fixes #2526: Don't allow special characters ('*', etc...) in artist names

app/models/artist.rb

@@ -5,6 +5,7 @@ class Artist < ActiveRecord::Base
   after_save :save_url_string
   after_save :categorize_tag
   validates_uniqueness_of :name
+  validate :name_is_valid
   belongs_to :creator, :class_name => "User"
   has_many :members, :class_name => "Artist", :foreign_key => "group_name", :primary_key => "name"
   has_many :urls, :dependent => :destroy, :class_name => "ArtistUrl"
@@ -85,6 +86,18 @@ class Artist < ActiveRecord::Base
       end
     end
 
+    def name_is_valid
+      if name =~ /^[-~]/
+        errors[:name] << "cannot begin with - or ~"
+        false
+      elsif name =~ /\*/
+        errors[:name] << "cannot contain *"
+        false
+      else
+        true
+      end
+    end
+
     def normalize_name
       self.name = Artist.normalize_name(name)
     end