refactor: prepare backend refactor

2026-07-14 16:54:40 +08:00
parent 0f674d0483
commit 26dce7ce80
19 changed files with 183 additions and 15 deletions
--- a/backend-legacy/.gitignore
+++ b/backend-legacy/.gitignore
@@ -0,0 +1,19 @@
+## ======== Personal ========
+# Database file
+*.db
+
+# Ignore setting file
+coconut-leaf.toml
+
+## ======== Python ========
+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
+
--- a/backend-legacy/.python-version
+++ b/backend-legacy/.python-version
@@ -0,0 +1 @@
+3.11
--- a/backend-legacy/README.md
+++ b/backend-legacy/README.md
--- a/backend-legacy/coconut-leaf.py
+++ b/backend-legacy/coconut-leaf.py
@@ -0,0 +1,84 @@
+import sys
+from argparse import ArgumentParser
+from typing import cast
+from pathlib import Path
+
+import server
+import config
+import utils
+import database
+import logger
+from logger import LOGGER, LoggerLevel
+
+
+def GetUsernamePassword() -> tuple[str, str]:
+    print("What is the first username of this calendar system?")
+    cache = input()
+    while not utils.IsValidUsername(cache):
+        print("Sorry, invalid data. Please try again.")
+        cache = input()
+    username = cache
+
+    print("Input this user password:")
+    cache = input()
+    while not utils.IsValidPassword(cache):
+        print("Sorry, invalid data. Please try again.")
+        cache = input()
+    password = cache
+
+    return (username, password)
+
+if __name__ == "__main__":
+    # Set as INFO level in default first,
+    # and we will change it once we load the configuration file.
+    logger.set_level(LoggerLevel.INFO)
+
+    # Receive arguments
+    parser = ArgumentParser(
+        description="The server of light, self-host and multi-account calendar system."
+    )
+    parser.add_argument(
+        "-c",
+        "--config",
+        required=True,
+        type=Path,
+        action="store",
+        metavar="CONFIG_TOML",
+        dest="config",
+        help="The configuration file for coconut-leaf",
+    )
+    parser.add_argument(
+        "-i",
+        "--init",
+        action="store_true",
+        dest="init",
+        help="Set for initialize the calendar system",
+    )
+    args = parser.parse_args()
+
+    # Show splash
+    LOGGER.info("Coconut-leaf")
+    LOGGER.info("A light, self-host and multi-account calendar system")
+    LOGGER.info("Project: https://github.com/yyc12345/coconut-leaf")
+    LOGGER.info("===================")
+
+    # Load config file
+    try:
+        config.setup_config(cast(Path, args.config))
+    except Exception as e:
+        LOGGER.critical(f"Error loading config file: {e}")
+        sys.exit(1)
+
+    # Change logging level again according to whether enable debug mode
+    logging_level = LoggerLevel.DEBUG if config.get_config().others.debug else LoggerLevel.INFO
+    logger.set_level(logging_level)
+
+    # Initialize the calendar system if needed
+    if cast(bool, args.init):
+        gotten_data = GetUsernamePassword()
+        calendar = database.CalendarDatabase()
+        calendar.init(*gotten_data)
+        calendar.close()
+
+    LOGGER.info("Staring server...")
+    server.run()
--- a/backend-legacy/coconut-leaf.template.toml
+++ b/backend-legacy/coconut-leaf.template.toml
@@ -0,0 +1,22 @@
+[database]
+driver = "sqlite"
+
+[database.config]
+path = "coconut-leaf.db"
+
+# [database]
+# driver = "mysql"
+# 
+# [database.config]
+# host = "localhost"
+# port = 3306
+# user = "root"
+# password = "password"
+# database = "coconut_leaf"
+
+[web]
+port = 8848
+
+[others]
+auto-token-clean-duration = 86400
+debug = true
--- a/backend-legacy/config.py
+++ b/backend-legacy/config.py
@@ -0,0 +1,130 @@
+import tomllib
+from dataclasses import dataclass
+from enum import StrEnum
+from typing import Optional
+from pathlib import Path
+
+
+class DatabaseDriver(StrEnum):
+    SQLITE = "sqlite"
+    MYSQL = "mysql"
+
+    @staticmethod
+    def from_raw(raw: dict):
+        return DatabaseDriver(raw["driver"])
+
+
+@dataclass(frozen=True)
+class SqliteDatabaseConfig:
+    path: str
+    """Database path"""
+
+    @staticmethod
+    def from_raw(raw: dict):
+        return SqliteDatabaseConfig(raw["path"])
+
+
+@dataclass(frozen=True)
+class MysqlDatabaseConfig:
+    host: str
+    """Database host"""
+    port: int
+    """Database port"""
+    user: str
+    """Database user"""
+    password: str
+    """Database password"""
+    database: str
+    """Database name"""
+
+    @staticmethod
+    def from_raw(raw: dict):
+        return MysqlDatabaseConfig(
+            raw["host"], raw["port"], raw["user"], raw["password"], raw["database"]
+        )
+
+
+@dataclass(frozen=True)
+class DatabaseConfig:
+    driver: DatabaseDriver
+    """Database driver"""
+    config: SqliteDatabaseConfig | MysqlDatabaseConfig
+    """Database config"""
+
+    @staticmethod
+    def from_raw(raw: dict):
+        if raw["driver"] == DatabaseDriver.SQLITE:
+            return DatabaseConfig(
+                DatabaseDriver.SQLITE, SqliteDatabaseConfig.from_raw(raw["config"])
+            )
+        elif raw["driver"] == DatabaseDriver.MYSQL:
+            return DatabaseConfig(
+                DatabaseDriver.MYSQL, MysqlDatabaseConfig.from_raw(raw["config"])
+            )
+        else:
+            raise ValueError("Invalid database driver")
+
+
+@dataclass(frozen=True)
+class WebConfig:
+    port: int
+    """Web server port"""
+
+    @staticmethod
+    def from_raw(raw: dict):
+        return WebConfig(raw["port"])
+
+
+@dataclass(frozen=True)
+class OthersConfig:
+    debug: bool
+    """Whether enable debug mode"""
+    auto_token_clean_duration: int
+    """Auto token clean duration"""
+    
+    @staticmethod
+    def from_raw(raw: dict):
+        return OthersConfig(raw["debug"], raw["auto-token-clean-duration"])
+
+
+@dataclass(frozen=True)
+class Config:
+    database: DatabaseConfig
+    web: WebConfig
+    others: OthersConfig
+
+    @staticmethod
+    def from_raw(raw: dict):
+        return Config(
+            database=DatabaseConfig.from_raw(raw["database"]),
+            web=WebConfig.from_raw(raw["web"]),
+            others=OthersConfig.from_raw(raw["others"]),
+        )
+
+
+_CONFIG: Optional[Config] = None
+
+
+def setup_config(p: Path) -> None:
+    """
+    Setup config by given path.
+
+    Raise exception if config file is invalid.
+    """
+    with open(p, "rb") as f:
+        raw = tomllib.load(f)
+
+    global _CONFIG
+    _CONFIG = Config.from_raw(raw)
+
+
+def get_config() -> Config:
+    """
+    Get config instance.
+
+    Raises RuntimeError if config is not loaded.
+    """
+    if _CONFIG is None:
+        raise RuntimeError("Config is not loaded. Call setup_config() first.")
+    else:
+        return _CONFIG
--- a/backend-legacy/database.py
+++ b/backend-legacy/database.py
@@ -0,0 +1,708 @@
+import sqlite3
+import threading
+from typing import cast
+from pathlib import Path
+from dataclasses import dataclass
+from typing import Callable, ParamSpec, TypeVar, Generic
+
+import dt
+import utils
+import config
+from logger import LOGGER
+
+
+T = TypeVar('T')
+P = ParamSpec('P')
+R = TypeVar('R')
+
+
+@dataclass(frozen=True)
+class ResponseBody(Generic[T]):
+    """The generic response body for API return."""
+
+    success: bool
+    """True if this operation is successful, otherwise false."""
+    error: str
+    """The error message provided when operation failed."""
+    data: T | None
+    """The payload provided when operation successed."""
+
+
+class DbException(Exception):
+    """Error occurs when manipulating with database."""
+    pass
+
+
+def SafeDatabaseOperation(inner: Callable[P, R]) -> Callable[P, ResponseBody[R]]:
+    def wrapper(*args, **kwargs) -> ResponseBody[R]:
+        # extract self from args
+        self: 'CalendarDatabase' = args[0]
+        # get config
+        cfg = config.get_config()
+
+        with self.mutex:
+            # try to fetching database and allocate database cursor
+            try:
+                db = self._get_db()
+                self._allocate_cursor()
+            except Exception as e:
+                self._free_cursor()
+                if cfg.others.debug:
+                    LOGGER.exception(e)
+                return ResponseBody(False, str(e), None)
+
+            # do real data work
+            try:
+                currentTime = utils.GetCurrentTimestamp()
+                if currentTime - self.latestClean > cfg.others.auto_token_clean_duration:
+                    self.latestClean = currentTime
+                    LOGGER.info('Cleaning outdated token...')
+                    self.tokenOper_clean()
+
+                result = ResponseBody(True, '', inner(*args, **kwargs))
+                self._free_cursor()
+                db.commit()
+                return result
+            except Exception as e:
+                self._free_cursor()
+                db.rollback()
+                if cfg.others.debug:
+                    LOGGER.exception(e)
+                return ResponseBody(False, str(e), None)
+
+    return wrapper
+
+class CalendarDatabase:
+
+    db: sqlite3.Connection | None
+    cursor: sqlite3.Cursor | None
+    mutex: threading.Lock
+    latestClean: int
+
+    def __init__(self):
+        self.db = None
+        self.cursor = None
+        self.mutex = threading.Lock()
+        self.latestClean = 0
+
+    def open(self):
+        if (self.db is not None):
+            raise DbException('Database is already opened')
+
+        cfg = config.get_config()
+        match cfg.database.driver:
+            case config.DatabaseDriver.SQLITE:
+                self.db = sqlite3.connect(cast(config.SqliteDatabaseConfig, cfg.database.config).path, check_same_thread = False)
+                self.db.execute('PRAGMA encoding = "UTF-8";')
+                self.db.execute('PRAGMA foreign_keys = ON;')
+            case config.DatabaseDriver.MYSQL:
+                raise DbException('Not implemented database')
+            case _:
+                raise DbException('Unknow database type')
+
+    def init(self, username: str, password: str):
+        if (self.db is not None):
+            raise DbException('Database is already opened')
+
+        # establish tables
+        cfg = config.get_config()
+        backend_path = Path(__file__).resolve().parent
+        backend_sql_path = backend_path / 'sql'
+        match cfg.database.driver:
+            case config.DatabaseDriver.SQLITE:
+                sql_file = backend_sql_path / 'sqlite.sql'
+            case config.DatabaseDriver.MYSQL:
+                raise DbException('Not implemented database')
+            case _:
+                raise DbException('Unknow database type')
+
+        self.open()
+        db = self._get_db()
+
+        self._allocate_cursor()
+        cursor = self._get_cursor()
+
+        # execute script for creating tables
+        with open(sql_file, 'r', encoding='utf-8') as fsql:
+            cursor.executescript(fsql.read())
+        # add default user in user table
+        cursor.execute('INSERT INTO user VALUES (?, ?, ?, ?);', (
+            username,
+            utils.ComputePasswordHash(password),
+            1,
+            utils.GenerateSalt()
+        ))
+
+        self._free_cursor()
+
+        # commit to database
+        db.commit()
+
+    def close(self):
+        if (self.db is None):
+            LOGGER.warning('Try to close null database.')
+        else:
+            self._free_cursor()
+            self.db.close()
+            self.db = None
+
+    def _get_db(self) -> sqlite3.Connection:
+        if (self.db is None):
+            raise DbException('There is no opened database')
+        else:
+            return self.db
+
+    def _allocate_cursor(self) -> None:
+        if (self.cursor is not None):
+            raise DbException('There is already opened database cursor')
+        else:
+            self.cursor = self._get_db().cursor()
+
+    def _get_cursor(self) -> sqlite3.Cursor:
+        if (self.cursor is None):
+            raise DbException('There is no opened database cursor')
+        else:
+            return self.cursor
+
+    def _free_cursor(self) -> None:
+        if (self.cursor is None):
+            LOGGER.warning('Try to free null databse cursor.')
+        else:
+            self.cursor.close()
+            self.cursor = None
+
+    # ======================= token related internal operation
+    def tokenOper_clean(self):
+        # remove outdated token
+        cursor = self._get_cursor()
+        cursor.execute('DELETE FROM token WHERE [token_expire_on] <= ?',(utils.GetCurrentTimestamp(), ))
+
+    def tokenOper_postpone_expireOn(self, token):
+        cursor = self._get_cursor()
+        cursor.execute('UPDATE token SET [token_expire_on] = ? WHERE [token] = ?;', (
+            utils.GetTokenExpireOn(),
+            token
+        ))
+
+    def tokenOper_check_valid(self, token):
+        self.tokenOper_get_username(token)
+
+    def tokenOper_is_admin(self, username):
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [is_admin] FROM user WHERE [name] = ?;',(username, ))
+        cache = cursor.fetchone()[0]
+        return cache == 1
+
+    def tokenOper_get_username(self, token):
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [user] FROM token WHERE [token] = ? AND [token_expire_on] > ?;',(
+            token,
+            utils.GetCurrentTimestamp()
+        ))
+        result = cursor.fetchone()[0]
+        # need postpone expire on time
+        self.tokenOper_postpone_expireOn(token)
+        return result
+        
+    # =============================== # =============================== operation function
+    # =============================== common
+    
+    @SafeDatabaseOperation
+    def common_salt(self, username):
+        cursor = self._get_cursor()
+        salt = utils.GenerateSalt()
+        cursor.execute('UPDATE user SET [salt] = ? WHERE [name] = ?;', (
+            salt,
+            username
+        ))
+        return salt
+
+    @SafeDatabaseOperation
+    def common_login(self, username, password, clientUa, clientIp):
+        cursor = self._get_cursor()
+        cursor.execute('SELECT [password], [salt] FROM user WHERE [name] = ?;', (username, ))
+        (gotten_salt, gotten_password) = cursor.fetchone()
+        
+        if password == utils.ComputePasswordHashWithSalt(gotten_password, gotten_salt):
+            token = utils.GenerateToken(username)
+            cursor.execute('UPDATE user SET [salt] = ? WHERE [name] = ?;', (
+                utils.GenerateSalt(), # regenerate a new slat to prevent re-login try
+                username
+            ))
+            cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
+                username,
+                token,
+                utils.GetTokenExpireOn(), # add 2 day from now
+                clientUa,
+                clientIp,
+            ))
+            return token
+        else:
+            # throw a exception to indicate fail to login
+            raise DbException('Login authentication failed')
+
+    @SafeDatabaseOperation
+    def common_webLogin(self, username, password, clientUa, clientIp):
+        cursor = self._get_cursor()
+        LOGGER.debug(f'WebLogin Username: {username}')
+        LOGGER.debug(f'WebLogin Password: {password}')
+        passwordHash = utils.ComputePasswordHash(password)
+        LOGGER.debug(f'WebLogin Password Hash: {passwordHash}')
+
+        cursor.execute('SELECT [name] FROM user WHERE [name] = ? AND [password] = ?;', (username, passwordHash))
+
+        if len(cursor.fetchall()) != 0:
+            token = utils.GenerateToken(username)
+            cursor.execute('INSERT INTO token VALUES (?, ?, ?, ?, ?);', (
+                username,
+                token,
+                utils.GetTokenExpireOn(), # add 2 day from now
+                clientUa,
+                clientIp,
+            ))
+            return token
+        else:
+            # throw a exception to indicate fail to login
+            raise DbException('Login authentication failed')
+
+    @SafeDatabaseOperation
+    def common_logout(self, token):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+        cursor.execute('DELETE FROM token WHERE [token] = ?;', (token, ))
+        return True
+
+    @SafeDatabaseOperation
+    def common_tokenValid(self, token):
+        self.tokenOper_check_valid(token)
+        return True
+
+    # =============================== calendar
+    @SafeDatabaseOperation
+    def calendar_getFull(self, token, startDateTime, endDateTime):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT calendar.* FROM calendar INNER JOIN collection \
+                ON collection.uuid = calendar.belong_to \
+                WHERE (collection.user = ? AND calendar.loop_date_time_end >= ? AND calendar.loop_date_time_start - (calendar.event_date_time_end - calendar.event_date_time_start) <= ?);', 
+                (username, startDateTime, endDateTime))
+        return cursor.fetchall()
+
+    @SafeDatabaseOperation
+    def calendar_getList(self, token, startDateTime, endDateTime):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT calendar.uuid FROM calendar INNER JOIN collection \
+                ON collection.uuid = calendar.belong_to \
+                WHERE (collection.user = ? AND calendar.loop_date_time_end >= ? AND calendar.loop_date_time_start - (calendar.event_date_time_end - calendar.event_date_time_start) <= ?);', 
+                (username, startDateTime, endDateTime))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
+
+    @SafeDatabaseOperation
+    def calendar_getDetail(self, token, uuid):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+        cursor.execute('SELECT * FROM calendar WHERE [uuid] = ?;', (uuid, ))
+        return cursor.fetchone()
+
+    @SafeDatabaseOperation
+    def calendar_update(self, token, uuid, lastChange, **optArgs):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        # get prev data
+        cursor.execute('SELECT * FROM calendar WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        analyseData = list(cursor.fetchone())
+
+        # construct update data
+        lastupdate = utils.GenerateUUID()
+        sqlList = [
+            '[last_change] = ?',
+        ]
+        argumentsList = [
+            lastupdate,
+        ]
+
+        # analyse opt arg
+        reAnalyseLoop = False
+
+        cache = optArgs.get('belongTo', None)
+        if cache is not None:
+            sqlList.append('[belong_to] = ?')
+            argumentsList.append(cache)
+        cache = optArgs.get('title', None)
+        if cache is not None:
+            sqlList.append('[title] = ?')
+            argumentsList.append(cache)
+        cache = optArgs.get('description', None)
+        if cache is not None:
+            sqlList.append('[description] = ?')
+            argumentsList.append(cache)
+        cache = optArgs.get('eventDateTimeStart', None)
+        if cache is not None:
+            sqlList.append('[event_date_time_start] = ?')
+            argumentsList.append(cache)
+            reAnalyseLoop = True
+            analyseData[5] = cache
+        cache = optArgs.get('eventDateTimeEnd', None)
+        if cache is not None:
+            sqlList.append('[event_date_time_end] = ?')
+            argumentsList.append(cache)
+        cache = optArgs.get('loopRules', None)
+        if cache is not None:
+            sqlList.append('[loop_rules] = ?')
+            argumentsList.append(cache)
+            reAnalyseLoop = True
+            analyseData[8] = cache
+        cache = optArgs.get('timezoneOffset', None)
+        if cache is not None:
+            sqlList.append('[timezone_offset] = ?')
+            argumentsList.append(cache)
+            reAnalyseLoop = True
+            analyseData[7] = cache
+
+        if reAnalyseLoop:
+            # re-compute loop data and upload it into list
+            sqlList.append('[loop_date_time_start] = ?')
+            argumentsList.append(analyseData[5])
+            sqlList.append('[loop_date_time_end] = ?')
+            argumentsList.append(str(dt.ResolveLoopStr(
+                analyseData[8],
+                analyseData[5],
+                analyseData[7]
+            )))
+
+        # execute
+        argumentsList.append(uuid)
+        cursor.execute('UPDATE calendar SET {} WHERE [uuid] = ?;'.format(', '.join(sqlList)), 
+        tuple(argumentsList))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
+        return lastupdate
+
+    @SafeDatabaseOperation
+    def calendar_add(self, token, belongTo, title, description, eventDateTimeStart, eventDateTimeEnd, loopRules, timezoneOffset):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        newuuid = utils.GenerateUUID()
+        lastupdate = utils.GenerateUUID()
+
+        # analyse loopRules and output following 2 fileds.
+        loopDateTimeStart = eventDateTimeStart
+        loopDateTimeEnd = dt.ResolveLoopStr(loopRules, eventDateTimeStart, timezoneOffset)
+
+        cursor.execute('INSERT INTO calendar VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);', 
+        (newuuid,
+        belongTo,
+        title,
+        description,
+        lastupdate,
+        eventDateTimeStart,
+        eventDateTimeEnd,
+        timezoneOffset,
+        loopRules,
+        loopDateTimeStart,
+        loopDateTimeEnd))
+        return newuuid
+
+    @SafeDatabaseOperation
+    def calendar_delete(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+        cursor.execute('DELETE FROM calendar WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+        return True
+
+    # =============================== collection
+    @SafeDatabaseOperation
+    def collection_getFullOwn(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT [uuid], [name], [last_change] FROM collection WHERE [user] = ?;', (username, ))
+        return cursor.fetchall()
+
+    @SafeDatabaseOperation
+    def collection_getListOwn(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT [uuid] FROM collection WHERE [user] = ?;', (username, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
+
+    @SafeDatabaseOperation
+    def collection_getDetailOwn(self, token, uuid):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT [uuid], [name], [last_change] FROM collection WHERE [user] = ? AND [uuid] = ?;', (username, uuid))
+        return cursor.fetchone()
+
+    @SafeDatabaseOperation
+    def collection_addOwn(self, token, newname):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        newuuid = utils.GenerateUUID()
+        lastupdate = utils.GenerateUUID()
+        cursor.execute('INSERT INTO collection VALUES (?, ?, ?, ?);',
+        (newuuid, newname, username, lastupdate))
+        return newuuid
+
+    @SafeDatabaseOperation
+    def collection_updateOwn(self, token, uuid, newname, lastChange):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        lastupdate = utils.GenerateUUID()
+        cursor.execute('UPDATE collection SET [name] = ?, [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (
+            newname,
+            lastupdate,
+            uuid,
+            lastChange
+        ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
+        return lastupdate
+
+    @SafeDatabaseOperation
+    def collection_deleteOwn(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        cursor.execute('DELETE FROM collection WHERE [uuid] = ? AND [last_change] = ?;', (
+            uuid,
+            lastChange
+        ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+        return True
+
+    @SafeDatabaseOperation
+    def collection_getSharing(self, token, uuid):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+        cursor.execute('SELECT [target] FROM share WHERE [uuid] = ?;', (uuid, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
+
+    @SafeDatabaseOperation
+    def collection_deleteSharing(self, token, uuid, target, lastChange):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        lastupdate = utils.GenerateUUID()
+        cursor.execute('UPDATE collection SET [last_change] = ?, WHERE [uuid] = ? AND [last_change] = ?;', (lastupdate, uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+
+        cursor.execute('DELETE FROM share WHERE [uuid] = ? AND [target] = ?;', (uuid, target))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+
+        return lastupdate
+
+    @SafeDatabaseOperation
+    def collection_addSharing(self, token, uuid, target, lastChange):
+        cursor = self._get_cursor()
+        self.tokenOper_check_valid(token)
+
+        lastupdate = utils.GenerateUUID()
+        cursor.execute('UPDATE collection SET [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (lastupdate, uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+
+        cursor.execute('SELECT * FROM share WHERE [uuid] = ? AND [target] = ?;', (uuid, target))
+        if len(cursor.fetchall()) != 0:
+            raise DbException('Fail to insert duplicated item.')
+        cursor.execute('INSERT INTO share VALUES (?, ?);', (uuid, target))
+
+        return lastupdate
+
+    @SafeDatabaseOperation
+    def collection_getShared(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT collection.uuid, collection.name, collection.user \
+                FROM share INNER JOIN collection \
+                ON share.uuid = collection.uuid \
+                WHERE share.target = ?;', (username, ))
+        return cursor.fetchall()
+
+    # =============================== todo
+    @SafeDatabaseOperation
+    def todo_getFull(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT * FROM todo WHERE [belong_to] = ?;', (username, ))
+        return cursor.fetchall()
+
+    @SafeDatabaseOperation
+    def todo_getList(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT [uuid] FROM todo WHERE [belong_to] = ?;', (username, ))
+        return tuple(map(lambda x: x[0], cursor.fetchall()))
+
+    @SafeDatabaseOperation
+    def todo_getDetail(self, token, uuid):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('SELECT * FROM todo WHERE [belong_to] = ? AND [uuid] = ?;', (username, uuid))
+        return cursor.fetchone()
+
+    @SafeDatabaseOperation
+    def todo_add(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        newuuid = utils.GenerateUUID()
+        lastupdate = utils.GenerateUUID()
+        returnedData = (
+            newuuid,
+            username,
+            '',
+            lastupdate,
+        )
+        cursor.execute('INSERT INTO todo VALUES (?, ?, ?, ?);', returnedData)
+        return returnedData
+
+    @SafeDatabaseOperation
+    def todo_update(self, token, uuid, data, lastChange):
+        cursor = self._get_cursor()
+        # check valid token
+        self.tokenOper_check_valid(token)
+
+        # update
+        newLastChange = utils.GenerateUUID()
+        cursor.execute('UPDATE todo SET [data] = ?, [last_change] = ? WHERE [uuid] = ? AND [last_change] = ?;', (
+            data,
+            newLastChange,
+            uuid,
+            lastChange
+        ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
+        return newLastChange
+
+    @SafeDatabaseOperation
+    def todo_delete(self, token, uuid, lastChange):
+        cursor = self._get_cursor()
+        # check valid token
+        self.tokenOper_check_valid(token)
+
+        # delete
+        cursor.execute('DELETE FROM todo WHERE [uuid] = ? AND [last_change] = ?;', (uuid, lastChange))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+        return True
+
+
+    # =============================== admin
+    @SafeDatabaseOperation
+    def admin_get(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        if not self.tokenOper_is_admin(username):
+            raise DbException('Permission denied.')
+
+        cursor.execute('SELECT [name], [is_admin] FROM user;')
+        return tuple(map(lambda x: (x[0], x[1] == 1), cursor.fetchall()))
+
+    @SafeDatabaseOperation
+    def admin_add(self, token, newname):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        if not self.tokenOper_is_admin(username):
+            raise DbException('Permission denied.')
+
+        newpassword = utils.ComputePasswordHash(utils.GenerateUUID())
+        cursor.execute('INSERT INTO user VALUES (?, ?, ?, ?);', (
+            newname,
+            newpassword,
+            0,
+            utils.GenerateSalt()
+        ))
+        return (newname, False)
+
+    @SafeDatabaseOperation
+    def admin_update(self, token, _username, **optArgs):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        if not self.tokenOper_is_admin(username):
+            raise DbException('Permission denied.')
+
+        # construct data
+        sqlList = []
+        argumentsList = []
+
+        # analyse opt arg
+        cache = optArgs.get('password', None)
+        if cache is not None:
+            sqlList.append('[password] = ?')
+            argumentsList.append(utils.ComputePasswordHash(cache))
+        cache = optArgs.get('isAdmin', None)
+        if cache is not None:
+            sqlList.append('[is_admin] = ?')
+            argumentsList.append(1 if cache else 0)
+
+        # execute
+        argumentsList.append(_username)
+        cursor.execute('UPDATE user SET {} WHERE [name] = ?;'.format(', '.join(sqlList)), 
+        tuple(argumentsList))
+        LOGGER.debug(cache)
+        LOGGER.debug(tuple(argumentsList))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to update due to no matched rows or too much rows.')
+        return True
+
+    @SafeDatabaseOperation
+    def admin_delete(self, token, username):
+        cursor = self._get_cursor()
+        _username = self.tokenOper_get_username(token)
+        if not self.tokenOper_is_admin(_username):
+            raise DbException('Permission denied.')
+
+        # delete
+        cursor.execute('DELETE FROM user WHERE [name] = ?;', (username, ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+        return True
+
+    # =============================== profile
+    @SafeDatabaseOperation
+    def profile_isAdmin(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        return self.tokenOper_is_admin(username)
+
+    @SafeDatabaseOperation
+    def profile_changePassword(self, token, newpassword):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+        cursor.execute('UPDATE user SET [password] = ? WHERE [name] = ?;', (
+            utils.ComputePasswordHash(newpassword),
+            username
+        ))
+        return True
+
+    @SafeDatabaseOperation
+    def profile_getToken(self, token):
+        cursor = self._get_cursor()
+        username = self.tokenOper_get_username(token)
+
+        cursor.execute('SELECT * FROM token WHERE [user] = ?;', (
+            username,
+        ))
+        return cursor.fetchall()
+
+    @SafeDatabaseOperation
+    def profile_deleteToken(self, token, deleteToken):
+        cursor = self._get_cursor()
+        _username = self.tokenOper_get_username(token)
+
+        # delete
+        cursor.execute('DELETE FROM token WHERE [user] = ? AND [token] = ?;', (
+            _username, 
+            deleteToken
+        ))
+        if cursor.rowcount != 1:
+            raise DbException('Fail to delete due to no matched rows or too much rows.')
+        return True
+
--- a/backend-legacy/dt.py
+++ b/backend-legacy/dt.py
@@ -0,0 +1,289 @@
+import datetime
+import re
+import logging
+import typing
+from functools import reduce
+import utils
+
+MonthDayCount = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
+
+MIN_DATETIME = datetime.datetime(1950, 1, 1, 0, 0, 0, 0, tzinfo=datetime.timezone.utc)
+MAX_DATETIME = datetime.datetime(2200, 1, 1, 0, 0, 0, 0, tzinfo=datetime.timezone.utc)
+MIN_TIMESTAMP = int(MIN_DATETIME.timestamp() / 60)
+MAX_TIMESTAMP = int(MAX_DATETIME.timestamp() / 60)
+DAY1_SPAN = 60 * 24
+DAY7_SPAN = 7 * DAY1_SPAN
+
+LoopHandle = typing.Callable[[re.Match, int, int, int], int]
+
+def ResolveLoopStr(strl: str, starttime: int, tzoffset: int) -> int:
+    # check no loop
+    if strl == '':
+        return starttime
+    
+    # try compute from loopStop
+    (loopRules, loopStopRules) = strl.split('-')
+    cache = precompiledLoopStopRules['infinity'].search(loopStopRules)
+    if cache is not None:
+        return MAX_TIMESTAMP
+    cache = precompiledLoopStopRules['datetime'].search(loopStopRules)
+    if cache is not None:
+        return int(cache.group(1)) # group 1 is datetime
+    cache = precompiledLoopStopRules['times'].search(loopStopRules)
+    if cache is not None:
+        loopTimes = int(cache.group(1))   # for follwing calc
+    else:
+        raise Exception('Invalid loopStopRules')    # invalid rules
+
+    for rules in precompiledLoopRules:
+        cache = rules[0].search(loopRules)
+        if cache is not None:
+             return rules[1](cache, starttime, loopTimes, tzoffset)
+    else:
+        raise Exception('Invalid loopRules')
+
+
+def LoopHandle_Year(searchResult: re.Match, starttime: int, times: int, tzoffset: int) -> int:
+    clientDate = datetime.datetime.fromtimestamp(starttime * 60, UTCTimezone(tzoffset))
+    isStrict = searchResult.group(1) == 'S'
+    yearSpan = int(searchResult.group(2))
+
+    times -= 1
+    newYear = clientYear = clientDate.year
+    newMonth = clientMonth = clientDate.month
+    newDay = clientDay = clientDate.day
+    if clientMonth == 2 and clientDay == 29:
+        if isStrict:
+            realSpan = utils.LCM(yearSpan, 4)
+            logging.debug(realSpan)
+            valCache = starttime
+            while valCache < MAX_TIMESTAMP and times > 0:
+                newYear += realSpan
+                if not IsLeapYear(newYear):
+                    continue
+                valCache = starttime + DAY1_SPAN * (DaysCount(newYear, newMonth, newDay) - DaysCount(clientYear, clientMonth, clientDay))
+                times -= 1
+        else:
+            newYear += times * yearSpan
+            if not IsLeapYear(newYear):
+                newDay = 28     # migrate to 28
+    else:
+        # if times == 1, no extra datetime need to be added
+        newYear += times * yearSpan
+
+    val = starttime + DAY1_SPAN * (DaysCount(newYear, newMonth, newDay) - DaysCount(clientYear, clientMonth, clientDay))
+    return val if val < MAX_TIMESTAMP else MAX_TIMESTAMP
+
+def LoopHandle_Month(searchResult: re.Match, starttime: int, times: int, tzoffset: int) -> int:
+    isStrict = searchResult.group(1) == 'S'
+    loopType = searchResult.group(2)
+    monthSpan = int(searchResult.group(3))
+
+    # we should get original data in each method
+    times -= 1
+    clientDate = datetime.datetime.fromtimestamp(starttime * 60, UTCTimezone(tzoffset))
+    newYear = clientYear = clientDate.year
+    newMonth = clientMonth = clientDate.month
+    newDay = clientDay = clientDate.day
+    # data struct
+    # dayStatistics =
+    # (dayForwards || dayBackwards || weeksForward, dayOfWeek || weeksBackwards, dayOfWeek)
+    # ( A || B || C || D )
+    dayStatistics = GetDayInMonth(clientYear, clientMonth, clientDay)
+
+    if isStrict:
+        if loopType == 'A':
+            while times > 0:
+                newMonth += monthSpan
+                if newMonth > 12:
+                    newYear += int((newMonth - 1) / 12)
+                    newMonth = ((newMonth - 1) % 12) + 1
+                if newYear > MAX_DATETIME.year:
+                    break
+                maxDays = MonthDayCount[newMonth - 1] + (1 if newMonth == 2 and IsLeapYear(newYear) else 0)
+                if dayStatistics[0] <= maxDays:
+                    times -= 1
+        elif loopType == 'B':
+            while times > 0:
+                newMonth += monthSpan
+                if newMonth > 12:
+                    newYear += int((newMonth - 1) / 12)
+                    newMonth = ((newMonth - 1) % 12) + 1
+                if newYear > MAX_DATETIME.year:
+                    break
+                maxDays = MonthDayCount[newMonth - 1] + (1 if newMonth == 2 and IsLeapYear(newYear) else 0)
+                if dayStatistics[1] <= maxDays:
+                    times -= 1
+        elif loopType == 'C':
+            while times > 0:
+                newMonth += monthSpan
+                if newMonth > 12:
+                    newYear += int((newMonth - 1) / 12)
+                    newMonth = ((newMonth - 1) % 12) + 1
+                if newYear > MAX_DATETIME.year:
+                    break
+                monthStatistics = GetMonthWeekStatistics(newYear, newMonth)
+                if dayStatistics[2] <= monthStatistics[dayStatistics[3]]:
+                    times -= 1
+        elif loopType == 'D':
+            while times > 0:
+                newMonth += monthSpan
+                if newMonth > 12:
+                    newYear += int((newMonth - 1) / 12)
+                    newMonth = ((newMonth - 1) % 12) + 1
+                if newYear > MAX_DATETIME.year:
+                    break
+                monthStatistics = GetMonthWeekStatistics(newYear, newMonth)
+                if dayStatistics[4] <= monthStatistics[dayStatistics[5]]:
+                    times -= 1
+    else:
+        newMonth += times * monthSpan
+        newYear += int((newMonth - 1) / 12)
+        newMonth = ((newMonth - 1) % 12) + 1
+        
+    # all method need calc newDay and it should be the last day of current selected month
+    # so calc it in there
+    newDay = MonthDayCount[newMonth - 1] + (1 if newMonth == 2 and IsLeapYear(newYear) else 0)
+    val = starttime + DAY1_SPAN * (DaysCount(newYear, newMonth, newDay) - DaysCount(clientYear, clientMonth, clientDay))
+    return val if val < MAX_TIMESTAMP else MAX_TIMESTAMP
+
+def LoopHandle_Week(searchResult: re.Match, starttime: int, times: int, tzoffset: int) -> int:
+    weekOccupied = tuple(map(lambda x: x == 'T', searchResult.group(1)))
+    weekEventCount = reduce(lambda x, y: x + (1 if y else 0), weekOccupied, 0)
+    if weekEventCount == 0:
+        raise Exception('Invalid week format')
+
+    weekSpan = int(searchResult.group(2))
+    nowDayOfWeek = datetime.datetime.fromtimestamp(starttime * 60, UTCTimezone(tzoffset)).weekday()
+    if not weekOccupied[nowDayOfWeek]:
+        times-=1    # if first event is not suit for week loop rules, minus one more event to suit it.
+    fullWeek = int(times / weekEventCount)
+    remainEvent = times % weekEventCount
+    
+    val = starttime + DAY7_SPAN * fullWeek * weekSpan
+    if val > MAX_TIMESTAMP:
+        return MAX_TIMESTAMP    # return now, to reduce calc usage
+
+    while remainEvent != 0:
+        val += DAY1_SPAN
+        if weekOccupied[nowDayOfWeek % 7]:
+            remainEvent -= 1
+        nowDayOfWeek += 1
+
+    val -= 1
+    return val if val < MAX_TIMESTAMP else MAX_TIMESTAMP
+
+def LoopHandle_Day(searchResult: re.Match, starttime: int, times: int, tzoffset: int) -> int:
+    val = starttime + DAY1_SPAN * times * int(searchResult.group(1))
+    val -= 1
+    return val if val < MAX_TIMESTAMP else MAX_TIMESTAMP
+
+precompiledLoopRules: tuple[tuple[re.Pattern, LoopHandle], ...] = (
+    (re.compile(r'^Y([SR]{1})([1-9]\d*)$'), LoopHandle_Year),
+    (re.compile(r'^M([SR]{1})([ABCD]{1})([1-9]\d*)$'), LoopHandle_Month),
+    (re.compile(r'^W([TF]{7})([1-9]\d*)$'), LoopHandle_Week),
+    (re.compile(r'^D([1-9]\d*)$'), LoopHandle_Day)
+)
+
+precompiledLoopStopRules: dict[str, re.Pattern] = {
+    'infinity': re.compile(r'^F$'),
+    'datetime': re.compile(r'^D([1-9]\d*|0)$'),
+    'times': re.compile(r'^T([1-9]\d*)$')
+}
+
+def LeapYearCountEx(endYear: int, includeThis: bool = False, baseYear: int = 1, includeBase: bool = True):
+    if not includeThis:
+        endYear -= 1
+    if includeBase:
+        baseYear -= 1
+
+    endly = int(endYear / 4)
+    endly -= int(endYear / 100)
+    endly += int(endYear / 400)
+
+    basely = int(baseYear / 4)
+    basely -= int(baseYear / 100)
+    basely += int(baseYear / 400)
+
+    return (endly - basely)
+
+def LeapYearCount(year: int):
+    return LeapYearCountEx(year, False, 1, True)
+
+def IsLeapYear(year: int):
+    isLeap = False
+    if year % 4 == 0:
+        isLeap = True
+    if year % 100 == 0:
+        isLeap = False
+    if year % 400 == 0:
+        isLeap = True
+    return isLeap
+
+def DaysCount(year: int, month: int, day: int):
+    ly = LeapYearCountEx(year, False, 1, True)
+    days = 365 * (year - 1)
+    days += ly
+
+    for index in range(1, month, 1):
+        days += MonthDayCount[index - 1]
+
+    if (month > 2) and IsLeapYear(year):
+        days += 1
+
+    days += day - 1
+    return days
+
+def DayOfWeek(year: int, month: int, day: int):
+    # as we know, 1/1/1900 is Monday.
+    # via this method, we can got 1/1/1 is Monday
+    # compute day span
+    days=DaysCount(year, month, day)
+
+    # return day of week (from 0 - 6, corresponding with python)
+    return days % 7
+
+def GetDayInMonth(year: int, month: int, day: int):
+    days = MonthDayCount[month - 1] + (1 if (month == 2 and IsLeapYear(year)) else 0)
+    firstDayOfWeek = DayOfWeek(year, month, 1)
+    dayOfWeek = (firstDayOfWeek + day - 1) % 7
+
+    dayForwards = day
+    dayBackwards = days - day + 1
+
+    weeksForward = int((dayForwards - 1) / 7) + 1
+    weeksBackwards = int((dayBackwards - 1) / 7) + 1
+
+    return (dayForwards, dayBackwards, weeksForward, dayOfWeek, weeksBackwards, dayOfWeek)
+
+def GetMonthWeekStatistics(year: int, month: int):
+    days = MonthDayCount[month - 1] + (1 if (month == 2 and IsLeapYear(year)) else 0)
+    firstDayOfWeek = DayOfWeek(year, month, 1)
+    lastDayOfWeek = (firstDayOfWeek + days - 1) % 7
+ 
+    result = [4, 4, 4, 4, 4, 4, 4]
+    remain = days % 7
+    week = firstDayOfWeek
+    while remain > 0:
+        result[week % 7] += 1
+        week += 1
+        remain -= 1
+
+    return tuple(result)
+
+class UTCTimezone(datetime.tzinfo):
+
+    __offset: int
+
+    def __init__(self, offset: int = 0):
+        self.__offset = offset
+
+    def utcoffset(self, dt):
+        return datetime.timedelta(minutes=self.__offset)
+
+    def tzname(self, dt):
+        return 'UTC {}'.format(self.__offset)
+
+    def dst(self, dt):
+        return datetime.timedelta(0)
+    
--- a/backend-legacy/logger.py
+++ b/backend-legacy/logger.py
@@ -0,0 +1,42 @@
+import logging
+import enum
+
+
+def _build_logger() -> tuple[logging.Logger, logging.Handler]:
+    # Create a new logger which is independent with Flask
+    logger = logging.getLogger("my_console_logger")
+    # Avoid message was propagated to root logger or captured by Flask logger.
+    logger.propagate = False
+    # Set initial level.
+    logger.setLevel(logging.INFO)
+
+    # Create StreamHandler to output into stderr.
+    console_handler = logging.StreamHandler()
+    console_handler.setLevel(logging.DEBUG)
+    # Set format for it.
+    formatter = logging.Formatter("[%(levelname)s] %(message)s")
+    console_handler.setFormatter(formatter)
+    # Add handler
+    logger.addHandler(console_handler)
+
+    return (logger, console_handler)
+
+
+(LOGGER, CONSOLE_HANDLER) = _build_logger()
+
+
+class LoggerLevel(enum.IntEnum):
+    DEBUG = enum.auto()
+    INFO = enum.auto()
+
+
+def set_level(level: LoggerLevel) -> None:
+    logging_level: int = logging.INFO
+    match level:
+        case LoggerLevel.DEBUG:
+            logging_level = logging.DEBUG
+        case LoggerLevel.INFO:
+            logging_level = logging.INFO
+
+    LOGGER.setLevel(logging_level)
+    CONSOLE_HANDLER.setLevel(logging_level)
--- a/backend-legacy/pyproject.toml
+++ b/backend-legacy/pyproject.toml
@@ -0,0 +1,14 @@
+[project]
+name = "coleaf-backend"
+version = "1.1.0"
+description = "The backend of coconut-leaf."
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "flask==2.2.3",
+]
+[tool.uv]
+constraint-dependencies = [
+    "Werkzeug==2.2.2",
+    "MarkupSafe==2.1.5"
+]
--- a/backend-legacy/server.py
+++ b/backend-legacy/server.py
@@ -0,0 +1,513 @@
+from flask import Flask
+from flask import request
+from dataclasses import dataclass
+from typing import Any, Callable, ParamSpec, TypeVar, Generic
+
+import config
+import database
+import utils
+from logger import LOGGER
+from database import ResponseBody
+
+app = Flask(__name__)
+calendar_db = database.CalendarDatabase()
+
+# region: API Route
+
+# region: Common
+
+
+@app.route("/common/salt", methods=["POST"])
+def api_common_saltHandle():
+    return SmartDbCaller(
+        calendar_db.common_salt, (FormField("username", str, False),), None
+    )
+
+
+@app.route("/common/login", methods=["POST"])
+def api_common_loginHandle():
+    clientInfo = FetchClientNetworkInfo()
+
+    return SmartDbCaller(
+        calendar_db.common_login,
+        (
+            FormField("username", str, False),
+            FormField("password", str, False),
+            FormField("clientUa", str, False),
+            FormField("clientIp", str, False),
+        ),
+        {"clientUa": clientInfo.user_agent, "clientIp": clientInfo.ip_addr},
+    )
+
+
+@app.route("/common/webLogin", methods=["POST"])
+def api_common_webLoginHandle():
+    clientInfo = FetchClientNetworkInfo()
+
+    return SmartDbCaller(
+        calendar_db.common_webLogin,
+        (
+            FormField("username", str, False),
+            FormField("password", str, False),
+            FormField("clientUa", str, False),
+            FormField("clientIp", str, False),
+        ),
+        {"clientUa": clientInfo.user_agent, "clientIp": clientInfo.ip_addr},
+    )
+
+
+@app.route("/common/logout", methods=["POST"])
+def api_common_logoutHandle():
+    return SmartDbCaller(
+        calendar_db.common_logout, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/common/tokenValid", methods=["POST"])
+def api_common_tokenValidHandle():
+    return SmartDbCaller(
+        calendar_db.common_tokenValid, (FormField("token", str, False),), None
+    )
+
+
+# endregion
+
+# region: Calendar
+
+
+@app.route("/calendar/getFull", methods=["POST"])
+def api_calendar_getFullHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_getFull,
+        (
+            FormField("token", str, False),
+            FormField("startDateTime", int, False),
+            FormField("endDateTime", int, False),
+        ),
+        None,
+    )
+
+
+@app.route("/calendar/getList", methods=["POST"])
+def api_calendar_getListHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_getList,
+        (
+            FormField("token", str, False),
+            FormField("startDateTime", int, False),
+            FormField("endDateTime", int, False),
+        ),
+        None,
+    )
+
+
+@app.route("/calendar/getDetail", methods=["POST"])
+def api_calendar_getDetailHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_getDetail,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
+
+
+@app.route("/calendar/update", methods=["POST"])
+def api_calendar_updateHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_update,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("belongTo", str, True),
+            FormField("title", str, True),
+            FormField("description", str, True),
+            FormField("eventDateTimeStart", int, True),
+            FormField("eventDateTimeEnd", int, True),
+            FormField("loopRules", str, True),
+            FormField("timezoneOffset", int, True),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/calendar/add", methods=["POST"])
+def api_calendar_addHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_add,
+        (
+            FormField("token", str, False),
+            FormField("belongTo", str, False),
+            FormField("title", str, False),
+            FormField("description", str, False),
+            FormField("eventDateTimeStart", int, False),
+            FormField("eventDateTimeEnd", int, False),
+            FormField("loopRules", str, False),
+            FormField("timezoneOffset", int, False),
+        ),
+        None,
+    )
+
+
+@app.route("/calendar/delete", methods=["POST"])
+def api_calendar_deleteHandle():
+    return SmartDbCaller(
+        calendar_db.calendar_delete,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+# endregion
+
+# region: Collection
+
+
+@app.route("/collection/getFullOwn", methods=["POST"])
+def api_collection_getFullOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_getFullOwn, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/collection/getListOwn", methods=["POST"])
+def api_collection_getListOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_getListOwn, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/collection/getDetailOwn", methods=["POST"])
+def api_collection_getDetailOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_getDetailOwn,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
+
+
+@app.route("/collection/addOwn", methods=["POST"])
+def api_collection_addOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_addOwn,
+        (FormField("token", str, False), FormField("name", str, False)),
+        None,
+    )
+
+
+@app.route("/collection/updateOwn", methods=["POST"])
+def api_collection_updateOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_updateOwn,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("name", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/collection/deleteOwn", methods=["POST"])
+def api_collection_deleteOwnHandle():
+    return SmartDbCaller(
+        calendar_db.collection_deleteOwn,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/collection/getSharing", methods=["POST"])
+def api_collection_getSharingHandle():
+    return SmartDbCaller(
+        calendar_db.collection_getSharing,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
+
+
+@app.route("/collection/deleteSharing", methods=["POST"])
+def api_collection_deleteSharingHandle():
+    return SmartDbCaller(
+        calendar_db.collection_deleteSharing,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("target", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/collection/addSharing", methods=["POST"])
+def api_collection_addSharingHandle():
+    return SmartDbCaller(
+        calendar_db.collection_addSharing,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("target", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/collection/getShared", methods=["POST"])
+def api_collection_getSharedHandle():
+    return SmartDbCaller(
+        calendar_db.collection_getShared, (FormField("token", str, False),), None
+    )
+
+
+# endregion
+
+# region: Todo
+
+
+@app.route("/todo/getFull", methods=["POST"])
+def api_todo_getFullHandle():
+    return SmartDbCaller(
+        calendar_db.todo_getFull, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/todo/getList", methods=["POST"])
+def api_todo_getListHandle():
+    return SmartDbCaller(
+        calendar_db.todo_getList, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/todo/getDetail", methods=["POST"])
+def api_todo_getDetailHandle():
+    return SmartDbCaller(
+        calendar_db.todo_getDetail,
+        (FormField("token", str, False), FormField("uuid", str, False)),
+        None,
+    )
+
+
+@app.route("/todo/add", methods=["POST"])
+def api_todo_addHandle():
+    return SmartDbCaller(calendar_db.todo_add, (FormField("token", str, False),), None)
+
+
+@app.route("/todo/update", methods=["POST"])
+def api_todo_updateHandle():
+    return SmartDbCaller(
+        calendar_db.todo_update,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("data", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+@app.route("/todo/delete", methods=["POST"])
+def api_todo_deleteHandle():
+    return SmartDbCaller(
+        calendar_db.todo_delete,
+        (
+            FormField("token", str, False),
+            FormField("uuid", str, False),
+            FormField("lastChange", str, False),
+        ),
+        None,
+    )
+
+
+# endregion
+
+# region: Admin
+
+
+@app.route("/admin/get", methods=["POST"])
+def api_admin_getHandle():
+    return SmartDbCaller(calendar_db.admin_get, (FormField("token", str, False),), None)
+
+
+@app.route("/admin/add", methods=["POST"])
+def api_admin_addHandle():
+    return SmartDbCaller(
+        calendar_db.admin_add,
+        (FormField("token", str, False), FormField("username", str, False)),
+        None,
+    )
+
+
+@app.route("/admin/update", methods=["POST"])
+def api_admin_updateHandle():
+    return SmartDbCaller(
+        calendar_db.admin_update,
+        (
+            FormField("token", str, False),
+            FormField("username", str, False),
+            FormField("password", str, True),
+            FormField("isAdmin", utils.Str2Bool, True),
+        ),
+        None,
+    )
+
+
+@app.route("/admin/delete", methods=["POST"])
+def api_admin_deleteHandle():
+    return SmartDbCaller(
+        calendar_db.admin_delete,
+        (FormField("token", str, False), FormField("username", str, False)),
+        None,
+    )
+
+
+# endregion
+
+# region: Profile
+
+
+@app.route("/profile/isAdmin", methods=["POST"])
+def api_profile_isAdminHandle():
+    return SmartDbCaller(
+        calendar_db.profile_isAdmin, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/profile/changePassword", methods=["POST"])
+def api_profile_changePasswordHandle():
+    return SmartDbCaller(
+        calendar_db.profile_changePassword,
+        (FormField("token", str, False), FormField("password", str, False)),
+        None,
+    )
+
+
+@app.route("/profile/getToken", methods=["POST"])
+def api_profile_getTokenHandle():
+    return SmartDbCaller(
+        calendar_db.profile_getToken, (FormField("token", str, False),), None
+    )
+
+
+@app.route("/profile/deleteToken", methods=["POST"])
+def api_profile_deleteTokenHandle():
+    return SmartDbCaller(
+        calendar_db.profile_deleteToken,
+        (FormField("token", str, False), FormField("deleteToken", str, False)),
+        None,
+    )
+
+
+# endregion
+
+# endregion
+
+# region: Utilities
+
+
+@dataclass(frozen=True)
+class ClientNetworkInfo:
+    user_agent: str
+    """The user agent of client."""
+    ip_addr: str
+    """The IP address of client."""
+
+
+def FetchClientNetworkInfo() -> ClientNetworkInfo:
+    clientUa = request.user_agent.string
+    forwardIpList = request.headers.getlist("X-Forwarded-For")
+    if forwardIpList:
+        clientIp = forwardIpList[0]
+    else:
+        directIp = request.remote_addr
+        if directIp is not None:
+            clientIp = directIp
+        else:
+            clientIp = "0.0.0.0"
+
+    return ClientNetworkInfo(clientUa, clientIp)
+
+
+@dataclass(frozen=True)
+class FormField:
+    name: str
+    """The name of form field."""
+    ty: Callable[[str], Any]
+    """The type of form field."""
+    is_optional: bool
+    """True if this form field is optional, otherwise false."""
+
+
+def SmartDbCaller(
+    db_method: Callable[..., ResponseBody[Any]],
+    fields: tuple[FormField, ...],
+    padding_form: dict[str, str] | None,
+) -> dict[str, Any]:
+    opt_param_counter = 0
+    lost_required: bool = False
+    param_list: list[Any] = []
+    opt_param_dict: dict[str, Any] = {}
+
+    # fetch user passed form
+    user_form: dict[str, str] = request.form.to_dict()
+    LOGGER.debug(f"User Form: {user_form}")
+    # overwrite user form by our padding form
+    if padding_form is not None:
+        user_form.update(padding_form)
+    LOGGER.debug(f"Padded User Form: {user_form}")
+
+    # check fields one by one
+    for field in fields:
+        value = user_form.get(field.name, None)
+        if value is not None:
+            value = field.ty(value)
+
+        if field.is_optional:
+            # optional param
+            if value is not None:
+                opt_param_dict[field.name] = value
+            opt_param_counter += 1
+        else:
+            # required param
+            if value is None:
+                lost_required = True
+            else:
+                param_list.append(value)
+
+    # Only execute database function if there is no lost required fields.
+    # And fulfill one of following requirements:
+    # 1. There are all required fields (optional parameter count is zero).
+    # 1. Or, there is some optional parameter.
+    LOGGER.debug(f"Has Lost Required Parameter: {lost_required}")
+    LOGGER.debug(f"All Optional Parameter Count: {opt_param_counter}")
+    LOGGER.debug(f"Available Optional Parameter Count: {len(opt_param_dict)}")
+    result: ResponseBody[Any]
+    if lost_required == False and (opt_param_counter == 0 or len(opt_param_dict) != 0):
+        result = db_method(*param_list, **opt_param_dict)
+    else:
+        result = ResponseBody(False, "Invalid parameter", None)
+
+    return ConstructResponseBody(result)
+
+
+def ConstructResponseBody(body: ResponseBody[Any]) -> dict[str, Any]:
+    return {"success": body.success, "error": body.error, "data": body.data}
+
+
+# endregion
+
+
+def run():
+    calendar_db.open()
+    app.run(port=config.get_config().web.port)
+    calendar_db.close()
--- a/backend-legacy/sql/mysql.sql
+++ b/backend-legacy/sql/mysql.sql
--- a/backend-legacy/sql/sqlite.sql
+++ b/backend-legacy/sql/sqlite.sql
@@ -0,0 +1,67 @@
+CREATE TABLE user(
+    [name] TEXT NOT NULL,
+    [password] TEXT NOT NULL,
+    [is_admin] TINYINT NOT NULL CHECK(is_admin = 1 OR is_admin = 0),
+    [salt] INTEGER NOT NULL,
+
+    PRIMARY KEY (name)
+);
+
+CREATE TABLE token(
+    [user] TEXT NOT NULL,
+    [token] TEXT UNIQUE NOT NULL,
+    [token_expire_on] BIGINT NOT NULL,
+    [ua] TEXT NOT NULL,
+    [ip] TEXT NOT NULL,
+
+    FOREIGN KEY (user) REFERENCES user(name) ON DELETE CASCADE
+);
+
+CREATE TABLE collection(
+    [uuid] TEXT NOT NULL,
+    [name] TEXT NOT NULL,
+    [user] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
+
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (user) REFERENCES user(name) ON DELETE CASCADE
+);
+
+CREATE TABLE share(
+    [uuid] TEXT NOT NULL,
+    [target] TEXT NOT NULL,
+
+    FOREIGN KEY (uuid) REFERENCES collection(uuid) ON DELETE CASCADE
+    FOREIGN KEY (target) REFERENCES user(name) ON DELETE CASCADE
+);
+
+CREATE TABLE calendar(
+    [uuid] TEXT NOT NULL,
+    [belong_to] TEXT NOT NULL,
+
+    [title] TEXT NOT NULL,
+    [description] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
+
+    [event_date_time_start] BIGINT NOT NULL,
+    [event_date_time_end] BIGINT NOT NULL,
+    [timezone_offset] INT NOT NULL,
+    
+    [loop_rules] TEXT NOT NULL,
+    [loop_date_time_start] BIGINT NOT NULL,
+    [loop_date_time_end] BIGINT NOT NULL,
+
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (belong_to) REFERENCES collection(uuid) ON DELETE CASCADE
+);
+
+CREATE TABLE todo(
+    [uuid] TEXT NOT NULL,
+    [belong_to] TEXT NOT NULL,
+
+    [data] TEXT NOT NULL,
+    [last_change] TEXT NOT NULL,
+
+    PRIMARY KEY (uuid),
+    FOREIGN KEY (belong_to) REFERENCES user(name) ON DELETE CASCADE
+);
--- a/backend-legacy/utils.py
+++ b/backend-legacy/utils.py
@@ -0,0 +1,64 @@
+import hashlib
+import random
+import uuid
+import time
+import math
+import re
+
+USERNAME_PATTERN: re.Pattern = re.compile("^[0-9A-Za-z]+$")
+PASSWORD_PATTERN: re.Pattern = re.compile("^[!-~]+$")
+
+
+def IsValidUsername(strl: str) -> bool:
+    return USERNAME_PATTERN.match(strl) is not None
+
+
+def IsValidPassword(strl: str) -> bool:
+    return PASSWORD_PATTERN.match(strl) is not None
+
+
+def ComputePasswordHash(password: str) -> str:
+    s = hashlib.sha256()
+    s.update(password.encode("utf-8"))
+    return s.hexdigest()
+
+
+def GenerateUUID() -> str:
+    return str(uuid.uuid1())
+
+
+def GenerateToken(username: str) -> str:
+    s = hashlib.sha256()
+    s.update(username.encode("utf-8"))
+    s.update(GenerateUUID().encode("utf-8"))
+    return s.hexdigest()
+
+
+def GenerateSalt() -> int:
+    return random.randint(0, 6172748)
+
+
+def ComputePasswordHashWithSalt(passwordHashed: str, salt: int) -> str:
+    s = hashlib.sha256()
+    s.update((passwordHashed + str(salt)).encode("utf-8"))
+    return s.hexdigest()
+
+
+def GetCurrentTimestamp() -> int:
+    return int(time.time())
+
+
+def GetTokenExpireOn() -> int:
+    return GetCurrentTimestamp() + 60 * 60 * 24 * 2  # add 2 day from now
+
+
+def Str2Bool(strl: str) -> bool:
+    return strl.lower() == "true"
+
+
+def GCD(a: int, b: int) -> int:
+    return math.gcd(a, b)
+
+
+def LCM(a: int, b: int) -> int:
+    return (a * b) // GCD(a, b)
--- a/backend-legacy/uv.lock
+++ b/backend-legacy/uv.lock
@@ -0,0 +1,117 @@
+version = 1
+revision = 2
+requires-python = ">=3.11"
+
+[manifest]
+constraints = [
+    { name = "markupsafe", specifier = "==2.1.5" },
+    { name = "werkzeug", specifier = "==2.2.2" },
+]
+
+[[package]]
+name = "click"
+version = "8.3.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/bb/63/f9e1ea081ce35720d8b92acde70daaedace594dc93b693c869e0d5910718/click-8.3.3.tar.gz", hash = "sha256:398329ad4837b2ff7cbe1dd166a4c0f8900c3ca3a218de04466f38f6497f18a2", size = 328061, upload-time = "2026-04-22T15:11:27.506Z" }
+wheels = [
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+]
+
+[[package]]
+name = "coleaf-backend"
+version = "1.1.0"
+source = { virtual = "." }
+dependencies = [
+    { name = "flask" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "flask", specifier = "==2.2.3" }]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+source = { registry = "https://pypi.org/simple" }
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+]
+
+[[package]]
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+source = { registry = "https://pypi.org/simple" }
+dependencies = [
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+]
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