Question

my Grails app generates files in a folder (e.g. “output”).
How can I make that folder public, in order to expose the output files through URLs like:

http://localhost:8080/MyGrailsApp/output/myOutputFile1.xml
http://localhost:8080/MyGrailsApp/output/myOutputFile2.xml

Cheers!

Answer 1

This code is not perfect or tested, just typed it in here, but it should get you headed in the right direction

create a controller called OutputController.groovy

def viewFile = {

    // add checks to ensure fileName parameter has no "/" or ".." to
    // prevent directory transversal

    def file = new File(OUTPUT_FILE_PATH + params?.fileName)

    if (file.exists()) {
        render(text: file.newInputStream().text, contentType: "text/plain",
                       encoding: "UTF-8")
    } else {
        render "FILE NOT FOUND: ${params?.fileName}"
    }
}

update url mappings file

mappings {
  "/output/$fileName?" {
      controller = "output"
      action = "viewFile"
  }
}