Module: Sinatra::Helpers

Included in:
Base
Defined in:
lib/sinatra/base.rb

Overview

Methods available to routes, before filters, and views.

Defined Under Namespace

Classes: StaticFile

Instance Method Summary collapse

Instance Method Details

#attachment(filename = nil) ⇒ Object

Set the Content-Disposition to “attachment” with the specified filename, instructing the user agents to prompt to save.



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# File 'lib/sinatra/base.rb', line 128

def attachment(filename=nil)
  response['Content-Disposition'] = 'attachment'
  if filename
    params = '; filename="%s"' % File.basename(filename)
    response['Content-Disposition'] << params
  end
end

#back ⇒ Object

Sugar for redirect (example: redirect back)



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# File 'lib/sinatra/base.rb', line 207

def back ; request.referer ; end

#body(value = nil, &block) ⇒ Object

Set or retrieve the response body. When a block is given, evaluation is deferred until the body is read with #each.



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# File 'lib/sinatra/base.rb', line 75

def body(value=nil, &block)
  if block_given?
    def block.each ; yield call ; end
    response.body = block
  else
    response.body = value
  end
end

#content_type(type, params = {}) ⇒ Object

Set the Content-Type of the response body given a media type or file extension.



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# File 'lib/sinatra/base.rb', line 115

def content_type(type, params={})
  media_type = self.media_type(type)
  fail "Unknown media type: %p" % type if media_type.nil?
  if params.any?
    params = params.collect { |kv| "%s=%s" % kv }.join(', ')
    response['Content-Type'] = [media_type, params].join(";")
  else
    response['Content-Type'] = media_type
  end
end

#error(code, body = nil) ⇒ Object

Halt processing and return the error status provided.



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# File 'lib/sinatra/base.rb', line 92

def error(code, body=nil)
  code, body    = 500, code.to_str if code.respond_to? :to_str
  response.body = body unless body.nil?
  halt code
end

#etag(value, kind = :strong) ⇒ Object

Set the response entity tag (HTTP ‘ETag’ header) and halt if conditional GET matches. The value argument is an identifier that uniquely identifies the current version of the resource. The strength argument indicates whether the etag should be used as a :strong (default) or :weak cache validator.

When the current request includes an ‘If-None-Match’ header with a matching etag, execution is immediately halted. If the request method is GET or HEAD, a ‘304 Not Modified’ response is sent.

Raises:

  • (TypeError) 


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# File 'lib/sinatra/base.rb', line 193

def etag(value, kind=:strong)
  raise TypeError, ":strong or :weak expected" if ![:strong,:weak].include?(kind)
  value = '"%s"' % value
  value = 'W/' + value if kind == :weak
  response['ETag'] = value

  # Conditional GET check
  if etags = env['HTTP_IF_NONE_MATCH']
    etags = etags.split(/\s*,\s*/)
    halt 304 if etags.include?(value) || etags.include?('*')
  end
end

#last_modified(time) ⇒ Object

Set the last modified time of the resource (HTTP ‘Last-Modified’ header) and halt if conditional GET matches. The time argument is a Time, DateTime, or other object that responds to to_time.

When the current request includes an ‘If-Modified-Since’ header that matches the time specified, execution is immediately halted with a ‘304 Not Modified’ response.



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# File 'lib/sinatra/base.rb', line 176

def last_modified(time)
  time = time.to_time if time.respond_to?(:to_time)
  time = time.httpdate if time.respond_to?(:httpdate)
  response['Last-Modified'] = time
  halt 304 if time == request.env['HTTP_IF_MODIFIED_SINCE']
  time
end

#media_type(type) ⇒ Object

Look up a media type by file extension in Rack’s mime registry.



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# File 'lib/sinatra/base.rb', line 109

def media_type(type)
  Base.media_type(type)
end

#not_found(body = nil) ⇒ Object

Halt processing and return a 404 Not Found.



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# File 'lib/sinatra/base.rb', line 99

def not_found(body=nil)
  error 404, body
end

#redirect(uri, *args) ⇒ Object

Halt processing and redirect to the URI provided.



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# File 'lib/sinatra/base.rb', line 85

def redirect(uri, *args)
  status 302
  response['Location'] = uri
  halt(*args)
end

#send_file(path, opts = {}) ⇒ Object

Use the contents of the file at path as the response body.



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# File 'lib/sinatra/base.rb', line 137

def send_file(path, opts={})
  stat = File.stat(path)
  last_modified stat.mtime

  content_type media_type(opts[:type]) ||
    media_type(File.extname(path)) ||
    response['Content-Type'] ||
    'application/octet-stream'

  response['Content-Length'] ||= (opts[:length] || stat.size).to_s

  if opts[:disposition] == 'attachment' || opts[:filename]
    attachment opts[:filename] || path
  elsif opts[:disposition] == 'inline'
    response['Content-Disposition'] = 'inline'
  end

  halt StaticFile.open(path, 'rb')
rescue Errno::ENOENT
  not_found
end

#session ⇒ Object

Access the underlying Rack session.



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# File 'lib/sinatra/base.rb', line 104

def session
  env['rack.session'] ||= {}
end

#status(value = nil) ⇒ Object

Set or retrieve the response status code.



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# File 'lib/sinatra/base.rb', line 68

def status(value=nil)
  response.status = value if value
  response.status
end