edgerender/response.js

Render at the edge

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Redirect = exports.HttpError = exports.json_response = exports.default_security_headers = exports.MimeTypes = void 0;
var MimeTypes;
(function (MimeTypes) {
    MimeTypes["html"] = "text/html";
    MimeTypes["plaintext"] = "text/plain";
    MimeTypes["json"] = "application/json";
    MimeTypes["ico"] = "image/vnd.microsoft.icon";
    MimeTypes["octetStream"] = "application/octet-stream";
})(MimeTypes = exports.MimeTypes || (exports.MimeTypes = {}));
exports.default_security_headers = {
    'X-Frame-Options': 'DENY',
    'Strict-Transport-Security': 'max-age=31536000; includeSubDomains; preload',
    'X-XSS-Protection': '1; mode=block',
    'X-Content-Type-Options': 'nosniff',
    'Referrer-Policy': 'origin',
};
function json_response(obj, status = 200) {
    return {
        status,
        body: JSON.stringify(obj, null, 2),
        mime_type: MimeTypes.json,
    };
}
exports.json_response = json_response;
class HttpError extends Error {
    status;
    body;
    headers;
    constructor(status, body, headers = undefined) {
        if (headers) {
            super(`HTTP Error ${status}: ${body}, headers=${JSON.stringify(headers)}`);
        }
        else {
            super(`HTTP Error ${status}: ${body}`);
        }
        this.status = status;
        this.body = body;
        this.headers = headers || {};
    }
    response(request) {
        if (this.status > 300 && this.status < 400) {
            const { location } = this.headers;
            if (location && !/^https?:\/\//.test(location)) {
                const { origin, pathname } = new URL(request.url);
                let path;
                if (location.startsWith('/')) {
                    path = location;
                }
                else if (location.startsWith('.')) {
                    // special case where double slashes are common
                    if (pathname.endsWith('/') && location.startsWith('./')) {
                        path = `${pathname}${location.slice(2)}`;
                    }
                    else {
                        path = `${pathname}${location.slice(1)}`;
                    }
                }
                else {
                    path = `${pathname}${location}`;
                }
                this.headers.location = `${origin}${path}`;
            }
        }
        return {
            body: `${this.status}: ${this.body}`,
            mime_type: MimeTypes.plaintext,
            status: this.status,
            headers: this.headers,
        };
    }
}
exports.HttpError = HttpError;
class Redirect extends HttpError {
    constructor(location, status = 307, body = null) {
        super(status, body || `Redirecting to "${location}"`, { location });
    }
}
exports.Redirect = Redirect;
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