Docs: Recipe for Contentful data source

docs/docs/recipes.md

@@ -985,6 +985,136 @@ export const pageQuery = graphql`
 - [Guide to creating pages from data programmatically](/docs/programmatically-create-pages-from-data/)
 - [Example repo](https://github.com/gatsbyjs/gatsby/tree/master/examples/recipe-sourcing-markdown) for this recipe
 
+### Sourcing data from Contentful
+
+#### Prerequisites
+
+- A [Gatsby site](/docs/quick-start/)
+- A [Contentful account](https://www.contentful.com/)
+- The [Contentful CLI](https://www.npmjs.com/package/contentful-cli) installed
+
+#### Directions
+
+1. Log in to Contentful with the CLI and follow the steps. It will help you create an account if you don't have one.
+
+```shell
+contentful login
+```
+
+2. Create a new space if you don't already have one. Make sure to save the space ID given to you at the end of the command. If you already have a Contentful space and space ID, you can skip steps 2 and 3.
+
+Note: for new accounts, you can overwrite the default onboarding space. Check to see the [spaces included with your account](https://app.contentful.com/account/profile/space_memberships).
+
+```shell
+contentful space create --name 'Gatsby example'
+```
+
+3. Seed the new space with example blog content using the new space ID returned from the previous command, in place of `<space ID>`.
+
+```shell
+contentful space seed -s '<space ID>' -t blog
+```
+
+For example, with a space ID in place: `contentful space seed -s '22fzx88spbp7' -t blog`
+
+4. Create a new access token for your space. Remember this token, as you will need it in step 6.
+
+```shell
+contentful space accesstoken create -s '<space ID>' --name 'Example token'
+```
+
+5. Install the `gatsby-source-contentful` plugin in your Gatsby site:
+
+```shell
+npm install --save gatsby-source-contentful
+```
+
+6. Edit the file `gatsby-config.js` and add the `gatsby-source-contentful` to the `plugins` array to enable the plugin. You should strongly consider using [environment variables](/docs/environment-variables/) to store your space ID and token for security purposes.
+
+```javascript:title=gatsby-config.js
+plugins: [
+   // add to array along with any other installed plugins
+   // highlight-start
+   {
+
+
+    resolve: `gatsby-source-contentful`,
+    options: {
+      spaceId: `<space ID>`, // or process.env.CONTENTFUL_SPACE_ID
+      accessToken: `<access token>`, // or process.env.CONTENTFUL_TOKEN
+    },
+  },
+  // highlight-end
+],
+```
+
+7. Run `gatsby develop` and make sure the site compiled successfully.
+
+8. Query data with the [GraphiQL editor](/docs/introducing-graphiql/) at `https://localhost:8000/___graphql`. The Contentful plugin adds several new node types to your site, including every content type in your Contentful website. Your example space with a "Blog Post" content type produces a `allContentfulBlogPost` node type in GraphQL.
+
+![the graphql interface, with a sample query outlined below](./images/recipe-sourcing-contentful-graphql.png)
+
+To query for Blog Post titles from Contentful, use the following GraphQL query:
+
+```graphql
+{
+  allContentfulBlogPost {
+    edges {
+      node {
+        title
+      }
+    }
+  }
+}
+```
+
+Contentful nodes also include several metadata fields like `createdAt` or `node_locale`.
+
+9. To show a list of links to the blog posts, create a new file in `/src/pages/blog.js`. This page will display all posts, sorted by updated date.
+
+```jsx:title=src/pages/blog.js
+import React from "react"
+import { graphql, Link } from "gatsby"
+
+const BlogPage = ({ data }) => (
+  <div>
+    <h1>Blog</h1>
+    <ul>
+      {data.allContentfulBlogPost.edges.map(({ node, index }) => (
+        <li key={index}>
+          <Link to={`/blog/${node.slug}`}>{node.title}</Link>
+        </li>
+      ))}
+    </ul>
+  </div>
+)
+
+export default BlogPage
+
+export const query = graphql`
+  {
+    allContentfulBlogPost(sort: { fields: [updatedAt] }) {
+      edges {
+        node {
+          title
+          slug
+        }
+      }
+    }
+  }
+`
+```
+
+To continue building out your Contentful site including post detail pages, check out the rest of the [Gatsby docs](/docs/sourcing-from-contentful/) and additional resources below.
+
+#### Additional resources
+
+- [Building a Site with React and Contentful](/blog/2018-1-25-building-a-site-with-react-and-contentful/)
+- [More on Sourcing from Contentful](/docs/sourcing-from-contentful/)
+- [Contentful source plugin](/packages/gatsby-source-contentful/)
+- [Long-text field types returned as objects](/packages/gatsby-source-contentful/#a-note-about-longtext-fields)
+- [Example repository for this recipe](https://github.com/gatsbyjs/gatsby/tree/master/examples/recipe-sourcing-contentful)
+
 ### Pulling data from an external source and creating pages without GraphQL
 
 You don't have to use the GraphQL data layer to include data in pages, [though there are reasons why you should consider GraphQL](/docs/why-gatsby-uses-graphql/). You can use the node `createPages` API to pull unstructured data directly into Gatsby sites rather than through GraphQL and source plugins.

examples/recipe-sourcing-contentful/README.md

@@ -0,0 +1,3 @@
+# Sourcing data from Contentful recipe example
+
+This repo is an example Gatsby site that shows how to source data from Contentful. To get started, [follow the Gatsby recipe to create a sample Contentful space](https://www.gatsbyjs.org/docs/recipes/#sourcing-data-from-contentful).

examples/recipe-sourcing-contentful/gatsby-config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  siteMetadata: {
+    title: `Gatsby Contentful Recipe`,
+    description: `Example Gatsby site sourcing data from Contentful.`,
+    author: `@gatsbyjs`,
+  },
+  plugins: [
+    {
+      resolve: `gatsby-source-contentful`,
+      options: {
+        spaceId: `[space ID]`, // or process.env.CONTENTFUL_SPACE_ID
+        accessToken: `[access token]`, // or process.env.CONTENTFUL_TOKEN
+      },
+    },
+    `gatsby-transformer-remark`,
+  ],
+}

examples/recipe-sourcing-contentful/gatsby-node.js

@@ -0,0 +1,30 @@
+const path = require(`path`)
+
+exports.createPages = async ({ graphql, actions }) => {
+  const { createPage } = actions
+  const result = await graphql(`
+    query {
+      allContentfulBlogPost {
+        edges {
+          node {
+            slug
+            title
+            childContentfulBlogPostBodyTextNode {
+              childMarkdownRemark {
+                html
+              }
+            }
+          }
+        }
+      }
+    }
+  `)
+
+  result.data.allContentfulBlogPost.edges.forEach(({ node }) => {
+    createPage({
+      path: `blog/${node.slug}`,
+      component: path.resolve(`./src/templates/blog-post.js`),
+      context: node,
+    })
+  })
+}

examples/recipe-sourcing-contentful/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "gatsby-recipe-sourcing-contentful",
+  "private": true,
+  "description": "A simple starter to get up and developing quickly with Gatsby",
+  "version": "0.1.0",
+  "author": "@gatsbyjs",
+  "dependencies": {
+    "gatsby": "^2.15.14",
+    "gatsby-image": "^2.2.18",
+    "gatsby-plugin-offline": "^2.2.10",
+    "gatsby-source-contentful": "^2.1.35",
+    "gatsby-transformer-remark": "^2.6.22",
+    "prop-types": "^15.7.2",
+    "react": "^16.9.0",
+    "react-dom": "^16.9.0"
+  },
+  "devDependencies": {
+    "prettier": "^1.18.2"
+  },
+  "keywords": [
+    "gatsby"
+  ],
+  "license": "MIT",
+  "scripts": {
+    "build": "gatsby build",
+    "develop": "gatsby develop",
+    "format": "prettier --write \"**/*.{js,jsx,json,md}\"",
+    "start": "npm run develop",
+    "serve": "gatsby serve",
+    "test": "echo \"Write tests! -> https://gatsby.dev/unit-testing \""
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/gatsbyjs/gatsby-starter-default"
+  },
+  "bugs": {
+    "url": "https://github.com/gatsbyjs/gatsby/issues"
+  }
+}

examples/recipe-sourcing-contentful/src/components/header.js

@@ -0,0 +1,42 @@
+import { Link } from "gatsby"
+import PropTypes from "prop-types"
+import React from "react"
+
+const Header = ({ siteTitle }) => (
+  <header
+    style={{
+      background: `rebeccapurple`,
+      marginBottom: `1.45rem`,
+    }}
+  >
+    <div
+      style={{
+        margin: `0 auto`,
+        maxWidth: 960,
+        padding: `1.45rem 1.0875rem`,
+      }}
+    >
+      <h1 style={{ margin: 0 }}>
+        <Link
+          to="/"
+          style={{
+            color: `white`,
+            textDecoration: `none`,
+          }}
+        >
+          {siteTitle}
+        </Link>
+      </h1>
+    </div>
+  </header>
+)
+
+Header.propTypes = {
+  siteTitle: PropTypes.string,
+}
+
+Header.defaultProps = {
+  siteTitle: ``,
+}
+
+export default Header