yasui/lib/utils/route-handler.js

Lightweight Express-based framework for REST and web APIs

import { ReflectMetadata, getMetadata } from './reflect.js';
import { HttpCode } from '../enums/index.js';
export function routeHandler(target, descriptor, params, pipes, isMiddleware, defaultStatus = HttpCode.OK) {
    const routeFunction = descriptor.value;
    return async (req, res, next) => {
        req.source = target.name;
        const routeHandlerArgs = { req, res, next };
        const self = getMetadata(ReflectMetadata.SELF, target.prototype) || {};
        const methodDeps = getMetadata(ReflectMetadata.RESOLVED_METHOD_DEPS, self, String(descriptor.value.name)) || {};
        const allIndexes = [
            ...params.map(p => p.index),
            ...Object.keys(methodDeps).map(k => parseInt(k))
        ];
        const maxIndex = allIndexes.length > 0 ? Math.max(...allIndexes) : -1;
        const args = new Array(maxIndex + 1);
        for (const param of params) {
            let value = param.path.reduce((prev, curr) => prev && prev[curr] || null, routeHandlerArgs);
            if (value !== null && param.type && shouldCastParam(param.path)) {
                value = castParamValue(value, param.type, param.itemsType);
            }
            if (pipes.length > 0) {
                const metadata = {
                    type: param.path[1],
                    metatype: param.type,
                    name: param.path[2]
                };
                for (const pipe of pipes) {
                    value = await pipe.transform(value, metadata);
                }
            }
            args[param.index] = value;
        }
        for (const indexStr in methodDeps) {
            const index = parseInt(indexStr);
            args[index] = methodDeps[index];
        }
        try {
            const result = await routeFunction.apply(self, args);
            if (!res.headersSent) {
                if (result !== undefined || !isMiddleware) {
                    res.status(defaultStatus).json(result);
                }
                else {
                    next();
                }
            }
        }
        catch (err) {
            next(err);
        }
    };
}
function shouldCastParam(path) {
    if (path.length < 3) {
        return false;
    }
    return (path[1] === 'params' ||
        path[1] === 'query' ||
        path[1] === 'headers');
}
function castParamValue(value, paramType, itemsType) {
    switch (paramType) {
        case Number:
            return Number(value);
        case Boolean:
            return value === 'true' || value === '1';
        case Date:
            return new Date(value);
        case Array:
            return Array.isArray(value)
                ? (itemsType ? value.map(v => castParamValue(v, itemsType)) : value)
                : [itemsType ? castParamValue(value, itemsType) : value];
        case String:
            return value;
        default:
            try {
                return JSON.parse(value);
            }
            catch {
                return null;
            }
    }
}
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