feat: product barcode pdf resize

barcodes/images_uploader/base.py

@@ -1,6 +1,5 @@
 from abc import abstractmethod
-
+from typing import BinaryIO
-from fastapi import UploadFile
 
 
 class BaseImagesUploader:
@@ -18,5 +17,5 @@ class BaseImagesUploader:
         pass
 
     @abstractmethod
-    async def upload(self, upload_file: UploadFile) -> str:
+    async def upload(self, file: BinaryIO, filename: str) -> str:
         pass

barcodes/images_uploader/images_uploader.py

@@ -1,11 +1,10 @@
 from pathlib import Path
+from typing import BinaryIO
 from uuid import uuid4
 
 from aioshutil import copyfileobj
-from fastapi import UploadFile
 
 from barcodes.images_uploader.base import BaseImagesUploader
-from barcodes.pdf import PDFGenerator
 from constants import APP_PATH, API_ROOT
 
 
@@ -29,10 +28,10 @@ class BarcodeImagesUploader(BaseImagesUploader):
         if file_location.exists():
             file_location.unlink()
 
-    async def upload(self, upload_file: UploadFile) -> str:
+    async def upload(self, file: BinaryIO, filename: str) -> str:
-        filename = str(uuid4()) + '.' + upload_file.filename.split('.')[-1]
+        filename = str(uuid4()) + '.' + filename.split('.')[-1]
         file_location = self.storage_path / filename
         with open(file_location, 'wb') as buffer:
-            await copyfileobj(upload_file.file, buffer)
+            await copyfileobj(file, buffer)
 
         return filename

barcodes/pdf/pdf_maker.py

@@ -1,10 +1,8 @@
 from io import BytesIO
-from typing import BinaryIO
 
-from fpdf import FPDF
+import fitz
 import pdfrw
-from pdfrw import PdfReader
+from fpdf import FPDF
-from pdfrw.objects.pdfdict import PdfDict
 
 
 class PdfMaker:
@@ -42,27 +40,44 @@ class PdfMaker:
         return result_io
 
     @staticmethod
-    def check_is_correct_aspects_ratio(file: BinaryIO):
+    def _get_target_rect(page: fitz.Page, target_ratio: float) -> fitz.Rect:
-        pdf = PdfReader(file)
+        original_width, original_height = page.rect.width, page.rect.height
-        allowed_aspects_ratio = 1.45
-        page: PdfDict
 
-        try:
+        if original_width / original_height > target_ratio:
-            page: PdfDict = pdf.getPage(0)
+            # Image is wider than target aspect ratio
-        except IndexError:
+            new_width = original_width
-            raise Exception("Ошибка. В документе нет страниц.")
+            new_height = int(original_width / target_ratio)
+        else:
+            # Image is taller than target aspect ratio
+            new_height = original_height
+            new_width = int(new_height * target_ratio)
 
-        try:
+        return fitz.Rect(0, 0, new_width, new_height)
-            pdf.getPage(1)
-            raise Exception("Ошибка. В документе должна быть только одна страница.")
-        except IndexError:
-            pass
 
-        media_box = page.MediaBox
+    @staticmethod
-        width = float(media_box[2]) - float(media_box[0])
+    def resize_pdf_with_reportlab(input_pdf_bytesio: BytesIO) -> BytesIO:
-        height = float(media_box[3]) - float(media_box[1])
+        output_pdf = BytesIO()
 
-        aspect_ratio = width / height
+        pdf_document = fitz.open(stream=input_pdf_bytesio.getvalue(), filetype="pdf")
-        if abs(aspect_ratio - allowed_aspects_ratio) > 0.01:
+
-            raise Exception("Ошибка. Страница документа должна быть размером 58х40.")
+        if len(pdf_document) != 1:
-        file.seek(0)
+            raise Exception("Ошибка. В документе должна быть одна страница.")
+
+        page = pdf_document[0]
+        target_ratio = 29 / 20
+        actual_ratio = page.rect.width / page.rect.height
+
+        if abs(actual_ratio - target_ratio) < 0.1:
+            return input_pdf_bytesio
+
+        rect = PdfMaker._get_target_rect(page, target_ratio)
+        page.set_mediabox(rect)
+        page.set_cropbox(rect)
+        page.set_bleedbox(rect)
+        page.set_trimbox(rect)
+
+        pdf_document.save(output_pdf)
+        pdf_document.close()
+
+        output_pdf.seek(0)
+        return output_pdf

requirements.txt

@@ -33,3 +33,4 @@ weasyprint
 number_to_string
 pdfrw
 fpdf
+PyMuPDF

services/product.py

@@ -1,3 +1,4 @@
+from io import BytesIO
 from typing import Optional
 
 from fastapi import HTTPException, UploadFile
@@ -278,12 +279,13 @@ class ProductService(BaseService):
 
     async def upload_barcode_image(self, product_id: int, upload_file: UploadFile) -> ProductUploadBarcodeImageResponse:
         try:
-            PdfMaker.check_is_correct_aspects_ratio(upload_file.file)
             await self.get_model_by_id(product_id)
 
             uploader = BarcodeImagesUploader()
             await self.delete_model_barcode_image(uploader, product_id)
-            filename = await uploader.upload(upload_file)
+
+            file = PdfMaker.resize_pdf_with_reportlab(BytesIO(upload_file.file.read()))
+            filename = await uploader.upload(file, upload_file.filename)
             barcode_image_url = uploader.get_url(filename)
 
             product_barcode_image = ProductBarcodeImage(