diff --git a/.dockerignore b/.dockerignore
index 1cf9cea..54a6860 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -242,3 +242,5 @@ fabric.properties
 # Custom rules
 .github
 docker
+snap
+*.snap
diff --git a/.github/workflows/snap-publish-release.yml b/.github/workflows/snap-publish-release.yml
new file mode 100644
index 0000000..ab5aa48
--- /dev/null
+++ b/.github/workflows/snap-publish-release.yml
@@ -0,0 +1,23 @@
+name: snap release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v2
+
+      - name: build snap
+        uses: snapcore/action-build@v1
+
+      - name: publish snap
+        uses: snapcore/action-publish@v1
+        with:
+          store_login: ${{ secrets.SNAP_LOGIN }}
+          snap: ${{ steps.build.outputs.snap }}
+          release: stable
diff --git a/.github/workflows/snap-publish-unstable.yml b/.github/workflows/snap-publish-unstable.yml
new file mode 100644
index 0000000..481b261
--- /dev/null
+++ b/.github/workflows/snap-publish-unstable.yml
@@ -0,0 +1,24 @@
+name: snap unstable
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v2
+
+      - name: build snap
+        uses: snapcore/action-build@v1
+
+      - name: publish snap
+        uses: snapcore/action-publish@v1
+        with:
+          store_login: ${{ secrets.SNAP_LOGIN }}
+          snap: ${{ steps.build.outputs.snap }}
+          release: edge
diff --git a/.gitignore b/.gitignore
index 67db37b..408fe2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -265,3 +265,4 @@ dmypy.json
 # Custom rules
 test_certbot
 *.ini
+*.snap
diff --git a/snap-constraints.txt b/snap-constraints.txt
new file mode 100644
index 0000000..ff441e7
--- /dev/null
+++ b/snap-constraints.txt
@@ -0,0 +1,198 @@
+# This file was generated by tools/pinning/current/repin.sh and can be updated using
+# that script.
+#
+# It is normally used as constraints to pip, however, it has the name
+# requirements.txt so that is scanned by GitHub. See
+# https://docs.github.com/en/github/visualizing-repository-data-with-graphs/about-the-dependency-graph#supported-package-ecosystems
+# for more info.
+alabaster==0.7.12; python_version >= "3.6"
+apacheconfig==0.3.2; python_version >= "3.6"
+appdirs==1.4.4; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
+appnope==0.1.2; python_version == "3.6" and sys_platform == "darwin" or python_version >= "3.7" and sys_platform == "darwin"
+astroid==2.6.6; python_version >= "3.6" and python_version < "4.0"
+atomicwrites==1.4.0; python_version >= "3.6" and python_full_version < "3.0.0" and sys_platform == "win32" or sys_platform == "win32" and python_version >= "3.6" and python_full_version >= "3.4.0"
+attrs==21.2.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+awscli==1.20.23; python_version >= "3.6"
+azure-devops==6.0.0b4; python_version >= "3.6"
+babel==2.9.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+backcall==0.2.0; python_version == "3.6" or python_version >= "3.7"
+bcrypt==3.2.0; python_version >= "3.6"
+beautifulsoup4==4.9.3; python_version >= "3.6" and python_version < "4.0" or python_version >= "3.6"
+bleach==4.0.0; python_version >= "3.6"
+boto3==1.18.23; python_version >= "3.6"
+botocore==1.21.23; python_version >= "3.6"
+cachecontrol==0.12.6; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
+cached-property==1.5.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+cachetools==4.2.2; python_version >= "3.5" and python_version < "4.0" and (python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6")
+cachy==0.3.0; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
+certifi==2021.5.30; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6"
+cffi==1.14.6; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0" or python_version >= "3.6"
+chardet==4.0.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+charset-normalizer==2.0.4; python_full_version >= "3.6.0" and python_version >= "3.6"
+cleo==1.0.0a4; python_version >= "3.6" and python_version < "4.0"
+cloudflare==2.8.15; python_version >= "3.6"
+colorama==0.4.3; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" and sys_platform == "win32" or python_full_version >= "3.5.0" and python_version >= "3.6" and sys_platform == "win32" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" and sys_platform == "win32" or python_version >= "3.6" and python_version < "4.0" and sys_platform == "win32" and python_full_version >= "3.5.0" or python_version >= "3.6" and python_full_version < "3.0.0" and platform_system == "Windows" or python_version >= "3.6" and python_full_version >= "3.5.0" and platform_system == "Windows" or python_version == "3.6" and python_full_version < "3.0.0" and sys_platform == "win32" or python_version == "3.6" and sys_platform == "win32" and python_full_version >= "3.5.0" or python_version >= "3.7" and python_full_version < "3.0.0" and sys_platform == "win32" or python_version >= "3.7" and sys_platform == "win32" and python_full_version >= "3.5.0"
+configargparse==1.5.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+configobj==5.0.6; python_version >= "3.6"
+coverage==5.5; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version < "4" and python_version >= "3.6"
+crashtest==0.3.1; python_version >= "3.6" and python_version < "4.0"
+cryptography==3.4.7; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_version >= "3.6" or python_version >= "3.6" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and sys_platform == "linux"
+cython==0.29.24; (python_version >= "2.6" and python_full_version < "3.0.0") or (python_full_version >= "3.3.0")
+dataclasses==0.8; python_version >= "3.6" and python_version < "3.7"
+decorator==5.0.9; python_version == "3.6" or python_version > "3.6" or python_version >= "3.5" or python_version >= "3.7"
+deprecated==1.2.12; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+distlib==0.3.2; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_version >= "3.6"
+distro==1.6.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_version >= "3.6"
+dns-lexicon==3.7.0; python_version >= "3.6" and python_version < "4.0"
+dnspython==2.1.0; python_version >= "3.6"
+docker-compose==1.26.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+docker==4.2.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+dockerpty==0.4.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+docopt==0.6.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+docutils==0.15.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6"
+entrypoints==0.3; python_version >= "3.6" and python_version < "4.0"
+execnet==1.9.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+fabric==2.6.0; python_version >= "3.6"
+filelock==3.0.12; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.5.0" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_version < "4.0"
+google-api-core==1.31.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+google-api-python-client==2.17.0; python_version >= "3.6"
+google-auth-httplib2==0.1.0; python_version >= "3.6"
+google-auth==1.35.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+googleapis-common-protos==1.53.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+html5lib==1.1; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.5.0"
+httplib2==0.19.1; python_version >= "3.6"
+idna==3.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6" and python_version < "4.0"
+imagesize==1.2.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+importlib-metadata==1.7.0; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "3.8" or python_version >= "3.6" and python_version < "3.8" and python_full_version >= "3.5.0"
+importlib-resources==5.2.2; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "3.7" or python_version >= "3.6" and python_version < "3.7" and python_full_version >= "3.4.0"
+iniconfig==1.1.1; python_version >= "3.6"
+invoke==1.6.0; python_version >= "3.6"
+ipdb==0.13.9; python_version >= "3.6"
+ipython-genutils==0.2.0
+ipython==7.16.1; python_version == "3.6"
+ipython==7.26.0; python_version >= "3.7"
+isodate==0.6.0; python_version >= "3.6"
+isort==5.8.0; python_version >= "3.6" and python_version < "4.0"
+jedi==0.18.0; python_version == "3.6" or python_version >= "3.7"
+jeepney==0.7.1; python_version >= "3.6" and python_version < "4.0" and sys_platform == "linux"
+jinja2==3.0.1; python_version >= "3.6" or python_version >= "3.6"
+jmespath==0.10.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6"
+josepy==1.8.0; python_version >= "3.6"
+jsonlines==2.0.0; python_version >= "3.6"
+jsonpickle==2.0.0; python_version >= "3.6"
+jsonschema==3.2.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+keyring==22.3.0; python_version >= "3.6" and python_version < "4.0" or python_version >= "3.6"
+lazy-object-proxy==1.6.0; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.6.0"
+lockfile==0.12.2
+markupsafe==2.0.1; python_version >= "3.6"
+matplotlib-inline==0.1.2; python_version >= "3.7"
+mccabe==0.6.1; python_version >= "3.6" and python_version < "4.0"
+mock==4.0.3; python_version >= "3.6"
+msgpack==1.0.2; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
+msrest==0.6.21; python_version >= "3.6"
+mypy-extensions==0.4.3; python_version >= "3.6"
+mypy==0.910; python_version >= "3.6"
+oauth2client==4.1.3; python_version >= "3.6"
+oauthlib==3.1.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+packaging==20.9; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version >= "3.5.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+paramiko==2.7.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_version >= "3.6"
+parsedatetime==2.6; python_version >= "3.6"
+parso==0.8.2; python_version == "3.6"
+pathlib2==2.3.6; python_version >= "3.6"
+pexpect==4.8.0; python_version >= "3.6" and python_version < "4.0" or python_version == "3.6" and sys_platform != "win32" or python_version >= "3.7" and sys_platform != "win32"
+pickleshare==0.7.5; python_version == "3.6" or python_version >= "3.7"
+pip==21.2.4; python_version >= "3.6"
+pkginfo==1.7.1; python_version >= "3.6" and python_version < "4.0" or python_version >= "3.6"
+pluggy==0.13.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version >= "3.5.0"
+ply==3.11; python_version >= "3.6"
+poetry-core==1.1.0a6; python_version >= "3.6" and python_version < "4.0"
+poetry==1.2.0a2; python_version >= "3.6" and python_version < "4.0"
+prompt-toolkit==3.0.3; python_version == "3.6" or python_version >= "3.7"
+protobuf==3.17.3; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+ptyprocess==0.7.0; python_version >= "3.6" and python_version < "4.0"
+py==1.10.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version >= "3.5.0"
+pyasn1-modules==0.2.8; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6"
+pyasn1==0.4.8; python_version >= "3.6" and python_version < "4" or python_version >= "3.6"
+pycparser==2.20; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+pygithub==1.55; python_version >= "3.6"
+pygments==2.10.0; python_version >= "3.6" or python_version == "3.6" or python_version >= "3.7"
+pyjwt==2.1.0; python_version >= "3.6"
+pylev==1.4.0; python_version >= "3.6" and python_version < "4.0"
+pylint==2.9.6; python_version >= "3.6" and python_version < "4.0"
+pynacl==1.4.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+pynsist==2.7; python_version >= "3.6"
+pyopenssl==20.0.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+pyparsing==2.4.7; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0"
+pypiwin32==223; sys_platform == "win32" and python_version >= "3.6" and (python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6")
+pyrfc3339==1.1; python_version >= "3.6"
+pyrsistent==0.18.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+pytest-cov==2.12.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+pytest-forked==1.3.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+pytest-xdist==2.3.0; python_version >= "3.6" or python_version >= "3.6"
+pytest==6.2.4; python_version >= "3.6" or python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+python-augeas==1.1.0; python_version >= "3.6"
+python-dateutil==2.8.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6"
+python-digitalocean==1.16.0; python_version >= "3.6"
+python-dotenv==0.19.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+pytz==2021.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0" or python_version >= "3.6" or python_full_version >= "3.6.0" and python_version >= "3.6"
+pywin32-ctypes==0.2.0; python_version >= "3.6" and python_version < "4.0" and sys_platform == "win32"
+pywin32==301; sys_platform == "win32" and python_version >= "3.6" or sys_platform == "win32" and python_version >= "3.6" and (python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6")
+pyyaml==5.4.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.6.0"
+readme-renderer==29.0; python_version >= "3.6"
+requests-download==0.1.2; python_version >= "3.6"
+requests-file==1.5.1; python_version >= "3.6" and python_version < "4.0"
+requests-oauthlib==1.3.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+requests-toolbelt==0.9.1; python_version >= "3.6" and python_version < "4.0" or python_version >= "3.6" or python_version >= "3.6"
+requests==2.26.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.6.0"
+rfc3986==1.5.0; python_version >= "3.6"
+rsa==4.7.2; python_version >= "3.6" and python_version < "4" or python_version >= "3.5" and python_version < "4" and (python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6")
+s3transfer==0.5.0; python_version >= "3.6"
+secretstorage==3.3.1; python_version >= "3.6" and python_version < "4.0" and sys_platform == "linux"
+setuptools==57.4.0; python_version >= "3.6" or python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version == "3.6" or python_version >= "3.7" or python_version >= "3.6" and python_version < "4.0"
+shellingham==1.4.0; python_version >= "3.6" and python_version < "4.0"
+six==1.16.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" or python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_full_version >= "3.3.0" and python_version >= "3.6" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.5.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_full_version >= "3.6.0" and python_version >= "3.6" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.3.0" or python_version == "3.6" and python_full_version < "3.0.0" or python_version == "3.6" and python_full_version >= "3.3.0"
+snowballstemmer==2.1.0; python_version >= "3.6"
+soupsieve==2.2.1; python_version >= "3.6"
+sphinx-rtd-theme==0.5.2; python_version >= "3.6"
+sphinx==4.1.2; python_version >= "3.6"
+sphinxcontrib-applehelp==1.0.2; python_version >= "3.6"
+sphinxcontrib-devhelp==1.0.2; python_version >= "3.6"
+sphinxcontrib-htmlhelp==2.0.0; python_version >= "3.6"
+sphinxcontrib-jsmath==1.0.1; python_version >= "3.6"
+sphinxcontrib-qthelp==1.0.3; python_version >= "3.6"
+sphinxcontrib-serializinghtml==1.1.5; python_version >= "3.6"
+texttable==1.6.4; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+tldextract==3.1.0; python_version >= "3.6" and python_version < "4.0"
+toml==0.10.2; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6" or python_full_version >= "3.5.0" and python_version >= "3.6" or python_version == "3.6" and python_full_version < "3.0.0" or python_version > "3.6" and python_full_version < "3.0.0" or python_version == "3.6" and python_full_version >= "3.3.0" or python_version > "3.6" and python_full_version >= "3.3.0" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.3.0"
+tomlkit==0.7.2; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.5.0"
+tox==3.24.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.5.0"
+tqdm==4.62.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0"
+traitlets==4.3.3
+twine==3.3.0; python_version >= "3.6"
+typed-ast==1.4.3; python_version >= "3.6" and python_version < "3.8" or implementation_name == "cpython" and python_version < "3.8" and python_version >= "3.6"
+types-cryptography==3.3.5; python_version >= "3.6"
+types-enum34==0.1.8; python_version >= "3.6"
+types-ipaddress==0.1.5; python_version >= "3.6"
+types-mock==0.1.5; python_version >= "3.6"
+types-pyopenssl==20.0.5; python_version >= "3.6"
+types-pyrfc3339==0.1.2; python_version >= "3.6"
+types-python-dateutil==0.1.6; python_version >= "3.6"
+types-pytz==2021.1.2; python_version >= "3.6"
+types-requests==2.25.6; python_version >= "3.6"
+types-setuptools==57.0.2; python_version >= "3.6"
+types-six==1.16.0; python_version >= "3.6"
+typing-extensions==3.10.0.0; python_version >= "3.6" or python_version >= "3.6" and python_version < "3.8"
+uritemplate==3.0.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
+urllib3==1.26.6; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version < "4" and python_version >= "3.6" or python_full_version >= "3.5.0" and python_version < "4" and python_version >= "3.6"
+virtualenv==20.4.4; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.5.0"
+wcwidth==0.2.5; python_version == "3.6"
+webencodings==0.5.1; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "4.0" or python_version >= "3.6" and python_version < "4.0" and python_full_version >= "3.5.0" or python_version >= "3.6"
+websocket-client==0.59.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6" or python_full_version >= "3.5.0" and python_version >= "3.6"
+wheel==0.37.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.5.0"
+wrapt==1.12.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_version >= "3.6" and python_full_version >= "3.4.0" or python_version >= "3.6" and python_version < "4.0"
+yarg==0.1.9; python_version >= "3.6"
+zipp==3.5.0; python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "3.8" or python_version >= "3.6" and python_version < "3.8" and python_full_version >= "3.5.0" or python_version >= "3.6" and python_full_version < "3.0.0" and python_version < "3.7" or python_version >= "3.6" and python_version < "3.7" and python_full_version >= "3.4.0"
+zope.component==5.0.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+zope.event==4.5.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+zope.hookable==5.1.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
+zope.interface==5.4.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"
diff --git a/snap-requirements.txt b/snap-requirements.txt
new file mode 100644
index 0000000..8e2f231
--- /dev/null
+++ b/snap-requirements.txt
@@ -0,0 +1,2 @@
+requests>=2.20.0
+zope.interface>=5.0.0
diff --git a/snap/hooks/post-refresh b/snap/hooks/post-refresh
new file mode 100644
index 0000000..717714c
--- /dev/null
+++ b/snap/hooks/post-refresh
@@ -0,0 +1,21 @@
+#!/bin/sh -e
+# This file is generated automatically and should not be edited manually.
+
+# get certbot version
+if [ ! -f "$SNAP/certbot-shared/certbot-version.txt" ]; then
+  echo "No certbot version available; not doing version comparison check" >> "$SNAP_DATA/debuglog"
+  exit 0
+fi
+cb_installed=$(cat $SNAP/certbot-shared/certbot-version.txt)
+
+# get required certbot version for plugin. certbot version must be at least the plugin's
+# version. note that this is not the required version in setup.py, but the version number itself.
+cb_required=$(grep -oP "version = '\K.*(?=')" $SNAP/setup.py)
+
+
+$SNAP/bin/python3 -c "import sys; from packaging import version; sys.exit(1) if  version.parse('$cb_installed') < version.parse('$cb_required') else sys.exit(0)" || exit_code=$?
+if [ "$exit_code" -eq 1 ]; then
+  echo "Certbot is version $cb_installed but needs to be at least $cb_required before" \
+    "this plugin can be updated; will try again on next refresh."
+  exit 1
+fi
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
new file mode 100644
index 0000000..3e1a0b0
--- /dev/null
+++ b/snap/snapcraft.yaml
@@ -0,0 +1,48 @@
+name: certbot-dns-duckdns
+summary: DuckDNS Authenticator plugin for Certbot
+description: DuckDNS Authenticator plugin for Certbot
+confinement: strict
+grade: stable
+base: core20
+adopt-info: certbot-dns-duckdns
+
+parts:
+  certbot-dns-duckdns:
+    plugin: python
+    source: .
+    override-pull: |
+      snapcraftctl pull
+      snapcraftctl set-version `grep ^__version__ $SNAPCRAFT_PART_SRC/certbot_dns_duckdns/__init__.py | cut -f2 -d= | tr -d "\"[:space:]\""`
+    build-environment:
+      - PIP_CONSTRAINT: $SNAPCRAFT_PART_SRC/snap-constraints.txt
+      - SNAP_BUILD: "True"
+    requirements:
+      - snap-requirements.txt
+    build-packages:
+      - gcc
+      - git
+      - build-essential
+      - libssl-dev
+      - libffi-dev
+      - python3-dev
+      - cargo
+  certbot-metadata:
+    plugin: dump
+    source: .
+    stage: [ setup.py, certbot-shared ]
+    override-pull: |
+      snapcraftctl pull
+      mkdir -p $SNAPCRAFT_PART_SRC/certbot-shared
+
+slots:
+  certbot:
+    interface: content
+    content: certbot-1
+    read:
+      - $SNAP/lib/python3.8/site-packages
+
+plugs:
+  certbot-metadata:
+    interface: content
+    content: metadata-1
+    target: $SNAP/certbot-shared