first commit

packages/@n8n/nodes-langchain/utils/schemaParsing.ts

@@ -0,0 +1,63 @@
+import { jsonSchemaToZod } from '@n8n/json-schema-to-zod';
+import { json as generateJsonSchema } from 'generate-schema';
+import type { SchemaObject } from 'generate-schema';
+import type { JSONSchema7 } from 'json-schema';
+import type { IExecuteFunctions } from 'n8n-workflow';
+import { NodeOperationError, jsonParse } from 'n8n-workflow';
+import type { z } from 'zod';
+
+function makeAllPropertiesRequired(schema: JSONSchema7): JSONSchema7 {
+	function isPropertySchema(property: unknown): property is JSONSchema7 {
+		return typeof property === 'object' && property !== null && 'type' in property;
+	}
+
+	// Handle object properties
+	if (schema.type === 'object' && schema.properties) {
+		const properties = Object.keys(schema.properties);
+		if (properties.length > 0) {
+			schema.required = properties;
+		}
+
+		for (const key of properties) {
+			if (isPropertySchema(schema.properties[key])) {
+				makeAllPropertiesRequired(schema.properties[key]);
+			}
+		}
+	}
+
+	// Handle arrays
+	if (schema.type === 'array' && schema.items && isPropertySchema(schema.items)) {
+		schema.items = makeAllPropertiesRequired(schema.items);
+	}
+
+	return schema;
+}
+
+export function generateSchemaFromExample(
+	exampleJsonString: string,
+	allFieldsRequired = false,
+): JSONSchema7 {
+	const parsedExample = jsonParse<SchemaObject>(exampleJsonString);
+
+	const schema = generateJsonSchema(parsedExample) as JSONSchema7;
+
+	if (allFieldsRequired) {
+		return makeAllPropertiesRequired(schema);
+	}
+
+	return schema;
+}
+
+export function convertJsonSchemaToZod<T extends z.ZodTypeAny = z.ZodTypeAny>(schema: JSONSchema7) {
+	return jsonSchemaToZod<T>(schema);
+}
+
+export function throwIfToolSchema(ctx: IExecuteFunctions, error: Error) {
+	if (error?.message?.includes('tool input did not match expected schema')) {
+		throw new NodeOperationError(
+			ctx.getNode(),
+			`${error.message}.
+			This is most likely because some of your tools are configured to require a specific schema. This is not supported by Conversational Agent. Remove the schema from the tool configuration or use Tools agent instead.`,
+		);
+	}
+}