From 910157e66d70838852d0da1cd1e65520b8db592b Mon Sep 17 00:00:00 2001
From: Eduard Izmalkov <uvshol@gmail.com>
Date: Tue, 24 Oct 2023 23:28:58 +0300
Subject: [PATCH] feat(Document): generate pdf-version of document

BREAKING CHANGE:
---
 backend/Dockerfile      |  6 ++++++
 backend/api/v1/views.py | 38 +++++++++++++++++++++++++++++++++++---
 backend/commands/app.sh |  1 +
 nginx/nginx.conf        |  1 +
 4 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/backend/Dockerfile b/backend/Dockerfile
index 2f45186..6e89c4c 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,5 +1,11 @@
 FROM python:3.9
 
+RUN echo "deb http://deb.debian.org/debian bookworm main contrib" | tee /etc/apt/sources.list
+RUN  apt-get update
+RUN apt-get install -y --no-install-recommends libreoffice-writer
+RUN apt-get install -y libreoffice-java-common
+RUN apt-get install -y ttf-mscorefonts-installer
+
 WORKDIR /app
 
 COPY requirements.txt .
diff --git a/backend/api/v1/views.py b/backend/api/v1/views.py
index 9db1a82..d84e38c 100644
--- a/backend/api/v1/views.py
+++ b/backend/api/v1/views.py
@@ -1,3 +1,8 @@
+from io import BytesIO
+import subprocess
+import tempfile
+from pathlib import Path
+
 from django.http import FileResponse
 from django.shortcuts import get_object_or_404
 from django_filters.rest_framework import DjangoFilterBackend
@@ -49,7 +54,7 @@ class CategoryViewSet(viewsets.ModelViewSet):
     permissions_classes = (AllowAny,)
 
 
-def send_file(filestream, filename: str):
+def send_file(filestream, filename: str, as_attachment: bool = True):
     """Функция подготовки открытого двоичного файла к отправке."""
 
     response = FileResponse(
@@ -205,8 +210,7 @@ def history_documents(self, request):
         url_path=r"download_document",
     )
     def download_document(self, request, pk=None):
-        """Скачивание готового документа"""
-
+        """Скачивание готового документа."""
         document = get_object_or_404(Document, id=pk)
         context = dict()
         for docfield in FieldToDocument.objects.filter(document=document):
@@ -222,6 +226,34 @@ def download_document(self, request, pk=None):
         response = send_file(buffer, f"{document.template.name}.docx")
         return response
 
+    @action(
+        detail=True,
+        permissions_classes=[IsAuthenticated],
+        url_path="download_pdf",
+    )
+    def download_pdf(self, request, pk=None):
+        """Генерация и выдача на скачивание pdf-файла."""
+        with tempfile.NamedTemporaryFile() as output:
+            outfile = Path(output.name).resolve()
+            outfile.write_bytes(
+                b''.join(self.download_document(request, pk).streaming_content)
+            )
+            subprocess.run([
+                "soffice",
+                 "--headless",
+                 "--invisible",
+                 "--nologo",
+                 "--convert-to",
+                 "pdf",
+                 "--outdir",
+                 outfile.parent,
+                 outfile.absolute(),
+            ])
+        newfile = outfile.with_suffix(".pdf")
+        buffer = BytesIO(newfile.read_bytes())
+        response = send_file(buffer, newfile.name)
+        return response
+            
 
 class DocumentFieldViewSet(viewsets.ModelViewSet):
     """Поле шаблона."""
diff --git a/backend/commands/app.sh b/backend/commands/app.sh
index 2578818..b94a237 100644
--- a/backend/commands/app.sh
+++ b/backend/commands/app.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+
 python manage.py makemigrations
 
 python manage.py migrate
diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 93500d0..654ef5e 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -34,6 +34,7 @@ server {
   location /swagger/ {
        proxy_set_header X-Forwarded-Protocol  $scheme;
        proxy_set_header Host $http_host;
+       proxy_set_header X-Forwarded-Host $server_name;
        proxy_pass http://backend:9000/swagger/;
   }