Use url.Parse instead of govalidator for detecting links

transform/links.go

@@ -1,6 +1,13 @@
 package transform
 
-import "github.com/asaskevich/govalidator"
+import "net/url"
+
+// list of URI schema which we turn into links in the UI
+var schemes = []string{
+	"ftp",
+	"http",
+	"https",
+}
 
 // DetectLinks takes alert annotation dict and returns two dicts:
 // first with regular annotations
@@ -10,7 +17,10 @@ func DetectLinks(sourceAnnotations map[string]string) (map[string]string, map[st
 	annotations := make(map[string]string)
 
 	for k, v := range sourceAnnotations {
-		if govalidator.IsURL(v) {
+		u, err := url.Parse(v)
+		if err != nil {
+			annotations[k] = v
+		} else if stringInSlice(schemes, u.Scheme) {
 			links[k] = v
 		} else {
 			annotations[k] = v