michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=8 sts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* Debug and Error wrapper functions for dump().
michael@0:  */
michael@0: function ERR(response, responseCode, responseCodeStr, msg)
michael@0: {
michael@0:   // Reset state var.
michael@0:   setState("expectedRequestType", "");
michael@0:   // Dump to console log and send to client in response.
michael@0:   dump("SERVER ERROR: " + msg + "\n");
michael@0:   response.write("HTTP/1.1 " + responseCode + " " + responseCodeStr + "\r\n");
michael@0:   response.write("Content-Type: text/html; charset=UTF-8\r\n");
michael@0:   response.write("Content-Length: " + msg.length + "\r\n");
michael@0:   response.write("\r\n");
michael@0:   response.write(msg);
michael@0: }
michael@0: 
michael@0: function DBG(msg)
michael@0: {
michael@0:   // Dump to console only.
michael@0:   dump("SERVER DEBUG: " + msg + "\n");
michael@0: }
michael@0: 
michael@0: /* Delivers content in parts to test partially cached content: requires two
michael@0:  * requests for the same resource.
michael@0:  *
michael@0:  * First call will respond with partial content, but a 200 header and
michael@0:  * Content-Length equal to the full content length. No Range or If-Range
michael@0:  * headers are allowed in the request.
michael@0:  *
michael@0:  * Second call will require Range and If-Range in the request headers, and
michael@0:  * will respond with the range requested.
michael@0:  */
michael@0: function handleRequest(request, response)
michael@0: {
michael@0:   DBG("Trying to seize power");
michael@0:   response.seizePower();
michael@0: 
michael@0:   DBG("About to check state vars");
michael@0:   // Get state var to determine if this is the first or second request.
michael@0:   var expectedRequestType;
michael@0:   var lastModified;
michael@0:   if (getState("expectedRequestType") === "") {
michael@0:     DBG("First call: Should be requesting full content.");
michael@0:     expectedRequestType = "fullRequest";
michael@0:     // Set state var for second request.
michael@0:     setState("expectedRequestType", "partialRequest");
michael@0:     // Create lastModified variable for responses.
michael@0:     lastModified = (new Date()).toUTCString();
michael@0:     setState("lastModified", lastModified);
michael@0:   } else if (getState("expectedRequestType") === "partialRequest") {
michael@0:     DBG("Second call: Should be requesting undelivered content.");
michael@0:     expectedRequestType = "partialRequest";
michael@0:     // Reset state var for first request.
michael@0:     setState("expectedRequestType", "");
michael@0:     // Get last modified date and reset state var.
michael@0:     lastModified = getState("lastModified");
michael@0:   } else {
michael@0:     ERR(response, 500, "Internal Server Error",
michael@0:         "Invalid expectedRequestType \"" + expectedRequestType + "\"in " +
michael@0:         "server state db.");
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   // Look for Range and If-Range
michael@0:   var range = request.hasHeader("Range") ? request.getHeader("Range") : "";
michael@0:   var ifRange = request.hasHeader("If-Range") ? request.getHeader("If-Range") : "";
michael@0: 
michael@0:   if (expectedRequestType === "fullRequest") {
michael@0:     // Should not have Range or If-Range in first request.
michael@0:     if (range && range.length > 0) {
michael@0:       ERR(response, 400, "Bad Request",
michael@0:           "Should not receive \"Range: " + range + "\" for first, full request.");
michael@0:       return;
michael@0:     }
michael@0:     if (ifRange && ifRange.length > 0) {
michael@0:       ERR(response, 400, "Bad Request",
michael@0:           "Should not receive \"Range: " + range + "\" for first, full request.");
michael@0:       return;
michael@0:     }
michael@0:   } else if (expectedRequestType === "partialRequest") {
michael@0:     // Range AND If-Range should both be present in second request.
michael@0:     if (!range) {
michael@0:       ERR(response, 400, "Bad Request",
michael@0:           "Should receive \"Range: \" for second, partial request.");
michael@0:       return;
michael@0:     }
michael@0:     if (!ifRange) {
michael@0:       ERR(response, 400, "Bad Request",
michael@0:           "Should receive \"If-Range: \" for second, partial request.");
michael@0:       return;
michael@0:     }
michael@0:   } else {
michael@0:     // Somewhat redundant, but a check for errors in this test code.
michael@0:     ERR(response, 500, "Internal Server Error",
michael@0:         "expectedRequestType not set correctly: \"" + expectedRequestType + "\"");
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   // Prepare content in two parts for responses.
michael@0:   var partialContent = "<html><head></head><body><p id=\"firstResponse\">" +
michael@0:                        "First response</p>";
michael@0:   var remainderContent = "<p id=\"secondResponse\">Second response</p>" +
michael@0:                          "</body></html>";
michael@0:   var totalLength = partialContent.length + remainderContent.length;
michael@0: 
michael@0:   DBG("totalLength: " + totalLength);
michael@0: 
michael@0:   // Prepare common headers for the two responses.
michael@0:   date = new Date();
michael@0:   DBG("Date: " + date.toUTCString() + ", Last-Modified: " + lastModified);
michael@0:   var commonHeaders = "Date: " + date.toUTCString() + "\r\n" +
michael@0:                       "Last-Modified: " + lastModified + "\r\n" +
michael@0:                       "Content-Type: text/html; charset=UTF-8\r\n" +
michael@0:                       "ETag: abcd0123\r\n" +
michael@0:                       "Accept-Ranges: bytes\r\n";
michael@0: 
michael@0: 
michael@0:   // Prepare specific headers and content for first and second responses.
michael@0:   if (expectedRequestType === "fullRequest") {
michael@0:     DBG("First response: Sending partial content with a full header");
michael@0:     response.write("HTTP/1.1 200 OK\r\n");
michael@0:     response.write(commonHeaders);
michael@0:     // Set Content-Length to full length of resource.
michael@0:     response.write("Content-Length: " + totalLength + "\r\n");
michael@0:     response.write("\r\n");
michael@0:     response.write(partialContent);
michael@0:   } else if (expectedRequestType === "partialRequest") {
michael@0:     DBG("Second response: Sending remaining content with a range header");
michael@0:     response.write("HTTP/1.1 206 Partial Content\r\n");
michael@0:     response.write(commonHeaders);
michael@0:     // Set Content-Length to length of bytes transmitted.
michael@0:     response.write("Content-Length: " + remainderContent.length + "\r\n");
michael@0:     response.write("Content-Range: bytes " + partialContent.length + "-" +
michael@0:                    (totalLength - 1) + "/" + totalLength + "\r\n");
michael@0:     response.write("\r\n");
michael@0:     response.write(remainderContent);
michael@0:   } else {
michael@0:     // Somewhat redundant, but a check for errors in this test code.
michael@0:     ERR(response, 500, "Internal Server Error",
michael@0:        "Something very bad happened here: expectedRequestType is invalid " +
michael@0:        "towards the end of handleRequest! - \"" + expectedRequestType + "\"");
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   response.finish();
michael@0: }