@aws-lambda-powertools/parser/lib/esm/envelopes/sns.js

The parser package for the Powertools for AWS Lambda (TypeScript) library.

import { ZodError } from 'zod';
import { ParseError } from '../errors.js';
import { SnsSchema } from '../schemas/sns.js';
import { envelopeDiscriminator } from './envelope.js';
/**
 * SNS Envelope to extract array of Records
 *
 * The record's body parameter is a string, though it can also be a JSON encoded string.
 * Regardless of its type it'll be parsed into a BaseModel object.
 *
 * Note: Records will be parsed the same way so if model is str,
 * all items in the list will be parsed as str and npt as JSON (and vice versa)
 */
export const SnsEnvelope = {
    /**
     * This is a discriminator to differentiate whether an envelope returns an array or an object
     * @hidden
     */
    [envelopeDiscriminator]: 'array',
    parse(data, schema) {
        const parsedEnvelope = SnsSchema.parse(data);
        return parsedEnvelope.Records.map((record, index) => {
            try {
                return schema.parse(record.Sns.Message);
            }
            catch (error) {
                throw new ParseError(`Failed to parse SNS record at index ${index}`, {
                    cause: new ZodError(error.issues.map((issue) => ({
                        ...issue,
                        path: ['Records', index, 'Sns', 'Message', ...issue.path],
                    }))),
                });
            }
        });
    },
    safeParse(data, schema) {
        const parsedEnvelope = SnsSchema.safeParse(data);
        if (!parsedEnvelope.success) {
            return {
                success: false,
                error: new ParseError('Failed to parse SNS envelope', {
                    cause: parsedEnvelope.error,
                }),
                originalEvent: data,
            };
        }
        const result = parsedEnvelope.data.Records.reduce((acc, message, index) => {
            const parsedMessage = schema.safeParse(message.Sns.Message);
            if (!parsedMessage.success) {
                acc.success = false;
                const issues = parsedMessage.error.issues.map((issue) => ({
                    ...issue,
                    path: ['Records', index, 'Sns', 'Message', ...issue.path],
                }));
                acc.errors[index] = { issues };
                return acc;
            }
            acc.messages.push(parsedMessage.data);
            return acc;
        }, { success: true, messages: [], errors: {} });
        if (result.success) {
            return { success: true, data: result.messages };
        }
        const errorMessage = Object.keys(result.errors).length > 1
            ? `Failed to parse SNS messages at indexes ${Object.keys(result.errors).join(', ')}`
            : `Failed to parse SNS message at index ${Object.keys(result.errors)[0]}`;
        const errorCause = new ZodError(Object.values(result.errors).flatMap((error) => error.issues));
        return {
            success: false,
            error: new ParseError(errorMessage, { cause: errorCause }),
            originalEvent: data,
        };
    },
};