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#!/usr/bin/env python3
import base64
import os
import re
import secrets
import subprocess
from pathlib import Path
import magic
from flask import Flask, Response, jsonify, request, send_file, send_from_directory
app = Flask(__name__, static_folder=None)
app.config["MAX_CONTENT_LENGTH"] = 50 * 1024 * 1024 # 50 MB upload cap
UPLOAD_DIR = Path(__file__).parent / "uploads"
UPLOAD_DIR.mkdir(mode=0o755, exist_ok=True)
ALLOWED_MIME = {
"image/png": "png",
"image/jpeg": "jpg",
"image/gif": "gif",
"image/webp": "webp",
"image/svg+xml": "svg",
"image/bmp": "bmp",
}
# build list of allowed font directories
_FONT_DIRS: list[Path] = [
Path("/usr/share/fonts"),
Path("/usr/local/share/fonts"),
]
for _home in Path("/home").glob("*"):
_FONT_DIRS.append(_home / ".local" / "share" / "fonts")
_FONT_DIRS.append(_home / ".fonts")
def _allowed_font_dirs() -> list[str]:
"""return resolved, existent font dirs with trailing separator."""
out = []
for d in _FONT_DIRS:
try:
out.append(str(d.resolve(strict=True)) + os.sep)
except (OSError, RuntimeError):
pass
return out
@app.route("/")
def index():
return send_from_directory(app.root_path, "index.html")
@app.route("/uploads/<filename>")
def uploads(filename: str):
return send_from_directory(UPLOAD_DIR, filename)
@app.route("/upload", methods=["POST"])
def upload():
if "image" not in request.files:
return jsonify({"error": "no file provided"}), 400
f = request.files["image"]
if not f.filename:
return jsonify({"error": "empty filename"}), 400
data = f.read()
if not data:
return jsonify({"error": "empty file"}), 400
mime = magic.from_buffer(data, mime=True)
if mime not in ALLOWED_MIME:
return jsonify({"error": f"invalid file type: {mime}"}), 400
ext = ALLOWED_MIME[mime]
basename = re.sub(r"[^a-zA-Z0-9_-]", "_", Path(f.filename).stem)[:64]
filename = f"{basename}_{secrets.token_hex(4)}.{ext}"
(UPLOAD_DIR / filename).write_bytes(data)
return jsonify({"filename": filename, "url": f"uploads/{filename}"})
@app.route("/fonts")
def fonts():
try:
result = subprocess.run(
["fc-list", "--format=%{family}|%{style}|%{file}\n"],
capture_output=True,
text=True,
shell=False,
timeout=10,
check=False,
)
except (FileNotFoundError, subprocess.TimeoutExpired):
return jsonify([])
if result.returncode != 0:
return jsonify([])
if not result.stdout.strip():
return jsonify([])
def style_score(style: str) -> int:
s = style.strip().lower()
if s in ("regular", "roman", "book", "text"):
return 0
if s == "bold":
return 1
if "italic" in s or "oblique" in s:
return 2
return 3
best: dict[str, dict] = {}
for line in result.stdout.splitlines():
parts = line.split("|", 2)
if len(parts) < 3:
continue
family = parts[0].split(",")[0].strip()
if not family:
continue
style = parts[1].split(",")[0].strip()
file_path = parts[2].strip()
if not Path(file_path).exists():
continue
score = style_score(style)
if family not in best or score < best[family]["score"]:
best[family] = {"file": file_path, "score": score}
fmt_map = {"ttf": "truetype", "otf": "opentype", "woff": "woff", "woff2": "woff2"}
fonts_list = [
{
"family": family,
"file": base64.b64encode(entry["file"].encode()).decode(),
"format": fmt_map.get(Path(entry["file"]).suffix.lstrip(".").lower(), "truetype"),
}
for family, entry in best.items()
]
fonts_list.sort(key=lambda x: x["family"].casefold())
resp = jsonify(fonts_list)
resp.headers["Cache-Control"] = "public, max-age=3600"
return resp
@app.route("/font")
def font():
encoded = request.args.get("f", "")
if not encoded:
return Response("missing parameter", status=400)
try:
file_str = base64.b64decode(encoded).decode("utf-8")
except Exception:
return Response("invalid parameter", status=400)
# null byte guard
if "\x00" in file_str:
return Response("invalid parameter", status=400)
p = Path(file_str)
if not p.exists():
return Response("font not found", status=404)
try:
real = p.resolve(strict=True)
except (OSError, RuntimeError):
return Response("font not found", status=404)
# path traversal guard: real path must be under an allowed font dir
real_str = str(real) + os.sep
if not any(real_str.startswith(d) for d in _allowed_font_dirs()):
return Response("access denied", status=403)
mime_map = {
"ttf": "font/ttf",
"otf": "font/otf",
"woff": "font/woff",
"woff2": "font/woff2",
}
mime = mime_map.get(real.suffix.lstrip(".").lower(), "application/octet-stream")
return send_file(real, mimetype=mime, max_age=31536000, conditional=True)
if __name__ == "__main__":
app.run(host="0.0.0.0", port=3000)
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