feat(spam-moderation): implement spam detection and moderation for team invitations and signups

- Integrated SpamDetector utility to check for spam patterns in team names and user names during signup and invitation processes.
- Enhanced TeamMembersController to log and block obvious spam invitations while allowing suspicious ones for review.
- Updated passport-local-signup strategy to flag high-risk signups and log details for admin review.
- Added moderation routes to handle spam-related actions and integrated rate limiting for invitation requests.
- Improved frontend components to provide real-time spam warnings during organization name input, enhancing user feedback.

worklenz-frontend/src/components/account-setup/organization-step.tsx

@@ -1,10 +1,11 @@
 import React, { useEffect, useRef, useState } from 'react';
-import { Form, Input, InputRef, Typography, Card, Tooltip } from '@/shared/antd-imports';
+import { Form, Input, InputRef, Typography, Card, Tooltip, Alert } from '@/shared/antd-imports';
 import { useDispatch, useSelector } from 'react-redux';
 import { useTranslation } from 'react-i18next';
 import { setOrganizationName } from '@/features/account-setup/account-setup.slice';
 import { RootState } from '@/app/store';
 import { sanitizeInput } from '@/utils/sanitizeInput';
+import { SpamDetector } from '@/utils/spamDetector';
 
 const { Title, Paragraph, Text } = Typography;
 
@@ -29,6 +30,7 @@ export const OrganizationStep: React.FC<Props> = ({
   const dispatch = useDispatch();
   const { organizationName } = useSelector((state: RootState) => state.accountSetupReducer);
   const inputRef = useRef<InputRef>(null);
+  const [spamWarning, setSpamWarning] = useState<string>('');
 
   // Autofill organization name if not already set
   useEffect(() => {
@@ -44,7 +46,19 @@ export const OrganizationStep: React.FC<Props> = ({
   };
 
   const handleOrgNameChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    const sanitizedValue = sanitizeInput(e.target.value);
+    const rawValue = e.target.value;
+    const sanitizedValue = sanitizeInput(rawValue);
+    
+    // Check for spam patterns
+    const spamCheck = SpamDetector.detectSpam(rawValue);
+    if (spamCheck.isSpam) {
+      setSpamWarning(`Warning: ${spamCheck.reasons.join(', ')}`);
+    } else if (SpamDetector.isHighRiskContent(rawValue)) {
+      setSpamWarning('Warning: Content appears to contain suspicious links or patterns');
+    } else {
+      setSpamWarning('');
+    }
+    
     dispatch(setOrganizationName(sanitizedValue));
   };
 
@@ -60,12 +74,25 @@ export const OrganizationStep: React.FC<Props> = ({
         </Paragraph>
       </div>
 
+      {/* Spam Warning */}
+      {spamWarning && (
+        <div className="mb-4">
+          <Alert
+            message={spamWarning}
+            type="warning"
+            showIcon
+            closable
+            onClose={() => setSpamWarning('')}
+          />
+        </div>
+      )}
+
       {/* Main Form Card */}
       <div className="mb-6">
         <Card 
           className="border-2 hover:shadow-md transition-all duration-200"
           style={{ 
-            borderColor: token?.colorPrimary,
+            borderColor: spamWarning ? token?.colorWarning : token?.colorPrimary,
             backgroundColor: token?.colorBgContainer 
           }}
         >

worklenz-frontend/src/components/admin-center/overview/organization-name/organization-name.tsx

@@ -1,10 +1,11 @@
 import { adminCenterApiService } from '@/api/admin-center/admin-center.api.service';
 import logger from '@/utils/errorLogger';
 import { EnterOutlined, EditOutlined } from '@/shared/antd-imports';
-import { Card, Button, Tooltip, Typography } from '@/shared/antd-imports';
+import { Card, Button, Tooltip, Typography, Alert } from '@/shared/antd-imports';
 import TextArea from 'antd/es/input/TextArea';
 import { TFunction } from 'i18next';
 import { useState, useEffect } from 'react';
+import { SpamDetector } from '@/utils/spamDetector';
 
 interface OrganizationNameProps {
   themeMode: string;
@@ -16,6 +17,7 @@ interface OrganizationNameProps {
 const OrganizationName = ({ themeMode, name, t, refetch }: OrganizationNameProps) => {
   const [isEditable, setIsEditable] = useState(false);
   const [newName, setNewName] = useState(name);
+  const [spamWarning, setSpamWarning] = useState<string>('');
 
   useEffect(() => {
     setNewName(name);
@@ -34,7 +36,18 @@ const OrganizationName = ({ themeMode, name, t, refetch }: OrganizationNameProps
   };
 
   const handleNameChange = (e: React.ChangeEvent<HTMLTextAreaElement>) => {
-    setNewName(e.target.value);
+    const value = e.target.value;
+    setNewName(value);
+    
+    // Check for spam patterns
+    const spamCheck = SpamDetector.detectSpam(value);
+    if (spamCheck.isSpam) {
+      setSpamWarning(`Warning: ${spamCheck.reasons.join(', ')}`);
+    } else if (SpamDetector.isHighRiskContent(value)) {
+      setSpamWarning('Warning: Content appears to contain suspicious links or patterns');
+    } else {
+      setSpamWarning('');
+    }
   };
 
   const updateOrganizationName = async () => {
@@ -62,6 +75,16 @@ const OrganizationName = ({ themeMode, name, t, refetch }: OrganizationNameProps
       <Typography.Title level={5} style={{ margin: 0, marginBottom: '0.5rem' }}>
         {t('name')}
       </Typography.Title>
+      {spamWarning && (
+        <Alert
+          message={spamWarning}
+          type="warning"
+          showIcon
+          closable
+          onClose={() => setSpamWarning('')}
+          style={{ marginBottom: '8px' }}
+        />
+      )}
       <div style={{ paddingTop: '8px' }}>
         <div style={{ marginBottom: '8px' }}>
           {isEditable ? (

worklenz-frontend/src/components/settings/edit-team-name-modal.tsx

@@ -1,9 +1,10 @@
-import { Divider, Form, Input, message, Modal, Typography } from '@/shared/antd-imports';
+import { Divider, Form, Input, message, Modal, Typography, Alert } from '@/shared/antd-imports';
 import { useEffect, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { useAppDispatch } from '@/hooks/useAppDispatch';
 import { editTeamName, fetchTeams } from '@/features/teams/teamSlice';
 import { ITeamGetResponse } from '@/types/teams/team.type';
+import { SpamDetector } from '@/utils/spamDetector';
 
 interface EditTeamNameModalProps {
   team: ITeamGetResponse | null;
@@ -16,6 +17,7 @@ const EditTeamNameModal = ({ team, isModalOpen, onCancel }: EditTeamNameModalPro
   const dispatch = useAppDispatch();
   const [form] = Form.useForm();
   const [updating, setUpdating] = useState(false);
+  const [spamWarning, setSpamWarning] = useState<string>('');
 
   useEffect(() => {
     if (team) {
@@ -67,6 +69,16 @@ const EditTeamNameModal = ({ team, isModalOpen, onCancel }: EditTeamNameModalPro
       destroyOnClose={true}
     >
       <Form form={form} layout="vertical" onFinish={handleFormSubmit}>
+        {spamWarning && (
+          <Alert
+            message={spamWarning}
+            type="warning"
+            showIcon
+            closable
+            onClose={() => setSpamWarning('')}
+            style={{ marginBottom: '16px' }}
+          />
+        )}
         <Form.Item
           name="name"
           label={t('name')}
@@ -77,7 +89,20 @@ const EditTeamNameModal = ({ team, isModalOpen, onCancel }: EditTeamNameModalPro
             },
           ]}
         >
-          <Input placeholder={t('namePlaceholder')} />
+          <Input 
+            placeholder={t('namePlaceholder')} 
+            onChange={(e) => {
+              const value = e.target.value;
+              const spamCheck = SpamDetector.detectSpam(value);
+              if (spamCheck.isSpam) {
+                setSpamWarning(`Warning: ${spamCheck.reasons.join(', ')}`);
+              } else if (SpamDetector.isHighRiskContent(value)) {
+                setSpamWarning('Warning: Content appears to contain suspicious links or patterns');
+              } else {
+                setSpamWarning('');
+              }
+            }}
+          />
         </Form.Item>
       </Form>
     </Modal>

worklenz-frontend/src/utils/spamDetector.ts

@@ -0,0 +1,141 @@
+export interface SpamDetectionResult {
+  isSpam: boolean;
+  score: number;
+  reasons: string[];
+}
+
+export class SpamDetector {
+  private static readonly SPAM_PATTERNS = [
+    // URLs and links
+    /https?:\/\//i,
+    /www\./i,
+    /\b\w+\.(com|net|org|io|co|me|ly|tk|ml|ga|cf)\b/i,
+    
+    // Common spam phrases
+    /click\s*(here|link|now)/i,
+    /urgent|emergency|immediate/i,
+    /win|won|winner|prize|reward/i,
+    /free|bonus|gift|offer/i,
+    /check\s*(out|this|pay)/i,
+    /blockchain|crypto|bitcoin|compensation/i,
+    /cash|money|dollars?|\$\d+/i,
+    
+    // Excessive special characters
+    /[!]{3,}/,
+    /[🔔⬅👆💰$]{2,}/,
+    /\b[A-Z]{5,}\b/,
+    
+    // Suspicious formatting
+    /\s{3,}/,
+    /[.]{3,}/
+  ];
+
+  private static readonly SUSPICIOUS_WORDS = [
+    'urgent', 'emergency', 'click', 'link', 'win', 'winner', 'prize', 
+    'free', 'bonus', 'cash', 'money', 'blockchain', 'crypto', 'compensation',
+    'check', 'pay', 'reward', 'offer', 'gift'
+  ];
+
+  public static detectSpam(text: string): SpamDetectionResult {
+    if (!text || typeof text !== 'string') {
+      return { isSpam: false, score: 0, reasons: [] };
+    }
+
+    const normalizedText = text.toLowerCase().trim();
+    const reasons: string[] = [];
+    let score = 0;
+
+    // Check for URL patterns
+    for (const pattern of this.SPAM_PATTERNS) {
+      if (pattern.test(text)) {
+        score += 30;
+        if (pattern.toString().includes('https?') || pattern.toString().includes('www')) {
+          reasons.push('Contains suspicious URLs or links');
+        } else if (pattern.toString().includes('urgent|emergency')) {
+          reasons.push('Contains urgent/emergency language');
+        } else if (pattern.toString().includes('win|won|winner')) {
+          reasons.push('Contains prize/winning language');
+        } else if (pattern.toString().includes('cash|money')) {
+          reasons.push('Contains monetary references');
+        } else if (pattern.toString().includes('blockchain|crypto')) {
+          reasons.push('Contains cryptocurrency references');
+        } else if (pattern.toString().includes('[!]{3,}')) {
+          reasons.push('Excessive use of exclamation marks');
+        } else if (pattern.toString().includes('[🔔⬅👆💰$]')) {
+          reasons.push('Contains suspicious emojis or symbols');
+        } else if (pattern.toString().includes('[A-Z]{5,}')) {
+          reasons.push('Contains excessive capital letters');
+        }
+      }
+    }
+
+    // Check for excessive suspicious words
+    const suspiciousWordCount = this.SUSPICIOUS_WORDS.filter(word => 
+      normalizedText.includes(word)
+    ).length;
+    
+    if (suspiciousWordCount >= 2) {
+      score += suspiciousWordCount * 15;
+      reasons.push(`Contains ${suspiciousWordCount} suspicious words`);
+    }
+
+    // Check text length - very short or very long names are suspicious
+    if (text.length < 2) {
+      score += 20;
+      reasons.push('Text too short');
+    } else if (text.length > 100) {
+      score += 25;
+      reasons.push('Text unusually long');
+    }
+
+    // Check for repeated characters
+    if (/(.)\1{4,}/.test(text)) {
+      score += 20;
+      reasons.push('Contains repeated characters');
+    }
+
+    // Check for mixed scripts (potential homograph attack)
+    const hasLatin = /[a-zA-Z]/.test(text);
+    const hasCyrillic = /[\u0400-\u04FF]/.test(text);
+    const hasGreek = /[\u0370-\u03FF]/.test(text);
+    
+    if ((hasLatin && hasCyrillic) || (hasLatin && hasGreek)) {
+      score += 40;
+      reasons.push('Contains mixed character scripts');
+    }
+
+    const isSpam = score >= 50;
+    
+    return {
+      isSpam,
+      score,
+      reasons: [...new Set(reasons)] // Remove duplicates
+    };
+  }
+
+  public static isHighRiskContent(text: string): boolean {
+    const patterns = [
+      /gclnk\.com/i,
+      /bit\.ly/i,
+      /tinyurl/i,
+      /\$\d{3,}/,
+      /blockchain.*compensation/i,
+      /urgent.*check/i
+    ];
+
+    return patterns.some(pattern => pattern.test(text));
+  }
+
+  public static sanitizeText(text: string): string {
+    if (!text || typeof text !== 'string') return '';
+    
+    return text
+      .trim()
+      .replace(/https?:\/\/[^\s]+/gi, '[URL_REMOVED]')
+      .replace(/www\.[^\s]+/gi, '[URL_REMOVED]')
+      .replace(/[🔔⬅👆💰$]{2,}/g, '')
+      .replace(/[!]{3,}/g, '!')
+      .replace(/\s{3,}/g, ' ')
+      .substring(0, 100);
+  }
+}