@juspay/neurolink/dist/observability/langfuseMasking.js

The pipe layer of an AI nervous system: one interface connecting provider neurons to your application, across three inference types — generate, stream and decide. `decide` returns typed, calibrated judgements from a non-generative model (~400ms, ~$0.00002

import { CONTENT_KEYS, FULLY_MASKED, METADATA_PREFIXES, } from "../constants/langfuse.js";
function parseContent(value) {
    const text = typeof value === "string" ? value : JSON.stringify(value);
    try {
        return JSON.parse(text);
    }
    catch {
        return text ?? null;
    }
}
function maskValue(value, mask) {
    try {
        const masked = mask?.({ data: parseContent(value) });
        return typeof masked === "string" ? masked : JSON.stringify(masked);
    }
    catch {
        return FULLY_MASKED;
    }
}
/**
 * @description Applies the exporter's policy to a span's attributes: fills environment and release when the span has none, removes input and output when `redactIO` is set, and masks input, output and metadata when a mask is configured.
 * @param attributes {SpanAttributes} - Attributes of the span being exported.
 * @param policy {LangfuseAttributePolicy} - Environment, release, redaction and mask settings.
 * @returns {SpanAttributes} A new attribute record; the input is not modified.
 */
export function protectAttributes(attributes, policy) {
    const result = {
        ...(policy.environment && { "langfuse.environment": policy.environment }),
        ...(policy.release && { "langfuse.release": policy.release }),
        ...attributes,
    };
    for (const key of Object.keys(result)) {
        if (CONTENT_KEYS.has(key)) {
            if (policy.redactIO) {
                delete result[key];
            }
            else if (policy.mask) {
                result[key] = maskValue(result[key], policy.mask);
            }
        }
        else if (policy.mask &&
            METADATA_PREFIXES.some((prefix) => key.startsWith(prefix))) {
            result[key] = maskValue(result[key], policy.mask);
        }
    }
    return result;
}