2-1.発信者番号の自動切替

{
	"Version": "2012-10-17",
	"Statement": [
		{
			"Sid": "VisualEditor0",
			"Effect": "Allow",
			"Action": [
				"dynamodb:BatchGet*",
				"dynamodb:DescribeReservedCapacity*",
				"dynamodb:DescribeTable",
				"dynamodb:Get*",
				"dynamodb:Scan",
				"dynamodb:List*",
				"dynamodb:Query",
				"dynamodb:DescribeStream",
				"dynamodb:DescribeTimeToLive",
				"dynamodb:DescribeLimits"
			],
			"Resource": "*"
		}
	]
}

import json
import json
import boto3

from boto3 import resource
from boto3.dynamodb.conditions import Key
dynamodb_resource   = resource('dynamodb')
areaCodesTable = dynamodb_resource.Table('USAreaCodes')
RET_ERROR = 999

def lambda_handler(event, context):
	phoneNumber = event['Details']['ContactData']['CustomerEndpoint']['Address'] 
#	areaCode = (phoneNumber[0:5])[-3:]
	areaCode = (phoneNumber)
	response = ''
	try:
		response = retrieveOutboundDialNumber(areaCode)
	except Exception as e:
		return {
			'statusCode': RET_ERROR,
			'OutboundDialNumber':str(e)
		}
		
	if response != '' :
		if 0 < response['Count'] :
			return {
				'statusCode': response['ResponseMetadata']['HTTPStatusCode'],
				'OutboundDialNumber': response['Items'][0]['OutboundDialNumber']
			}
		else :
			return {
				'statusCode': RET_ERROR,
				'OutboundDialNumber':response['Count']
			}
		
def retrieveOutboundDialNumber(areaCode):
	try:
		response = areaCodesTable.query(
			KeyConditionExpression=Key('AreaCode').eq(areaCode),
			ScanIndexForward=False,
			Limit=1
		)
	except Exception as ex:
		raise ex
	else :
		return response

{
	"Details": {
		"ContactData": {
			"CustomerEndpoint": {
				"Address": "+12345678912"
			}
		}
	}
}