73 lines
2.0 KiB
TypeScript
73 lines
2.0 KiB
TypeScript
import { IncomingMessage } from "http";
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import { parse } from "url";
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import { ParsedRequest, Theme } from "./types";
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export function parseRequest(req: IncomingMessage) {
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console.log("HTTP " + req.url);
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const { pathname, query } = parse(req.url || "/", true);
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const { fontSize, images, widths, heights, theme, md } = query || {};
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if (Array.isArray(fontSize)) {
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throw new Error("Expected a single fontSize");
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}
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if (Array.isArray(theme)) {
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throw new Error("Expected a single theme");
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}
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const arr = (pathname || "/").slice(1).split(".");
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let extension = "";
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let text = "";
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if (arr.length === 0) {
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text = "";
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} else if (arr.length === 1) {
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text = arr[0];
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} else {
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extension = arr.pop() as string;
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text = arr.join(".");
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}
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const parsedRequest: ParsedRequest = {
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fileType: extension === "jpeg" ? extension : "png",
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text: decodeURIComponent(text),
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theme: theme === "dark" ? "dark" : "light",
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md: md === "1" || md === "true",
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fontSize: fontSize || "96px",
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images: getArray(images),
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widths: getArray(widths),
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heights: getArray(heights),
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};
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parsedRequest.images = getDefaultImages(
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parsedRequest.images,
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parsedRequest.theme
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);
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return parsedRequest;
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}
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function getArray(stringOrArray: string[] | string | undefined): string[] {
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if (typeof stringOrArray === "undefined") {
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return [];
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} else if (Array.isArray(stringOrArray)) {
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return stringOrArray;
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} else {
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return [stringOrArray];
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}
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}
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function getDefaultImages(images: string[], theme: Theme): string[] {
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const defaultImage =
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theme === "light"
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? "https://assets.vercel.com/image/upload/front/assets/design/vercel-triangle-black.svg"
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: "https://assets.vercel.com/image/upload/front/assets/design/vercel-triangle-white.svg";
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if (!images || !images[0]) {
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return [defaultImage];
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}
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if (
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!images[0].startsWith("https://assets.vercel.com/") &&
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!images[0].startsWith("https://assets.zeit.co/")
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) {
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images[0] = defaultImage;
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}
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return images;
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}
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