How do i format the headers field in step function api invoke - amazon-web-services

Question

I am trying to execute a AWS api via step function. I need to pass the authorizationToken value in the header field.
{
"ApiEndpoint": "ccqk9ijm0h.execute-api.ap-southeast-2.amazonaws.com",
"Method": "POST",
"Headers": {
"authorizationToken.$": [
"$.InputToken"
]
},
"Stage": "test",
"Path": "/",
"RequestBody": {
"productType": [],
"xxx.$": "$.xxx",
"yyy.$": "$.yyy",
"zzz.$": "$.zzz"
},
"AuthType": "IAM_ROLE"
}
I am getting the following error -
The value for the field 'authorizationToken.$' must be a STRING that contains a JSONPath but was an ARRAY (at /States/GetDeclarations/Parameters)
This is the default syntax for the API invoke -
"Headers": {
"Header1": [
"HeaderValue1"
],
"Header2": [
"HeaderValue2",
"HeaderValue3"
]
}
When i modify this to
"Headers": {
"authorizationToken": [
"1234"
],
"Header2": [
"HeaderValue2",
"HeaderValue3"
]
}
It works fine.
I need to make the value of "authorizationToken" a variable that takes its value from the input.
My Input data looks like this
{
"xxx": "123",
"yyy": "123",
"zzz": "123",
"InputToken": "123",
"aaa": "123"
}

Answer 1

You need to use the States.Array Intrinsic Function as I've shown below. This allows you to inject an array into a node in your Parameters block. In this case, you just want a single item in the array, but you can include multiple items as well (e.g., States.Array($.item1,$.item2,$.item3)).
Check out the other Intrinsic Functions as well, as they are handy for overcoming challenges like this.
{
"ApiEndpoint": "ccqk9ijm0h.execute-api.ap-southeast-2.amazonaws.com",
"Method": "POST",
"Headers": {
"authorizationToken.$": "States.Array($.InputToken)"
},
"Stage": "test",
"Path": "/",
"RequestBody": {
"productType": [],
"xxx.$": "$.xxx",
"yyy.$": "$.yyy",
"zzz.$": "$.zzz"
},
"AuthType": "IAM_ROLE"
}