/* -*- 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) {
ERR(
response,
400,
"Bad Request",
'Should not receive "Range: ' + range + '" for first, full request.'
);
return;
}
if (ifRange && ifRange.length) {
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.
let 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();
}
