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class User

Maturity: 54

A user management class that handles authentication, authorization, user profiles, preferences, file management, and logging for a Panel-based web application with Neo4j backend.

File:
/tf/active/vicechatdev/userclass.py
Lines:
23 - 396
Complexity:
complex

Purpose

The User class manages user authentication (both OAuth and local login), role-based access control (admin, manager, pathologist, read-only), user preferences, file operations, activity logging, and task completion tracking. It integrates with Neo4j graph database for user data storage and Panel framework for UI components. The class handles the complete user lifecycle from login to session management, including user statistics, preferences, file downloads, and audit logging.

Source Code

class User(param.Parameterized):
    """
    User class to keep track of current user, roles, and information.
    """
    
    login_state=param.String(default="undefined",doc="Login action to undertake")
    
    def __init__(self):
        
        super().__init__()
        self.init_connections()
        self.user = 'SYSTEM'
        #self.name = self.user
        self.number = ''
        self.mail = ''
        self.customer = ''
        self.usergroup = ''
        self.UID = ''
        self.prefs={}
        self.is_admin=False
        self.is_manager=False
        self.is_pathologist=False
        self.is_ro=False
        self.log = logging.getLogger(self.__class__.__name__)
        self.log.setLevel(logging.DEBUG)
        self.log.addHandler(self.file_handler)
        self.log.addHandler(self.stream_handler)
        self.modal_content=pn.Column(align = "center")
        print("pn state user is", pn.state.user)
        o365_user=pn.state.user
        if o365_user is not None:
            if '@' in o365_user:
                g_text=f"match (u:User) WHERE u.Mail =~ '(?i){o365_user}' return u"
            else:
                g_text=f"match (u:User) WHERE u.Name =~ '(?i){o365_user}' return u"
            selected_user=self.graph.run(g_text).evaluate()
            if not selected_user:
                self.login_state="local"
            else:
                self.fill_user(selected_user)
                self.login_state="active"
        else:
            self.login_state="local"
        
        self.user_stats=pn.Column(align = "center", sizing_mode = "stretch_width",max_width=1140, max_height=600,css_classes=['box1'])
        self.user_prefs=pn.Column(align = "center", sizing_mode = "stretch_width",max_width=1140,  max_height=600,css_classes=['box1'])
        self.user_files=pn.Column(align = "center", sizing_mode = "stretch_width",max_width=1140,  max_height=600,css_classes=['box1'])
        self.user_logs=pn.Column(align = "center", sizing_mode = "stretch_width",max_width=1140,  max_height=600,css_classes=['box1'])
        return
    
    def create_log(self):
        """Create log object"""
        print("creating log")
        logger = self.get_existing_logger(self.user)
        if logger:
            self.log = logger
        else:
            self.log = logging.getLogger(self.user)
            self.log.setLevel(logging.DEBUG)
            self.log.addHandler(self.file_handler)
    
    
    def get_existing_logger(self, loggername):
        """
        Checks if a logger already exists for the current user
        
        Parameters
        ----------
        loggername : str
            The name of the logger
        
        Returns
        -------
        Either the matched logger, or Bool False if no matching logger was found
        """
        for name in logging.root.manager.loggerDict:
            if name == loggername:
                return logging.getLogger(loggername)
        return False
        
    
    def init_connections(self):
        
        self.graph=Graph(config.DB_ADDR,auth=config.DB_AUTH,name=config.DB_NAME)
        return
    
    @property
    def formatter(self):
        """
        The logging formatter - defines the information passed to the log file and the console.
        """
        return logging.Formatter('[%(asctime)s: %(name)s.%(funcName)s:%(levelname)s:]:\t%(message)s')
    
    @property
    def file_handler(self):
        """
        The logging file handler. This defines the file we write to, the level of logging and the format of the output
        """
        file_handler = logging.FileHandler(f"./logs/{self.user}.log")
        file_handler.setLevel(logging.DEBUG)
        file_handler.setFormatter(self.formatter)
        return file_handler

    @property
    def stream_handler(self):
        """
        The console log handler. This defines the level of logging, and the format of the output.
        """
        stream_handler = logging.StreamHandler()
        stream_handler.setLevel(logging.DEBUG)
        stream_handler.setFormatter(self.formatter)
        return stream_handler
    
    def fill_user(self,selected_user):
        self.user=selected_user['Name']
        self.UID=selected_user['UID']
        self.prefs=json.loads(selected_user.get('Preferences',"{}"))
        self.log = logging.getLogger(self.__class__.__name__)
        self.log.setLevel(logging.DEBUG)
        self.log.addHandler(self.file_handler)
        self.log.addHandler(self.stream_handler)
        try:
            self.focal=str(selected_user['Focal']).split('/')
        except:
            pass
        g_text="match (u:User {UID:'"+self.UID+"'})--(g:Users {N:'Management'}) return u"
        outnode=self.graph.run(g_text).evaluate()
        if outnode:
            self.is_manager=True
        self.log.info(f"User {self.user} has logged in from IP address {pn.state.headers.get('X-Real-Ip')}")
        self.usergroups = self.graph.run("MATCH (:User {UID:'"+selected_user['UID']+"'})-->(u:Usergroup) return collect(u.Name)").evaluate()
        print("usergroups : ",self.usergroups)
        self.usergroup = self.usergroups[0]
        if 'Admins' in self.usergroups:
            print("setting as admin")
            self.is_admin=True
            self.customer = 'Internal'
        elif 'Pathologists' in self.usergroups:
            print("setting as pathologist")
            self.is_pathologist=True
            self.customer = 'Internal'
        # if 'RO_users' in self.usergroups:
        else:
            print("setting as RO user")
            self.is_ro=True
        if self.customer!='Internal':
            try:
                self.customer = self.graph.run("match (c:Customer)<--(:User {N:'"+self.user+"'}) return c.N").evaluate()
            except Exception as e:
                self.log.warning(f"User {self.user} not linked to any customer")
                self.customer = ''
        try:
            self.mail = selected_user.get('Mail','')
        except Exception as e:
            self.log.warning(f"User {self.user} has no mail address")
            self.mail = ''
        try:
            self.number = selected_user.get('Number','')
        except Exception as e:
            self.log.warning(f"User {self.user} has no phone number")
            self.number = ''
        self.create_log()
        return
    
    def save_prefs(self):
        self.graph.run("match (u:User {UID:'"+self.UID+"'}) set u.Preferences='"+json.dumps(self.prefs)+"'")
        return
    
    def login_check(self,event):
        # if not self.username.value == 'Archivist':
        #     pn.state.notifications.error("Regular login only available to archive account")
        #     return
        if '@' in self.username.value:
            g_text=f"match (u:User) WHERE u.Mail =~ '(?i){self.username.value}' return u"
        else:
            g_text=f"match (u:User) WHERE u.Name =~ '(?i){self.username.value}' return u"
        try:
            selected_user=self.graph.run(g_text).evaluate()
            print("selected user - ",selected_user)
        except Exception as e:
            self.log.warning(f"Invalid username or email entered: {self.username.value} from IP address {pn.state.headers.get('X-Real-Ip')}")
            error = pn.pane.HTML("""
                <div class="error">Username or Email address not found<div>
                """)
            self.modal_content.clear()
            self.modal_content.append(error)
            return_bt=pn.widgets.Button(name="Retry",button_type="danger")
            def callback(event):
                self.login_screen()
            return_bt.on_click(callback)
            self.modal_content.append(return_bt)
            return
        #print(hashlib.sha256(self.password.value.encode('utf-8')).hexdigest(),selected_user['password'])
        if hashlib.sha256(self.password.value.encode('utf-8')).hexdigest()!=selected_user['password']:
            self.log.warning(f"Failed login attempt for user {self.username.value} from IP address {pn.state.headers.get('X-Real-Ip')}")
            error = pn.pane.HTML("""
                <div class="error">You entered a wrong password<div>
                """)
            return_bt=pn.widgets.Button(name="Retry",button_type="danger")
            def callback(event):
                self.login_screen()
            return_bt.on_click(callback)
            self.modal_content.clear()
            self.modal_content.append(error)
            self.modal_content.append(return_bt)
        else:
            self.fill_user(selected_user)
            success=pn.pane.HTML("""
                <div class="error">You entered a wrong password<div>
                """)
            self.modal_content.clear()
            self.modal_content.append(success)
            self.login_state="active"
        return
        
    
    def login_screen(self):

        spacer = pn.Spacer(height=10, margin=0)
        html_pane = pn.pane.HTML("""
        <h1>Welcome</h1>
        """)
        self.username = pn.widgets.TextInput(name='Please log in', placeholder='Username or mail', css_classes=['CPath-Input2'], max_width=400, align='center')
        self.password = pn.widgets.PasswordInput(placeholder='Password', css_classes=['CPath-Input2','watch-for-enter'], max_width=400, align='center')
        button = pn.widgets.Button(name='Log in', css_classes=['CPathBtn2'], max_width=400, align='center')
        button.on_click(self.login_check)
        items = pn.Column(html_pane, self.username, self.password, button)
        main = pn.Column(items, align = "center", sizing_mode = "stretch_width",
                             max_width=1240)
        self.modal_content.clear()
        self.modal_content=pn.Column(spacer, main, sizing_mode= "stretch_both")
        return
    
    def build_user_stats(self):
        self.user_stats.clear()
        self.user_stats.append("Name : "+self.user)
        self.user_stats.append("Email : "+self.mail)
        self.user_stats.append("Number : "+self.number)
        self.user_stats.append("Groups : "+",".join(self.usergroups))
        btn = pn.widgets.Button(name="Clear cookies", width=80)
        btn.on_click(self.clear_cookies)
        self.user_stats.append(btn)
        return
    
    def clear_cookies(self, event=None):
        cookie = pn.pane.HTML("""
        <script>
            document.cookie = "access_token=; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
            document.cookie = "id_token=; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
            document.cookie = "user=; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
        </script>
        """)
        self.user_stats.append(cookie)
        return
    
    def build_user_prefs(self):
        self.user_prefs.clear()
        for key, value in self.prefs.items():
            self.user_prefs.append(str(key)+" : "+str(value))
        return
    
    def update_file_btn(self,event):
        selected_files=self.files_tabulator.selected_dataframe['filename'].values.tolist()
        zip_labels=[self.user+"/"+f for f in selected_files]
        home_folder="/tf/stores/AllFileStore/users/"+self.UID+"/"
        new_zip = BytesIO()
        try:
            with ZipFile(self.download_zip, 'r') as old_archive:
                with ZipFile(new_zip, 'w') as new_archive:
                    files_present=[f.filename for f in old_archive.filelist]
                    for item in old_archive.filelist:
                        if item.filename in zip_labels:
                            new_archive.writestr(item, old_archive.read(item.filename))
                    for l in zip_labels:
                        if not (l in files_present):
                            with open(home_folder+l.split('/')[-1],'r+b') as file_in:
                                file1 = ZipInfo(l)
                                new_archive.writestr(file1, file_in.read())
        except:
            with ZipFile(new_zip, 'w') as new_archive:
                for l in zip_labels:
                    with open(home_folder+l.split('/')[-1],'r+b') as file_in:
                        file1 = ZipInfo(l)
                        new_archive.writestr(file1, file_in.read())
        self.download_zip=new_zip
        self.download_zip.seek(0)
        if selected_files!=[]:
            self.download_btn.disabled=False
            self.download_btn.filename=self.user+"_"+datetime.datetime.now().strftime("%Y_%m_%d_%I_%M_%S")+".zip"
            self.download_btn.file=self.download_zip
        return
    
    def delete_user_files(self,event):
        selected_files=self.files_tabulator.selected_dataframe['filename'].values.tolist()
        home_folder="/tf/stores/AllFileStore/users/"+self.UID+"/"
        for f in selected_files:
            os.remove(home_folder+f)
        my_files=glob.glob("/tf/stores/AllFileStore/users/"+self.UID+"/*")
        short_user_files=sorted([f.split('/')[-1] for f in my_files])
        self.files_df=pd.DataFrame(columns=['filename'],data=short_user_files)
        self.files_tabulator=pn.widgets.Tabulator(self.files_df,show_index=False,selectable='checkbox', pagination='remote',max_height=500,page_size=10)
        self.files_watcher=self.files_tabulator.param.watch(self.update_file_btn,['selection'],onlychanged=True)
        self.user_files[1]=self.files_tabulator
        return
        
    
    def build_user_files(self):
        my_files=glob.glob("/tf/stores/AllFileStore/users/"+self.UID+"/*")
        short_user_files=sorted([f.split('/')[-1] for f in my_files])
        self.user_files.clear()
        #html_pane = pn.pane.HTML("""
        #<h1 style="color: #aa64cf; margin: 20px 20px 20px 40px; text-align: center;"> My Files</h1>
        #""")
        #self.user_files.append(html_pane)
        self.files_df=pd.DataFrame(columns=['filename'],data=short_user_files)
        self.files_tabulator=pn.widgets.Tabulator(self.files_df,show_index=False,selectable='checkbox', pagination='remote',max_height=500,page_size=10)
        self.files_watcher=self.files_tabulator.param.watch(self.update_file_btn,['selection'],onlychanged=True)
        delete_btn=pn.widgets.Button(name="Delete selection",button_type='danger',width=100)
        delete_btn.on_click(self.delete_user_files)
        self.download_zip=BytesIO()
        self.files_in_zip=[]
        self.download_btn=pn.widgets.FileDownload(name="",filename="- Select your files first",file=self.download_zip, disabled=True)
        self.user_files.append(pn.Row(self.download_btn))
        self.user_files.append(self.files_tabulator)
        return
    
    def build_user_logs(self):
        self.user_logs.clear()
        #html_pane = pn.pane.HTML("""
        #<h1 style="color: #aa64cf; margin: 20px 20px 20px 40px; text-align: center;"> My Logs</h1>
        #""")
        #self.user_logs.append(html_pane)
        with open("./logs/"+self.user+".log") as f:
            for line in f.readlines():
                self.user_logs.insert(0,line)
        return
    
    def complete_task(self, object_UID, task, status="Completed", comment = "", delete = True, task_UID = None, **kwargs):
        """
        Program function for creation of a stamp and deletion of the task object
        Uses JSON format
        """
        self.log.info(f"Updating task {task} for object with UID: '{object_UID}'")
        self.log.info(f"The following kwargs were entered:\n{kwargs}")
        task_dict = {"Name": task,
                     "Status":status,
                     "Stamp":f"Completed by {self.user} on {datetime.datetime.now().strftime('%Y-%m-%d at %H:%M')}",
                     "Comment":comment,
                     **kwargs}
        self.log.debug(f"The task dict looks as follows:\n{task_dict}")
        node = self.graph.run(f"MATCH (n) WHERE n.UID = '{object_UID}' return n").evaluate()
        stamp = node.get('Stamp', '')
        if stamp:
            try: #Try for backwards compatibility > shouldn't exist tho
                self.log.debug(f"Loading existing json to dict, json:\n{stamp}")
                stamp_dict = json.loads(stamp)
            except:
                try:
                    stamp_dict = {'Old Stamp':stamp,
                                  'Tasks':[]}
                except Exception as e:
                    self.log.exception(e)
                    return
        else:
            stamp_dict = {"Tasks":[]}
        stamp_dict['Tasks'].append(task_dict)
        newstamp = json.dumps(stamp_dict)
        self.graph.run(f"MATCH (n) WHERE n.UID = '{object_UID}' SET n.Stamp = '{newstamp}'")
        self.log.info(f"Updated task {task} for object with UID: '{object_UID}'")
        if delete:
            if task_UID:
                self.graph.run(f"MATCH (n)-->(t:Task {{UID:'{task_UID}'}}) WHERE n.UID = '{object_UID}' DETACH DELETE t")
            else:
                self.graph.run(f"MATCH (n)-->(t:Task {{T:'{task}'}}) WHERE n.UID = '{object_UID}' DETACH DELETE t")

Parameters

Name Type Default Kind
bases param.Parameterized -

Parameter Details

__init__: No parameters required. Initializes a User instance with default SYSTEM user, establishes database connections, checks for OAuth user from pn.state.user, and sets up logging infrastructure. Automatically determines login state based on OAuth availability and user existence in database.

Return Value

Instantiation returns a User object with initialized state. Key method returns: get_existing_logger returns Logger object or False; fill_user returns None but populates user attributes; save_prefs returns None; login_check returns None but updates login_state; complete_task returns None but updates database with task completion stamps.

Class Interface

Methods

__init__(self) -> None

Purpose: Initializes User instance, establishes database connection, checks for OAuth user, sets up logging, and creates UI components

Returns: None

create_log(self) -> None

Purpose: Creates or retrieves existing logger for the current user with file and stream handlers

Returns: None

get_existing_logger(self, loggername: str) -> logging.Logger | bool

Purpose: Checks if a logger already exists for the given name

Parameters:

  • loggername: The name of the logger to search for

Returns: Logger object if found, False otherwise

init_connections(self) -> None

Purpose: Initializes Neo4j graph database connection using config settings

Returns: None

@property formatter(self) -> logging.Formatter property

Purpose: Returns the logging formatter with timestamp, name, function, level, and message

Returns: Configured logging.Formatter instance

@property file_handler(self) -> logging.FileHandler property

Purpose: Returns file handler for logging to ./logs/{username}.log

Returns: Configured logging.FileHandler instance

@property stream_handler(self) -> logging.StreamHandler property

Purpose: Returns console stream handler for logging output

Returns: Configured logging.StreamHandler instance

fill_user(self, selected_user: dict) -> None

Purpose: Populates user attributes from Neo4j user node, determines roles, and sets up logging

Parameters:

  • selected_user: Dictionary containing user node properties from Neo4j (Name, UID, Preferences, Mail, Number, etc.)

Returns: None, but populates instance attributes: user, UID, prefs, focal, usergroups, usergroup, is_admin, is_manager, is_pathologist, is_ro, customer, mail, number

save_prefs(self) -> None

Purpose: Saves user preferences dictionary to Neo4j as JSON string

Returns: None

login_check(self, event) -> None

Purpose: Validates username/email and password against Neo4j database, updates login state and modal content

Parameters:

  • event: Panel button click event (not used directly)

Returns: None, but updates login_state to 'active' on success and populates modal_content with error or success messages

login_screen(self) -> None

Purpose: Builds and displays login UI with username, password inputs and login button in modal_content

Returns: None, but populates modal_content with login form

build_user_stats(self) -> None

Purpose: Builds user statistics panel showing name, email, number, groups, and cookie clear button

Returns: None, but populates user_stats Panel Column

clear_cookies(self, event=None) -> None

Purpose: Injects JavaScript to clear OAuth cookies (access_token, id_token, user)

Parameters:

  • event: Optional Panel button click event

Returns: None, but appends cookie-clearing HTML to user_stats

build_user_prefs(self) -> None

Purpose: Builds user preferences panel displaying all key-value pairs from prefs dictionary

Returns: None, but populates user_prefs Panel Column

update_file_btn(self, event) -> None

Purpose: Updates download button with selected files packaged in a ZIP archive

Parameters:

  • event: Panel Tabulator selection change event

Returns: None, but updates download_btn with new ZIP file and enables it

delete_user_files(self, event) -> None

Purpose: Deletes selected files from user's directory and refreshes file list

Parameters:

  • event: Panel button click event

Returns: None, but removes files from filesystem and updates files_tabulator

build_user_files(self) -> None

Purpose: Builds file management panel with tabulator showing user files, download and delete buttons

Returns: None, but populates user_files Panel Column with file management UI

build_user_logs(self) -> None

Purpose: Builds log viewer panel displaying user's log file in reverse chronological order

Returns: None, but populates user_logs Panel Column with log entries

complete_task(self, object_UID: str, task: str, status: str = 'Completed', comment: str = '', delete: bool = True, task_UID: str = None, **kwargs) -> None

Purpose: Marks a task as complete by adding a stamp to the object node and optionally deleting the task node

Parameters:

  • object_UID: UID of the Neo4j node to update with task completion
  • task: Name of the task being completed
  • status: Status of task completion (default: 'Completed')
  • comment: Optional comment about task completion
  • delete: Whether to delete the task node after completion (default: True)
  • task_UID: Optional specific UID of task node to delete
  • kwargs: Additional key-value pairs to include in task stamp

Returns: None, but updates object node's Stamp property with JSON task data and optionally deletes task node

Attributes

Name Type Description Scope
login_state param.String Current login state: 'undefined' (initial), 'local' (needs login), or 'active' (logged in) class
graph Graph Neo4j graph database connection instance instance
user str Username of current user (default: 'SYSTEM') instance
number str Phone number of user instance
mail str Email address of user instance
customer str Customer organization user belongs to (or 'Internal') instance
usergroup str Primary usergroup name instance
usergroups list List of all usergroup names user belongs to instance
UID str Unique identifier for user in database instance
prefs dict User preferences dictionary loaded from JSON instance
is_admin bool True if user is in Admins usergroup instance
is_manager bool True if user is linked to Management usergroup instance
is_pathologist bool True if user is in Pathologists usergroup instance
is_ro bool True if user is read-only (not admin/pathologist) instance
log logging.Logger Logger instance for user activity logging instance
modal_content pn.Column Panel Column for displaying modal content (login screens, errors) instance
user_stats pn.Column Panel Column displaying user statistics and information instance
user_prefs pn.Column Panel Column displaying user preferences instance
user_files pn.Column Panel Column for file management interface instance
user_logs pn.Column Panel Column displaying user activity logs instance
username pn.widgets.TextInput Login form username input widget instance
password pn.widgets.PasswordInput Login form password input widget instance
files_df pd.DataFrame DataFrame containing user's file list instance
files_tabulator pn.widgets.Tabulator Tabulator widget for displaying and selecting user files instance
download_btn pn.widgets.FileDownload File download button for selected files as ZIP instance
download_zip BytesIO In-memory ZIP file for downloading selected files instance
focal list List of focal points split from user's Focal property instance

Dependencies

  • logging
  • neo4j_driver
  • param
  • panel
  • hashlib
  • glob
  • pandas
  • io
  • datetime
  • os
  • zipfile
  • json
  • string
  • secrets
  • config

Required Imports

import logging
from neo4j_driver import *
import param
import panel as pn
import hashlib
import glob
import pandas as pd
from io import BytesIO
import datetime
import os
from zipfile import ZipFile, ZipInfo
import json
import config

Usage Example

# Initialize user (typically done once per session)
user = User()

# Check login state
if user.login_state == 'local':
    # Show login screen
    user.login_screen()
    # Display modal_content in Panel app
    # After login, user.login_state becomes 'active'

# Access user information
print(f"User: {user.user}")
print(f"Email: {user.mail}")
print(f"Is Admin: {user.is_admin}")

# Work with preferences
user.prefs['theme'] = 'dark'
user.save_prefs()

# Build UI components
user.build_user_stats()
user.build_user_files()
user.build_user_logs()

# Complete a task
user.complete_task(
    object_UID='obj123',
    task='Review',
    status='Completed',
    comment='All checks passed',
    reviewer=user.user
)

# Access UI components
stats_panel = user.user_stats
files_panel = user.user_files

Best Practices

  • Always check login_state before accessing user-specific features ('undefined', 'local', or 'active')
  • Call init_connections() if database connection is lost to re-establish Graph connection
  • Use save_prefs() after modifying user.prefs dictionary to persist changes to database
  • Passwords are stored as SHA256 hashes; use hashlib.sha256(password.encode('utf-8')).hexdigest() for comparison
  • User files are stored in /tf/stores/AllFileStore/users/{UID}/ directory structure
  • Log files are created per user in ./logs/{username}.log
  • The class uses Panel reactive components; ensure Panel server is running for UI features
  • Role flags (is_admin, is_manager, is_pathologist, is_ro) are mutually exclusive based on usergroup membership
  • Task completion uses JSON-formatted stamps stored in node.Stamp property
  • File operations (download, delete) work with selected rows in files_tabulator widget
  • Always handle exceptions when accessing user properties that may not exist (mail, number, customer)
  • The modal_content attribute should be displayed in a Panel modal for login screens
  • User preferences are stored as JSON strings in Neo4j and parsed to dict on load

Tags

authentication authorization user-management role-based-access-control neo4j panel logging file-management preferences oauth session-management task-tracking audit-logging

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