static-koa-router/Serve.js

Serve static file through koa-router

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
const Send = require("koa-send");
const Path = require("path");
function getCtxPath(koaRouter, ctx) {
    const router = koaRouter;
    const routerPrefix = router.opts.prefix;
    const path = ctx.path.replace(routerPrefix, "");
    return path || "/";
}
function Serve(dirPath, router, options) {
    const resolvedPath = Path.resolve(dirPath);
    const definedOptions = options || {};
    const sendOptions = Object.assign({}, definedOptions, { index: definedOptions.index || "index.html", root: resolvedPath });
    let middleware;
    if (!definedOptions.defer) {
        middleware = (ctx, next) => __awaiter(this, void 0, void 0, function* () {
            let done;
            if (ctx.method === "HEAD" || ctx.method === "GET") {
                try {
                    done = yield Send(ctx, getCtxPath(router, ctx), sendOptions);
                }
                catch (err) {
                    if (err.status !== 404) {
                        throw err;
                    }
                }
            }
            if (!done) {
                yield next();
            }
        });
    }
    else {
        middleware = (ctx, next) => __awaiter(this, void 0, void 0, function* () {
            yield next();
            if (ctx.method !== "HEAD" && ctx.method !== "GET") {
                return;
            }
            // response is already handled
            if (ctx.body != null || ctx.status !== 404) {
                return;
            }
            try {
                yield Send(ctx, ctx.path, sendOptions);
            }
            catch (err) {
                if (err.status !== 404) {
                    throw err;
                }
            }
        });
    }
    return router.head("*", middleware).get("*", middleware);
}
exports.Serve = Serve;
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