298 lines
10 KiB
Python
298 lines
10 KiB
Python
# PDF生成服务 - 支持中文和富文本
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import os
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from reportlab.lib.pagesizes import A4
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from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
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from reportlab.lib.units import mm
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from reportlab.lib import colors
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from reportlab.platypus import (
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SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle
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)
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from reportlab.pdfbase import pdfmetrics
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from reportlab.pdfbase.ttfonts import TTFont
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from reportlab.lib.enums import TA_CENTER, TA_LEFT
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from reportlab.pdfgen import canvas as pdfcanvas
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# 注册中文字体
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# Windows 和 Linux 使用不同路径
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if os.name == 'nt': # Windows
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FONT_PATH = r"C:\Windows\Fonts\msyh.ttc"
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FONT_BOLD_PATH = r"C:\Windows\Fonts\msyhbd.ttc"
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else: # Linux (Docker)
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# 直接尝试常见的中文字体路径
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possible_paths = [
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"/usr/share/fonts/truetype/wqy/wqy-microhei.ttc",
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"/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc",
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"/usr/share/fonts/truetype/noto/NotoSansCJK-Regular.ttc",
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"/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
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]
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FONT_PATH = None
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for p in possible_paths:
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if os.path.exists(p):
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FONT_PATH = p
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break
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if not FONT_PATH:
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FONT_PATH = possible_paths[0] # 使用第一个作为默认值（会触发异常）
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FONT_BOLD_PATH = FONT_PATH # 使用同一字体（不支持粗体分离）
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try:
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pdfmetrics.registerFont(TTFont("Chinese", FONT_PATH))
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# 注册粗体（如果路径不同才注册，相同则复用）
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if FONT_BOLD_PATH != FONT_PATH:
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try:
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pdfmetrics.registerFont(TTFont("Chinese-Bold", FONT_BOLD_PATH))
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except:
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pdfmetrics.registerFont(TTFont("Chinese-Bold", FONT_PATH))
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else:
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# 同一字体，注册为 Chinese-Bold 别名
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try:
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pdfmetrics.registerFont(TTFont("Chinese-Bold", FONT_PATH))
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except:
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pass
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CHINESE_FONT_OK = True
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except Exception as e:
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CHINESE_FONT_OK = False
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def md_to_xml(text):
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"""将markdown转换为reportlab XML markup"""
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if not text:
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return ""
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result = []
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i = 0
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while i < len(text):
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# 处理 bold **text** - 使用中文字体粗体
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if text[i:i+2] == '**':
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end = text.find('**', i+2)
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if end != -1:
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if CHINESE_FONT_OK:
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result.append(f'<font name="Chinese-Bold">{text[i+2:end]}</font>')
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else:
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result.append(f'<b>{text[i+2:end]}</b>')
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i = end + 2
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continue
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# 处理 italic *text*
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if text[i] == '*' and (i == 0 or text[i-1] not in '*_'):
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end = text.find('*', i+1)
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if end != -1 and text[end-1] != '*':
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result.append(f'<i>{text[i+1:end]}</i>')
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i = end + 1
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continue
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# 处理 inline code `text`
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if text[i] == '`':
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end = text.find('`', i+1)
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if end != -1:
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result.append(f'<font name="Courier">{text[i+1:end]}</font>')
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i = end + 1
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continue
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result.append(text[i])
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i += 1
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return ''.join(result)
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class PianoPDF:
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def __init__(self):
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self.elements = []
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self.styles = getSampleStyleSheet()
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if CHINESE_FONT_OK:
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self.base_font = "Chinese"
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self.bold_font = "Chinese-Bold"
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else:
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self.base_font = "Helvetica"
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self.bold_font = "Helvetica-Bold"
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# 标题样式
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self.title_style = ParagraphStyle(
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"CustomTitle",
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parent=self.styles["Heading1"],
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fontName=self.bold_font,
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fontSize=18,
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spaceAfter=10*mm,
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alignment=TA_CENTER,
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)
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# 二级标题
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self.heading_style = ParagraphStyle(
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"CustomHeading",
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parent=self.styles["Heading2"],
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fontName=self.bold_font,
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fontSize=14,
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spaceAfter=6*mm,
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spaceBefore=6*mm,
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textColor=colors.HexColor("#2c3e50"),
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)
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# 三级标题
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self.h3_style = ParagraphStyle(
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"CustomH3",
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parent=self.styles["Heading3"],
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fontName=self.bold_font,
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fontSize=12,
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spaceAfter=4*mm,
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spaceBefore=4*mm,
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textColor=colors.HexColor("#34495e"),
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)
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# 正文样式
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self.body_style = ParagraphStyle(
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"CustomBody",
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parent=self.styles["Normal"],
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fontName=self.base_font,
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fontSize=10,
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spaceAfter=4*mm,
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leading=14,
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)
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# 表格样式
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self.table_style = TableStyle([
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("BACKGROUND", (0, 0), (-1, 0), colors.HexColor("#3498db")),
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("TEXTCOLOR", (0, 0), (-1, 0), colors.whitesmoke),
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("ALIGN", (0, 0), (-1, -1), "LEFT"),
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("FONTNAME", (0, 0), (-1, 0), self.bold_font),
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("FONTSIZE", (0, 0), (-1, 0), 10),
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("BOTTOMPADDING", (0, 0), (-1, 0), 8),
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("BACKGROUND", (0, 1), (-1, -1), colors.white),
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("FONTNAME", (0, 1), (-1, -1), self.base_font),
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("FONTSIZE", (0, 1), (-1, -1), 9),
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("GRID", (0, 0), (-1, -1), 0.5, colors.grey),
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("ROWBACKGROUNDS", (0, 1), (-1, -1), [colors.white, colors.HexColor("#f8f9fa")]),
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])
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def add_title(self, text):
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self.elements.append(Paragraph(md_to_xml(text), self.title_style))
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self.elements.append(Spacer(1, 5*mm))
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def add_heading(self, text, level=2):
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if level == 3:
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self.elements.append(Paragraph(md_to_xml(text), self.h3_style))
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else:
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self.elements.append(Paragraph(md_to_xml(text), self.heading_style))
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def add_paragraph(self, text):
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if text:
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self.elements.append(Paragraph(md_to_xml(text), self.body_style))
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self.elements.append(Spacer(1, 3*mm))
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def add_list(self, items):
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for item in items:
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if item:
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self.elements.append(Paragraph(f"• {md_to_xml(item)}", self.body_style))
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self.elements.append(Spacer(1, 3*mm))
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def add_table(self, data):
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if not data or len(data) < 2:
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return
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table_data = []
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for row in data:
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table_data.append([Paragraph(md_to_xml(str(cell)), self.body_style) if cell else "" for cell in row])
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if table_data:
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table = Table(table_data)
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table.setStyle(self.table_style)
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self.elements.append(table)
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self.elements.append(Spacer(1, 5*mm))
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def generate_pdf(plan_id, student_name, content, output_dir, rendered_report=None, watermark_text=None):
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"""生成PDF文件"""
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os.makedirs(output_dir, exist_ok=True)
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output_path = os.path.join(output_dir, f"plan_{plan_id}.pdf")
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doc = SimpleDocTemplate(
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output_path, pagesize=A4,
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rightMargin=20*mm, leftMargin=20*mm,
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topMargin=20*mm, bottomMargin=20*mm,
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)
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pdf = PianoPDF()
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if rendered_report:
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# 解析Markdown并添加到PDF
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lines = rendered_report.split('\n')
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in_table = False
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table_data = []
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for line in lines:
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line = line.strip()
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if not line or line.startswith('---'):
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if in_table and table_data:
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pdf.add_table(table_data)
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table_data = []
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in_table = False
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continue
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if line.startswith('# ') and not line.startswith('## '):
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if in_table and table_data:
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pdf.add_table(table_data)
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table_data = []
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in_table = False
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pdf.add_title(line.replace('# ', ''))
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elif line.startswith('## '):
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if in_table and table_data:
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pdf.add_table(table_data)
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table_data = []
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in_table = False
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pdf.add_heading(line.replace('## ', ''))
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elif line.startswith('### '):
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pdf.add_heading(line.replace('### ', ''), level=3)
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elif line.startswith('|') and '|' in line[1:]:
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in_table = True
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raw_cells = [c.strip() for c in line.split('|')[1:-1]]
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cells = [md_to_xml(c) if c else "" for c in raw_cells]
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if cells and not all(c and c.strip().startswith('-') for c in cells if c):
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table_data.append(cells)
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elif line.startswith('- '):
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pdf.add_paragraph(f"• {line[2:]}")
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elif line and not in_table:
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pdf.add_paragraph(line)
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if in_table and table_data:
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pdf.add_table(table_data)
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else:
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# 使用结构化内容
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pdf.add_title(f"钢琴练习方案 - {student_name}")
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pdf.add_heading("学员信息")
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pdf.add_paragraph(f"学员姓名：{student_name}")
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pdf.add_paragraph(f"每日练习时间：{content.get('practice_time', 'N/A')}")
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pdf.add_paragraph(f"生成时间：{content.get('generated_at', '')}")
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if content.get("ai_report"):
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pdf.add_heading("AI个性化练习报告")
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for line in content["ai_report"].split("\n"):
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line = line.strip()
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if line.startswith("### "):
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pdf.add_heading(line.replace("### ", ""), level=3)
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elif line.startswith("## "):
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pdf.add_heading(line.replace("## ", ""))
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elif line.startswith("# "):
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pdf.add_title(line.replace("# ", ""))
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elif line.startswith("- "):
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pdf.add_paragraph(line)
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elif line:
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pdf.add_paragraph(line)
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# 水印函数（每页都绘制）
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def draw_watermark(c, doc):
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if not watermark_text:
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return
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if not CHINESE_FONT_OK:
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return
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c.saveState()
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try:
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c.setFont("Chinese", 56)
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# 浅灰色半透明
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c.setFillColor(colors.Color(0.6, 0.6, 0.6, alpha=0.25))
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# 旋转45度
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c.translate(A4[0]/2, A4[1]/2)
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c.rotate(45)
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# 绘制水印文字（居中）
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c.drawCentredString(0, 0, watermark_text)
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except Exception:
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pass
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c.restoreState()
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# 移除末尾的空白元素（避免产生多余空白页）
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while pdf.elements and isinstance(pdf.elements[-1], Spacer):
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pdf.elements.pop()
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doc.build(pdf.elements, onFirstPage=draw_watermark, onLaterPages=draw_watermark)
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return output_path |