93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
/**
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* Универсальные хелперы для JSON/текста из локального storage (SQLite)
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*/
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const { headMeta, readS3TextObject } = require('../services/s3Service');
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const { sendError, checkIfNoneMatch } = require('../middleware/errorHandler');
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/**
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* Универсальный GET для JSON объектов с заголовками
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*/
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async function getS3JsonWithHeaders(s3Key, req, res, options = {}) {
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const { transform = (data) => data, defaultValue = [] } = options;
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try {
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const head = await headMeta(s3Key);
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const etag = head?.etag || null;
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if (etag) res.set('ETag', String(etag));
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if (head?.lastModified) res.set('Last-Modified', new Date(head.lastModified).toUTCString());
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if (typeof head?.contentLength === 'number') res.set('Content-Length-Source', String(head.contentLength));
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if (checkIfNoneMatch(req, res, etag)) return;
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let fileContent;
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try {
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const data = await readS3TextObject(s3Key);
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fileContent = data.body;
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} catch (e) {
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if (e?.code === 'NoSuchKey') {
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return res.json(transform(defaultValue));
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}
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throw e;
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}
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let parsed;
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try {
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parsed = JSON.parse(fileContent);
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if (!Array.isArray(parsed) && Array.isArray(defaultValue)) {
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parsed = defaultValue;
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}
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} catch (parseError) {
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console.error(`Error parsing ${s3Key}:`, parseError);
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parsed = defaultValue;
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}
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const result = transform(parsed);
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res.json(result);
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} catch (error) {
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console.error(error);
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return sendError(res, 500, 'Error reading storage', 'E_STORAGE');
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}
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}
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/**
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* Универсальный GET для текстовых объектов с заголовками
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*/
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async function getS3TextWithHeaders(s3Key, req, res, options = {}) {
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const { transform = (text) => ({ config: text }), defaultValue = '' } = options;
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try {
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const head = await headMeta(s3Key);
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const etag = head?.etag || null;
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if (etag) res.set('ETag', String(etag));
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if (head?.lastModified) res.set('Last-Modified', new Date(head.lastModified).toUTCString());
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if (typeof head?.contentLength === 'number') res.set('Content-Length-Source', String(head.contentLength));
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if (checkIfNoneMatch(req, res, etag)) return;
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let text;
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try {
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const data = await readS3TextObject(s3Key);
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text = data.body;
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} catch (e) {
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if (e?.code === 'NoSuchKey') {
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return res.json(transform(defaultValue));
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}
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throw e;
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}
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const result = transform(text);
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res.json(result);
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} catch (error) {
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console.error(error);
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return sendError(res, 500, 'Error reading storage', 'E_STORAGE');
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}
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}
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module.exports = {
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getS3JsonWithHeaders,
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getS3TextWithHeaders,
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};
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