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1--- Guide ---
2https://developers.google.com/identity/protocols/OAuth2ForDevices
3
4--- Steps ---
51 - Go to URL
6	https://console.developers.google.com
7
82 - Navigate
9	(Top Left) Select A Project -> New Project
10	Library -> Google Calendar API -> Enable
11
12	(Left) Credentials -> Configure Consent Screen
13	Internal
14	Application Name
15	Add Scopes -> calendar.readonly, calendar.events.readonly
16
17	(Left) Credentials -> Create Credentials -> OAuth Client ID
18	Other -> Name
19	Copy Client ID, Client Secret
20
213 - Follow Guide
22	https://developers.google.com/identity/protocols/OAuth2ForDevices#obtaining-oauth-2.0-access-tokens
23
24
25*** Guide Details ***
26
27------ Request API Key ------
28POST /device/code HTTP/1.1
29Host: oauth2.googleapis.com
30Content-Type: application/x-www-form-urlencoded
31
32client_id=[client_id]&scope=calendar.readonly%20calendar.events.readonly
33------ Response ------
34{
35  "device_code": "4/4-GMMhmHCXhWEzkobqIHGG_EnNYYsAkukHspeYUk9E8",
36  "user_code": "GQVQ-JKEC",
37  "verification_url": "https://www.google.com/device",
38  "expires_in": 1800,
39  "interval": 5
40}
41------ ------
421. Show verification_url
432. Show user_code
443. Grant access via browser
45
46------ Poll Every [interval] seconds ------
47POST /token HTTP/1.1
48Host: oauth2.googleapis.com
49Content-Type: application/x-www-form-urlencoded
50
51client_id=[client_id]&
52client_secret=[client_secret]&
53code=[device_code]&
54grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Adevice_code
55------ Response Access Granted ------
56{
57  "access_token": "1/fFAGRNJru1FTz70BzhT3Zg",
58  "expires_in": 3920,
59  "scope": "openid https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email",
60  "token_type": "Bearer",
61  "refresh_token": "1/xEoDL4iW3cxlI7yDbSRFYNG01kVKM2C-259HOF2aQbI"
62}
63------ ------
64Wait for Access Granted (200 OK ???)
65Errors (400, 401)
66
67API Reference:
68https://developers.google.com/calendar/v3/reference/?apix=true#Events
69
70------ Get Events ------
71GET /calendar/v3/calendars/[calendarId]/events[API] HTTP/1.1
72Host: www.googleapis.com
73Authorization: Bearer [access_token]
74------ Response ------
75{
76  "kind": "calendar#events",
77  "etag": etag,
78  "summary": string,
79  "description": string,
80  "updated": datetime,
81  "timeZone": string,
82  "accessRole": string,
83  "defaultReminders": [
84    {
85      "method": string,
86      "minutes": integer
87    }
88  ],
89  "nextPageToken": string,
90  "nextSyncToken": string,
91  "items": [
92    events Resource
93  ]
94}
95------ ------
96
97Event structure - https://developers.google.com/calendar/v3/reference/events#resource
98	- start.dateTime
99	- end.dateTime
100
101------ Token Refresh ------
102POST /token HTTP/1.1
103Host: oauth2.googleapis.com
104Content-Type: application/x-www-form-urlencoded
105
106client_id=[client_id]&
107client_secret=[client_secret]&
108refresh_token=[refresh_token]&
109grant_type=refresh_token
110------ Response ------
111{
112  "access_token": "1/fFAGRNJru1FTz70BzhT3Zg",
113  "expires_in": 3920,
114  "scope": "https://www.googleapis.com/auth/drive.metadata.readonly",
115  "token_type": "Bearer"
116}
117------ ------