Add Google Vertex AI credential support to GoogleVertexAI node

packages/components/credentials/GoogleAuth.credential.ts

@@ -0,0 +1,55 @@
+import { INodeParams, INodeCredential } from '../src/Interface'
+
+class GoogleVertexAuth implements INodeCredential {
+    label: string
+    name: string
+    version: number
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Google Vertex Auth'
+        this.name = 'googleVertexAuth'
+        this.version = 1.0
+        this.inputs = [
+            {
+                label: 'Google Application Credential File Path',
+                name: 'googleApplicationCredentialFilePath',
+                description:
+                    'Path to your google application credential json file. You can also use the credential JSON object (either one)',
+                placeholder: 'your-path/application_default_credentials.json',
+                type: 'string',
+                optional: true
+            },
+            {
+                label: 'Google Credential JSON Object',
+                name: 'googleApplicationCredential',
+                description: 'JSON object of your google application credential. You can also use the file path (either one)',
+                placeholder: `{
+    "type": ...,
+    "project_id": ...,
+    "private_key_id": ...,
+    "private_key": ...,
+    "client_email": ...,
+    "client_id": ...,
+    "auth_uri": ...,
+    "token_uri": ...,
+    "auth_provider_x509_cert_url": ...,
+    "client_x509_cert_url": ...
+}`,
+                type: 'string',
+                rows: 4,
+                optional: true
+            },
+            {
+                label: 'Project ID',
+                name: 'projectID',
+                description: 'Project ID of GCP. If not provided, it will be read from the credential file',
+                type: 'string',
+                optional: true,
+                additionalParams: true
+            }
+        ]
+    }
+}
+
+module.exports = { credClass: GoogleVertexAuth }

packages/components/nodes/chatmodels/GoogleVertexAI/GoogleVertexAI.ts

@@ -1,6 +1,7 @@
-import { INode, INodeData, INodeParams } from '../../../src/Interface'
-import { getBaseClasses } from '../../../src/utils'
+import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses, getCredentialData, getCredentialParam } from '../../../src/utils'
 import { ChatGoogleVertexAI, GoogleVertexAIChatInput } from 'langchain/chat_models/googlevertexai'
+import { GoogleAuthOptions } from 'google-auth-library'
 
 class GoogleVertexAI_ChatModels implements INode {
     label: string
@@ -23,6 +24,12 @@ class GoogleVertexAI_ChatModels implements INode {
         this.category = 'Chat Models'
         this.description = 'Wrapper around VertexAI large language models that use the Chat endpoint'
         this.baseClasses = [this.type, ...getBaseClasses(ChatGoogleVertexAI)]
+        this.credential = {
+            label: 'Connect Credential',
+            name: 'credential',
+            type: 'credential',
+            credentialNames: ['googleVertexAuth']
+        }
         this.inputs = [
             {
                 label: 'Model Name',
@@ -68,22 +75,40 @@ class GoogleVertexAI_ChatModels implements INode {
         ]
     }
 
-    async init(nodeData: INodeData, _: string): Promise<any> {
+    async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
+        const credentialData = await getCredentialData(nodeData.credential ?? '', options)
+        const googleApplicationCredentialFilePath = getCredentialParam('googleApplicationCredentialFilePath', credentialData, nodeData)
+        const googleApplicationCredential = getCredentialParam('googleApplicationCredential', credentialData, nodeData)
+        const projectID = getCredentialParam('projectID', credentialData, nodeData)
+
+        if (!googleApplicationCredentialFilePath && !googleApplicationCredential)
+            throw new Error('Please specify your Google Application Credential')
+        if (googleApplicationCredentialFilePath && googleApplicationCredential)
+            throw new Error('Please use either Google Application Credential File Path or Google Credential JSON Object')
+
+        const authOptions: GoogleAuthOptions = {}
+        if (googleApplicationCredentialFilePath && !googleApplicationCredential) authOptions.keyFile = googleApplicationCredentialFilePath
+        else if (!googleApplicationCredentialFilePath && googleApplicationCredential)
+            authOptions.credentials = JSON.parse(googleApplicationCredential)
+
+        if (projectID) authOptions.projectId = projectID
+
         const temperature = nodeData.inputs?.temperature as string
-        const model = nodeData.inputs?.modelName as string
+        const modelName = nodeData.inputs?.modelName as string
         const maxOutputTokens = nodeData.inputs?.maxOutputTokens as string
         const topP = nodeData.inputs?.topP as string
 
         const obj: Partial<GoogleVertexAIChatInput> = {
             temperature: parseFloat(temperature),
-            model
+            model: modelName,
+            authOptions
         }
 
         if (maxOutputTokens) obj.maxOutputTokens = parseInt(maxOutputTokens, 10)
         if (topP) obj.topP = parseFloat(topP)
 
-        const chat_model = new ChatGoogleVertexAI(obj)
-        return chat_model
+        const model = new ChatGoogleVertexAI(obj)
+        return model
     }
 }
 

packages/components/package.json

@@ -39,7 +39,7 @@
         "google-auth-library": "^9.0.0",
         "graphql": "^16.6.0",
         "html-to-text": "^9.0.5",
-        "langchain": "^0.0.117",
+        "langchain": "^0.0.122",
         "linkifyjs": "^4.1.1",
         "mammoth": "^1.5.1",
         "moment": "^2.29.3",