A generic binary http receiver for reusable purposes
Signed-off-by: Fabio José <fabiojose@gmail.com>
This commit is contained in:
Fabio José
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49119d707f
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ef6db28464
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@ -0,0 +1,122 @@
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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 {
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isDefinedOrThrow,
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isStringOrObjectOrThrow
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} = require("../../utils/fun.js");
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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 a 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 BinaryHTTPReceiver(
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parserByType,
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setterByHeader,
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allowedContentTypes,
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requiredHeaders,
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Spec) {
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this.parserByType = parserByType;
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this.setterByHeader = setterByHeader;
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this.allowedContentTypes = allowedContentTypes;
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this.requiredHeaders = requiredHeaders;
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this.Spec = Spec;
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this.spec = new Spec();
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}
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BinaryHTTPReceiver.prototype.check = function(payload, headers) {
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// Validation Level 0
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validateArgs(payload, headers);
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// Clone and low case all headers names
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var sanityHeaders = Commons.sanityAndClone(headers);
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// Validation Level 1
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if(!this.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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this.requiredHeaders
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.filter((required) => !sanityHeaders[required])
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.forEach((required) => {
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throw {message: "header '" + required + "' not found"};
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});
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if(sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION] !== "0.2"){
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throw {
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message: "invalid spec version",
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errors: [sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION]]
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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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BinaryHTTPReceiver.prototype.parse = function(payload, headers) {
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this.check(payload, headers);
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// Clone and low case all headers names
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var sanityHeaders = Commons.sanityAndClone(headers);
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var processedHeaders = [];
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var cloudevent = new Cloudevent(this.Spec);
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// dont worry, check() have seen what was required or not
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Array.from(Object.keys(this.setterByHeader))
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.filter((header) => sanityHeaders[header])
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.forEach((header) => {
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var setterName = this.setterByHeader[header].name;
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var parserFun = this.setterByHeader[header].parser;
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// invoke the setter function
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cloudevent[setterName](parserFun(sanityHeaders[header]));
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// to use ahead, for extensions processing
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processedHeaders.push(header);
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});
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// Parses the payload
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var parsedPayload =
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this.parserByType[sanityHeaders[Constants.HEADER_CONTENT_TYPE]]
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.parse(payload);
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// Every unprocessed header can be an extension
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Array.from(Object.keys(sanityHeaders))
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.filter((value) => !processedHeaders.includes(value))
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.filter((value) =>
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value.startsWith(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX))
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.map((extension) =>
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extension.substring(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX.length)
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).forEach((extension) =>
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cloudevent.addExtension(extension,
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sanityHeaders[Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX+extension])
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);
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// Sets the data
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cloudevent.data(parsedPayload);
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// Checks the event spec
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cloudevent.format();
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// return the result
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return cloudevent;
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};
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module.exports = BinaryHTTPReceiver;
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@ -1,10 +1,10 @@
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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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const JSONParser = require("../../formats/json/parser.js");
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const BinaryHTTPReceiver = require("./receiver_binary.js");
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const {
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isDefinedOrThrow,
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isStringOrObjectOrThrow
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@ -56,105 +56,22 @@ setterByHeader[Constants.HEADER_CONTENT_TYPE] = {
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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 a 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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this.receiver = new BinaryHTTPReceiver(
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parserByType,
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setterByHeader,
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allowedContentTypes,
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requiredHeaders,
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Spec02
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);
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}
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Receiver.prototype.check = function(payload, headers) {
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// Validation Level 0
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validateArgs(payload, headers);
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// Clone and low case all headers names
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var sanityHeaders = Commons.sanityAndClone(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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requiredHeaders
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.filter((required) => !sanityHeaders[required])
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.forEach((required) => {
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throw {message: "header '" + required + "' not found"};
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});
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if(sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION] !== "0.2"){
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throw {
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message: "invalid spec version",
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errors: [sanityHeaders[Constants.BINARY_HEADERS_02.SPEC_VERSION]]
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};
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}
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// No erros! Its contains the minimum required attributes
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this.receiver.check(payload, headers);
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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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// Clone and low case all headers names
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var sanityHeaders = Commons.sanityAndClone(headers);
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var processedHeaders = [];
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var cloudevent = new Cloudevent(Spec02);
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// dont worry, check() have seen what was required or not
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Array.from(Object.keys(setterByHeader))
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.filter((header) => sanityHeaders[header])
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.forEach((header) => {
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var setterName = setterByHeader[header].name;
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var parserFun = setterByHeader[header].parser;
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// invoke the setter function
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cloudevent[setterName](parserFun(sanityHeaders[header]));
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// to use ahead, for extensions processing
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processedHeaders.push(header);
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});
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// Parses the payload
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var parsedPayload =
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parserByType[sanityHeaders[Constants.HEADER_CONTENT_TYPE]]
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.parse(payload);
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// Every unprocessed header can be an extension
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Array.from(Object.keys(sanityHeaders))
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.filter((value) => !processedHeaders.includes(value))
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.filter((value) =>
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value.startsWith(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX))
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.map((extension) =>
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extension.substring(Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX.length)
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).forEach((extension) =>
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cloudevent.addExtension(extension,
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sanityHeaders[Constants.BINARY_HEADERS_02.EXTENSIONS_PREFIX+extension])
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);
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// Sets the data
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cloudevent.data(parsedPayload);
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// Checks the event spec
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cloudevent.format();
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// return the result
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return cloudevent;
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return this.receiver.parse(payload, headers);
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};
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module.exports = Receiver;
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