(PowerShell) GeoOp OAuth2 Authorisation Code Grant (Public App)

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow.

Note: This example requires Chilkat v9.5.0.63 or greater.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# Note: This example requires Chilkat v9.5.0.63 or greater.

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

$oauth2 = New-Object Chilkat.OAuth2

# This should match the Site URL configured for your GeoOp Application, such as "http://localhost:3017/"
$oauth2.ListenPort = 3017

$oauth2.AuthorizationEndpoint = "https://login.geoop.com/oauth2/code"
$oauth2.TokenEndpoint = "https://login.geoop.com/oauth2/token"

# Replace the client ID with an actual value.
$oauth2.ClientId = "GEOOP-CLIENT-ID"
# The ClientSecret should remain empty for a GeoOp public application
$oauth2.ClientSecret = ""

# We need a few special settings for GeoOp
$oauth2.Scope = "default"
$oauth2.CodeChallenge = $false
# Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
# Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
# number matches the ListenPort above.
$oauth2.LocalHost = "none"

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

# At this point, your application should load the URL in a browser.
# For example, 
# in C#:  System.Diagnostics.Process.Start(url);
# in Java: Desktop.getDesktop().browse(new URI(url));
# in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
#              wsh.Run url
# in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
# in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
# The GeoOp account owner would interactively accept or deny the authorization request.
# System.Diagnostics.Process.Start(url);

# Add the code to load the url in a web browser here...
# Add the code to load the url in a web browser here...
# Add the code to load the url in a web browser here...

# 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
}

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

# Save the entire JSON response, which includes the access token, for future calls.
# The JSON AccessTokenResponse looks like this:
# {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

$fac = New-Object Chilkat.FileAccess
$fac.WriteEntireTextFile("qa_data/tokens/geoop.json",$oauth2.AccessTokenResponse,"utf-8",$false)

$("Success.")