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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("#{__dir__}/app/config.ru").first
ENV['RACK_ENV'] ||= 'production'
def handler(event:, context:)
# Check if the body is base64 encoded. If it is, try to decode it
body = if event['isBase64Encoded']
Base64.decode64 event['body']
else
event['body']
end || ''
# Rack expects the querystring in plain text, not a hash
headers = event.fetch 'headers', {}
# Environment required by Rack (http://www.rubydoc.info/github/rack/rack/file/SPEC)
env = {
'REQUEST_METHOD' => event.fetch('httpMethod'),
'SCRIPT_NAME' => '',
'PATH_INFO' => event.fetch('path', ''),
'QUERY_STRING' => Rack::Utils.build_query(event['queryStringParameters'] || {}),
'SERVER_NAME' => headers.fetch('Host', 'localhost'),
'SERVER_PORT' => headers.fetch('X-Forwarded-Port', 443).to_s,
'rack.version' => Rack::VERSION,
'rack.url_scheme' => headers.fetch('CloudFront-Forwarded-Proto') { headers.fetch('X-Forwarded-Proto', 'https') },
'rack.input' => StringIO.new(body),
'rack.errors' => $stderr,
}
# Pass request headers to Rack if they are available
headers.each_pair do |key, value|
# 'CloudFront-Forwarded-Proto' => 'CLOUDFRONT_FORWARDED_PROTO'
# Content-Type and Content-Length are handled specially per the Rack SPEC linked above.
name = key.upcase.gsub '-', '_'
header = case name
when 'CONTENT_TYPE', 'CONTENT_LENGTH'
name
else
"HTTP_#{name}"
end
env[header] = value.to_s
end
begin
# Response from Rack must have status, headers and body
status, headers, body = $app.call env
# body is an array. We 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 Gateway
response['isBase64Encoded'] = false
end
rescue Exception => exception
# If there is _any_ exception, we return a 500 error with an error message
response = {
'statusCode' => 500,
'body' => exception.message
}
end
# By default, the response serializer will call #to_json for us
response
end