Initial commit

Author: btmash

handler.py

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+import json
+import re
+import smtplib
+import dns.resolver
+
+def verify(event, context):
+    verification_address = event['queryStringParameters']['email']
+    from_address = '[email protected]'
+    regex = '^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,})$'
+    match = re.match(regex, verification_address)
+    if (match == "None"):
+        body = {
+            'message': 'Bad Syntax',
+            'status': 'FALSE'
+        }
+    else:
+        split_verfication_address = verification_address.split('@')
+        domain = str(split_verfication_address[1])
+        records = dns.resolver.query(domain, 'MX')
+        mx_record = records[0].exchange
+        mx_record = str(mx_record)
+        # SMTP lib setup (use debug level for full output)
+        server = smtplib.SMTP()
+        server.set_debuglevel(0)
+        # SMTP Conversation
+        server.connect(mx_record)
+        server.helo(server.local_hostname) ### server.local_hostname(Get local server hostname)
+        server.mail(from_address)
+        code, message = server.rcpt(str(verification_address))
+        server.quit()
+        if (code == 250):
+            body = {
+                'message': 'Valid email',
+                'status': 'TRUE'
+            }
+        else:
+            body = {
+                'message': 'Invalid email',
+                'status': 'FALSE'
+            }
+    return {
+        'statusCode': 200,
+        'body': json.dumps(body)
+    }

package.json

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+{
+  "name": "email-verify",
+  "description": "",
+  "version": "0.1.0",
+  "dependencies": {},
+  "devDependencies": {
+    "serverless-python-requirements": "^4.0.0"
+  }
+}

requirements.txt

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+dnspython

serverless.yml

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+# Welcome to Serverless!
+#
+# This file is the main config file for your service.
+# It's very minimal at this point and uses default values.
+# You can always add more config options for more control.
+# We've included some commented out config examples here.
+# Just uncomment any of them to get that config option.
+#
+# For full config options, check the docs:
+#    docs.serverless.com
+#
+# Happy Coding!
+
+service: email-verify
+
+# You can pin your service to only deploy with a specific Serverless version
+# Check out our docs for more details
+frameworkVersion: ">=1.16.0 <2.0.0"
+
+plugins:
+  - serverless-python-requirements
+provider:
+  name: aws
+  runtime: python3.6
+
+# you can overwrite defaults here
+#  stage: dev
+#  region: us-east-1
+
+# you can add statements to the Lambda function's IAM Role here
+#  iamRoleStatements:
+#    - Effect: "Allow"
+#      Action:
+#        - "s3:ListBucket"
+#      Resource: { "Fn::Join" : ["", ["arn:aws:s3:::", { "Ref" : "ServerlessDeploymentBucket" } ] ]  }
+#    - Effect: "Allow"
+#      Action:
+#        - "s3:PutObject"
+#      Resource:
+#        Fn::Join:
+#          - ""
+#          - - "arn:aws:s3:::"
+#            - "Ref" : "ServerlessDeploymentBucket"
+#            - "/*"
+
+# you can define service wide environment variables here
+#  environment:
+#    variable1: value1
+
+# you can add packaging information here
+#package:
+#  include:
+#    - include-me.py
+#    - include-me-dir/**
+#  exclude:
+#    - exclude-me.py
+#    - exclude-me-dir/**
+
+functions:
+  email-verify:
+    handler: handler.verify
+    events:
+      - http:
+          path: email-verify
+          method: get
+#    The following are a few example events you can configure
+#    NOTE: Please make sure to change your handler code to work with those events
+#    Check the event documentation for details
+#    events:
+#      - http:
+#          path: users/create
+#          method: get
+#      - s3: ${env:BUCKET}
+#      - schedule: rate(10 minutes)
+#      - sns: greeter-topic
+#      - stream: arn:aws:dynamodb:region:XXXXXX:table/foo/stream/1970-01-01T00:00:00.000
+#      - alexaSkill
+#      - alexaSmartHome: amzn1.ask.skill.xx-xx-xx-xx
+#      - iot:
+#          sql: "SELECT * FROM 'some_topic'"
+#      - cloudwatchEvent:
+#          event:
+#            source:
+#              - "aws.ec2"
+#            detail-type:
+#              - "EC2 Instance State-change Notification"
+#            detail:
+#              state:
+#                - pending
+#      - cloudwatchLog: '/aws/lambda/hello'
+#      - cognitoUserPool:
+#          pool: MyUserPool
+#          trigger: PreSignUp
+
+#    Define function environment variables here
+#    environment:
+#      variable2: value2
+
+# you can add CloudFormation resource templates here
+#resources:
+#  Resources:
+#    NewResource:
+#      Type: AWS::S3::Bucket
+#      Properties:
+#        BucketName: my-new-bucket
+#  Outputs:
+#     NewOutput:
+#       Description: "Description for the output"
+#       Value: "Some output value"

test.json

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+{
+  "queryStringParameters": {
+      "email": "[email protected]"
+  }
+}