Addded validates_attachment_width and validates_attachment_height

lib/paperclip.rb

@@ -166,6 +166,64 @@ def has_attached_file name, options = {}
         value.send(:flush_errors) unless value.valid?
       end
     end
+
+
+    # Places ActiveRecord-style validations on the height of the file assigned. The
+    # possible options are:
+    # * +in+: a Range of bytes (i.e. +1..1.megabyte+),
+    # * +less_than+: equivalent to :in => 0..options[:less_than]
+    # * +greater_than+: equivalent to :in => options[:greater_than]..Infinity
+    # * +message+: error message to display, use :min and :max as replacements
+    def validates_attachment_height name, options = {}
+      attachment_definitions[name][:validations] << lambda do |attachment, instance|
+        unless options[:greater_than].nil?
+          options[:in] = (options[:greater_than]..(1/0)) # 1/0 => Infinity
+        end
+        unless options[:less_than].nil?
+          options[:in] = (0..options[:less_than])
+        end
+
+        if attachment.file? && !options[:in].include?(instance[:"#{name}_height"].to_i)
+          min = options[:in].first
+          max = options[:in].last
+
+          if options[:message]
+            options[:message].gsub(/:min/, min.to_s).gsub(/:max/, max.to_s)
+          else
+            "height is not between #{min} and #{max} bytes."
+          end
+        end
+      end
+    end
+
+
+    # Places ActiveRecord-style validations on the width of the file assigned. The
+    # possible options are:
+    # * +in+: a Range of bytes (i.e. +1..1.megabyte+),
+    # * +less_than+: equivalent to :in => 0..options[:less_than]
+    # * +greater_than+: equivalent to :in => options[:greater_than]..Infinity
+    # * +message+: error message to display, use :min and :max as replacements
+    def validates_attachment_width name, options = {}
+      attachment_definitions[name][:validations] << lambda do |attachment, instance|
+        unless options[:greater_than].nil?
+          options[:in] = (options[:greater_than]..(1/0)) # 1/0 => Infinity
+        end
+        unless options[:less_than].nil?
+          options[:in] = (0..options[:less_than])
+        end
+
+        if attachment.file? && !options[:in].include?(instance[:"#{name}_width"].to_i)
+          min = options[:in].first
+          max = options[:in].last
+
+          if options[:message]
+            options[:message].gsub(/:min/, min.to_s).gsub(/:max/, max.to_s)
+          else
+            "width is not between #{min} and #{max} bytes."
+          end
+        end
+      end
+    end    
 
     # Places ActiveRecord-style validations on the size of the file assigned. The
     # possible options are:

test/paperclip_test.rb

@@ -136,8 +136,10 @@ class ::SubDummy < Dummy; end
     end
 
     [[:presence,      nil,                             "5k.png",   nil],
-     [:size,          {:in => 1..10240},               "5k.png",   "12k.png"],
+      [:size,          {:in => 1..10240},               "5k.png",   "12k.png"],
      [:size2,         {:in => 1..10240},               nil,        "12k.png"],
+     [:width,          {:in => 400..500},               "5k.png",   "50x50.png"],
+     [:height,          {:in => 60..70},               "5k.png",   "50x50.png"],
      [:content_type1, {:content_type => "image/png"},  "5k.png",   "text.txt"],
      [:content_type2, {:content_type => "text/plain"}, "text.txt", "5k.png"],
      [:content_type3, {:content_type => %r{image/.*}}, "5k.png",   "text.txt"],