base service with authentication and user creation

db/Dockerfile

@@ -0,0 +1,13 @@
+FROM docker.io/library/postgres:15
+
+# Set environment variables
+ENV POSTGRES_USER=chatapp
+ENV POSTGRES_PASSWORD=secret
+ENV POSTGRES_DB=chatapp
+
+# Copy the initialization SQL script
+COPY init.sql /docker-entrypoint-initdb.d/
+COPY mock_data.sql /docker-entrypoint-initdb.d/
+
+# Expose port 5432
+EXPOSE 5432

db/init.sql

@@ -0,0 +1,26 @@
+CREATE TABLE IF NOT EXISTS user (
+    id SERIAL PRIMARY KEY,
+    email TEXT UNIQUE,
+    username TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS channel (
+    id SERIAL PRIMARY KEY,
+    owner INT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS membership (
+  user INT REFERENCES user(id),
+  channel INT REFERENCES channel(id),
+  PRIMARY KEY (user, channel)
+);
+
+CREATE TABLE IF NOT EXISTS message (
+  id BIGSERIAL PRIMARY KEY,
+  sender INT REFERENCES user(id) NOT NULL,
+  channel INT REFERENCES channel(id) NOT NULL,
+  type VARCHAR(32) NOT NULL,
+  content TEXT NOT NULL
+);

db/mock_data.sql

@@ -0,0 +1,24 @@
+INSERT INTO user (username, password_hash, email) VALUES
+('alice', '$argon2id$v=19$m=19456,t=2,p=1$W0OzC/dmZQt7/xUJt4E9hA$cYiUC91a5yCQU9tDUadw0FKjUmTRv453cYwu1nfMKUQ', 'alice@example.com'),
+('bob', '$argon2id$v=19$m=19456,t=2,p=1$1T7VaQps1X5Wj+TJHt8FIQ$/hA7PSITskjELwfNw+s6BvCJmUA4dDDrSGJvDvHx7Kc', 'bob@example.com'),
+('carol', '$argon2id$v=19$m=19456,t=2,p=1$Kw4Re4lggxzDldu3vNl2PA$6DP4MPftfXI77g8EZRXYmWgcnVnAKLq0dkZOb/eBIC8', 'carol@example.com');
+
+INSERT INTO channel (owner, name) VALUES
+(1, 'General Discussion'),
+(2, 'Tech Talk'),
+(1, 'Random Memes');
+
+INSERT INTO membership (user, channel) VALUES
+(1, 1),  -- Alice in General Discussion
+(2, 1),  -- Bob in General Discussion
+(2, 2),  -- Bob in Tech Talk
+(3, 1),  -- Carol in General Discussion
+(1, 3);  -- Alice in Random Memes
+
+INSERT INTO message (sender, channel, type, content) VALUES
+(1, 1, 'text', 'Hey everyone, hows it going?'),
+(2, 1, 'text', 'All good! Just trying to get through some work.'),
+(3, 1, 'text', 'Hello! How are you guys?'),
+(2, 2, 'text', 'Anyone seen the new tech updates?'),
+(1, 3, 'image', 'Heres a funny meme I found!'),
+(3, 1, 'text', 'I love how active this channel is!');

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "chatapp";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { nixpkgs, flake-utils, rust-overlay, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ rust-overlay.overlays.default ];
+        pkgs = import nixpkgs { inherit system overlays; };
+        rust = pkgs.rust-bin.stable.latest.default;
+        openssl = pkgs.openssl;
+      in {
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          pname = "-server";
+          version = "0.1.0";
+
+          src = ./.;
+          cargoLock = { lockFile = ./Cargo.lock; };
+
+          nativeBuildInputs = [ rust pkgs.pkg-config ];
+
+          buildInputs = [ openssl ];
+
+          OPENSSL_LIB_DIR = "${openssl.out}/lib";
+          OPENSSL_INCLUDE_DIR = "${openssl.dev}/include";
+          PKG_CONFIG_PATH = "${openssl.dev}/lib/pkgconfig";
+        };
+
+        devShells.default = pkgs.mkShell {
+          packages =
+            [ rust pkgs.cargo pkgs.rust-analyzer pkgs.pkg-config openssl ];
+          OPENSSL_DIR = openssl.dev;
+          PKG_CONFIG_PATH = "${openssl.dev}/lib/pkgconfig";
+        };
+      });
+}

run_db.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+podman build -t chatapp-db ./db
+podman run --replace -d \
+    --name chatapp-db \
+    -p 5432:5432 \
+    chatapp-db