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# MIT No Attribution
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
require 'json'
require 'rack'
require 'base64'
# Global object that responds to the call method. Stay outside of the handler
# to take advantage of container reuse
$app ||= Rack::Builder.parse_file("#{File.dirname(__FILE__)}/app/config.ru").first
def handler(event:, context:)
# Check if the body is base64 encoded. If it is, try to decode it
if event["isBase64Encoded"]
body = Base64.decode64(event['body'])
else
body = event['body']
end
# Rack expects the querystring in plain text, not a hash
querystring = Rack::Utils.build_query(event['queryStringParameters']) if event['queryStringParameters']
# Environment required by Rack (http://www.rubydoc.info/github/rack/rack/file/SPEC)
env = {
"REQUEST_METHOD" => event['httpMethod'],
"SCRIPT_NAME" => "",
"PATH_INFO" => event['path'] || "",
"QUERY_STRING" => querystring || "",
"SERVER_NAME" => "localhost",
"SERVER_PORT" => 443,
"CONTENT_TYPE" => event['headers']['content-type'],
"rack.version" => Rack::VERSION,
"rack.url_scheme" => "https",
"rack.input" => StringIO.new(body || ""),
"rack.errors" => $stderr,
}
# Pass request headers to Rack if they are available
unless event['headers'].nil?
event['headers'].each{ |key, value| env["HTTP_#{key}"] = value }
end
begin
# Response from Rack must have status, headers and body
status, headers, body = $app.call(env)
# body is an array. We simply combine all the items to a single string
body_content = ""
body.each do |item|
body_content += item.to_s
end
# We return the structure required by AWS API Gateway since we integrate with it
# https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html
response = {
"statusCode" => status,
"headers" => headers,
"body" => body_content
}
if event["requestContext"].has_key?("elb")
# Required if we use application load balancer instead of API GW
response["isBase64Encoded"] = false
end
rescue Exception => msg
# If there is any exception, we return a 500 error with an error message
response = {
"statusCode" => 500,
"body" => msg
}
end
# By default, the response serializer will call #to_json for us
response
end