237899745
4350113979
- 在editStorageForm中初始化oss_storage_quota_value和oss_quota_unit - 删除重复的旧配额说明块，保留新的当前配额设置显示 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
124 lines
3.9 KiB
Markdown
124 lines
3.9 KiB
Markdown
|
|
|
|
<div align="center">
|
|
|
|
[](https://travis-ci.org/lemonce/svg-captcha)
|
|
[](https://www.npmjs.com/package/svg-captcha)
|
|
[](https://www.npmjs.com/package/svg-captcha)
|
|
|
|
</div>
|
|
|
|
> generate svg captcha in node.js
|
|
|
|
## Translations
|
|
[中文](README_CN.md)
|
|
|
|
## useful if you
|
|
|
|
- cannot or do not want to use google recaptcha
|
|
- have issue with install c++ addon
|
|
|
|
## install
|
|
```
|
|
npm install --save svg-captcha
|
|
```
|
|
|
|
## usage
|
|
```Javascript
|
|
var svgCaptcha = require('svg-captcha');
|
|
|
|
var captcha = svgCaptcha.create();
|
|
console.log(captcha);
|
|
// {data: '<svg.../svg>', text: 'abcd'}
|
|
```
|
|
with express
|
|
```Javascript
|
|
var svgCaptcha = require('svg-captcha');
|
|
|
|
app.get('/captcha', function (req, res) {
|
|
var captcha = svgCaptcha.create();
|
|
req.session.captcha = captcha.text;
|
|
|
|
res.type('svg');
|
|
res.status(200).send(captcha.data);
|
|
});
|
|
```
|
|
|
|
## API
|
|
|
|
#### `svgCaptcha.create(options)`
|
|
If no option is passed, you will get a random string of four characters and corresponding svg.
|
|
|
|
* `size`: 4 // size of random string
|
|
* `ignoreChars`: '0o1i' // filter out some characters like 0o1i
|
|
* `noise`: 1 // number of noise lines
|
|
* `color`: true // characters will have distinct colors instead of grey, true if background option is set
|
|
* `background`: '#cc9966' // background color of the svg image
|
|
|
|
This function returns an object that has the following property:
|
|
* `data`: string // svg path data
|
|
* `text`: string // captcha text
|
|
|
|
#### `svgCaptcha.createMathExpr(options)`
|
|
Similar to create api, you have the above options plus 3 additional:
|
|
* `mathMin`: 1 // the minimum value the math expression can be
|
|
* `mathMax`: 9 // the maximum value the math expression can be
|
|
* `mathOperator`: + // The operator to use, `+`, `-` or `+-` (for random `+` or `-`)
|
|
|
|
This function returns an object that has the following property:
|
|
* `data`: string // svg of the math expression
|
|
* `text`: string // the answer of the math expression
|
|
|
|
#### `svgCaptcha.loadFont(url)`
|
|
Load your own font and override the default font.
|
|
* `url`: string // path to your font
|
|
This api is a wrapper around loadFont api of opentype.js.
|
|
Your may need experiment around various options to make your own font accessible.
|
|
See the following api.
|
|
|
|
#### `svgCaptcha.options`
|
|
Gain access to global setting object.
|
|
It is used for create and createMathExpr api as the default options.
|
|
|
|
In addition to size, noise, color, and background, you can also set the following property:
|
|
* `width`: number // width of captcha
|
|
* `height`: number // height of captcha
|
|
* `fontSize`: number // captcha text size
|
|
* `charPreset`: string // random character preset
|
|
|
|
#### `svgCaptcha.randomText([size|options])`
|
|
return a random string.
|
|
#### `svgCaptcha(text, options)`
|
|
return a svg captcha based on text provided.
|
|
|
|
In pre 1.1.0 version you have to call these two functions,
|
|
now you can call create() to save some key strokes ;).
|
|
|
|
## sample image
|
|
default captcha image:
|
|
|
|
|
|
|
|
math expression image with color options:
|
|
|
|
|
|
|
|
## why use svg?
|
|
|
|
It does not require any c++ addon.
|
|
The result image is smaller than jpeg image.
|
|
|
|
> This has to be a joke. /\<text.+\>;.+\<\/text\>/g.test...
|
|
|
|
svg captcha uses opentype.js underneath, which means that there is no
|
|
'<text>1234</text>'.
|
|
You get
|
|
'<path fill="#444" d="M104.83 19.74L107.85 19.74L112 33.56L116.13 19.74L119.15 19.74L113.48 36.85...'
|
|
instead.
|
|
|
|
Even though you can write a program that convert svg to png, svg captcha has done its job
|
|
—— make captcha recognition harder
|
|
|
|
## License
|
|
[MIT](LICENSE.md)
|