Implement and test the getCoverArt endpoint

src/knuckles/media_retrieval.py

@@ -93,8 +93,44 @@ def hls(self, id: str) -> str:
     def get_captions(self) -> None:
         ...
 
-    def get_cover_art(self) -> None:
-        ...
+    def get_cover_art(self, id: str, file_or_directory_path: Path, size: int) -> Path:
+        """Calls the "getCoverArt" endpoint of the API.
+
+        :param id: The id of the cover art to download.
+        :type id: str
+        :param file_or_directory_path: If a directory path is passed the file will be
+        inside of it with the filename being the name of the user and
+        a guessed file extension, if not the file will be saved
+        directly in the given path.
+        :type file_or_directory_path: Path
+        :param size: The size of the image to be scale to in a square.
+        :type size: int
+        :return Returns the given path
+        :rtype Path
+        """
+
+        response = self.api.raw_request("getCoverArt", {"id": id, "size": size})
+        response.raise_for_status()
+
+        if file_or_directory_path.is_dir():
+            file_extension = guess_extension(
+                response.headers["content-type"].partition(";")[0].strip()
+            )
+
+            filename = id + file_extension if file_extension else id
+
+            download_path = Path(
+                file_or_directory_path,
+                filename,
+            )
+        else:
+            download_path = file_or_directory_path
+
+        with open(download_path, "wb") as f:
+            for chunk in response.iter_content(chunk_size=8192):
+                f.write(chunk)
+
+        return download_path
 
     def get_lyrics(self) -> None:
         ...

tests/api/test_media_retrieval.py

@@ -79,6 +79,68 @@ def test_hls(subsonic: Subsonic, song: dict[str, Any]) -> None:
     assert parse.parse_qs(stream_url.query)["id"][0] == song["id"]
 
 
+@responses.activate
+def test_get_cover_art_with_a_given_filename(
+    tmp_path: Path,
+    output_cover_art_filename: str,
+    placeholder_data: str,
+    mock_download_file: MockDownload,
+    subsonic: Subsonic,
+    song: dict[str, Any],
+    cover_art_content_type: str,
+    cover_art_size: int,
+) -> None:
+    responses.add(
+        mock_download_file(
+            "getCoverArt",
+            {"id": song["coverArt"], "size": cover_art_size},
+            tmp_path,
+            cover_art_content_type,
+        )
+    )
+
+    download_path = subsonic.media_retrieval.get_cover_art(
+        song["coverArt"], tmp_path / output_cover_art_filename, cover_art_size
+    )
+
+    # Check if the file data has been unaltered
+    with open(tmp_path / output_cover_art_filename, "r") as file:
+        assert placeholder_data == file.read()
+
+    assert download_path == tmp_path / output_cover_art_filename
+
+
+@responses.activate
+def test_get_cover_art_without_a_given_filename(
+    tmp_path: Path,
+    default_cover_art_filename: str,
+    placeholder_data: str,
+    mock_download_file: MockDownload,
+    subsonic: Subsonic,
+    song: dict[str, Any],
+    cover_art_content_type: str,
+    cover_art_size: int,
+) -> None:
+    responses.add(
+        mock_download_file(
+            "getCoverArt",
+            {"id": song["coverArt"], "size": cover_art_size},
+            tmp_path,
+            cover_art_content_type,
+        )
+    )
+
+    download_path = subsonic.media_retrieval.get_cover_art(
+        song["coverArt"], tmp_path, cover_art_size
+    )
+
+    # Check if the file data has been unaltered
+    with open(tmp_path / default_cover_art_filename, "r") as file:
+        assert placeholder_data == file.read()
+
+    assert download_path == tmp_path / default_cover_art_filename
+
+
 @responses.activate
 def test_get_avatar_with_a_given_filename(
     tmp_path: Path,

tests/mocks/media_retrieval.py

@@ -54,6 +54,26 @@ def avatar_content_type() -> str:
     return "image/png"
 
 
+@pytest.fixture
+def default_cover_art_filename(song: dict[str, Any]) -> str:
+    return f"{song['coverArt']}.png"
+
+
+@pytest.fixture
+def output_cover_art_filename() -> str:
+    return "output.png"
+
+
+@pytest.fixture
+def cover_art_content_type() -> str:
+    return "image/png"
+
+
+@pytest.fixture
+def cover_art_size() -> int:
+    return 512
+
+
 @pytest.fixture
 def mock_download_file(
     placeholder_data: str,