130 lines
3.5 KiB
JavaScript
130 lines
3.5 KiB
JavaScript
const Constants = require("./constants.js");
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const Commons = require("./commons.js");
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const Cloudevent = require("../../cloudevent.js");
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const Spec02 = require("../../specs/spec_0_2.js");
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var JSONParser = require("../../formats/json/parser.js");
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const {
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isDefinedOrThrow,
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isStringOrObjectOrThrow
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} = require("../../utils/fun.js");
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const spec02 = new Spec02();
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const jsonParserSpec02 = new JSONParser();
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const parserByMime = {};
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parserByMime[Constants.MIME_JSON] = jsonParserSpec02;
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parserByMime[Constants.MIME_CE_JSON] = jsonParserSpec02;
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const allowedContentTypes = [];
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allowedContentTypes.push(Constants.MIME_CE_JSON);
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const setterByAttribute = {};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.TYPE] = {
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name : "type",
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parser : (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.SPEC_VERSION] = {
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name : "specversion",
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parser : (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.SOURCE] = {
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name : "source",
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parser: (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.ID] = {
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name : "id",
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parser : (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.TIME] = {
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name : "time",
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parser : (v) => new Date(Date.parse(v))
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.SCHEMA_URL] = {
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name: "schemaurl",
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parser: (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.CONTENT_TYPE] = {
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name: "contenttype",
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parser: (v) => v
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};
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setterByAttribute[Constants.STRUCTURED_ATTRS_02.DATA] = {
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name: "data",
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parser: (v) => v
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};
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function validateArgs(payload, attributes) {
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Array.of(payload)
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.filter((p) => isDefinedOrThrow(p,
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{message: "payload is null or undefined"}))
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.filter((p) => isStringOrObjectOrThrow(p,
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{message: "payload must be an object or string"}))
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.shift();
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Array.of(attributes)
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.filter((a) => isDefinedOrThrow(a,
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{message: "attributes is null or undefined"}))
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.shift();
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}
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function Receiver(configuration) {
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}
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Receiver.prototype.check = function(payload, headers) {
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validateArgs(payload, headers);
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var sanityHeaders = Commons.sanity_and_clone(headers);
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// Validation Level 1
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if(!allowedContentTypes
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.includes(sanityHeaders[Constants.HEADER_CONTENT_TYPE])){
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throw {
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message: "invalid content type",
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errors: [sanityHeaders[Constants.HEADER_CONTENT_TYPE]]
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};
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}
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// No erros! Its contains the minimum required attributes
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}
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Receiver.prototype.parse = function(payload, headers) {
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this.check(payload, headers);
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var sanityHeaders = Commons.sanity_and_clone(headers);
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var contentType = sanityHeaders[Constants.HEADER_CONTENT_TYPE];
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var parser = parserByMime[contentType];
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var event = parser.parse(payload);
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spec02.check(event);
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var processedAttributes = [];
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var cloudevent = new Cloudevent(Spec02);
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Array.from(Object.keys(setterByAttribute))
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.forEach((attribute) => {
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var setterName = setterByAttribute[attribute].name;
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var parserFun = setterByAttribute[attribute].parser;
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// invoke the setter function
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cloudevent[setterName](parserFun(event[attribute]));
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// to use ahead, for extensions processing
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processedAttributes.push(attribute);
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});
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// Every unprocessed attribute should be an extension
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Array.from(Object.keys(event))
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.filter((attribute) => !processedAttributes.includes(attribute))
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.forEach((extension) =>
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cloudevent.addExtension(extension, event[extension])
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);
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return cloudevent;
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}
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module.exports = Receiver;
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