CodeTops - gmail api

01

Select Desktop App for Applicaion Type* and give the same name as the console.cloud.google project name then click CREATE

02

This is also stated in the Gmail Api Documentation -> Quickstarts→Python

03

Download the the credentials to the same directory as the project, then click DONE

01

Go to OAuth consent screen to add ADD USERS and add your email to the User

04

Enter the email you wish to use

01

Go to jieJenn 00-GetStartGmailApi-Python for review, and install a venv in the directory of the project, and install the libraries

python -m venv venv

./venv/bin/activate

02

If ./venv/bin/activate Does Not Work run

source ./venv/bin/activate

03

Go to https://developers.google.com/gmail/api/quickstart/python , and install the client libraries

pip install --upgrade google-api-python-client google-auth-httplib2 google-auth-oauthlib

04

To deactivate and exit the venv type,

deactivate

01

To get started quick copy and paste the code into your script from the Gmail Api -> Quickstarts -> python page
https://developers.google.com/gmail/api/quickstart/python

02

 Make sure you change the name of credentials.json to your client_secret file name, and Keep creds = to None

import os.path

from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError

# If modifying these scopes, delete the file token.json.
SCOPES = ["https://www.googleapis.com/auth/gmail.readonly"]


def main():
  """Shows basic usage of the Gmail API.
  Lists the user's Gmail labels.
  """
  creds = None
  # The file token.json stores the user's access and refresh tokens, and is
  # created automatically when the authorization flow completes for the first
  # time.
  if os.path.exists("token.json"):
    creds = Credentials.from_authorized_user_file("token.json", SCOPES)
  # If there are no (valid) credentials available, let the user log in.
  if not creds or not creds.valid:
    if creds and creds.expired and creds.refresh_token:
      creds.refresh(Request())
    else:
      flow = InstalledAppFlow.from_client_secrets_file(
          "credentials.json ", SCOPES
      )
      creds = flow.run_local_server(port=0)
    # Save the credentials for the next run
    with open("token.json", "w") as token:
      token.write(creds.to_json())

  try:
    # Call the Gmail API
    service = build("gmail", "v1", credentials=creds)
    results = service.users().labels().list(userId="me").execute()
    labels = results.get("labels", [])

    if not labels:
      print("No labels found.")
      return
    print("Labels:")
    for label in labels:
      print(label["name"])

  except HttpError as error:
    # TODO(developer) - Handle errors from gmail API.
    print(f"An error occurred: {error}")


if __name__ == "__main__":
  main()

03

Run the python script and the browser will open to this page showing gmail accounts, **Only test users assigned in part 4 - add Test user

04

Click Continue

05

Click Continue

06

When you see this page, you can now use the data in your script

07

A token.json will be downloaded into the same directory as the script

06

The token.js file will appear in the same directory as the script

02

Within try: we can loop through the messages

try:
    service = build('gmail','v1',credentials=creds)
    result = service.users().messages().list(userId='me').execute()
    messages = result.get('messages')
    for i in messages:
        print(i)
except HttpError as error:
    print('err',error)

05

We can query the 'headers' and search for the attribute 'name' to find email's 'senders' 'From' and 'subjects' 'Subject to get their 'value'

06

Create 3 empty list to add to for

• subject
• senders
• body

and add to the list for each loop

subjects = []
senders = []
body = []                       

07

Loop through 'headers' and Query with a conditional and search for name for 'Subject', append to subjects and From, append to senders

try:
    service = build('gmail','v1',credentials=creds)
    result = service.users().messages().list(userId='me').execute()
    messages = result.get('messages')
    for i in messages:
        txt = service.users().messages().get(userId='me',id=i['id']).execute()
        payload = txt['payload'] 
        headers = payload['headers']
        for i in headers:
            if i['name'] == 'Subject':
                subjects.append(i['value'])
            if i ['name'] == 'From':
                senders.append(i['value'])
    print(subjects[0])
    print(senders[0])

08

The body of the email is the email itself, It is located in parts which is located back in payload

try:
    service = build('gmail','v1',credentials=creds)
    result = service.users().messages().list(userId='me').execute()
    messages = result.get('messages')
    for i in messages:
        txt = service.users().messages().get(userId='me',id=i['id']).execute()
        payload = txt.get('payload')
        headers = payload.get('headers')
        for i in headers:
            if i['name'] == 'Subject':
                subjects.append(i['value'])
            if i['name'] == 'From':
                senders.append(i['value'])
        parts = payload.get('parts')
        print(parts)

The parts is very long because it contains the email, if you scroll up you can see the 'body with the data attribute which contains the email content.