mraidChecker

package.json

@@ -1,7 +1,7 @@
 {
   "name": "hpl-toolbox",
   "displayName": "HPL Toolbox",
-  "description": "Bundled tools: PLEC Upload, AppLovin Demo Upload, Base64 Asset Scanner, Daily Update. Local HTML Host.",
+  "description": "Bundled tools: PLEC Upload, AppLovin Demo Upload, Base64 Asset Scanner, MRAID Checker, Daily Update. Local HTML Host.",
   "version": "0.1.5",
   "publisher": "hesukastro",
   "license": "UNLICENSED",
@@ -30,6 +30,10 @@
         "command": "hplToolbox.openBase64Scanner",
         "title": "HPL Toolbox: Open Base64 Scanner"
       },
+      {
+        "command": "hplToolbox.openMraidChecker",
+        "title": "HPL Toolbox: Open MRAID Checker"
+      },
       {
         "command": "hplToolbox.openDailyUpdate",
         "title": "HPL Toolbox: Open Daily Update"

src/extension.ts

@@ -3,6 +3,7 @@ import { LauncherViewProvider } from './launcherView';
 import { openPlecUpload } from './tools/plecUpload';
 import { openApplovinUpload } from './tools/applovinUpload';
 import { openBase64Scanner } from './tools/base64Scanner';
+import { openMraidChecker } from './tools/mraidChecker';
 import { openDailyUpdate } from './tools/dailyUpdate';
 import { openSendToMobile } from './tools/sendToMobile';
 
@@ -11,6 +12,7 @@ export function activate(context: vscode.ExtensionContext) {
     vscode.commands.registerCommand('hplToolbox.openPlecUpload', () => openPlecUpload(context)),
     vscode.commands.registerCommand('hplToolbox.openApplovinUpload', () => openApplovinUpload(context)),
     vscode.commands.registerCommand('hplToolbox.openBase64Scanner', () => openBase64Scanner(context)),
+    vscode.commands.registerCommand('hplToolbox.openMraidChecker', () => openMraidChecker(context)),
     vscode.commands.registerCommand('hplToolbox.openDailyUpdate', () => openDailyUpdate(context)),
     vscode.commands.registerCommand('hplToolbox.openSendToMobile', () => openSendToMobile(context)),
     vscode.window.registerWebviewViewProvider('hplToolbox.launcher', new LauncherViewProvider(context))

src/launcherView.ts

@@ -1,28 +1,86 @@
 import * as vscode from 'vscode';
 
+const BETA_TOOLS_ENABLED_KEY = 'hplToolbox.betaTools.enabled';
+
+interface ToolDefinition {
+  command: string;
+  title: string;
+  description: string;
+  beta?: boolean;
+}
+
+const TOOLS: ToolDefinition[] = [
+  {
+    command: 'hplToolbox.openPlecUpload',
+    title: 'PLEC Upload',
+    description: 'Upload HTML to internal PLEC server',
+  },
+  {
+    command: 'hplToolbox.openApplovinUpload',
+    title: 'AppLovin Demo Upload',
+    description: 'Upload to p.applov.in (QR preview)',
+  },
+  {
+    command: 'hplToolbox.openBase64Scanner',
+    title: 'Base64 Scanner',
+    description: 'Find non-base64 assets in HTML',
+  },
+  {
+    command: 'hplToolbox.openMraidChecker',
+    title: 'MRAID Checker',
+    description: 'Check MRAID requirements and best practices',
+    beta: true,
+  },
+  {
+    command: 'hplToolbox.openDailyUpdate',
+    title: 'Daily Update',
+    description: 'Compose & copy a daily status',
+  },
+  {
+    command: 'hplToolbox.openSendToMobile',
+    title: 'Send To Mobile',
+    description: 'Share HTML to a phone via LAN + QR',
+  },
+];
+
 export class LauncherViewProvider implements vscode.WebviewViewProvider {
   constructor(private readonly context: vscode.ExtensionContext) {}
 
   resolveWebviewView(view: vscode.WebviewView) {
     view.webview.options = { enableScripts: true };
     const version = this.context.extension.packageJSON.version as string;
-    view.webview.html = getHtml(version);
+    const betaToolsEnabled = this.context.globalState.get<boolean>(BETA_TOOLS_ENABLED_KEY, false);
-    view.webview.onDidReceiveMessage((msg) => {
+    view.webview.html = getHtml(version, betaToolsEnabled);
+    view.webview.onDidReceiveMessage(async (msg) => {
       if (msg?.type === 'open' && typeof msg.command === 'string') {
         vscode.commands.executeCommand(msg.command);
+      } else if (msg?.type === 'setBetaToolsEnabled' && typeof msg.enabled === 'boolean') {
+        await this.context.globalState.update(BETA_TOOLS_ENABLED_KEY, msg.enabled);
+        view.webview.html = getHtml(version, msg.enabled);
       }
     });
   }
 }
 
-function getHtml(version: string): string {
+function getHtml(version: string, betaToolsEnabled: boolean): string {
+  const visibleTools = TOOLS.filter(tool => betaToolsEnabled || !tool.beta);
+  const hiddenBetaCount = TOOLS.filter(tool => tool.beta).length - visibleTools.filter(tool => tool.beta).length;
+  const toolButtons = visibleTools.map(renderToolButton).join('\n');
   return `<!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8" />
 <style>
-  body { font-family: var(--vscode-font-family); color: var(--vscode-foreground); padding: 12px 8px; }
+  body {
+    min-height: calc(100vh - 24px);
+    display: flex;
+    flex-direction: column;
+    font-family: var(--vscode-font-family);
+    color: var(--vscode-foreground);
+    padding: 12px 8px;
+  }
   h3 { margin: 0 0 12px 0; font-size: 11px; text-transform: uppercase; letter-spacing: 0.6px; opacity: 0.7; }
+  .tools { flex: 1; }
   .tool-btn {
     display: block; width: 100%; text-align: left;
     padding: 8px 10px; margin-bottom: 6px;
@@ -34,31 +92,48 @@ function getHtml(version: string): string {
   .tool-btn:hover {
     background: var(--vscode-button-secondaryHoverBackground);
   }
+  .tool-title { display: flex; align-items: center; gap: 6px; }
   .tool-desc { display: block; font-size: 11px; opacity: 0.7; margin-top: 2px; }
+  .beta-badge {
+    padding: 1px 5px;
+    border: 1px solid var(--vscode-panel-border);
+    border-radius: 3px;
+    color: var(--vscode-descriptionForeground);
+    font-size: 10px;
+    text-transform: uppercase;
+  }
+  .beta-toggle {
+    margin-top: 12px;
+    padding-top: 10px;
+    border-top: 1px solid var(--vscode-panel-border);
+  }
+  .beta-toggle button {
+    width: 100%;
+    padding: 7px 10px;
+    background: var(--vscode-button-secondaryBackground);
+    color: var(--vscode-button-secondaryForeground);
+    border: 1px solid var(--vscode-panel-border);
+    border-radius: 3px;
+    cursor: pointer;
+    text-align: left;
+  }
+  .beta-toggle button:hover {
+    background: var(--vscode-button-secondaryHoverBackground);
+  }
+  .beta-note { display: block; margin-top: 3px; color: var(--vscode-descriptionForeground); font-size: 11px; }
 </style>
 </head>
 <body>
   <h3>HPL Toolbox ${version}</h3>
-  <button class="tool-btn" data-cmd="hplToolbox.openPlecUpload">
+  <div class="tools">
-    PLEC Upload
+${toolButtons}
-    <span class="tool-desc">Upload HTML to internal PLEC server</span>
+  </div>
-  </button>
+  <div class="beta-toggle">
-  <button class="tool-btn" data-cmd="hplToolbox.openApplovinUpload">
+    <button id="betaToggle" data-enabled="${betaToolsEnabled ? 'true' : 'false'}">
-    AppLovin Demo Upload
+      ${betaToolsEnabled ? 'Disable Beta Tools' : 'Enable Beta Tools'}
-    <span class="tool-desc">Upload to p.applov.in (QR preview)</span>
+      <span class="beta-note">${betaToolsEnabled ? 'Beta tools are visible in this launcher.' : `${hiddenBetaCount} beta tool(s) hidden until enabled.`}</span>
-  </button>
+    </button>
-  <button class="tool-btn" data-cmd="hplToolbox.openBase64Scanner">
+  </div>
-    Base64 Scanner
-    <span class="tool-desc">Find non-base64 assets in HTML</span>
-  </button>
-  <button class="tool-btn" data-cmd="hplToolbox.openDailyUpdate">
-    Daily Update
-    <span class="tool-desc">Compose &amp; copy a daily status</span>
-  </button>
-  <button class="tool-btn" data-cmd="hplToolbox.openSendToMobile">
-    Send To Mobile
-    <span class="tool-desc">Share HTML to a phone via LAN + QR</span>
-  </button>
 <script>
   const vscode = acquireVsCodeApi();
   document.querySelectorAll('.tool-btn').forEach((btn) => {
@@ -66,7 +141,28 @@ function getHtml(version: string): string {
       vscode.postMessage({ type: 'open', command: btn.dataset.cmd });
     });
   });
+  document.getElementById('betaToggle').addEventListener('click', (event) => {
+    const enabled = event.currentTarget.dataset.enabled === 'true';
+    vscode.postMessage({ type: 'setBetaToolsEnabled', enabled: !enabled });
+  });
 </script>
 </body>
 </html>`;
 }
+
+function renderToolButton(tool: ToolDefinition): string {
+  return `  <button class="tool-btn" data-cmd="${escapeHtml(tool.command)}">
+    <span class="tool-title">${escapeHtml(tool.title)}${tool.beta ? ' <span class="beta-badge">Beta</span>' : ''}</span>
+    <span class="tool-desc">${escapeHtml(tool.description)}</span>
+  </button>`;
+}
+
+function escapeHtml(value: string): string {
+  return value.replace(/[&<>"']/g, ch => ({
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '"': '&quot;',
+    "'": '&#39;',
+  }[ch] ?? ch));
+}

src/tools/mraidChecker.ts

@@ -0,0 +1,496 @@
+import * as vscode from 'vscode';
+import * as fs from 'fs';
+import * as path from 'path';
+import { singletonPanel } from './shared';
+
+const store: { panel: vscode.WebviewPanel | null } = { panel: null };
+
+type Severity = 'requirement' | 'best-practice';
+
+interface MraidIssue {
+  id: string;
+  severity: Severity;
+  title: string;
+  detail: string;
+  line?: number;
+  reference: string;
+}
+
+interface MraidResult {
+  file: string;
+  ok: boolean;
+  issues: MraidIssue[];
+}
+
+interface MraidRule {
+  id: string;
+  severity: Severity;
+  title: string;
+  detail: string;
+  reference: string;
+  test: (ctx: ScanContext) => MraidIssue | null;
+}
+
+interface ScanContext {
+  html: string;
+  scriptText: string;
+  lowerHtml: string;
+  lowerScript: string;
+  mraidCallLines: Map<string, number>;
+}
+
+export function openMraidChecker(_context: vscode.ExtensionContext) {
+  const { panel, isNew } = singletonPanel(store, 'hplToolbox.mraidChecker', 'MRAID Checker');
+  if (!isNew) return;
+
+  panel.webview.html = getHtml();
+  panel.webview.onDidReceiveMessage(async (msg) => {
+    if (msg.type === 'ready') {
+      const ws = vscode.workspace.workspaceFolders?.[0];
+      if (ws) {
+        const distPath = path.join(ws.uri.fsPath, 'dist');
+        if (fs.existsSync(distPath) && fs.statSync(distPath).isDirectory()) {
+          panel.webview.postMessage({ type: 'folderPicked', path: distPath });
+        }
+      }
+    } else if (msg.type === 'pickFolder') {
+      const picked = await vscode.window.showOpenDialog({
+        canSelectFolders: true,
+        canSelectFiles: false,
+        canSelectMany: false,
+        openLabel: 'Select Folder',
+      });
+      if (picked && picked[0]) {
+        panel.webview.postMessage({ type: 'folderPicked', path: picked[0].fsPath });
+      }
+    } else if (msg.type === 'pickFiles') {
+      const picked = await vscode.window.showOpenDialog({
+        canSelectFolders: false,
+        canSelectFiles: true,
+        canSelectMany: true,
+        openLabel: 'Select Files',
+        filters: { 'HTML': ['html', 'htm'] },
+      });
+      if (picked && picked.length) {
+        panel.webview.postMessage({ type: 'filesPicked', paths: picked.map(u => u.fsPath) });
+      }
+    } else if (msg.type === 'scan') {
+      const folder: string | undefined = msg.folder;
+      const files: string[] | undefined = msg.files;
+      let targets: string[] = [];
+      let baseDir = '';
+      let skipped = 0;
+      if (files && files.length) {
+        const existing = files.filter(f => fs.existsSync(f));
+        targets = existing.filter(isSupportedMraidBuild);
+        skipped = existing.length - targets.length;
+        baseDir = targets.length ? commonBaseDir(targets) : '';
+      } else if (folder && fs.existsSync(folder)) {
+        const allHtmlFiles = await collectHtmlFiles(folder);
+        targets = allHtmlFiles.filter(isSupportedMraidBuild);
+        skipped = allHtmlFiles.length - targets.length;
+        baseDir = folder;
+      } else {
+        panel.webview.postMessage({ type: 'results', results: [], error: 'Pick a folder or files first' });
+        return;
+      }
+
+      if (targets.length === 0) {
+        panel.webview.postMessage({
+          type: 'results',
+          results: [],
+          skipped,
+          error: 'No AppLovin, ironSource, or Unity HTML builds were found.',
+        });
+        return;
+      }
+
+      const results: MraidResult[] = [];
+      for (const file of targets) {
+        try {
+          const content = fs.readFileSync(file, 'utf8');
+          const issues = checkMraid(content);
+          const display = baseDir ? path.relative(baseDir, file) || path.basename(file) : file;
+          results.push({ file: display, ok: issues.length === 0, issues });
+        } catch {
+          // Skip unreadable files, matching the scanner pattern used elsewhere.
+        }
+      }
+      panel.webview.postMessage({ type: 'results', results, skipped });
+    }
+  });
+}
+
+function commonBaseDir(files: string[]): string {
+  if (files.length === 0) return '';
+  if (files.length === 1) return path.dirname(files[0]);
+  const split = files.map(f => path.dirname(f).split(path.sep));
+  const first = split[0];
+  let i = 0;
+  while (i < first.length && split.every(parts => parts[i] === first[i])) i++;
+  return first.slice(0, i).join(path.sep);
+}
+
+async function collectHtmlFiles(root: string): Promise<string[]> {
+  const out: string[] = [];
+  const stack: string[] = [root];
+  while (stack.length) {
+    const dir = stack.pop()!;
+    let entries: fs.Dirent[];
+    try {
+      entries = fs.readdirSync(dir, { withFileTypes: true });
+    } catch {
+      continue;
+    }
+    for (const e of entries) {
+      const full = path.join(dir, e.name);
+      if (e.isDirectory()) {
+        if (e.name === 'node_modules' || e.name === '.git') continue;
+        stack.push(full);
+      } else if (e.isFile() && /\.html?$/i.test(e.name)) {
+        out.push(full);
+      }
+    }
+  }
+  return out;
+}
+
+function checkMraid(html: string): MraidIssue[] {
+  const scriptText = extractScriptText(html);
+  const ctx: ScanContext = {
+    html,
+    scriptText,
+    lowerHtml: html.toLowerCase(),
+    lowerScript: scriptText.toLowerCase(),
+    mraidCallLines: collectMraidCallLines(html),
+  };
+
+  return MRAID_RULES
+    .map(rule => rule.test(ctx))
+    .filter((issue): issue is MraidIssue => issue !== null);
+}
+
+function extractScriptText(html: string): string {
+  const scripts: string[] = [];
+  const scriptRegex = /<script\b[^>]*>([\s\S]*?)<\/script>/gi;
+  let m: RegExpExecArray | null;
+  while ((m = scriptRegex.exec(html)) !== null) {
+    scripts.push(m[1]);
+  }
+  return scripts.join('\n');
+}
+
+function collectMraidCallLines(html: string): Map<string, number> {
+  const calls = new Map<string, number>();
+  const lines = html.split(/\r?\n/);
+  const callRegex = /\bmraid\s*\.\s*([a-zA-Z_$][\w$]*)\s*\(/g;
+  for (let i = 0; i < lines.length; i++) {
+    let m: RegExpExecArray | null;
+    while ((m = callRegex.exec(lines[i])) !== null) {
+      if (!calls.has(m[1])) calls.set(m[1], i + 1);
+    }
+  }
+  return calls;
+}
+
+function isSupportedMraidBuild(filePath: string): boolean {
+  const normalized = filePath.toLowerCase().replace(/\\/g, '/');
+  return /(^|[\/._ -])(al|applovin|app-lovin|is|iron.?source|un|unity|unityads|unity-ads)([\/._ -]|$)/i.test(normalized);
+}
+
+function hasMraidReference(ctx: ScanContext): boolean {
+  return /\bmraid\b/i.test(ctx.html);
+}
+
+function hasMraidCall(ctx: ScanContext, method: string): boolean {
+  return ctx.mraidCallLines.has(method);
+}
+
+function mraidLine(ctx: ScanContext, method: string): number | undefined {
+  return ctx.mraidCallLines.get(method);
+}
+
+function issue(rule: MraidRule, line?: number): MraidIssue {
+  return {
+    id: rule.id,
+    severity: rule.severity,
+    title: rule.title,
+    detail: rule.detail,
+    line,
+    reference: rule.reference,
+  };
+}
+
+function hasReadyGate(ctx: ScanContext): boolean {
+  return (
+    /mraid\s*\.\s*addEventListener\s*\(\s*['"]ready['"]/i.test(ctx.scriptText) ||
+    /mraid\s*\.\s*getState\s*\(\s*\)\s*={0,2}\s*['"]loading['"]/i.test(ctx.scriptText) ||
+    /['"]loading['"]\s*={0,2}\s*mraid\s*\.\s*getState\s*\(\s*\)/i.test(ctx.scriptText)
+  );
+}
+
+function hasEventListener(ctx: ScanContext, eventName: string): boolean {
+  const pattern = new RegExp(`mraid\\s*\\.\\s*addEventListener\\s*\\(\\s*['"]${eventName}['"]`, 'i');
+  return pattern.test(ctx.scriptText);
+}
+
+function hasSupportCheck(ctx: ScanContext, feature: string): boolean {
+  const pattern = new RegExp(`mraid\\s*\\.\\s*supports\\s*\\(\\s*['"]${feature}['"]`, 'i');
+  return pattern.test(ctx.scriptText);
+}
+
+function usesDirectBrowserNavigation(ctx: ScanContext): boolean {
+  return (
+    /\bwindow\s*\.\s*open\s*\(/i.test(ctx.scriptText) ||
+    /\blocation\s*\.\s*(href|assign|replace)\b/i.test(ctx.scriptText)
+  );
+}
+
+const MRAID_REFERENCE = 'MRAID 3.0 specification and MRAID 3.0 Best Practices Guide in mraidDocuments/';
+
+const MRAID_RULES: MraidRule[] = [
+  {
+    id: 'mraid-reference',
+    severity: 'requirement',
+    title: 'MRAID API reference not found',
+    detail: 'Playable HTML should use the injected mraid object when it depends on an MRAID container.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => hasMraidReference(ctx) ? null : issue(MRAID_RULES_BY_ID['mraid-reference']),
+  },
+  {
+    id: 'ready-gate',
+    severity: 'requirement',
+    title: 'MRAID ready state is not guarded',
+    detail: 'Gate ad startup behind mraid.ready, or call startup immediately only when mraid.getState() is not loading.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => !hasMraidReference(ctx) || hasReadyGate(ctx) ? null : issue(MRAID_RULES_BY_ID['ready-gate']),
+  },
+  {
+    id: 'error-listener',
+    severity: 'best-practice',
+    title: 'No MRAID error listener found',
+    detail: 'Listen for mraid error events so unsupported or failed MRAID calls can be logged or handled gracefully.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => !hasMraidReference(ctx) || hasEventListener(ctx, 'error') ? null : issue(MRAID_RULES_BY_ID['error-listener']),
+  },
+  {
+    id: 'viewability',
+    severity: 'best-practice',
+    title: 'Viewability handling not found',
+    detail: 'Use mraid.isViewable() and/or viewableChange before starting animation, audio, video, or timers.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => {
+      const hasVisibilitySignal = hasMraidCall(ctx, 'isViewable') || hasEventListener(ctx, 'viewableChange') || hasEventListener(ctx, 'exposureChange');
+      return !hasMraidReference(ctx) || hasVisibilitySignal ? null : issue(MRAID_RULES_BY_ID['viewability']);
+    },
+  },
+  {
+    id: 'open-api',
+    severity: 'requirement',
+    title: 'Browser navigation used instead of mraid.open',
+    detail: 'Use mraid.open(url) for click-through navigation inside an MRAID ad container.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => usesDirectBrowserNavigation(ctx) && !hasMraidCall(ctx, 'open') ? issue(MRAID_RULES_BY_ID['open-api']) : null,
+  },
+  {
+    id: 'close-api',
+    severity: 'best-practice',
+    title: 'No mraid.close call found',
+    detail: 'If the creative renders its own close control, wire that control to mraid.close().',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => {
+      const appearsToHaveCloseUi = /\b(close|dismiss|skip)\b/i.test(ctx.html);
+      return appearsToHaveCloseUi && !hasMraidCall(ctx, 'close') ? issue(MRAID_RULES_BY_ID['close-api']) : null;
+    },
+  },
+  {
+    id: 'expand-support',
+    severity: 'requirement',
+    title: 'mraid.expand used without supports check',
+    detail: 'Check mraid.supports("expand") before using expand behavior.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => hasMraidCall(ctx, 'expand') && !hasSupportCheck(ctx, 'expand') ? issue(MRAID_RULES_BY_ID['expand-support'], mraidLine(ctx, 'expand')) : null,
+  },
+  {
+    id: 'resize-support',
+    severity: 'requirement',
+    title: 'mraid.resize used without supports check',
+    detail: 'Check mraid.supports("resize") before using resize behavior.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => hasMraidCall(ctx, 'resize') && !hasSupportCheck(ctx, 'resize') ? issue(MRAID_RULES_BY_ID['resize-support'], mraidLine(ctx, 'resize')) : null,
+  },
+  {
+    id: 'orientation-support',
+    severity: 'best-practice',
+    title: 'Orientation properties set without supports check',
+    detail: 'Check mraid.supports("orientation") before requiring orientation behavior.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => hasMraidCall(ctx, 'setOrientationProperties') && !hasSupportCheck(ctx, 'orientation') ? issue(MRAID_RULES_BY_ID['orientation-support'], mraidLine(ctx, 'setOrientationProperties')) : null,
+  },
+  {
+    id: 'size-change',
+    severity: 'best-practice',
+    title: 'No sizeChange listener found',
+    detail: 'Listen for sizeChange when layout depends on container size, resize, expand, or orientation behavior.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => {
+      const dependsOnSize = hasMraidCall(ctx, 'getMaxSize') || hasMraidCall(ctx, 'getScreenSize') || hasMraidCall(ctx, 'resize') || hasMraidCall(ctx, 'expand') || hasMraidCall(ctx, 'setOrientationProperties');
+      return dependsOnSize && !hasEventListener(ctx, 'sizeChange') ? issue(MRAID_RULES_BY_ID['size-change']) : null;
+    },
+  },
+  {
+    id: 'state-change',
+    severity: 'best-practice',
+    title: 'No stateChange listener found',
+    detail: 'Listen for stateChange when using expand, resize, close, or other state-changing container behavior.',
+    reference: MRAID_REFERENCE,
+    test: (ctx) => {
+      const changesState = hasMraidCall(ctx, 'expand') || hasMraidCall(ctx, 'resize') || hasMraidCall(ctx, 'close');
+      return changesState && !hasEventListener(ctx, 'stateChange') ? issue(MRAID_RULES_BY_ID['state-change']) : null;
+    },
+  },
+];
+
+const MRAID_RULES_BY_ID = MRAID_RULES.reduce<Record<string, MraidRule>>((acc, rule) => {
+  acc[rule.id] = rule;
+  return acc;
+}, {});
+
+function getHtml(): string {
+  return `<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8" />
+<style>
+  body { font-family: var(--vscode-font-family); padding: 12px; color: var(--vscode-foreground); }
+  .row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
+  input[type=text] { flex: 1; padding: 4px 6px; background: var(--vscode-input-background); color: var(--vscode-input-foreground); border: 1px solid var(--vscode-input-border); }
+  button { padding: 4px 12px; background: var(--vscode-button-background); color: var(--vscode-button-foreground); border: none; cursor: pointer; }
+  button:hover { background: var(--vscode-button-hoverBackground); }
+  .summary { margin-top: 12px; opacity: 0.85; }
+  .docs { color: var(--vscode-descriptionForeground); margin-bottom: 12px; }
+  .row-result { padding: 8px 0; border-bottom: 1px solid var(--vscode-panel-border); }
+  .file-head { display: flex; gap: 8px; align-items: baseline; font-family: var(--vscode-editor-font-family); font-size: 12px; }
+  .mark { width: 18px; flex-shrink: 0; font-weight: bold; }
+  .ok { color: #3fb950; }
+  .bad { color: #f85149; }
+  .file-name { word-break: break-all; }
+  .counts { color: var(--vscode-descriptionForeground); margin-left: auto; white-space: nowrap; }
+  .issues { margin: 6px 0 0 26px; padding: 0; }
+  .issue { margin: 6px 0; list-style: none; }
+  .badge { display: inline-block; min-width: 82px; margin-right: 6px; padding: 1px 5px; border-radius: 3px; font-size: 11px; text-align: center; }
+  .requirement { color: #ffb4ad; background: rgba(248,81,73,0.18); }
+  .best-practice { color: #ffd580; background: rgba(210,153,34,0.18); }
+  .issue-title { font-weight: 600; }
+  .issue-detail { color: var(--vscode-descriptionForeground); margin-top: 2px; }
+</style>
+</head>
+<body>
+  <h2>MRAID Checker</h2>
+  <div class="docs">Static checks for AppLovin, ironSource, and Unity HTML builds based on MRAID 3.0 requirements and best practices from mraidDocuments/.</div>
+  <div class="row">
+    <input id="folder" type="text" placeholder="Folder to scan recursively..." />
+    <button id="pick">Browse Folder...</button>
+    <button id="pickFiles">Pick Files...</button>
+    <button id="scan">Scan</button>
+  </div>
+  <div id="selection" class="summary"></div>
+  <div id="status"></div>
+  <div id="results"></div>
+<script>
+  const vscode = acquireVsCodeApi();
+  vscode.postMessage({ type: 'ready' });
+  const folderEl = document.getElementById('folder');
+  const statusEl = document.getElementById('status');
+  const resultsEl = document.getElementById('results');
+  const selectionEl = document.getElementById('selection');
+  let pickedFiles = [];
+
+  function clearFiles() {
+    pickedFiles = [];
+    selectionEl.textContent = '';
+  }
+
+  function escapeText(value) {
+    return String(value).replace(/[&<>"']/g, (ch) => ({
+      '&': '&amp;',
+      '<': '&lt;',
+      '>': '&gt;',
+      '"': '&quot;',
+      "'": '&#39;'
+    }[ch]));
+  }
+
+  folderEl.addEventListener('input', clearFiles);
+
+  document.getElementById('pick').addEventListener('click', () => {
+    vscode.postMessage({ type: 'pickFolder' });
+  });
+  document.getElementById('pickFiles').addEventListener('click', () => {
+    vscode.postMessage({ type: 'pickFiles' });
+  });
+  document.getElementById('scan').addEventListener('click', () => {
+    statusEl.textContent = 'Scanning...';
+    resultsEl.innerHTML = '';
+    if (pickedFiles.length) {
+      vscode.postMessage({ type: 'scan', files: pickedFiles });
+    } else {
+      const folder = folderEl.value.trim();
+      if (!folder) { statusEl.textContent = 'Pick a folder or files first.'; return; }
+      vscode.postMessage({ type: 'scan', folder });
+    }
+  });
+
+  window.addEventListener('message', (event) => {
+    const msg = event.data;
+    if (msg.type === 'folderPicked') {
+      folderEl.value = msg.path;
+      clearFiles();
+    } else if (msg.type === 'filesPicked') {
+      pickedFiles = msg.paths;
+      folderEl.value = '';
+      selectionEl.textContent = pickedFiles.length + ' file(s) selected';
+    } else if (msg.type === 'results') {
+      if (msg.error) { statusEl.textContent = 'Error: ' + msg.error; return; }
+      const total = msg.results.length;
+      const withIssues = msg.results.filter(r => !r.ok).length;
+      const requirements = msg.results.reduce((n, r) => n + r.issues.filter(i => i.severity === 'requirement').length, 0);
+      const bestPractices = msg.results.reduce((n, r) => n + r.issues.filter(i => i.severity === 'best-practice').length, 0);
+      const skipped = Number(msg.skipped || 0);
+      const skippedText = skipped ? ' Skipped ' + skipped + ' non-target HTML file(s).' : '';
+      statusEl.innerHTML = '<div class="summary">Scanned ' + total + ' AppLovin/ironSource/Unity HTML file(s). ' + withIssues + ' file(s) need review. ' + requirements + ' requirement issue(s), ' + bestPractices + ' best-practice warning(s).' + skippedText + '</div>';
+      resultsEl.innerHTML = '';
+      for (const r of msg.results) {
+        const requirementsForFile = r.issues.filter(i => i.severity === 'requirement').length;
+        const bestPracticesForFile = r.issues.filter(i => i.severity === 'best-practice').length;
+        const row = document.createElement('div');
+        row.className = 'row-result';
+        row.innerHTML =
+          '<div class="file-head">' +
+          '<span class="mark ' + (r.ok ? 'ok' : 'bad') + '">' + (r.ok ? 'OK' : 'X') + '</span>' +
+          '<span class="file-name">' + escapeText(r.file) + '</span>' +
+          '<span class="counts">' + requirementsForFile + ' req / ' + bestPracticesForFile + ' bp</span>' +
+          '</div>';
+        if (!r.ok) {
+          const list = document.createElement('ul');
+          list.className = 'issues';
+          for (const i of r.issues) {
+            const item = document.createElement('li');
+            item.className = 'issue';
+            const line = i.line ? ' line ' + i.line + ':' : '';
+            item.innerHTML =
+              '<span class="badge ' + i.severity + '">' + escapeText(i.severity) + '</span>' +
+              '<span class="issue-title">' + escapeText(line + ' ' + i.title) + '</span>' +
+              '<div class="issue-detail">' + escapeText(i.detail) + '</div>';
+            list.appendChild(item);
+          }
+          row.appendChild(list);
+        }
+        resultsEl.appendChild(row);
+      }
+    }
+  });
+</script>
+</body>
+</html>`;
+}