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      qrcode

      A plugin that allows you to create QR codes as part of your Grails application without the need for an external service

      Owner: technipelago | 0.9 | Mar 31, 2016 | Package | Issues | Source | License: Apache-2.0

      17
      
      dependencies {
          compile 'org.grails.plugins:qrcode:0.9'
      }
      
                  

      This plugin allows you to create QR codes as part of your Grails application without the need for an external service.

      Installation

      For Grails 2 use version 0.7, for Grails 3 use version 0.8+.

      Grails 2

      Add a dependency in BuildConfig.groovy:

      grails.project.dependency.resolution = {
        // ...
        plugins {
          compile ':qrcode:0.7'
          // ...
        }
      }
      

      Grails 3

      Add a dependency in build.gradle

      compile 'org.grails.plugins:qrcode:0.9'
      

      Usage

      QrcodeController

      Render text QRCode at default size (300x300px)

      .../qrcode/text/Hello+World
      

      Render text QRCode in 30x30px

      .../qrcode/text?w=30&text=test
      

      QRCode

      Render url QRCode
      
      .../qrcode/url?u=http://grails.org/plugin/qrcode
      

      Configuration

      The maximum value of the width parameter can be configured with qrcode.size.max (default 1024).

      qrcode.size.max = 2048
      

      QrCodeService

      qrCodeService.renderPng("test", 30, outputStream)
      

      Tag Library

      Namespace: qrcode

      Render text as QRCode

      <qrcode:image height="100" width="100" text="TEST TEXT"/>
      

      If you want to include a QRCode image in an email and you use a GSP to render email content you must set attribute absolute="true". Otherwise the image url will not start with http:// and will probably not render correct.

      <qrcode:image height="100" width="100" text="#648357" alt="Invoice #648357" absolute="true"/>
      

      Render current request url as QRCode

      <qrcode:url width="64"/>
      

      Render vCard contact information as QRCode

      In this example we have a method on the Person domain class that returns contact information as a vCard formatted String.

      class Person {
          ...
          transient String getVcard() {
              def s = new StringBuilder()
              s << "BEGIN:VCARD\n"
              s << "VERSION:3.0\n"
              s << "N:${lastName};${firstName};;;\n"
              s << "FN: ${fullName}\n"
              s << "ORG:${companyName}\n"
              s << "TITLE:${title ? title.replace(',', '\\,') : ''}\n"
              s << "TEL;TYPE=work,voice,pref:${phone}\n"
              s << "TEL;TYPE=cell,voice:${cellphone}\n"
              s << "EMAIL;type=internet,pref:${email}\n"
              s << "ADR;TYPE=work,postal,pref:;;${address};${city};${state};${postalCode};${country}\n"
              def timestampFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'")
              s << "REV:${timestampFormat.format(lastUpdated ?: dateCreated)}\n"
              s << "END:VCARD\n"
              return s.toString()
          }
      }
      

      Now it's easy to render a QRCode of the contact information. This QRCode can be scanned with a smartphone and imported as a contact.

      <qrcode:image height="150" text="${person.vcard}" alt="${person.fullName} ${person.address} ${person.city}"/>
      

      Changes

      Version 0.9: Prevent DoS attempts using large size/width values.

      Version 0.8: Grails 3 support.

      Version 0.7: Upgraded zxing dependency to 3.2.0.

      Version 0.6: Upgraded pngj dependency to 2.1.0.

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