Release gatsby plugin gatsby cloud for Gatsby v2 (#29738)

* Add gatsby-plugin-gatsby-cloud

* Fix babel-preset-gatsby-package version

* Update engines

packages/gatsby-plugin-gatsby-cloud/.babelrc

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+{
+  "presets": [["babel-preset-gatsby-package"]]
+}

packages/gatsby-plugin-gatsby-cloud/.gitignore

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+yarn.lock
+/*.js

packages/gatsby-plugin-gatsby-cloud/.npmignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules
+*.un~
+yarn.lock
+src
+flow-typed
+coverage
+decls
+examples

packages/gatsby-plugin-gatsby-cloud/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+# 1.1.0-next.2 (2021-02-19)
+
+**Note:** Version bump only for package gatsby-plugin-gatsby-cloud

packages/gatsby-plugin-gatsby-cloud/README.md

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+# gatsby-plugin-gatsby-cloud
+
+Automatically generates a `_headers.json` file and a `_redirects.json` file at the root of the public folder to configure
+Headers and Redirects on Gatsby Cloud
+
+By default, the plugin will add some basic security headers. You can easily add or replace headers through the plugin config.
+
+## Install
+
+`npm install --save gatsby-plugin-gatsby-cloud`
+
+## How to use
+
+```javascript
+// In your gatsby-config.js
+plugins: [`gatsby-plugin-gatsby-cloud`]
+```
+
+## Configuration
+
+If you just need the critical assets, you don't need to add any additional
+config. However, if you want to add headers, remove default headers, or
+transform the given headers, you can use the following configuration options.
+
+```javascript
+plugins: [
+  {
+    resolve: `gatsby-plugin-gatsby-cloud`,
+    options: {
+      headers: {}, // option to add more headers. `Link` headers are transformed by the below criteria
+      allPageHeaders: [], // option to add headers for all pages. `Link` headers are transformed by the below criteria
+      mergeSecurityHeaders: true, // boolean to turn off the default security headers
+      mergeLinkHeaders: true, // boolean to turn off the default gatsby js headers
+      mergeCachingHeaders: true, // boolean to turn off the default caching headers
+      transformHeaders: (headers, path) => headers, // optional transform for manipulating headers under each path (e.g.sorting), etc.
+      generateMatchPathRewrites: true, // boolean to turn off automatic creation of redirect rules for client only paths
+    },
+  },
+]
+```
+
+### Headers
+
+You should pass in an object with string keys (representing the paths) and an
+array of strings for each header.
+
+An example:
+
+```javascript
+{
+  options: {
+    headers: {
+      "/*": [
+        "Basic-Auth: someuser:somepassword anotheruser:anotherpassword",
+      ],
+      "/my-page": [
+        // matching headers (by type) are replaced by Gatsby Cloud with more specific routes
+        "Basic-Auth: differentuser:differentpassword",
+      ],
+    },
+  }
+}
+```
+
+Link paths are specially handled by this plugin. Since most files are processed
+and cache-busted through Gatsby (with a file hash), the plugin will transform
+any base file names to the hashed variants. If the file is not hashed, it will
+ensure the path is valid relative to the output `public` folder. You should be
+able to reference assets imported through javascript in the `static` folder.
+
+Do not specify the public path in the config, as the plugin will provide it for
+you.
+
+The `_headers.json` file does not inherit headers, and it will replace any
+matching headers it finds in more specific routes. For example, if you add a
+link to the root wildcard path (`/*`), it will be replaced by any more
+specific path. If you want a resource to put linked across the site, you will
+have to add to every path. To make this easier, the plugin provides the
+`allPageHeaders` option to inject the same headers on every path.
+
+```javascript
+{
+  options: {
+    allPageHeaders: [
+      "Link: </static/my-logo.png>; rel=preload; as=image",
+    ],
+    headers: {
+      "/*": [
+        "Basic-Auth: someuser:somepassword anotheruser:anotherpassword",
+      ],
+    },
+  }
+}
+```
+
+### Redirects
+
+You can create redirects using the [`createRedirect`](https://www.gatsbyjs.org/docs/actions/#createRedirect) action.
+
+In addition to the options provided by the Gatsby API, you can pass these options specific to this plugin:
+
+| Attribute    | Description                                                                                                                                                                                                                                              |
+| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `statusCode` | Overrides the HTTP status code which is set to `302` by default or `301` when [`isPermanent`](https://www.gatsbyjs.org/docs/actions/#createRedirect) is `true`. You can set one here. For example, `200` for rewrites, or `404` for a custom error page. |
+
+An example:
+
+```javascript
+createRedirect({ fromPath: "/old-url", toPath: "/new-url", isPermanent: true })
+createRedirect({ fromPath: "/url", toPath: "/zn-CH/url", Language: "zn" })
+createRedirect({
+  fromPath: "/url_that_is/not_pretty",
+  toPath: "/pretty/url",
+  statusCode: 200,
+})
+createRedirect({
+  fromPath: "/packages/*",
+  toPath: "/plugins/*",
+})
+```
+
+Redirect rules are automatically added for [client only paths](https://www.gatsbyjs.org/docs/client-only-routes-and-user-authentication). The plugin uses the [matchPath](https://www.gatsbyjs.org/docs/gatsby-internals-terminology/#matchpath) syntax to match all possible requests in the range of your client-side routes and serves the HTML file for the client-side route. Without it, only the exact route of the client-side route works.
+
+If those rules are conflicting with custom rules or if you want to have more control over them you can disable them in [configuration](#configuration) by setting `generateMatchPathRewrites` to `false`.
+
+An asterix, `*`, will match anything that follows. i.e. `/packages/gatsby-plugin-gatsby-cloud/` will be redirected to `/plugins/gatsby-plugin-gatsby-cloud/`.
+
+### HTTP Strict Transport Security
+
+[HSTS Cheatsheet](https://cheatsheetseries.owasp.org/cheatsheets/HTTP_Strict_Transport_Security_Cheat_Sheet.html)
+
+Since this header is an opt-in security enhancement with permanent consequences we don't include it as a default feature but use can use the `allPagesHeaders` to include it.
+
+```javascript
+{
+  options: {
+    allPageHeaders: [
+      "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload",
+    ],
+  }
+}
+```

packages/gatsby-plugin-gatsby-cloud/package.json

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+{
+  "name": "gatsby-plugin-gatsby-cloud",
+  "description": "A Gatsby plugin which optimizes working with Gatsby Cloud",
+  "version": "1.0.1",
+  "author": "Kyle Mathews <mathews.kyle@gmail.com>",
+  "bugs": {
+    "url": "https://github.com/gatsbyjs/gatsby/issues"
+  },
+  "dependencies": {
+    "@babel/runtime": "^7.12.5",
+    "fs-extra": "^8.1.0",
+    "kebab-hash": "^0.1.2",
+    "lodash": "^4.17.20",
+    "webpack-assets-manifest": "^3.1.1"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.12.1",
+    "@babel/core": "^7.12.3",
+    "babel-preset-gatsby-package": "^0.12.0",
+    "cross-env": "^7.0.3"
+  },
+  "homepage": "https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-plugin-gatsby-cloud#readme",
+  "keywords": [
+    "gatsby",
+    "gatsby-plugin",
+    "http/2-server-push",
+    "gatsby-cloud"
+  ],
+  "license": "MIT",
+  "main": "index.js",
+  "peerDependencies": {
+    "gatsby": "^2.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/gatsbyjs/gatsby.git",
+    "directory": "packages/gatsby-plugin-gatsby-cloud"
+  },
+  "scripts": {
+    "build": "babel src --out-dir . --ignore \"**/__tests__\"",
+    "prepare": "cross-env NODE_ENV=production npm run build",
+    "watch": "babel -w src --out-dir . --ignore \"**/__tests__\""
+  },
+  "engines": {
+    "node": ">=10.13.0"
+  }
+}

packages/gatsby-plugin-gatsby-cloud/src/__tests__/__snapshots__/create-redirects.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`create-redirects should assemble a redirects file 1`] = `"{\\"redirects\\":[{\\"fromPath\\":\\"/old-url\\",\\"toPath\\":\\"/new-url\\",\\"isPermanent\\":true},{\\"fromPath\\":\\"/url_that_is/not_pretty\\",\\"toPath\\":\\"/pretty/url\\",\\"statusCode\\":201}],\\"rewrites\\":[{\\"fromPath\\":\\"/url_that_is/ugly\\",\\"toPath\\":\\"/not_ugly/url\\"},{\\"fromPath\\":\\"/path2/*splatparam\\",\\"toPath\\":\\"/path2/[...splatparam]/\\"},{\\"fromPath\\":\\"/path/*\\",\\"toPath\\":\\"/path/[...]/\\"},{\\"fromPath\\":\\"/path3/:level1/:level2\\",\\"toPath\\":\\"/path3/[level1]/[level2]/\\"},{\\"fromPath\\":\\"/path4/:param1\\",\\"toPath\\":\\"/path4/[param1]/\\"}]}"`;