infoalloggi-monorepo/apps/infoalloggi/src/server/api/trpc.ts

/**
 * YOU PROBABLY DON'T NEED TO EDIT THIS FILE, UNLESS:
 * 1. You want to modify request context (see Part 1).
 * 2. You want to create a new middleware or type of procedure (see Part 3).
 *
 * TL;DR - This is where all the tRPC server stuff is created and plugged in. The pieces you will
 * need to use are documented accordingly near the end.
 */

import { initTRPC, TRPCError } from "@trpc/server";
import type { CreateNextContextOptions } from "@trpc/server/adapters/next";

import superjson from "superjson";
import z, { ZodError } from "zod/v4";

import type { NextApiRequest, NextApiResponse } from "next";
import { env } from "~/env.mjs";
import { zUserId } from "~/server/utils/zod_types";
import { ACCESS_TOKEN_COOKIE_NAME, verifyToken } from "~/server/auth/jwt";

/**
 * 1. CONTEXT
 *
 * This section defines the "contexts" that are available in the backend API.
 *
 * These allow you to access things when processing a request, like the database, the session, etc.
 */
export const sessionSchema = z.object({
  id: zUserId,
  username: z.string(),
  email: z.email(),
  isAdmin: z.boolean(),
  isBlocked: z.boolean(),
  nome: z.string(),
});

export type Session = z.infer<typeof sessionSchema>;

interface CreateInnerContextOptions extends Partial<CreateNextContextOptions> {
  session: Session | null;
  res?: NextApiResponse;
  req?: NextApiRequest;
}

export function createInnerTRPCContext(opts: CreateInnerContextOptions) {
  return {
    ...opts,
    session: opts.session,
  };
}

export const createTRPCContext = async ({
  req,
  res,
}: Partial<CreateNextContextOptions>) => {
  if (!req || !res) {
    throw new Error(
      "You are missing `req` or `res` in your call to createTRPCContext.",
    );
  }

  const accessToken = req.cookies[ACCESS_TOKEN_COOKIE_NAME];
  // Get the session from the server using the getServerSession wrapper function

  const session = accessToken ? await verifyToken(accessToken) : null;
  const contextInner = createInnerTRPCContext({ session });
  return {
    ...contextInner,
    res,
    req,
  };
};

export type Context = Awaited<ReturnType<typeof createInnerTRPCContext>>;

/**
 * 2. INITIALIZATION
 *
 * This is where the tRPC API is initialized, connecting the context and transformer. We also parse
 * ZodErrors so that you get typesafety on the frontend if your procedure fails due to validation
 * errors on the backend.
 */

export const t = initTRPC.context<Context>().create({
  transformer: superjson,
  errorFormatter({ shape, error }) {
    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.cause instanceof ZodError ? z.treeifyError(error.cause) : null,
      },
    };
  },
  sse: {
    //maxDurationMs: 5 * 60 * 1_000, // 5 minutes
    ping: {
      enabled: true,
      intervalMs: 3_000,
    },
    client: {
      reconnectAfterInactivityMs: 5_000,
    },
  },
});

/**
 * 3. ROUTER & PROCEDURE (THE IMPORTANT BIT)
 *
 * These are the pieces you use to build your tRPC API. You should import these a lot in the
 * "/src/server/api/routers" directory.
 */

/**
 * This is how you create new routers and sub-routers in your tRPC API.
 *
 * @see https://trpc.io/docs/router
 */
export const createTRPCRouter = t.router;

/**
 * Public (unauthenticated) procedure
 *
 * This is the base piece you use to build new queries and mutations on your tRPC API. It does not
 * guarantee that a user querying is authorized, but you can still access user session data if they
 * are logged in.
 */
export const publicProcedure = t.procedure;

/** Reusable middleware that enforces users are logged in before running the procedure. */
const enforceUserIsAuthed = t.middleware(({ ctx, next, path }) => {
  if (!ctx.session) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not logged, error in path: ${path}`,
    });
  }
  return next({
    ctx: {
      // infers the `session` as non-nullable
      session: { ...ctx.session },
    },
  });
});

/**
 * Protected (authenticated) procedure
 *
 * If you want a query or mutation to ONLY be accessible to logged in users, use this. It verifies
 * the session is valid and guarantees `ctx.session.user` is not null.
 *
 * @see https://trpc.io/docs/procedures
 */
export const protectedProcedure = t.procedure.use(enforceUserIsAuthed);

/** Reusable middleware that enforces users are logged in before running the procedure. */
const enforceUserIsAdmin = t.middleware(({ ctx, next, path }) => {
  if (!ctx.session || !ctx.session.isAdmin) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not Admin, error in path: ${path}`,
    });
  }
  return next({
    ctx: {
      // infers the `session` as non-nullable
      session: { ...ctx.session },
    },
  });
});

/**
 * Protected (authenticated) procedure
 *
 * If you want a query or mutation to ONLY be accessible to logged in users, use this. It verifies
 * the session is valid and guarantees `ctx.session.user` is not null.
 *
 * @see https://trpc.io/docs/procedures
 */
export const adminProcedure = t.procedure.use(enforceUserIsAdmin);

export const apiProcedure = publicProcedure.use((opts) => {
  if (!opts.ctx.req || !opts.ctx.res) {
    throw new Error("You are missing `req` or `res` in your call.");
  }
  return opts.next({
    ctx: {
      // We overwrite the context with the truthy `req` & `res`, which will also overwrite the types used in your procedure.
      req: opts.ctx.req,
      res: opts.ctx.res,
    },
  });
});

const enforceProtectedApi = t.middleware(async ({ ctx, next, path }) => {
  if (!ctx.req || !ctx.res) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not Admin, error in path: ${path}`,
    });
  }

  const basicAuth = ctx.req.headers.authorization;
  if (!basicAuth) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not Admin, error in path: ${path}`,
    });
  }

  const authValue = basicAuth.split(" ")[1];

  if (!authValue) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not Admin, error in path: ${path}`,
    });
  }

  const [user, pwd] = atob(authValue).split(":");

  if (user !== env.EXP_API_USER || pwd !== env.EXP_API_PASS) {
    throw new TRPCError({
      code: "UNAUTHORIZED",
      message: `User is not Admin, error in path: ${path}`,
    });
  }

  return next({
    ctx: {
      // infers the `session` as non-nullable
      req: ctx.req,
      res: ctx.res,
    },
  });
});

export const protectedApiProcedure = publicProcedure.use(enforceProtectedApi);