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Update main.py
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main.py
CHANGED
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"""
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FastAPI 版 SVG ➜ PNG 转换服务
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──────────────────────────────────────────
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1. 自动检测 / 定位 Inkscape
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2.
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3. 支持 DPI / 宽高 / 背景色 / 透明 / 导出区域 / 指定元素 ID / 简化 SVG
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4. 返回生成的 PNG 图片文件
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──────────────────────────────────────────
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运行:
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python main.py
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接口:
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POST /convert ➜ Multipart
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GET /health ➜
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"""
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import os
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import subprocess
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import platform
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import
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import shutil
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import uuid
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import base64
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import mimetypes
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import urllib.request
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import
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from pathlib import Path
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from typing import Optional
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from fastapi import FastAPI,
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from fastapi.responses import FileResponse, JSONResponse
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###############################################################################
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@@ -48,10 +50,10 @@ def ensure_inkscape_available() -> tuple[bool, str]:
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common_paths: list[str] = []
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if system == "Windows":
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common_paths = [
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r"C:\Program Files\Inkscape\bin\inkscape.exe",
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r"C:\Program Files (x86)\Inkscape\bin\inkscape.exe",
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r"C:\Program Files\Inkscape\inkscape.exe",
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r"C:\Program Files (x86)\Inkscape\inkscape.exe",
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]
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elif system == "Linux":
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common_paths = [
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@@ -64,44 +66,58 @@ def ensure_inkscape_available() -> tuple[bool, str]:
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"/Applications/Inkscape.app/Contents/MacOS/inkscape",
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"/usr/local/bin/inkscape",
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]
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return True, f"在 {path} 找到 Inkscape"
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return False, "未找到 Inkscape,请安装或手动加入 PATH"
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###############################################################################
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# 2.
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###############################################################################
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# 匹配 <image ... href="http(s)://..."> 或 xlink:href
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IMG_TAG_PATTERN = re.compile(
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r'<image[^>]+(?:href|xlink:href)\s*=\s*["\']([^"\']+)["\']',
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)
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def download_and_encode(url: str) -> str:
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"""下载远程图片并转为 data URI(Base64)"""
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try:
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-
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data = resp.read()
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mime, _ = mimetypes.guess_type(
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mime = mime or "image/png"
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b64 = base64.b64encode(data).decode("ascii")
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return f"data:{mime};base64,{b64}"
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except Exception as e:
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# 失败则返回原链接(Inkscape 可能渲染空白 / 红叉)
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print(f"[WARN] 下载外链图片失败 {url}: {e}")
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return url
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def embed_external_images(svg_path: str) -> str:
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"""把 SVG 中的远程图片下载并嵌入(Base64),返回新的临时 SVG 路径"""
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with open(svg_path, "r", encoding="utf-8") as f:
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svg_text = f.read()
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if "http://" not in svg_text and "https://" not in svg_text:
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return svg_path #
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def replacer(match: re.Match) -> str:
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url = match.group(1)
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return new_path
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###############################################################################
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#
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###############################################################################
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def convert_svg_to_png(
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src_svg_path: str,
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export_plain_svg: bool = False,
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) -> tuple[Optional[str], str]:
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"""调用 Inkscape CLI 将 SVG 转为 PNG,返回 (文件路径 or None, 消息)"""
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-
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ok, msg = ensure_inkscape_available()
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if not ok:
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return None, msg
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# 预处理外链
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processed_svg = embed_external_images(src_svg_path)
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tmp_dir = tempfile.mkdtemp()
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cmd += ["--export-height", str(height)]
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if background_color != "transparent":
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cmd += ["--export-background", background_color]
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-
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if export_area == "drawing":
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cmd.append("--export-area-drawing")
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elif export_area == "page":
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cmd.append("--export-area-page")
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elif export_area == "id" and export_id:
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cmd += ["--export-id", export_id]
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if export_plain_svg:
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cmd.append("--export-plain-svg")
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try:
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subprocess.run(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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text=True,
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check=True,
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)
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if not os.path.exists(output_path):
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return None, "未生成 PNG 文件"
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# 把结果移动到项目根目录 output 目录
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out_dir = Path(__file__).parent / "output"
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out_dir.mkdir(exist_ok=True)
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final_path = out_dir / output_name
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return None, f"未知错误:{e}"
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###############################################################################
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#
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###############################################################################
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app = FastAPI(title="SVG ➜ PNG 转换 API", version="1.
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@app.get("/health", summary="健康检查")
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def health():
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return {"status": "ok"}
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@app.post(
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"/convert",
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):
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"""
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使用 Inkscape 将上传的 SVG 转换为 PNG 并返回。
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所有参数与 Gradio 版本保持一致。
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"""
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#
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temp_dir = tempfile.mkdtemp()
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uploaded_path = os.path.join(temp_dir, svg_file.filename)
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with open(uploaded_path, "wb") as f:
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export_id=export_id if export_area == "id" else None,
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export_plain_svg=export_plain_svg,
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)
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shutil.rmtree(temp_dir, ignore_errors=True)
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if png_path is None:
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raise HTTPException(status_code=400, detail=msg)
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# 返回 PNG 文件流
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return FileResponse(
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png_path,
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media_type="image/png",
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)
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###############################################################################
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#
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###############################################################################
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if __name__ == "__main__":
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import uvicorn
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# 确保 output 目录存在
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(Path(__file__).parent / "output").mkdir(exist_ok=True)
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uvicorn.run("main:app", host="0.0.0.0", port=7860, reload=False)
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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FastAPI 版 SVG ➜ PNG 转换服务
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──────────────────────────────────────────
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功能:
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1. 自动检测 / 定位 Inkscape
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2. 下载并嵌入 <image href="http/https"> 外链图片(Base64,支持中文 URL)
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3. 支持 DPI / 宽高 / 背景色 / 透明 / 导出区域 / 指定元素 ID / 简化 SVG
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4. 返回生成的 PNG 图片文件
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运行:
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python main.py
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接口:
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POST /convert ➜ Multipart 上传 svg_file + 参数,返回 image/png
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GET /health ➜ 健康检查
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"""
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import os
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import platform
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import re
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import shutil
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import subprocess
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import tempfile
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import uuid
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from pathlib import Path
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from typing import Optional
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import base64
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import mimetypes
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import urllib.request
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import urllib.parse
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from fastapi import FastAPI, File, Form, HTTPException, UploadFile
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from fastapi.responses import FileResponse, JSONResponse
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###############################################################################
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common_paths: list[str] = []
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if system == "Windows":
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common_paths = [
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r"C:\Program Files\Inkscape\inkscape.exe",
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r"C:\Program Files (x86)\Inkscape\inkscape.exe",
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r"C:\Program Files\Inkscape\bin\inkscape.exe",
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r"C:\Program Files (x86)\Inkscape\bin\inkscape.exe",
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]
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elif system == "Linux":
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common_paths = [
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"/Applications/Inkscape.app/Contents/MacOS/inkscape",
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"/usr/local/bin/inkscape",
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]
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for p in common_paths:
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if os.path.exists(p):
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os.environ["PATH"] += os.pathsep + os.path.dirname(p)
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return True, f"在 {p} 找到 Inkscape"
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return False, "未找到 Inkscape,请安装或手动加入 PATH"
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###############################################################################
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# 2. URL 规范化(解决中文 / 空格 / () 等字符)
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###############################################################################
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def normalize_url(url: str) -> str:
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"""
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将包含非 ASCII 字符的 URL 转为合法百分号编码格式
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"""
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parsed = urllib.parse.urlparse(url)
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# 域名 IDNA(如有中文)
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netloc = parsed.netloc.encode("idna").decode("ascii")
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# 路径 / 查询 / 片段 百分号转义
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path = urllib.parse.quote(parsed.path, safe="/")
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params = urllib.parse.quote(parsed.params, safe=":&=")
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query = urllib.parse.quote_plus(parsed.query, safe="=&")
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fragment = urllib.parse.quote(parsed.fragment, safe="")
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return urllib.parse.urlunparse((parsed.scheme, netloc, path, params, query, fragment))
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###############################################################################
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# 3. 下载并嵌入外链图片
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###############################################################################
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IMG_TAG_PATTERN = re.compile(
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r'<image[^>]+(?:href|xlink:href)\s*=\s*["\']([^"\']+)["\']',
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re.I,
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)
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def download_and_encode(url: str) -> str:
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"""下载远程图片并转为 data URI(Base64)"""
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try:
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safe_url = normalize_url(url) # ⭐ 关键改动
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req = urllib.request.Request(safe_url, headers={"User-Agent": "Mozilla/5.0"})
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with urllib.request.urlopen(req, timeout=20) as resp:
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data = resp.read()
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mime, _ = mimetypes.guess_type(safe_url)
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mime = mime or "image/png"
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b64 = base64.b64encode(data).decode("ascii")
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return f"data:{mime};base64,{b64}"
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except Exception as e:
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print(f"[WARN] 下载外链图片失败 {url}: {e}")
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return url # 失败则返回原链接
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def embed_external_images(svg_path: str) -> str:
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"""把 SVG 中的远程图片下载并嵌入(Base64),返回新的临时 SVG 路径"""
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with open(svg_path, "r", encoding="utf-8") as f:
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svg_text = f.read()
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if "http://" not in svg_text and "https://" not in svg_text:
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return svg_path # 无外链直接返回
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def replacer(match: re.Match) -> str:
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url = match.group(1)
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return new_path
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###############################################################################
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# 4. 核心转换函数
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###############################################################################
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def convert_svg_to_png(
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src_svg_path: str,
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export_plain_svg: bool = False,
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) -> tuple[Optional[str], str]:
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"""调用 Inkscape CLI 将 SVG 转为 PNG,返回 (文件路径 or None, 消息)"""
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ok, msg = ensure_inkscape_available()
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if not ok:
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return None, msg
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processed_svg = embed_external_images(src_svg_path)
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tmp_dir = tempfile.mkdtemp()
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cmd += ["--export-height", str(height)]
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if background_color != "transparent":
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cmd += ["--export-background", background_color]
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if export_area == "drawing":
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cmd.append("--export-area-drawing")
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elif export_area == "page":
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cmd.append("--export-area-page")
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elif export_area == "id" and export_id:
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cmd += ["--export-id", export_id]
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if export_plain_svg:
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cmd.append("--export-plain-svg")
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try:
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subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, check=True)
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if not os.path.exists(output_path):
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return None, "未生成 PNG 文件"
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out_dir = Path(__file__).parent / "output"
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out_dir.mkdir(exist_ok=True)
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final_path = out_dir / output_name
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return None, f"未知错误:{e}"
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###############################################################################
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# 5. FastAPI 应用
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###############################################################################
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app = FastAPI(title="SVG ➜ PNG 转换 API", version="1.1.0")
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@app.get("/health", summary="健康检查")
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def health():
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return JSONResponse({"status": "ok"})
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@app.post(
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"/convert",
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):
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"""
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使用 Inkscape 将上传的 SVG 转换为 PNG 并返回。
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"""
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# 保存上传文件
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temp_dir = tempfile.mkdtemp()
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uploaded_path = os.path.join(temp_dir, svg_file.filename)
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with open(uploaded_path, "wb") as f:
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export_id=export_id if export_area == "id" else None,
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export_plain_svg=export_plain_svg,
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)
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shutil.rmtree(temp_dir, ignore_errors=True)
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if png_path is None:
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raise HTTPException(status_code=400, detail=msg)
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return FileResponse(
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png_path,
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media_type="image/png",
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)
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###############################################################################
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# 6. 入口
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###############################################################################
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if __name__ == "__main__":
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import uvicorn
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(Path(__file__).parent / "output").mkdir(exist_ok=True)
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uvicorn.run("main:app", host="0.0.0.0", port=7860, reload=False)
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