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| 'use strict';
var _ = require('underscore'),
Class = require('class.extend'),
DEFAULT_OPTS;
DEFAULT_OPTS = {
logRequest: true,
};
module.exports = Class.extend({
init: function(evt, context, opts) {
this._started = new Date().getTime();
this._event = evt;
this._context = context;
this._query = this._event.queryStringParameters || {};
this._pathParams = this._event.pathParameters || {};
this._headers = this._event.headers || {};
this._opts = _.extend({}, DEFAULT_OPTS, opts);
if (this._opts.logRequest) {
this.logRequest(_.extend({
event: 'api-request',
path: evt.path,
queryParams: this._query,
}, this._opts.additionalRequestLoggingData));
}
},
logRequest: function(reqObj) {
// eslint-disable-next-line no-console
console.log(JSON.stringify(reqObj));
},
_parseBody: function(throwError) {
// By default we just squash any errors while parsing the body, but if the user
// wants an error to be thrown, they can pass a flag to indicate this.
if (this._getContentTypeEssence() === 'application/json') {
try {
return JSON.parse(this._event.body);
} catch(err) {
if (throwError) {
throw err;
}
return null;
}
}
return null;
},
/**
* Returns the type and subtype, e.g. 'application/json', of the MIME type found in the
* Content-Type header.
*
* @see https://mimesniff.spec.whatwg.org/#mime-type-essence
* @return {string} The essence of the MIME or `undefined` if the Content-Type header
* is not found
*/
_getContentTypeEssence: function() {
var contentType = this.header('Content-Type');
return _.isString(contentType) ? contentType.replace(/;.*/, '').trim().toLowerCase() : undefined;
},
getEvent: function() {
return this._event;
},
getContext: function() {
return this._context;
},
validateQueryParams: function(rules) {
var invalidFields = [];
_.each(rules, function(rule, name) {
var isValid = true,
has = this.hasQueryParam(name),
val = this.query(name),
asNumber = Number(val);
if (has && !_.isUndefined(rule.pattern) && !rule.pattern.test(val)) {
this._query[name] = undefined;
isValid = false;
}
if (has && !_.isUndefined(rule.min) && (_.isNaN(asNumber) || asNumber < rule.min)) {
this._query[name] = undefined;
isValid = false;
}
if (has && !_.isUndefined(rule.max) && (_.isNaN(asNumber) || asNumber > rule.max)) {
this._query[name] = undefined;
isValid = false;
}
if (rule.required && (!this.hasQueryParam(name) || _.isEmpty(this.query(name)))) {
isValid = false;
}
if (isValid === false) {
invalidFields.push(name);
}
}.bind(this));
if (!_.isEmpty(invalidFields)) {
return { isValid: false, msg: 'Invalid fields: ' + invalidFields.join(', ') };
}
return { isValid: true };
},
hasPathParam: function(k) {
return !_.isUndefined(this.pathParam(k));
},
renamePathParam: function(from, to) {
// This is helpful in a scenario where you have two different types of operations
// that use a path param at the same location in the URL, so APIGW only allows you
// to use a single name for the param, but in the code it would make more sense if
// the param were named something different.
this._pathParams[to] = this._pathParams[from];
delete this._pathParams[from];
},
pathParam: function(k) {
return this._pathParams[k];
},
hasQueryParam: function(k) {
return !_.isUndefined(this.query(k));
},
query: function(k) {
return this._query[k];
},
context: function(k) {
return this._context[k];
},
body: function() {
return this._event.body;
},
parsedBody: function(throwError) {
if (_.isUndefined(this._parsedBody)) {
this._parsedBody = this._parseBody(throwError);
}
return this._parsedBody;
},
isBase64Encoded: function() {
return !!this._event.isBase64Encoded;
},
header: function(k) {
var userKey = (k || '').toLowerCase();
return _.find(this._headers, function(val, key) {
return key.toLowerCase() === userKey;
});
},
path: function() {
return this._event.path;
},
method: function() {
return this._event.httpMethod;
},
started: function() {
return this._started;
},
});
|