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const DEBUG_all_valid = false;
const DEBUG_all_stub = false;
function handleRequest(request, response)
{
// Decode the query string to know what test we're doing.
// character 1: 'I' = text/css response, 'J' = text/html response
let responseCSS = (request.queryString[0] == 'I');
// character 2: redirection type - we only care about whether we're
// ultimately same-origin with the requesting document ('A', 'D') or
// not ('B', 'C').
let sameOrigin = (request.queryString[1] == 'A' ||
request.queryString[1] == 'D');
// character 3: '1' = syntactically valid, '2' = invalid, '3' = http error
let malformed = (request.queryString[2] == '2');
let httpError = (request.queryString[2] == '3');
// character 4: loaded with <link> or @import (no action required)
// character 5: loading document mode: 'q' = quirks, 's' = standards
let quirksMode = (request.queryString[4] == 'q');
// Our response contains a CSS rule that selects an element whose
// ID is the first four characters of the query string.
let selector = '#' + request.queryString.substring(0,4);
// "Malformed" responses wrap the CSS rule in the construct
// <html>{} ... </html>
// This mimics what the CSS parser might see if an actual HTML
// document were fed to it. Because CSS parsers recover from
// errors by skipping tokens until they find something
// recognizable, a style rule appearing where I wrote '...' above
// will be honored!
let leader = (malformed ? '<html>{}' : '');
let trailer = (malformed ? '</html>' : '');
// Standards mode documents will ignore the style sheet if it is being
// served as text/html (regardless of its contents). Quirks mode
// documents will ignore the style sheet if it is being served as
// text/html _and_ it is not same-origin. Regardless, style sheets
// are ignored if they come as the body of an HTTP error response.
//
// Style sheets that should be ignored paint the element red; those
// that should be honored paint it lime.
let color = ((responseCSS || (quirksMode && sameOrigin)) && !httpError
? 'lime' : 'red');
// For debugging the test itself, we have the capacity to make every style
// sheet well-formed, or every style sheet do nothing.
if (DEBUG_all_valid) {
// In this mode, every test chip should turn blue.
response.setHeader('Content-Type', 'text/css');
response.write(selector + '{background-color:blue}\n');
} else if (DEBUG_all_stub) {
// In this mode, every test chip for a case where the true test
// sheet would be honored, should turn red.
response.setHeader('Content-Type', 'text/css');
response.write(selector + '{}\n');
} else {
// Normal operation.
if (httpError)
response.setStatusLine(request.httpVersion, 500,
"Internal Server Error");
response.setHeader('Content-Type',
responseCSS ? 'text/css' : 'text/html');
response.write(leader + selector +
'{background-color:' + color + '}' +
trailer + '\n');
}
}
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