feat(Google Vertex Chat Model Node): Add support for Google Vertex AI Chat models (#9970)

Co-authored-by: oleg <oleg@n8n.io>

packages/@n8n/nodes-langchain/nodes/llms/gemini-common/additional-options.ts

@@ -0,0 +1,87 @@
+import type { HarmBlockThreshold, HarmCategory } from '@google/generative-ai';
+import type { INodeProperties } from 'n8n-workflow';
+import { harmCategories, harmThresholds } from './safety-options';
+
+export const additionalOptions: INodeProperties = {
+	displayName: 'Options',
+	name: 'options',
+	placeholder: 'Add Option',
+	description: 'Additional options to add',
+	type: 'collection',
+	default: {},
+	options: [
+		{
+			displayName: 'Maximum Number of Tokens',
+			name: 'maxOutputTokens',
+			default: 2048,
+			description: 'The maximum number of tokens to generate in the completion',
+			type: 'number',
+		},
+		{
+			displayName: 'Sampling Temperature',
+			name: 'temperature',
+			default: 0.4,
+			typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
+			description:
+				'Controls randomness: Lowering results in less random completions. As the temperature approaches zero, the model will become deterministic and repetitive.',
+			type: 'number',
+		},
+		{
+			displayName: 'Top K',
+			name: 'topK',
+			default: 32,
+			typeOptions: { maxValue: 40, minValue: -1, numberPrecision: 1 },
+			description:
+				'Used to remove "long tail" low probability responses. Defaults to -1, which disables it.',
+			type: 'number',
+		},
+		{
+			displayName: 'Top P',
+			name: 'topP',
+			default: 1,
+			typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
+			description:
+				'Controls diversity via nucleus sampling: 0.5 means half of all likelihood-weighted options are considered. We generally recommend altering this or temperature but not both.',
+			type: 'number',
+		},
+
+		// Safety Settings
+		{
+			displayName: 'Safety Settings',
+			name: 'safetySettings',
+			type: 'fixedCollection',
+			typeOptions: { multipleValues: true },
+			default: {
+				values: {
+					category: harmCategories[0].name as HarmCategory,
+					threshold: harmThresholds[0].name as HarmBlockThreshold,
+				},
+			},
+			placeholder: 'Add Option',
+			options: [
+				{
+					name: 'values',
+					displayName: 'Values',
+					values: [
+						{
+							displayName: 'Safety Category',
+							name: 'category',
+							type: 'options',
+							description: 'The category of harmful content to block',
+							default: 'HARM_CATEGORY_UNSPECIFIED',
+							options: harmCategories,
+						},
+						{
+							displayName: 'Safety Threshold',
+							name: 'threshold',
+							type: 'options',
+							description: 'The threshold of harmful content to block',
+							default: 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+							options: harmThresholds,
+						},
+					],
+				},
+			],
+		},
+	],
+};

packages/@n8n/nodes-langchain/nodes/llms/gemini-common/safety-options.ts

@@ -0,0 +1,52 @@
+import type { INodePropertyOptions } from 'n8n-workflow';
+
+export const harmCategories: INodePropertyOptions[] = [
+	{
+		value: 'HARM_CATEGORY_HARASSMENT',
+		name: 'HARM_CATEGORY_HARASSMENT',
+		description: 'Harassment content',
+	},
+	{
+		value: 'HARM_CATEGORY_HATE_SPEECH',
+		name: 'HARM_CATEGORY_HATE_SPEECH',
+		description: 'Hate speech and content',
+	},
+	{
+		value: 'HARM_CATEGORY_SEXUALLY_EXPLICIT',
+		name: 'HARM_CATEGORY_SEXUALLY_EXPLICIT',
+		description: 'Sexually explicit content',
+	},
+	{
+		value: 'HARM_CATEGORY_DANGEROUS_CONTENT',
+		name: 'HARM_CATEGORY_DANGEROUS_CONTENT',
+		description: 'Dangerous content',
+	},
+];
+
+export const harmThresholds: INodePropertyOptions[] = [
+	{
+		value: 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+		name: 'HARM_BLOCK_THRESHOLD_UNSPECIFIED',
+		description: 'Threshold is unspecified',
+	},
+	{
+		value: 'BLOCK_LOW_AND_ABOVE',
+		name: 'BLOCK_LOW_AND_ABOVE',
+		description: 'Content with NEGLIGIBLE will be allowed',
+	},
+	{
+		value: 'BLOCK_MEDIUM_AND_ABOVE',
+		name: 'BLOCK_MEDIUM_AND_ABOVE',
+		description: 'Content with NEGLIGIBLE and LOW will be allowed',
+	},
+	{
+		value: 'BLOCK_ONLY_HIGH',
+		name: 'BLOCK_ONLY_HIGH',
+		description: 'Content with NEGLIGIBLE, LOW, and MEDIUM will be allowed',
+	},
+	{
+		value: 'BLOCK_NONE',
+		name: 'BLOCK_NONE',
+		description: 'All content will be allowed',
+	},
+];