just some boilerplate for the project

.gitignore

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+__pycache__/

.vscode/settings.json

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+{
+    "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix"
+}

bridge/__init__.py

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+from flask import Flask
+from flask import request
+from flask import redirect
+from flask import abort
+
+app = Flask(__name__)
+app.config.from_envvar('GIT_BRIDGE_SETTINGS')
+
+@app.route("/bridge")
+def index():
+    return "you've reached the main page for an internal service. congrats!"

contrib/sample.cfg

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+SECRET_KEY="replace_me"

contrib/service.nix

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+{ lib, pkgs, config, ... }:
+let
+  cfg = config.services.gmail_mail_bridge;
+  appEnv = pkgs.python3.withPackages (p: with p; [ waitress (callPackage ./bridge/default.nix {}) ]);
+in {
+  options.services.gmail_mail_bridge = {
+    enable = lib.mkEnableOption "Enable the Gitea-Github bridge";
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.gmail_mail_bridge = {
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        ExecStart = "${appEnv}/bin/waitress-serve --port=8041 bridge:app";
+	      StandardOutput = "journal";
+      };
+    };
+  };
+}

default.nix

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+{ pkgs, pythonPackages ? (import <nixpkgs> {}).python3Packages }:
+pythonPackages.buildPythonPackage {
+  name = "gitea-github-bridge";
+  src = ./bridge;
+
+  propagatedBuildInputs = [ pythonPackages.flask pythonPackages.requests ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/${pythonPackages.python.sitePackages}
+    cp -r . $out/${pythonPackages.python.sitePackages}/bridge
+
+    runHook postInstall
+  '';
+
+  shellHook = "export FLASK_APP=bridge";
+
+  format = "other";
+}

shell.nix

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+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-24.05") {} }:
+
+pkgs.mkShell {
+  packages = [
+    (pkgs.python3.withPackages (ps: [
+      ps.flask
+      ps.requests
+    ]))
+
+    pkgs.curl
+    pkgs.jq
+  ];
+}