Admin Edit Link for Shopify

admin-edit-link.liquid

<!-- /snippets/admin-edit-link.liquid -->
{% capture CFH %}{{ content_for_header  }}{% endcapture %}{{ CFH }}

{% if CFH contains 'admin_bar_iframe' %}
	{% assign admin = true %}
{% endif %}

{% if admin %}
	<script>
		(function(){
			var lang = {
				'no':'Sorry, but you cannot use this here.',
				'not_json':'That does not look like json.'
			};
			var isJson = function(a) {
				try { JSON.parse(a) } catch (e) { return false }
				return true;
			};
			var nope = function(a){
				if(typeof a === 'undefined'){ var a = lang.no }
				console.warn(a)
				return false
			}
			var getJsonPath = function(){
				return [location.protocol, '//', location.host,location.pathname,'.json'].join('')
			};
			var getJson = function(u,c){
				var req = new XMLHttpRequest();
				req.open('GET', u, false); 
				req.onreadystatechange = function() {
					if (req.readyState == 4 && req.status == 200) {
						if(typeof c === 'function'){
							if(!isJson(req.responseText)){ return nope(lang.not_json) }
							var json = JSON.parse(req.responseText);
							c(json,Object.keys(json)[0]);
						}
					}
				};
				req.send();
			};
			var button = document.createElement('a');
			button.id = 'edit-link';
			button.style = '';
			button.innerHTML = 'EDIT';
			button.addEventListener('click',function(e){
				e.target.blur();
				if(location.pathname === '/'){ return nope() }
				if(location.pathname.split('/')[1] === 'blogs'){
					/* fallback to the tracking script data, should it exist */
					if(typeof __st !== 'undefined' && __st.s){
						location.href = [location.protocol, '//', location.host,'/admin/articles/',__st.s.split('-')[1]].join('');
						return false;
					}
					return nope()
				}
				getJson(getJsonPath(),function(a,b){
					location.href = [location.protocol, '//', location.host,'/admin/',b+'s/',a[b].id].join('');
				})
				return false;
			});
			document.getElementsByTagName('body')[0].appendChild(button);
		})()
	</script>
{% else %}
	<!-- User is not an admin -->
{% endif %}