initial working version

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### Python template
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# dotenv
+.env
+
+# virtualenv
+.venv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+
+# Rope project settings
+.ropeproject
+
+.idea

Dockerfile

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+FROM frolvlad/alpine-python3
+
+RUN pip3 install gunicorn EPP flask flask-restful
+EXPOSE 8000:8000

README.md

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+# WHOIS service
+
+WHOIS service is a REST API microservice which checks whether an sk domain if free or already taken.
+This service uses EPP interface of SK-NIC.
+
+## Setup
+
+Clone this repository and then create an `.env` file next to `docker-compose.yml` file.
+The `.env` should contain EPP settings:
+```
+EPP_NAME=<EPP_NAME>
+EPP_PASSWORD=<EPP_PASSWORD>
+```
+
+Afterwards, you can run this command:
+
+``docker-compose run``
+
+Service is available at `127.0.0.1:8000`. For example, you can try to send GET request like this: `curl 127.0.0.1:8000/domain/domainname.sk` .
+
+The HTTP response code is `200` if `domainname.sk` is already registered. Response payload is in the following form:
+
+```
+{
+    "domain": "domainname.sk",
+    "exp_date": "2018-06-24T23:59:59.0Z"
+}
+```
+
+The HTTP response code is `404` if `domainname.sk` is free and it's possible to register. Response payload is in the following form:
+```
+{
+    "domain": "domainname.sk"
+}
+```

docker-compose.yml

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+version: '2'
+
+services:
+  whois:
+    build: .
+    working_dir: /srv/whois
+    volumes:
+      - .:/srv/whois
+    command: gunicorn --config=gunicorn.conf service:app
+    ports:
+      - 127.0.0.1:8000:8000
+    environment:
+      - EPP_NAME=${EPP_NAME}
+      - EPP_PASSWORD=${EPP_PASSWORD}

gunicorn.conf

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+bind = '0.0.0.0:8000'
+workers = 2

service.py

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+import os
+
+from eppy.client import EppClient
+from eppy.doc import *
+from flask import Flask
+from flask_restful import Resource, Api
+
+
+extra_ext_uris = [
+        'http://www.sk-nic.sk/xml/epp/sk-contact-ident-0.2',
+        'urn:ietf:params:xml:ns:rgp-1.0',
+        'urn:ietf:params:xml:ns:auxcontact-0.1'
+]
+
+
+extra_nsmap = {
+    'skContactIdent': 'http://www.sk-nic.sk/xml/epp/sk-contact-ident-0.2',
+    'rgp': 'urn:ietf:params:xml:ns:rgp-1.0',
+    'auxcontact': 'urn:ietf:params:xml:ns:auxcontact-0.1'
+}
+
+
+app = Flask(__name__)
+api = Api(app)
+
+
+class Domain(Resource):
+    def get(self, domain_name):
+        client = EppClient(ssl_validate_cert=False, ssl_validate_hostname=False)
+        client.connect('epp.sk-nic.sk')
+
+        # client.login('KAFE-0001', '@a3dwK8eyf!B7>0q', extra_ext_uris=extra_ext_uris)
+        client.login(os.environ.get('EPP_NAME'), os.environ.get('EPP_PASSWORD'), extra_ext_uris=extra_ext_uris)
+
+        cmd = EppInfoDomainCommand(extra_nsmap=extra_nsmap)
+
+        cmd.name = domain_name
+        resp = client.send(cmd, extra_nsmap=extra_nsmap)
+        if resp.ok:
+            return {'domain': domain_name, 'exp_date': resp.resData['domain:infData']['exDate']}
+        else:
+            return {'domain': domain_name}, 404
+
+
+api.add_resource(Domain, '/domain/<string:domain_name>')