add offers and hasCourseInstance to course jsonld #173

app/framework/seo.js

@@ -17,6 +17,8 @@ export function setJsonLd(allEvents) {
             course['name'] = event.Designation;
             course['description'] = getDescription(event);
             course['courseCode'] = event.Number;
+            course['offers'] = [{type: 'Offer', category: event.Price > 0 ? 'Paid' : 'Free', price: event.Price}];
+            course['hasCourseInstance'] = [{type: 'CourseInstance',courseMode: 'Blended', courseWorkload: millisecondsToISO8601Duration(Math.abs(event.From - event.To)) }];
             course['provider'] = {type: 'Organization', name: event.Host};
             course['url'] = getRootModulUrl() + '#/uid/' + event.Id;
 
@@ -37,4 +39,54 @@ function getDescription(event){
         description = description + text.label + ':' + text.memo + ';';
     });
     return description;
-}
+}
+
+/**
+ * https://github.com/wking/milliseconds-to-iso-8601-duration/tree/master
+ * @param {*} milliseconds 
+ * @returns 
+ */
+function millisecondsToISO8601Duration(milliseconds) {
+		if (milliseconds == 0) {
+			return 'P0D';
+		}
+		var offset = Math.floor(milliseconds);
+		var days = 0;
+		if (offset < 0) {
+			days = Math.floor(offset % 86400000);
+			offset -= 86400000 * days;
+		}
+		var milliseconds = offset % 1000;
+		offset = Math.floor(offset / 1000);
+		var seconds = offset % 60;
+		offset = Math.floor(offset / 60);
+		var minutes = offset % 60;
+		offset = Math.floor(offset / 60);
+		var hours = offset % 24;
+		days += Math.floor(offset / 24);
+		var parts = ['P'];
+		if (days) {
+			parts.push(days + 'D');
+		}
+		if (hours || minutes || seconds || milliseconds) {
+			parts.push('T');
+			if (hours) {
+				parts.push(hours + 'H');
+			}
+			if (minutes) {
+				parts.push(minutes + 'M');
+			}
+			if (seconds || milliseconds) {
+				parts.push(seconds);
+				if (milliseconds) {
+					milliseconds = milliseconds.toString();
+					while (milliseconds.length < 3) {
+						milliseconds = '0' + milliseconds;
+					}
+					parts.push('.' + milliseconds);
+				}
+				parts.push('S');
+			}
+		}
+		return parts.join('')
+}