qrencode: qrencode is a wrapper of libqrencode with libpng for lua.

qrencode is a wrapper of libqrencode with libpng for lua.

Install

qrencode is dependent on libqrencode and libpng, so make sure these are installed before compile it.

CentOS

yum install -y qrencode-devel libpng-devel
make

Example usage

simple usage

qr = require "qrencode"

-- print PNG data stream to stdout.

print(qr.encode("is ok?"))
print(qr:encode("is ok?"))
print(qr("is ok?"))
print(qr {text = "is ok?", level = "M"})

-- or pass a table :

print(qr {
    text="is ok?",
    level="L",
    kanji=false,
    size=4,
    margin=2,
    symversion=0,
    dpi=78,
    casesensitive=false,
    foreground="48AF6D",
    background="3FAF6F"
}
)

in nginx lua

local qr = require "qrencode"
local args = ngx.req.get_uri_args()

ngx.header.content_type = 'image/png'
ngx.say(
  qr {
    text = args.text,
    size = args.size or 8,
    margin = args.margin or 1,
    symversion = 2,
    level = 'M',
    foreground = args.fg,
    background = args.bg
  }
)

or nginx config file

server {
    server_name qr.corp.com;

    location /qr {
        content_by_lua_block {
            local qr = require "qrencode"
            local args = ngx.req.get_uri_args()

            ngx.header.content_type = 'image/png'
            ngx.say( qr {
                text = args.text,
                size = args.size or 8,
                margin = args.margin or 1,
                symversion = 2,
                level = 'M',
                foreground = args.fg,
                background = args.bg
            })
        }
    }   
}

and visit http://qr.corp.com/qr?text=works to test it.

when pass a table, "text" is required and other is optional.

Author

vinoca https://www.vinoca.org/

Copyright and license

Code and documentation copyright 2014-2020 vinoca. Code released under the MIT license. Docs released under Creative commons.