Add security enhancements: linting infrastructure and ReDoS prevention

.eslintignore

@@ -0,0 +1,10 @@
+# Dependencies
+node_modules/
+
+# Distribution directories
+OSINT-Extension-Prod/
+OSINT-Extension-Testing-v1.3.1/
+OSINT-Extension-ChromeStore-v1.3.1/
+
+# Documentation
+docs/

.eslintrc.json

@@ -0,0 +1,38 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "webextensions": true
+  },
+  "extends": [
+    "eslint:recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  },
+  "plugins": [
+    "security",
+    "no-unsanitized"
+  ],
+  "rules": {
+    "no-unsanitized/method": "error",
+    "no-unsanitized/property": "error",
+    "security/detect-object-injection": "warn",
+    "security/detect-non-literal-regexp": "warn",
+    "security/detect-unsafe-regex": "error",
+    "security/detect-buffer-noassert": "error",
+    "security/detect-child-process": "error",
+    "security/detect-disable-mustache-escape": "error",
+    "security/detect-eval-with-expression": "error",
+    "security/detect-no-csrf-before-method-override": "error",
+    "security/detect-non-literal-fs-filename": "warn",
+    "security/detect-non-literal-require": "warn",
+    "security/detect-possible-timing-attacks": "warn",
+    "security/detect-pseudoRandomBytes": "error",
+    "no-eval": "error",
+    "no-implied-eval": "error",
+    "no-new-func": "error",
+    "no-script-url": "error"
+  }
+}

.github/workflows/lint.yml

@@ -0,0 +1,41 @@
+name: Lint
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ '**' ]
+
+jobs:
+  lint:
+    name: Run Linters
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20.x'
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run ESLint
+      id: eslint
+      continue-on-error: true
+      run: npm run lint
+
+    - name: Run web-ext lint
+      id: webext-lint
+      continue-on-error: true
+      run: npm run lint:webext
+
+    - name: Check linting results
+      if: steps.eslint.outcome == 'failure' || steps.webext-lint.outcome == 'failure'
+      run: |
+        echo "::error::One or more linting checks failed"
+        exit 1

.gitignore

@@ -2,6 +2,9 @@
 node_modules/
 jspm_packages/
 
+# Package manager lock files
+package-lock.json
+
 # Build outputs
 dist/
 build/
@@ -38,6 +41,7 @@ Thumbs.db
 # Chrome Extension specific
 *.pem
 *.crx
+web-ext-artifacts/
 
 # Personal notes
 notes.txt