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https://github.com/kuhyx/signal-bot.git
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Krzysztof kuhy Rudnicki
79dab5cc01
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
120 lines
4.3 KiB
Python
120 lines
4.3 KiB
Python
# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
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"""Image fetching and JSON path walking."""
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from __future__ import annotations
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import base64
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from collections.abc import Callable
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import httpx
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import pytest
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from signal_bot.http_client import ImageFetcher, ImageFetchError
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IMAGE = b"\x89PNG\r\n\x1a\nfake"
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# The callable httpx.MockTransport expects -- not a bot command handler.
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MockHandler = Callable[[httpx.Request], httpx.Response]
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def _fetcher(handler: MockHandler) -> ImageFetcher:
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return ImageFetcher(httpx.AsyncClient(transport=httpx.MockTransport(handler)))
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def _api(payload: object, image: bytes = IMAGE) -> MockHandler:
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def handler(request: httpx.Request) -> httpx.Response:
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if "images" in str(request.url) or "breeds" in str(request.url):
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return httpx.Response(200, json=payload)
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return httpx.Response(200, content=image)
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return handler
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async def test_fetches_via_list_then_key_path() -> None:
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fetcher = _fetcher(_api([{"url": "https://cdn.example/cat.png"}]))
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encoded = await fetcher.fetch_base64("https://api/images/search", [0, "url"])
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assert base64.b64decode(encoded) == IMAGE
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async def test_fetches_via_single_key_path() -> None:
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fetcher = _fetcher(_api({"message": "https://cdn.example/dog.png"}))
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encoded = await fetcher.fetch_base64("https://api/breeds/x", ["message"])
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assert base64.b64decode(encoded) == IMAGE
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async def test_negative_index_is_supported() -> None:
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fetcher = _fetcher(_api([{"url": "https://cdn.example/cat.png"}]))
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encoded = await fetcher.fetch_base64("https://api/images/search", [-1, "url"])
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assert base64.b64decode(encoded) == IMAGE
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@pytest.mark.parametrize(
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("payload", "path"),
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[
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({"other": "x"}, ["message"]),
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([], [0, "url"]),
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([{"url": "x"}], [5, "url"]),
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({"message": "x"}, [0]),
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([{"url": "x"}], ["message"]),
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],
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)
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async def test_missing_element_raises(payload: object, path: list) -> None:
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fetcher = _fetcher(_api(payload))
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with pytest.raises(ImageFetchError, match="no element at"):
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await fetcher.fetch_base64("https://api/images/search", path)
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@pytest.mark.parametrize("payload", [{"message": 42}, {"message": ""}])
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async def test_non_url_element_raises(payload: object) -> None:
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fetcher = _fetcher(_api(payload))
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with pytest.raises(ImageFetchError, match="is not a URL"):
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await fetcher.fetch_base64("https://api/breeds/x", ["message"])
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async def test_api_error_propagates() -> None:
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fetcher = _fetcher(lambda r: httpx.Response(503))
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with pytest.raises(httpx.HTTPStatusError):
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await fetcher.fetch_base64("https://api/images/search", [0, "url"])
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async def test_image_download_error_propagates() -> None:
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def handler(request: httpx.Request) -> httpx.Response:
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if "images" in str(request.url):
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return httpx.Response(200, json=[{"url": "https://cdn.example/cat.png"}])
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return httpx.Response(404)
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with pytest.raises(httpx.HTTPStatusError):
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await _fetcher(handler).fetch_base64("https://api/images/search", [0, "url"])
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async def test_rewrite_swaps_the_thumbnail_for_the_full_size_photo() -> None:
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"""The URL actually downloaded is the rewritten one, not the one in the JSON."""
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seen: list[str] = []
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def handler(request: httpx.Request) -> httpx.Response:
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seen.append(str(request.url))
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if "observations" in str(request.url):
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return httpx.Response(200, json={"url": "https://cdn/1/square.jpeg"})
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return httpx.Response(200, content=IMAGE)
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encoded = await _fetcher(handler).fetch_base64(
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"https://api/observations", ["url"], ("/square.", "/large.")
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)
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assert base64.b64decode(encoded) == IMAGE
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assert seen[-1] == "https://cdn/1/large.jpeg"
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async def test_rewrite_that_matches_nothing_leaves_the_url_alone() -> None:
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seen: list[str] = []
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def handler(request: httpx.Request) -> httpx.Response:
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seen.append(str(request.url))
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if "observations" in str(request.url):
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return httpx.Response(200, json={"url": "https://cdn/1/original.jpeg"})
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return httpx.Response(200, content=IMAGE)
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await _fetcher(handler).fetch_base64(
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"https://api/observations", ["url"], ("/square.", "/large.")
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)
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assert seen[-1] == "https://cdn/1/original.jpeg"
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