feat: work shifts by QR codes

generators/work_shifts_qr_code_generator/__init__.py

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+from .generator import WorkShiftsQRCodeGenerator

generators/work_shifts_qr_code_generator/generator.py

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+import os
+from io import BytesIO
+
+from reportlab.pdfgen.canvas import Canvas
+from reportlab_qrcode import QRCodeImage
+from reportlab.lib.styles import ParagraphStyle, getSampleStyleSheet
+from reportlab.lib.units import mm
+from reportlab.pdfbase import pdfmetrics
+from reportlab.pdfbase.ttfonts import TTFont
+from reportlab.platypus import SimpleDocTemplate, Paragraph
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from constants import APP_PATH
+from models import User
+from services.user import UserService
+
+
+class WorkShiftsQRCodeGenerator:
+    def __init__(self, session: AsyncSession):
+        self._session = session
+        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))
+
+        styles = getSampleStyleSheet()
+        self.small_style = ParagraphStyle(
+            'Small',
+            parent=styles['Normal'],
+            alignment=1,
+            fontName='DejaVuSans',  # Specify the new font
+            fontSize=9,
+            leading=12,
+            spaceAfter=2,
+            rightIndent=2,
+        )
+
+    def _create_doc(self, buffer):
+        return SimpleDocTemplate(
+            buffer,
+            pagesize=(self.page_width, self.page_height),
+            rightMargin=1,
+            leftMargin=1,
+            topMargin=1,
+            bottomMargin=1
+        )
+
+    async def generate(self, user_id: int) -> BytesIO:
+        buffer = BytesIO()
+        doc = self._create_doc(buffer)
+
+        def on_first_page(canvas: Canvas, doc):
+            qr = QRCodeImage(str(user_id), size=33 * mm)
+            qr.drawOn(canvas, 34, 0)
+
+        user: User = await UserService(self._session).get_by_id(user_id)
+        position = user.position.name if user.position else ""
+        user_info = Paragraph(
+            f"{user.first_name} {user.second_name}\n{position}",
+            self.small_style
+        )
+
+        doc.build([user_info], on_first_page)
+
+        buffer.seek(0)
+        return buffer