Created
April 11, 2018 08:57
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## convert HTML POST data or HTTP GET query string to JSON | |
## get the raw post data from the AWS built-in variable and give it a nicer name | |
#if ($context.httpMethod == "POST") | |
#set($rawAPIData = $input.path("$")) | |
#elseif ($context.httpMethod == "GET") | |
#set($rawAPIData = $input.params().querystring) | |
#set($rawAPIData = $rawAPIData.toString()) | |
#set($rawAPIDataLength = $rawAPIData.length() - 1) | |
#set($rawAPIData = $rawAPIData.substring(1, $rawAPIDataLength)) | |
#set($rawAPIData = $rawAPIData.replace(", ", "&")) | |
#else | |
#set($rawAPIData = "") | |
#end | |
## first we get the number of "&" in the string, this tells us if there is more than one key value pair | |
#set($countAmpersands = $rawAPIData.length() - $rawAPIData.replace("&", "").length()) | |
## if there are no "&" at all then we have only one key value pair. | |
## we append an ampersand to the string so that we can tokenise it the same way as multiple kv pairs. | |
## the "empty" kv pair to the right of the ampersand will be ignored anyway. | |
#if ($countAmpersands == 0) | |
#set($rawPostData = $rawAPIData + "&") | |
#end | |
## now we tokenise using the ampersand(s) | |
#set($tokenisedAmpersand = $rawAPIData.split("&")) | |
## we set up a variable to hold the valid key value pairs | |
#set($tokenisedEquals = []) | |
## now we set up a loop to find the valid key value pairs, which must contain only one "=" | |
#foreach( $kvPair in $tokenisedAmpersand ) | |
#set($countEquals = $kvPair.length() - $kvPair.replace("=", "").length()) | |
#if ($countEquals == 1) | |
#set($kvTokenised = $kvPair.split("=")) | |
#if ($kvTokenised[0].length() > 0) | |
## we found a valid key value pair. add it to the list. | |
#set($devNull = $tokenisedEquals.add($kvPair)) | |
#end | |
#end | |
#end | |
## next we set up our loop inside the output structure "{" and "}" | |
{ | |
#foreach( $kvPair in $tokenisedEquals ) | |
## finally we output the JSON for this pair and append a comma if this isn't the last pair | |
#set($kvTokenised = $kvPair.split("=")) | |
##define vars for JSON keyname and keyvalue | |
#set($keyName = "$util.urlDecode($kvTokenised[0])") | |
#set($keyValue = "") | |
#set($idxPosition = $kvPair.indexOf("=")) | |
#set($strLen = $kvPair.length()) | |
#set($strLen = $strLen - 1) | |
##check value exists for the key | |
#if($idxPosition != $strLen) | |
#set($ValExists = true) | |
#else | |
#set($ValExists = false) | |
#end | |
#if($ValExists && $kvTokenised[1].length() > 0) | |
#set($keyValue = "$util.urlDecode($kvTokenised[1])") | |
#end | |
#if($keyName.toUpperCase() == "DATA") | |
#set($keyValue = "$util.base64Encode($kvTokenised[1])") | |
#end | |
"$keyName" : "$keyValue" #if( $foreach.hasNext ),#end | |
#end | |
##Append the StreamName | |
,"StreamName": "$input.params('stream-name')" | |
} |
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