/**
* GetMetadataExtension Handler - Read ABAP MetadataExtension via AdtClient
*
* Uses AdtClient.getMetadataExtension().read() for high-level read operation.
* Supports both active and inactive versions.
*/
import { AdtClient } from '@mcp-abap-adt/adt-clients';
import type { HandlerContext } from '../../../lib/handlers/interfaces';
import {
type AxiosResponse,
return_error,
return_response,
} from '../../../lib/utils';
export const TOOL_DEFINITION = {
name: 'GetMetadataExtension',
description:
'Retrieve ABAP metadata extension definition. Supports reading active or inactive version.',
inputSchema: {
type: 'object',
properties: {
metadata_extension_name: {
type: 'string',
description: 'MetadataExtension name (e.g., Z_MY_METADATAEXTENSION).',
},
version: {
type: 'string',
enum: ['active', 'inactive'],
description:
'Version to read: "active" (default) for deployed version, "inactive" for modified but not activated version.',
default: 'active',
},
},
required: ['metadata_extension_name'],
},
} as const;
interface GetMetadataExtensionArgs {
metadata_extension_name: string;
version?: 'active' | 'inactive';
}
/**
* Main handler for GetMetadataExtension MCP tool
*
* Uses AdtClient.getMetadataExtension().read() - high-level read operation
*/
export async function handleGetMetadataExtension(
context: HandlerContext,
args: GetMetadataExtensionArgs,
) {
const { connection, logger } = context;
try {
const { metadata_extension_name, version = 'active' } =
args as GetMetadataExtensionArgs;
// Validation
if (!metadata_extension_name) {
return return_error(new Error('metadata_extension_name is required'));
}
const client = new AdtClient(connection, logger);
const metadataExtensionName = metadata_extension_name.toUpperCase();
logger?.info(
`Reading metadata extension ${metadataExtensionName}, version: ${version}`,
);
try {
// Read metadata extension using AdtClient
const metadataExtensionObject = client.getMetadataExtension();
const readResult = await metadataExtensionObject.read(
{ name: metadataExtensionName },
version as 'active' | 'inactive',
);
if (!readResult || !readResult.readResult) {
throw new Error(`MetadataExtension ${metadataExtensionName} not found`);
}
// Extract data from read result
const metadataExtensionData =
typeof readResult.readResult.data === 'string'
? readResult.readResult.data
: JSON.stringify(readResult.readResult.data);
logger?.info(
`✅ GetMetadataExtension completed successfully: ${metadataExtensionName}`,
);
return return_response({
data: JSON.stringify(
{
success: true,
metadata_extension_name: metadataExtensionName,
version,
metadata_extension_data: metadataExtensionData,
status: readResult.readResult.status,
status_text: readResult.readResult.statusText,
},
null,
2,
),
} as AxiosResponse);
} catch (error: any) {
logger?.error(
`Error reading metadata extension ${metadataExtensionName}: ${error?.message || error}`,
);
// Parse error message
let errorMessage = `Failed to read metadata extension: ${error.message || String(error)}`;
if (error.response?.status === 404) {
errorMessage = `MetadataExtension ${metadataExtensionName} not found.`;
} else if (error.response?.status === 423) {
errorMessage = `MetadataExtension ${metadataExtensionName} is locked by another user.`;
}
return return_error(new Error(errorMessage));
}
} catch (error: any) {
return return_error(error);
}
}
