yasui/lib/decorators/pipes.decorator.js

Lightweight Express-based framework for REST and web APIs

import { Injectable } from './injectable.decorator.js';
import { ReflectMetadata, defineMetadata, getMetadata } from '../utils/reflect.js';
export const PipeTransform = Injectable;
export function UsePipes(...pipes) {
    return function (target, propertyKey, descriptor) {
        if (propertyKey && descriptor) {
            defineMetadata(ReflectMetadata.PIPES, pipes, target, propertyKey);
        }
        else {
            defineMetadata(ReflectMetadata.PIPES, pipes, target.prototype);
        }
    };
}
export function createPipeMiddleware(route, target, pipes) {
    return async (req, res, next) => {
        const routeParams = getMetadata(ReflectMetadata.PARAMS, target.prototype, route.methodName) || [];
        for (const param of routeParams) {
            const [, paramType, propertyName] = param.path;
            const source = req[paramType];
            const metadata = {
                type: paramType,
                metatype: param.type,
                name: propertyName || ''
            };
            let paramValue = propertyName
                ? source?.[propertyName]
                : source;
            for (const pipe of pipes) {
                paramValue = await pipe.transform(paramValue, metadata);
            }
            if (propertyName) {
                source[propertyName] = paramValue;
            }
            else {
                req[paramType] = paramValue;
            }
        }
        next();
    };
}
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