initial import for Open Source 🎉

static/js/services/meta-service.js

@@ -0,0 +1,48 @@
+/**
+ * Service which helps set the contents of the <meta> tags (and the <title> of a page).
+ */
+angular.module('quay').factory('MetaService', ['$interpolate', '$timeout', function($interpolate, $timeout) {
+  var metaService = {};
+
+  var interpolate = function(page, expr) {
+    if (!expr) {
+      return null;
+    }
+
+    var inter = $interpolate(expr, true, null, true);
+    if (!inter) {
+      return expr.toString();
+    }
+
+    return inter(page.scope);
+  };
+
+  var interpolationPromise = function(page, fieldGetter) {    
+    return new Promise(function(resolve, reject) {
+      if (!page || !page.$$route) {
+        resolve(null);
+        return;
+      }
+
+      if (page.scope) {
+        resolve(interpolate(page, fieldGetter()));
+        return;
+      }
+
+      // Timeout needed because page.scope is initially undefined.
+      $timeout(function() {
+        resolve(interpolationPromise(page, fieldGetter));
+      }, 10);
+    });
+  };
+
+  metaService.getTitle = function(page) {
+    return interpolationPromise(page, () =>  page.$$route.title);
+  };
+
+  metaService.getDescription = function(page) {
+    return interpolationPromise(page, () =>  page.$$route.description);
+  };
+
+  return metaService;
+}]);