url.py
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	#!/usr/bin/env python3

	# -------------------------------------------------------------
	# Operations utilities
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Author: Sébastien Santoro aka Dereckson
	# Created: 2018-09-22
	# License: BSD-2-Clause
	# Source file: roles/devserver/userland-software/files/url.py
	# -------------------------------------------------------------
	#
	# <auto-generated>
	# This file is managed by our rOPS SaltStack repository.
	#
	# Changes to this file may cause incorrect behavior
	# and will be lost if the state is redeployed.
	# </auto-generated>


	import platform
	import os
	import sys
	import yaml


	# -------------------------------------------------------------
	# Exceptions
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	class NotFoundException(Exception):
	pass


	# -------------------------------------------------------------
	# Configuration file locator
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_candidates_configuration_files():
	candidates = []

	if "HOME" in os.environ:
	candidates.append(os.environ["HOME"] + "/.urls.yml")

	candidates.append("/usr/local/etc/urls.yml")
	candidates.append("/etc/urls.yml")

	return candidates


	def find_configuration_file():
	for candidate in get_candidates_configuration_files():
	if os.path.isfile(candidate):
	return candidate


	# -------------------------------------------------------------
	# Configuration file parser
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def parse_configuration_file(filename):
	configuration_file = open(filename, "r")
	configuration = yaml.safe_load(configuration_file)
	configuration_file.close()

	if "urls" not in configuration:
	configuration["urls"] = {}

	return configuration


	def get_configuration():
	configuration_file = find_configuration_file()

	if configuration_file is None:
	print_error("No shell configuration file found")
	exit(2)

	return parse_configuration_file(configuration_file)


	# -------------------------------------------------------------
	# URL resolver
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def extract_relative_url(base_directory, search_path):
	n = len(base_directory) + 1
	return search_path[n:]


	def extract_relative_user_url(base_directory, search_path):
	return extract_relative_url_in_fragments(base_directory, search_path, 1)


	def extract_relative_wwwroot_url(base_directory, search_path):
	return extract_relative_url_in_fragments(base_directory, search_path, 2)


	def extract_relative_url_in_fragments(base_directory, search_path, fragments_count):
	base_url = extract_relative_url(base_directory, search_path)
	fragments = base_url.split("/", fragments_count)

	expected_len = fragments_count + 1
	actual_len = len(fragments)
	delta_len = expected_len - actual_len

	if delta_len > 1 or len(fragments[0]) == 0:
	raise NotFoundException()

	if delta_len == 1:
	fragments.append("")

	return tuple(fragments)


	def resolve_url(base_directory, args, search_path):
	if "static" in args:
	return args["static"] + extract_relative_url(base_directory, search_path)

	if "userdir" in args:
	username, local_url = extract_relative_user_url(base_directory, search_path)
	return "https://" + platform.node() + "/~" + username + "/" + local_url

	if "wwwroot" in args:
	domain, sub, local_url = extract_relative_wwwroot_url(
	base_directory, search_path
	)
	return "https://" + sub + "." + domain + "/" + local_url

	return None


	def find_path(base_directory, search_path):
	if os.path.isabs(search_path):
	normalized_path = search_path
	else:
	normalized_path = os.path.normpath(os.path.join(base_directory, search_path))

	return os.path.realpath(normalized_path)


	def find_url(urls, base_directory, required_path):
	path = find_path(base_directory, required_path)

	for url_base_dir, url_args in urls.items():
	url_base_dir = os.path.realpath(url_base_dir)
	if path.startswith(url_base_dir):
	try:
	return resolve_url(url_base_dir, url_args, path)
	except NotFoundException:
	continue

	return None


	# -------------------------------------------------------------
	# Runner code
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_program_name():
	return os.path.basename(sys.argv[0])


	def print_error(err):
	print("{}: {}".format(get_program_name(), err), file=sys.stderr)


	def usage():
	print("usage: url [path]", file=sys.stderr)


	def parse_path_argument():
	argc = len(sys.argv)

	if argc == 1:
	return "."
	elif argc == 2:
	return sys.argv[1]
	else:
	usage()
	exit(1)


	def main():
	required_path = parse_path_argument()
	config = get_configuration()

	url = find_url(config["urls"], os.getcwd(), required_path)
	if url is None:
	print_error("No URL found.")
	sys.exit(1)
	else:
	print(url)


	if __name__ == "__main__":
	main()

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