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function zgGetContentTypeFromHeader() {
var nodes = document.getElementsByTagName("meta");
for (var i=0; i<nodes.length; i++)
{
var node = nodes[i];
if (!node.hasAttributes()) continue;
var http_equiv = node.getAttribute("http-equiv");
if (http_equiv && http_equiv.toLowerCase() == "content-type")
{
var content_type = node.getAttribute("content");
if (!content_type) continue;
return content_type.split(';')[0];
}
}
return null;
}
function zgGetDocumentInfo () {
var docInfo = {
"url": document.URL,
"origin": document.referrer,
"title": document.title
};
if (document.domain) {
docInfo["domain"] = document.location.protocol + "//" + document.domain;
}
var contentType = zgGetContentTypeFromHeader();
if (contentType) {
docInfo["mimeType"] = contentType;
chrome.extension.sendRequest(docInfo);
} else {
// send extra request to get the mime type
var request = new XMLHttpRequest();
request.open("HEAD", document.URL, true);
request.onreadystatechange=function() {
if (request.readyState==4) {
var content = request.getResponseHeader("Content-Type");
if (!content) return;
docInfo["mimeType"] = content.split(';')[0];
chrome.extension.sendRequest(docInfo);
}
}
request.send(null);
}
}
/*
function zgReadyStateChanged () {
console.log("ready state change fired! " + document.readyState);
if (document.readyState == "complete") {
zgGetDocumentInfo();
document.removeEventListener("readystatechange", zgReadyStateChanged, false);
}
}*/
function zgTimeoutElapsed () {
if (document.readyState == "complete") {
zgGetDocumentInfo();
} else {
window.setTimeout(zgTimeoutElapsed, 1000);
}
}
if (document.readyState != "complete") {
// in a perfect world this would work
//document.addEventListener("readystatechange", zgReadyStateChanged, false);
// in real world we have to be nasty
window.setTimeout(zgTimeoutElapsed, 1000);
} else {
zgGetDocumentInfo();
}
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