feat: add credentials authentication (#1)

packages/auth/providers/credentials.ts

@@ -0,0 +1,49 @@
+import type Credentials from "@auth/core/providers/credentials";
+import bcrypt from "bcrypt";
+
+import { db, eq } from "@alparr/db";
+import { users } from "@alparr/db/schema/sqlite";
+import { signInSchema } from "@alparr/validation";
+
+type CredentialsConfiguration = Parameters<typeof Credentials>[0];
+
+export const credentialsConfiguration = {
+  type: "credentials",
+  name: "Credentials",
+  credentials: {
+    name: {
+      label: "Username",
+      type: "text",
+    },
+    password: {
+      label: "Password",
+      type: "password",
+    },
+  },
+  async authorize(credentials) {
+    const data = await signInSchema.parseAsync(credentials);
+
+    const user = await db.query.users.findFirst({
+      where: eq(users.name, data.name),
+    });
+
+    if (!user?.password) {
+      return null;
+    }
+
+    console.log(`user ${user.name} is trying to log in. checking password...`);
+    const isValidPassword = await bcrypt.compare(data.password, user.password);
+
+    if (!isValidPassword) {
+      console.log(`password for user ${user.name} was incorrect`);
+      return null;
+    }
+
+    console.log(`user ${user.name} successfully authorized`);
+
+    return {
+      id: user.id,
+      name: user.name,
+    };
+  },
+} satisfies CredentialsConfiguration;

packages/auth/providers/empty.ts

@@ -0,0 +1,16 @@
+import type { OAuthConfig } from "next-auth/providers";
+
+export function EmptyNextAuthProvider(): OAuthConfig<unknown> {
+  return {
+    id: "empty",
+    name: "Empty",
+    type: "oauth",
+    profile: () => {
+      throw new Error(
+        "EmptyNextAuthProvider can not be used and is only a placeholder because credentials authentication can not be used as session authentication without additional providers.",
+      );
+    },
+    issuer: "empty",
+    authorization: new URL("https://example.empty"),
+  };
+}