5 response building define response elements

[gwolf-011235]

Overview

Adds basic functionality to create HTTP response based on a HTTP request. Right now only base functionality is supported

• GET method
• Default Error pages
• Single string index
• MIME types are hardcoded

1 ResponseBuilder

This is the main class of this PR. It is designed to be instantiated once and then reused for every response.

• It receives the ConfigFile. The active Server is set via Setter (how the active server is chosen is not implemented yet)
• With buildResponse() a HTTP request will be translated to a response, which can be retrieved with getResponse()
• Response building is passed to subclasses TargetResourceHandler and ResponseBodyHandler. Last step is adding Statusline and Headers and body.
• Class has a Stringstream which is reused by reset() before building the next response.

2 TargetResourceHandler

The responsibility of this class is to locate the target resource.

• Receives a vector of locations which are searched for the longest matching path
• The located file is then checked for its type (regular, directory, not existing) and actions are taken
• A HTTP response is passed as ref, to set targetResource, status, autindex and location

3 ResponseBodyHandler

The responsibility of this class is to create the body depending on the located target resource.

• if HTTP response has error constructs error page
• if autoindex is true constructs autoindex with class AutoindexHandler
• if method is GET reads the file

4 AutoindexHandler

The responsibility of this class is to create an autoindex page

• Receives a directory and builds a autoindex page with a table consisting of file name, size and last modified
• Returns an empty string if error

5 Helper classes

• Directory: encapsulates opening and closing of directory
• FileSystemPolicy: wraps C functions for the file system (mainly stat and directory related). THis makes for easier testing via a MockFileSystemPolicy

6 utils

New utils function:

• getFileExtension - get file extension
• getGMTString - get time string in greenwich meantime
• getLocaltimeString - get time string in localtime
• statusCodeToReasonPhrase - transform status code to reason phrase
• getDefaultErrorPage - construct default error page depending on status code

Tests

Included testfiles for AutoindexHandler, ResponseBodyBuilder, TargetResourceBuilder and utils using google mock Adapted Makefile to compile tests.