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lfeat: Add dynamic model discovery from provider APIs #889

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73 changes: 73 additions & 0 deletions python/api/settings_refresh_models.py
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Original file line number Diff line number Diff line change
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from typing import Any

import models as models_module
from python.helpers.api import ApiHandler, Request, Response
from python.helpers.model_discovery import (
get_models_for_provider,
clear_cache,
)

# Placeholder used for masked API keys in UI
API_KEY_PLACEHOLDER = "************"


class RefreshModels(ApiHandler):
"""
API endpoint to dynamically fetch model options from provider APIs.

Called when:
- User changes the provider dropdown
- User enters/updates an API key
- User explicitly requests a refresh

Input:
model_type: "chat" or "embedding"
provider: Provider ID (e.g., "openai", "anthropic", "openrouter")
api_keys: Dictionary of API keys (may contain placeholders)
api_base: Optional custom API base URL for OpenAI-compatible providers
force_refresh: Optional, if True bypasses cache
clear_cache: Optional, if True clears all cache first

Returns:
models: List of {value, label} options fetched from the provider's API
"""

async def process(
self, input: dict[Any, Any], request: Request
) -> dict[Any, Any] | Response:
model_type = input.get("model_type", "chat")
provider = input.get("provider", "")
api_keys_input = input.get("api_keys", {})
api_base = input.get("api_base", "")
force_refresh = input.get("force_refresh", False)
should_clear_cache = input.get("clear_cache", False)

# Handle cache clear request
if should_clear_cache:
clear_cache()

if not provider:
return {"models": [{"value": "__custom__", "label": "Custom (enter manually)"}]}

# Resolve actual API keys from environment when placeholders are passed
api_keys = {}
for prov, key in api_keys_input.items():
if key == API_KEY_PLACEHOLDER or not key:
# Get actual key from environment
actual_key = models_module.get_api_key(prov)
if actual_key and actual_key != "None":
api_keys[prov] = actual_key
else:
# Use the provided key (user may have just entered a new one)
api_keys[prov] = key

# Fetch models dynamically from provider API
models = await get_models_for_provider(
model_type=model_type,
provider=provider,
api_keys=api_keys,
api_base=api_base if api_base else None,
force_refresh=force_refresh,
)

return {"models": models}
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