Created
December 13, 2017 22:17
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A simple (and not perfect) AWS lambda function to work around the ignored `Access-Control-Allow-Origin: *` wildcard in Google Chrome.
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exports.handler = (event, context, callback) => { | |
// Checking properties case insensitively, might be a better solution but this one works | |
// => https://stackoverflow.com/a/5833423/519376 | |
Object.prototype.hasOwnPropertyCI = function(prop) { | |
return Object.keys(this) | |
.filter(function (v) { | |
return v.toLowerCase() === prop.toLowerCase(); | |
}).length > 0; | |
}; | |
Object.prototype.getPropertyCI = function(prop) { | |
return this[Object.keys(this) | |
.filter(function (v) { | |
return v.toLowerCase() === prop.toLowerCase(); | |
})[0]]; // Be carefull here! | |
}; | |
var headers = {}; | |
if(event.headers.hasOwnPropertyCI("access-control-request-headers")) | |
headers["Access-Control-Allow-Headers"] = event.headers.getPropertyCI('access-control-request-headers'); | |
if(event.headers.hasOwnPropertyCI("access-control-request-method")) | |
headers["Access-Control-Allow-Methods"] = event.headers.getPropertyCI('access-control-request-method'); | |
if(event.headers.hasOwnPropertyCI("origin")) | |
headers["Access-Control-Allow-Origin"] = event.headers.getPropertyCI('origin'); | |
//console.log(headers); | |
var response = { | |
statusCode: 204, | |
headers: headers | |
}; | |
callback(null, response); | |
}; |
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