feat: calculate 15% limit for book(s), blocking submission if over the limit

app/main.py

@@ -4,8 +4,9 @@ import smtplib
 from email.mime.text import MIMEText
 from xml.etree.ElementTree import Element, SubElement, tostring
 
+from bibapi import catalogue
 from fastapi import FastAPI, Form, HTTPException, Request, status
-from fastapi.responses import HTMLResponse, RedirectResponse
+from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 
@@ -15,6 +16,9 @@ templates = Jinja2Templates(directory="app/templates")
 # Serve static files (CSS, images)
 app.mount("/static", StaticFiles(directory="app/static"), name="static")
 
+# Initialize catalogue for signature validation
+cat = catalogue.Catalogue()
+
 # add somewhere near the top-level constants
 EMAIL_REGEX = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")
 
@@ -44,6 +48,39 @@ async def elsa_form(request: Request):
     return templates.TemplateResponse("elsa_mono_form.html", {"request": request})
 
 
+@app.get("/api/validate-signature")
+async def validate_signature(signature: str):
+    """Validate a book signature and return total pages"""
+    try:
+        book_result = cat.get_book_with_data(signature)
+        if book_result and hasattr(book_result, "pages") and book_result.pages:
+            # Try to extract numeric page count
+            pages_str = str(book_result.pages)
+            # Extract first number from pages string (e.g., "245 S." -> 245)
+            match = re.search(r"(\d+)", pages_str)
+            if match:
+                total_pages = int(match.group(1))
+                return JSONResponse(
+                    {"valid": True, "total_pages": total_pages, "signature": signature}
+                )
+
+        return JSONResponse(
+            {
+                "valid": False,
+                "error": "Signatur nicht gefunden oder keine Seitenzahl verfügbar",
+                "signature": signature,
+            }
+        )
+    except Exception as e:
+        return JSONResponse(
+            {
+                "valid": False,
+                "error": f"Fehler bei der Validierung: {str(e)}",
+                "signature": signature,
+            }
+        )
+
+
 @app.post("/submit")
 async def handle_form(
     request: Request,