OAI: Allow /v1/encode endpoint to handle vision requests

* More robust checks for OAI chat completion message lists on /v1/encode endpoint
* Added TODO to support other aspects of chat completions
* Fix oversight where embeddings was not defined in advance on /v1/chat/completions endpoint

endpoints/core/router.py

@@ -1,6 +1,7 @@
 import asyncio
 import pathlib
 from sys import maxsize
+from common.multimodal import MultimodalEmbeddingWrapper
 from fastapi import APIRouter, Depends, HTTPException, Request, Response
 from sse_starlette import EventSourceResponse
 
@@ -357,10 +358,27 @@ async def unload_embedding_model():
 )
 async def encode_tokens(data: TokenEncodeRequest) -> TokenEncodeResponse:
     """Encodes a string or chat completion messages into tokens."""
+    embeddings = MultimodalEmbeddingWrapper()
 
     if isinstance(data.text, str):
         text = data.text
-    else:
+    elif isinstance(data.text, list) and "oai" in config.network.api_servers:
+        # TODO: Support additional chat completion args for encode
+        # i.e. add_generation_prompt, template selection, tool args, template kwargs
+        if model.container.prompt_template is None:
+            error_message = handle_request_error(
+                "Tokenization of chat completion requests is disabled "
+                "because a prompt template is not set.",
+                exc_info=False,
+            ).error.message
+
+            raise HTTPException(422, error_message)
+
+        from endpoints.OAI.utils.chat_completion import preprocess_vision_request
+
+        if model.container.use_vision:
+            data.text, embeddings = await preprocess_vision_request(data.text)
+
         special_tokens_dict = model.container.get_special_tokens(
             unwrap(data.add_bos_token, True)
         )
@@ -371,9 +389,16 @@ async def encode_tokens(data: TokenEncodeRequest) -> TokenEncodeResponse:
             **special_tokens_dict,
         }
 
-        text, _ = model.container.prompt_template.render(template_vars)
+        text = await model.container.prompt_template.render(template_vars)
+    else:
+        error_message = handle_request_error(
+            "OAI API server must be enabled to handle chat completion message inputs.",
+            exc_info=False,
+        ).error.message
 
-    raw_tokens = model.container.encode_tokens(text, **data.get_params())
+        raise HTTPException(422, error_message)
+
+    raw_tokens = model.container.encode_tokens(text, embeddings, **data.get_params())
     tokens = unwrap(raw_tokens, [])
     response = TokenEncodeResponse(tokens=tokens, length=len(tokens))
 

endpoints/core/types/token.py

@@ -23,7 +23,7 @@ class CommonTokenRequest(BaseModel):
 class TokenEncodeRequest(CommonTokenRequest):
     """Represents a tokenization request."""
 
-    text: Union[str, List[Dict[str, str]]]
+    text: Union[str, List[Dict]]
 
 
 class TokenEncodeResponse(BaseModel):