PowerShell

Get a Google People API OAuth2 Access Token

See more Google People Examples

Demonstrates how to get a Google People OAuth2 access token from a desktop application or script. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$oauth2 = New-Object Chilkat.OAuth2

# For Google OAuth2, set the ListenPort equal to the port specified in the authorized callback URI for the ClientID.
# See http://cknotes.com/setup-google-account-for-google-drive-api-walkthrough/
$oauth2.ListenPort = 3017

$oauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
$oauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

# Replace these with actual values.
$oauth2.ClientId = "GOOGLE-CLIENT-ID"
$oauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"

$oauth2.CodeChallenge = $true
$oauth2.CodeChallengeMethod = "S256"

# See Google People API Scopes for more scopes.
$oauth2.Scope = "profile https://www.googleapis.com/auth/contacts https://www.googleapis.com/auth/contacts.other.readonly https://www.googleapis.com/auth/directory.readonly"

# Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2.StartAuth()
if ($oauth2.LastMethodSuccess -eq $false) {
    $($oauth2.LastErrorText)
    exit
}

# Launch the system's default browser navigated to the URL.
$success = $oauth2.LaunchBrowser($url)
if ($success -eq $false) {
    $($oauth2.LastErrorText)
    exit
}

# Now wait for the authorization.
# We'll wait for a max of 30 seconds.
$numMsWaited = 0
while (($numMsWaited -lt 30000) -and ($oauth2.AuthFlowState -lt 3)) {
    $oauth2.SleepMs(100)
    $numMsWaited = $numMsWaited + 100
}

# If there was no response from the browser within 30 seconds, then 
# the AuthFlowState will be equal to 1 or 2.
# 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
# 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
# In that case, cancel the background task started in the call to StartAuth.
if ($oauth2.AuthFlowState -lt 3) {
    $oauth2.Cancel()
    $("No response from the browser!")
    exit
}

# Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
# The possible AuthFlowState values are:
# 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
# 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
# 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if ($oauth2.AuthFlowState -eq 5) {
    $("OAuth2 failed to complete.")
    $($oauth2.FailureInfo)
    exit
}

if ($oauth2.AuthFlowState -eq 4) {
    $("OAuth2 authorization was denied.")
    $($oauth2.AccessTokenResponse)
    exit
}

if ($oauth2.AuthFlowState -ne 3) {
    $("Unexpected AuthFlowState:" + $oauth2.AuthFlowState)
    exit
}

# Save the full JSON access token response to a file.
$sbJson = New-Object Chilkat.StringBuilder
$sbJson.Append($oauth2.AccessTokenResponse)
$sbJson.WriteFile("qa_data/tokens/googlePeople.json","utf-8",$false)

# The saved JSON response looks like this:

# {
#   "access_token": "ya29.a0AfH6S ... LAZYFUkf0",
#   "expires_in": 3599,
#   "refresh_token": "1//0fL_Ov ... ee0",
#   "scope": "https://www.googleapis.com/auth/contacts",
#   "token_type": "Bearer"
# }

$("OAuth2 authorization granted!")
$("Access Token = " + $oauth2.AccessToken)