some initial ideas -- needs to be cleaned up a lot

.gitignore

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+tfbbridge.sqlite3
+__pycache__/
+*.pyc

.vscode/settings.json

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

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs; [
+        buildPackages.python311Packages.requests
+        buildPackages.python311Packages.flask
+    ];
+}

tfbbridge/__init__.py

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+from flask import Flask, request, render_template, g, redirect
+import requests
+from .dbutils import get_and_init_db, get_db
+from .groupme import group_sharing_url_to_id
+import json
+import uuid
+
+app = Flask(__name__)
+app.config.from_mapping(
+    DATABASE_LOCATION = "tfbbridge.sqlite3",
+    BOT_ID = "4b841d36f2a0788192b5375335"
+)
+
+@app.route("/")
+def testing():
+    return "testing"
+
+@app.route("/add_bot", methods=["GET", "POST"])
+def add_bot():
+    if request.method == "GET":
+        return render_template("add_new.html")
+    elif request.method == "POST":
+        try:
+            url = request.form["chaturl"]
+            try:
+                group_id = group_sharing_url_to_id(url)
+            except:
+                return "Bad URL", 400
+
+            db = get_db()
+            try:
+                db.execute(
+                    "INSERT INTO child_groups (group_id) VALUES (?)",
+                    (group_id,),
+                )
+                db.commit()
+            except db.IntegrityError:
+                return "This group is already registered."
+
+            bot_id = app.config["BOT_ID"]
+            print(bot_id)
+
+            requests.post("https://api.groupme.com/v3/bots?token={}".format(bot_id))
+
+            return url
+
+        except KeyError:
+            return "Bad URL", 400
+    else:
+        return "Invalid Method", 400
+
+@app.route("/list_child_groups")
+def list_child_groups():
+    db = get_db()
+    cursor = db.cursor()
+    cursor.execute('SELECT group_id FROM child_groups')
+    results = cursor.fetchall()
+    groups = [i[0] for i in results]
+    return groups
+
+@app.route("/groupme/oauth_callback")
+def oauth_callback():
+    token = request.args.get("access_token")
+    print(token)
+
+    r = requests.get("https://api.groupme.com/v3/groups?token={}".format(token))
+    data = r.json()["response"]
+    data = [
+        {
+            "group_id": i["group_id"],
+            "name": i["name"],
+        }
+    for i in data]
+
+    return render_template("what_group.html", groups=data, token=token)
+
+@app.route("/groupme/add_group", methods=["POST"])
+def add_group():
+    token = request.form["token"]
+    target_group = request.form["to_add"]
+    print(target_group)
+
+    print(token, target_group)
+
+    headers = {
+        'Content-Type': 'application/json',
+    }
+
+    params = {
+        'token': token,
+    }
+
+    json_data = {
+        'bot': {
+            'name': 'tfbbot',
+            'group_id': target_group,
+        },
+    }
+
+    r = requests.post('https://api.groupme.com/v3/bots', params=params, headers=headers, json=json_data)
+
+    payload = r.json()
+    bot_id = payload["response"]["bot_id"]
+
+    return r.text
+
+@app.route("/groupme/authorize")
+def authorize():
+    return redirect(
+        "https://oauth.groupme.com/oauth/authorize?client_id=SgAPMhA6H1UuBE2QD2O5JE1BM6WnysRu6AP1ib6jQsqrH3QA",
+    )
+
+@app.route("/groupme/create_organization", methods=["GET", "POST"])
+def create_organization():
+    if request.method == "GET":
+        return render_template("new_org.html")
+    elif request.method == "POST":
+        name = request.form["orgname"]
+
+        db = get_db()
+        try:
+            db.execute(
+                "INSERT INTO organizations (org_name, admin_url, addition_url) VALUES (?, ?, ?)",
+                (name, uuid.uuid4().hex, uuid.uuid4().hex,),
+            )
+            db.commit()
+
+            return "testing"
+        except db.IntegrityError:
+            return "This group is already registered."
+
+@app.route("/groupme/list_orgs")
+def list_orgs():
+    db = get_db()
+    cursor = db.cursor()
+    cursor.execute('SELECT * FROM organizations')
+    results = cursor.fetchall()
+    results = [(i[0], i[1], i[2], i[3]) for i in results]
+    print(results)
+    return results
+
+@app.route("/groupme/org_info/<org>")
+def org_info(org):
+    db = get_db()
+    cursor = db.cursor()
+    cursor.execute('SELECT id, org_name FROM organizations WHERE admin_url=?', (org,))
+    org_id, name = cursor.fetchone()
+
+    cursor.execute('SELECT group_name, group_id, bot_id, chan_type FROM channels WHERE organization=?', (org_id,))
+    results = cursor.fetchall()
+    results = [
+        {
+            "name": i[0],
+            "group_id": i[1],
+            "bot_id": i[2],
+            "chan_type": i[3],
+        }
+    for i in results]
+    return results
+
+@app.route("/groupme/add_chan_to_org/<org>")
+def add_chan_to_org(org):
+    db = get_db()
+    cursor = db.cursor()
+    cursor.execute('SELECT id, org_name FROM organizations WHERE addition_url=?', (org,))
+    org_id, name = cursor.fetchone()
+    return redirect(
+        "https://oauth.groupme.com/oauth/authorize?client_id=SgAPMhA6H1UuBE2QD2O5JE1BM6WnysRu6AP1ib6jQsqrH3QA&state=" + org,
+    )

tfbbridge/dbutils.py

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+"""
+Database shenanigans
+"""
+
+import sqlite3
+import os
+from flask import current_app, g
+
+def get_and_init_db(database: str):
+    # check if the file exists first
+    new_database = not os.path.exists(database)
+
+    db = sqlite3.connect(
+        database,
+        detect_types=sqlite3.PARSE_DECLTYPES
+    )
+    db.row_factory = sqlite3.Row
+
+    if new_database:
+        with current_app.open_resource("schema.sql") as handle:
+            schema = handle.read().decode('utf8')
+            db.executescript(schema)
+
+        print("I've initialized the database!")
+
+    return db
+
+def get_db():
+    # given a global object, populate it if necessary and return the db
+
+    if 'db' not in g:
+        g.db = get_and_init_db(current_app.config["DATABASE_LOCATION"])
+    
+    return g.db

tfbbridge/groupme.py

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+# misc groupme utilities
+
+from urllib.parse import urlparse
+
+def group_sharing_url_to_id(url: str) -> str:
+    """
+    Convert a GroupMe group sharing url to an ID.
+
+    For example, given a URL https://groupme.com/join_group/91994372/901HvAj3, the
+    returned ID should be 91994372.
+
+    The return type is a string because of BigNum future concerns.
+    """
+
+    parsed = urlparse(url)
+    splitted = parsed.path.split('/')
+    group_id = splitted[2]
+
+    return group_id

tfbbridge/schema.sql

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+DROP TABLE IF EXISTS child_groups;
+DROP TABLE IF EXISTS parent_groups;
+
+CREATE TABLE organizations (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    org_name TEXT NOT NULL,
+    admin_url TEXT UNIQUE NOT NULL,
+    addition_url TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE channels (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    group_name TEXT NOT NULL,
+    group_id TEXT UNIQUE NOT NULL,
+    bot_id TEXT UNIQUE,
+    /*
+    chan_type enum
+    1: a channel that recieves only announcements -- no one within may send things.
+    2: a channel that can recieve annonuncements, and select people can send announcements.
+    3: a channel in which everyone can send announcements.
+    */
+    chan_type TEXT CHECK( chan_type in ('1', '2', '3') ) NOT NULL,
+    organization INTEGER NOT NULL,
+    FOREIGN KEY(organization) REFERENCES organizations(id)
+);
+
+CREATE TABLE allowlisted_users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id TEXT NOT NULL,
+    channel INTEGER NOT NULL,
+    FOREIGN KEY(channel) REFERENCES channels(id)
+);

tfbbridge/templates/add_new.html

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+{% block title %}Add bot{% endblock %}
+
+{% block content %}
+    <form method="post">
+        <label for="chaturl">GroupMe Chat URL</label>
+        <input name="chaturl" id="chaturl" required>
+        <input type="submit" value="Add bot!">
+    </form>
+{% endblock %}

tfbbridge/templates/base.html

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+<!DOCTYPE html>
+
+<head>
+    <title>{% block title %}{% endblock %}</title>
+    <link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
+</head>
+<body>
+    {% block content %}{% endblock %}
+</body>

tfbbridge/templates/new_org.html

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+{% block title %}New organization{% endblock %}
+
+{% block content %}
+    <form method="post">
+        <label for="orgname">Organization name</label>
+        <input name="orgname" id="orgname" required>
+        <input type="submit" value="Create organization!">
+    </form>
+{% endblock %}

tfbbridge/templates/what_group.html

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+{% block title %}Add bot{% endblock %}
+
+{% block content %}
+    <form method="post" action="/groupme/add_group">
+    {% for group in groups %}
+        <input type="radio" id="{{ group.group_id }}" name="to_add" value="{{ group.group_id }}">
+        <label for="{{ group.group_id }}">{{ group.name }}</label>
+    {% endfor %}
+    <input type="hidden" name="token" value="{{ token }}">
+    <input type="submit" value="Add this group">
+    </form>
+{% endblock %}