Java Lab: add helper to get all project files

dashboard/app/helpers/javalab_files_helper.rb

@@ -0,0 +1,57 @@
+
+module JavalabFilesHelper
+  # Get all files related to the project at the given channel id as a hash. The hash is in the format
+  # below. All values are StringIO.
+  # {
+  #   "sources": {"main.json": <main source file for a project>, "grid.txt": <serialized maze if it exists>},
+  #   "assets": {"asset_name_1": <asset_value>, ...}
+  #   "validation": <all validation code for a project, in json format>
+  # }
+  # If the channel doesn't have validation and/or a maze, those fields will not be present.
+  def self.get_project_files(channel_id)
+    storage_id, storage_app_id = storage_decrypt_channel_id(channel_id)
+    all_files = {}
+    sources = {}
+    # get main.json
+    source_data = SourceBucket.new.get(channel_id, "main.json")
+    # Note: we can call .string on this value (and all other values for files) to get the raw string.
+    sources["main.json"] = source_data[:body]
+
+    # get maze file
+    channel = ChannelToken.where(storage_app_id: storage_app_id, storage_id: storage_id).first
+    level = Level.cache_find(channel.level_id)
+    if level
+      serialized_maze = level.try(:get_serialized_maze)
+      if serialized_maze
+        sources["grid.txt"] = StringIO.new(serialized_maze.to_s)
+      end
+    end
+    all_files["sources"] = sources
+
+    # get level assets
+    assets = {}
+    asset_bucket = AssetBucket.new
+    asset_list = asset_bucket.list(channel_id)
+    asset_list.each do |asset|
+      assets[asset[:filename]] = asset_bucket.get(channel_id, asset[:filename])[:body]
+    end
+
+    # get starter assets
+    if level
+      starter_asset_bucket = Aws::S3::Bucket.new(LevelStarterAssetsController::S3_BUCKET)
+      (level&.project_template_level&.starter_assets || level.starter_assets || []).map do |friendly_name, uuid_name|
+        filename = "#{LevelStarterAssetsController::S3_PREFIX}#{uuid_name}"
+        asset = starter_asset_bucket.object(filename)
+        assets[friendly_name] = asset.get.body
+      end
+    end
+    all_files["assets"] = assets
+
+    # get validation code
+    if level.respond_to?(:validation) && level.validation
+      all_files["validation"] = StringIO.new(level.validation.to_json)
+    end
+
+    return all_files
+  end
+end