Refactor google credentials into a shared function (#4893)

packages/components/src/google-utils.ts

@@ -0,0 +1,29 @@
+import { getCredentialData, getCredentialParam, type ICommonObject, type INodeData } from '.'
+import type { ChatVertexAIInput, VertexAIInput } from '@langchain/google-vertexai'
+
+type SupportedAuthOptions = ChatVertexAIInput['authOptions'] | VertexAIInput['authOptions']
+
+export const buildGoogleCredentials = async (nodeData: INodeData, options: ICommonObject): Promise<SupportedAuthOptions | null> => {
+    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)
+
+    const authOptions: any = {}
+    if (Object.keys(credentialData).length !== 0) {
+        if (!googleApplicationCredentialFilePath && !googleApplicationCredential)
+            throw new Error('Please specify your Google Application Credential')
+        if (!googleApplicationCredentialFilePath && !googleApplicationCredential)
+            throw new Error(
+                'Error: More than one component has been inputted. Please use only one of the following: Google Application Credential File Path or Google Credential JSON Object'
+            )
+
+        if (googleApplicationCredentialFilePath && !googleApplicationCredential) authOptions.keyFile = googleApplicationCredentialFilePath
+        else if (!googleApplicationCredentialFilePath && googleApplicationCredential)
+            authOptions.credentials = JSON.parse(googleApplicationCredential)
+
+        if (projectID) authOptions.projectId = projectID
+    }
+
+    return authOptions
+}