refac: pdf generation

backend/apps/web/routers/utils.py

-from fastapi import APIRouter, UploadFile, File, BackgroundTasks
+from fastapi import APIRouter, UploadFile, File, Response
 from fastapi import Depends, HTTPException, status
 from starlette.responses import StreamingResponse, FileResponse
-
-
 from pydantic import BaseModel
 
 
+from fpdf import FPDF
 import markdown
-import requests
-import os
-import aiohttp
-import json
 
 
 from utils.utils import get_admin_user
@@ -18,7 +13,7 @@ from utils.misc import calculate_sha256, get_gravatar_url
 
 from config import OLLAMA_BASE_URLS, DATA_DIR, UPLOAD_DIR
 from constants import ERROR_MESSAGES
-
+from typing import List
 
 router = APIRouter()
 
@@ -41,6 +36,59 @@ async def get_html_from_markdown(
     return {"html": markdown.markdown(form_data.md)}
 
 
+class ChatForm(BaseModel):
+    title: str
+    messages: List[dict]
+
+
+@router.post("/pdf")
+async def download_chat_as_pdf(
+    form_data: ChatForm,
+):
+    pdf = FPDF()
+    pdf.add_page()
+
+    STATIC_DIR = "./static"
+    FONTS_DIR = f"{STATIC_DIR}/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.set_font("NotoSans", size=12)
+    pdf.set_fallback_fonts(["NotoSansKR", "NotoSansJP"])
+
+    pdf.set_auto_page_break(auto=True, margin=15)
+
+    # Adjust the effective page width for multi_cell
+    effective_page_width = (
+        pdf.w - 2 * pdf.l_margin - 10
+    )  # Subtracted an additional 10 for extra padding
+
+    # Add chat messages
+    for message in form_data.messages:
+        role = message["role"]
+        content = message["content"]
+        pdf.set_font("NotoSans", "B", size=12)  # Bold for the role
+        pdf.multi_cell(effective_page_width, 10, f"{role.upper()}", 0, "L")
+        pdf.ln(1)  # Extra space between messages
+
+        pdf.set_font("NotoSans", size=10)  # Regular for content
+        pdf.multi_cell(effective_page_width, 10, content, 0, "L")
+        pdf.ln(1)  # Extra space between messages
+
+    # Save the pdf with name .pdf
+    pdf_bytes = pdf.output()
+
+    return Response(
+        content=bytes(pdf_bytes),
+        media_type="application/pdf",
+        headers={"Content-Disposition": f"attachment;filename=chat.pdf"},
+    )
+
+
 @router.get("/db/download")
 async def download_db(user=Depends(get_admin_user)):
 

backend/requirements.txt

@@ -42,6 +42,8 @@ xlrd
 opencv-python-headless
 rapidocr-onnxruntime
 
+fpdf2
+
 faster-whisper
 
 PyJWT

src/lib/apis/utils/index.ts

@@ -22,6 +22,32 @@ export const getGravatarUrl = async (email: string) => {
 	return res;
 };
 
+export const downloadChatAsPDF = async (chat: object) => {
+	let error = null;
+
+	const blob = await fetch(`${WEBUI_API_BASE_URL}/utils/pdf`, {
+		method: 'POST',
+		headers: {
+			'Content-Type': 'application/json'
+		},
+		body: JSON.stringify({
+			title: chat.title,
+			messages: chat.messages
+		})
+	})
+		.then(async (res) => {
+			if (!res.ok) throw await res.json();
+			return res.blob();
+		})
+		.catch((err) => {
+			console.log(err);
+			error = err;
+			return null;
+		});
+
+	return blob;
+};
+
 export const getHTMLFromMarkdown = async (md: string) => {
 	let error = null;
 

src/lib/components/layout/Navbar/Menu.svelte

@@ -11,6 +11,8 @@
 
 	import Dropdown from '$lib/components/common/Dropdown.svelte';
 	import Tags from '$lib/components/common/Tags.svelte';
+	import { WEBUI_BASE_URL } from '$lib/constants';
+	import { downloadChatAsPDF } from '$lib/apis/utils';
 
 	export let shareEnabled: boolean = false;
 	export let shareHandler: Function;
@@ -25,7 +27,7 @@
 
 	export let onClose: Function = () => {};
 
-	const downloadChatAsTxt = async () => {
+	const downloadTxt = async () => {
 		const _chat = chat.chat;
 		console.log('download', chat);
 
@@ -40,54 +42,29 @@
 		saveAs(blob, `chat-${_chat.title}.txt`);
 	};
 
-	const downloadChatAsPdf = async () => {
+	const downloadPdf = async () => {
 		const _chat = chat.chat;
 		console.log('download', chat);
 
-		const doc = new jsPDF();
+		const blob = await downloadChatAsPDF(_chat);
 
-		// Initialize y-coordinate for text placement
-		let yPos = 10;
-		const pageHeight = doc.internal.pageSize.height;
+		// Create a URL for the blob
+		const url = window.URL.createObjectURL(blob);
 
-		// Function to check if new text exceeds the current page height
-		function checkAndAddNewPage() {
-			if (yPos > pageHeight - 10) {
-				doc.addPage();
-				yPos = 10; // Reset yPos for the new page
-			}
-		}
-
-		// Function to add text with specific style
-		function addStyledText(text, isTitle = false) {
-			// Set font style and size based on the parameters
-			doc.setFont('helvetica', isTitle ? 'bold' : 'normal');
-			doc.setFontSize(isTitle ? 12 : 10);
-
-			const textMargin = 7;
-
-			// Split text into lines to ensure it fits within the page width
-			const lines = doc.splitTextToSize(text, 180); // Adjust the width as needed
+		// Create a link element to trigger the download
+		const a = document.createElement('a');
+		a.href = url;
+		a.download = `chat-${_chat.title}.pdf`;
 
-			lines.forEach((line) => {
-				checkAndAddNewPage(); // Check if we need a new page before adding more text
-				doc.text(line, 10, yPos);
-				yPos += textMargin; // Increment yPos for the next line
-			});
+		// Append the link to the body and click it programmatically
+		document.body.appendChild(a);
+		a.click();
 
-			// Add extra space after a block of text
-			yPos += 2;
-		}
-
-		_chat.messages.forEach((message, i) => {
-			// Add user text in bold
-			doc.setFont('helvetica', 'normal', 'bold');
-
-			addStyledText(message.role.toUpperCase(), { isTitle: true });
-			addStyledText(message.content);
-		});
+		// Remove the link from the body
+		document.body.removeChild(a);
 
-		doc.save(`chat-${_chat.title}.pdf`);
+		// Revoke the URL to release memory
+		window.URL.revokeObjectURL(url);
 	};
 </script>
 
@@ -193,7 +170,7 @@
 						<DropdownMenu.Item
 							class="flex gap-2 items-center px-3 py-2 text-sm  cursor-pointer dark:hover:bg-gray-850 rounded-md"
 							on:click={() => {
-								downloadChatAsTxt();
+								downloadTxt();
 							}}
 						>
 							<div class="flex items-center line-clamp-1">Plain text (.txt)</div>
@@ -202,7 +179,7 @@
 						<DropdownMenu.Item
 							class="flex gap-2 items-center px-3 py-2 text-sm  cursor-pointer dark:hover:bg-gray-850 rounded-md"
 							on:click={() => {
-								downloadChatAsPdf();
+								downloadPdf();
 							}}
 						>
 							<div class="flex items-center line-clamp-1">PDF document (.pdf)</div>