用Python给二维码图片添加提示文字

# toolbox.py
from typing import Any
 
 
class UserAgent:
 def __init__(self, user_agent: str = '', request: Any = None):
  if request is not None:
try:
 user_agent = request.headers.get('user-agent', '')  # For Sanic
except AttributeError:
 user_agent = request.META.get('HTTP_USER_AGENT', '')  # Django
  self.user_agent = user_agent
 
 @property
 def is_alipay(self) -> bool:
  return "AlipayClient/" in self.user_agent
 
 @property
 def is_wechat(self) -> bool:
  return "MicroMessenger/" in self.user_agent
 
 @property
 def is_qq(self) -> bool:
  return " QQ/" in self.user_agent
 
 @property
 def scan_type(self) -> str:
  if self.is_wechat or self.is_qq:
return "wechat"
  if self.is_alipay:
return "alipay"
  return "unknown"

# image_text.py
"""
给图片（如二维码）添上文字
Usage::
 >>> from xxx import deco_image
 >>> deco_image(image_path, text)  # 替换旧图片
 >>> deco_image(image_path, text, new_path, color='red')  # 保留旧图片并指定文字颜色
"""
from pathlib import Path
from typing import Optional, Tuple, Union
 
from PIL import Image, ImageDraw, ImageFont  # pip install pillow
 
TIP = "请用微信扫码支付\n或分享到微信中打开"
 
 
# 获取图片宽度
def get_img_width(fname) -> int:
 return Image.open(fname).size[0]
 
 
# 获取图片高度
def get_img_height(fname) -> int:
 return Image.open(fname).size[1]
 
 
# 给图片加文字
# 生成blank_img空白图片，加上文字之后生成新图片或覆盖旧图, 宽度为origin_img原始图片的宽度
 
MARGIN_LEFT, MARGIN_TOP = 50, 15
FONT_SIZE = 22
FONT_COLOR = "red"
 
 
def gen_text_img(
 origin_img: Union[Path, str],
 text: str,
 img_path=None,
 color=FONT_COLOR,
 font_size: int = FONT_SIZE,
 margin_left: int = MARGIN_LEFT,
 margin_top: int = MARGIN_TOP,
 blank_img=None,
 font_path: Optional[str] = None,
 show_img: bool = False,
) -> Union[Path, str]:
 width = get_img_width(origin_img)
 if blank_img is None:
  blank_img = Path(f"/tmp/blank-{width}.png")
 elif isinstance(blank_img, str):
  blank_img = Path(blank_img)
 if not blank_img.exists():
  Image.new("RGB", (width, 70), (255, 255, 255)).save(blank_img)
 im = Image.open(blank_img)
 draw = ImageDraw.Draw(im)
 if font_path is None:
  # font_path = r"C:\Windows\Fonts\simsun.ttc"
  # font_path = "/System/Library/Fonts/Supplemental/Songti.ttc"
  font_path = "/usr/share/fonts/truetype/windows-font/Songti.ttc"
 fnt = ImageFont.truetype(font_path, font_size)
 draw.text((margin_left, margin_top), text, fill=color, font=fnt)
 if img_path is None:
  img_path = Path(origin_img)
  img_path = img_path.with_name(f"{img_path.stem}-{len(text)}{img_path.suffix}")
 im.save(img_path)
 if show_img:
  im.show()
 return img_path
 
 
# 拼接图片，把上面生成的文字图片拼接到原图上面
# 生成一张宽度一致，高度为两张图片之和的空白长图
# 分别打开图片进行粘贴到空白长图里面
 
def join_imgs(text_img, origin_img, new_path=None) -> None:
 w = get_img_width(text_img)
 fh = get_img_height(text_img)
 oh = get_img_height(origin_img)
 
 blank_long_img = Image.new("RGBA", (w, fh + oh))  # 空白长图
 
 font_img = Image.open(text_img).resize((w, fh), Image.ANTIALIAS)
 blank_long_img.paste(font_img, (0, 0))
 
 img1 = Image.open(origin_img).resize((w, oh), Image.ANTIALIAS)
 blank_long_img.paste(img1, (0, fh))
 if new_path is None:
  new_path = origin_img
 blank_long_img.save(new_path)
 blank_long_img.show()
 
 
def deco_image(
 fpath: Union[Path, str],  # 图片路径
 text: str = TIP,  # 要添加的文字
 new_path: Union[Path, str, None] = None,  # 新图片要保存的路径（默认覆盖原图）
 color: Union[str, Tuple[int, int, int]] = FONT_COLOR,  # 文字颜色
 font_size: int = FONT_SIZE,  # 文字高度
 margin_left: int = MARGIN_LEFT,
 margin_top: int = MARGIN_TOP,
) -> None:
 text_img = gen_text_img(
  fpath,
  text,
  color=color,
  font_size=font_size,
  margin_left=margin_left,
  margin_top=margin_top,
 )
 join_imgs(text_img, fpath)

sudo mkdir /usr/share/fonts/truetype/windows-font
sudo chmod 777 /usr/share/fonts/truetype/windows-font
cd /usr/share/fonts/truetype/windows-font
wget https://gitee.com/waketzheng/carstino/attach_files/703450/download/Songti.ttc  # 该文件比较大，有66.9MB

from pathlib import Path
from hashlib import md5
 
import qrcode  # pip install qrcode
from sanic import Blueprint
from sanic.log import logger
from sanic.request import Request
from sanic.response import json
 
from .models import Order
from .image_text import deco_image
from .toolbox import UserAgent
from .utils import async_http_post, get_host
from .consts import URL_PREFIX, WX_PAY_URL
 
 
bp = Blueprint("epay", url_prefix=URL_PREFIX)
 
async def get_qf_mch(community):
 pass
 
 
@bp.route("/pay-link", methods=["POST"])
async def pay_link(request: Request):
 requires, data = ["bills", "total", "next"], request.json
 logger.info(f"{request.url = } ;  {request.json = }")
 # 已经1分钟内生成过对应订单的，直接去支付
 content = request.body + f"{datetime.now():%y%m%d%H%M%S}".encode()
 body = md5(content).hexdigest()
 if not (order := await Order.filter(body=body).first()):
  order = await new_pay_order(origin, data, request, body)
 mchid, mch_name = await get_qf_mch(order.community)
 if mchid:
  host = get_host(request.headers)
  if not UserAgent(request=request).is_wechat:
# 故判断当前是否在微信里，如果不是就直接生成二维码
frontend_url = data["next"]
fpath = "payit/" + md5(frontend_url.encode()).hexdigest() + ".png"
if not (p := BASE_DIR / "media" / fpath).parent.exists():
 p.parent.mkdir(parents=True)
qrcode.make(frontend_url).save(p)
deco_image(p)
img_url = host + URL_PREFIX + "/media/" + fpath
return json({"payUrl": img_url})
  return json(qf_pay_it(mchid, mch_name, order, host=host))
 url = WX_PAY_URL
 if not (request_data := order.post_data).get("mch"):
  request_data.update(mch=1)  # 未配置支付的,先用1
 res = await async_http_post(url, request_data)
 try:
  res_json = res.json()
 except Exception as e:
  logger.error(f"{e = }; {url = }; {order.post_data=}; {res.content = }")
 return json(res_json)