Fixes liferay#1180 - Add gatsby-plugin-meta-redirect to generate html…

… files for redirect

clayui.com/gatsby-config.js

@@ -2,27 +2,27 @@ const clay = require('clay-css');
 const path = require('path');
 
 module.exports = {
-    plugins: [
-        'gatsby-plugin-react-next',
-        'gatsby-transformer-try-examples',
-        {
-            resolve: 'gatsby-plugin-sass',
-            options: {
-                precision: 8,
-                includePaths: clay
-                    .includePaths
-                    .concat(
-                        path.join(
-                            clay.includePaths[0],
-                            'node_modules'
-                        )
-                    )
-            },
-        },
-        {
-            resolve: 'gatsby-source-filesystem',
-            options: {
-				name: "packages",
+	plugins: [
+		'gatsby-plugin-meta-redirect',
+		'gatsby-transformer-try-examples',
+		{
+			resolve: 'gatsby-plugin-sass',
+			options: {
+				precision: 8,
+				includePaths: clay
+					.includePaths
+					.concat(
+						path.join(
+							clay.includePaths[0],
+							'node_modules'
+						)
+					),
+			},
+		},
+		{
+			resolve: 'gatsby-source-filesystem',
+			options: {
+				name: 'packages',
 				path: `${__dirname}/content`,
 			},
         },

clayui.com/plugins/gatsby-plugin-meta-redirect/gatsby-node.js

@@ -0,0 +1,50 @@
+const path = require('path');
+const {exists, writeFile, ensureDir} = require('fs-extra');
+
+const getMetaRedirect = require('./getMetaRedirect');
+
+// Adapted from https://github.com/getchalk/gatsby-plugin-meta-redirect
+async function writeRedirectsFile(redirects, folder, pathPrefix) {
+	if (!redirects.length) return;
+
+	for (const redirect of redirects) {
+		const {fromPath, toPath} = redirect;
+
+		if (fromPath.endsWith('index.html')) continue;
+
+		const FILE_PATH = path.join(
+			folder,
+			fromPath.replace(pathPrefix, ''),
+			'index.html'
+		);
+
+		let fileExists;
+
+		try {
+			fileExists = await exists(FILE_PATH);
+		} catch (err) {}
+
+		if (!fileExists) {
+			try {
+				await ensureDir(path.dirname(FILE_PATH));
+			} catch (err) {
+				// ignore if the directory already exists;
+			}
+
+			const data = getMetaRedirect(toPath);
+			await writeFile(FILE_PATH, data);
+		}
+	}
+}
+
+exports.onPostBuild = ({store}) => {
+	const {redirects, program, config} = store.getState();
+
+	let pathPrefix = '';
+	if (program.prefixPaths) {
+		pathPrefix = config.pathPrefix;
+	}
+
+	const folder = path.join(program.directory, 'public');
+	return writeRedirectsFile(redirects, folder, pathPrefix);
+};

clayui.com/plugins/gatsby-plugin-meta-redirect/getMetaRedirect.js

@@ -0,0 +1,18 @@
+module.exports = function getMetaRedirect(toPath) {
+	let url = toPath.trim();
+
+	const hasProtocol = url.includes('://');
+	if (!hasProtocol) {
+		const hasLeadingSlash = url.startsWith('/');
+		if (!hasLeadingSlash) {
+			url = `/${url}`;
+		}
+
+		const resemblesFile = url.includes('.');
+		if (!resemblesFile) {
+			url = `${url}/`.replace(/\/\/+/g, '/');
+		}
+	}
+
+	return `<meta http-equiv="refresh" content="0; URL='${url}'" />`;
+};

clayui.com/plugins/gatsby-plugin-meta-redirect/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "gatsby-plugin-meta-redirect",
+  "version": "0.0.1"
+}