Class: Rex::Proto::Http::Handler::Erb

Inherits:
Rex::Proto::Http::Handler show all
Defined in:
lib/rex/proto/http/handler/erb.rb

Overview

This class implements a handler for ERB (.rhtml) template files. This is based off the webrick handler.

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Rex::Proto::Http::Handler

#relative_resource_required?

Constructor Details

#initialize(server, root_path, opts = {}) ⇒ Erb

Initializes the ERB handler


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# File 'lib/rex/proto/http/handler/erb.rb', line 28

def initialize(server, root_path, opts = {})
  super(server)

  self.root_path = root_path
  self.opts = opts

  self.opts['MimeType'] = "text/html" unless self.opts['MimeType']
end

Class Method Details

.relative_resource_required?Boolean

ERB handlers required a relative resource so that the full path name can be computed.

Returns:

  • (Boolean)

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# File 'lib/rex/proto/http/handler/erb.rb', line 21

def self.relative_resource_required?
  true
end

Instance Method Details

#evaluate(erb, cli, request, response) ⇒ Object

Evaulates the ERB context in a specific binding context.


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# File 'lib/rex/proto/http/handler/erb.rb', line 107

def evaluate(erb, cli, request, response)
  # If the thing that created this handler wanted us to use a callback
  # instead of the default behavior, then let's do that.
  if (opts['ErbCallback'])
    opts['ErbCallback'].call(erb, cli, request, response)
  else
    Module.new.module_eval {
      query_string = request.qstring
      meta_vars = request.meta_vars
      erb.result(binding)
    }
  end
end

#on_request(cli, req) ⇒ Object

Called when a request arrives.


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# File 'lib/rex/proto/http/handler/erb.rb', line 40

def on_request(cli, req)
  resource = req.relative_resource

  # Make sure directory traversals aren't happening
  if (resource =~ /\.\./)
    wlog("Erb::on_request: Dangerous request performed: #{resource}",
      LogSource)
    return
  # If the request is for the root directory, use the document index file.
  elsif (resource == '/')
    resource << opts['DocumentIndex'] || 'index.rhtml'
  end

  begin
    resp = Response.new

    # Calculate the actual file path on disk.
    file_path = root_path + resource

    # Serialize the contents of the file
    data = ''

    File.open(file_path, 'rb') { |f|
      data = f.read
    }

    # Set the content-type to text/html by default.  We do this before
    # evaluation so that the script can change it.
    resp['Content-Type'] = server ? server.mime_type(resource) : 'text/html'

    # If the requested file is a ruby html file, evaluate it.
    if (File.extname(file_path) == ".rhtml")
      # Evaluate the data and set the output as the response body.
      resp.body = evaluate(ERB.new(data), cli, req, resp)
    # Otherwise, just set the body to the data that was read.
    else
      resp.body = data
    end
  rescue Errno::ENOENT
    server.send_e404(cli, req)
  rescue
    elog("Erb::on_request: #{$!}\n#{[email protected].join("\n")}", LogSource)

    resp.code    = 500
    resp.message = "Internal Server Error"
    resp.body =
      "<html><head>" +
      "<title>Internal Server Error</title>" +
      "</head><body> " +
      "<h1>Internal Server Error</h1>" +
      "The server encountered an error:<br/><br/> <b>" + html_escape($!) + "</b><br/><br/>" +
      "Stack trace:<br/><br/>" +
      [email protected].map { |e| html_escape(e.to_s) }.join("<br/>") +
      "</body></html>"
  end

  # Send the response to the
  if (cli and resp)
    cli.send_response(resp)
  end

  resp
end