♻️ Move trpc client code to app (#906)

packages/backend/trpc/context.ts

@@ -0,0 +1,43 @@
+import { EmailClient } from "@rallly/emails";
+import { inferAsyncReturnType, TRPCError } from "@trpc/server";
+import { CreateNextContextOptions } from "@trpc/server/adapters/next";
+
+export type GetUserFn = (opts: CreateNextContextOptions) => Promise<{
+  id: string;
+  isGuest: boolean;
+} | null>;
+
+export interface TRPCContextParams {
+  getUser: GetUserFn;
+  emailClient: EmailClient;
+  isSelfHosted: boolean;
+  isEmailBlocked?: (email: string) => boolean;
+  /**
+   * Takes a relative path and returns an absolute URL to the app
+   * @param path
+   * @returns absolute URL
+   */
+  absoluteUrl: (path?: string) => string;
+  shortUrl: (path?: string) => string;
+}
+
+export const createTRPCContext = async (
+  opts: CreateNextContextOptions,
+  { getUser, ...params }: TRPCContextParams,
+) => {
+  const user = await getUser(opts);
+
+  if (!user) {
+    throw new TRPCError({
+      code: "BAD_REQUEST",
+      message: "Request has no session",
+    });
+  }
+
+  return {
+    user,
+    ...params,
+  };
+};
+
+export type TRPCContext = inferAsyncReturnType<typeof createTRPCContext>;