combine output of new APIs to create an IEconItems_440/GetSchema style schema

get_schema.py

#!/usr/bin/env python
# generate the old IEconItems_440/GetSchema style as a file using the new APIs
#  buddhapest 2018
#
# pip install request
# pip install simplejson
#
# fill in your API key
#
# ./get_schema.py
#
# outputs schema.json file that can be consumed just like the old schema output

import os
import time
import requests
import simplejson as json

params = {
    'key': '### your API key here ###',
    'language': 'en',
}

# output filename
fname = 'schema.json'

headers = None

# if we already have a schema.json...
if os.path.isfile(fname):
    # ... get its file system time and set a header for the request
    headers = {'If-Modified-Since': time.ctime(os.path.getmtime(fname))}

r = requests.get('https://api.steampowered.com/IEconItems_440/GetSchemaOverview/v1/',
                 params=params, headers=headers)

# if 304 (Not Modified) was returned, short circuit - our schema.json is up to date
if r.status_code == requests.codes.not_modified:
    exit()

# blow up if not 200 (OK)
if r.status_code != requests.codes.ok:
    r.raise_for_status()

schema = r.json()

schema['result']['items'] = []

params['start'] = 0

# loop on GetSchemaItems until there's no "next" key
while True:
    r = requests.get('https://api.steampowered.com/IEconItems_440/GetSchemaItems/v1/', params=params)

    if r.status_code != requests.codes.ok:
        r.raise_for_status()

    result = r.json()['result']

    schema['result']['items'].extend(result['items'])

    if 'next' in result:
        params['start'] = result['next']
    else:
        break

# write out our new schema
with open(fname, 'w') as fd:
    json.dump(schema, fd)