Pythonと画像ベクター化APIでSVGを保存する方法：テストと変換の復旧

import os
import sys
import time
from pathlib import Path
 
import requests
 
API = "https://api.perfectvector.com/v1"
AUTH = {"Authorization": f"Bearer {os.environ['PERFECTVECTOR_API_KEY']}"}
 
 
def checked(response):
    content_type = response.headers.get("Content-Type", "").split(";")[0]
    if response.status_code >= 400 and content_type == "application/problem+json":
        problem = response.json()
        raise RuntimeError(f"{problem['code']} (request {problem['request_id']})")
    response.raise_for_status()
    return response
 
 
def vectorize(source, destination, operation_id):
    with source.open("rb") as image:
        response = checked(requests.post(
            f"{API}/vectorizations",
            headers={**AUTH, "Idempotency-Key": operation_id, "Prefer": "wait=10"},
            files={"image": (source.name, image)},
            timeout=30,
        ))
 
    conversion = response.json()
    conversion_id = conversion["id"]
    print(f"Conversion ID: {conversion_id}", flush=True)
    deadline = time.monotonic() + 720
    while conversion["status"] in {"queued", "processing"}:
        if time.monotonic() >= deadline:
            raise TimeoutError(f"Stopped polling {conversion_id}")
        time.sleep(2)
        conversion = checked(requests.get(
            f"{API}/vectorizations/{conversion_id}", headers=AUTH, timeout=30,
        )).json()
 
    if conversion["status"] != "succeeded":
        error = conversion["results"][0].get("error") or {}
        raise RuntimeError(f"{conversion_id}: {error.get('code', conversion['status'])}")
 
    svg = checked(requests.get(
        f"{API}/vectorizations/{conversion_id}/result", headers=AUTH, timeout=30,
    ))
    if svg.headers.get("Content-Type", "").split(";")[0] != "image/svg+xml":
        raise ValueError("Expected an SVG response")
    partial = destination.with_suffix(".svg.part")
    partial.write_bytes(svg.content)
    partial.replace(destination)
    print(f"{destination} saved ({len(svg.content)} bytes)")
 
 
if __name__ == "__main__":
    source = Path(sys.argv[1])
    if source.suffix.lower() not in {".png", ".jpg", ".jpeg", ".webp"}:
        raise SystemExit("Choose a PNG, JPEG or WebP file")
    if source.stat().st_size > 5 * 1024 * 1024:
        raise SystemExit("Choose a file no larger than 5 MiB")
    vectorize(source, source.with_suffix(".svg"), sys.argv[2])

python vectorize.py logo.png logo-asset-0001