feat: new barcodes

.gitignore

@@ -4,3 +4,5 @@
 .idea
 __pycache__
 /venv
+/test
+/test/*

barcodes/generator/default_generator.py

@@ -1,10 +1,26 @@
+from barcodes.attributes import AttributeWriterFactory
 from barcodes.generator.base import BaseBarcodeGenerator
+from barcodes.pdf import PDFGenerator
 from models import ProductBarcode, Product, BarcodeTemplate
 
 
 class DefaultBarcodeGenerator(BaseBarcodeGenerator):
     def generate(self,
-                 barcode: ProductBarcode,
+                 barcode: str,
                  product: Product,
-                 template: BarcodeTemplate):
-        pass
+                 template: BarcodeTemplate,
+                 quantity: int = 1):
+        pdf_generator = PDFGenerator()
+        attributes = {}
+        for attribute in template.attributes:
+            attribute_getter = AttributeWriterFactory.get_writer(attribute.key)
+            if not attribute_getter:
+                continue
+            value = attribute_getter.get_value(product)
+            if not value:
+                continue
+            attributes[attribute.name] = value
+        for additional_attribute in template.additional_attributes:
+            attributes[additional_attribute.name] = additional_attribute.value
+        barcode_text = '<br/>'.join([f'{key}: {value}' for key, value in attributes.items()])
+        return pdf_generator.generate(barcode, barcode_text, num_duplicates=quantity)

barcodes/pdf/__init__.py

@@ -0,0 +1 @@
+from .generator import PDFGenerator

barcodes/pdf/generator.py

@@ -0,0 +1,71 @@
+import os
+
+from io import BytesIO
+from reportlab.graphics.barcode import code128
+from reportlab.lib.pagesizes import mm
+from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
+from reportlab.pdfbase import pdfmetrics
+from reportlab.pdfbase.ttfonts import TTFont
+from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak
+
+from constants import APP_PATH
+
+
+class PDFGenerator:
+    def __init__(self):
+        ASSETS_FOLDER = os.path.join(APP_PATH, 'assets')
+        FONTS_FOLDER = os.path.join(ASSETS_FOLDER, 'fonts')
+        FONT_FILE_PATH = os.path.join(FONTS_FOLDER, 'DejaVuSans.ttf')
+        self.page_width = 58 * mm
+        self.page_height = 40 * mm
+
+        pdfmetrics.registerFont(TTFont('DejaVuSans', FONT_FILE_PATH))
+
+        # Get standard styles and create a new style with a smaller font size
+        styles = getSampleStyleSheet()
+        self.small_style = ParagraphStyle(
+            'Small',
+            parent=styles['Normal'],
+            fontName='DejaVuSans',  # Specify the new font
+            fontSize=6,
+            leading=7,
+            spaceAfter=2,
+            leftIndent=2,
+            rightIndent=2
+        )
+
+    def generate(self, barcode_value, text, num_duplicates=1):
+        buffer = BytesIO()
+
+        # Create document with specified page size
+        doc = SimpleDocTemplate(buffer,
+                                pagesize=(self.page_width, self.page_height),
+                                rightMargin=1 * mm,
+                                leftMargin=1 * mm,
+                                topMargin=1 * mm,
+                                bottomMargin=1 * mm)
+
+        # Create paragraph with new style
+        paragraph = Paragraph(text, self.small_style)
+
+        # Create barcode
+        barcode = code128.Code128(barcode_value, humanReadable=True)
+
+        # Function to draw barcode on canvas
+        def add_barcode(canvas, doc):
+            barcode_width = barcode.width
+            barcode_x = (self.page_width - barcode_width) / 2  # Center the barcode
+            barcode.drawOn(canvas, barcode_x, self.page_height - barcode.height - 5)
+
+        # Create list of elements to add to the document
+        elements = []
+        for _ in range(num_duplicates):
+            elements.append(Spacer(1, 8 * mm))
+            elements.append(paragraph)
+            elements.append(PageBreak())
+
+        # Build document
+        doc.build(elements[:-1], onFirstPage=add_barcode, onLaterPages=add_barcode)  # Remove the last PageBreak
+
+        buffer.seek(0)
+        return buffer

constants.py

@@ -1,3 +1,9 @@
+import os
+import sys
+
+APP_PATH = os.path.dirname(sys.executable) if getattr(sys, 'frozen', False) else os.path.dirname(__file__)
+
+
 allowed_telegram_ids = [
     454777987,  # Me
     816217667,  # Igor

requirements.txt

@@ -22,3 +22,6 @@ aiohttp
 aiohttp[speedups]
 openpyxl
 lexorank-py
+
+# PDF
+reportlab

routers/product.py

@@ -1,11 +1,15 @@
+import base64
+from io import BytesIO
 from typing import Annotated, Union
 
 from fastapi import APIRouter, Depends, UploadFile
 from sqlalchemy.ext.asyncio import AsyncSession
-
+from starlette.responses import StreamingResponse
+from fastapi.responses import FileResponse
 import utils.dependecies
 from backend.session import get_session
-from schemas.barcode import GetProductBarcodeResponse, GetProductBarcodeRequest
+from schemas.barcode import GetProductBarcodeResponse, GetProductBarcodeRequest, GetProductBarcodePdfResponse, \
+    GetProductBarcodePdfRequest
 from schemas.base import PaginationSchema
 from schemas.product import *
 from services.auth import get_current_user
@@ -127,6 +131,28 @@ async def get_product_barcode(
     return await BarcodeService(session).get_barcode(request)
 
 
+@product_router.post(
+    '/barcode/get-pdf',
+    operation_id='get_product_barcode_pdf',
+    response_model=GetProductBarcodePdfResponse
+)
+async def get_product_barcode_pdf(
+        request: GetProductBarcodePdfRequest,
+        session: Annotated[AsyncSession, Depends(get_session)]
+):
+    filename, pdf_buffer = await BarcodeService(session).get_barcode_pdf(request)
+    pdf_buffer: BytesIO
+    base64_string = base64.b64encode(pdf_buffer.read()).decode('utf-8')
+    return GetProductBarcodePdfResponse(
+        base64_string=base64_string,
+        filename=filename,
+        mime_type='application/pdf'
+    )
+    # return StreamingResponse(content=pdf_buffer,
+    #                          media_type='application/pdf',
+    #                          headers={"Content-Disposition": f"inline; filename={filename}"})
+
+
 @product_router.post(
     '/images/upload/{product_id}',
     response_model=ProductUploadImageResponse,

schemas/barcode.py

@@ -77,6 +77,10 @@ class GetProductBarcodeRequest(CustomModelCamel):
     barcode_template_id: int | None = None
 
 
+class GetProductBarcodePdfRequest(GetProductBarcodeRequest):
+    quantity: int
+
+
 # endregion
 
 # region Responses
@@ -115,4 +119,10 @@ class GetProductBarcodeResponse(CustomModelCamel):
 
 class GetAllBarcodeTemplateSizesResponse(CustomModelCamel):
     sizes: list[BarcodeTemplateSizeSchema]
+
+
+class GetProductBarcodePdfResponse(CustomModelCamel):
+    base64_string: str
+    filename: str
+    mime_type: str
 # endregion

services/barcode.py

@@ -2,6 +2,7 @@ from sqlalchemy import select, update, insert
 from sqlalchemy.orm import selectinload, joinedload
 
 from barcodes.attributes import AttributeWriterFactory
+from barcodes.generator.default_generator import DefaultBarcodeGenerator
 from models import BarcodeTemplate, BarcodeTemplateAttribute, barcode_template_attribute_link, Product, \
     BarcodeTemplateAdditionalField, BarcodeTemplateSize
 from schemas.barcode import *
@@ -73,6 +74,30 @@ class BarcodeService(BaseService):
         )
         return GetProductBarcodeResponse(barcode=barcode)
 
+    async def get_barcode_pdf(self, request: GetProductBarcodePdfRequest) -> GetProductBarcodeResponse:
+        # get product by id
+        stmt = (
+            select(Product)
+            .options(
+                joinedload(Product.client)
+            )
+            .filter(Product.id == request.product_id)
+        )
+        query = await self.session.execute(stmt)
+        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'
+        pdf_buffer = default_generator.generate(
+            request.barcode,
+            product,
+            barcode_template,
+            request.quantity
+        )
+        return filename, pdf_buffer
+
     # endregion
 
     # region Template