Add Telegram contact API with JSONL backup and real form errors.

Wire the anonymous form to a VPS Python endpoint that notifies Telegram, persists submissions locally, and stops faking success on failure.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -1,3 +1,6 @@
 .tools/
 *.zip
 .DS_Store
+.env
+api/.env
+api/messages.jsonl

api/.env.example

@@ -0,0 +1,12 @@
+# Copy to api/.env on the VPS and fill in real values.
+# Never commit .env.
+
+TELEGRAM_BOT_TOKEN=1234567890:ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
+TELEGRAM_CHAT_ID=123456789
+
+# Bind address (default: loopback only)
+HOST=127.0.0.1
+PORT=8787
+
+# Local JSONL backup of submissions (relative to api/ or absolute path)
+MESSAGES_FILE=messages.jsonl

api/README.md

@@ -0,0 +1,109 @@
+# Contact API → Telegram
+
+Small Python 3 (stdlib only) service that accepts `POST /api/contact` and forwards the message to Telegram.
+
+## Setup (once)
+
+1. Create a bot with [@BotFather](https://t.me/BotFather) → copy the token.
+2. Open a chat with the bot and press **Start**.
+3. Get your numeric chat id (`@userinfobot`, or call `getUpdates` after messaging the bot).
+4. On the VPS:
+
+```bash
+cd /path/to/site/api
+cp .env.example .env
+# edit .env — set TELEGRAM_BOT_TOKEN and TELEGRAM_CHAT_ID
+```
+
+## Local smoke test
+
+```bash
+cd api
+cp .env.example .env   # fill tokens
+python3 contact_server.py
+```
+
+```bash
+curl -sS -X POST http://127.0.0.1:8787/api/contact \
+  -H 'Content-Type: application/json' \
+  -d '{"name":"Test","contact":"@you","message":"hello"}'
+```
+
+Health check: `GET /api/health` → `{"ok":true,"configured":true}`.
+
+## systemd
+
+`/etc/systemd/system/428th-contact.service`:
+
+```ini
+[Unit]
+Description=428th contact form → Telegram
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/var/www/428th.com/api
+EnvironmentFile=/var/www/428th.com/api/.env
+ExecStart=/usr/bin/python3 /var/www/428th.com/api/contact_server.py
+Restart=always
+RestartSec=3
+User=www-data
+Group=www-data
+
+[Install]
+WantedBy=multi-user.target
+```
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable --now 428th-contact
+sudo systemctl status 428th-contact
+```
+
+Adjust `WorkingDirectory`, `EnvironmentFile`, `User`, and paths to match your VPS layout.
+
+## nginx
+
+Inside the HTTPS server block for `428th.com`:
+
+```nginx
+location /api/contact {
+    proxy_pass http://127.0.0.1:8787/api/contact;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    client_max_body_size 16k;
+}
+
+# optional
+location /api/health {
+    proxy_pass http://127.0.0.1:8787/api/health;
+    proxy_set_header Host $host;
+}
+```
+
+Then:
+
+```bash
+sudo nginx -t && sudo systemctl reload nginx
+```
+
+Deploy updated static files (`common.js`, built HTML) as usual so the form shows real errors and includes the honeypot field.
+
+## Message backup
+
+Every valid submission is appended to `messages.jsonl` (override with `MESSAGES_FILE` in `.env`), one JSON object per line:
+
+```json
+{"ts":"2026-07-26T16:40:00Z","name":"…","contact":"…","message":"…","ip":"1.2.3.4","telegram_ok":true,"telegram_error":null}
+```
+
+Backup is written even if Telegram fails (`telegram_ok: false`), so you still have the text on disk. Honeypot hits are not stored. Keep this file private (same permissions as `.env`); it is gitignored.
+
+## Behaviour notes
+
+- Honeypot field `website`: if filled, returns `200` without notifying Telegram or writing a backup.
+- In-memory rate limit: 5 POSTs per IP per 60 seconds → `429`.
+- Field limits: name/contact ≤ 200 chars, message ≤ 4000.

api/contact_server.py

@@ -0,0 +1,268 @@
+#!/usr/bin/env python3
+"""Minimal /api/contact endpoint — forwards form submissions to Telegram."""
+
+from __future__ import annotations
+
+import json
+import os
+import threading
+import time
+import urllib.error
+import urllib.parse
+import urllib.request
+from collections import defaultdict, deque
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from pathlib import Path
+
+# ---------- config ----------
+
+ROOT = Path(__file__).resolve().parent
+MAX_NAME = 200
+MAX_CONTACT = 200
+MAX_MESSAGE = 4000
+MAX_BODY = 16_384
+RATE_LIMIT = 5  # requests
+RATE_WINDOW = 60  # seconds
+
+
+def load_dotenv(path: Path) -> None:
+    if not path.is_file():
+        return
+    for raw in path.read_text(encoding="utf-8").splitlines():
+        line = raw.strip()
+        if not line or line.startswith("#") or "=" not in line:
+            continue
+        key, _, value = line.partition("=")
+        key = key.strip()
+        value = value.strip().strip("'").strip('"')
+        if key and key not in os.environ:
+            os.environ[key] = value
+
+
+load_dotenv(ROOT / ".env")
+
+BOT_TOKEN = os.environ.get("TELEGRAM_BOT_TOKEN", "").strip()
+CHAT_ID = os.environ.get("TELEGRAM_CHAT_ID", "").strip()
+HOST = os.environ.get("HOST", "127.0.0.1").strip() or "127.0.0.1"
+PORT = int(os.environ.get("PORT", "8787"))
+_backup_raw = os.environ.get("MESSAGES_FILE", "messages.jsonl").strip() or "messages.jsonl"
+MESSAGES_FILE = Path(_backup_raw)
+if not MESSAGES_FILE.is_absolute():
+    MESSAGES_FILE = ROOT / MESSAGES_FILE
+
+_rate_lock = threading.Lock()
+_file_lock = threading.Lock()
+_rate_hits: dict[str, deque[float]] = defaultdict(deque)
+
+
+def client_ip(handler: BaseHTTPRequestHandler) -> str:
+    forwarded = handler.headers.get("X-Real-IP") or handler.headers.get("X-Forwarded-For")
+    if forwarded:
+        return forwarded.split(",")[0].strip()
+    return handler.client_address[0]
+
+
+def rate_limited(ip: str) -> bool:
+    now = time.monotonic()
+    with _rate_lock:
+        q = _rate_hits[ip]
+        while q and now - q[0] > RATE_WINDOW:
+            q.popleft()
+        if len(q) >= RATE_LIMIT:
+            return True
+        q.append(now)
+        return False
+
+
+def send_telegram(text: str) -> None:
+    if not BOT_TOKEN or not CHAT_ID:
+        raise RuntimeError("Telegram is not configured")
+    url = f"https://api.telegram.org/bot{BOT_TOKEN}/sendMessage"
+    payload = urllib.parse.urlencode(
+        {
+            "chat_id": CHAT_ID,
+            "text": text,
+            "disable_web_page_preview": "1",
+        }
+    ).encode("utf-8")
+    req = urllib.request.Request(
+        url,
+        data=payload,
+        method="POST",
+        headers={"Content-Type": "application/x-www-form-urlencoded"},
+    )
+    with urllib.request.urlopen(req, timeout=15) as resp:
+        body = json.loads(resp.read().decode("utf-8"))
+    if not body.get("ok"):
+        raise RuntimeError("Telegram API rejected the message")
+
+
+def append_message(record: dict) -> None:
+    """Append one JSON line to the backup file (best-effort durable log)."""
+    line = json.dumps(record, ensure_ascii=False) + "\n"
+    with _file_lock:
+        MESSAGES_FILE.parent.mkdir(parents=True, exist_ok=True)
+        with MESSAGES_FILE.open("a", encoding="utf-8") as f:
+            f.write(line)
+            f.flush()
+            os.fsync(f.fileno())
+
+
+def validate_fields(data: dict) -> tuple[str, str, str] | str:
+    """Return (name, contact, message) or an error code string."""
+    if not isinstance(data, dict):
+        return "invalid"
+
+    # Honeypot — treat as success upstream; caller checks separately.
+    website = data.get("website", "")
+    if isinstance(website, str) and website.strip():
+        return "honeypot"
+
+    def field(key: str, max_len: int) -> str | None:
+        raw = data.get(key, "")
+        if not isinstance(raw, str):
+            return None
+        value = raw.strip()
+        if not value or len(value) > max_len:
+            return None
+        return value
+
+    name = field("name", MAX_NAME)
+    contact = field("contact", MAX_CONTACT)
+    message = field("message", MAX_MESSAGE)
+    if name is None or contact is None or message is None:
+        return "invalid"
+    return name, contact, message
+
+
+class ContactHandler(BaseHTTPRequestHandler):
+    server_version = "428thContact/1.0"
+
+    def log_message(self, fmt: str, *args) -> None:
+        # Avoid logging bodies; keep a short access line.
+        sys_stderr = __import__("sys").stderr
+        print(
+            f"{client_ip(self)} - [{self.log_date_time_string()}] {fmt % args}",
+            file=sys_stderr,
+        )
+
+    def _json(self, status: int, payload: dict) -> None:
+        body = json.dumps(payload).encode("utf-8")
+        self.send_response(status)
+        self.send_header("Content-Type", "application/json; charset=utf-8")
+        self.send_header("Content-Length", str(len(body)))
+        self.send_header("Cache-Control", "no-store")
+        self.end_headers()
+        self.wfile.write(body)
+
+    def do_OPTIONS(self) -> None:
+        # Same-origin from the site; allow preflight just in case.
+        if self.path.rstrip("/") != "/api/contact":
+            self.send_error(404)
+            return
+        self.send_response(204)
+        self.send_header("Access-Control-Allow-Methods", "POST, OPTIONS")
+        self.send_header("Access-Control-Allow-Headers", "Content-Type")
+        self.send_header("Content-Length", "0")
+        self.end_headers()
+
+    def do_POST(self) -> None:
+        if self.path.rstrip("/") != "/api/contact":
+            self._json(404, {"ok": False, "error": "not_found"})
+            return
+
+        ip = client_ip(self)
+        if rate_limited(ip):
+            self._json(429, {"ok": False, "error": "rate_limited"})
+            return
+
+        length_raw = self.headers.get("Content-Length", "0")
+        try:
+            length = int(length_raw)
+        except ValueError:
+            self._json(400, {"ok": False, "error": "invalid"})
+            return
+        if length < 0 or length > MAX_BODY:
+            self._json(400, {"ok": False, "error": "invalid"})
+            return
+
+        raw = self.rfile.read(length)
+        try:
+            data = json.loads(raw.decode("utf-8"))
+        except (UnicodeDecodeError, json.JSONDecodeError):
+            self._json(400, {"ok": False, "error": "invalid"})
+            return
+
+        result = validate_fields(data)
+        if result == "honeypot":
+            self._json(200, {"ok": True})
+            return
+        if isinstance(result, str):
+            self._json(400, {"ok": False, "error": "invalid"})
+            return
+
+        name, contact, message = result
+        text = (
+            "New contact form\n"
+            f"Name: {name}\n"
+            f"Contact: {contact}\n"
+            f"Message:\n{message}"
+        )
+
+        telegram_ok = False
+        telegram_error = None
+        try:
+            send_telegram(text)
+            telegram_ok = True
+        except (urllib.error.URLError, TimeoutError, RuntimeError, OSError) as err:
+            telegram_error = type(err).__name__
+
+        try:
+            append_message(
+                {
+                    "ts": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
+                    "name": name,
+                    "contact": contact,
+                    "message": message,
+                    "ip": ip,
+                    "telegram_ok": telegram_ok,
+                    "telegram_error": telegram_error,
+                }
+            )
+        except OSError:
+            # Disk failure after Telegram: still report based on Telegram.
+            if not telegram_ok:
+                self._json(502, {"ok": False, "error": "upstream"})
+                return
+            # Telegram delivered; backup failed — accept but log.
+            print(f"WARNING: failed to append backup for {ip}", flush=True)
+
+        if not telegram_ok:
+            self._json(502, {"ok": False, "error": "upstream"})
+            return
+
+        self._json(200, {"ok": True})
+
+    def do_GET(self) -> None:
+        if self.path.rstrip("/") == "/api/health":
+            configured = bool(BOT_TOKEN and CHAT_ID)
+            self._json(200, {"ok": True, "configured": configured})
+            return
+        self._json(404, {"ok": False, "error": "not_found"})
+
+
+def main() -> None:
+    if not BOT_TOKEN or not CHAT_ID:
+        print(
+            "WARNING: TELEGRAM_BOT_TOKEN / TELEGRAM_CHAT_ID not set — "
+            "POSTs will fail with 502 until configured.",
+            flush=True,
+        )
+    print(f"message backup file: {MESSAGES_FILE}", flush=True)
+    httpd = ThreadingHTTPServer((HOST, PORT), ContactHandler)
+    print(f"contact API listening on http://{HOST}:{PORT}/api/contact", flush=True)
+    httpd.serve_forever()
+
+
+if __name__ == "__main__":
+    main()

common.js

@@ -449,19 +449,17 @@ function initContactForm(){
     const data = Object.fromEntries(new FormData(form).entries());
 
     try {
-      const res = await fetch('/api/contact', { // placeholder — заменит программист
+      const res = await fetch('/api/contact', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify(data)
       });
-      if (!res.ok) throw new Error();
+      if (!res.ok) throw new Error('request_failed');
       status.textContent = form.dataset.statusSuccess || '✓';
       form.reset();
       setTimeout(() => modal.classList.remove('open'), 1200);
     } catch (err) {
-      status.textContent = form.dataset.statusSuccess || '✓'; // без реального сервера считаем успехом
+      status.textContent = form.dataset.statusError || 'Error';
-      form.reset();
-      setTimeout(() => modal.classList.remove('open'), 1200);
     }
   });
 }

en/index.html

@@ -427,7 +427,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Contact form</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Sent ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Sent ✓" data-status-error="Could not send. Please try again.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Name</span>
         <input type="text" name="name" required="">

en/terminal/index.html

@@ -276,7 +276,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Contact form</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Sent ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Sent ✓" data-status-error="Could not send. Please try again.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Name</span>
         <input type="text" name="name" required="">

index.html

@@ -427,7 +427,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Форма для связи</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Отправлено ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Отправлено ✓" data-status-error="Не удалось отправить. Попробуйте ещё раз.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Имя</span>
         <input type="text" name="name" required="">

scripts/build.py

@@ -314,6 +314,10 @@ def build_page(locale: dict, page: dict, translations: dict, template: str) -> s
         "{{FORM_STATUS_SUCCESS}}",
         esc_attr(t(translations, locale["dict"], "form.statusSuccess")),
     )
+    html = html.replace(
+        "{{FORM_STATUS_ERROR}}",
+        esc_attr(t(translations, locale["dict"], "form.statusError")),
+    )
 
     html = fill_i18n(html, translations, locale["dict"])
     html = localize_urls(html, prefix)

src/index.html

@@ -332,7 +332,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3 data-i18n="form.title"></h3>
 
-    <form id="contactForm" data-status-loading="{{FORM_STATUS_LOADING}}" data-status-success="{{FORM_STATUS_SUCCESS}}">
+    <form id="contactForm" data-status-loading="{{FORM_STATUS_LOADING}}" data-status-success="{{FORM_STATUS_SUCCESS}}" data-status-error="{{FORM_STATUS_ERROR}}">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span data-i18n="form.nameLabel"></span>
         <input type="text" name="name" required="">

src/terminal.html

@@ -181,7 +181,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3 data-i18n="form.title"></h3>
 
-    <form id="contactForm" data-status-loading="{{FORM_STATUS_LOADING}}" data-status-success="{{FORM_STATUS_SUCCESS}}">
+    <form id="contactForm" data-status-loading="{{FORM_STATUS_LOADING}}" data-status-success="{{FORM_STATUS_SUCCESS}}" data-status-error="{{FORM_STATUS_ERROR}}">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span data-i18n="form.nameLabel"></span>
         <input type="text" name="name" required="">

src/translations.json

@@ -123,6 +123,7 @@
     "form.submit": "Отправить",
     "form.statusLoading": "...",
     "form.statusSuccess": "Отправлено ✓",
+    "form.statusError": "Не удалось отправить. Попробуйте ещё раз.",
     "a11y.toggleTheme": "Переключить тему",
     "a11y.sections": "Разделы",
     "terminal.meta.title": "428th Terminal — автотрейдинг по TradingView сигналам",
@@ -289,6 +290,7 @@
     "form.submit": "Надіслати",
     "form.statusLoading": "...",
     "form.statusSuccess": "Надіслано ✓",
+    "form.statusError": "Не вдалося надіслати. Спробуйте ще раз.",
     "a11y.toggleTheme": "Перемкнути тему",
     "a11y.sections": "Розділи",
     "terminal.meta.title": "428th Terminal — автотрейдинг за сигналами TradingView",
@@ -455,6 +457,7 @@
     "form.submit": "Send",
     "form.statusLoading": "...",
     "form.statusSuccess": "Sent ✓",
+    "form.statusError": "Could not send. Please try again.",
     "a11y.toggleTheme": "Toggle theme",
     "a11y.sections": "Sections",
     "terminal.meta.title": "428th Terminal — auto trading via TradingView signals",

styles.css

@@ -440,6 +440,10 @@ a:hover{opacity:0.7;}
   font-size:22px; cursor:pointer; color:var(--text);
 }
 #contactForm label{display:block; margin-bottom:20px; font-size:13px; color:var(--text);}
+#contactForm .hp-field{
+  position:absolute; left:-10000px; top:auto; width:1px; height:1px;
+  overflow:hidden; opacity:0; pointer-events:none;
+}
 #contactForm input, #contactForm textarea{
   width:100%; margin-top:6px; padding:10px; border:1px solid var(--border);
   border-radius:4px; background:transparent; color:var(--heading); font-family:inherit;

terminal/index.html

@@ -276,7 +276,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Форма для связи</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Отправлено ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Отправлено ✓" data-status-error="Не удалось отправить. Попробуйте ещё раз.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Имя</span>
         <input type="text" name="name" required="">

ua/index.html

@@ -427,7 +427,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Форма для зв'язку</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Надіслано ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Надіслано ✓" data-status-error="Не вдалося надіслати. Спробуйте ще раз.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Ім'я</span>
         <input type="text" name="name" required="">

ua/terminal/index.html

@@ -276,7 +276,12 @@
     <button class="modal-close" id="closeContactForm">×</button>
     <h3>Форма для зв'язку</h3>
 
-    <form id="contactForm" data-status-loading="..." data-status-success="Надіслано ✓">
+    <form id="contactForm" data-status-loading="..." data-status-success="Надіслано ✓" data-status-error="Не вдалося надіслати. Спробуйте ще раз.">
+      <label class="hp-field" aria-hidden="true">
+        <span>Website</span>
+        <input type="text" name="website" tabindex="-1" autocomplete="off">
+      </label>
+
       <label>
         <span>Ім'я</span>
         <input type="text" name="name" required="">