feat: add credentials authentication (#1)

packages/api/src/router/user.ts

@@ -0,0 +1,39 @@
+import "server-only";
+
+import { TRPCError } from "@trpc/server";
+
+import { createSalt, hashPassword } from "@alparr/auth";
+import { createId, schema } from "@alparr/db";
+import { initUserSchema } from "@alparr/validation";
+
+import { createTRPCRouter, publicProcedure } from "../trpc";
+
+export const userRouter = createTRPCRouter({
+  initUser: publicProcedure
+    .input(initUserSchema)
+    .mutation(async ({ ctx, input }) => {
+      const firstUser = await ctx.db.query.users.findFirst({
+        columns: {
+          id: true,
+        },
+      });
+
+      if (firstUser) {
+        throw new TRPCError({
+          code: "FORBIDDEN",
+          message: "User already exists",
+        });
+      }
+
+      const salt = await createSalt();
+      const hashedPassword = await hashPassword(input.password, salt);
+
+      const userId = createId();
+      await ctx.db.insert(schema.users).values({
+        id: userId,
+        name: input.username,
+        password: hashedPassword,
+        salt,
+      });
+    }),
+});