Created
September 28, 2017 19:59
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API Gateway html form to json
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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 = $kvPair.split("=")) | |
"$util.urlDecode($kvTokenised[0])" : #if($kvTokenised[1].length() > 0)"$util.urlDecode($kvTokenised[1])"#{else}""#end#if( $foreach.hasNext ),#end | |
#end | |
} |
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