#29 Make RDFViewer html template being configurable

app/controllers/RDFViewer.scala

@@ -1,18 +1,34 @@
 package controllers
 
 import play.api.mvc.Action
-import scalax.io.Input
+import scalax.io.{Resource, Input}
 import play.api.mvc.Results._
+import play.api.Logger
+import play.api.Play
+import java.io.File
 
 /**
  * Created by hjs on 18/11/2013.
  */
 object RDFViewer {
 
-  def htmlFor(url: String) = Action { request =>
+  val HtmlTemplatePathKey = "rdf.html.viewer.template.path"
+
+  def htmlTemplate: String = {
     import scalax.io.{Resource=>xResource}
-    val input:Input = xResource.fromFile("public/ldp/index.html")
-    val response = input.string.replace("window.location.href",s"'https://localhost:8443$url'")
+    val path = Play.current.configuration.getString(HtmlTemplatePathKey)
+    require(path.isDefined,s"Missing configuration for key $HtmlTemplatePathKey")
+    val file = new File(path.get)
+    require(file.exists() && file.isFile && file.canRead,s"Unable to read file: $file")
+    // we have checked the existence of the file before because this method xResource.fromFile creates the file if it doesn't exist
+    // (the doc says it raises an exception but it's not the case)
+    xResource.fromFile(file).string
+  }
+
+  // TODO it would probably be more elegant to use a real template key instead of "window.location.href"
+  def htmlFor(url: String) = Action { request =>
+    val template = htmlTemplate
+    val response = template.replace("window.location.href",s"'https://localhost:8443$url'")
     Ok(response).as("text/html")
   }
 

conf/application.conf

@@ -88,3 +88,5 @@ logger.rww=DEBUG
 #https.trustStore=test.WebIDTrustManager
 
 
+# Path of the base html template that is used to render the rdf content
+rdf.html.viewer.template.path="public/ldp/index.html"