60 lines
1.2 KiB
JavaScript
60 lines
1.2 KiB
JavaScript
const {
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isString,
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isDefinedOrThrow,
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isStringOrObjectOrThrow
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} = require("../../utils/fun.js");
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function JSONParser(decorator) {
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this.decorator = decorator;
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}
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const invalidPayloadTypeError =
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new Error("invalid payload type, allowed are: string or object");
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const nullOrIndefinedPayload =
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new Error("null or undefined payload");
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// Function
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const asJSON = (v) => (isString(v) ? JSON.parse(v) : v);
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/**
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* Level 0 of validation: is that string? is that JSON?
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*/
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function validateAndParse(payload) {
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var json =
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Array.of(payload)
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.filter((p) => isDefinedOrThrow(p, nullOrIndefinedPayload))
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.filter((p) => isStringOrObjectOrThrow(p, invalidPayloadTypeError))
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.map(asJSON)
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.shift();
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return json;
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}
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/*
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* Level 1 of validation: is that follow a spec?
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*/
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function validateSpec(payload, spec) {
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// is that follow the spec?
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spec.check(payload);
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return payload;
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}
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JSONParser.prototype.parse = function(payload) {
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let toparse = payload;
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if(this.decorator) {
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toparse = this.decorator.parse(payload);
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}
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//is that string? is that JSON?
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var valid = validateAndParse(toparse);
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return valid;
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};
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module.exports = JSONParser;
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