docs,website: tutorial on adding custom providers (#2310)

* docs,website: first draft of tutorial on adding custom providers

* docs: define "Provider Plugins"

* blog,docs: revise Provider summary

* docs: use consistent sample comments

* blog, examples: use svg code directly as custom provider icon

examples/custom-provider/babel.config.js

@@ -0,0 +1,14 @@
+module.exports = (api) => {
+  api.env('test')
+  return {
+    presets: [
+      ['@babel/preset-env', {
+        modules: false,
+        loose: true
+      }]
+    ],
+    plugins: [
+      ['@babel/plugin-transform-react-jsx', { pragma: 'h' }]
+    ].filter(Boolean)
+  }
+}

examples/custom-provider/client/MyCustomProvider.js

@@ -10,20 +10,22 @@ module.exports = class MyCustomProvider extends Plugin {
     this.id = this.opts.id || 'MyCustomProvider'
     Provider.initPlugin(this, opts)
 
-    this.title = 'MyCustomProvider'
+    this.title = 'MyUnsplash'
     this.icon = () => (
-      <img src="https://uppy.io/images/logos/uppy-dog-head-arrow.svg" width="23" />
+      <svg width="32" height="32" xmlns="http://www.w3.org/2000/svg">
+        <path d="M10 9V0h12v9H10zm12 5h10v18H0V14h10v9h12v-9z" fill="#000000" fill-rule="nonzero" />
+      </svg>
     )
 
-    // writing out the key explicitly for readability the key used to store
-    // the provider instance must be equal to this.id.
-    this[this.id] = new Provider(uppy, {
+    this.provider = new Provider(uppy, {
       companionUrl: this.opts.companionUrl,
-      provider: 'mycustomprovider'
+      companionHeaders: this.opts.companionHeaders || this.opts.serverHeaders,
+      provider: 'myunsplash',
+      pluginId: this.id
     })
 
     this.files = []
-    this.onAuth = this.onAuth.bind(this)
+    this.onFirstRender = this.onFirstRender.bind(this)
     this.render = this.render.bind(this)
 
     // merge default options with the ones set by user
@@ -31,7 +33,9 @@ module.exports = class MyCustomProvider extends Plugin {
   }
 
   install () {
-    this.view = new ProviderViews(this)
+    this.view = new ProviderViews(this, {
+      provider: this.provider
+    })
     // Set default state
     this.setPluginState({
       authenticated: false,
@@ -54,56 +58,8 @@ module.exports = class MyCustomProvider extends Plugin {
     this.unmount()
   }
 
-  onAuth (authenticated) {
-    this.setPluginState({ authenticated })
-    if (authenticated) {
-      this.view.getFolder()
-    }
-  }
-
-  isFolder (item) {
-    return false
-  }
-
-  getItemData (item) {
-    return item
-  }
-
-  getItemIcon (item) {
-    return 'https://uppy.io/images/logos/uppy-dog-head-arrow.svg'
-  }
-
-  getItemSubList (item) {
-    return item.entries
-  }
-
-  getItemName (item) {
-    return item.name
-  }
-
-  getMimeType (item) {
-    // mime types aren't supported.
-    return null
-  }
-
-  getItemId (item) {
-    return item.name
-  }
-
-  getItemRequestPath (item) {
-    return encodeURIComponent(item.name)
-  }
-
-  getItemModifiedDate (item) {
-    return Date.now()
-  }
-
-  getItemThumbnailUrl (item) {
-    return 'https://uppy.io/images/logos/uppy-dog-head-arrow.svg'
-  }
-
-  getUsername () {
-    return 'Cool Dog'
+  onFirstRender () {
+    return this.view.getFolder()
   }
 
   render (state) {

examples/custom-provider/package-lock.json

@@ -0,0 +1,3954 @@
+{
+  "name": "@uppy-example/custom-provider",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
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+      "requires": {
+        "@babel/highlight": "^7.10.1"
+      }
+    },
+    "@babel/core": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.9.0.tgz",
+      "integrity": "sha512-kWc7L0fw1xwvI0zi8OKVBuxRVefwGOrKSQMvrQ3dW+bIIavBY3/NpXmpjMy7bQnLgwgzWQZ8TlM57YHpHNHz4w==",
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.9.0",
+        "@babel/helper-module-transforms": "^7.9.0",
+        "@babel/helpers": "^7.9.0",
+        "@babel/parser": "^7.9.0",
+        "@babel/template": "^7.8.6",
+        "@babel/traverse": "^7.9.0",
+        "@babel/types": "^7.9.0",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.2",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.10.2",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.10.2.tgz",
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+      "requires": {
+        "@babel/types": "^7.10.2",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-function-name": {
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+        "browserify": "^16.1.0",
+        "chokidar": "^2.1.1",
+        "defined": "^1.0.0",
+        "outpipe": "^1.1.0",
+        "through2": "^2.0.0",
+        "xtend": "^4.0.0"
+      }
+    },
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+        "concat-stream": "^1.5.0",
+        "debounce": "^1.0.0",
+        "events": "^1.0.2",
+        "object-assign": "^4.0.1",
+        "strip-ansi": "^3.0.0",
+        "watchify": "^3.11.1"
+      }
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+      "requires": {
+        "isexe": "^2.0.0"
+      }
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
+    }
+  }
+}

examples/custom-provider/server/customprovider.js

@@ -1,41 +1,105 @@
-const fs = require('fs')
-const path = require('path')
-const DUMM_FILE = path.join(__dirname, 'fixtures/image.jpg')
+const request = require('request')
+const BASE_URL = 'https://api.unsplash.com'
 
 /**
  * an example of a custom provider module. It implements @uppy/companion's Provider interface
  */
 class MyCustomProvider {
   constructor (options) {
-    this.authProvider = MyCustomProvider.authProvider
+    this.authProvider = 'myunsplash'
   }
 
-  static get authProvider () {
-    return 'mycustomprovider'
-  }
-
-  list (options, done) {
-    const response = {
-      body: {
-        entries: [
-          { name: 'file1.jpg' },
-          { name: 'file2.jpg' },
-          { name: 'file3.jpg' }
-        ]
+  list ({ token, directory }, done) {
+    const path = directory ? `/${directory}/photos` : ''
+    const options = {
+      url: `${BASE_URL}/collections${path}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
       }
     }
-    return done(null, response, response.body)
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        done(err)
+        return
+      }
+
+      done(null, this._adaptData(body))
+    })
   }
 
   download ({ id, token }, onData) {
-    return fs.readFile(DUMM_FILE, (err, data) => {
-      if (err) console.error(err)
-      onData(data)
+    const options = {
+      url: `${BASE_URL}/photos/${id}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    }
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        return
+      }
+
+      const url = body.links.download
+      request.get(url)
+        .on('data', (chunk) => onData(null, chunk))
+        .on('end', () => onData(null, null))
+        .on('error', (err) => console.log(err))
     })
   }
 
   size ({ id, token }, done) {
-    return done(fs.statSync(DUMM_FILE).size)
+    const options = {
+      url: `${BASE_URL}/photos/${id}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    }
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        done(err)
+        return
+      }
+
+      done(null, body.width * body.height)
+    })
+  }
+
+  _adaptData (res) {
+    const data = {
+      username: null,
+      items: [],
+      nextPagePath: null
+    }
+
+    const items = res
+    items.forEach((item) => {
+      const isFolder = !!item.published_at
+      data.items.push({
+        isFolder: isFolder,
+        icon: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+        name: item.title || item.description,
+        mimeType: isFolder ? null : 'image/jpeg',
+        id: item.id,
+        thumbnail: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+        requestPath: item.id,
+        modifiedDate: item.updated_at,
+        size: null
+      })
+    })
+
+    return data
   }
 }
 

examples/custom-provider/server/index.js

@@ -33,6 +33,10 @@ app.get('/', (req, res) => {
   res.send('Welcome to my uppy companion service')
 })
 
+// source https://unsplash.com/documentation#user-authentication
+const AUTHORIZE_URL = 'https://unsplash.com/oauth/authorize'
+const ACCESS_URL = 'https://unsplash.com/oauth/token'
+
 // initialize uppy
 const uppyOptions = {
   providerOptions: {
@@ -42,15 +46,16 @@ const uppyOptions = {
     }
   },
   customProviders: {
-    mycustomprovider: {
+    myunsplash: {
       config: {
         // your oauth handlers
-        authorize_url: 'http://localhost:3020/oauth/authorize',
-        access_url: 'http://localhost:3020/oauth/token',
+        authorize_url: AUTHORIZE_URL,
+        access_url: ACCESS_URL,
         oauth: 2,
-        key: '***',
-        secret: '**',
-        scope: ['read', 'write']
+        key: 'your unsplash key here',
+        secret: 'your unsplash secret here',
+        callback: '/myunsplash/callback',
+        transport: 'session'
       },
       // you provider module
       module: require('./customprovider')
@@ -65,12 +70,6 @@ const uppyOptions = {
   debug: true
 }
 
-app.get('/oauth/authorize', (req, res) => {
-  // skips the default oauth process.
-  // ideally this endpoint should handle the actual oauth process
-  res.redirect(`http://localhost:3020/mycustomprovider/callback?state=${req.query.state}&access_token=randombytes`)
-})
-
 app.use(uppy.app(uppyOptions))
 
 // handle 404

packages/@uppy/provider-views/README.md

@@ -22,6 +22,10 @@ class GoogleDrive extends Plugin {
     // snip
   }
 
+  onFirstRender () {
+    return this.view.getFolder('root', '/')
+  }
+
   render (state) {
     return this.view.render(state)
   }

packages/@uppy/provider-views/types/index.d.ts

@@ -0,0 +1,22 @@
+import CompanionClient = require('@uppy/companion-client')
+import Uppy = require('@uppy/core')
+
+interface ProviderViewOptions {
+    provider: CompanionClient.Provider
+    viewType?: 'list' | 'grid'
+    showTitles?: boolean
+    showFilter?: boolean
+    showBreadcrumbs?: boolean
+}
+
+interface OnFirstRenderer {
+    onFirstRender: () => any
+}
+
+
+declare class ProviderView {
+    constructor (plugin: Uppy.Plugin & OnFirstRenderer, opts: ProviderViewOptions)
+    // @todo add other provider view methods
+}
+
+export = ProviderView

website/src/_posts/2020-03-custom-providers.md

@@ -0,0 +1,575 @@
+---
+title: "Adding Custom Providers: Step by Step Tutorial to add Custom Providers"
+date: 2020-06-08
+author: ife
+published: false
+---
+
+In this post we will be going through a step by step tutorial on how to develop, and add custom [providers](https://uppy.io/docs/providers/) to Uppy and Companion. For the purpose of this tutorial we will be building a custom provider for [Unsplash](https://unsplash.com/).
+
+<!--more-->
+
+## What are Provider Plugins?
+
+> Provider Plugins help you connect to your accounts with remote file storage providers such as Dropbox, Google Drive, Instagram and remote URLs.
+>
+> They work tightly with [Companion](https://www.npmjs.com/package/@uppy/companion) — Uppy's server-to-server communication handler between your server and file storage providers.
+
+Read more on [Provider Plugins](https://uppy.io/docs/providers/).
+
+
+Creating a custom provider composes of two parts; **Custom Companion Provider** and **Custom Uppy Plugin**
+
+## Creating a Custom Companion Provider
+
+On the Companion side, we need to create a Provider that receives the provider related requests that would come from Uppy.
+
+### Setting up Companion
+
+We'll start off by setting up a minimal express server.
+
+1. Create a folder named "custom-provider" and navigate into it
+
+```sh
+mkdir custom-provider
+cd custom-provider
+```
+2. Run `npm init` to setup your `package.json` file
+3. install express, express-session, body-parser, request, uppy and @uppy/companion
+
+```sh
+npm i -S express express-session body-parser request @uppy/companion uppy
+```
+
+with all that done, my package.json file looks something like this:
+
+```json
+{
+  "name": "custom-provider",
+  "dependencies": {
+    "body-parser": "^1.18.2",
+    "express": "^4.16.2",
+    "express-session": "^1.15.6",
+    "request": "^2.88.0",
+    "uppy": "^1.14.1",
+    "@uppy/companion": "^2.0.0"
+  },
+  "private": true,
+  "scripts": {}
+}
+```
+
+4. Create a `server/index.js` file within the project and add initiate your express server
+
+```js
+const express = require('express')
+const companion = require('@uppy/companion')
+const bodyParser = require('body-parser')
+const session = require('express-session')
+
+const app = express()
+
+app.use(bodyParser.json())
+app.use(session({
+  secret: 'some-secret',
+  resave: true,
+  saveUninitialized: true
+}))
+
+app.use((req, res, next) => {
+  res.setHeader('Access-Control-Allow-Origin', req.headers.origin || '*')
+  res.setHeader(
+    'Access-Control-Allow-Methods',
+    'GET, POST, OPTIONS, PUT, PATCH, DELETE'
+  )
+  res.setHeader(
+    'Access-Control-Allow-Headers',
+    'Authorization, Origin, Content-Type, Accept'
+  )
+  next()
+})
+
+// initialize uppy
+const companionOptions = {
+  providerOptions: {
+    dropbox: {
+      key: 'your Dropbox key',
+      secret: 'your Dropbox secret'
+    }
+  },
+  server: {
+    host: 'localhost:3020',
+    protocol: 'http'
+  },
+  filePath: './output',
+  secret: 'some-secret',
+  debug: true
+}
+
+app.use(companion.app(companionOptions))
+
+// handle 404
+app.use((req, res, next) => {
+  return res.status(404).json({ message: 'Not Found' })
+})
+
+companion.socket(app.listen(3020), companionOptions)
+
+console.log('Welcome to Companion!')
+console.log(`Listening on http://0.0.0.0:3020`)
+
+```
+
+The code snippet above sets up an express server and plugs Companion into it. However, the Companion setup doesn't include a custom provider yet. It only includes the Dropbox provider.
+
+To be sure everything is working correctly so far, you can start the server by running:
+
+`node server/index.js`
+
+It should log the following message in the console:
+
+```sh
+Welcome to Companion!
+Listening on http://0.0.0.0:3020
+```
+
+Now we need to proceed to add our custom provider.
+
+### Setting up Unsplash API
+
+Head to Unsplash's [developer platform](https://unsplash.com/oauth/applications) (you'd need to create an account if you don't already have one).
+
+Click "New Application" to create a new application. For the sake of this tutorial, I am naming my application "companion-provider". Once it is created, your page should look something like this:
+
+![](/images/blog/custom-providers/unsplash-api-dashboard.png)
+
+### Writing the custom provider
+
+Back to our project directory, we are going to create a `server/customprovider.js` file. This will contain the code that implements the Unsplash provider.
+
+According to [the docs](https://uppy.io/docs/companion/#Adding-custom-providers), we need to create a class that implements the methods `list`, `download`, and `size`.
+
+The constructor of our class will look something like this:
+
+```js
+class MyCustomProvider {
+  constructor (options) {
+    this.authProvider = 'myunsplash' // the name of our provider (lowercased)
+  }
+  ...
+}
+```
+
+Our `list` method would look something like this
+
+```js
+list ({ token, directory }, done) {
+  const path = directory ? `/${directory}/photos` : ''
+  const options = {
+    url: `${BASE_URL}/collections${path}`,
+    method: 'GET',
+    json: true,
+    headers: {
+      Authorization: `Bearer ${token}`
+    }
+  }
+
+  request(options, (err, resp, body) => {
+    if (err) {
+      console.log(err)
+      done(err)
+      return
+    }
+
+    done(null, this._adaptData(body))
+  })
+}
+
+_adaptData (res) {
+  const data = {
+    username: null,
+    items: [],
+    nextPagePath: null
+  }
+
+  const items = res
+  items.forEach((item) => {
+    const isFolder = !!item.published_at
+    data.items.push({
+      isFolder: isFolder,
+      icon: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+      name: item.title || item.description,
+      mimeType: isFolder ? null : 'image/jpeg',
+      id: item.id,
+      thumbnail: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+      requestPath: item.id,
+      modifiedDate: item.updated_at,
+      size: null
+    })
+  })
+
+  return data
+}
+```
+
+the method makes an http request to the unsplash API based on the documentation to [list collections](https://unsplash.com/documentation#list-collections) and [list collection's photos](https://unsplash.com/documentation#get-a-collections-photos). The `_adaptData` method exists to help us conform to [the list data](https://uppy.io/docs/companion/#list-data)
+
+Our `size` method will look something like this:
+
+```js
+size ({ id, token }, done) {
+  const options = {
+    url: `${BASE_URL}/photos/${id}`,
+    method: 'GET',
+    json: true,
+    headers: {
+      Authorization: `Bearer ${token}`
+    }
+  }
+
+  request(options, (err, resp, body) => {
+    if (err) {
+      console.log(err)
+      done(err)
+      return
+    }
+
+    done(null, body.width * body.height)
+  })
+}
+```
+
+Unsplash's API doesn't provide the file size, so we are estimating it by multiplying the width and height of the image.
+
+The `download` method will look like this:
+
+```js
+download ({ id, token }, onData) {
+  const options = {
+    url: `${BASE_URL}/photos/${id}`,
+    method: 'GET',
+    json: true,
+    headers: {
+      Authorization: `Bearer ${token}`
+    }
+  }
+
+  request(options, (err, resp, body) => {
+    if (err) {
+      console.log(err)
+      return
+    }
+
+    const url = body.links.download
+    request.get(url)
+      .on('data', (chunk) => onData(null, chunk))
+      .on('end', () => onData(null, null))
+      .on('error', (err) => console.log(err))
+  })
+}
+```
+With all of this put together the entire file would look something like this:
+
+```js
+const request = require('request')
+const BASE_URL = 'https://api.unsplash.com'
+
+class MyCustomProvider {
+  constructor (options) {
+    this.authProvider = 'myunsplash'
+  }
+
+  list ({ token, directory }, done) {
+    const path = directory ? `/${directory}/photos` : ''
+    const options = {
+      url: `${BASE_URL}/collections${path}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    }
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        done(err)
+        return
+      }
+
+      done(null, this._adaptData(body))
+    })
+  }
+
+  download ({ id, token }, onData) {
+    const options = {
+      url: `${BASE_URL}/photos/${id}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    }
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        return
+      }
+
+      const url = body.links.download
+      request.get(url)
+        .on('data', (chunk) => onData(null, chunk))
+        .on('end', () => onData(null, null))
+        .on('error', (err) => console.log(err))
+    })
+  }
+
+  size ({ id, token }, done) {
+    const options = {
+      url: `${BASE_URL}/photos/${id}`,
+      method: 'GET',
+      json: true,
+      headers: {
+        Authorization: `Bearer ${token}`
+      }
+    }
+
+    request(options, (err, resp, body) => {
+      if (err) {
+        console.log(err)
+        done(err)
+        return
+      }
+
+      done(null, body.width * body.height)
+    })
+  }
+
+  _adaptData (res) {
+    const data = {
+      username: null,
+      items: [],
+      nextPagePath: null
+    }
+
+    const items = res
+    items.forEach((item) => {
+      const isFolder = !!item.published_at
+      data.items.push({
+        isFolder: isFolder,
+        icon: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+        name: item.title || item.description,
+        mimeType: isFolder ? null : 'image/jpeg',
+        id: item.id,
+        thumbnail: isFolder ? item.cover_photo.urls.thumb : item.urls.thumb,
+        requestPath: item.id,
+        modifiedDate: item.updated_at,
+        size: null
+      })
+    })
+
+    return data
+  }
+}
+
+module.exports = MyCustomProvider
+```
+
+Now we can go back to `server/index.js` to enable our custom provider:
+
+```js
+// initialize uppy
+const uppyOptions = {
+  providerOptions: {
+    dropbox: {
+      key: 'your Dropbox key',
+      secret: 'your Dropbox secret'
+    }
+  },
+  customProviders: {
+    myunsplash: {
+      config: {
+        // source https://unsplash.com/documentation#user-authentication
+        authorize_url: 'https://unsplash.com/oauth/authorize',
+        access_url: 'https://unsplash.com/oauth/token',
+        oauth: 2,
+        key: 'YOUR UNSPLASH API KEY',
+        secret: 'YOUR UNSPLASH API SECRET',
+        callback: '/myunsplash/callback',
+        transport: 'session',
+      },
+      // you provider module
+      module: require('./customprovider')
+    }
+  },
+  server: {
+    host: 'localhost:3020',
+    protocol: 'http'
+  },
+  filePath: './output',
+  secret: 'some-secret',
+  debug: true
+}
+```
+
+You can find your unsplash API key on your Unsplash [app dashboard](https://unsplash.com/oauth/applications)
+
+## Creating a Custom Uppy Plugin
+
+Now we need to implement the client part of this. To do this we need to implement an Uppy Plugin.
+
+First, we'll create a `client/MyCustomProvider.js` file. Following the instructions [here](https://uppy.io/docs/writing-plugins/), our Uppy Plugin (aka `client/MyCustomProvider.js` file) could look something like this:
+
+```js
+const { Plugin } = require('@uppy/core')
+const { Provider } = require('@uppy/companion-client')
+const ProviderViews = require('@uppy/provider-views')
+const { h } = require('preact')
+
+module.exports = class MyCustomProvider extends Plugin {
+  constructor (uppy, opts) {
+    super(uppy, opts)
+    this.type = 'acquirer'
+    this.id = this.opts.id || 'MyCustomProvider'
+    Provider.initPlugin(this, opts)
+
+    this.title = 'MyUnsplash'
+    this.icon = () => (
+      <svg width="32" height="32" xmlns="http://www.w3.org/2000/svg">
+        <path d="M10 9V0h12v9H10zm12 5h10v18H0V14h10v9h12v-9z" fill="#000000" fill-rule="nonzero" />
+      </svg>
+    )
+
+    this.provider = new Provider(uppy, {
+      companionUrl: this.opts.companionUrl,
+      companionHeaders: this.opts.companionHeaders || this.opts.serverHeaders,
+      provider: 'myunsplash',
+      pluginId: this.id
+    })
+
+    this.files = []
+    this.onFirstRender = this.onFirstRender.bind(this)
+    this.render = this.render.bind(this)
+
+    // merge default options with the ones set by user
+    this.opts = Object.assign({}, opts)
+  }
+
+  install () {
+    this.view = new ProviderViews(this, {
+      provider: this.provider
+    })
+    // Set default state
+    this.setPluginState({
+      authenticated: false,
+      files: [],
+      folders: [],
+      directories: [],
+      activeRow: -1,
+      filterInput: '',
+      isSearchVisible: false
+    })
+
+    const target = this.opts.target
+    if (target) {
+      this.mount(target, this)
+    }
+  }
+
+  uninstall () {
+    this.view.tearDown()
+    this.unmount()
+  }
+
+  onFirstRender () {
+    return this.view.getFolder()
+  }
+
+  render (state) {
+    return this.view.render(state)
+  }
+}
+```
+
+Asides from implementing the methods required by the Uppy Plugin, we are also implmeneting the method `onFirstRender`. This is because we are using the [@uppy/provider-views](https://www.npmjs.com/package/@uppy/provider-views) package to reuse its UI componenets. The [@uppy/provider-views](https://www.npmjs.com/package/@uppy/provider-views) package requires that our plugin implements an `onFirstRender` method.
+
+We are also pre-setting a default plugin with a default object structure which is used by the `@uppy/provider-views` package.
+
+With that done, we can now use our new plugin with Uppy. Create a file `client/main.js` and initiate Uppy in there like so:
+
+```js
+const Uppy = require('@uppy/core')
+const Dropbox = require('@uppy/dropbox')
+const Tus = require('@uppy/tus')
+const MyCustomProvider = require('./MyCustomProvider')
+const Dashboard = require('@uppy/dashboard')
+
+const uppy = Uppy({
+  debug: true
+})
+
+uppy.use(Dropbox, {
+  companionUrl: 'http://localhost:3020'
+})
+
+uppy.use(MyCustomProvider, {
+  companionUrl: 'http://localhost:3020'
+})
+
+uppy.use(Dashboard, {
+  inline: true,
+  target: 'body',
+  plugins: ['Dropbox', 'MyCustomProvider']
+})
+
+uppy.use(Tus, { endpoint: 'https://master.tus.io/files/' })
+```
+
+Now we need to bundle the file so it can be loaded on the browser. To do this, we'd install [budo](https://www.npmjs.com/package/budo):
+
+1. In the root project directory, run `npm install budo -g`.
+2. Create a `babel.config.js` file looking like so:
+
+```js
+module.exports = (api) => {
+  api.env('test')
+  return {
+    presets: [
+      ['@babel/preset-env', {
+        modules: false,
+        loose: true
+      }]
+    ],
+    plugins: [
+      ['@babel/plugin-transform-react-jsx', { pragma: 'h' }],
+    ].filter(Boolean)
+  }
+}
+```
+3. Add an `index.html` file (in the root of the project) that uses a bundle file like so:
+
+```html
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Uppy Custom provider Example</title>
+    <link href="https://transloadit.edgly.net/releases/uppy/v1.15.0/uppy.min.css" rel="stylesheet">
+  </head>
+  <body>
+    <script src="bundle.js"></script>
+  </body>
+</html>
+```
+
+4. Create the bundle file by running `budo client/main.js:bundle.js -- -t babelify`. This will bundle your `client` side work and have it running on a local server. Please check the console log to see on what port the server is running. As at the time of this writing, it defaults to `9966` (URL will be http://localhost:9966/).
+
+You can now load the URL of your client on your browser to see it running. When I run mine, it looks something like this:
+
+![](/images/blog/custom-providers/dashboard-preview.png)
+
+In order to use this with our Companion implementation, we need to also start our Companion server by running `node server/index.js`.
+
+Congrats! 🎉We have completed our custom plugin at this point. For an example source code on this tutorial, please see the [custom provider example](https://github.com/transloadit/uppy/tree/master/examples/custom-provider).

website/src/docs/companion.md

@@ -286,7 +286,7 @@ See [env.example.sh](https://github.com/transloadit/uppy/blob/master/env.example
 
 6. **sendSelfEndpoint(optional)** - This is basically the same as the `server.host + server.path` attributes. The major reason for this attribute is that, when set, it adds the value as the `i-am` header of every request response.
 
-7. **customProviders(optional)** - This option enables you to add custom providers along with the already supported providers. See [Adding Custom Providers](#Adding-Custom-Providers) for more information.
+7. **customProviders(optional)** - This option enables you to add custom providers along with the already supported providers. See [Adding Custom Providers](#Adding-custom-providers) for more information.
 
 8. **uploadUrls(optional)** - An array of URLs (full paths). If specified, Companion will only accept uploads to these URLs (useful when you want to make sure a Companion instance is only allowed to upload to your servers, for example).
 
@@ -359,7 +359,7 @@ We have [a detailed guide on running Companion in Kubernetes](https://github.com
 
 ### Adding custom providers
 
-As of now, Companion supports **Google Drive**, **Dropbox**, **Instagram**, and **URL** (remote urls) out of the box, but you may also choose to add your own custom providers. You can do this by passing the `customProviders` option when calling the Uppy `app` method. The custom provider is expected to support Oauth 1 or 2 for authentication/authorization.
+As of now, Companion supports the [providers listed here](https://uppy.io/docs/companion/#Supported-providers) out of the box, but you may also choose to add your own custom providers. You can do this by passing the `customProviders` option when calling the Uppy `app` method. The custom provider is expected to support Oauth 1 or 2 for authentication/authorization.
 
 ```javascript
 let options = {
@@ -371,6 +371,7 @@ let options = {
                 oauth: 2,
                 key: "***",
                 secret: "***",
+                callback: '/myprovidername/callback'
                 scope: ["read", "write"]
             },
             module: require('/path/to/provider/module')
@@ -390,13 +391,62 @@ To work well with Companion, the **Module** must be a class with the following m
     - token - authorization token (retrieved from oauth process) to send along with your request
     - directory - the `id/name` of the directory from which data is to be retrieved. This may be ignored if it doesn't apply to your provider
     - query - expressjs query params object received by the server (just in case there is some data you need in there).
-  - `done (err, response, body)` - the callback that should be called when the request to your provider is made. As the signature indicates, the following data should be passed along to the callback `err`, `response`, and `body`.
-2. `download (options, onData, onResponse)` - downloads a particular file from the provider.
+  - `done (err, data)` - the callback that should be called when the request to your provider is made. As the signature indicates, the following data should be passed along to the callback `err`, and [`data`]((#list-data)).
+2. `download (options, onData)` - downloads a particular file from the provider.
   - `options` - is an object containing the following attributes:
     - token - authorization token (retrieved from oauth process) to send along with your request.
     - id - ID of the file being downloaded.
-  - `onData (chunk)` - a callback that should be called with each data chunk received on download. This is useful if the size of the downloaded file can be pre-determined. This would allow for pipelined upload of the file (to the desired destination), while the download is still going on.
-  - `onResponse (response)` - if the size of the downloaded file can not be pre-determined by Companion, then this callback should be called in place of the `onData` callback. This callback would be called after the download is done, and would take the downloaded data (response) as the argument.
+    - query - expressjs query params object received by the server (just in case there is some data you need in there).
+  - `onData (err, chunk)` - a callback that should be called with each data chunk received as download is happening. The `err` argument is an error that should be passed if an error occurs during download. It should be `null` if there's no error. Once the download is completed and there are no more chunks to receive, `onData` should be called with `null` values like so `onData(null, null)`
+3. `size (options, done)` - returns the byte size of the file that needs to be downloaded.
+  - `options` - is an object containing the following attributes:
+    - token - authorization token (retrieved from oauth process) to send along with your request.
+    - id - ID of the file being downloaded.
+  - `done (err, size)` - the callback that should be called after the request to your provider is completed. As the signature indicates, the following data should be passed along to the callback `err`, and `size` (number).
+
+The class must also have an `authProvider` string (lowercased) field which typically indicates the name of the provider (e.g "dropbox").
+
+#### list data
+
+```js
+{
+  // username or email of the user whose provider account is being accessed
+  username: 'johndoe',
+  // list of files and folders in the directory. An item is considered a folder
+  //  if it mainly exists as a collection to contain sub-items
+  items: [
+    {
+      // boolean value of whether or NOT it's a folder
+      isFolder: false,
+      // icon image URL
+      icon: 'https://random-api.url.com/fileicon.jpg',
+      // name of the item
+      name: 'myfile.jpg',
+      // the mime type of the item. Only relevant if the item is NOT a folder
+      mimeType: 'image/jpg',
+      // the id (in string) of the item
+      id: 'uniqueitemid',
+      // thumbnail image URL. Only relevant if the item is NOT a folder
+      thumbnail: 'https://random-api.url.com/filethumbnail.jpg',
+      // for folders this is typically the value that will be passed as "directory" in the list(...) method.
+      // For files, this is the value that will be passed as id in the download(...) method.
+      requestPath: 'file-or-folder-requestpath',
+      // datetime string (in ISO 8601 format) of when this item was last modified
+      modifiedDate: '2020-06-29T19:59:58Z',
+      // the size in bytes of the item. Only relevent if the item is NOT a folder
+      size: 278940,
+      custom: {
+        // an object that may contain some more custom fields that you may need to send to the client. Only add this object if you have a need for it.
+        customData1: 'the value',
+        customData2: 'the value',
+      },
+      // more items here
+    }
+  ]
+  // if the "items" list is paginated, this is the request path needed to fetch the next page.
+  nextPagePath: 'directory-name?cursor=cursor-to-next-page'
+}
+```
 
 ## Development