PukiWiki attach plugin filename length bookmarklet

gistfile1.js

javascript:(function(){
function checkUploadFile() {
	var maxLength = 100;
	function getHexNameString(s) {
		var enc = encodeURIComponent(s);
		var result = '';
		for (var i = 0; i < enc.length; i++) {
			if (enc.substr(i, 1) === '%') {
				result += enc.substr(i + 1, 2);
				i += 2;
			} else {
				var c = enc.charCodeAt(i) + 0x100;
				var cs = c.toString(16);
				result += cs.substr(cs.length - 2, 2).toUpperCase();
			}
		}
		return result;
	}
	function getAttachFileName(p, f) {
		return getHexNameString(p) + '_' + getHexNameString(f) + '.log';
	}
	var submitElement = null;
	var pageName = '';
	var fileLeafName = '';
	var fileE = document.getElementById('_p_attach_file');
	if (fileE.value != '') {
		if (fileE.value.match(/[\\\/]([^\\\/]+)$/)) {
			fileLeafName = RegExp.$1;
		}
	}
	var nodes = document.getElementsByTagName('input');
	for (var i = 0; i < nodes.length; i++) {
		var n = nodes[i];
		if (n.name == 'refer' && n.type == 'hidden') {
			pageName = n.value;
		} else if (n.type == 'submit') {
			submitElement = n;
			n.disabled = false;
		}
	}
	var aFileName = getAttachFileName(pageName, fileLeafName);
	var nameLength = aFileName.length;
	if (nameLength > maxLength) {
		submitElement.disabled = true;
	} else {
		submitElement.disabled = false;
	}
	alert('file: [' + nameLength + '] ' + pageName + ' - ' + fileLeafName);
	var warnLabelId = '___warnLabel';
	var warnLabel = document.getElementById(warnLabelId);
	if (warnLabel) {
		while (warnLabel.hasChildNodes()) {
			warnLabel.removeChild(warnLabel.lastChild);
		}
	} else {
		warnLabel =  document.createElement('span');
		warnLabel.id = warnLabelId;
	}
	if (nameLength > maxLength) {
		warnLabel.appendChild(document.createElement('br'));
		var expLabel = 'ファイル名が長すぎます! 添付できません (' 
			+ nameLength + '文字 > 最大' + maxLength + '文字)';
		warnLabel.appendChild(document.createTextNode(expLabel));
		warnLabel.appendChild(document.createElement('br'));
		warnLabel.appendChild(document.createTextNode('Page: ' + pageName));
		warnLabel.appendChild(document.createElement('br'));
		warnLabel.appendChild(document.createTextNode('File: ' + fileLeafName));
		warnLabel.appendChild(document.createElement('br'));
		warnLabel.appendChild(document.createTextNode('Internal filename: ' + aFileName));
		warnLabel.style.color = 'red';
		warnLabel.style.fontWeight = '';
	}
	var fileEnext = fileE.nextSibling;
	fileE.parentNode.insertBefore(warnLabel, fileEnext);
}
	var fileE = document.getElementById('_p_attach_file');
	if (fileE.attachEvent) {
		fileE.attachEvent('onchange', checkUploadFile);
	} else {
		fileE.addEventListener('change', checkUploadFile, false);
	}
})()