Decrypt + Watermark + merge + to PDF

watermark.py

from functools import partial
from itertools import chain
import os


def runDocker(image, command):
    os.system(f"podman run -it --rm -v $PWD:/app -w /app " f"{image} {command}")


def pdfToImage(name, password):
    name_image = name + ".image"
    runDocker(
        "docker.io/minidocks/poppler",
        f"pdftoppm -opw {password} -r 300 {name}.pdf -png {name_image}",
    )
    print(f"convert {name}.pdf to {name_image}-*.png")
    for i in range(1, 10):
        name_image1 = f"{name_image}-{i}"
        if not os.path.exists(f"{name_image1}.png"):
            break
        yield name_image1


def addWatermark(name, watermark_text):
    name_watermark = name + ".watermarked"
    runDocker(
        "docker.io/dpokidov/imagemagick",
        f"{name}.png -font './NotoSansCJKtc-Regular.otf' -pointsize 128 -fill gray "
        f"-gravity northwest "
        f"-draw \"rotate 30 text 600,0 '{watermark_text}'\" {name_watermark}.png",
    )
    print(f"add watermark to {name}.png")
    return name_watermark


def mergeImages(names, name_out):
    files = map(lambda i: i + ".png", names)
    files = " ".join(files)
    print(f"merge {files} to {name_out}.png")
    runDocker(
        "docker.io/dpokidov/imagemagick",
        f"{files} -append {name_out}.png"
    )
    return name_out


def mergeImagesToPdf(names, name_out):
    files = map(lambda i: i + ".png", names)
    files = " ".join(files)
    print(f"merge {files} to {name_out}.pdf")
    runDocker(
        "docker.io/dpokidov/imagemagick",
        f"-density 300 -page A4 {files} {name_out}.pdf"
    )
    return name_out


names = [
    "202310",   # 202310.pdf
]
password = ""
watermark_text = "僅供使用"

names = map(partial(pdfToImage, password=password), names)
names = chain.from_iterable(names)
names = map(partial(addWatermark, watermark_text=watermark_text), names)
# names = map(lambda i: i + ".image-1.watermarked", names)
mergeImagesToPdf(names, "xxx.mergeall")