feat: Allowed for bot to access Google Calendar API (Issue #2)

.gitignore

@@ -128,4 +128,8 @@ dmypy.json
 # Pyre type checker
 .pyre/
 bot.env
-bot.env
+bot.env
+
+#Google calendar stuff
+credentials.json
+token.json

cogs/calendar.py

@@ -0,0 +1,68 @@
+from __future__ import print_function
+
+import datetime
+import os.path
+
+from discord.ext import commands, tasks
+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
+
+
+class Calendar(commands.Cog):
+
+    def __init__(self, bot):
+        self.bot = bot
+
+    @commands.command(name="listCalendarEvents")
+    async def listCalendarEvents(self, ctx):
+        # If modifying these scopes, delete the file token.json.
+        SCOPES = ['https://www.googleapis.com/auth/calendar.readonly']
+
+        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:
+            service = build('calendar', 'v3', credentials=creds)
+
+            # Call the Calendar API
+            now = datetime.datetime.utcnow().isoformat() + 'Z'  # 'Z' indicates UTC time
+            print('Getting the upcoming 10 events')
+            events_result = service.events().list(calendarId='primary', timeMin=now,
+                                                maxResults=10, singleEvents=True,
+                                                orderBy='startTime').execute()
+            events = events_result.get('items', [])
+
+            if not events:
+                print('No upcoming events found.')
+                return
+
+            # Prints the start and name of the next 10 events
+            for event in events:
+                start = event['start'].get('dateTime', event['start'].get('date'))
+                print(start, event['summary'])
+
+        except HttpError as error:
+            print('An error occurred: %s' % error)
+
+async def setup(bot):
+    n = Calendar(bot)
+    await bot.add_cog(n)
+