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getparts.py
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'''
Python3
API tool for electronic component suppliers (digikey, mouser, LCSC)
https://github.com/maholli/getparts
M.Holliday
'''
import requests
import json, re
import os.path
from os import path
from types import SimpleNamespace
from requests_html import HTMLSession
from bs4 import BeautifulSoup
oauth_headers = {
'Content-Type': 'application/x-www-form-urlencoded'
}
oauth_body = {
'client_id': "",
'client_secret': "",
'grant_type': 'refresh_token',
'refresh_token': ''
}
digi_headers = {
"X-DIGIKEY-Client-Id": "",
'authorization': "",
'accept': "application/json"
}
mouser_headers = {
'Content-Type': "application/json",
'accept': "application/json"
}
def printlevel(level,text):
print('\t'*level+str(text))
class API:
RECORDS_FILE = 'api_records_digi.txt'
def __init__(self,cred,debug=False):
self.DEBUG=debug
self.digi2D="https://api.digikey.com/Barcoding/v3/Product2DBarcodes/".encode('utf-8')
self.digi1D="https://api.digikey.com/Barcoding/v3/ProductBarcodes/".encode('utf-8')
self.digiPN="https://api.digikey.com/Search/v3/Products/".encode('utf-8')
self.mouserPN="https://api.mouser.com/api/v1/search/partnumber?apiKey=".encode('utf-8')
self.barcode=SimpleNamespace()
self.query=SimpleNamespace()
self.query.suppliers={
'digikey':{
'1D':lambda:requests.get(url=self.digi1D+self.barcode.barcode, headers=digi_headers),
'2D':lambda:requests.get(url=self.digi2D+self.barcode.barcode, headers=digi_headers),
'pn':lambda:requests.get(url=self.digiPN+self.barcode.response['DigiKeyPartNumber'].encode(),headers=digi_headers),
},
'mouser':{
'1D':lambda:print('mouser1d'),
'2D':lambda:requests.post(url=self.mouserPN+cred['mouser_key'].encode('utf-8'),data=self.barcode.mfpn.encode(), headers=mouser_headers),
},
'lcsc':{
'1D':lambda:print('lcsc1d'),
'2D':lambda:lcsc.scrape(self.barcode.supplierPN),
}
}
digi_headers['X-DIGIKEY-Client-Id']=cred['client_id']
oauth_body['client_id']=cred['client_id']
oauth_body['client_secret']=cred['client_secret']
self.setup_body = {k: cred[k] for k in ('code','client_id','client_secret')}
printlevel(0,'Looking for local API records file in local directory...')
if not path.exists('api_records_digi.txt'):
printlevel(2,'No records found!')
printlevel(2,'Running API setup...')
if self.api_setup():
printlevel(2,'API setup successful')
else:
printlevel(2,'API setup unsuccessful!')
printlevel(2,'Must repeat OAuth approval step and try again with new authorization code')
printlevel(3,'USE: https://api.digikey.com/v1/oauth2/authorize?response_type=code&client_id='+cred['client_id']+'&redirect_uri='+'https://localhost\n\n')
raise Exception('New OAuth code required')
else:
printlevel(1,'Records file found...')
try:
with open(self.RECORDS_FILE,'r') as apidata:
for line in apidata:
if line.startswith('#'):
continue
else:
latest = json.loads(line)
latest_refresh_token=latest['refresh_token']
latest_access_token=latest['access_token']
oauth_body['refresh_token']=latest['refresh_token']
digi_headers['authorization']= "Bearer "+latest['access_token']
except Exception as e:
printlevel(1,'Error loading/saving credentials to file: ',e)
def api_setup(self):
AUTH_URL="https://api.digikey.com/v1/oauth2/token".encode('utf-8')
self.setup_body['grant_type']="authorization_code"
self.setup_body['redirect_uri']="https://localhost"
try:
printlevel(2,'Sending authorization request...')
x = requests.post(url=AUTH_URL, data=self.setup_body, headers=oauth_headers)
response=x.json()
if self.DEBUG: print(json.dumps(response,indent=3,sort_keys=True))
except Exception as e:
print('\tERROR during API setup - POST:',e)
return False
if 'ErrorMessage' not in response:
printlevel(2,'Authorzation request successful')
printlevel(2,'Creating new records file: api_records_digi.txt')
try:
printlevel(2,'Saving authorization credentials to file...')
with open(self.RECORDS_FILE,'a') as apidata:
apidata.write(json.dumps(response,sort_keys=True))
apidata.write('\n')
return True
except Exception as e:
printlevel(2,'ERROR during API setup - SAVING step:',e)
return False
else:
if 'Invalid authCode' in response['ErrorMessage']:
printlevel(2,'ERROR during API setup - authorization code has expired')
else:
printlevel(2,'ERROR during API setup - Error message in POST')
return False
def refresh_token(self):
print('Bearer token expired, attempting to refresh...')
x = requests.post(url='https://api.digikey.com/v1/oauth2/token', data=oauth_body, headers=oauth_headers)
data=x.json()
print('New token:', data)
with open(self.RECORDS_FILE,'a') as apidata:
try:
print('Before Refresh:')
print('\t',oauth_body['refresh_token'])
print('\t',digi_headers['authorization'])
apidata.write(json.dumps(data,sort_keys=True))
apidata.write('\n')
oauth_body['refresh_token']=data['refresh_token']
digi_headers['authorization']= "Bearer "+data['access_token']
print('After Refresh:')
print('\t',oauth_body['refresh_token'])
print('\t',digi_headers['authorization'])
print('Updated Records File: {}\n'.format(self.RECORDS_FILE))
return True
except Exception as e:
print('Refresh Error:',e)
return False
def search(self,scan,product_info=False):
# Determine barcode type and supplier
self.barcode.barcode=scan.data
if self.DEBUG: print(scan)
try:
if 'QRCODE' in scan.type:
self.barcode.type='2D'
self.barcode.supplier='lcsc'
supPN=re.split(r",",self.barcode.barcode.decode())
self.barcode.supplierPN=supPN[1][12:]
elif 'CODE128' in scan.type:
self.barcode.type='1D'
if self.barcode.barcode.decode().isdecimal():
if len(self.barcode.barcode) > 10:
self.barcode.supplier='digikey'
else:
print("Short barcode... possibly Mouser Line Item or QTY: ".format(self.barcode.barcode.decode()))
else:
self.barcode.supplier='mouser'
else:
print('Unknown supplier')
except AttributeError:
self.barcode.type='2D'
if b'>[)>' in self.barcode.barcode:
self.barcode.supplier='mouser'
mfgpart=re.split(r" ",self.barcode.barcode.decode())
print('mfgpart:',mfgpart)
if '1P' in mfgpart[3]:
self.barcode.mfpn="{\"SearchByPartRequest\": {\"mouserPartNumber\": \""+mfgpart[3][2:]+"\",}}"
else:
self.barcode.supplier='digikey'
# make supplier-specific API query
try:
r=self.query.suppliers[self.barcode.supplier][self.barcode.type]()
self.barcode.response=r.json()
if 'ErrorMessage' in self.barcode.response:
if 'Bearer token expired' in self.barcode.response['ErrorMessage']:
if self.refresh_token():
r=self.query.suppliers[self.barcode.supplier][self.barcode.type]()
self.barcode.response=r.json()
else:
print('Fatal error during token refresh ')
return
if product_info:
self.barcode.type='pn'
try:
r=self.query.suppliers[self.barcode.supplier][self.barcode.type]()
self.barcode.response.update(r.json())
except Exception as e:
print('Error during Product Info request:',e)
print(json.dumps(self.barcode.response,indent=3,sort_keys=True))
return self.barcode
except Exception as e:
print('Error during API request:',e)
if self.DEBUG:print('Attributes: {}'.format(self.barcode))
return
class lcscdata:
def __init__(self,val):
self.value=val
def json(self):
return self.value
class lcsc:
def scrape(pn):
lcscPN=pn
# create an HTML Session object
session = HTMLSession()
# Use the object above to connect to needed webpage
r1 = session.get("https://lcsc.com/search?q="+lcscPN)
# Run any JavaScript code on webpage
r1.html.render()
# Find absolute link for product page
a=r1.html.find('body > div#lcsc.push-body > div#global_search.contianer > div.table-content > section > div > div#product_table_list > div.product-list-area.table-area > table')
links=a[0].absolute_links
for link in links:
if lcscPN+'.html' in link:
product_page=link
# Load product page
direct=session.get(product_page)
soup = BeautifulSoup(direct.html.html, "lxml")
# Find correct product table
table=soup.find('table', attrs={'class':'products-specifications'}) # 2nd table
table_body = table.find('tbody')
rows = table_body.find_all('tr')
result=lcscdata({})
for row in rows:
cols = row.find_all('td')
cols = [ele.text.strip() for ele in cols]
line=[ele for ele in cols if ele]
try:
result.value.update({line[0]:line[1]})
except:
pass
return result