Class: Canonical::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/rack-canonical-header/middleware.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/rack-canonical-header/middleware.rb', line 3

def initialize(app)
  @app = app
  @status, @headers, @body = nil
end

Class Method Details

.canonical_tag(env, canonical_host) ⇒ Object 



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# File 'lib/rack-canonical-header/middleware.rb', line 18

def self.canonical_tag(env, canonical_host)
  url_scheme = env['HTTP_X_FORWARDED_PROTO'] || env['rack.url_scheme']
  canonical = "#{url_scheme}://#{canonical_host}#{env['ORIGINAL_FULLPATH']}"
  "<#{canonical}>; rel=\"canonical\""
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack-canonical-header/middleware.rb', line 8

def call(env)
  @status, @headers, @body = @app.call(env)
  canonical_host = ENV['CANONICAL_HOST']
  return [@status, @headers, @body] unless html? && canonical_host

  @headers['Link'] = Middleware.canonical_tag(env, canonical_host)

  [@status, @headers, @body]
end