
+}
+
+// Using 20 bytes (160 bits) to file identifiers
+// https://owasp.org/www-community/vulnerabilities/Insufficient_Session-ID_Length
+// https://www.rfc-editor.org/rfc/rfc6749.html#section-10.10
+const FILE_ID_BYTES: usize = 20;
+
+pub fn generate_file_id() -> String {
+    let mut token = [0u8; FILE_ID_BYTES];
+    OsRng.fill_bytes(&mut token);
+    URL_SAFE.encode(token)
+}
+
+const FORMAT: &str = "%Y-%m-%d %H:%M:%S";
+
+pub fn encode_datetime(dt: DateTime<Local>) -> String {
+    dt.naive_utc().format(FORMAT).to_string()
+}
+
+pub fn decode_datetime(str: &str) -> Option<DateTime<Local>> {
+    let naive_time = NaiveDateTime::parse_from_str(str, FORMAT).ok()?;
+    Some(Local.from_utc_datetime(&naive_time))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_datetime_serialization() {
+        let dt = local_time();
+        assert_eq!(decode_datetime(&encode_datetime(dt)), Some(dt))
+    }
+}
diff --git a/src/routes.rs b/src/routes.rs
new file mode 100644
index 0000000..b54e565
--- /dev/null
+++ b/src/routes.rs
@@ -0,0 +1,209 @@
+use std::ops::Add;
+use std::path::{Path, PathBuf};
+
+use chrono::Duration;
+use futures_util::TryStreamExt;
+use http_body_util::{combinators::BoxBody, BodyExt, Full, StreamBody};
+use hyper::body::{Bytes, Frame, Incoming};
+use hyper::header::{HeaderName, HeaderValue, CONTENT_DISPOSITION, CONTENT_LENGTH, CONTENT_TYPE};
+use hyper::{Method, Request, Response, Result, StatusCode};
+use tokio::io::AsyncWriteExt;
+use tokio::{fs, fs::File};
+use tokio_rusqlite::Connection;
+use tokio_util::io::ReaderStream;
+
+use crate::db;
+use crate::model;
+use crate::templates;
+use crate::util;
+
+pub async fn routes(
+    request: Request<Incoming>,
+    db_conn: Connection,
+    authorized_key: String,
+    files_dir: String,
+) -> Result<Response<BoxBody<Bytes, std::io::Error>>> {
+    let path = &request.uri().path().split('/').collect::<Vec<&str>>()[1..];
+    let files_dir = Path::new(&files_dir);
+
+    match (request.method(), path) {
+        (&Method::GET, [""]) => Ok(response(StatusCode::OK, templates::INDEX.to_string())),
+        (&Method::GET, ["static", "main.js"]) => Ok(static_file(
+            include_str!("static/main.js").to_string(),
+            "application/javascript",
+        )),
+        (&Method::GET, ["static", "main.css"]) => Ok(static_file(
+            include_str!("static/main.css").to_string(),
+            "text/css",
+        )),
+        (&Method::POST, [""]) => upload_file(request, db_conn, authorized_key, files_dir).await,
+        (&Method::GET, [file_id]) => get(db_conn, file_id, GetFile::ShowPage, files_dir).await,
+        (&Method::GET, [file_id, "download"]) => {
+            get(db_conn, file_id, GetFile::Download, files_dir).await
+        }
+        _ => Ok(not_found()),
+    }
+}
+
+async fn upload_file(
+    request: Request<Incoming>,
+    db_conn: Connection,
+    authorized_key: String,
+    files_dir: &Path,
+) -> Result<Response<BoxBody<Bytes, std::io::Error>>> {
+    let key = get_header(&request, "X-Key");
+    if key != Some(authorized_key) {
+        log::info!("Unauthorized file upload");
+        Ok(response(
+            StatusCode::UNAUTHORIZED,
+            "Unauthorized".to_string(),
+        ))
+    } else {
+        let file_id = model::generate_file_id();
+        let filename = get_header(&request, "X-Filename").map(|s| util::sanitize_filename(&s));
+        let expiration_days: Option<i64> =
+            get_header(&request, "X-Expiration").and_then(|s| s.parse().ok());
+        let content_length: Option<usize> =
+            get_header(&request, "Content-Length").and_then(|s| s.parse().ok());
+
+        match (filename, expiration_days, content_length) {
+            (Some(filename), Some(expiration_days), Some(content_length)) => {
+                let _ = fs::create_dir(files_dir).await;
+                let path = files_dir.join(&file_id);
+                let mut file = File::create(&path).await.unwrap();
+
+                let mut incoming = request.into_body();
+                while let Some(frame) = incoming.frame().await {
+                    if let Ok(data) = frame {
+                        let _ = file.write_all(&data.into_data().unwrap()).await;
+                        let _ = file.flush().await;
+                    }
+                }
+
+                let file = model::File {
+                    id: file_id.clone(),
+                    name: filename,
+                    expires_at: model::local_time().add(Duration::days(expiration_days)),
+                    content_length,
+                };
+
+                match db::insert_file(&db_conn, file.clone()).await {
+                    Ok(_) => Ok(response(StatusCode::OK, file_id)),
+                    Err(msg) => {
+                        log::error!("Insert file: {msg}");
+                        if let Err(msg) = fs::remove_file(path).await {
+                            log::error!("Remove file: {msg}");
+                        };
+                        Ok(internal_server_error())
+                    }
+                }
+            }
+            _ => Ok(bad_request()),
+        }
+    }
+}
+
+fn get_header(request: &Request<Incoming>, header: &str) -> Option<String> {
+    request
+        .headers()
+        .get(header)?
+        .to_str()
+        .ok()
+        .map(|str| str.to_string())
+}
+
+enum GetFile {
+    ShowPage,
+    Download,
+}
+
+async fn get(
+    db_conn: Connection,
+    file_id: &str,
+    get_file: GetFile,
+    files_dir: &Path,
+) -> Result<Response<BoxBody<Bytes, std::io::Error>>> {
+    let file = db::get_file(&db_conn, file_id.to_string()).await;
+    match (get_file, file) {
+        (GetFile::ShowPage, Ok(Some(file))) => {
+            Ok(response(StatusCode::OK, templates::file_page(file)))
+        }
+        (GetFile::Download, Ok(Some(file))) => {
+            let path = files_dir.join(file_id);
+            Ok(stream_file(path, file).await)
+        }
+        (_, Err(msg)) => {
+            log::error!("Getting file: {msg}");
+            Ok(internal_server_error())
+        }
+        (_, Ok(None)) => Ok(not_found()),
+    }
+}
+
+fn static_file(text: String, content_type: &str) -> Response<BoxBody<Bytes, std::io::Error>> {
+    let response = Response::builder()
+        .body(Full::new(text.into()).map_err(|e| match e {}).boxed())
+        .unwrap();
+    with_headers(response, vec![(CONTENT_TYPE, content_type)])
+}
+
+fn response(status_code: StatusCode, text: String) -> Response<BoxBody<Bytes, std::io::Error>> {
+    Response::builder()
+        .status(status_code)
+        .body(Full::new(text.into()).map_err(|e| match e {}).boxed())
+        .unwrap()
+}
+
+async fn stream_file(path: PathBuf, file: model::File) -> Response<BoxBody<Bytes, std::io::Error>> {
+    match File::open(path).await {
+        Err(e) => {
+            log::error!("Unable to open file: {e}");
+            not_found()
+        }
+        Ok(disk_file) => {
+            let reader_stream = ReaderStream::new(disk_file);
+            let stream_body = StreamBody::new(reader_stream.map_ok(Frame::data));
+            let boxed_body = stream_body.boxed();
+
+            let response = Response::builder().body(boxed_body).unwrap();
+
+            with_headers(
+                response,
+                vec![
+                    (
+                        CONTENT_DISPOSITION,
+                        &format!("attachment; filename={}", file.name),
+                    ),
+                    (CONTENT_LENGTH, &file.content_length.to_string()),
+                ],
+            )
+        }
+    }
+}
+
+fn not_found() -> Response<BoxBody<Bytes, std::io::Error>> {
+    response(StatusCode::NOT_FOUND, templates::NOT_FOUND.to_string())
+}
+
+fn bad_request() -> Response<BoxBody<Bytes, std::io::Error>> {
+    response(StatusCode::BAD_REQUEST, templates::BAD_REQUEST.to_string())
+}
+
+fn internal_server_error() -> Response<BoxBody<Bytes, std::io::Error>> {
+    response(
+        StatusCode::INTERNAL_SERVER_ERROR,
+        templates::INTERNAL_SERVER_ERROR.to_string(),
+    )
+}
+
+pub fn with_headers(
+    response: Response<BoxBody<Bytes, std::io::Error>>,
+    headers: Vec<(HeaderName, &str)>,
+) -> Response<BoxBody<Bytes, std::io::Error>> {
+    let mut response = response;
+    let response_headers = response.headers_mut();
+    for (name, value) in headers {
+        response_headers.insert(name, HeaderValue::from_str(value).unwrap());
+    }
+    response
+}
diff --git a/src/server.py b/src/server.py
deleted file mode 100644
index 5927052..0000000
--- a/src/server.py
+++ /dev/null
@@ -1,84 +0,0 @@
-import http.server
-import logging
-import os
-import sqlite3
-import tempfile
-
-import db
-import templates
-import utils
-
-logger = logging.getLogger(__name__)
-conn = sqlite3.connect('db.sqlite3')
-files_directory = 'files'
-authorized_key = os.environ['KEY']
-
-class MyServer(http.server.BaseHTTPRequestHandler):
-    def do_GET(self):
-        match self.path:
-            case '/':
-                self._serve_str(templates.index, 200, 'text/html')
-            case '/main.js':
-                self._serve_file('public/main.js', 'application/javascript')
-            case '/main.css':
-                self._serve_file('public/main.css', 'text/css')
-            case path:
-                if path.endswith('?download'):
-                    download = True
-                    path = path[:-len('?download')]
-                else:
-                    download = False
-
-                file_id = path[1:]
-                res = db.get_file(conn, file_id)
-                if res is None:
-                    self._serve_str(templates.not_found, 404, 'text/html')
-                else:
-                    filename, expires, content_length = res
-                    disk_path = os.path.join(files_directory, file_id)
-                    if download:
-                        headers = [
-                            ('Content-Disposition', f'attachment; filename={filename}'),
-                            ('Content-Length', content_length)
-                        ]
-                        self._serve_file(disk_path, 'application/octet-stream', headers)
-                    else:
-                        href = f'{file_id}?download'
-                        self._serve_str(templates.download(href, filename, expires), 200, 'text/html')
-
-    def do_POST(self):
-        key = self.headers['X-Key']
-        if not key == authorized_key:
-            logging.info('Unauthorized to upload file: wrong key')
-            self._serve_str('Unauthorized', 401)
-
-        else:
-            logging.info('Uploading file')
-            content_length = int(self.headers['content-length'])
-            filename = utils.sanitize_filename(self.headers['X-FileName'])
-            expiration = self.headers['X-Expiration']
-
-            with tempfile.NamedTemporaryFile(delete = False) as tmp:
-              utils.transfer(self.rfile, tmp, content_length = content_length)
-
-            logging.info('File uploaded')
-            file_id = db.insert_file(conn, filename, expiration, content_length)
-            os.makedirs(files_directory, exist_ok=True)
-            os.rename(tmp.name, os.path.join(files_directory, file_id))
-
-            self._serve_str(file_id, 200)
-
-    def _serve_str(self, s, code, content_type='text/plain'):
-        self.send_response(code)
-        self.send_header('Content-type', content_type)
-        self.end_headers()
-        self.wfile.write(bytes(s, 'utf-8'))
-
-    def _serve_file(self, filename, content_type, headers = []):
-        self.send_response(200)
-        self.send_header('Content-type', content_type)
-        for header_name, header_value in headers:
-            self.send_header(header_name, header_value)
-        self.end_headers()
-        with open(filename, 'rb') as f:
-            utils.transfer(f, self.wfile)
diff --git a/src/static/main.css b/src/static/main.css
new file mode 100644
index 0000000..af0ee54
--- /dev/null
+++ b/src/static/main.css
@@ -0,0 +1,94 @@
+html {
+    margin: 0 1rem;
+    font-size: 16px;
+    line-height: 1.4rem;
+    font-family: sans-serif;
+    box-sizing: border-box;
+}
+
+*, *:before, *:after {
+    box-sizing: inherit;
+}
+
+body {
+    max-width: 30rem;
+    margin: 0 auto;
+}
+
+a {
+    text-decoration: none;
+    color: #06C;
+}
+
+h1 {
+    text-align: center;
+    font-variant: small-caps;
+    font-size: 40px;
+    letter-spacing: 0.2rem;
+    margin-bottom: 4rem;
+}
+
+.g-Link {
+    text-decoration: underline;
+}
+
+label {
+    display: flex;
+    gap: 0.5rem;
+    flex-direction: column;
+    margin-bottom: 2rem;
+}
+
+input, select {
+    font-size: inherit;
+    border: 1px solid black;
+    height: 2rem;
+    background: white;
+}
+
+input[type=file] {
+    align-content: center;
+    padding-left: 2px;
+}
+
+input[type=submit] {
+    width: 100%;
+    background: #06C;
+    cursor: pointer;
+    border: none;
+    color: white;
+}
+
+.g-Loading {
+    display: none;
+    align-items: center;
+    justify-content: center;
+    gap: 1rem;
+    margin-bottom: 2rem;
+}
+
+.g-Error {
+    text-align: center;
+    margin-bottom: 2rem;
+    color: #C00;
+}
+
+.g-Spinner {
+    width: 25px;
+    height: 25px;
+    border: 4px solid #06C;
+    border-bottom-color: transparent;
+    border-radius: 50%;
+    display: inline-block;
+    box-sizing: border-box;
+    animation: rotation 1s linear infinite;
+}
+
+@keyframes rotation {
+    0% {
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}
diff --git a/src/static/main.js b/src/static/main.js
new file mode 100644
index 0000000..40e62d6
--- /dev/null
+++ b/src/static/main.js
@@ -0,0 +1,49 @@
+window.onload = function() {
+    const form = document.querySelector('form')
+
+    if (form !== null) {
+        const submit = document.querySelector('input[type="submit"]')
+        const loading = document.querySelector('.g-Loading')
+        const error = document.querySelector('.g-Error')
+
+        function showError(msg) {
+            loading.style.display = 'none'
+            submit.disabled = false
+            error.innerText = msg
+            error.style.display = 'block'
+        }
+
+        form.onsubmit = function(event) {
+            event.preventDefault()
+
+            loading.style.display = 'flex'
+            submit.disabled = true
+            error.style.display = 'none'
+
+            const key = document.querySelector('input[name="key"]').value
+            const expiration = document.querySelector('select[name="expiration"]').value
+            const file = document.querySelector('input[name="file"]').files[0]
+            const filename = file.name.replace(/[^0-9a-zA-Z\.]/gi, '-')
+
+            // Wait a bit to prevent showing the loader too briefly
+            setTimeout(function() {
+                const xhr = new XMLHttpRequest()
+                xhr.open('POST', '/', true)
+                xhr.onload = function () {
+                    if (xhr.status === 200) {
+                        window.location = `/${xhr.responseText}`
+                    } else {
+                        showError(`Error uploading: ${xhr.status}`)
+                    }
+                }
+                xhr.onerror = function () {
+                    showError('Upload error')
+                }
+                xhr.setRequestHeader('X-FileName', filename)
+                xhr.setRequestHeader('X-Expiration', expiration)
+                xhr.setRequestHeader('X-Key', key)
+                xhr.send(file)
+            }, 500)
+        }
+    }
+}
diff --git a/src/templates.py b/src/templates.py
deleted file mode 100644
index 8125f69..0000000
--- a/src/templates.py
+++ /dev/null
@@ -1,105 +0,0 @@
-import html
-import datetime
-
-page: str = '''
-    <!doctype html>
-    <html lang="fr">
-    <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width">
-
-    <title>Files</title>
-    <link rel="stylesheet" href="/static/main.css">
-    <script src="/static/main.js"></script>
-
-    <a href="/">
-        <h1>Files</h1>
-    </a>
-'''
-
-pub index: str = f'''
-    {page}
-
-    <form>
-        <label>
-            File
-            <input type="file" name="file" required>
-        </label>
-
-        <label>
-            Expiration
-            <select name="expiration">
-                <option value="1">1 day</option>
-                <option value="2">2 days</option>
-                <option value="3">3 days</option>
-                <option value="4">4 days</option>
-                <option value="5">5 days</option>
-                <option value="6">6 days</option>
-                <option value="7" selected>7 days</option>
-                <option value="8">8 days</option>
-                <option value="9">9 days</option>
-                <option value="10">10 days</option>
-                <option value="11">11 days</option>
-                <option value="12">12 days</option>
-                <option value="13">13 days</option>
-                <option value="14">14 days</option>
-                <option value="15">15 days</option>
-                <option value="16">16 days</option>
-                <option value="17">17 days</option>
-                <option value="18">18 days</option>
-                <option value="19">19 days</option>
-                <option value="20">20 days</option>
-                <option value="21">21 days</option>
-                <option value="22">22 days</option>
-                <option value="23">23 days</option>
-                <option value="24">24 days</option>
-                <option value="25">25 days</option>
-                <option value="26">26 days</option>
-                <option value="27">27 days</option>
-                <option value="28">28 days</option>
-                <option value="29">29 days</option>
-                <option value="30">30 days</option>
-                <option value="31">31 days</option>
-            </select>
-        </label>
-
-        <label>
-            Key
-            <input type="password" name="key" required>
-        </label>
-
-        <div class="g-Loading">
-            <div class="g-Spinner"></div>
-            Uploading…
-        </div>
-
-        <div class="g-Error">
-        </div>
-
-        <input type="submit" value="Upload">
-    </form>
-'''
-
-def file_page(file_id: str, filename: str, expires: str) -> str:
-    href = f'{file_id}/download'
-    expires_in = datetime.datetime.strptime(expires, '%Y-%m-%d %H:%M:%S') - datetime.datetime.now()
-
-    print()
-    print(href)
-    print()
-
-    return f'''
-        {page}
-
-        <div>
-            <a class="g-Link" href="{html.escape(href)}">{html.escape(filename)}</a>
-            <div>
-                Expires in {expires_in}
-            </div>
-        </div>
-    '''
-
-not_found: str = f'''
-    {page}
-
-    Oops, not found!
-'''
diff --git a/src/templates.rs b/src/templates.rs
new file mode 100644
index 0000000..b551bf6
--- /dev/null
+++ b/src/templates.rs
@@ -0,0 +1,134 @@
+use chrono::Local;
+
+use crate::model::File;
+use crate::util;
+
+const PAGE: &str = r#"
+<!doctype html>
+<html lang="fr">
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width">
+
+<title>Files</title>
+<link rel="stylesheet" href="/static/main.css">
+<script src="/static/main.js"></script>
+
+<a href="/">
+    <h1>Files</h1>
+</a>
+"#;
+
+pub const INDEX: &str = const_format::concatcp!(
+    PAGE,
+    r#"
+<form>
+    <label>
+        File
+        <input type="file" name="file" required>
+    </label>
+
+    <label>
+        Expiration
+        <select name="expiration">
+            <option value="1">1 day</option>
+            <option value="2">2 days</option>
+            <option value="3">3 days</option>
+            <option value="4">4 days</option>
+            <option value="5">5 days</option>
+            <option value="6">6 days</option>
+            <option value="7" selected>7 days</option>
+            <option value="8">8 days</option>
+            <option value="9">9 days</option>
+            <option value="10">10 days</option>
+            <option value="11">11 days</option>
+            <option value="12">12 days</option>
+            <option value="13">13 days</option>
+            <option value="14">14 days</option>
+            <option value="15">15 days</option>
+            <option value="16">16 days</option>
+            <option value="17">17 days</option>
+            <option value="18">18 days</option>
+            <option value="19">19 days</option>
+            <option value="20">20 days</option>
+            <option value="21">21 days</option>
+            <option value="22">22 days</option>
+            <option value="23">23 days</option>
+            <option value="24">24 days</option>
+            <option value="25">25 days</option>
+            <option value="26">26 days</option>
+            <option value="27">27 days</option>
+            <option value="28">28 days</option>
+            <option value="29">29 days</option>
+            <option value="30">30 days</option>
+            <option value="31">31 days</option>
+        </select>
+    </label>
+
+    <label>
+        Key
+        <input type="password" name="key" required>
+    </label>
+
+    <div class="g-Loading">
+        <div class="g-Spinner"></div>
+        Uploading…
+    </div>
+
+    <div class="g-Error">
+    </div>
+
+    <input type="submit" value="Upload">
+</form>"#
+);
+
+pub const NOT_FOUND: &str = const_format::concatcp!(
+    PAGE,
+    r#"
+    <div>
+        Oops, not found.
+    </div>
+    "#
+);
+
+pub const BAD_REQUEST: &str = const_format::concatcp!(
+    PAGE,
+    r#"
+    <div>
+        Oops, bad request.
+    </div>
+    "#
+);
+
+pub const INTERNAL_SERVER_ERROR: &str = const_format::concatcp!(
+    PAGE,
+    r#"
+    <div>
+        Oops, internal server error.
+    </div>
+    "#
+);
+
+pub fn file_page(file: File) -> String {
+    let href = format!("{}/download", file.id);
+    let expiration = file.expires_at.signed_duration_since(Local::now());
+
+    format!(
+        r#"
+            {page}
+
+            <div>
+                <div>
+                    <a class="g-Link" href="{href}">{filename}</a> – {size}
+                </div>
+                <div>
+                    Expires in <b>{expiration}</b>.
+                </div>
+            </div>
+        "#,
+        page = PAGE,
+        href = html_escape::encode_text(&href),
+        filename = html_escape::encode_text(&file.name),
+        expiration = html_escape::encode_text(&util::pretty_print_duration(expiration)),
+        size = html_escape::encode_text(&util::pretty_print_bytes(file.content_length))
+    )
+}
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..9bc7cb9
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,125 @@
+use chrono::Duration;
+
+pub fn sanitize_filename(s: &str) -> String {
+    s.split('.')
+        .map(sanitize_filename_part)
+        .collect::<Vec<String>>()
+        .join(".")
+}
+
+pub fn sanitize_filename_part(s: &str) -> String {
+    s.chars()
+        .map(|c| {
+            if c.is_ascii_alphanumeric() {
+                c.to_lowercase().collect::<String>()
+            } else {
+                " ".to_string()
+            }
+        })
+        .collect::<String>()
+        .split_whitespace()
+        .collect::<Vec<&str>>()
+        .join("-")
+}
+
+pub fn pretty_print_duration(d: Duration) -> String {
+    if d.num_days() > 0 {
+        let plural = if d.num_days() > 1 { "s" } else { "" };
+        format!("{} day{}", d.num_days(), plural)
+    } else if d.num_hours() > 0 {
+        format!("{} h", d.num_hours())
+    } else if d.num_minutes() > 0 {
+        format!("{} min", d.num_minutes())
+    } else {
+        format!("{} s", d.num_seconds())
+    }
+}
+
+pub fn pretty_print_bytes(bytes: usize) -> String {
+    let ko = bytes / 1024;
+    let mo = ko / 1024;
+    let go = mo / 1024;
+    if go > 0 {
+        format!("{} GB", go)
+    } else if mo > 0 {
+        format!("{} MB", mo)
+    } else if ko > 0 {
+        format!("{} KB", ko)
+    } else {
+        format!("{} B", bytes)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_sanitize_filename() {
+        assert_eq!(sanitize_filename(""), "");
+        assert_eq!(sanitize_filename("foo bar 123"), "foo-bar-123");
+        assert_eq!(sanitize_filename("foo bar.123"), "foo-bar.123");
+        assert_eq!(sanitize_filename("foo ( test+2 ).xml"), "foo-test-2.xml");
+    }
+
+    #[test]
+    fn test_sanitize_filename_part() {
+        assert_eq!(sanitize_filename_part(""), "");
+        assert_eq!(sanitize_filename_part("foo123BAZ"), "foo123baz");
+        assert_eq!(sanitize_filename_part("foo-123-BAZ"), "foo-123-baz");
+        assert_eq!(sanitize_filename_part("[()] */+-!;?<'> ?:"), "");
+        assert_eq!(sanitize_filename_part("foo [bar] -- BAZ3"), "foo-bar-baz3");
+    }
+
+    #[test]
+    fn test_pretty_print_duration() {
+        assert_eq!(
+            pretty_print_duration(Duration::days(2)),
+            "2 days".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::hours(30)),
+            "1 day".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::days(1)),
+            "1 day".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::hours(15)),
+            "15 h".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::minutes(70)),
+            "1 h".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::minutes(44)),
+            "44 min".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::seconds(100)),
+            "1 min".to_string()
+        );
+        assert_eq!(
+            pretty_print_duration(Duration::seconds(7)),
+            "7 s".to_string()
+        );
+        assert_eq!(pretty_print_duration(Duration::zero()), "0 s".to_string());
+    }
+
+    #[test]
+    fn test_pretty_print_bytes() {
+        assert_eq!(pretty_print_bytes(0), "0 B");
+        assert_eq!(pretty_print_bytes(10), "10 B");
+        assert_eq!(pretty_print_bytes(1024), "1 KB");
+        assert_eq!(pretty_print_bytes(1100), "1 KB");
+        assert_eq!(pretty_print_bytes(54 * 1024), "54 KB");
+        assert_eq!(pretty_print_bytes(1024 * 1024), "1 MB");
+        assert_eq!(pretty_print_bytes(1300 * 1024), "1 MB");
+        assert_eq!(pretty_print_bytes(79 * 1024 * 1024), "79 MB");
+        assert_eq!(pretty_print_bytes(1024 * 1024 * 1024), "1 GB");
+        assert_eq!(pretty_print_bytes(1300 * 1024 * 1024), "1 GB");
+        assert_eq!(pretty_print_bytes(245 * 1024 * 1024 * 1024), "245 GB");
+    }
+}
diff --git a/src/utils.py b/src/utils.py
deleted file mode 100644
index 151217f..0000000
--- a/src/utils.py
+++ /dev/null
@@ -1,8 +0,0 @@
-import io
-
-def sanitize_filename(s: str) -> str:
-    return '.'.join([sanitize_filename_part(p) for p in s.split('.')])
-
-def sanitize_filename_part(s: str) -> str:
-    alnum_or_space = ''.join([c if c.isalnum() else ' ' for c in s])
-    return '-'.join(alnum_or_space.split())
diff --git a/static/main.css b/static/main.css
deleted file mode 100644
index db9a678..0000000
--- a/static/main.css
+++ /dev/null
@@ -1,71 +0,0 @@
-html {
-    margin: 0 1rem;
-}
-
-body {
-    max-width: 30rem;
-    margin: 0 auto;
-    font-family: sans-serif;
-}
-
-a {
-    text-decoration: none;
-    color: #06C;
-}
-
-h1 {
-    text-align: center;
-    font-variant: small-caps;
-    font-size: 40px;
-    letter-spacing: 0.2rem;
-    margin-bottom: 4rem;
-}
-
-.g-Link {
-    text-decoration: underline;
-}
-
-label {
-    display: flex;
-    gap: 0.5rem;
-    flex-direction: column;
-    margin-bottom: 2rem;
-}
-
-input[type=submit] {
-    width: 100%;
-}
-
-.g-Loading {
-    display: none;
-    align-items: center;
-    justify-content: center;
-    gap: 1rem;
-    margin-bottom: 2rem;
-}
-
-.g-Error {
-    text-align: center;
-    margin-bottom: 2rem;
-    color: #C00;
-}
-
-.g-Spinner {
-    width: 25px;
-    height: 25px;
-    border: 4px solid #06C;
-    border-bottom-color: transparent;
-    border-radius: 50%;
-    display: inline-block;
-    box-sizing: border-box;
-    animation: rotation 1s linear infinite;
-}
-
-@keyframes rotation {
-    0% {
-        transform: rotate(0deg);
-    }
-    100% {
-        transform: rotate(360deg);
-    }
-}
diff --git a/static/main.js b/static/main.js
deleted file mode 100644
index 1729d38..0000000
--- a/static/main.js
+++ /dev/null
@@ -1,48 +0,0 @@
-window.onload = function() {
-    const form = document.querySelector('form')
-
-    if (form !== null) {
-        const submit = document.querySelector('input[type="submit"]')
-        const loading = document.querySelector('.g-Loading')
-        const error = document.querySelector('.g-Error')
-
-        function showError(msg) {
-            loading.style.display = 'none'
-            submit.disabled = false
-            error.innerText = msg
-            error.style.display = 'block'
-        }
-
-        form.onsubmit = function(event) {
-            event.preventDefault()
-
-            loading.style.display = 'flex'
-            submit.disabled = true
-            error.style.display = 'none'
-
-            const key = document.querySelector('input[name="key"]').value
-            const expiration = document.querySelector('select[name="expiration"]').value
-            const file = document.querySelector('input[name="file"]').files[0]
-
-            // Wait a bit to prevent showing the loader too briefly
-            setTimeout(function() {
-                const xhr = new XMLHttpRequest()
-                xhr.open('POST', '/', true)
-                xhr.onload = function () {
-                    if (xhr.status === 200) {
-                        window.location = `/${xhr.responseText}`
-                    } else {
-                        showError(`Error uploading: ${xhr.status}`)
-                    }
-                }
-                xhr.onerror = function () {
-                    showError('Upload error')
-                }
-                xhr.setRequestHeader('X-FileName', file.name)
-                xhr.setRequestHeader('X-Expiration', expiration)
-                xhr.setRequestHeader('X-Key', key)
-                xhr.send(file)
-            }, 500)
-        }
-    }
-}
-- 
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