├── .circleci
└── config.yml
├── .eslintrc
├── .gitignore
├── CONTRIBUTING.md
├── LICENSE
├── README.md
├── examples
├── paid-resources-images
│ ├── README.md
│ ├── images
│ │ └── example.png
│ ├── index.js
│ ├── package-lock.json
│ ├── package.json
│ └── static
│ │ └── index.html
└── paid-resources-video
│ ├── README.md
│ ├── index.js
│ ├── package-lock.json
│ ├── package.json
│ └── static
│ └── index.html
├── index.js
├── package-lock.json
├── package.json
└── src
├── bucket.js
├── monetizer.js
├── payer.js
└── stream-wrapper.js
/.circleci/config.yml:
--------------------------------------------------------------------------------
1 | # Javascript Node CircleCI 2.0 configuration file
2 | #
3 | # Check https://circleci.com/docs/2.0/language-javascript/ for more details
4 | #
5 | version: 2
6 |
7 | defaults: &defaults
8 | working_directory: ~/repo
9 | docker:
10 | - image: circleci/node:8.11.3
11 |
12 | jobs:
13 | test:
14 | <<: *defaults
15 | steps:
16 |
17 | - run:
18 | # By default node is installed as root and we are running as circleci
19 | # Using sudo causes wierd issues so we just switch to installing globals in our home dir
20 | name: Setup NPM to make global installs to home directory
21 | command: |
22 | echo "export PATH=$HOME/bin:$PATH" >> $BASH_ENV
23 | npm set prefix=$HOME
24 |
25 | - checkout
26 |
27 | - restore_cache:
28 | keys:
29 | # when lock file changes, use increasingly general patterns to restore cache
30 | - "node-v1-{{ .Branch }}-{{ checksum \"package-lock.json\" }}"
31 | - "node-v1-{{ .Branch }}-"
32 | - "node-v1-"
33 |
34 | - run:
35 | name: Install
36 | command: npm install
37 |
38 |
39 | - run:
40 | name: Lint
41 | command: npm run lint
42 |
43 | - save_cache:
44 | paths:
45 | - node_modules
46 | key: node-v1-{{ .Branch }}-{{ checksum "package-lock.json" }}
47 |
48 | - persist_to_workspace:
49 | root: ~/repo
50 | paths: .
51 |
52 | deploy:
53 | <<: *defaults
54 | steps:
55 | - attach_workspace:
56 | at: ~/repo
57 | - run:
58 | name: Authenticate with registry
59 | command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/repo/.npmrc
60 | - run:
61 | name: Publish package
62 | command: npm publish
63 |
64 | workflows:
65 | version: 2
66 | test-deploy:
67 | jobs:
68 | - test:
69 | filters:
70 | tags:
71 | only: /^v.*/
72 | - deploy:
73 | requires:
74 | - test
75 | filters:
76 | tags:
77 | only: /^v.*/
78 | branches:
79 | only: /^master$/
80 |
--------------------------------------------------------------------------------
/.eslintrc:
--------------------------------------------------------------------------------
1 | extends: standard
2 |
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | node_modules/
2 | examples/paid-resources-video/videos
3 | example.webm
4 |
--------------------------------------------------------------------------------
/CONTRIBUTING.md:
--------------------------------------------------------------------------------
1 | # Contributing to Interledger.js Repositories
2 |
3 | ## Getting Involved
4 |
5 | Detailed contribution guidelines are coming soon...
6 |
7 | ## Contributor License Agreement
8 |
9 | This project uses the [JS Foundation](https://js.foundation) CLA for licensing contributions.
10 |
11 | Please submit your pull request as you would with any other open source project on GitHub and our CLA Assistant bot will guide you through the signing process.
12 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | Copyright 2016 JS Foundation and contributors
2 | Copyright 2015-2016 Ripple, Inc. and contributors
3 |
4 | Licensed under the Apache License, Version 2.0 (the "License"); you may not use
5 | this file except in compliance with the License. You may obtain a copy of the
6 | License at
7 |
8 | http://www.apache.org/licenses/LICENSE-2.0
9 |
10 | Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
11 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Web Monetization Receiver
2 | > Server-side library for advanced Web Monetization integrations
3 |
4 | - [Overview](#overview)
5 | - [Examples](#examples)
6 | - [API](#api)
7 | - [`Monetizer`](#monetizer)
8 | - [`Monetizer.koa`](#monetizerkoa)
9 | - [`Monetizer.generateSPSPResponse`](#monetizergeneratespspresponse)
10 | - [`Monetizer.listen`](#monetizerlisten)
11 | - [`Monetizer.getBucket`](#monetizergetbucket)
12 | - [`Bucket`](#bucket)
13 | - [`Bucket.fund`](#bucketfund)
14 | - [`Bucket.spend`](#bucketspend)
15 | - [`Bucket.awaitBalance`](#bucketawaitbalance)
16 | - [`Bucket.awaitAndSpend`](#bucketawaitandspend)
17 | - [`Bucket.monetizeStream`](#bucketmonetizestream)
18 | - [`Payer`](#payer)
19 | - [`Payer.pay`](#payerpay)
20 |
21 | ## Overview
22 |
23 | Lots of sites can benefit from [Web Monetization](https://webmonetization.org).
24 | Most of the time, you can add a little bit of javascript that causes Web
25 | Monetization enabled users to donate to you ([The scripts are available
26 | here](https://github.com/interledgerjs/web-monetization-scripts)).
27 |
28 | Some sites might want to do more than this. For example, an image gallery might
29 | want to offer some images only to its Web Monetization enabled users. Or a
30 | video site might charge per second of video streamed.
31 |
32 | This repository contains tools which aim to make these advanced integrations easier.
33 |
34 | ## Examples
35 |
36 | Run `npm install` in this repository's root, then follow the README of the
37 | example you want to run.
38 |
39 | - [Serve Paid Images](https://github.com/sharafian/web-monetization-receiver/tree/master/examples/paid-resources-images)
40 | - [Serve Paid Video](https://github.com/sharafian/web-monetization-receiver/tree/master/examples/paid-resources-video)
41 |
42 | ## API
43 |
44 | ### `Monetizer`
45 |
46 | ```js
47 | const { Monetizer } = require('web-monetization-receiver')
48 | const monetizer = new Monetizer()
49 | ```
50 |
51 | Creates a "Monetizer" that wraps an [ILP/STREAM
52 | server](https://github.com/interledgerjs/ilp-protocol-stream) and exposes an
53 | easy to use API.
54 |
55 | You can use Monetizer to charge for different actions on your server using Web
56 | Monetization. It's best suited for web apps where your user is browsing your
57 | site and paying continuously with Web Monetization.
58 |
59 | #### Parameters
60 |
61 | - `opts: Object` - (Optional) Options for this Monetizer.
62 |
63 | - `opts.plugin: IlpPlugin` - (Optional) ILP Plugin to listen for payments
64 | with. By default, Monetizer creates a plugin to your local `moneyd` server.
65 |
66 | - `opts.buckets: Object` - (Optional) Options regarding buckets of payment that
67 | have been received by different site users.
68 |
69 | - `opts.buckets.timeout: Number` - (Optional) How long to wait before clearing
70 | an unused bucket.
71 |
72 | - `opts.buckets.capacity: Number` - (Optional) Maximum amount of payment to
73 | accumulate in a single bucket.
74 |
75 | ### `Monetizer.koa`
76 |
77 | ```js
78 | app.use(monetizer.koa())
79 | ```
80 |
81 | Connects this Monetizer instance to a [Koa](https://koajs.com/) app.
82 |
83 | - Adds an
84 | [SPSP](https://github.com/interledger/rfcs/tree/master/0009-simple-payment-setup-protocol)
85 | receiver to the server (responds to requests with `Accept: application/spsp4+json`)
86 |
87 | - Sets a `webMonetization` cookie on every client that hits the site. This is
88 | then used to associate each client with a bucket of payment, so that they can
89 | request paid resources from the server.
90 |
91 | - Adds `ctx.webMonetization` to the server, with the payment bucket associate
92 | with the current client. This can be used to charge for requests server-side.
93 | Look at the [Examples](#examples) section to see some ways to use it, or keep
94 | reading the API.
95 |
96 | #### Parameters
97 |
98 | - `opts: Object` - (Optional) Additional options for the receiver
99 |
100 | - `opts.spsp: boolean` - (Optional) (Default `true`) Whether to respond to SPSP
101 | requests. If this is set to false, you must write an SPSP receiver endpoint
102 | yourself using the `generateSPSPResponse` function.
103 |
104 | #### Return
105 |
106 | - Async middleware function for use by Koa.
107 |
108 | ### `Monetizer.generateSPSPResponse`
109 |
110 | ```js
111 | const jsonResponse = await monetizer.generateSPSPResponse(tag)
112 | ```
113 |
114 | Returns an SPSP response that allows a client to pay us. If you're using the
115 | `monetizer.koa()` you don't need to call this function anywhere. If you're not
116 | using Koa, then return `await monetizer.generateSPSPResponse(tag)` for any
117 | request that has `Accept` of `application/spsp4+json`. The `tag` should be a
118 | cookie that identifies the user.
119 |
120 | #### Parameters
121 |
122 | - `tag: string` - (Optional) Tag corresponding to this user.
123 |
124 | #### Return
125 |
126 | - `response: Object` - SPSP details that let your client pay you over
127 | Interledger. If they pay to these details, then their payment will
128 | accumulate in a bucket identified by their `tag`.
129 |
130 | - `response.destination_account: string` - ILP address for the client to pay
131 | to.
132 |
133 | - `response.shared_secret: string` - Shared secret used for authentication and
134 | encryption of data passed over Interledger.
135 |
136 | ### `Monetizer.listen`
137 |
138 | ```js
139 | await monetizer.listen()
140 | ```
141 |
142 | Initializes the STREAM server of this Monetizer. If you use
143 | `generateSPSPResponse` then it will call this function automatically.
144 |
145 | #### Parameters
146 |
147 | - None
148 |
149 | #### Return
150 |
151 | - Promise to null, resolves when server is initialized.
152 |
153 | ### `Monetizer.getBucket`
154 |
155 | ```js
156 | const bucket = monetizer.getBucket(tag)
157 | ```
158 |
159 | Gets a bucket associated with a given tag. If you're using the Koa middleware
160 | then on any route you can access `ctx.webMonetization` to access the current user's
161 | bucket (equivalent of `monetizer.getBucket(ctx.cookie.get('webMonetization'))`).
162 |
163 | If no money has been paid into the bucket, you'll just get an empty bucket.
164 |
165 | After a timeout (configurable via `opts.buckets.timeout` in the Monetizer
166 | constructor) any bucket that hasn't been used will be cleaned up.
167 |
168 | #### Parameters
169 |
170 | - `tag: string` - Tag corresponding to this user.
171 |
172 | #### Return
173 |
174 | - `bucket: Bucket` - [Bucket](#bucket) of payment for this user
175 |
176 | ### `Bucket`
177 |
178 | A bucket represents the payment received by the server from a specific user.
179 | You can use a bucket object to add/spend funds.
180 |
181 | The bucket constructor shouldn't be called directly, instead you should get it
182 | from `monetizer.getBucket` (or from `ctx.webMonetization` if you're using Koa).
183 |
184 | ### `Bucket.fund`
185 |
186 | ```js
187 | bucket.fund('1000')
188 | ```
189 |
190 | This function adds the given number of units to the bucket. There usually is no
191 | reason to call this directly, because the Monetizer's SPSP server will
192 | automatically fund the necessary buckets whenever payments are received.
193 |
194 | #### Parameters
195 |
196 | - `amount: string` - Amount of units (denominated in the units of your
197 | plugin/local moneyd) to add to this bucket.
198 |
199 | #### Return
200 |
201 | None
202 |
203 | ### `Bucket.spend`
204 |
205 | ```js
206 | if (bucket.spend('300')) {
207 | return paidContent
208 | } else {
209 | throw new Error('insufficient funds')
210 | }
211 | ```
212 |
213 | Subtracts funds from the bucket. Returns `true` if there were enough funds,
214 | and `false` otherwise.
215 |
216 | #### Parameters
217 |
218 | - `amount: string` - Amount of units (denominated in the units of your
219 | plugin/local moneyd) to subtract from this bucket.
220 |
221 | #### Return
222 |
223 | - `success: boolean` - Whether the bucket had enough funds and was subtracted
224 | from.
225 |
226 | ### `Bucket.awaitBalance`
227 |
228 | ```js
229 | await bucket.awaitBalance('1000')
230 | console.log('user can spend 1000 units')
231 | ```
232 |
233 | Waits until the user has accumulated a certain number of units in their bucket.
234 | This is useful for a web server where the client attempts to load all resources
235 | immediately but will take some time to pay for all of them (See [Examples](#examples)).
236 |
237 | This represents an absolute amount. If you `awaitBalance('1000')` it waits for
238 | the user to have 1000 units total, not 1000 units more than they did when the
239 | function was called.
240 |
241 | #### Parameters
242 |
243 | - `amount: string` - Amount of units (denominated in the units of your
244 | plugin/local moneyd) to wait for.
245 |
246 | #### Return
247 |
248 | - Promise to void which resolves when the amount is reached.
249 |
250 | ### `Bucket.awaitAndSpend`
251 |
252 | ```js
253 | await bucket.awaitAndSpend('1000')
254 | return paidContent
255 | ```
256 |
257 | Combines `awaitBalance` and `spend` into an atomic operation. First the balance
258 | is awaited, and then it is spent. If the spend fails, the await is repeated.
259 |
260 | #### Parameters
261 |
262 | - `amount: string` - Amount of units (denominated in the units of your
263 | plugin/local moneyd) to wait for and then spend.
264 |
265 | #### Return
266 |
267 | - Promise to void which resolves when the amount is reached and spent.
268 |
269 | ### `Bucket.monetizeStream`
270 |
271 | ```js
272 | const stream = fs.createReadStream('video.webm')
273 | return bucket.monetizeStream(stream)
274 | ```
275 |
276 | ```js
277 | const stream = fs.createReadStream('video.webm')
278 | return bucket.monetizeStream(stream, {
279 | freeBytes: 10000,
280 | costPerByte: (1 / 5000)
281 | })
282 | ```
283 |
284 | Turns a boring regular stream into a cool paid stream. Whenever a chunk of data
285 | is ready on the stream being read from, `chunk.length * costPerByte` units are
286 | subtracted from the bucket. If the bucket hasn't got sufficient funds, the read
287 | stream is paused. Once the bucket gets sufficient funds, the stream is resumed.
288 |
289 | You can use `freeBytes` to send a certain amount of data upfront without requiring
290 | payment (useful for buffering video quickly). `costPerByte` lets you fine-tune how
291 | much payment bandwidth is required to keep up with the stream.
292 |
293 | To see an example of usage, refer to the [video example](#examples).
294 |
295 | #### Parameters
296 |
297 | - `stream: ReadableStream` - [Node.js Readable
298 | Stream](https://nodejs.org/api/stream.html#stream_readable_streams) which is
299 | being monetized.
300 |
301 | - `opts: Object` - (Optional) Options to fine-tune the payment for this stream.
302 |
303 | - `opts.freeBytes: Number` - (Optional) How many free bytes to send up front.
304 | Default `0`.
305 |
306 | - `opts.costPerByte: Number` - (Optional) How much to charge per byte sent over
307 | this stream. Default `1 / 5000` (on a typical [Coil](https://coil.com) plan,
308 | this represents a rate of 500Kb/s)
309 |
310 | #### Return
311 |
312 | - `stream: ReadableStream` - Transformed stream which will charge for money as
313 | it goes. This stream also implements a special `money` event which fires
314 | whenever payment is charged for data going through the stream.
315 |
316 | ### `Payer`
317 |
318 | ```js
319 | const payer = new Payer({
320 | streamOpts: {
321 | minExchangeRatePrecision: 2
322 | }
323 | })
324 | ```
325 |
326 | Creates a `Payer` object. A Payer can be used to efficiently pay out to many different
327 | SPSP receivers. It keeps connections to each of the receivers cached until they time out
328 | in order to minimize the amount of connection re-establishment.
329 |
330 | #### Parameters
331 |
332 | - `opts: Object` - (Optional) additional options for this payer
333 | - `opts.streamOpts: Object` - (Optional) additional override object for
334 | `IlpStream.createConnection` calls. [You can read about the format
335 | here.](https://interledgerjs.github.io/ilp-protocol-stream/interfaces/_connection_.connectionopts.html)
336 |
337 | #### Return
338 |
339 | - `payer: Payer` - Payer object
340 |
341 | ### `Payer.pay`
342 |
343 | ```js
344 | await payer.pay('$twitter.xrptipbot.com/interledger', '100')
345 | ```
346 |
347 | Sends some money to a payment pointer. If a STREAM connection to this payment
348 | pointer already exists then the money is sent over that connection. If no
349 | STREAM connection to this payment pointer exists, then one is created.
350 |
351 | If the STREAM connection does not exist and cannot be established then this
352 | function will reject.
353 |
354 | #### Parameters
355 |
356 | - `pointer: string` - Payment pointer to send funds to.
357 |
358 | - `amount: string` - Amount of units (denominated in the units of your
359 | plugin/local moneyd) to send.
360 |
361 | #### Returns
362 |
363 | - Promise to void. Rejects if SPSP details cannot be loaded or the STREAM
364 | connection fails.
365 |
--------------------------------------------------------------------------------
/examples/paid-resources-images/README.md:
--------------------------------------------------------------------------------
1 | # Paid Resources Images
2 |
3 | Web server that charges users for images. When a web monetized user
4 | goes to this page, they'll receive an image of a rabbit after they
5 | send 300 drops.
6 |
7 | ## Setup
8 |
9 | - [Make sure you're running Moneyd on the
10 | livenet.](https://medium.com/interledger-blog/joining-the-live-ilp-network-eab123a73665)
11 |
12 | - Make sure you've either got an active [Coil](https://coil.com) subscription,
13 | or are running [your own Web Monetization
14 | provider](https://github.com/interledgerjs/ilp-wm-provider).
15 |
16 | ```sh
17 | npm install
18 | node index.js
19 | ```
20 |
21 | Then go to [http://localhost:8095](http://localhost:8095). After you pay 300
22 | drops, you'll receive the example image.
23 |
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/examples/paid-resources-images/images/example.png:
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https://raw.githubusercontent.com/interledgerjs/web-monetization-receiver/ec71588155d39df90c116f43786f77ae59f06248/examples/paid-resources-images/images/example.png
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/examples/paid-resources-images/index.js:
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1 | const Koa = require('koa')
2 | const app = new Koa()
3 | const router = require('koa-router')()
4 | const serve = require('koa-static')
5 | const path = require('path')
6 | const fs = require('fs')
7 |
8 | // const { Monetizer } = require('web-monetization-receiver')
9 | const { Monetizer } = require('../..')
10 | const monetizer = new Monetizer()
11 |
12 | const cost = 300
13 |
14 | router.get('/images/:id', async ctx => {
15 | await ctx.webMonetization.awaitAndSpend(cost)
16 | ctx.body = fs.readFileSync(path.resolve(
17 | __dirname,
18 | 'images',
19 | ctx.params.id
20 | ))
21 | })
22 |
23 | app
24 | .use(monetizer.koa())
25 | .use(router.routes())
26 | .use(router.allowedMethods())
27 | .use(serve(path.resolve(__dirname, './static')))
28 | .listen(process.env.PORT || 8095)
29 |
30 | console.log('listening on',
31 | process.env.PORT || 8095)
32 |
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/examples/paid-resources-images/package-lock.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "paid-resources-images",
3 | "version": "1.0.0",
4 | "lockfileVersion": 1,
5 | "requires": true,
6 | "dependencies": {
7 | "accepts": {
8 | "version": "1.3.5",
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44 | },
45 | "cookies": {
46 | "version": "0.7.2",
47 | "resolved": "https://registry.npmjs.org/cookies/-/cookies-0.7.2.tgz",
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49 | "requires": {
50 | "depd": "~1.1.2",
51 | "keygrip": "~1.0.2"
52 | }
53 | },
54 | "debug": {
55 | "version": "3.1.0",
56 | "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
57 | "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
58 | "requires": {
59 | "ms": "2.0.0"
60 | }
61 | },
62 | "deep-equal": {
63 | "version": "1.0.1",
64 | "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.0.1.tgz",
65 | "integrity": "sha1-9dJgKStmDghO/0zbyfCK0yR0SLU="
66 | },
67 | "delegates": {
68 | "version": "1.0.0",
69 | "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
70 | "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
71 | },
72 | "depd": {
73 | "version": "1.1.2",
74 | "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
75 | "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
76 | },
77 | "destroy": {
78 | "version": "1.0.4",
79 | "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
80 | "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
81 | },
82 | "ee-first": {
83 | "version": "1.1.1",
84 | "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
85 | "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
86 | },
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--------------------------------------------------------------------------------
/examples/paid-resources-images/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "paid-resources-images",
3 | "version": "1.0.0",
4 | "description": "",
5 | "main": "index.js",
6 | "scripts": {
7 | "test": "echo \"Error: no test specified\" && exit 1"
8 | },
9 | "author": "",
10 | "license": "ISC",
11 | "dependencies": {
12 | "koa": "^2.5.3",
13 | "koa-router": "^7.4.0",
14 | "koa-static": "^5.0.0"
15 | }
16 | }
17 |
--------------------------------------------------------------------------------
/examples/paid-resources-images/static/index.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
10 |
11 |
12 | Web Monetization Receiver
13 | Paid Resources Images
14 |
15 |
16 |
Web Monetization Receiver
13 | Paid Resources Video
14 |
15 |
18 |
19 |
20 |
21 |
--------------------------------------------------------------------------------
/index.js:
--------------------------------------------------------------------------------
1 | module.exports = {
2 | Monetizer: require('./src/monetizer'),
3 | Payer: require('./src/payer')
4 | }
5 |
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "web-monetization-receiver",
3 | "version": "1.1.3",
4 | "description": "",
5 | "main": "index.js",
6 | "scripts": {
7 | "test": "echo \"Error: no test specified\" && exit 1",
8 | "lint": "eslint ."
9 | },
10 | "author": "",
11 | "license": "Apache-2.0",
12 | "dependencies": {
13 | "axios": "^0.18.0",
14 | "ilp-plugin": "^3.3.1",
15 | "ilp-protocol-stream": "^1.8.1"
16 | },
17 | "devDependencies": {
18 | "eslint": "^4.16.0",
19 | "eslint-config-standard": "^11.0.0-beta.0",
20 | "eslint-plugin-import": "^2.8.0",
21 | "eslint-plugin-node": "^5.2.1",
22 | "eslint-plugin-promise": "^3.6.0",
23 | "eslint-plugin-standard": "^3.0.1"
24 | },
25 | "eslintIgnore": [
26 | "node_modules"
27 | ]
28 | }
29 |
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/src/bucket.js:
--------------------------------------------------------------------------------
1 | const stream = require('stream')
2 | const debug = require('debug')('web-monetization-receiver:bucket')
3 | const EventEmitter = require('events')
4 | const DEFAULT_THROUGHPUT = 100000
5 | const DEFAULT_WINDOW = 5000
6 | const DEFAULT_FREE_BYTES = 0
7 | const DEFAULT_COST_PER_BYTE = 1 / 5000
8 |
9 | class Bucket {
10 | constructor (opts = {}) {
11 | // default bucket capacity is infinite
12 | this.capacity = opts.capacity || Infinity
13 | this.balance = 0
14 | this.events = new EventEmitter()
15 |
16 | // sliding window of payment events
17 | this.window = []
18 | this.lastPulse = 0
19 | this._pulse = 0
20 | }
21 |
22 | _recalculatePulse () {
23 | let total = 0
24 | const now = Date.now()
25 | for (let i = 0; i < this.window.length; ++i) {
26 | if (this.window[i].date + DEFAULT_WINDOW < now) {
27 | this.window.splice(i, 1)
28 | --i
29 | continue
30 | }
31 | total += this.window[i].amount
32 | }
33 | return total / (DEFAULT_THROUGHPUT * (DEFAULT_WINDOW / 1000))
34 | }
35 |
36 | fund (amount) {
37 | const n = Number(amount)
38 | if (isNaN(n)) {
39 | throw new Error('invalid amount. amount=' + amount)
40 | }
41 |
42 | const now = Date.now()
43 | this.window.push({ amount: n, date: now })
44 |
45 | this.lastPulse = this._pulse
46 | this._pulse = this._recalculatePulse()
47 | this.balance = Math.min(
48 | this.balance + n,
49 | this.capacity)
50 | this.events.emit('fund', this.balance)
51 | }
52 |
53 | get pulse () {
54 | return this._recalculatePulse()
55 | }
56 |
57 | spend (amount) {
58 | const n = Number(amount)
59 | if (isNaN(n)) {
60 | throw new Error('invalid amount. amount=' + amount)
61 | }
62 |
63 | if (n > this.balance) {
64 | return false
65 | } else {
66 | this.balance -= n
67 | return true
68 | }
69 | }
70 |
71 | awaitBalance (balance) {
72 | const b = Number(balance)
73 | if (isNaN(b)) {
74 | throw new Error('invalid balance. balance=' + balance)
75 | }
76 |
77 | return new Promise(resolve => {
78 | const onFund = newBalance => {
79 | if (newBalance >= balance) {
80 | setImmediate(() =>
81 | this.events.removeListener('fund', onFund))
82 | resolve()
83 | }
84 | }
85 |
86 | this.events.on('fund', onFund)
87 | })
88 | }
89 |
90 | async awaitAndSpend (amount) {
91 | while (true) {
92 | await this.awaitBalance(amount)
93 | if (this.spend(amount)) {
94 | return
95 | }
96 | }
97 | }
98 |
99 | monetizeStream (readStream, {
100 | freeBytes = DEFAULT_FREE_BYTES,
101 | costPerByte = DEFAULT_COST_PER_BYTE
102 | } = {}) {
103 | const bucket = this
104 | const transform = new stream.Transform({
105 | writableObjectMode: true,
106 | transform: function (chunk, encoding, cb) {
107 | if (readStream.bytesRead < freeBytes) {
108 | cb(null, chunk)
109 | return
110 | }
111 |
112 | const cost = Math.ceil(chunk.length * costPerByte)
113 | if (!bucket.spend(cost)) {
114 | readStream.pause()
115 |
116 | bucket.awaitBalance(cost)
117 | .then(() => {
118 | this.emit('money', cost)
119 | cb(null, chunk)
120 | readStream.resume()
121 | })
122 | .catch(e => {
123 | debug('failed to resume stream. error=' + e.stack)
124 | })
125 | } else {
126 | this.emit('money', cost)
127 | cb(null, chunk)
128 | }
129 | }
130 | })
131 |
132 | return readStream.pipe(transform)
133 | }
134 | }
135 |
136 | module.exports = Bucket
137 |
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/src/monetizer.js:
--------------------------------------------------------------------------------
1 | const IlpStream = require('ilp-protocol-stream')
2 | const makePlugin = require('ilp-plugin')
3 | const EventEmitter = require('events')
4 | const crypto = require('crypto')
5 | const Bucket = require('./bucket')
6 |
7 | const InitStates = {
8 | NOT_CONNECTED: 0,
9 | CONNECTING: 1,
10 | CONNECTED: 2
11 | }
12 |
13 | class Monetizer {
14 | constructor (opts = {}) {
15 | this.plugin = opts.plugin || makePlugin()
16 |
17 | this.buckets = new Map()
18 | this.bucketOpts = opts.buckets || {}
19 | this.bucketTimers = new Map()
20 | this.bucketTimeout = (opts.buckets && opts.buckets.timeout) ||
21 | 60 * 1000
22 |
23 | this.events = new EventEmitter()
24 | this.initState = InitStates.NOT_CONNECTED
25 | }
26 |
27 | async listen () {
28 | if (this.initState === InitStates.CONNECTED) {
29 | return
30 | } else if (this.initState === InitStates.CONNECTING) {
31 | return new Promise(resolve => {
32 | this.events.once('connected', resolve)
33 | })
34 | }
35 |
36 | this.initState = InitStates.CONNECTING
37 |
38 | this.server = new IlpStream.Server({
39 | plugin: this.plugin,
40 | serverSecret: crypto.randomBytes(32)
41 | })
42 |
43 | this.server.on('connection', connection => {
44 | const tag = connection.connectionTag
45 | connection.on('stream', stream => {
46 | stream.setReceiveMax('999999999999999')
47 | stream.on('money', amount => {
48 | if (tag) this.getBucket(tag).fund(amount)
49 | })
50 | })
51 | })
52 |
53 | await this.server.listen()
54 |
55 | this.initState = InitStates.CONNECTED
56 | this.events.emit('connected')
57 | }
58 |
59 | async generateSPSPResponse (tag) {
60 | await this.listen()
61 |
62 | if (tag && !this.buckets.has(tag)) {
63 | this.buckets.set(tag, new Bucket(this.bucketOpts))
64 | }
65 |
66 | const details = this.server.generateAddressAndSecret(tag)
67 | return {
68 | destination_account: details.destinationAccount,
69 | shared_secret: details.sharedSecret.toString('base64')
70 | }
71 | }
72 |
73 | removeBucket (tag) {
74 | this.buckets.delete(tag)
75 | this.bucketTimers.delete(tag)
76 | }
77 |
78 | touchBucket (tag) {
79 | if (!this.buckets.has(tag)) {
80 | this.buckets.set(tag, new Bucket(this.bucketOpts))
81 | }
82 |
83 | if (this.bucketTimers.has(tag)) {
84 | clearTimeout(this.bucketTimers.get(tag))
85 | }
86 |
87 | const timer = setTimeout(() => this.removeBucket(tag),
88 | this.bucketTimeout)
89 | this.bucketTimers.set(tag, timer)
90 | }
91 |
92 | getBucket (tag) {
93 | this.touchBucket(tag)
94 | return this.buckets.get(tag)
95 | }
96 |
97 | koa ({ spsp = true } = {}) {
98 | return async (ctx, next) => {
99 | if (!ctx.cookies.get('webMonetization')) {
100 | ctx.cookies.set('webMonetization', crypto.randomBytes(16).toString('hex'))
101 | }
102 |
103 | const tag = ctx.cookies.get('webMonetization')
104 | ctx.webMonetization = this.getBucket(tag)
105 |
106 | if (spsp && ctx.get('accept').includes('application/spsp4+json')) {
107 | ctx.body = await this.generateSPSPResponse(tag)
108 | ctx.set('Content-Type', 'application/spsp4+json')
109 | return
110 | }
111 |
112 | return next()
113 | }
114 | }
115 | }
116 |
117 | module.exports = Monetizer
118 |
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/src/payer.js:
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1 | const StreamWrapper = require('./stream-wrapper')
2 |
3 | class Payer {
4 | constructor ({ streamOpts = {} } = {}) {
5 | this.receivers = new Map()
6 | this.streamOpts = streamOpts
7 | this.closed = false
8 | }
9 |
10 | async createReceiver (pointer) {
11 | const receiver = new StreamWrapper({
12 | streamOpts: this.streamOpts,
13 | pointer
14 | })
15 |
16 | const ready = receiver.connect()
17 | .then(() => receiver)
18 | .catch((err) => {
19 | this.receivers.delete(pointer)
20 | throw err
21 | })
22 | this.receivers.set(pointer, ready)
23 | await ready
24 |
25 | receiver.getStream()
26 | .once('end', () => {
27 | this.receivers.delete(pointer)
28 | })
29 | .once('close', () => {
30 | this.receivers.delete(pointer)
31 | })
32 | .once('error', () => {
33 | this.receivers.delete(pointer)
34 | })
35 |
36 | return receiver
37 | }
38 |
39 | async getReceiver (pointer) {
40 | return this.receivers.get(pointer) || this.createReceiver(pointer)
41 | }
42 |
43 | async pay (pointer, amount) {
44 | if (this.closed) {
45 | throw new Error('paying is closing so payments are stopped')
46 | }
47 |
48 | const receiver = await this.getReceiver(pointer)
49 | const stream = receiver.getStream()
50 | stream.setSendMax(Number(stream.sendMax) + Number(amount))
51 | }
52 | }
53 |
54 | module.exports = Payer
55 |
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/src/stream-wrapper.js:
--------------------------------------------------------------------------------
1 | const IlpStream = require('ilp-protocol-stream')
2 | const makePlugin = require('ilp-plugin')
3 | const axios = require('axios')
4 | const EventEmitter = require('events')
5 |
6 | const StreamStates = {
7 | NOT_CONNECTED: 0,
8 | CONNECTING: 1,
9 | CONNECTED: 2
10 | }
11 |
12 | function pointerToUrl (pointer) {
13 | return pointer.startsWith('$')
14 | ? 'https://' + pointer.substring(1)
15 | : pointer
16 | }
17 |
18 | class StreamWrapper extends EventEmitter {
19 | constructor ({ pointer, streamOpts }) {
20 | super()
21 |
22 | this.pointer = pointer
23 | this.state = StreamStates.NOT_CONNECTED
24 | this.connection = null
25 | this.stream = null
26 | this.streamOpts = streamOpts
27 | }
28 |
29 | getConnection () {
30 | return this.connection
31 | }
32 |
33 | getStream () {
34 | return this.stream
35 | }
36 |
37 | isConnected () {
38 | return this.state === StreamStates.CONNECTED
39 | }
40 |
41 | async connect () {
42 | if (this.state === StreamStates.CONNECTED) {
43 | return
44 | }
45 |
46 | if (this.state === StreamStates.CONNECTING) {
47 | return new Promise(resolve => {
48 | this.once('connected', resolve)
49 | })
50 | }
51 |
52 | this.state = StreamStates.CONNECTING
53 |
54 | console.log('requesting pointer', this.pointer, pointerToUrl(this.pointer))
55 | const res = await axios({
56 | method: 'GET',
57 | url: pointerToUrl(this.pointer),
58 | headers: {
59 | accept: 'application/spsp4+json'
60 | }
61 | })
62 |
63 | this.connection = await IlpStream.createConnection({
64 | plugin: makePlugin(),
65 | destinationAccount: res.data.destination_account,
66 | sharedSecret: Buffer.from(res.data.shared_secret, 'base64'),
67 | ...this.streamOpts
68 | })
69 |
70 | this.connection
71 | .once('close', () => {
72 | this.state = StreamStates.NOT_CONNECTED
73 | })
74 | .once('error', (_err) => {
75 | this.state = StreamStates.NOT_CONNECTED
76 | })
77 |
78 | this.stream = this.connection.createStream()
79 | this.state = StreamStates.CONNECTED
80 | this.emit('connected')
81 | }
82 | }
83 |
84 | module.exports = StreamWrapper
85 |
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