(Tcl) Quickbooks OAuth2 in a Desktop App

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Note: This example requires Chilkat v10.1.2 or greater.

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load ./chilkat.dll

# To further clarify, see OAuth 2.0 Authorization Flow

# ------------------------------------------------------------------------------------------------
# IMPORTANT: You first need to define an App in the Quickbooks Developer Dashboard.
# See How to Create an App in QuickBooks Developer Dashboard
# ------------------------------------------------------------------------------------------------

# This example is for desktop applicatons (it is not for code that runs on a web server).
# You'll need to add a line (or a few lines of code) to popup a web browser that navigates to a URL.

# This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
# repeatedly refreshed without user interaction, as shown in this example: Refresh Quickbooks OAuth2 Access Token.

set oauth2 [new_CkOAuth2]

# QuickBooks OAuth2 allows for an "http://localhost:<portNumber>/" callback URL for sandbox testing,
# but not for production.

# In production, your applicaton must use your own public web server as an intermediate
# to receive and forward the redirect to localhost.
# See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

CkOAuth2_put_AppCallbackUrl $oauth2 "https://yourwebserver.com/OAuth2.php"
CkOAuth2_put_ListenPort $oauth2 3017

CkOAuth2_put_AuthorizationEndpoint $oauth2 "https://appcenter.intuit.com/connect/oauth2"
CkOAuth2_put_TokenEndpoint $oauth2 "https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer"

# Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "QUICKBOOKS-CLIENT-ID"
CkOAuth2_put_ClientSecret $oauth2 "QUICKBOOKS-CLIENT-SECRET"
CkOAuth2_put_UseBasicAuth $oauth2 1
CkOAuth2_put_CodeChallenge $oauth2 0

# Indicate the desired access.  Possible scopes that can appear in the list are:
# com.intuit.quickbooks.accounting:  QuickBooks Online API
# com.intuit.quickbooks.payment:  QuickBooks Payments API
# openid:  OpenID Connect processing
# profile:  user's given and family names
# email:  user's email address
# phone:  user's phone number
# address:  user's physical address
CkOAuth2_put_Scope $oauth2 "com.intuit.quickbooks.accounting"

# Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
set url [CkOAuth2_startAuth $oauth2]
if {[CkOAuth2_get_LastMethodSuccess $oauth2] != 1} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

puts "url = $url"

# Launch the default browser on the system and navigate to the url.
# The LaunchBrowser method was added in Chilkat v10.1.2.
set success [CkOAuth2_LaunchBrowser $oauth2 $url]
if {$success == 0} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

# Wait for the user to approve or deny authorization in the browser.
set numMsWaited 0
while {expr [$numMsWaited < 90000]  &&  [[CkOAuth2_get_AuthFlowState $oauth2] < 3]} {
    CkOAuth2_SleepMs $oauth2 100
    set numMsWaited [expr $numMsWaited + 100]
}

# If the browser does not respond within the specified time, AuthFlowState will be:
# 
# 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
# 2: Waiting for Final Response – The thread is awaiting the final access token response.
# In either case, cancel the background task initiated by StartAuth.

if {[CkOAuth2_get_AuthFlowState $oauth2] < 3} then {
    CkOAuth2_Cancel $oauth2
    puts "No response from the browser!"
    delete_CkOAuth2 $oauth2
    exit
}

# Check AuthFlowState to determine if authorization was granted, denied, or failed:
# 
# 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
# 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
# 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if {[CkOAuth2_get_AuthFlowState $oauth2] == 5} then {
    puts "OAuth2 failed to complete."
    puts [CkOAuth2_failureInfo $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

if {[CkOAuth2_get_AuthFlowState $oauth2] == 4} then {
    puts "OAuth2 authorization was denied."
    puts [CkOAuth2_accessTokenResponse $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

if {[CkOAuth2_get_AuthFlowState $oauth2] != 3} then {
    puts "Unexpected AuthFlowState:[CkOAuth2_get_AuthFlowState $oauth2]"
    delete_CkOAuth2 $oauth2
    exit
}

# Save the full JSON access token response to a file.
set sbJson [new_CkStringBuilder]

CkStringBuilder_Append $sbJson [CkOAuth2_accessTokenResponse $oauth2]
CkStringBuilder_WriteFile $sbJson "qa_data/tokens/qb-access-token.json" "utf-8" 0

# The full JSON received looks like this:
# {
#   "expires_in": 3600,
#   "x_refresh_token_expires_in": 8726400,
#   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
#   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
#   "token_type": "bearer"
# }

puts "OAuth2 authorization granted!"
puts "Access Token = [CkOAuth2_accessToken $oauth2]"

# Get the realmId if needed...
# See About the QuickBooks REST API Realm ID, also known as Company ID
set realmId [CkOAuth2_getRedirectRequestParam $oauth2 "realmId"]
if {[CkOAuth2_get_LastMethodSuccess $oauth2] == 1} then {
    puts "realmId: $realmId"
} else {
    puts "No realmId was provided."
}


delete_CkOAuth2 $oauth2
delete_CkStringBuilder $sbJson