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