Add support for model version in Vertex AI (#1496)

* Add support for model version in Vertex AI

* Update src/lib/server/endpoints/google/endpointVertex.ts

Co-authored-by: goupilew <[email protected]>

* fix: optional chaining on extraBody

---------

Co-authored-by: goupilew <[email protected]>
Co-authored-by: Nathan Sarrazin <[email protected]>

docs/source/configuration/models/providers/google.md

@@ -33,8 +33,9 @@ MODELS=`[
       "type": "vertex",
       "project": "abc-xyz",
       "location": "europe-west3",
-      "model": "gemini-1.5-pro-preview-0409", // model-name
-
+      "extraBody": {
+         "model_version": "gemini-1.5-pro-002",
+      },
       // Optional
       "safetyThreshold": "BLOCK_MEDIUM_AND_ABOVE",
       "apiEndpoint": "", // alternative api endpoint url,

src/lib/server/endpoints/google/endpointVertex.ts

@@ -16,6 +16,7 @@ export const endpointVertexParametersSchema = z.object({
 	model: z.any(), // allow optional and validate against emptiness
 	type: z.literal("vertex"),
 	location: z.string().default("europe-west1"),
+	extraBody: z.object({ model_version: z.string() }).optional(),
 	project: z.string(),
 	apiEndpoint: z.string().optional(),
 	safetyThreshold: z
@@ -49,7 +50,7 @@ export const endpointVertexParametersSchema = z.object({
 });
 
 export function endpointVertex(input: z.input<typeof endpointVertexParametersSchema>): Endpoint {
-	const { project, location, model, apiEndpoint, safetyThreshold, tools, multimodal } =
+	const { project, location, model, apiEndpoint, safetyThreshold, tools, multimodal, extraBody } =
 		endpointVertexParametersSchema.parse(input);
 
 	const vertex_ai = new VertexAI({
@@ -64,7 +65,7 @@ export function endpointVertex(input: z.input<typeof endpointVertexParametersSch
 		const hasFiles = messages.some((message) => message.files && message.files.length > 0);
 
 		const generativeModel = vertex_ai.getGenerativeModel({
-			model: model.id ?? model.name,
+			model: extraBody?.model_version ?? model.id ?? model.name,
 			safetySettings: safetyThreshold
 				? [
 						{