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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
import calendar
import re
import requests
import time
from discover.configuration import Configuration
from discover.fetcher import Fetcher
from utils.string_utils import jsonify
class ApiAccess(Fetcher):
subject_token = None
initialized = False
regions = {}
config = None
api_config = None
host = ""
base_url = ""
admin_token = ""
tokens = {}
admin_endpoint = ""
admin_project = None
auth_response = None
alternative_services = {
"neutron": ["quantum"]
}
# identitity API v2 version with admin token
def __init__(self):
super(ApiAccess, self).__init__()
if ApiAccess.initialized:
return
ApiAccess.config = Configuration()
ApiAccess.api_config = ApiAccess.config.get("OpenStack")
host = ApiAccess.api_config["host"]
ApiAccess.host = host
port = ApiAccess.api_config["port"]
if not (host and port):
raise ValueError('Missing definition of host or port ' +
'for OpenStack API access')
ApiAccess.base_url = "http://" + host + ":" + port
ApiAccess.admin_token = ApiAccess.api_config["admin_token"]
ApiAccess.admin_project = ApiAccess.api_config["admin_project"] \
if "admin_project" in ApiAccess.api_config \
else 'admin'
ApiAccess.admin_endpoint = "http://" + host + ":" + "35357"
token = self.v2_auth_pwd(ApiAccess.admin_project)
if not token:
raise ValueError("Authentication failed. Failed to obtain token")
else:
self.subject_token = token
@staticmethod
def parse_time(time_str):
try:
time_struct = time.strptime(time_str, "%Y-%m-%dT%H:%M:%SZ")
except ValueError:
try:
time_struct = time.strptime(time_str,
"%Y-%m-%dT%H:%M:%S.%fZ")
except ValueError:
return None
return time_struct
# try to use existing token, if it did not expire
def get_existing_token(self, project_id):
try:
token_details = ApiAccess.tokens[project_id]
except KeyError:
return None
token_expiry = token_details["expires"]
token_expiry_time_struct = self.parse_time(token_expiry)
if not token_expiry_time_struct:
return None
token_expiry_time = token_details["token_expiry_time"]
now = time.time()
if now > token_expiry_time:
# token has expired
ApiAccess.tokens.pop(project_id)
return None
return token_details
def v2_auth(self, project_id, headers, post_body):
subject_token = self.get_existing_token(project_id)
if subject_token:
return subject_token
req_url = ApiAccess.base_url + "/v2.0/tokens"
response = requests.post(req_url, json=post_body, headers=headers)
ApiAccess.auth_response = response.json()
if 'error' in self.auth_response:
e = self.auth_response['error']
self.log.error(str(e['code']) + ' ' + e['title'] + ': ' +
e['message'] + ", URL: " + req_url)
return None
try:
token_details = ApiAccess.auth_response["access"]["token"]
except KeyError:
# assume authentication failed
return None
token_expiry = token_details["expires"]
token_expiry_time_struct = self.parse_time(token_expiry)
if not token_expiry_time_struct:
return None
token_expiry_time = calendar.timegm(token_expiry_time_struct)
token_details["token_expiry_time"] = token_expiry_time
ApiAccess.tokens[project_id] = token_details
return token_details
def v2_auth_pwd(self, project):
user = ApiAccess.api_config["user"]
pwd = ApiAccess.api_config["pwd"]
post_body = {
"auth": {
"passwordCredentials": {
"username": user,
"password": pwd
}
}
}
if project is not None:
post_body["auth"]["tenantName"] = project
project_id = project
else:
project_id = ""
headers = {
'Accept': 'application/json',
'Content-Type': 'application/json; charset=UTF-8'
}
return self.v2_auth(project_id, headers, post_body)
def get_rel_url(self, relative_url, headers):
req_url = ApiAccess.base_url + relative_url
return self.get_url(req_url, headers)
def get_url(self, req_url, headers):
response = requests.get(req_url, headers=headers)
if response.status_code != requests.codes.ok:
# some error happened
if "reason" in response:
msg = ", reason: {}".format(response.reason)
else:
msg = ", response: {}".format(response.text)
self.log.error("req_url: {} {}".format(req_url, msg))
return response
ret = response.json()
return ret
def get_region_url(self, region_name, service):
if region_name not in self.regions:
return None
region = self.regions[region_name]
s = self.get_service_region_endpoints(region, service)
if not s:
return None
orig_url = s["adminURL"]
# replace host name with the host found in config
url = re.sub(r"^([^/]+)//[^:]+", r"\1//" + ApiAccess.host, orig_url)
return url
# like get_region_url(), but remove everything starting from the "/v2"
def get_region_url_nover(self, region, service):
full_url = self.get_region_url(region, service)
if not full_url:
self.log.error("could not find region URL for region: " + region)
exit()
url = re.sub(r":([0-9]+)/v[2-9].*", r":\1", full_url)
return url
def get_catalog(self, pretty):
return jsonify(self.regions, pretty)
# find the endpoints for a given service name,
# considering also alternative service names
def get_service_region_endpoints(self, region, service):
alternatives = [service]
endpoints = region["endpoints"]
if service in self.alternative_services:
alternatives.extend(self.alternative_services[service])
for sname in alternatives:
if sname in endpoints:
return endpoints[sname]
return None
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