Module: Wmap::Utils::UrlMagic

Extended by:
UrlMagic
Included in:
Wmap::Utils, UrlMagic
Defined in:
lib/wmap/utils/url_magic.rb

Constant Summary collapse

Max_http_timeout =

set hard stop limit of http time-out to 8 seconds, in order to avoid severe performance penalty for certain ‘weird’ site(s)

8000

Instance Method Summary collapse

Instance Method Details

#create_absolute_url_from_base(potential_base, relative_url) ⇒ Object

Create / construct the absolute URL from a known URL and relative file path. For example, ‘images.search.yahoo.com/images’ + ‘/search/images?p=raiders’ => ‘images.search.yahoo.com/search/images?p=raiders’



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# File 'lib/wmap/utils/url_magic.rb', line 250

def create_absolute_url_from_base(potential_base, relative_url)
    begin
			#puts "Determine the absolute URL from potential base #{potential_base} and relative URL #{relative_url}" if @verbose
			naked_base = url_2_site(potential_base).strip.chop
			puts "Found absolute URL: #{naked_base+relative_url}" if @verbose
			return naked_base + relative_url
    rescue => ee
			puts "Exception on method #{__method__}: #{ee}" if @verbose
        return nil
    end
end

#create_absolute_url_from_context(potential_base, relative_url) ⇒ Object

Construct the absolute URL by comparing a known URL and the relative file path



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# File 'lib/wmap/utils/url_magic.rb', line 263

def create_absolute_url_from_context(potential_base, relative_url)
    puts "Determine the absolute URL from context:\n Known base: #{potential_base}, Relative path: #{relative_url}" if @verbose
		begin
			absolute_url = nil
			# make relative URL naked by removing the beginning '/'
			relative_url.sub!(/^\//,'')
			if potential_base =~ /\/$/
absolute_url = potential_base+relative_url.strip
			else
last_index_of_slash = potential_base.rindex('/')
if potential_base[last_index_of_slash-2, 2] == ':/'
	absolute_url = potential_base+relative_url
else
	last_index_of_dot = potential_base.rindex('.')
	if last_index_of_dot < last_index_of_slash
		absolute_url = potential_base.strip.chop+relative_url
	else
		absolute_url = potential_base[0, last_index_of_slash+1] + relative_url
	end
end
			end
			puts "Found absolute URL: #{absolute_url}" if @verbose
			return absolute_url
    rescue => ee
			puts "Exception on method #{__method__}: #{ee}" if @verbose
        return nil
    end
end

#host_2_url(host, port = 80) ⇒ Object

Input is host and open port, output is a URL for valid http response code or nil



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# File 'lib/wmap/utils/url_magic.rb', line 201

def host_2_url (host,port=80)
	puts "Perform simple http(s) service detection on host #{host}, port #{port}" if @verbose
	begin
		host=host.strip
		if port.to_i == 80
			url_1 = "http://" + host + "/"
		elsif port.to_i ==443
			url_1 = "https://" + host + "/"
		else
			url_1 = "http://" + host + ":" + port.to_s + "/"
			url_2 = "https://" + host + ":" + port.to_s + "/"
		end
		puts "Please ensure your internet connection is active before running this method: #{__method__}" if @verbose
		checker=Wmap::UrlChecker.new
		if checker.response_code(url_1) != 10000
			puts "Found URL: #{url_1}" if @verbose
			return url_1
		elsif checker.response_code(url_2) != 10000
			puts "Found URL: #{url_2}" if @verbose
			return url_2
		else
			puts "No http(s) service found on: #{host}:#{port}" if @verbose
			return nil
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return nil
	end
end

#is_site?(url) ⇒ Boolean

Simple sanity check on a ‘claimed’ web site base string.

Returns:

  • (Boolean) 


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# File 'lib/wmap/utils/url_magic.rb', line 59

def is_site?(url)
	puts "Validate the website string format for: #{url}" if @verbose
	begin
		url=url.strip.downcase
		if is_url?(url)
			if url == url_2_site(url)
				return true
			else
				return false
			end
		else
			puts "Unknown site format: #{url}" if @verbose
			return false
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return nil
	end
end

#is_ssl?(url) ⇒ Boolean Also known as: is_https?

Simple sanity check on a ‘claimed’ SSL enabled URL string

Returns:

  • (Boolean) 


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# File 'lib/wmap/utils/url_magic.rb', line 42

def is_ssl?(url)
	puts "Validate if SSL is enabled on: #{url}" if @verbose
	begin
		url=url.strip
		if is_url?(url) && url =~ /https/i
			return true
		else
			return false
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return false
	end
end

#is_url?(url) ⇒ Boolean

Simple sanity check on a ‘claimed’ URL string.

Returns:

  • (Boolean) 


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# File 'lib/wmap/utils/url_magic.rb', line 20

def is_url?(url)
	puts "Validate the URL format is valid: #{url}" if @verbose
	begin
		if url =~ /(http|https)\:\/\/((.)+)/i
			host=$2.split('/')[0]
			host=host.split(':')[0]
			if is_ip?(host) or is_fqdn?(host)
				return true
			else
				return false
			end
		else
			puts "Unknown URL format: #{url}" if @verbose
			return false
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return false
	end
end

#landing_location(depth = 5, url) ⇒ Object

Test the URL / Site and return the landing url location (recursive with the depth = 4 )



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# File 'lib/wmap/utils/url_magic.rb', line 431

def landing_location (depth=5, url)
	depth -= 1
	return url if depth < 1
	timeo = Max_http_timeout/1000.0
	uri = URI.parse(url)
	code = response_code (url)
	if code >= 300 && code < 400
		url = redirect_location (url)
		url = landing_location(depth,url)
	else
		return url
	end
	return url
rescue Exception => ee
	puts "Exception on method #{__method__} on URL #{url}: #{ee}" if @verbose
end

#make_absolute(base, relative_url) ⇒ Object

Convert a relative URL to an absolute one. For example, from URL base ‘games.yahoo.com/’ and file path ‘/game/the-magic-snowman-flash.html’ => ‘games.yahoo.com/game/the-magic-snowman-flash.html’



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# File 'lib/wmap/utils/url_magic.rb', line 232

def make_absolute(base, relative_url)
    puts "Determine and return the absolute URL:\n Base: #{base}, Relative: #{relative_url} " if @verbose
		begin
			absolute_url = nil;
			if relative_url =~ /^\//
absolute_url = create_absolute_url_from_base(base, relative_url)
			else
absolute_url = create_absolute_url_from_context(base, relative_url)
			end
			puts "Found absolute URL: #{absolute_url}" if @verbose
			return absolute_url
    rescue => ee
			puts "Exception on method #{__method__}: #{ee}" if @verbose
        return nil
    end
end

#normalize_url(url) ⇒ Object

Normalize the URL to a consistent manner in order to determine if a link has been visited or cached before See en.wikipedia.org/wiki/URL_normalization for more explanation



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# File 'lib/wmap/utils/url_magic.rb', line 294

def normalize_url(url)
	begin
		url.strip!
		# Converting the scheme and host to lower case in the process, i.e. 'HTTP://www.Example.com/' => 'http://www.example.com/'
		# Normalize the base
		base=url_2_site(url)
		# Case#1, remove the trailing dot after the hostname, i.e, 'http://www.yahoo.com./' => 'http://www.yahoo.com/'
		base=base.sub(/\.\/$/,'/')
		# Normalize the relative path, case#1
		# retrieve the file path and remove the first '/' or '.',
		# i.e. 'http://www.example.com/mypath' or 'http://www.example.com/./mypath' => 'mypath'
		path=url_2_path(url).sub(/^(\/|\.)*/,'')
		# Normalize the relative path, case#2
		# Replace dot-segments. "/../" and "/./" with "/", i.e. 'http://www.example.com/../a/b/../c/./d.html" => 'http://www.example.com/a/c/d.html'
		path=path.gsub(/\/\.{1,2}\//,'/')
		if path.nil?
			return base
		else
			return base+path
		end
	rescue => ee
		puts "Exception on method #{__method__} for #{url}: #{ee}" if @verbose
		return url
	end
end

#open_page(url) ⇒ Object

Given an URL, open the page, then return the DOM text from a normal user perspective



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# File 'lib/wmap/utils/url_magic.rb', line 373

def open_page(url)
  args = {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE, allow_redirections: :safe, read_timeout: Max_http_timeout/1000}
  doc = Nokogiri::HTML(open(url, args))
  if doc.text.include?("Please enable JavaScript to view the page content")
    puts "Invoke headless chrome through webdriver ..." if @verbose
    #Selenium::WebDriver::Chrome.path = "/usr/local/bin/chromedriver"
    #driver = Selenium::WebDriver.for :chrome
    # http://watir.com/guides/chrome/
    args = ['--ignore-certificate-errors', '--disable-popup-blocking', '--disable-translate']
    browser = Watir::Browser.new :chrome, headless: true, options: {args: args}
    browser.goto(url)
    sleep(2) # wait for the loading
    doc = Nokogiri::HTML(browser.html)
    browser.close
  end
  puts doc.text if @verbose
  return doc
rescue => ee
  puts "Exception on method #{__method__} for #{url}: #{ee}"
  browser.close unless browser.nil?
  return doc.text
end

#redirect_location(url) ⇒ Object Also known as: location

Test the URL / site and return the redirection location (3xx response code only)



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# File 'lib/wmap/utils/url_magic.rb', line 397

def redirect_location (url)
	puts "Test the redirection location for the url: #{url}" if @verbose
	location=""
	raise "Invalid url: #{url}" unless is_url?(url)
	url=url.strip.downcase
	timeo = Max_http_timeout/1000.0
	uri = URI.parse(url)
	code = response_code (url)
	if code >= 300 && code < 400
		http = Net::HTTP.new(uri.host, uri.port)
		http.open_timeout = timeo
		http.read_timeout = timeo
		if (url =~ /https\:/i)
			http.use_ssl = true
			# Bypass the remote web server cert validation test
			http.verify_mode = OpenSSL::SSL::VERIFY_NONE
			http.ssl_version = @ssl_version
		end
		request = Net::HTTP::Get.new(uri.request_uri)
		response = http.request(request)
		puts "Response: #{response}" if @verbose
		case response
		when Net::HTTPRedirection then
			location = response['location']
		end
	end
	return location
rescue Exception => ee
	puts "Exception on method redirect_location for URL #{url}: #{ee}" if @verbose
	return ""
end

#response_code(url) ⇒ Object

Test the URL and return the response code



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# File 'lib/wmap/utils/url_magic.rb', line 322

def response_code (url)
	puts "Check the http response code on the url: #{url}" if @verbose
	code = 10000	# All unknown url connection exceptions go here
	raise "Invalid url: #{url}" unless is_url?(url)
	url=url.strip.downcase
	timeo = Max_http_timeout/1000.0
	uri = URI.parse(url)
	http = Net::HTTP.new(uri.host, uri.port)
	http.open_timeout = timeo
	http.read_timeout = timeo
	if (url =~ /https\:/i)
		http.use_ssl = true
		#http.ssl_version = :SSLv3
		# Bypass the remote web server cert validation test
		http.verify_mode = OpenSSL::SSL::VERIFY_NONE
	end
	request = Net::HTTP::Get.new(uri.request_uri)
	response = http.request(request)
	puts "Server response the following: #{response}" if @verbose
	code = response.code.to_i
	#response.finish if response.started?()
	@url_code=Hash.new unless @url_code
   @url_code[url]=code
	puts "Response code on #{url}: #{code}" if @verbose
	return code
rescue Exception => ee
	puts "Exception on method #{__method__} for #{url}: #{ee}" if @verbose
	case ee
	# rescue "Connection reset by peer" error type
	when Errno::ECONNRESET
		code=104
	when Errno::ECONNABORTED,Errno::ETIMEDOUT
		#code=10000
	when Timeout::Error				# Quick fix
		if (url =~ /https\:/i)		# try again for ssl timeout session, in case of default :TLSv1 failure
			http.ssl_version = :SSLv3
			response = http.request(request)
			code = response.code.to_i
			unless code.nil?
				@ssl_version = http.ssl_version
			end
		end
	else
		#code=10000
	end
   @url_code=Hash.new unless @url_code
	@url_code[url]=code
	return code
end

#url_2_host(url) ⇒ Object

Extract the web server host’s Fully Qualified Domain Name (FQDN) from the url. For example: “login.yahoo.com/email/help” -> “login.yahoo.com”



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# File 'lib/wmap/utils/url_magic.rb', line 80

def url_2_host (url)
	begin
		url = url.strip.downcase.gsub(/(http:\/\/|https:\/\/)/, "")
		record1 = url.split('/')
		if record1[0].nil?
			puts "Error process url: #{url}"
			return nil
		else
			record2 = record1[0].split(':')
			return record2[0]
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return nil
	end
end

#url_2_path(url) ⇒ Object

Wrapper to return relative path component of the URL. i.e. www.yahoo.com/login.html => /login.html



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# File 'lib/wmap/utils/url_magic.rb', line 175

def url_2_path(url)
	#puts "Retrieve the relative path component of the url: #{url}" if @verbose
	begin
		url.strip!
		base = url_2_site(url).chop
		path=url.sub(base,'')
		#puts "Path component found: #{path}" if @verbose
		return path
	rescue => ee
		puts "Exception on method #{__method__} for #{url}: #{ee}" if @verbose
	end

end

#url_2_port(url) ⇒ Object

Extract web service port from the url. For example: “login.yahoo.com/email/help” -> 443



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# File 'lib/wmap/utils/url_magic.rb', line 98

def url_2_port (url)
	puts "Retrieve service port on URL: #{url}" if @verbose
	begin
		ssl = (url =~ /https/i)
		url = url.downcase.gsub(/(http:\/\/|https:\/\/)/, "")
		record1 = url.split('/')
		record2 = record1[0].split(':')
		if (record2.length == 2)
			puts "The service port: #{record2[1]}" if @verbose
			return record2[1].to_i
		elsif ssl
			puts "The service port: 443" if @verbose
			return 443
		else
			puts "The service port: 80" if @verbose
			return 80
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return nil
	end
end

#url_2_site(url) ⇒ Object

Extract site in (host:port) format from a url: “login.yahoo.com:8443/email/help” -> “login.yahoo.com:8443/”



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# File 'lib/wmap/utils/url_magic.rb', line 122

def url_2_site (url)
	puts "Retrieve the web site base for url: #{url}" if @verbose
	begin
		url = url.downcase
		url = url.sub(/^(.*?)http/i,'http')
		entry = url.split(%r{\/\/})
		prot=entry[0]
		# step 1, extract the host:port pair from the url
		host_port=entry[1].split(%r{\/})[0]
		if host_port =~ /\:/
			host=host_port.split(%r{\:})[0]
			port=host_port.split(%r{\:})[1].to_i
		elsif prot =~ /https/i
			host=host_port
			port=443
		elsif prot =~ /http/i
			host=host_port
			port=80
		else
			host=host_port
			#raise "Unknown url format: #{url}"
		end
		# additional logic to handle uncommon url base structures
		unless is_fqdn?(host)
			case host
				# "https://letmechoose.barclays.co.uk?source=btorganic/" => "https://letmechoose.barclays.co.uk"
				when /\?|\#/
					host=host.split(%r{\?|\#})[0]
				else
					#do nothing
			end
		end
		# step 2, put the host:port pair back to the normal site format
		prot="https:" if port==443
		if port==80 || port==443
			site=prot+"//"+host+"/"
		else
			site=prot+"//"+host+":"+port.to_s+"/"
		end
		if site=~ /http/i
			#puts "Base found: #{site}" if @verbose
			return site
		else
			raise "Problem encountered on method url_2_site: Unable to convert #{url}"
			return nil
		end
	rescue => ee
		puts "Exception on method #{__method__}: #{ee}" if @verbose
		return nil
	end
end

#urls_on_same_domain?(url1, url2) ⇒ Boolean

Test if the two URLs are both under the same domain: login.yahoo.com, mail.yahoo.com => true

Returns:

  • (Boolean) 


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# File 'lib/wmap/utils/url_magic.rb', line 190

def urls_on_same_domain?(url1, url2)
puts "Determine if two URLs under the same domain: #{url1}, #{url2}" if @verbose
host1=url_2_host(url1)
host2=url_2_host(url2)
return get_domain_root(host1) == get_domain_root(host2)
rescue => ee
puts "Error searching the object content: #{ee}" if @verbose
  return nil
end