Add draft for autoreadme webhook service

tools/README-generator/webhook.py

@@ -0,0 +1,53 @@
+import subprocess
+import os
+
+from github_webhook import Webhook
+from flask import Flask
+from make_readme import generate_READMEs
+
+app = Flask(__name__)   # Standard Flask app
+webhook = Webhook(app)  # Defines '/postreceive' endpoint
+
+webhook.secret = open("github_webhook_secret", "r").read().strip()
+
+my_env = os.environ.copy()
+my_env["GIT_TERMINAL_PROMPT"] = "0"
+
+login = open("login").read().strip()
+token = open("token").read().strip()
+
+def git(cmd, in_folder=None):
+
+    if not isinstance(cmd, list):
+        cmd = cmd.split()
+    if in_folder:
+        cmd = ["-C", in_folder] + cmd
+    cmd = ["git"] + cmd
+    return subprocess.check_output(cmd, env=my_env).strip().decode("utf-8")
+
+
+@app.route("/")
+def main_route():
+    return "You aren't supposed to go on this page using a browser, it's for webhooks push instead."
+
+
+@webhook.hook()
+def on_push(data):
+
+    repository = data["repository"]["full_name"]
+    branch = data["ref"].split("/", 2)[2]
+
+    folder = subprocess.check_output(["mktemp", "-d"])
+    git(f"clone https://{login}:{token}@github.com/{repository} --single-branch --branch {branch} {folder}")
+    generate_READMEs(folder)
+
+    diff_not_empty = bool(subprocess.check_output(f"cd {folder} && git diff HEAD --compact-summary", shell=True).strip().decode("utf-8"))
+    if not diff_not_empty:
+        return
+
+    git(["commit", "-a", "-m", "Auto-update README", "--author='Yunohost-Bot <>'"], in_folder=folder)
+    git(f"push fork origin {branch} --quiet", in_folder=folder)
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=80123)