SCaptcha

Scala captcha, or Simple captcha, and probably both Simple Scala (functional) captcha.

Usage

SBT

To use SCaptcha in your SBT (or Play) projects, you can either built it yourself (see thereafter), or add following resolver:

resolvers += "Applicius Snapshots" at "https://raw.github.com/applicius/mvn-repo/master/snapshots/"

libraryDependencies += "scaptcha" %% "scaptcha" % "1.0-SNAPSHOT"

Playframework

It can be integrated as Play controller.

First in view (e.g. temporal catcha of 8 characters):

  @defining(Captcha.temporalCaptcha(8)) { captcha =>
  <form action="yourAction">
    <img src="@[email protected](captcha.value)" />
    <input type="text" name="passphrase" value="" />
    <input type="hidden" name="captchaCode" value="@captcha.code" />
  </form>
  }

Then in controllers:

package controllers

import play.api.Play
import play.api.libs.iteratee.Enumerator
import play.api.mvc.{ Action, Controller }

object Captcha extends Controller with scaptcha.Captcha {
  // Use Play application secret as scaptcha seed
  lazy val seed = Play.current.configuration.
    getString("application.secret").map(_.filter(_ != '/')).
    getOrElse(System.identityHashCode(this).toString)

  def image(text: String) = Action {
    val imageStream = textImage(text)

    Ok.stream(Enumerator.fromStream(imageStream)).as("image/png")
  }
}

Finally, when form including captcha is submitted, it can be checked easily:

Captcha.matches(captchaCode/* catcha.code */, length/* of captcha.value */, passphrase) // Boolean

Build

sbt package