1 files changed, 164 insertions, 0 deletions
diff --git a/web-ui/app/js/helpers/contenttype.js b/web-ui/app/js/helpers/contenttype.js
new file mode 100644
index 00000000..81519452
--- /dev/null
+++ b/web-ui/app/js/helpers/contenttype.js
@@ -0,0 +1,164 @@
+define([], function () {
+  var exports = {};
+
+  // Licence: PUBLIC DOMAIN <http://unlicense.org/>
+  // Author: Austin Wright <http://github.com/Acubed>
+
+  function MediaType(s, p){
+	this.type = '';
+	this.params = {};
+	if(typeof s=='string'){
+	  var c = splitQuotedString(s);
+	  this.type = c.shift();
+	  for(var i=0; i<c.length; i++){
+		this.parseParameter(c[i]);
+	  }
+	}else if(s instanceof MediaType){
+	  this.type = s.type;
+	  this.q = s.q;
+	  for(var n in s.params) this.params[n]=s.params[n];
+	}
+	if(typeof p=='string'){
+	  var c = splitQuotedString(p);
+	  for(var i=0; i<c.length; i++){
+		this.parseParameter(c[i]);
+	  }
+	}else if(typeof p=='object'){
+	  for(var n in p) this.params[n]=p[n];
+	}
+  }
+  MediaType.prototype.parseParameter = function parseParameter(s){
+	var param = s.split('=',1);
+	var name = param[0].trim();
+	var value = s.substr(param[0].length+1).trim();
+	if(!value || !name) return;
+	if(name=='q' && this.q===undefined){
+	  this.q=parseFloat(value);
+	}else{
+	  if(value[0]=='"' && value[value.length-1]=='"'){
+		value = value.substr(1, value.length-2);
+		value = value.replace(/\\(.)/g, function(a,b){return b;});
+	  }
+	  this.params[name]=value;
+	}
+  }
+  MediaType.prototype.toString = function toString(){
+	var str = this.type + ';q='+this.q;
+	for(var n in this.params){
+	  str += ';'+n+'=';
+	  if(this.params[n].match(/["=;<>\[\]\(\) ,\-]/)){
+		str += '"' + this.params[n].replace(/["\\]/g, function(a){return '\\'+a;}) + '"';
+	  }else{
+		str += this.params[n];
+	  }
+	}
+	return str;
+  }
+  exports.MediaType = MediaType;
+
+  // Split a string by character, but ignore quoted parts and backslash-escaped characters
+  function splitQuotedString(str, delim, quote){
+	delim = delim || ';';
+	quote = quote || '"';
+	var res = [];
+	var start = 0;
+	var offset = 0;
+	function findNextChar(v, c, i, a){
+	  var p = str.indexOf(c, offset+1);
+	  return (p<0)?v:Math.min(p,v);
+	}
+	while(offset>=0){
+	  offset = [delim,quote].reduce(findNextChar, 1/0);
+	  if(offset===1/0) break;
+	  switch(str[offset]){
+	  case quote:
+		// Skip to end of quoted string
+		while(1){
+		  offset=str.indexOf(quote, offset+1);
+		  if(offset<0) break;
+		  if(str[offset-1]==='\\') continue;
+		  break;
+		}
+		continue;
+	  case delim:
+		res.push(str.substr(start, offset-start).trim());
+		start = ++offset;
+		break;
+	  }
+	}
+	res.push(str.substr(start).trim());
+	return res;
+  }
+  exports.splitQuotedString = splitQuotedString;
+
+  // Split a list of content types found in an Accept header
+  // Maybe use it like: splitContentTypes(request.headers.accept).map(parseMedia)
+  function splitContentTypes(str){
+	return splitQuotedString(str, ',');
+  }
+  exports.splitContentTypes = splitContentTypes;
+
+  function parseMedia(str){
+	var o = new MediaType(str);
+	if(o.q===undefined) o.q=1;
+	return o;
+  }
+  exports.parseMedia = parseMedia;
+
+  // Pick an ideal representation to send given a list of representations to choose from and the client-preferred list
+  function select(reps, accept){
+	var cr = {q:0};
+	var ca = {q:0};
+	var cq = 0;
+	for(var i=0; i<reps.length; i++){
+	  var r = reps[i];
+	  var rq = r.q || 1;
+	  for(var j=0; j<accept.length; j++){
+		var a=accept[j];
+		var aq = a.q || 1;
+		var cmp = mediaCmp(a, r);
+		if(cmp!==null && cmp>=0){
+		  if(aq*rq>cq){
+			ca = a;
+			cr = r;
+			cq = ca.q*cr.q;
+			if(cq===1 && cr.type) return cr;
+		  }
+		}
+	  }
+	}
+	return cr.type&&cr;
+  }
+  exports.select = select;
+
+  // Determine if one media type is a subset of another
+  // If a is a superset of b (b is smaller than a), return 1
+  // If b is a superset of a, return -1
+  // If they are the exact same, return 0
+  // If they are disjoint, return null
+  function mediaCmp(a, b){
+	if(a.type==='*/*' && b.type!=='*/*') return 1;
+	else if(a.type!=='*/*' && b.type==='*/*') return -1;
+	var ac = (a.type||'').split('/');
+	var bc = (b.type||'').split('/');
+	if(ac[0]=='*' && bc[0]!='*') return 1;
+	if(ac[0]!='*' && bc[0]=='*') return -1;
+	if(a.type!==b.type) return null;
+	var ap = a.params || {};
+	var bp = b.params || {};
+	var ak = Object.keys(ap);
+	var bk = Object.keys(bp);
+	if(ak.length < bk.length) return 1;
+	if(ak.length > bk.length) return -1;
+	var k = ak.concat(bk).sort();
+	var dir = 0;
+	for(var n in ap){
+	  if(ap[n] && !bp[n]){ if(dir<0) return null; else dir=1; }
+	  if(!ap[n] && bp[n]){ if(dir>0) return null; else dir=-1; }
+	}
+	return dir;
+  }
+  exports.mediaCmp = mediaCmp;
+
+  return exports;
+});