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| from datetime import datetime | |
| from io import BytesIO | |
| from pathlib import Path | |
| from typing import Dict, Any, List | |
| from markdown import markdown | |
| import site | |
| from fpdf import FPDF | |
| from open_webui.env import STATIC_DIR, FONTS_DIR | |
| from open_webui.apps.webui.models.chats import ChatTitleMessagesForm | |
| class PDFGenerator: | |
| """ | |
| Description: | |
| The `PDFGenerator` class is designed to create PDF documents from chat messages. | |
| The process involves transforming markdown content into HTML and then into a PDF format | |
| Attributes: | |
| - `form_data`: An instance of `ChatTitleMessagesForm` containing title and messages. | |
| """ | |
| def __init__(self, form_data: ChatTitleMessagesForm): | |
| self.html_body = None | |
| self.messages_html = None | |
| self.form_data = form_data | |
| self.css = Path(STATIC_DIR / "assets" / "pdf-style.css").read_text() | |
| def format_timestamp(self, timestamp: float) -> str: | |
| """Convert a UNIX timestamp to a formatted date string.""" | |
| try: | |
| date_time = datetime.fromtimestamp(timestamp) | |
| return date_time.strftime("%Y-%m-%d, %H:%M:%S") | |
| except (ValueError, TypeError) as e: | |
| # Log the error if necessary | |
| return "" | |
| def _build_html_message(self, message: Dict[str, Any]) -> str: | |
| """Build HTML for a single message.""" | |
| role = message.get("role", "user") | |
| content = message.get("content", "") | |
| timestamp = message.get("timestamp") | |
| model = message.get("model") if role == "assistant" else "" | |
| date_str = self.format_timestamp(timestamp) if timestamp else "" | |
| # extends pymdownx extension to convert markdown to html. | |
| # - https://facelessuser.github.io/pymdown-extensions/usage_notes/ | |
| html_content = markdown(content, extensions=["pymdownx.extra"]) | |
| html_message = f""" | |
| <div> {date_str} </div> | |
| <div class="message"> | |
| <div> | |
| <h2> | |
| <strong>{role.title()}</strong> | |
| <span style="font-size: 12px; color: #888;">{model}</span> | |
| </h2> | |
| </div> | |
| <pre class="markdown-section"> | |
| {content} | |
| </pre> | |
| </div> | |
| """ | |
| return html_message | |
| def _generate_html_body(self) -> str: | |
| """Generate the full HTML body for the PDF.""" | |
| return f""" | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <div class="text-center"> | |
| <h1>{self.form_data.title}</h1> | |
| </div> | |
| <div> | |
| {self.messages_html} | |
| </div> | |
| </div> | |
| </body> | |
| </html> | |
| """ | |
| def generate_chat_pdf(self) -> bytes: | |
| """ | |
| Generate a PDF from chat messages. | |
| """ | |
| try: | |
| global FONTS_DIR | |
| pdf = FPDF() | |
| pdf.add_page() | |
| # When running using `pip install` the static directory is in the site packages. | |
| if not FONTS_DIR.exists(): | |
| FONTS_DIR = Path(site.getsitepackages()[0]) / "static/fonts" | |
| # When running using `pip install -e .` the static directory is in the site packages. | |
| # This path only works if `open-webui serve` is run from the root of this project. | |
| if not FONTS_DIR.exists(): | |
| FONTS_DIR = Path("./backend/static/fonts") | |
| pdf.add_font("NotoSans", "", f"{FONTS_DIR}/NotoSans-Regular.ttf") | |
| pdf.add_font("NotoSans", "b", f"{FONTS_DIR}/NotoSans-Bold.ttf") | |
| pdf.add_font("NotoSans", "i", f"{FONTS_DIR}/NotoSans-Italic.ttf") | |
| pdf.add_font("NotoSansKR", "", f"{FONTS_DIR}/NotoSansKR-Regular.ttf") | |
| pdf.add_font("NotoSansJP", "", f"{FONTS_DIR}/NotoSansJP-Regular.ttf") | |
| pdf.add_font("NotoSansSC", "", f"{FONTS_DIR}/NotoSansSC-Regular.ttf") | |
| pdf.set_font("NotoSans", size=12) | |
| pdf.set_fallback_fonts(["NotoSansKR", "NotoSansJP", "NotoSansSC"]) | |
| pdf.set_auto_page_break(auto=True, margin=15) | |
| # Build HTML messages | |
| messages_html_list: List[str] = [ | |
| self._build_html_message(msg) for msg in self.form_data.messages | |
| ] | |
| self.messages_html = "<div>" + "".join(messages_html_list) + "</div>" | |
| # Generate full HTML body | |
| self.html_body = self._generate_html_body() | |
| pdf.write_html(self.html_body) | |
| # Save the pdf with name .pdf | |
| pdf_bytes = pdf.output() | |
| return bytes(pdf_bytes) | |
| except Exception as e: | |
| raise e | |