commit 94a278dbd440a0be780dda51d4165a8518b7fba0
Author: MathiasDPX <mathias@dupeux.net>
Date:   Thu Apr 17 15:07:44 2025 +0200

    initial commit

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..62c035d
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,9 @@
+db_name=""
+db_user=""
+db_password=""
+db_host=postgres.hackclub.app
+db_port=5432
+
+SYNC_SERVER_URL="sync.example.com"
+HOST="0.0.0.0"
+PORT=80
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8aa2837
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+syncfile.md
+doc.py
+
+index.json
+data/*
+.env
+
+__pycache__
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3d3d959
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+# Obsidian FreeSync
+Clone of the official [Obsidian Sync](https://obsidian.md/sync) backend for having Obsidian for free.
+
+Currently not secured and should don't support end-to-end encryption
\ No newline at end of file
diff --git a/database.py b/database.py
new file mode 100644
index 0000000..acecd41
--- /dev/null
+++ b/database.py
@@ -0,0 +1,272 @@
+import os
+import time
+import logging
+import psycopg2
+from os import getenv
+from glob import glob
+from dotenv import load_dotenv
+from typing import Optional, Any
+from psycopg2 import OperationalError
+
+load_dotenv()
+
+class DatabaseConnector:
+    def __init__(
+        self,
+        dbname: str,
+        user: str,
+        password: str,
+        host: str = "localhost",
+        port: int = 5432,
+        max_retries: int = 3,
+        retry_delay: int = 5
+    ):
+        """
+        Initialize database connector with connection parameters and retry settings.
+        
+        Args:
+            dbname: Database name
+            user: Database user
+            password: Database password
+            host: Database host
+            port: Database port
+            max_retries: Maximum number of reconnection attempts
+            retry_delay: Delay between retry attempts in seconds
+        """
+        self.conn_params = {
+            "dbname": dbname,
+            "user": user,
+            "password": password,
+            "host": host,
+            "port": port
+        }
+        self.max_retries = max_retries
+        self.retry_delay = retry_delay
+        self.conn: Optional[psycopg2.extensions.connection] = None
+        self.cur: Optional[psycopg2.extensions.cursor] = None
+        
+        # Set up logging
+        logging.basicConfig(
+            level=logging.INFO,
+            format='%(asctime)s - %(levelname)s - %(message)s'
+        )
+        self.logger = logging.getLogger(__name__)
+
+    def connect(self) -> bool:
+        """
+        Establish database connection.
+        
+        Returns:
+            bool: True if connection successful, False otherwise
+        """
+        try:
+            self.conn = psycopg2.connect(**self.conn_params)
+            self.cur = self.conn.cursor()
+            self.logger.info("Successfully connected to the database")
+            return True
+        except OperationalError as e:
+            self.logger.error(f"Error connecting to the database: {e}")
+            return False
+
+    def ensure_connection(self) -> bool:
+        """
+        Ensure database connection is active, attempt to reconnect if necessary.
+        
+        Returns:
+            bool: True if connection is active or reconnection successful
+        """
+        if self.conn and not self.conn.closed:
+            try:
+                # Test connection with simple query
+                self.cur.execute("SELECT 1")
+                return True
+            except (psycopg2.Error, AttributeError):
+                self.logger.warning("Database connection lost")
+                
+        # Connection is closed or failed, attempt to reconnect
+        for attempt in range(self.max_retries):
+            self.logger.info(f"Attempting to reconnect (attempt {attempt + 1}/{self.max_retries})")
+            if self.connect():
+                return True
+            time.sleep(self.retry_delay)
+        
+        self.logger.error("Failed to reconnect to database after multiple attempts")
+        return False
+
+    def execute_query(self, query: str, params: tuple = None) -> Optional[Any]:
+        """
+        Execute a database query with automatic reconnection on failure.
+        
+        Args:
+            query: SQL query string
+            params: Query parameters (optional)
+            
+        Returns:
+            Query results if successful, None if failed
+        """
+        if not self.ensure_connection():
+            return None
+
+        try:
+            self.cur.execute(query, params)
+            
+            # Check if query is a SELECT statement
+            if query.strip().upper().startswith("SELECT"):
+                results = self.cur.fetchall()
+                self.conn.commit()
+                return results
+            else:
+                self.conn.commit()
+                return True
+                
+        except psycopg2.Error as e:
+            self.logger.error(f"Error executing query: {e}")
+            self.conn.rollback()
+            return None
+
+    def close(self):
+        """Close database connection and cursor."""
+        if self.cur:
+            self.cur.close()
+        if self.conn:
+            self.conn.close()
+            self.logger.info("Database connection closed")
+
+db = DatabaseConnector(
+    dbname=getenv("db_name"),
+    user=getenv("db_user"),
+    password=getenv("db_password"),
+    host=getenv("db_host"),
+    port=getenv("db_port")
+)
+
+def register(email:str, password:str, name:str="unnamed"):
+    db.execute_query("INSERT INTO users (email,password,name) VALUES (%s,%s,%s)", (email,password,name,))
+
+def get_userid_by_token(token:str):
+    result = db.execute_query("SELECT uid FROM users WHERE token=%s LIMIT 1", (token,))
+    return result[0]
+
+def login(email, password):
+    result = db.execute_query("SELECT name,token FROM users WHERE email=%s AND password=%s LIMIT 1", (email,password,))
+
+    if len(result) == 0:
+        return {"error": "Invalid email or password"}
+
+    return {
+        "email": email,
+        "license": "",
+        "name": result[0][0],
+        "token": result[0][1]
+    }
+
+def get_userinfo(token:str):
+    result = db.execute_query("SELECT uid,name,email FROM users WHERE token=%s LIMIT 1", (token,))
+    if len(result) == 0:
+        return {"error": "Not logged in"}
+    
+    userdata = result[0]
+
+    return {
+        "credit": 0,
+        "credit_received": 0,
+        "discount": None,
+        "email": userdata[2],
+        "license": "",
+        "mfa": False,
+        "name": userdata[1],
+        "payment": "",
+        "uid": userdata[0]
+    }
+
+def list_vaults(token:str):
+    uid = get_userid_by_token(token)
+    raw_data = db.execute_query("SELECT v.* FROM vaults v WHERE v.owner = %s", (uid,))
+    vaults = []
+
+    for vault in raw_data:
+        size = 0
+
+        for file in glob("data/*"):
+            size += os.path.getsize(file)
+
+        vaults.append({
+            "created": int(vault[2].timestamp()*1000),
+            "encryption_version": 0,
+            "host": getenv("SYNC_SERVER_URL"),
+            "id": vault[0],
+            "name": vault[1],
+            "password": "",
+            "region": "Home",
+            "salt": "sugar",
+            "size": size
+        })
+
+    return {"limit":len(raw_data)+1,"shared":[],"vaults":vaults}
+
+def create_vault(name:str, token:str):
+    uid = get_userid_by_token(token)
+    db.execute_query("INSERT INTO vaults (name,owner) VALUES (%s, %s)", (name, uid))
+    data = db.execute_query("SELECT * FROM vaults WHERE owner=%s AND name=%s ORDER BY created_at DESC LIMIT 1;", (uid,name,))
+    data = data[0]
+
+    return {
+        "created": int(data[2].timestamp()*1000),
+        "encrypted_version": 0,
+        "host": os.getenv("SYNC_SERVER_URL"),
+        "id": data[0],
+        "name": data[1],
+        "password": "",
+        "region": "Home",
+        "salt": "sugar",
+        "size": 0
+    }
+
+def rename_vault(name:str, id:str, token:str):
+    uid = get_userid_by_token(token)
+    db.execute_query("UPDATE vaults SET name=%s WHERE id=%s AND owner=%s", (name, id, uid))
+    return {}
+
+def delete_database(vault_id:str, token:str):
+    uid = get_userid_by_token(token)
+    db.execute_query("DELETE FROM vaults WHERE id=%s AND owner=%s", (vault_id, uid,))
+    return {}
+
+def get_file(vault_id, path):
+    data = db.execute_query("SELECT * FROM vault_files WHERE vault_id=%s AND path=%s LIMIT 1", (vault_id, path,))
+    return data
+
+def get_files(vault_id):
+    return db.execute_query("SELECT * FROM vault_files WHERE vault_id=%s", (vault_id,))
+
+def add_file(vault_id:str, path:str, hash:str, user_id:int, file_content:bytes):
+    db.execute_query("INSERT INTO vaults_files (vault_id, path, hash, user_id, file_content) VALUES (%s, %s, %s, %s, %s)",
+                     (vault_id, path, hash, user_id, file_content))
+
+if __name__ == "__main__":
+    db.execute_query("""CREATE TABLE vaults_files (
+                        vault_id VARCHAR(255) NOT NULL REFERENCES vaults(id),
+                        uid SERIAL PRIMARY KEY,
+                        path TEXT,
+                        hash TEXT,
+                        user_id INTEGER,
+                        file_content BYTEA,
+                        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                        modified_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+                    );""")
+    
+    db.execute_query("""CREATE TABLE IF NOT EXISTS users (
+                        uid VARCHAR(255) PRIMARY KEY DEFAULT gen_random_uuid()::text,
+                        name VARCHAR(255) NOT NULL,
+                        email VARCHAR(255) NOT NULL,
+                        password VARCHAR(255) NOT NULL,
+                        token VARCHAR(255)
+                     );""")
+    
+    db.execute_query("""CREATE TABLE IF NOT EXISTS vaults (
+                        id VARCHAR(255) PRIMARY KEY DEFAULT gen_random_uuid()::text,
+                        name VARCHAR(255) NOT NULL DEFAULT 'Unnamed',
+                        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                        owner VARCHAR(255) NOT NULL REFERENCES users(uid),
+                        shared VARCHAR(255)[] DEFAULT '{}'
+                     );""")
\ No newline at end of file
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..9b3bd09
--- /dev/null
+++ b/main.py
@@ -0,0 +1,269 @@
+from flask import Flask, request, make_response
+from dotenv import load_dotenv
+from flask_sock import Sock
+from glob import glob
+import database
+import json
+import os
+
+load_dotenv()
+app = Flask(__name__)
+sock = Sock(app)
+
+def make_resp(data=''):
+    response = make_response(data)
+    
+    response.status_code = 200
+    response.headers['access-control-allow-origin'] = 'app://obsidian.md'
+    response.headers['access-control-allow-headers'] = 'content-type'
+    
+    return response
+
+index = json.load(open("index.json", "r", encoding="utf-8"))
+
+def save_index():
+    with open("index.json", "w+") as f:
+        json.dump(index, f, indent=4)
+
+@sock.route("/")
+def websocket(ws):
+    vault_id = None
+    device_name = "unknown"
+    while True:
+        raw = ws.receive()
+        data = json.loads(raw)
+
+        operation = data.get("op")
+
+        if operation == "init":
+            ws.send(json.dumps({"res": "ok", "perFileMax": 2147483647, "userId": 1}))
+            ws.send(json.dumps({"op": "ready", "version": 11}))
+
+            for vault in database.list_vaults(data.get("token"))['vaults']:
+                if vault['id'] != vault_id:
+                    ws.close()
+
+            vault_id = data.get("id")
+            device_name = data.get("device", "unknown")
+            for path, data in index["files"].items():
+                filesize = os.path.getsize(f"data/{path}")
+                ws.send(json.dumps({
+                    "op": "push",
+                    "path": path,
+                    "hash": data['hash'],
+                    "size": filesize,
+                    "ctime": data["ctime"],
+                    "mtime": data["mtime"],
+                    "folder": False,
+                    "device": device_name,
+                    "uid": index["id"].index(path)
+                }))
+
+            for path, data in index["folders"].items():
+                ws.send(json.dumps({
+                    "op": "push",
+                    "path": path,
+                    "hash": data['hash'],
+                    "size": 0,
+                    "ctime": 0,
+                    "mtime": 0,
+                    "folder": True,
+                    "device": device_name,
+                    "uid": index["id"].index(path)
+                }))
+
+        if operation == "pull":
+            uid = data['uid']
+            path = index["id"][uid]
+            ws.send(json.dumps({
+                "hash": index["files"][path]['hash'],
+                "size": os.path.getsize(f"data/{path}"),
+                "pieces": 1
+            }))
+            ws.send(open(f'data/{path}', "rb").read())
+
+        if operation == "ping":
+            ws.send(json.dumps({"op":"pong"}))
+
+        if operation == "size":
+            size = 0
+            for file in glob("data/*"):
+                size += os.path.getsize(file)
+            ws.send(json.dumps({"res":"ok","size":size,"vault_size":0,"limit":1099511627776})) # 1To
+
+        if operation == "deleted":
+            return {"items":[]}
+        
+        if operation == "push":
+            path = data.get("path")
+            hash = data.get("hash")
+
+            if data.get("deleted", False):
+                index["id"].remove(path)
+                del index["files"][path]
+
+            index["id"].append(path)
+            if data.get("folder", False):
+                index["folders"][path] = {"hash": hash}
+                save_index()
+                continue
+            else:
+                index["files"][path] = {
+                    "hash": hash,
+                    "ctime": data.get("ctime"),
+                    "mtime": data.get("mtime"),
+                    "device": device_name
+                }
+                save_index()
+
+            if data.get("pieces") == 1:
+                # Client will give us file content
+                ws.send(json.dumps({"res":"next"}))
+                file = ws.receive()
+                with open(f"data/{path}", "wb+") as f:
+                    f.write(file)
+            
+            ws.send(raw)
+            ws.send(json.dumps({"op":"ok"}))
+
+        if operation == "usernames": # TODO
+            ws.send(json.dumps({"1": "Mathias"}))
+
+@app.route("/user/info", methods=["POST", "OPTIONS"])
+def user_info():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+
+    return make_resp(database.get_userinfo(data.get("token")))
+
+@app.route("/user/signout", methods=["POST", "OPTIONS"])
+def user_signout():
+    if request.method == "OPTIONS": return make_resp()
+    return make_resp({})
+
+@app.route("/user/signin", methods=["POST", "OPTIONS"])
+def user_signin():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+
+    return make_resp(
+        database.login(data["email"], data["password"])
+    )
+
+@app.route("/vault/list", methods=["POST", "OPTIONS"])
+def vault_list():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+    
+    return make_resp(database.list_vaults(data.get("token")))
+
+@app.route("/vault/regions", methods=["POST", "OPTIONS"])
+def vault_regions():
+    if request.method == "OPTIONS": return make_resp()
+
+    return make_resp({
+        "regions": [
+            {
+                "name": "Home",
+                "value": "home"
+            }
+        ]
+    })
+
+@app.route("/vault/create", methods=["POST", "OPTIONS"])
+def vault_create():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+    
+    if data.get("encryption_version") != 0:
+        return {"error": "End2End encryption not supported"}
+    
+    return make_resp(database.create_vault(data.get("name", "my awesome vault"), data.get("token")))
+
+@app.route("/subscription/business", methods=["POST", "OPTIONS"])
+def subscription_business():
+    if request.method == "OPTIONS": return make_resp()
+    return {}
+
+@app.route("/subscription/list", methods=["POST", "OPTIONS"])
+def subscription_list():
+    if request.method == "OPTIONS": return make_resp()
+    return make_resp({"business":None,"publish":None,"sync":{"earlybird":False,"expiry_ts":1747156338125,"plan":"basic_1","renew":""},"syncPlans":[{"code":"basic_1","display":"Standard 1 GB","monthly":500,"perFileMax":6291456,"revisionHistoryDays":31,"storage":1073741824,"vaults":1,"yearly":4800},{"code":"standard_10","display":"Plus 10 GB","monthly":1000,"perFileMax":209715200,"revisionHistoryDays":365,"storage":10737418240,"vaults":10,"yearly":9600},{"code":"standard_100","display":"Plus 100 GB","monthly":2000,"perFileMax":209715200,"revisionHistoryDays":365,"storage":107374182400,"vaults":10,"yearly":19200}]})
+
+@app.route("/vault/access", methods=["POST", "OPTIONS"])
+def vault_access():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+
+    userinfo = database.get_userinfo(data.get("token"))
+    
+    return make_resp({
+        "allowed": True,
+        "email": userinfo['email'],
+        "encryption_version": 0,
+        "name": userinfo['name'],
+        "useruid": userinfo['uid']
+    })
+
+@app.route("/vault/delete", methods=["POST", "OPTIONS"])
+def vault_delete():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+
+    return make_resp(database.delete_database(data.get("vault_uid"), data.get("token")))
+
+@app.route("/vault/rename", methods=["POST", "OPTIONS"])
+def vault_rename():
+    if request.method == "OPTIONS": return make_resp()
+    data = request.json
+    return make_resp(database.rename_vault(data.get("name"), data.get("vault_uid"), data.get("token")))
+
+@app.route("/vault/share/list", methods=["POST", "OPTIONS"])
+def vault_share_list():
+    if request.method == "OPTIONS": return make_resp()
+    return make_resp(json.dumps({"shares":[]}))
+    """
+    POST:{
+        "vault_uid": "",
+        +token
+    }
+    RESPONSE:{
+        "shares": [
+            {
+                "accepted": false,
+                "code": "",
+                "email": "",
+                "uid": ""
+            }
+        ]
+    }
+    """
+
+@app.route("/vault/share/invite", methods=["POST", "OPTIONS"])
+def vault_share_invite():
+    if request.method == "OPTIONS": return make_resp()
+    return make_resp(json.dumps({}))
+    """
+    POST:{
+        "email": "",
+        "vault_uid": "",
+        +token
+    }
+    RESPONSE:{}
+    """
+
+@app.route("/vault/share/remove", methods=["POST", "OPTIONS"])
+def vault_share_remove():
+    """
+    POST:{
+        "share_uid": "",
+        "vault_uid": ""
+        +token
+    }
+    RESPONSE:{}
+    """
+
+sock.init_app(app)
+
+if __name__ == "__main__":
+    app.run(host=os.getenv("HOST"), port=os.getenv("PORT"))
\ No newline at end of file
diff --git a/redirect.py b/redirect.py
new file mode 100644
index 0000000..ca5f8e1
--- /dev/null
+++ b/redirect.py
@@ -0,0 +1,19 @@
+from mitmproxy import http
+
+class ObsidianRedirect:
+    def request(self, flow: http.HTTPFlow) -> None:
+        #return
+        if flow.request.pretty_host == "sync-32.obsidian.md":
+            flow.request.scheme = "http"
+            flow.request.host = "localhost"
+            flow.request.port = 5000
+            flow.request.headers["Host"] = "sync-32.obsidian.md"
+
+        if flow.request.pretty_host == "api.obsidian.md":
+            flow.request.scheme = "http"
+            flow.request.host = "localhost"
+            flow.request.port = 5000
+            
+            flow.request.headers["Host"] = "api.obsidian.md"
+
+addons = [ObsidianRedirect()]
\ No newline at end of file