元数据

过程元数据允许你添加可选的过程特定 meta 属性，该属性将在所有 中间件 函数参数中可用。

¥Procedure metadata allows you to add an optional procedure specific meta property which will be available in all middleware function parameters.

提示

如果你想为应用公开与 REST 兼容的端点，请将元数据与 trpc-openapi 一起使用。

¥Use metadata together with trpc-openapi if you want to expose REST-compatible endpoints for your application.

使用类型化元数据创建路由

¥Create router with typed metadata

tsx
import { initTRPC } from '@trpc/server';
// [...]
interface Meta {
  authRequired: boolean;
}
export const t = initTRPC.context<Context>().meta<Meta>().create();
export const appRouter = t.router({
  // [...]
});

tsx
import { initTRPC } from '@trpc/server';
// [...]
interface Meta {
  authRequired: boolean;
}
export const t = initTRPC.context<Context>().meta<Meta>().create();
export const appRouter = t.router({
  // [...]
});

每个路由身份验证设置的示例

¥Example with per route authentication settings

server.ts
tsx
import { initTRPC } from '@trpc/server';
// [...]
interface Meta {
  authRequired: boolean;
}
export const t = initTRPC.context<Context>().meta<Meta>().create();
export const authedProcedure = t.procedure.use(async (opts) => {
  const { meta, next, ctx } = opts;
  // only check authorization if enabled
  if (meta?.authRequired && !ctx.user) {
    throw new TRPCError({ code: 'UNAUTHORIZED' });
  }
  return next();
});
export const appRouter = t.router({
  hello: authedProcedure.meta({ authRequired: false }).query(() => {
    return {
      greeting: 'hello world',
    };
  }),
  protectedHello: authedProcedure.meta({ authRequired: true }).query(() => {
    return {
      greeting: 'hello-world',
    };
  }),
});

server.ts
tsx
import { initTRPC } from '@trpc/server';
// [...]
interface Meta {
  authRequired: boolean;
}
export const t = initTRPC.context<Context>().meta<Meta>().create();
export const authedProcedure = t.procedure.use(async (opts) => {
  const { meta, next, ctx } = opts;
  // only check authorization if enabled
  if (meta?.authRequired && !ctx.user) {
    throw new TRPCError({ code: 'UNAUTHORIZED' });
  }
  return next();
});
export const appRouter = t.router({
  hello: authedProcedure.meta({ authRequired: false }).query(() => {
    return {
      greeting: 'hello world',
    };
  }),
  protectedHello: authedProcedure.meta({ authRequired: true }).query(() => {
    return {
      greeting: 'hello-world',
    };
  }),
});

默认元、链接和浅合并

¥Default meta, chaining, and shallow merging

你可以为元类型设置默认值，如果你将元链接到基本过程之上，它将进行浅合并。

¥You can set default values for your meta type, and if you chain meta on top of a base procedure it will be shallow merged.

tsx
import { initTRPC } from '@trpc/server';
interface Meta {
  authRequired: boolean;
  role?: 'user' | 'admin'
}
export const t = initTRPC
  .context<Context>()
  .meta<Meta>()
  .create({
    // Set a default value
    defaultMeta: { authRequired: false }
  });
const publicProcedure = t.procedure
// ^ Default Meta: { authRequired: false }
const authProcedure = publicProcedure
  .use(authMiddleware)
  .meta({
    authRequired: true;
    role: 'user'
  });
// ^ Meta: { authRequired: true, role: 'user' }
const adminProcedure = authProcedure
  .meta({
    role: 'admin'
  });
// ^ Meta: { authRequired: true, role: 'admin' }

tsx
import { initTRPC } from '@trpc/server';
interface Meta {
  authRequired: boolean;
  role?: 'user' | 'admin'
}
export const t = initTRPC
  .context<Context>()
  .meta<Meta>()
  .create({
    // Set a default value
    defaultMeta: { authRequired: false }
  });
const publicProcedure = t.procedure
// ^ Default Meta: { authRequired: false }
const authProcedure = publicProcedure
  .use(authMiddleware)
  .meta({
    authRequired: true;
    role: 'user'
  });
// ^ Meta: { authRequired: true, role: 'user' }
const adminProcedure = authProcedure
  .meta({
    role: 'admin'
  });
// ^ Meta: { authRequired: true, role: 'admin' }