Refactor GoogleAuth.credential to support both file path and JSON object credentials. Update GoogleVertexAIEmbedding to handle both cases

packages/components/credentials/GoogleAuth.credential.ts

@@ -14,9 +14,31 @@ class GoogleVertexAuth implements INodeCredential {
             {
                 label: 'Google Application Credential File Path',
                 name: 'googleApplicationCredentialFilePath',
-                description: 'Path to your google application credential json file',
+                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'
+                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',

packages/components/nodes/embeddings/GoogleVertexAIEmbedding/GoogleVertexAIEmbedding.ts

@@ -36,12 +36,18 @@ class GoogleVertexAIEmbedding_Embeddings implements INode {
     async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
         const credentialData = await getCredentialData(nodeData.credential ?? '', options)
         const googleApplicationCredentialFilePath = getCredentialParam('googleApplicationCredentialFilePath', credentialData, nodeData)
-        if (!googleApplicationCredentialFilePath) throw new Error('Please specify your Google Application Credential file path')
+        const googleApplicationCredential = getCredentialParam('googleApplicationCredential', credentialData, nodeData)
         const projectID = getCredentialParam('projectID', credentialData, nodeData)
 
-        const authOptions: GoogleAuthOptions = {
+        if (!googleApplicationCredentialFilePath && !googleApplicationCredential)
-            keyFile: googleApplicationCredentialFilePath
+            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