Add python client for SMS service

Add python client for SMS service.
Other ONAP microservices can use this
client to connect to SMS to store and get
secrets.

Issue-ID: AAF-438
Change-Id: I5bb39001e8482b9191512b1422ed7edadbd2ec67
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

2 files changed, 249 insertions, 0 deletions

diff --git a/sms-client/.gitignore b/sms-client/.gitignore
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index 0000000..7e99e36
--- /dev/null
+++ b/sms-client/.gitignore
@@ -0,0 +1 @@
+*.pyc
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diff --git a/sms-client/python/sms/__init__.py b/sms-client/python/sms/__init__.py
new file mode 100644
index 0000000..88a7621
--- /dev/null
+++ b/sms-client/python/sms/__init__.py
@@ -0,0 +1,248 @@
+# Copyright 2018 Intel Corporation, Inc
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+import requests
+import requests.exceptions
+import urlparse
+
+class InvalidRequestException(Exception):
+    pass
+
+class InternalServerError(Exception):
+    pass
+
+class UnexpectedError(Exception):
+    pass
+
+class Client(object):
+    """Python Client for Secret Management Service"""
+
+    def __init__(self, url='http://localhost:10443', timeout=30, cacert=None):
+        """Creates a new SMS client instance
+
+        Args:
+            url (str): Base URL with port pointing to the SMS service
+            timeout (int): Number of seconds before aborting the connection
+            cacert (str): Path to the cacert that will be used to verify
+                If this is None, verify will be False and the server cert
+                is not verified by the client.
+        Returns:
+            A Client object which can be used to interact with SMS service
+        """
+
+        self.base_url = url
+        self.timeout = timeout
+        self.cacert = cacert
+        self.session = requests.Session()
+
+        self._base_api_url = '/v1/sms'
+
+    def _urlJoin(self, *urls):
+        """Joins given urls into a single url
+
+        Args:
+            urls (str): url fragments to be combined.
+
+        Returns:
+            str: Joined URL
+        """
+
+        return '/'.join(urls)
+
+    def _raiseException(self, statuscode, errors=None):
+        """ Handles Exception Raising based on statusCode
+
+        Args:
+            statuscode (int): status code returned by the server
+            errors (str): list of strings containing error messages
+
+        Returns:
+            exception: An exception is raised based on error message
+        """
+
+        if statuscode == 400:
+            raise InvalidRequestException(errors)
+        if statuscode == 500:
+            raise InternalServerError(errors)
+
+        raise UnexpectedError(errors)
+
+    def _request(self, method, url, headers=None, **kwargs):
+        """Handles request for all the client methods
+
+        Args:
+            method (str): type of HTTP method (get, post or delete).
+            url (str): api URL.
+            headers (dict): custom headers if any.
+            **kwargs: various args supported by requests library
+
+        Returns:
+            requests.Response: An object containing status_code and returned
+                               json data is returned here.
+        """
+
+        if headers is None:
+            headers = {
+                'content-type': "application/json",
+                'Accept': "application/json"
+            }
+
+        #Verify the server or not based on the cacert argument
+        if self.cacert is None:
+            verify = False
+        else:
+            verify = self.cacert
+
+        url = urlparse.urljoin(self.base_url, url)
+        response = self.session.request(method, url, headers=headers,
+                                        allow_redirects=False, verify=verify,
+                                        timeout = self.timeout, **kwargs)
+
+        errors = None
+        if response.status_code >= 400 and response.status_code < 600:
+            #Request Failed. Raise Exception.
+            errors = response.text
+            self._raiseException(response.status_code, errors)
+
+        return response
+
+    def getStatus(self):
+        """Returns Status of SMS Service
+
+        Returns:
+            bool: True or False depending on if SMS Service is ready.
+        """
+
+        url = self._urlJoin(self._base_api_url, 'quorum', 'status')
+
+        response = self._request('get', url)
+        return response.json()['sealstatus']
+
+    def createDomain(self, domainName):
+        """Creates a Secret Domain
+
+        Args:
+            domainName (str): Name of the secret domain to create
+
+        Returns:
+            string: UUID of the created domain name
+        """
+
+
+        domainName = domainName.strip()
+        data = {"name": domainName}
+        url = self._urlJoin(self._base_api_url, 'domain')
+
+        response = self._request('post', url, json = data)
+        return response.json()['uuid']
+
+    def deleteDomain(self, domainName):
+        """Deletes a Secret Domain
+
+        Args:
+            domainName (str): Name of the secret domain to delete
+
+        Returns:
+            bool: True. An exception will be raised if delete failed.
+        """
+
+        domainName = domainName.strip()
+        url = self._urlJoin(self._base_api_url, 'domain', domainName)
+
+        self._request('delete', url)
+        return True
+
+    def getSecretNames(self, domainName):
+        """Get all Secret Names in Domain
+
+        Args:
+            domainName (str): Name of the secret domain
+
+        Returns:
+            string[]: List of strings each corresponding to a
+                      Secret's Name in this Domain.
+        """
+
+        domainName = domainName.strip()
+        url = self._urlJoin(self._base_api_url, 'domain', domainName,
+                            'secret')
+
+        response = self._request('get', url)
+        return response.json()['secretnames']
+
+
+    def storeSecret(self, domainName, secretName, values):
+        """Store a Secret in given Domain
+
+        Args:
+            domainName (str): Name of the secret domain
+            secretName (str): Name for the Secret
+            values (dict): A dict containing name-value pairs which
+                           form the secret
+
+        Returns:
+            bool: True. An exception will be raised if store failed.
+        """
+
+        domainName = domainName.strip()
+        secretName = secretName.strip()
+        url = self._urlJoin(self._base_api_url, 'domain', domainName,
+                            'secret')
+
+        if not isinstance(values, dict):
+            raise TypeError('Input values is not a dictionary')
+
+        data = {"name": secretName, "values": values}
+        self._request('post', url, json = data)
+        return True
+
+    def getSecret(self, domainName, secretName):
+        """Get a particular Secret from Domain.
+
+        Args:
+            domainName (str): Name of the secret domain
+            secretName (str): Name of the secret
+
+        Returns:
+            dict: dictionary containing the name-value pairs
+                  which form the secret
+        """
+
+        domainName = domainName.strip()
+        secretName = secretName.strip()
+        url = self._urlJoin(self._base_api_url, 'domain', domainName,
+                            'secret', secretName)
+
+        response = self._request('get', url)
+        return response.json()['values']
+
+    def deleteSecret(self, domainName, secretName):
+        """Delete a particular Secret from Domain.
+
+        Args:
+            domainName (str): Name of the secret domain
+            secretName (str): Name of the secret
+
+        Returns:
+            bool: True. An exception will be raised if delete failed.
+        """
+
+        domainName = domainName.strip()
+        secretName = secretName.strip()
+        url = self._urlJoin(self._base_api_url, 'domain', domainName,
+                            'secret', secretName)
+
+        self._request('delete', url)
+        return True
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