feat(hosted_vllm): add image edit support

Register a HostedVLLMImageEditConfig so hosted_vllm/<model> deployments route POST /v1/images/edits to the vLLM-Omni OpenAI-compatible endpoint instead of failing with 'image edit is not supported for hosted_vllm' before any request is sent

litellm/llms/hosted_vllm/image_edit/__init__.py

@@ -0,0 +1,9 @@
+from litellm.llms.base_llm.image_edit.transformation import BaseImageEditConfig
+
+from .transformation import HostedVLLMImageEditConfig
+
+__all__ = ("HostedVLLMImageEditConfig",)
+
+
+def get_hosted_vllm_image_edit_config(model: str) -> BaseImageEditConfig:
+    return HostedVLLMImageEditConfig()

litellm/llms/hosted_vllm/image_edit/transformation.py

@@ -0,0 +1,42 @@
+"""Image edits for Hosted VLLM (vLLM-Omni OpenAI-compatible /v1/images/edits)."""
+
+from typing import Final
+
+from litellm.llms.openai.image_edit.transformation import OpenAIImageEditConfig
+from litellm.secret_managers.main import get_secret_str
+
+
+class HostedVLLMImageEditConfig(OpenAIImageEditConfig):
+    """
+    vLLM-Omni images edits API follows the OpenAI multipart contract.
+
+    https://docs.vllm.ai/projects/vllm-omni/en/latest/serving/images_api/
+    """
+
+    def validate_environment(
+        self,
+        headers: dict,  # mutable-ok: BaseImageEditConfig contract
+        model: str,
+        api_key: str | None = None,
+        litellm_params: dict | None = None,  # mutable-ok: BaseImageEditConfig contract
+        api_base: str | None = None,
+    ) -> dict:  # mutable-ok: BaseImageEditConfig contract
+        resolved_key: Final = api_key or get_secret_str("HOSTED_VLLM_API_KEY") or "fake-api-key"
+        return {**headers, "Authorization": f"Bearer {resolved_key}"}  # mutable-ok: httpx headers are a dict
+
+    def get_complete_url(
+        self,
+        model: str,
+        api_base: str | None,
+        litellm_params: dict,  # mutable-ok: BaseImageEditConfig contract
+    ) -> str:
+        resolved_api_base: Final = api_base or get_secret_str("HOSTED_VLLM_API_BASE")
+        if resolved_api_base is None:
+            raise ValueError(
+                "api_base not set for Hosted VLLM images edits API. "
+                "Set via api_base parameter or HOSTED_VLLM_API_BASE environment variable"
+            )
+        trimmed: Final = resolved_api_base.rstrip("/")
+        if trimmed.endswith("/v1"):
+            return f"{trimmed}/images/edits"
+        return f"{trimmed}/v1/images/edits"

litellm/utils.py

@@ -9239,6 +9239,10 @@ class ProviderConfigManager:
             from litellm.llms.openai.image_edit import get_openai_image_edit_config
 
             return get_openai_image_edit_config(model=model)
+        if LlmProviders.HOSTED_VLLM == provider:
+            from litellm.llms.hosted_vllm.image_edit import get_hosted_vllm_image_edit_config
+
+            return get_hosted_vllm_image_edit_config(model=model)
         elif LlmProviders.AZURE == provider:
             from litellm.llms.azure.image_edit.transformation import (
                 AzureImageEditConfig,

tests/test_litellm/llms/hosted_vllm/image_edit/test_hosted_vllm_image_edit_transformation.py

@@ -0,0 +1,114 @@
+"""Tests for hosted_vllm image edits (vLLM-Omni /v1/images/edits)."""
+
+import httpx
+import pytest
+
+import litellm
+from litellm.llms.custom_httpx.http_handler import HTTPHandler
+from litellm.llms.hosted_vllm.image_edit import get_hosted_vllm_image_edit_config
+from litellm.llms.hosted_vllm.image_edit.transformation import HostedVLLMImageEditConfig
+from litellm.types.utils import LlmProviders
+from litellm.utils import ProviderConfigManager
+
+PNG_BYTES = b"\x89PNG\r\n\x1a\nfakepng"
+MODEL = "Qwen/Qwen-Image-Edit-2511"
+
+
+@pytest.fixture(autouse=True)
+def _clear_hosted_vllm_env(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("HOSTED_VLLM_API_KEY", raising=False)
+    monkeypatch.delenv("HOSTED_VLLM_API_BASE", raising=False)
+
+
+def test_provider_config_registration():
+    config = ProviderConfigManager.get_provider_image_edit_config(
+        model=f"hosted_vllm/{MODEL}",
+        provider=LlmProviders.HOSTED_VLLM,
+    )
+
+    assert isinstance(config, HostedVLLMImageEditConfig)
+    assert isinstance(get_hosted_vllm_image_edit_config(MODEL), HostedVLLMImageEditConfig)
+
+
+@pytest.mark.parametrize(
+    "api_base",
+    ["http://localhost:8091", "http://localhost:8091/", "http://localhost:8091/v1", "http://localhost:8091/v1/"],
+)
+def test_get_complete_url_appends_images_edits(api_base: str):
+    config = HostedVLLMImageEditConfig()
+
+    assert (
+        config.get_complete_url(model=MODEL, api_base=api_base, litellm_params={})
+        == "http://localhost:8091/v1/images/edits"
+    )
+
+
+def test_get_complete_url_falls_back_to_env(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("HOSTED_VLLM_API_BASE", "http://vllm-omni:8000/v1")
+    config = HostedVLLMImageEditConfig()
+
+    assert (
+        config.get_complete_url(model=MODEL, api_base=None, litellm_params={})
+        == "http://vllm-omni:8000/v1/images/edits"
+    )
+
+
+def test_get_complete_url_requires_api_base():
+    config = HostedVLLMImageEditConfig()
+
+    with pytest.raises(ValueError, match="api_base not set"):
+        config.get_complete_url(model=MODEL, api_base=None, litellm_params={})
+
+
+def test_validate_environment_defaults_to_fake_api_key():
+    headers = HostedVLLMImageEditConfig().validate_environment(headers={}, model=MODEL)
+
+    assert headers == {"Authorization": "Bearer fake-api-key"}
+
+
+def test_validate_environment_uses_provided_api_key_and_keeps_headers():
+    headers = HostedVLLMImageEditConfig().validate_environment(
+        headers={"X-Test": "1"},
+        model=MODEL,
+        api_key="my-custom-key",
+    )
+
+    assert headers == {"X-Test": "1", "Authorization": "Bearer my-custom-key"}
+
+
+def test_validate_environment_falls_back_to_env_api_key(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("HOSTED_VLLM_API_KEY", "env-key")
+
+    headers = HostedVLLMImageEditConfig().validate_environment(headers={}, model=MODEL)
+
+    assert headers["Authorization"] == "Bearer env-key"
+
+
+def test_image_edit_posts_multipart_to_vllm_omni():
+    captured: list[httpx.Request] = []
+
+    def handler(request: httpx.Request) -> httpx.Response:
+        captured.append(request)
+        return httpx.Response(200, json={"created": 1712697600, "data": [{"b64_json": "aW1n"}]})
+
+    response = litellm.image_edit(
+        model=f"hosted_vllm/{MODEL}",
+        image=PNG_BYTES,
+        prompt="add a hat",
+        api_base="http://localhost:8091",
+        api_key="test-key",
+        client=HTTPHandler(client=httpx.Client(transport=httpx.MockTransport(handler))),
+        seed=42,
+    )
+
+    assert response.data
+    assert len(captured) == 1
+    request = captured[0]
+    assert str(request.url) == "http://localhost:8091/v1/images/edits"
+    assert request.headers["authorization"] == "Bearer test-key"
+    assert request.headers["content-type"].startswith("multipart/form-data")
+    assert b'name="image[]"' in request.content
+    assert PNG_BYTES in request.content
+    assert f'name="model"\r\n\r\n{MODEL}'.encode() in request.content
+    assert b'name="prompt"\r\n\r\nadd a hat' in request.content
+    assert b'name="seed"\r\n\r\n42' in request.content