(Ruby) X.com OAuth 2.0 Authorization Code with PKCE

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

For more information, see https://docs.x.com/resources/fundamentals/authentication/oauth-2-0/authorization-code

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# For more information about the OAuth2, see OAuth 2.0 Authorization Flow

oauth2 = Chilkat::CkOAuth2.new()

# The port should match the Authorized Redirect URL in your X.com app, 
# which would look like "http://127.0.0.1:3017/"
# See the screenshot below of the App Settings in the X Developer Portal
oauth2.put_LocalHost("127.0.0.1")
oauth2.put_ListenPort(3017)

oauth2.put_AuthorizationEndpoint("https://x.com/i/oauth2/authorize")
oauth2.put_TokenEndpoint("https://api.x.com/2/oauth2/token")

# Replace this with your actual X.com OAuth2 Client ID and Client Secret
oauth2.put_ClientId("OAUTH2_CLIENT_ID")
oauth2.put_ClientSecret("OAUTH2_CLIENT_SECRET")

# This is for Require Proof Key for Code Exchange (PKCE)
# See OAuth2 PKCE Explained
oauth2.put_CodeChallenge(true)
oauth2.put_CodeChallengeMethod("S256")

# Space separated scopes...
oauth2.put_Scope("tweet.read tweet.write users.read follows.read follows.write offline.access like.read like.write block.read block.write")

# Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
url = oauth2.startAuth()
if (oauth2.get_LastMethodSuccess() != true)
    print oauth2.lastErrorText() + "\n";
    exit
end

print "url = " + url + "\n";

# Launch the default browser on the system and navigate to the url.
# The LaunchBrowser method was added in Chilkat v10.1.2.
success = oauth2.LaunchBrowser(url)
if (success == false)
    print oauth2.lastErrorText() + "\n";
    exit
end

# Wait for the user to approve or deny authorization in the browser.
numMsWaited = 0
while (numMsWaited < 10000) and (oauth2.get_AuthFlowState() < 3)
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100
end

# 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 (oauth2.get_AuthFlowState() < 3)
    oauth2.Cancel()
    print "No response from the browser!" + "\n";
    exit
end

# 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 (oauth2.get_AuthFlowState() == 5)
    print "OAuth2 failed to complete." + "\n";
    print oauth2.failureInfo() + "\n";
    exit
end

if (oauth2.get_AuthFlowState() == 4)
    print "OAuth2 authorization was denied." + "\n";
    print oauth2.accessTokenResponse() + "\n";
    exit
end

if (oauth2.get_AuthFlowState() != 3)
    print "Unexpected AuthFlowState:" + oauth2.get_AuthFlowState().to_s() + "\n";
    exit
end

print "OAuth2 authorization granted!" + "\n";

json = Chilkat::CkJsonObject.new()
json.Load(oauth2.accessTokenResponse())
json.put_EmitCompact(false)

# If an "expires_on" member does not exist, then add the JSON member by
# getting the current system date/time and adding the "expires_in" seconds.
# This way we'll know when the token expires.
if (json.HasMember("expires_on") == false)
    dtExpire = Chilkat::CkDateTime.new()
    dtExpire.SetFromCurrentSystemTime()
    dtExpire.AddSeconds(json.IntOf("expires_in"))
    json.AppendString("expires_on",dtExpire.getAsUnixTimeStr(false))
end

print "Access Token Response = " + json.emit() + "\n";

# A sample access token response:

# {
#   "token_type": "bearer",
#   "expires_in": 7200,
#   "access_token": "VmNDLVZiYUZwejY5Mkx3RblFTmo3ek1leTRGclMuZFVOUTVUTWpNbVZKb1N5OjE3NDAxNjk4MDVxNTE6MToxOaF0OjE",
#   "scope": "block.read follows.read offline.access tweet.write block.write like.write like.read users.read tweet.read follows.write",
#   "refresh_token": "eThOWVVFSTRqdVp3QTFndGsxM2ZGZmFyNWVrU0phM1JKbGdrbGNWRGJzb1loOjE3NDAwMjk4MDUxNTI6MTowOnJ0OjE"
# }

print "Access Token = " + oauth2.accessToken() + "\n";

# Save the JSON access token response to a file for subsequent use..
json.WriteFile("qa_data/tokens/x.json")

#