| | import base64 |
| | import io |
| | from typing import Optional |
| | from urllib.parse import unquote |
| |
|
| | from fsspec import AbstractFileSystem |
| |
|
| |
|
| | class DataFileSystem(AbstractFileSystem): |
| | """A handy decoder for data-URLs |
| | |
| | Example |
| | ------- |
| | >>> with fsspec.open("data:,Hello%2C%20World%21") as f: |
| | ... print(f.read()) |
| | b"Hello, World!" |
| | |
| | See https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs |
| | """ |
| |
|
| | protocol = "data" |
| |
|
| | def __init__(self, **kwargs): |
| | """No parameters for this filesystem""" |
| | super().__init__(**kwargs) |
| |
|
| | def cat_file(self, path, start=None, end=None, **kwargs): |
| | pref, data = path.split(",", 1) |
| | if pref.endswith("base64"): |
| | return base64.b64decode(data)[start:end] |
| | return unquote(data).encode()[start:end] |
| |
|
| | def info(self, path, **kwargs): |
| | pref, name = path.split(",", 1) |
| | data = self.cat_file(path) |
| | mime = pref.split(":", 1)[1].split(";", 1)[0] |
| | return {"name": name, "size": len(data), "type": "file", "mimetype": mime} |
| |
|
| | def _open( |
| | self, |
| | path, |
| | mode="rb", |
| | block_size=None, |
| | autocommit=True, |
| | cache_options=None, |
| | **kwargs, |
| | ): |
| | if "r" not in mode: |
| | raise ValueError("Read only filesystem") |
| | return io.BytesIO(self.cat_file(path)) |
| |
|
| | @staticmethod |
| | def encode(data: bytes, mime: Optional[str] = None): |
| | """Format the given data into data-URL syntax |
| | |
| | This version always base64 encodes, even when the data is ascii/url-safe. |
| | """ |
| | return f"data:{mime or ''};base64,{base64.b64encode(data).decode()}" |
| |
|
