Function decodeContentBlock

packages/runtime-host/src/protocol/client-capability.ts:838–919

(value: unknown)

}

function decodeContentBlock(value: unknown): ClientCapabilityContentBlock {
  const record = requireRecord(value, 'Client Capability content block');
  switch (record.type) {
    case 'text':
      assertExactKeys(record, 'Client Capability text block', ['type', 'text']);
      return {
        type: 'text',
        text: requireBoundedString(record.text, 'text', CLIENT_CAPABILITY_MAX_RESULT_BYTES),
      };
    case 'image':
    case 'audio':
      assertExactKeys(record, `Client Capability ${record.type} block`, [
        'type',
        'data',
        'mimeType',
      ]);
      const data = requireBoundedString(record.data, 'data', CLIENT_CAPABILITY_MAX_RESULT_BYTES);
      if (!isCanonicalBase64(data)) {
        throw invalidProtocolFrame(`Invalid Client Capability ${record.type} data`);
      }
      return {
        type: record.type,
        data,
        mimeType:
          record.type === 'image'
            ? requireImageMimeType(record.mimeType)
            : requireString(record.mimeType, 'mimeType', 256),
      };
    case 'resource':
      assertOptionalExactKeys(
        record,
        'Client Capability resource block',
        ['type', 'uri'],
        ['mimeType', 'text', 'blob'],
      );
      return {
        type: 'resource',
        uri: requireString(record.uri, 'uri', 4_096),
        ...(record.mimeType === undefined
          ? {}
          : { mimeType: requireString(record.mimeType, 'mimeType', 256) }),
        ...(record.text === undefined
          ? {}
          : {
              text: requireBoundedString(record.text, 'text', CLIENT_CAPABILITY_MAX_RESULT_BYTES),
            }),
        ...(record.blob === undefined
          ? {}
          : {
              blob: requireCanonicalBase64(record.blob, 'blob', CLIENT_CAPABILITY_MAX_RESULT_BYTES),
            }),
      };
    case 'resource_link':
      assertOptionalExactKeys(
        record,
        'Client Capability resource link block',
        ['type', 'uri'],
        ['name', 'description', 'mimeType'],