X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/26114a84293ea3fbcc5ef4adcf7900060716e62c..4259263d270a5e377009d20835a463551c708d82:/apps/workbench/app/helpers/collections_helper.rb

diff --git a/apps/workbench/app/helpers/collections_helper.rb b/apps/workbench/app/helpers/collections_helper.rb
index 7b548dfb84..25f2cb53e6 100644
--- a/apps/workbench/app/helpers/collections_helper.rb
+++ b/apps/workbench/app/helpers/collections_helper.rb
@@ -5,7 +5,69 @@ module CollectionsHelper
     end
   end
 
-  def self.match(uuid)
-    /^([a-f0-9]{32})(\+[0-9]+)?(\+.*?)?(\/.*)?$/.match(uuid.to_s)
+  ##
+  # Regex match for collection portable data hash, returns a regex match object with the
+  # hash in group 1, (optional) size in group 2, (optional) subsequent uuid
+  # fields in group 3, and (optional) file path within the collection as group
+  # 4
+  # returns nil for no match.
+  #
+  # +pdh+ the portable data hash string to match
+  #
+  def self.match(pdh)
+    /^([a-f0-9]{32})(\+\d+)(\+[^+]+)*?(\/.*)?$/.match(pdh.to_s)
+  end
+
+  ##
+  # Regex match for collection UUIDs, returns a regex match object with the
+  # uuid in group 1, empty groups 2 and 3 (for consistency with the match
+  # method above), and (optional) file path within the collection as group
+  # 4.
+  # returns nil for no match.
+  #
+  def self.match_uuid_with_optional_filepath(uuid_with_optional_file)
+    /^([0-9a-z]{5}-4zz18-[0-9a-z]{15})()()(\/.*)?$/.match(uuid_with_optional_file.to_s)
+  end
+
+  ##
+  # Regex match for common image file extensions, returns a regex match object
+  # with the matched extension in group 1; or nil for no match.
+  #
+  # +file+ the file string to match
+  #
+  def self.is_image file
+    /\.(jpg|jpeg|gif|png|svg)$/i.match(file)
+  end
+
+  ##
+  # Generates a relative file path than can be appended to the URL of a
+  # collection to get a file download link without adding a spurious ./ at the
+  # beginning for files in the default stream.
+  #
+  # +file+ an entry in the Collection.files list in the form [stream, name, size]
+  #
+  def self.file_path file
+    f0 = file[0]
+    f0 = '' if f0 == '.'
+    f0 = f0[2..-1] if f0[0..1] == './'
+    f0 += '/' if not f0.empty?
+    file_path = "#{f0}#{file[1]}"
+  end
+
+  ##
+  # Check if collection preview is allowed for the given filename with extension
+  #
+  def preview_allowed_for file_name
+    file_type = MIME::Types.type_for(file_name).first
+    if file_type.nil?
+      false
+    elsif (file_type.raw_media_type == "text") || (file_type.raw_media_type == "image")
+      true
+    elsif (file_type.raw_media_type == "application") &&
+          (Rails.configuration.application_mimetypes_with_view_icon.include? (file_type.sub_type))
+      true
+    else
+      false
+    end
   end
 end