hbhistory.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import datetime
import requests

URL = 'http://b.hatena.ne.jp/{user}/atomfeed?date={date}'

def years_ago(years):
    if isinstance(years, str) or isinstance(years, unicode):
        years = int(years)
    today = datetime.date.today()
    d = today + datetime.timedelta(days = -1 * 365 * years)
    return "%04d%02d%02d" % (d.year, d.month, d.day)

def query_parameter(params, key, default=None):
    try:
        return params['queryStringParameters'][key]
    except KeyError as e:
        return default

def bookmarks(event, context):
    s = requests.Session()

    year = query_parameter(event, 'year', 1)
    user = query_parameter(event, 'user', 'sample')
    url = URL.format(date = years_ago(year), user = user)
    r = s.get(url)
    response = {
        "statusCode": r.status_code,
        "body": r.text
    }
    return response

# call lambda_handler
if __name__ == "__main__":
    bookmarks({}, {})

serverless.yml

service: hbhistory

provider:
  name: aws
  runtime: python2.7
  stage:   ${opt:stage,   self:custom.defaultStage}
  region:  ${opt:region,  self:custom.defaultRegion}
  profile: ${opt:profile, self:custom.defaultProfile}

functions:
  hbhistory:
    handler: hbhistory.bookmarks
    events:
      - http: GET bookmarks

plugins:
  - serverless-python-requirements

custom:
  defaultStage: dev
  defaultProfile: default
  defaultRegion: ap-northeast-1