Index

egjs-agent

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Support TypeScript

Extracts browser and operating system information from the user agent string or user agent object(userAgentData).

Documents

Download and Installation

Download dist files from repo directly or install it via npm.

Installation with npm

The following command shows how to install egjs-agent using npm.

$ npm install @egjs/agent

For development

You can download the files for development

  • Latest : https://naver.github.io/egjs-agent/release/latest/dist/agent.js
  • Latest(min): https://naver.github.io/egjs-agent/release/latest/dist/agent.min.js
  • Specific version : https://naver.github.io/egjs-agent/release/[VERSION]/dist/agent.js
  • Specific version(min): https://naver.github.io/egjs-agent/release/[VERSION]/dist/agent.min.js

Prepare for Client Hints!

Chrome was planned to freeze userAgent to improve user privacy, and it is being applied as an experimental feature in 84+.

Not only Chrome, but other browsers will come someday.

It is still an experimental feature until Chrome(Chromium) 86.

If you want to test, enable the flag below.

chrome://flags/#enable-experimental-web-platform-features

chrome://flags/#freeze-user-agent

In Chrome (Chrome 87, Mac, Freeze User-Agent)

  • Before
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4243.0 Safari/537.36
  • After
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.0.0 Safari/537.36

In the future

  1. the following attribute values will not appear correctly.
    • navigator.userAgent
    • navigator.appVersion
    • navigator.platform
    • navigator.productSub
    • navigator.vendor
  2. You should use navigator.userAgentData instead of navigator.userAgent.
    • Browser version only shows major.
    • OS name, OS version, Browser full version should be fetched asynchronously.
    • The only OS name that you can check synchronously are iOS and Android.

Possible (You can know exactly)

  • Check browser name, major version
  • Check mobile
  • Check iOS, Android
  • Check Webkit, Chromium
  • Check old OS, OS Version (Chrome 84 support range or less)
    • < Android 5.0
    • < Mac OS X 10.10
    • < Windows 7
    • < iOS Unknown
import getAgent from "@egjs/agent";

const agent = getAgent();

// Check iOS
agent.os.name === "ios"
agent.os.majorVersion === 9
// Check Android
agent.os.name === "android"
agent.os.majorVersion === 4
parseFloat(agent.os.version) <= 4.4
// Check browser name
agent.browser.name === "safari"
// Check webkit
agent.browser.webkit
// Check chromium
agent.browser.chromium

Not Possible (If synchronous)

  • Check OS (Mac with browsers except Safari, Windows, Linux), OS version
  • Check Browser full version.
import getAgent from "@egjs/agent";
const agent = getAgent();

// If the full version is 10.5, it is displayed as 10.
agent.browser.version
// "unknown"
agent.os.name
// -1
agent.os.majorVersion

Possible (If asynchronous)

  • You can get accurate agent information.
  • Check OS(Mac, Windows, Linux), OS version
  • Check Browser full version.
import { getAccurateAgent } from "@egjs/agent";

// Use Promise
getAccurateAgent().then(agent => {
    // Check OS, OS version
    agent.os.name
    agent.os.version

    // Check Browser full verion
    agent.browser.version
});

// Use Callback
getAccurateAgent(agent => {});

If you dare to use synchrous, you have to choose.

  • You cannot get the OS name and version other than iOS, Android.
  • You can only get the major version of the browser. However, unless there is a serious bug, you will mainly check the major version.
  • Instead, infer to browser, Webkit, or Chromium.

Examples

  • Check Mac Safari, iOS all browsers

Mac Safari, iOS all browsers are webkit.

import getAgent from "@egjs/agent";

const agent = getAgent();

if ((agent.os.name === "mac" || agent.os.name === "ios") && agent.browser.webkit) {
    console.log("is mac, ios webkit");
}
  • Check Android version >= 5
import getAgent from "@egjs/agent";

const agent = getAgent();

if (
    agent.os.name === "android"
    && (agent.os.majorVersion >= 5 || agent.isHints)) {
    console.log("is Android >= 5");
}
  • Check iOS version >= 10
import getAgent from "@egjs/agent";

const agent = getAgent();


if (
    agent.os.name === "ios"
    && (agent.os.majorVersion >= 10 || agent.isHints)
) {
    console.log("is iOS");
}

Supported Browsers

The following are the supported browsers.

Internet Explorer Chrome Firefox Safari iOS Android
7+ latest latest latest 3+ 2.1+

Client Hints Support

Chromium (Chrome, Edge, Whale) Gecko (Firefox) Webkit (Safari)
84+ (Experimental) Unknown Unknown

How to start developing egjs-agent?

For anyone interested to develop egjs-agent, follow the instructions below.

Development Environment

1. Clone the repository

Clone the egjs-agent repository and install the dependency modules.

# Clone the repository.
$ git clone https://github.com/naver/egjs-agent.git

2. Install dependencies

npm is supported.

# Install the dependency modules.
$ npm install

3. Build

Use npm script to build eg.agent

# Run rollup
$ npm start

# Build
$ npm run build

# Generate jsdoc
$ npm run jsdoc

Two folders will be created after complete build is completed.

  • dist folder: Includes the agent.js and agent.min.js files.
  • doc folder: Includes API documentation. The home page for the documentation is doc/index.html.

Linting

To keep the same code style, we adopted ESLint to maintain our code quality.
Setup your editor for check or run below command for linting.

$ npm run lint

Test

Once you created a branch and done with development, you must perform a test running npm run test command before you push code to a remote repository.

$ npm run test

Running a npm run test command will start Jest.

Bug Report

If you find a bug, please report it to us using the Issues page on GitHub.

License

egjs-agent is released under the MIT license.

Copyright (c) 2015 NAVER Corp.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
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