feat: pdf generation using product barcode images

barcodes/generator/default_generator.py

@@ -1,20 +1,20 @@
 from io import BytesIO
-from typing import List, Dict
+from typing import List
 
 from barcodes.attributes import AttributeWriterFactory
 from barcodes.generator.base import BaseBarcodeGenerator
 from barcodes.pdf import PDFGenerator
-from models import Product, BarcodeTemplate
+from barcodes.types import BarcodeData, PdfBarcodeGenData, PdfBarcodeImageGenData
-from schemas.barcode import PdfBarcodeGenData
 
 
 class DefaultBarcodeGenerator(BaseBarcodeGenerator):
-    def generate(self, barcodes_data: List[Dict[str, str | Product | BarcodeTemplate | int]]) -> BytesIO:
+    def generate(self, barcodes_data: List[BarcodeData | PdfBarcodeImageGenData]) -> BytesIO:
         pdf_generator = PDFGenerator()
 
-        pdf_barcodes_gen_data: List[PdfBarcodeGenData] = []
+        pdf_barcodes_gen_data: List[PdfBarcodeGenData | PdfBarcodeImageGenData] = []
 
         for barcode_data in barcodes_data:
+            if "barcode" in barcode_data:
                 attributes = {}
                 for attribute in barcode_data["template"].attributes:
                     attribute_getter = AttributeWriterFactory.get_writer(attribute.key)
@@ -32,12 +32,13 @@ class DefaultBarcodeGenerator(BaseBarcodeGenerator):
                     attributes[additional_attribute.name] = value
                 barcode_text = '<br/>'.join([f'{key}: {value}' for key, value in attributes.items()])
 
-            pdf_barcodes_gen_data.append(
+                pdf_barcodes_gen_data.append({
-                PdfBarcodeGenData(
+                    "barcode_value": barcode_data["barcode"],
-                    barcode_value=barcode_data["barcode"],
+                    "text": barcode_text,
-                    text=barcode_text,
+                    "num_duplicates": barcode_data["num_duplicates"]
-                    num_duplicates=barcode_data["quantity"]
+                })
-                )
+            else:
-            )
+                pdf_barcodes_gen_data.append(barcode_data)
 
         return pdf_generator.generate(pdf_barcodes_gen_data)
+

barcodes/images_uploader/base.py

@@ -9,6 +9,10 @@ class BaseImagesUploader:
     def get_url(self, filename: str) -> bytes:
         pass
 
+    @abstractmethod
+    def get_abs_path(self, filename: str) -> bytes:
+        pass
+
     @abstractmethod
     def delete(self, filename: str):
         pass

barcodes/images_uploader/images_uploader.py

@@ -20,6 +20,10 @@ class BarcodeImagesUploader(BaseImagesUploader):
         file_location = self.relative_path / filename
         return f"{API_ROOT}/{file_location}"
 
+    def get_abs_path(self, filename: str) -> str:
+        file_location = self.storage_path / filename
+        return file_location
+
     def delete(self, filename: str):
         file_location = self.storage_path / filename
         if file_location.exists():

barcodes/pdf/generator.py

@@ -10,8 +10,9 @@ from reportlab.pdfbase.ttfonts import TTFont
 from reportlab.pdfgen import canvas
 from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak
 
+from barcodes.pdf.pdf_maker import PdfMaker
+from barcodes.types import PdfBarcodeImageGenData, PdfBarcodeGenData
 from constants import APP_PATH
-from schemas.barcode import PdfBarcodeGenData
 
 
 class PDFGenerator:
@@ -102,19 +103,12 @@ class PDFGenerator:
             bottomMargin=1 * mm
         )
 
-    def generate(self, barcodes_data: List[PdfBarcodeGenData]) -> BytesIO:
+    def _generate_for_one_product(self, barcode_data: PdfBarcodeGenData) -> BytesIO:
         buffer = BytesIO()
-
-        # Создаем документ с указанным размером страницы
         doc = self._create_doc(buffer)
 
-        # Список элементов для добавления в документ
-        elements = []
-        product_barcode_canvases = []
-
-        for barcode_data in barcodes_data:
         # Создаем абзац с новым стилем
-            paragraph = Paragraph(barcode_data.text, self.small_style)
+        paragraph = Paragraph(barcode_data['text'], self.small_style)
 
         # Получаем ширину и высоту абзаца
         paragraph_width, paragraph_height = paragraph.wrap(self.page_width - 2 * mm, self.page_height)
@@ -128,64 +122,75 @@ class PDFGenerator:
         available_width = self.page_width - 2 * mm  # Учитываем поля
 
         # Приблизительное количество элементов в штрихкоде Code 128 для средней длины
-            num_elements = 11 * len(barcode_data.barcode_value)  # Примерная оценка: 11 элементов на символ
+        num_elements = 11 * len(barcode_data['barcode_value'])  # Примерная оценка: 11 элементов на символ
 
         # Рассчитываем ширину штриха
         bar_width = available_width / num_elements
         barcode = code128.Code128(
-                barcode_data.barcode_value,
+            barcode_data['barcode_value'],
             barWidth=bar_width,
             barHeight=barcode_height,
             humanReadable=True
         )
-            product_barcode_canvases.append(barcode)
 
         # Добавление штрихкодов в список элементов документа
-            for _ in range(barcode_data.num_duplicates):
+        elements = []
+        for _ in range(barcode_data['num_duplicates']):
             elements.append(paragraph)
             elements.append(Spacer(1, space_between_text_and_barcode))  # Отступ между текстом и штрихкодом
             elements.append(PageBreak())
 
-            # Добавление спейсеров
-            for _ in range(self.number_of_spacing_pages):
-                elements.append(PageBreak())
-
-        # Удалить последние спейсеры
-        elements = elements[:-2]
-
-        product_counter, product_barcodes_counter = 0, 0
-
         # Функция для отрисовки штрихкода на canvas
         def add_barcode(canvas, doc):
-            nonlocal product_barcodes_counter, product_counter
+            barcode_width = barcode.width
-
-            barcode_canvas = product_barcode_canvases[product_counter]
-
-            product_barcodes_counter += 1
-
-            # Если данная страница это спейсер, то оставить пустой
-            num_duplicates = barcodes_data[product_counter].num_duplicates
-            if product_barcodes_counter > num_duplicates:
-                if product_barcodes_counter >= num_duplicates + self.number_of_spacing_pages:
-                    product_barcodes_counter = 0
-                    product_counter += 1
-                return
-
-            # Отрисовка штрихкода
-            barcode_width = barcode_canvas.width
             barcode_x = (self.page_width - barcode_width) / 2  # Центрируем штрихкод
             barcode_y = human_readable_height + 2 * mm  # Размещаем штрихкод снизу с учетом отступа
-            barcode_canvas.drawOn(canvas, barcode_x, barcode_y)
+            barcode.drawOn(canvas, barcode_x, barcode_y)
 
         # Создаем документ
-        doc.build(elements[:-1], onFirstPage=add_barcode, onLaterPages=add_barcode)  # Убираем последний PageBreak
+        doc.build(elements, onFirstPage=add_barcode, onLaterPages=add_barcode)  # Убираем последний PageBreak
 
         buffer.seek(0)
         return buffer
 
+    def _generate_for_one_product_using_img(self, barcode_data: PdfBarcodeImageGenData) -> BytesIO:
+        with open(barcode_data["barcode_image_url"], 'rb') as pdf_file:
+            pdf_bytes = pdf_file.read()
+
+        pdf_maker = PdfMaker((self.page_width, self.page_height))
+        for _ in range(barcode_data['num_duplicates']):
+            pdf_maker.add_pdfs(BytesIO(pdf_bytes))
+
+        return pdf_maker.get_bytes()
+
+    def _generate_spacers(self) -> BytesIO:
+        buffer = BytesIO()
+        doc = self._create_doc(buffer)
+        elements = []
+        for _ in range(self.number_of_spacing_pages):
+            elements.append(PageBreak())
+        doc.build(elements)
+        buffer.seek(0)
+        return buffer
+
+    def generate(self, barcodes_data: List[PdfBarcodeGenData | PdfBarcodeImageGenData]) -> BytesIO:
+        pdf_maker = PdfMaker((self.page_width, self.page_height))
+
+        pdf_files: list[BytesIO] = []
+
+        for barcode_data in barcodes_data:
+            if "barcode_value" in barcode_data:
+                pdf_files.append(self._generate_for_one_product(barcode_data))
+            else:
+                pdf_files.append(self._generate_for_one_product_using_img(barcode_data))
+            pdf_files.append(self._generate_spacers())
+
+        for file in pdf_files[:-1]:
+            pdf_maker.add_pdfs(file)
+
+        return pdf_maker.get_bytes()
+
     def generate_barcode_image(self, barcode_image_url: str, path_to_save_pdf: str):
-        print(type(path_to_save_pdf))
-        print(path_to_save_pdf)
         c = canvas.Canvas(path_to_save_pdf, pagesize=(self.page_width, self.page_height))
         c.drawImage(barcode_image_url, 0, 0, width=self.page_width, height=self.page_height)
         c.save()

barcodes/pdf/pdf_maker.py

@@ -0,0 +1,38 @@
+from io import BytesIO
+
+from fpdf import FPDF
+import pdfrw
+
+class PdfMaker:
+    def __init__(self, size: tuple):
+        self.size = size
+
+        self.writer = pdfrw.PdfWriter()
+
+    def clear(self):
+        del self.writer
+        self.writer = pdfrw.PdfWriter()
+
+    def add_image(self, image_data):
+        size = self.size
+
+        fpdf = FPDF(format=size, unit="pt")
+        width, height = self.size
+        fpdf.add_page()
+        fpdf.image(image_data, 0, 0, width, height)
+        fpdf_reader: pdfrw.PdfReader = pdfrw.PdfReader(fdata=bytes(fpdf.output()))
+        self.writer.addpage(fpdf_reader.getPage(0))
+
+    def add_pdf(self, pdf_data: BytesIO):
+        pdf_reader = pdfrw.PdfReader(fdata=bytes(pdf_data.read()))
+        self.writer.addpage(pdf_reader.getPage(0))
+
+    def add_pdfs(self, pdf_data: BytesIO):
+        pdf_reader = pdfrw.PdfReader(fdata=bytes(pdf_data.read()))
+        self.writer.addpages(pdf_reader.readpages(pdf_reader.Root))
+
+    def get_bytes(self):
+        result_io = BytesIO()
+        self.writer.write(result_io)
+        result_io.seek(0)
+        return result_io

barcodes/types.py

@@ -0,0 +1,21 @@
+from typing import TypedDict
+
+from models import BarcodeTemplate, Product
+
+
+class BarcodeData(TypedDict):
+    barcode: str
+    template: BarcodeTemplate
+    product: Product
+    num_duplicates: int
+
+
+class PdfBarcodeGenData(TypedDict):
+    barcode_value: str
+    text: str
+    num_duplicates: int
+
+
+class PdfBarcodeImageGenData(TypedDict):
+    num_duplicates: int
+    barcode_image_url: str

requirements.txt

@@ -30,3 +30,5 @@ aioshutil
 reportlab
 weasyprint
 number_to_string
+pdfrw
+fpdf

schemas/barcode.py

@@ -47,12 +47,6 @@ class BarcodeSchema(BaseSchema):
     additional_field: str | None = None
 
 
-class PdfBarcodeGenData(BaseSchema):
-    barcode_value: str
-    text: str
-    num_duplicates: int = 1
-
-
 # endregion
 
 # region Requests

services/barcode.py

@@ -6,6 +6,7 @@ from sqlalchemy.orm import selectinload, joinedload
 
 from barcodes.attributes import AttributeWriterFactory
 from barcodes.generator.default_generator import DefaultBarcodeGenerator
+from barcodes.images_uploader import BarcodeImagesUploader
 from models import BarcodeTemplate, BarcodeTemplateAttribute, barcode_template_attribute_link, Product, \
     BarcodeTemplateAdditionalField, BarcodeTemplateSize, Deal, DealProduct
 from schemas.barcode import *
@@ -89,15 +90,25 @@ class BarcodeService(BaseService):
         product: Product = query.scalar()
         if not product:
             raise ValueError('Товар не найден')
-        barcode_template = await self._get_barcode_template(request, product)
-        default_generator = DefaultBarcodeGenerator()
         filename = f'{product.id}_barcode.pdf'
+        default_generator = DefaultBarcodeGenerator()
+
+        if product.barcode_image:
+            uploader = BarcodeImagesUploader()
+            pdf_buffer = default_generator.generate(
+                [{
+                    "barcode_image_url": uploader.get_abs_path(product.barcode_image.filename),
+                    "num_duplicates": request.quantity
+                }]
+            )
+        else:
+            barcode_template = await self._get_barcode_template(request, product)
             pdf_buffer = default_generator.generate(
                 [{
                     "barcode": request.barcode,
                     "product": product,
                     "template": barcode_template,
-                "quantity": request.quantity
+                    "num_duplicates": request.quantity
                 }]
             )
         return filename, pdf_buffer
@@ -107,7 +118,7 @@ class BarcodeService(BaseService):
             select(Deal)
             .options(
                 selectinload(Deal.products).joinedload(DealProduct.product).selectinload(Product.client),
-                selectinload(Deal.products).joinedload(DealProduct.product).joinedload(Product.barcodes)
+                selectinload(Deal.products).joinedload(DealProduct.product).joinedload(Product.barcodes),
             )
             .filter(Deal.id == request.deal_id)
         )
@@ -116,8 +127,15 @@ class BarcodeService(BaseService):
         if not deal:
             raise ValueError('Сделка не найдена')
 
+        uploader = BarcodeImagesUploader()
         barcodes_data: List[Dict[str, str | Product | BarcodeTemplate | int]] = []
         for deal_product in deal.products:
+            if deal_product.product.barcode_image:
+                barcodes_data.append({
+                    "barcode_image_url": uploader.get_abs_path(deal_product.product.barcode_image.filename),
+                    "num_duplicates": deal_product.quantity
+                })
+            else:
                 product_request = GetProductBarcodeRequest(
                     product_id=deal_product.product_id,
                     barcode="",
@@ -128,7 +146,7 @@ class BarcodeService(BaseService):
                     "barcode": deal_product.product.barcodes[0].barcode,
                     "product": deal_product.product,
                     "template": barcode_template,
-                "quantity": deal_product.quantity
+                    "num_duplicates": deal_product.quantity
                 })
 
         default_generator = DefaultBarcodeGenerator()