Add Google Gemini API Support (#1330)

* Supports Google Gemini API

* Fixed error when running svelte-check

* update: from the contribution of nsarrazin

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

@@ -44,6 +44,42 @@ MODELS=`[
         }
       }]
     }]
+  }
+]`
+```
+
+## GenAI
+
+Or use the Gemini API API provider [from](https://github.com/google-gemini/generative-ai-js#readme):
+
+> Make sure that you have an API key from Google Cloud Platform. To get an API key, follow the instructions [here](https://cloud.google.com/docs/authentication/api-keys).
+
+```ini
+MODELS=`[
+  {
+    "name": "gemini-1.5-flash",
+    "displayName": "Gemini Flash 1.5",
+    "multimodal": true,
+    "endpoints": [
+      {
+        "type": "genai",
+        "apiKey": "abc...xyz"
+      }
+    ]
+
+    // Optional
+    "safetyThreshold": "BLOCK_MEDIUM_AND_ABOVE",
   },
+  {
+    "name": "gemini-1.5-pro",
+    "displayName": "Gemini Pro 1.5",
+    "multimodal": false,
+    "endpoints": [
+      {
+        "type": "genai",
+        "apiKey": "abc...xyz"
+      }
+    ]
+  }
 ]`
 ```

package-lock.json

@@ -96,6 +96,7 @@
 				"@anthropic-ai/sdk": "^0.17.1",
 				"@anthropic-ai/vertex-sdk": "^0.3.0",
 				"@google-cloud/vertexai": "^1.1.0",
+				"@google/generative-ai": "^0.14.1",
 				"aws4fetch": "^1.0.17",
 				"cohere-ai": "^7.9.0",
 				"openai": "^4.44.0"
@@ -1360,6 +1361,15 @@
 				"node": ">=18.0.0"
 			}
 		},
+		"node_modules/@google/generative-ai": {
+			"version": "0.14.1",
+			"resolved": "https://registry.npmjs.org/@google/generative-ai/-/generative-ai-0.14.1.tgz",
+			"integrity": "sha512-pevEyZCb0Oc+dYNlSberW8oZBm4ofeTD5wN01TowQMhTwdAbGAnJMtQzoklh6Blq2AKsx8Ox6FWa44KioZLZiA==",
+			"optional": true,
+			"engines": {
+				"node": ">=18.0.0"
+			}
+		},
 		"node_modules/@gradio/client": {
 			"version": "0.19.4",
 			"resolved": "https://registry.npmjs.org/@gradio/client/-/client-0.19.4.tgz",

package.json

@@ -106,6 +106,7 @@
 		"@anthropic-ai/sdk": "^0.17.1",
 		"@anthropic-ai/vertex-sdk": "^0.3.0",
 		"@google-cloud/vertexai": "^1.1.0",
+		"@google/generative-ai": "^0.14.1",
 		"aws4fetch": "^1.0.17",
 		"cohere-ai": "^7.9.0",
 		"openai": "^4.44.0"

src/lib/server/endpoints/endpoints.ts

@@ -8,6 +8,7 @@ import { endpointOAIParametersSchema, endpointOai } from "./openai/endpointOai";
 import endpointLlamacpp, { endpointLlamacppParametersSchema } from "./llamacpp/endpointLlamacpp";
 import endpointOllama, { endpointOllamaParametersSchema } from "./ollama/endpointOllama";
 import endpointVertex, { endpointVertexParametersSchema } from "./google/endpointVertex";
+import endpointGenAI, { endpointGenAIParametersSchema } from "./google/endpointGenAI";
 
 import {
 	endpointAnthropic,
@@ -65,6 +66,7 @@ export const endpoints = {
 	llamacpp: endpointLlamacpp,
 	ollama: endpointOllama,
 	vertex: endpointVertex,
+	genai: endpointGenAI,
 	cloudflare: endpointCloudflare,
 	cohere: endpointCohere,
 	langserve: endpointLangserve,
@@ -79,6 +81,7 @@ export const endpointSchema = z.discriminatedUnion("type", [
 	endpointLlamacppParametersSchema,
 	endpointOllamaParametersSchema,
 	endpointVertexParametersSchema,
+	endpointGenAIParametersSchema,
 	endpointCloudflareParametersSchema,
 	endpointCohereParametersSchema,
 	endpointLangserveParametersSchema,

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

@@ -0,0 +1,171 @@
+import { GoogleGenerativeAI, HarmBlockThreshold, HarmCategory } from "@google/generative-ai";
+import type { Content, Part, TextPart } from "@google/generative-ai";
+import { z } from "zod";
+import type { Message, MessageFile } from "$lib/types/Message";
+import type { TextGenerationStreamOutput } from "@huggingface/inference";
+import type { Endpoint } from "../endpoints";
+import { createImageProcessorOptionsValidator, makeImageProcessor } from "../images";
+import type { ImageProcessorOptions } from "../images";
+
+export const endpointGenAIParametersSchema = z.object({
+	weight: z.number().int().positive().default(1),
+	model: z.any(),
+	type: z.literal("genai"),
+	apiKey: z.string(),
+	safetyThreshold: z
+		.enum([
+			HarmBlockThreshold.HARM_BLOCK_THRESHOLD_UNSPECIFIED,
+			HarmBlockThreshold.BLOCK_LOW_AND_ABOVE,
+			HarmBlockThreshold.BLOCK_MEDIUM_AND_ABOVE,
+			HarmBlockThreshold.BLOCK_NONE,
+			HarmBlockThreshold.BLOCK_ONLY_HIGH,
+		])
+		.optional(),
+	multimodal: z
+		.object({
+			image: createImageProcessorOptionsValidator({
+				supportedMimeTypes: ["image/png", "image/jpeg", "image/webp"],
+				preferredMimeType: "image/webp",
+				// The 4 / 3 compensates for the 33% increase in size when converting to base64
+				maxSizeInMB: (5 / 4) * 3,
+				maxWidth: 4096,
+				maxHeight: 4096,
+			}),
+		})
+		.default({}),
+});
+
+export function endpointGenAI(input: z.input<typeof endpointGenAIParametersSchema>): Endpoint {
+	const { model, apiKey, safetyThreshold, multimodal } = endpointGenAIParametersSchema.parse(input);
+
+	const genAI = new GoogleGenerativeAI(apiKey);
+
+	return async ({ messages, preprompt, generateSettings }) => {
+		const parameters = { ...model.parameters, ...generateSettings };
+
+		const generativeModel = genAI.getGenerativeModel({
+			model: model.id ?? model.name,
+			safetySettings: safetyThreshold
+				? [
+						{
+							category: HarmCategory.HARM_CATEGORY_DANGEROUS_CONTENT,
+							threshold: safetyThreshold,
+						},
+						{
+							category: HarmCategory.HARM_CATEGORY_HARASSMENT,
+							threshold: safetyThreshold,
+						},
+						{
+							category: HarmCategory.HARM_CATEGORY_HATE_SPEECH,
+							threshold: safetyThreshold,
+						},
+						{
+							category: HarmCategory.HARM_CATEGORY_SEXUALLY_EXPLICIT,
+							threshold: safetyThreshold,
+						},
+						{
+							category: HarmCategory.HARM_CATEGORY_UNSPECIFIED,
+							threshold: safetyThreshold,
+						},
+				  ]
+				: undefined,
+			generationConfig: {
+				maxOutputTokens: parameters?.max_new_tokens ?? 4096,
+				stopSequences: parameters?.stop,
+				temperature: parameters?.temperature ?? 1,
+			},
+		});
+
+		let systemMessage = preprompt;
+		if (messages[0].from === "system") {
+			systemMessage = messages[0].content;
+			messages.shift();
+		}
+
+		const genAIMessages = await Promise.all(
+			messages.map(async ({ from, content, files }: Omit<Message, "id">): Promise<Content> => {
+				return {
+					role: from === "user" ? "user" : "model",
+					parts: [
+						...(await Promise.all(
+							(files ?? []).map((file) => fileToImageBlock(file, multimodal.image))
+						)),
+						{ text: content },
+					],
+				};
+			})
+		);
+
+		const result = await generativeModel.generateContentStream({
+			contents: genAIMessages,
+			systemInstruction:
+				systemMessage && systemMessage.trim() !== ""
+					? {
+							role: "system",
+							parts: [{ text: systemMessage }],
+					  }
+					: undefined,
+		});
+
+		let tokenId = 0;
+		return (async function* () {
+			let generatedText = "";
+
+			for await (const data of result.stream) {
+				if (!data?.candidates?.length) break; // Handle case where no candidates are present
+
+				const candidate = data.candidates[0];
+				if (!candidate.content?.parts?.length) continue; // Skip if no parts are present
+
+				const firstPart = candidate.content.parts.find((part) => "text" in part) as
+					| TextPart
+					| undefined;
+				if (!firstPart) continue; // Skip if no text part is found
+
+				const content = firstPart.text;
+				generatedText += content;
+
+				const output: TextGenerationStreamOutput = {
+					token: {
+						id: tokenId++,
+						text: content,
+						logprob: 0,
+						special: false,
+					},
+					generated_text: null,
+					details: null,
+				};
+				yield output;
+			}
+
+			const output: TextGenerationStreamOutput = {
+				token: {
+					id: tokenId++,
+					text: "",
+					logprob: 0,
+					special: true,
+				},
+				generated_text: generatedText,
+				details: null,
+			};
+			yield output;
+		})();
+	};
+}
+
+async function fileToImageBlock(
+	file: MessageFile,
+	opts: ImageProcessorOptions<"image/png" | "image/jpeg" | "image/webp">
+): Promise<Part> {
+	const processor = makeImageProcessor(opts);
+	const { image, mime } = await processor(file);
+
+	return {
+		inlineData: {
+			mimeType: mime,
+			data: image.toString("base64"),
+		},
+	};
+}
+
+export default endpointGenAI;

src/lib/server/models.ts

@@ -230,6 +230,8 @@ const addEndpoint = (m: Awaited<ReturnType<typeof processModel>>) => ({
 						return endpoints.ollama(args);
 					case "vertex":
 						return await endpoints.vertex(args);
+					case "genai":
+						return await endpoints.genai(args);
 					case "cloudflare":
 						return await endpoints.cloudflare(args);
 					case "cohere":