feat: iframe proxy test — fetch Sechenov page, strip X-Frame, rewrite URLs

2026-04-21 16:55:10 +03:00
parent 8878cba3d1
commit 29ac92aa3e
2 changed files with 175 additions and 0 deletions
--- a/public/iframe.html
+++ b/public/iframe.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Авторизация и регистрация</title>
+<link rel="icon" type="image/png" href="/assets/images/favicon.png">
+<style>
+  html, body { margin: 0; padding: 0; height: 100%; overflow: hidden; }
+  #portal {
+    display: block;
+    border: 0;
+    width: 100%;
+    height: calc(100vh - 50px);
+  }
+  /* chat stays fixed at the bottom 50px of viewport */
+  .chat-overlay {
+    position: fixed;
+    left: 0; right: 0; bottom: 0;
+    background: #fff;
+    border-top: 4px solid #003571;
+    z-index: 9999;
+    font-family: Arial, Helvetica, sans-serif;
+  }
+  #chat-output-tiny {
+    position: fixed;
+    left: 0; right: 0;
+    bottom: 50px;
+    max-height: 200px;
+    overflow-y: auto;
+    padding: 4px 15px;
+    font-size: 10px;
+    color: #c4c4c4;
+    line-height: 1.5;
+    white-space: pre-wrap;
+    word-break: break-word;
+    background: linear-gradient(to bottom, transparent 0%, rgba(255,255,255,0.92) 30%, #fff 100%);
+    pointer-events: none;
+  }
+  #chat-output-tiny:empty { display: none; }
+  .chat-overlay .inner {
+    max-width: 970px; margin: 0 auto;
+    padding: 8px 15px;
+  }
+  #chat-input {
+    width: 100%;
+    border: none;
+    background: transparent;
+    color: #f2f2f2;
+    font-size: 14px;
+    outline: none;
+    resize: none;
+    height: 28px;
+    max-height: 28px;
+    min-height: 28px;
+    line-height: 1.5;
+    padding: 0;
+    overflow: hidden;
+    white-space: nowrap;
+    caret-color: #c4c4c4;
+    font-family: inherit;
+  }
+  #chat-input::placeholder { color: transparent; }
+</style>
+</head>
+<body>
+
+<iframe id="portal" src="/proxy/auth.php"></iframe>
+
+<div id="chat-output-tiny"></div>
+
+<div class="chat-overlay">
+  <div class="inner">
+    <textarea id="chat-input" autocomplete="off" spellcheck="false" rows="1"></textarea>
+  </div>
+</div>
+
+<script>
+  const inputEl  = document.getElementById('chat-input');
+  const outputEl = document.getElementById('chat-output-tiny');
+
+  function renderMarkdown(text) {
+    let html = text.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
+    html = html.replace(/```[\w]*\n?([\s\S]*?)```/g, (_,c) => `<pre>${c.trim()}</pre>`);
+    html = html.replace(/`([^`]+)`/g, '<code>$1</code>');
+    html = html.replace(/\*\*([^*]+)\*\*/g, '<strong>$1</strong>');
+    return html;
+  }
+
+  let inFlight = false;
+  async function send(text) {
+    if (inFlight || !text.trim()) return;
+    inFlight = true;
+    outputEl.innerHTML = '';
+    let fullText = '';
+    try {
+      const resp = await fetch('/api/chat', {
+        method: 'POST',
+        headers: {'Content-Type':'application/json'},
+        body: JSON.stringify({text, model: 'sonnet'}),
+      });
+      const reader = resp.body.getReader();
+      const decoder = new TextDecoder();
+      let buf = '';
+      while (true) {
+        const {done, value} = await reader.read();
+        if (done) break;
+        buf += decoder.decode(value, {stream:true});
+        const parts = buf.split('\n\n');
+        buf = parts.pop();
+        for (const part of parts) {
+          if (!part.startsWith('data: ')) continue;
+          const raw = part.slice(6).trim();
+          if (raw === '[DONE]') continue;
+          try {
+            const obj = JSON.parse(raw);
+            if (obj.text) {
+              fullText += obj.text;
+              outputEl.innerHTML = renderMarkdown(fullText);
+            }
+          } catch(e) {}
+        }
+      }
+    } catch(e) {} finally { inFlight = false; }
+  }
+
+  inputEl.addEventListener('paste', () => {
+    setTimeout(() => {
+      const t = inputEl.value.trim();
+      if (t) send(t);
+    }, 50);
+  });
+</script>
+</body>
+</html>
--- a/server.js
+++ b/server.js
@@ -137,4 +137,44 @@ app.post('/api/chat', async (req, res) => {
    }
 });

+// ── iframe proxy: fetch student.sechenov.ru, strip X-Frame-Options, rewrite URLs ──
+app.get('/proxy/*', async (req, res) => {
+    const upstreamPath = req.url.replace(/^\/proxy/, '') || '/';
+    const upstreamUrl = 'https://student.sechenov.ru' + upstreamPath;
+
+    try {
+        const r = await fetch(upstreamUrl, {
+            headers: {
+                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
+                'Accept': req.headers.accept || '*/*',
+                'Accept-Language': req.headers['accept-language'] || 'ru,en;q=0.9',
+            },
+        });
+
+        const ct = r.headers.get('content-type') || 'application/octet-stream';
+        res.status(r.status);
+        res.setHeader('Content-Type', ct);
+        // strip framing restrictions
+        res.removeHeader('X-Frame-Options');
+        res.removeHeader('Content-Security-Policy');
+
+        if (ct.includes('text/html')) {
+            let html = await r.text();
+            // rewrite relative URLs to absolute so browser loads assets directly
+            html = html
+                .replace(/(href|src|action)="\/(?!\/)/g, '$1="https://student.sechenov.ru/')
+                .replace(/url\(["']?\/(?!\/)/g, 'url(https://student.sechenov.ru/')
+                // neutralize meta CSP if present
+                .replace(/<meta[^>]+http-equiv=["']?Content-Security-Policy["']?[^>]*>/gi, '');
+            res.send(html);
+        } else {
+            // stream binary/text as-is
+            const buf = Buffer.from(await r.arrayBuffer());
+            res.send(buf);
+        }
+    } catch (e) {
+        res.status(502).send('proxy error: ' + e.message);
+    }
+});
+
 app.listen(8108, () => console.log('sechenov :8108'));