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master
UnicodingUnicorn 3 years ago
parent
commit
37508f9456
  1. 80
      .gitignore
  2. 11
      Dockerfile
  3. 114
      README.md
  4. 65
      index.js
  5. 384
      package-lock.json
  6. 20
      package.json

80
.gitignore

@ -0,0 +1,80 @@
# Logs
logs
*.log
npm-debug.log*
yarn-debug.log*
yarn-error.log*
# Runtime data
pids
*.pid
*.seed
*.pid.lock
# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov
# Coverage directory used by tools like istanbul
coverage
# nyc test coverage
.nyc_output
# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
.grunt
# Bower dependency directory (https://bower.io/)
bower_components
# node-waf configuration
.lock-wscript
# Compiled binary addons (https://nodejs.org/api/addons.html)
build/Release
# Dependency directories
node_modules/
jspm_packages/
# TypeScript v1 declaration files
typings/
# Optional npm cache directory
.npm
# Optional eslint cache
.eslintcache
# Optional REPL history
.node_repl_history
# Output of 'npm pack'
*.tgz
# Yarn Integrity file
.yarn-integrity
# dotenv environment variables file
.env
.env.test
# parcel-bundler cache (https://parceljs.org/)
.cache
# next.js build output
.next
# nuxt.js build output
.nuxt
# vuepress build output
.vuepress/dist
# Serverless directories
.serverless/
# FuseBox cache
.fusebox/
# DynamoDB Local files
.dynamodb/

11
Dockerfile

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FROM node:8.15.0-jessie-slim
ENV PORT 1937
WORKDIR /app
ADD . /app
RUN npm install
EXPOSE $PORT
CMD ["node", "index.js"]

114
README.md

@ -1,3 +1,115 @@
# backend-signal
Beep backend handling WebRTC signalling.
Beep backend handling WebRTC signaling.
## Quickstart
Docker:
```bash
export PORT=1837 # Or whatever port number you like
docker build -t backend-signal . && docker run -it backend-signal
```
Not hipster (requires node.js):
```bash
export PORT=1837 # Or whatever port number you like
npm install
node index.js
```
## API
Unless otherwise noted, bodies and responses are with ```Content-Type: application/json```.
| Contents |
| -------- |
| [Subscribe to SSE](#Subscribe-to-SSE) |
| [Get a user's devices](#Get-a-user's-devices) |
| [Post data to a user's device](#Post-data-to-a-user's-device) |
### Subscribe to SSE
```
GET /subscribe/:user/device/:device
```
Subscribe a user's device to the signaling service. Recommended usage:
```js
const es = new EventSource(`${host}/subscribe/${user}/device/${device}`);
es.onmessage = (e) => {
const data = e.data;
// Do whatever with data
};
```
#### URL Params
| Name | Type | Description | Required |
| ---- | ---- | ----------- | -------- |
| user | String | User's ID. | ✓ |
| device | String | Device's ID. Must be unique to the device. I suggest something based on MAC address. | ✓ |
#### Success Response (200 OK)
An [EventSource](https://developer.mozilla.org/en-US/docs/Web/API/EventSource) stream.
---
### Get a user's devices
```
GET /user/:user/devices
```
Get a list of device IDs associated with the specified user. One can then use the IDs to post data to individual devices.
#### URL Params
| Name | Type | Description | Required |
| ---- | ---- | ----------- | -------- |
| user | String | Target user's ID. | ✓ |
#### Success Response (200 OK)
List of device IDs. Can be an empty list.
```
[ <id>, <id2>, ... ]
```
---
### Post data to a user's device
```
POST /user/:user/device/:device
```
Post data to the specified device of the specified user.
#### URL Params
| Name | Type | Description | Required |
| ---- | ---- | ----------- | -------- |
| user | String | Target user's ID. | ✓ |
| device | String | Target device's ID. | ✓ |
#### Body
| Name | Type | Description | Required |
| ---- | ---- | ----------- | -------- |
| data | String | Data to be sent. | ✓ |
#### Success Response (200 OK)
Empty body.
#### Errors
| Code | Description |
| ---- | ----------- |
| 400 | No data to be sent was supplied. |
| 404 | The specified user/device's connection could not be found. |

65
index.js

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require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
let app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
// CORS
app.use((req, res, next) => {
res.set('Access-Control-Allow-Origin', '*');
next();
});
let connections = {};
app.get('/subscribe/:user/device/:device', (req, res) => {
if (!connections[req.params.user]) {
connections[req.params.user] = {};
}
connections[req.params.user][req.params.device] = res;
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache'
});
// So the connection doesn't timeout and die
let timeoutID = 0;
const refresh = () => {
res.write(':\n\n');
timeoutID = setTimeout(refresh, 25000);
};
refresh();
res.on('close', () => {
connections[req.params.user][req.params.device] = null;
clearTimeout(timeoutID);
});
});
app.get('/user/:user/devices', (req, res) => {
if (!connections[req.params.user]) {
res.status(200).json([]);
} else {
res.status(200).json(Object.keys(connections[req.params.user]));
}
});
app.post('/user/:user/device/:device', (req, res) => {
if(!connections[req.params.user]){
res.sendStatus(404);
} else if (!connections[req.params.user][req.params.device]){
res.sendStatus(404);
} else if (!req.body.data) {
res.sendStatus(400);
} else {
connections[req.params.user][req.params.device].write(`data: ${req.body.data}\n\n`);
res.sendStatus(200);
}
});
app.listen(process.env.PORT, (err) => {
err ? console.error(err) : console.log(`Listening on port ${process.env.PORT}`);
});

384
package-lock.json

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20
package.json

@ -0,0 +1,20 @@
{
"name": "backend-signal",
"version": "1.0.0",
"description": "Beep backend handling WebRTC signalling",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "git@makerforce.io:beep/backend-signal.git"
},
"author": "Daniel Lim Hai",
"license": "ISC",
"dependencies": {
"body-parser": "^1.18.3",
"dotenv": "^6.2.0",
"express": "^4.16.4"
}
}
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