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 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* vim: set ts=8 sts=2 et sw=2 tw=80: */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /* Debug and Error wrapper functions for dump().

  */

 function ERR(response, responseCode, responseCodeStr, msg)

 {

   // Reset state var.

   setState("expectedRequestType", "");

   // Dump to console log and send to client in response.

   dump("SERVER ERROR: " + msg + "\n");

   response.write("HTTP/1.1 " + responseCode + " " + responseCodeStr + "\r\n");

   response.write("Content-Type: text/html; charset=UTF-8\r\n");

   response.write("Content-Length: " + msg.length + "\r\n");

   response.write("\r\n");

   response.write(msg);

 }

 function DBG(msg)

 {

   // Dump to console only.

   dump("SERVER DEBUG: " + msg + "\n");

 }

 /* Delivers content in parts to test partially cached content: requires two

  * requests for the same resource.

  *

  * First call will respond with partial content, but a 200 header and

  * Content-Length equal to the full content length. No Range or If-Range

  * headers are allowed in the request.

  *

  * Second call will require Range and If-Range in the request headers, and

  * will respond with the range requested.

  */

 function handleRequest(request, response)

 {

   DBG("Trying to seize power");

   response.seizePower();

   DBG("About to check state vars");

   // Get state var to determine if this is the first or second request.

   var expectedRequestType;

   var lastModified;

   if (getState("expectedRequestType") === "") {

     DBG("First call: Should be requesting full content.");

     expectedRequestType = "fullRequest";

     // Set state var for second request.

     setState("expectedRequestType", "partialRequest");

     // Create lastModified variable for responses.

     lastModified = (new Date()).toUTCString();

     setState("lastModified", lastModified);

   } else if (getState("expectedRequestType") === "partialRequest") {

     DBG("Second call: Should be requesting undelivered content.");

     expectedRequestType = "partialRequest";

     // Reset state var for first request.

     setState("expectedRequestType", "");

     // Get last modified date and reset state var.

     lastModified = getState("lastModified");

   } else {

     ERR(response, 500, "Internal Server Error",

         "Invalid expectedRequestType \"" + expectedRequestType + "\"in " +

         "server state db.");

     return;

   }

   // Look for Range and If-Range

   var range = request.hasHeader("Range") ? request.getHeader("Range") : "";

   var ifRange = request.hasHeader("If-Range") ? request.getHeader("If-Range") : "";

   if (expectedRequestType === "fullRequest") {

     // Should not have Range or If-Range in first request.

     if (range && range.length > 0) {

       ERR(response, 400, "Bad Request",

           "Should not receive \"Range: " + range + "\" for first, full request.");

       return;

     }

     if (ifRange && ifRange.length > 0) {

       ERR(response, 400, "Bad Request",

           "Should not receive \"Range: " + range + "\" for first, full request.");

       return;

     }

   } else if (expectedRequestType === "partialRequest") {

     // Range AND If-Range should both be present in second request.

     if (!range) {

       ERR(response, 400, "Bad Request",

           "Should receive \"Range: \" for second, partial request.");

       return;

     }

     if (!ifRange) {

       ERR(response, 400, "Bad Request",

           "Should receive \"If-Range: \" for second, partial request.");

       return;

     }

   } else {

     // Somewhat redundant, but a check for errors in this test code.

     ERR(response, 500, "Internal Server Error",

         "expectedRequestType not set correctly: \"" + expectedRequestType + "\"");

     return;

   }

   // Prepare content in two parts for responses.

   var partialContent = "<html><head></head><body><p id=\"firstResponse\">" +

                        "First response</p>";

   var remainderContent = "<p id=\"secondResponse\">Second response</p>" +

                          "</body></html>";

   var totalLength = partialContent.length + remainderContent.length;

   DBG("totalLength: " + totalLength);

   // Prepare common headers for the two responses.

   date = new Date();

   DBG("Date: " + date.toUTCString() + ", Last-Modified: " + lastModified);

   var commonHeaders = "Date: " + date.toUTCString() + "\r\n" +

                       "Last-Modified: " + lastModified + "\r\n" +

                       "Content-Type: text/html; charset=UTF-8\r\n" +

                       "ETag: abcd0123\r\n" +

                       "Accept-Ranges: bytes\r\n";

   // Prepare specific headers and content for first and second responses.

   if (expectedRequestType === "fullRequest") {

     DBG("First response: Sending partial content with a full header");

     response.write("HTTP/1.1 200 OK\r\n");

     response.write(commonHeaders);

     // Set Content-Length to full length of resource.

     response.write("Content-Length: " + totalLength + "\r\n");

     response.write("\r\n");

     response.write(partialContent);

   } else if (expectedRequestType === "partialRequest") {

     DBG("Second response: Sending remaining content with a range header");

     response.write("HTTP/1.1 206 Partial Content\r\n");

     response.write(commonHeaders);

     // Set Content-Length to length of bytes transmitted.

     response.write("Content-Length: " + remainderContent.length + "\r\n");

     response.write("Content-Range: bytes " + partialContent.length + "-" +

                    (totalLength - 1) + "/" + totalLength + "\r\n");

     response.write("\r\n");

     response.write(remainderContent);

   } else {

     // Somewhat redundant, but a check for errors in this test code.

     ERR(response, 500, "Internal Server Error",

        "Something very bad happened here: expectedRequestType is invalid " +

        "towards the end of handleRequest! - \"" + expectedRequestType + "\"");

     return;

   }

   response.finish();

 }