Module: Audioproxy::Rails::BlobResolver::DiskLayout

Defined in:
lib/audioproxy/rails/blob_resolver.rb

Overview

The Disk service hides its layout behind DiskService#path_for: a file for key "wxyz9876" lives at Top Level Namespace/wx/yz/wxyz9876, under two subdirectories hashed out of the key itself. The proxy is handed the path relative to its own AP_LOCAL_ROOT, so the gem has to reproduce that rule — which makes it the one piece of private-ish Rails API this gem depends on, and the reason it lives alone in a module with a contract test against the real DiskService (D3).

Class Method Summary collapse

Class Method Details

.relative_path_for(key) ⇒ Object 



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# File 'lib/audioproxy/rails/blob_resolver.rb', line 121

def relative_path_for(key)
  string = String.try_convert(key)

  if string.nil? || string.empty?
    raise ArgumentError, "an ActiveStorage blob key must be a non-empty String, got #{key.inspect}"
  end

  reject_unsafe(string)

  # folder_for can produce an empty middle segment ("ab" gives "ab/"),
  # and a key may carry its own separators. DiskService never sees
  # either, because it hands the join to File.expand_path, which
  # collapses them; reproducing the layout means reproducing that
  # normalization too, or a key like "ab" resolves to "ab//ab" here
  # and "ab/ab" on disk. cleanpath is the collapse without expand_path's
  # trip through the actual filesystem root.
  Pathname.new(File.join(folder_for(string), string)).cleanpath.to_s.delete_prefix("/")
end