initial version 🎉

.gitignore

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+# APNS keys
+push.crt
+push.key
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# 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/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

apns.py

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+from __future__ import annotations
+
+class Fields:
+    @staticmethod
+    def from_bytes(data: bytes) -> Fields:
+        fields = {}
+
+        while len(data) > 0:
+            field = data[0]
+            length = int.from_bytes(data[1:3], "big")
+            value = data[3:3 + length]
+
+            fields[field] = value
+
+            data = data[3 + length:]
+
+        return Fields(fields)
+
+    def __init__(self, fields: dict[int, bytes]):
+        self.fields = fields
+
+    def to_bytes(self) -> bytes:
+        buffer = bytearray()
+
+        for field, value in self.fields.items():
+            buffer.append(field)
+            buffer.extend(len(value).to_bytes(2, "big"))
+            buffer.extend(value)
+
+        return buffer
+
+    # Debug formating
+    def __str__(self) -> str:
+        return f"{self.fields}"
+
+# Define number to command name mapping
+COMMANDS = {
+    0x7: "Connect",
+    0x8: "ConnectResponse",
+    0x9: "PushTopics",
+    0x0A: "PushNotification",
+}
+
+class Payload:
+    @staticmethod
+    def from_stream(stream) -> Payload|None:
+        command = int.from_bytes(stream.read(1), "big")
+        if command == 0:
+            return None # We reached the end of the stream
+        length = int.from_bytes(stream.read(4), "big")
+        fields = Fields.from_bytes(stream.read(length))
+
+        return Payload(command, fields)
+    
+    @staticmethod
+    def from_bytes(data: bytes) -> Payload:
+        # Convert it to bytes for cleaner printing
+        data = bytes(data)
+        command = data[0]
+        length = int.from_bytes(data[1:5], "big")
+        fields = Fields.from_bytes(data[5:5 + length])
+
+        return Payload(command, fields)
+    
+    def __init__(self, command: int, fields: Fields):
+        self.command = command
+        self.fields = fields
+
+    def to_bytes(self) -> bytes:
+        buffer = bytearray()
+
+        buffer.append(self.command)
+
+        fields = self.fields.to_bytes()
+
+        buffer.extend(len(fields).to_bytes(4, "big"))
+        buffer.extend(fields)
+
+        return buffer
+
+    # Debug formating
+    def __str__(self) -> str:
+        return f"{COMMANDS[self.command]}: {self.fields}"
+    
+if __name__ == "__main__":
+    import courier
+    sock = courier.connect()
+    payload = Payload(7, Fields({2: 0x01.to_bytes()}))
+    sock.write(payload.to_bytes())
+    print("recieved: ", Payload.from_stream(sock))
+    print("recieved: ", Payload.from_stream(sock))
+    sock.close()
+# with socket.create_connection((COURIER_HOST, COURIER_PORT)) as sock:
+#     with context.wrap_socket(sock, server_hostname=COURIER_HOST) as ssock:
+#         payload = Payload(7, Fields({2: 0x01.to_bytes()}))
+#         #print(payload)
+#         #print(payload.to_bytes())
+#         #print(Payload.from_bytes(payload.to_bytes()))
+#         ssock.write(payload.to_bytes())
+#         print("recieved: ", Payload.from_stream(ssock))
+#         print("recieved: ", Payload.from_stream(ssock))

courier.py

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+import albert
+import tlslite
+import socket
+
+COURIER_HOST = "10-courier.push.apple.com"
+COURIER_PORT = 5223
+#ALPN = [b"apns-security-v2"]
+ALPN = None
+
+# Check if we have already generated a push certificate
+# If not, generate one
+def _setup_push_cert():
+    try:
+        with open("push.key", "r") as f:
+            private_key = f.read()
+        with open("push.crt", "r") as f:
+            cert = f.read()
+    except FileNotFoundError:
+        private_key, cert = albert.generate_push_cert()
+        with open("push.key", "w") as f:
+            f.write(private_key)
+        with open("push.crt", "w") as f:
+            f.write(cert)
+    
+    return private_key, cert
+
+def connect():
+    private_key, cert = _setup_push_cert()
+
+    # Connect to the courier server
+    sock = socket.create_connection((COURIER_HOST, COURIER_PORT))
+    # Wrap the socket in TLS
+    sock = tlslite.TLSConnection(sock)
+    # Parse the certificate and private key
+    cert = tlslite.X509CertChain([tlslite.X509().parse(cert)])
+    private_key = tlslite.parsePEMKey(private_key, private=True)
+    # Handshake with the server
+    sock.handshakeClientCert(cert, private_key, alpn=ALPN)
+
+    return sock
+
+if __name__ == "__main__":
+    sock = connect()
+    sock.write(b"Hello World!")
+    print(sock.read())
+    sock.close()
+