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codeblock-iframe

v1.0.1

Published

A library that can let you use iframe in markdown extra syntax securely!

Downloads

749

Readme

codeblock-iframe

version download cnpmVersion cnpmDownload jsdelivr

一个可以让你通过markdown拓展语法更加安全使用iframe的库, 这个是cdn直接引用的版本。

如果你想打包配合webpack使用, 请使用toml2iframe这个库

简体中文 | English

体验一下

在这个 Demo 里, 你可以体验这种转化方式!

使用方法

插入script标签引用

<script src="https://cdn.jsdelivr.net/npm/codeblock-iframe@latest/dist/index.min.js"></script>

之后就可以通过全局变量__codeblock_iframe来使用这个库的方法了

// iframe attributes
const content = `
src="www.baidu.com"
width="100%"
height="500"
`
const converter_result = window.__codeblock_iframe.converter(content)
const filter_result = window.__codeblock_iframe.filter(content, ["www.baidu.com", "www.google.com"])

console.log(converter_result)
// output: [
//  '<iframe src="www.baidu.com" width="100%" height="500"></iframe>',
//  true,
//  [ 'src', 'width', 'height' ]
//]

console.log(filter_result)
// output: [ true, 'www.baidu.com' ]

src符合下面的格式才会被支持

www.baidu.com
//www.baidu.com
http://www.baidu.com
https://www.baidu.com

可用函数

  • iframe属性

| 属性名 | | ------------ | | src | | height | | width | | align | | frameborder | | longdesc | | marginheight | | marginwidth | | name | | sandbox | | scrolling | | seamless | | srcdoc | | textContent |

  • 参数

| 参数 | 类型 | 说明 | | ------- | --------------- | --------------------------------------------------------------------------------- | | content | string | iframe标签的属性 (子组件使用textContent), 使用标准TOML语法书写 | | filters | Array<string> | 允许的域名列表 (在filter函数中这个参数需要传入不要写协议,直接写域名就好了) |

  • 函数
  1. converter(content: string, filters?: Array<string>): 转化iframe的属性到iframe标签元素
  2. filter(content: string, filters: Array<string>): 过滤域名
  • 输出

For converter(content: string, filters?: Array<string>): [ 结果, 是否过了过滤, [ 属性的名称 (给debug用的) ] ]

For filter(content: string, filters: Array<string>): [ 是否过了过滤, 域名 (如果src的值不是合法路径, 会返回输入src的值) ]

/www.baidu.com 不是合法路径, 直接使用 www.baidu.com ! 如果你想使用同源页面, 不要传 filters 这个参数, 不然在 converter 函数你拿不到结果!!! 或者, 你写src的时候写全同源页面完整的路径, 并且把你同源页面的路由传到filters参数里面去, 这就可以了!!

为什么要写这个库

讲道理, Markdown原生就支持HTML! 但是下面场景我们会遇到一些问题:

  1. 如果我不想让我的用户通过iframe给我们的网站插入广告, 但是我们支持他们用codepen来分享自己的代码, 咋办?
  2. 有时候我们想在一些markdown编辑器中插入iframe。为了即时渲染, 浏览器会在我们输入的时候发送大量的GET请求给我们的目标网站, 我们如何去做优化?甚至于当我们开发的时候开启SSR渲染页面, 可能会导致页面崩溃

怎么实现

代码块渲染对我们拓展markdown原生语法非常简单, 所以我们可以通过上面的策略来限制iframe渲染的频率

感谢

  • iarna-toml: Better TOML parsing and stringifying all in that familiar JSON interface.