mirror of
https://github.com/dillonkearns/elm-pages.git
synced 2024-08-15 11:10:21 +03:00
209 lines
5.3 KiB
JavaScript
209 lines
5.3 KiB
JavaScript
import * as fs from "fs";
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export default async function run({
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renderFunctionFilePath,
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routePatterns,
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apiRoutePatterns,
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}) {
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console.log("Running Netlify adapter");
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ensureDirSync("functions/render");
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ensureDirSync("functions/server-render");
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fs.copyFileSync(
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renderFunctionFilePath,
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"./functions/render/elm-pages-cli.mjs"
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);
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fs.copyFileSync(
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renderFunctionFilePath,
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"./functions/server-render/elm-pages-cli.mjs"
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);
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fs.writeFileSync("./functions/render/index.mjs", rendererCode(true));
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fs.writeFileSync("./functions/server-render/index.mjs", rendererCode(false));
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// TODO rename functions/render to functions/fallback-render
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// TODO prepend instead of writing file
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const apiServerRoutes = apiRoutePatterns.filter(isServerSide);
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ensureValidRoutePatternsForNetlify(apiServerRoutes);
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const apiRouteRedirects = apiServerRoutes
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.map((apiRoute) => {
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if (apiRoute.kind === "prerender-with-fallback") {
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return `${apiPatternToRedirectPattern(
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apiRoute.pathPattern
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)} /.netlify/builders/render 200`;
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} else if (apiRoute.kind === "serverless") {
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return `${apiPatternToRedirectPattern(
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apiRoute.pathPattern
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)} /.netlify/functions/server-render 200`;
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} else {
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throw "Unhandled API Server Route";
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}
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})
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.join("\n");
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const redirectsFile =
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routePatterns
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.filter(isServerSide)
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.map((route) => {
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if (route.kind === "prerender-with-fallback") {
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return `${route.pathPattern} /.netlify/builders/render 200
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${route.pathPattern}/content.dat /.netlify/builders/render 200`;
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} else {
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return `${route.pathPattern} /.netlify/functions/server-render 200
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${route.pathPattern}/content.dat /.netlify/functions/server-render 200`;
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}
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})
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.join("\n") +
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"\n" +
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apiRouteRedirects +
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"\n";
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fs.writeFileSync("dist/_redirects", redirectsFile);
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}
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function ensureValidRoutePatternsForNetlify(apiRoutePatterns) {
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const invalidNetlifyRoutes = apiRoutePatterns.filter((apiRoute) =>
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apiRoute.pathPattern.some(({ kind }) => kind === "hybrid")
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);
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if (invalidNetlifyRoutes.length > 0) {
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throw (
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"Invalid Netlify routes!\n" +
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invalidNetlifyRoutes
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.map((value) => JSON.stringify(value, null, 2))
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.join(", ")
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);
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}
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}
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function isServerSide(route) {
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return (
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route.kind === "prerender-with-fallback" || route.kind === "serverless"
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);
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}
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/**
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* @param {boolean} isOnDemand
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*/
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function rendererCode(isOnDemand) {
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return `import * as elmPages from "./elm-pages-cli.mjs";
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import * as busboy from "busboy";
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${
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isOnDemand
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? `import { builder } from "@netlify/functions";
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export const handler = builder(render);`
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: `
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export const handler = render;`
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}
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/**
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* @param {import('aws-lambda').APIGatewayProxyEvent} event
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* @param {any} context
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*/
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async function render(event, context) {
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try {
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const renderResult = await elmPages.render(await reqToJson(event));
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const { headers, statusCode } = renderResult;
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if (renderResult.kind === "bytes") {
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return {
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body: Buffer.from(renderResult.body).toString("base64"),
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isBase64Encoded: true,
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multiValueHeaders: {
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"Content-Type": ["application/octet-stream"],
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"x-powered-by": ["elm-pages"],
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...headers,
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},
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statusCode,
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};
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} else if (renderResult.kind === "api-response") {
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return {
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body: renderResult.body,
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multiValueHeaders: headers,
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statusCode,
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isBase64Encoded: renderResult.isBase64Encoded,
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};
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} else {
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return {
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body: renderResult.body,
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multiValueHeaders: {
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"Content-Type": ["text/html"],
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"x-powered-by": ["elm-pages"],
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...headers,
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},
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statusCode,
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};
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}
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} catch (error) {
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console.error(error);
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console.error(JSON.stringify(error, null, 2));
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return {
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body: \`<body><h1>Error</h1><pre>\${JSON.stringify(error, null, 2)}</pre></body>\`,
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statusCode: 500,
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multiValueHeaders: {
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"Content-Type": ["text/html"],
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"x-powered-by": ["elm-pages"],
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},
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};
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}
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}
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/**
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* @param {import('aws-lambda').APIGatewayProxyEvent} req
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* @returns {{method: string; rawUrl: string; body: string?; headers: Record<string, string>; multiPartFormData: unknown }}
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*/
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function reqToJson(req) {
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return {
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requestTime: Math.round(new Date().getTime()),
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method: req.httpMethod,
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headers: req.headers,
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rawUrl: req.rawUrl,
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body: req.body || null,
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multiPartFormData: null,
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};
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}
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`;
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}
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/**
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* @param {fs.PathLike} dirpath
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*/
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function ensureDirSync(dirpath) {
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try {
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fs.mkdirSync(dirpath, { recursive: true });
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} catch (err) {
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if (err.code !== "EEXIST") throw err;
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}
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}
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/** @typedef {{kind: 'dynamic'} | {kind: 'literal', value: string}} ApiSegment */
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/**
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* @param {ApiSegment[]} pathPattern
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*/
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function apiPatternToRedirectPattern(pathPattern) {
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return (
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"/" +
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pathPattern
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.map((segment, index) => {
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switch (segment.kind) {
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case "literal": {
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return segment.value;
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}
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case "dynamic": {
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return `:dynamic${index}`;
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}
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default: {
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throw "Unhandled segment: " + JSON.stringify(segment);
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}
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}
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})
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.join("/")
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);
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}
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