66 lines
1.8 KiB
JavaScript
66 lines
1.8 KiB
JavaScript
function envelopeResponses(_req, res, next) {
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const originalJson = res.json.bind(res);
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res.json = (payload) => {
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if (isApiEnvelope(payload)) {
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return originalJson(payload);
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}
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const isError = res.statusCode >= 400;
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const message = extractMessage(payload, isError);
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const errors = extractErrors(payload, isError, message);
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const data = isError ? null : payload;
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return originalJson({
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status: isError ? "error" : "success",
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data,
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message,
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errors,
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});
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};
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next();
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}
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function isApiEnvelope(payload) {
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return Boolean(
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payload &&
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typeof payload === "object" &&
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!Array.isArray(payload) &&
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Object.prototype.hasOwnProperty.call(payload, "status") &&
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Object.prototype.hasOwnProperty.call(payload, "data") &&
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Object.prototype.hasOwnProperty.call(payload, "message") &&
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Object.prototype.hasOwnProperty.call(payload, "errors")
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);
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}
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function extractMessage(payload, isError) {
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if (payload && typeof payload === "object" && !Array.isArray(payload)) {
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if (typeof payload.message === "string" && payload.message.length) {
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return payload.message;
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}
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if (typeof payload.error === "string" && payload.error.length) {
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return payload.error;
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}
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}
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return isError ? "Request failed" : "OK";
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}
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function extractErrors(payload, isError, message) {
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if (!isError) return [];
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if (payload && typeof payload === "object" && !Array.isArray(payload)) {
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if (Array.isArray(payload.errors)) {
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return payload.errors;
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}
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if (payload.error) {
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return [payload.error];
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}
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}
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return message ? [message] : [];
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}
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module.exports = {
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envelopeResponses,
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};
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