express-inject-middleware/lib/index.js

Inject stack of middlewares into given routes or middlewares.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var layer = require("express/lib/router/layer");
function distinctMiddlewaresByReference(middlewares) {
    var distinct = [];
    middlewares.forEach(function (middleware) {
        if (!distinct.some(function (dm) { return dm === middleware; })) {
            distinct.push(middleware);
        }
    });
    return distinct;
}
function injectMiddlewaresRecursive(middleware, injectLayers, appCount) {
    var stack = middleware.stack || (middleware._router && middleware._router.stack);
    stack.forEach(function (layer, index) {
        var _a;
        if (layer.route) {
            if (!(middleware.name === 'app' && index < stack.length - appCount)) {
                (_a = layer.route.stack).unshift.apply(_a, injectLayers);
            }
        }
        else if (layer.name === 'router' || layer.name === 'bound dispatch') {
            injectMiddlewaresRecursive(layer.handle, injectLayers, appCount);
        }
    });
}
function injectMiddleware(injectedMiddlewares, groupingMiddlewares) {
    var distinctMiddlewares = distinctMiddlewaresByReference(groupingMiddlewares);
    var injectLayers = injectedMiddlewares.map(function (i) { return new layer('', {}, i); });
    var appCount = groupingMiddlewares.filter(function (m) { return m.name === 'app'; }).length;
    distinctMiddlewares.forEach(function (middleware) {
        injectMiddlewaresRecursive(middleware, injectLayers, appCount);
    });
    return (function (req, res, next) {
        return next();
    });
}
exports.injectMiddleware = injectMiddleware;
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