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(CkPython) Trello OAuth1 Authorization

Demonstrates OAuth1 authentication for Trello.

Chilkat Python Downloads

Python Module for Windows, Linux, Alpine Linux,
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import sys
import chilkat

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

consumerKey = "TRELLO_CONSUMER_KEY"
consumerSecret = "TRELLO_CONSUMER_SECRET"

requestTokenUrl = "https://trello.com/1/OAuthGetRequestToken"
authorizeUrl = "https://trello.com/1/OAuthAuthorizeToken"
accessTokenUrl = "https://trello.com/1/OAuthGetAccessToken"

# The port number is picked at random. It's some unused port that won't likely conflict with anything else..
callbackUrl = "http://localhost:3017/"
callbackLocalPort = 3017

# The 1st step in 3-legged OAuth1.0a is to send a POST to the request token URL to obtain an OAuth Request Token
http = chilkat.CkHttp()

http.put_OAuth1(True)
http.put_OAuthConsumerKey(consumerKey)
http.put_OAuthConsumerSecret(consumerSecret)
http.put_OAuthCallback(callbackUrl)

req = chilkat.CkHttpRequest()
# resp is a CkHttpResponse
resp = http.PostUrlEncoded(requestTokenUrl,req)
if (http.get_LastMethodSuccess() != True):
    print(http.lastErrorText())
    sys.exit()

# If successful, the resp.BodyStr contains something like this:  
# oauth_token=c173ff088a09a67389a42b1ee22366a4&oauth_token_secret=717e6015c6749fe050a923516e739dbb&oauth_callback_confirmed=true
print(resp.bodyStr())

hashTab = chilkat.CkHashtable()
hashTab.AddQueryParams(resp.bodyStr())

requestToken = hashTab.lookupStr("oauth_token")
requestTokenSecret = hashTab.lookupStr("oauth_token_secret")
http.put_OAuthTokenSecret(requestTokenSecret)

print("oauth_token = " + requestToken)
print("oauth_token_secret = " + requestTokenSecret)

# ---------------------------------------------------------------------------
# The next step is to form a URL to send to the authorizeUrl
# This is an HTTP GET that we load into a popup browser.
sbUrlForBrowser = chilkat.CkStringBuilder()
sbUrlForBrowser.Append(authorizeUrl)
sbUrlForBrowser.Append("?oauth_token=")
sbUrlForBrowser.Append(requestToken)
sbUrlForBrowser.Append("&scope=read,write,account")

url = sbUrlForBrowser.getAsString()

print("url = " + url)

# When the urlForBrowser is loaded into a browser, the response from Trello will redirect back to localhost:3017
# We'll need to start a socket that is listening on port 3017 for the callback from the browser.
listenSock = chilkat.CkSocket()

backLog = 5
success = listenSock.BindAndListen(callbackLocalPort,backLog)
if (success != True):
    print(listenSock.lastErrorText())
    sys.exit()

# Wait for the browser's connection in a background thread.
# (We'll send load the URL into the browser following this..)
# Wait a max of 60 seconds before giving up.
maxWaitMs = 60000
# task is a CkTask
task = listenSock.AcceptNextConnectionAsync(maxWaitMs)
task.Run()

#  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(urlForBrowser));
# in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
#               wsh.Run urlForBrowser
# 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 Trello account owner would interactively accept or deny the authorization request.

#  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...
# System.Diagnostics.Process.Start(urlForBrowser);

# Wait for the listenSock's task to complete.
success = task.Wait(maxWaitMs)
if (not success or (task.get_StatusInt() != 7) or (task.get_TaskSuccess() != True)):
    if (not success):
        # The task.LastErrorText applies to the Wait method call.
        print(task.lastErrorText())
    else:
        # The ResultErrorText applies to the underlying task method call (i.e. the AcceptNextConnection)
        print(task.status())
        print(task.resultErrorText())

    sys.exit()

# If we get to this point, the connection from the browser arrived and was accepted.

# We no longer need the listen socket...
# Stop listening on port 3017.
listenSock.Close(10)

# First get the connected socket.
sock = chilkat.CkSocket()
sock.LoadTaskResult(task)

# Read the start line of the request..
startLine = sock.receiveUntilMatch("\r\n")
if (sock.get_LastMethodSuccess() != True):
    print(sock.lastErrorText())
    sys.exit()

# Read the request header.
requestHeader = sock.receiveUntilMatch("\r\n\r\n")
if (sock.get_LastMethodSuccess() != True):
    print(sock.lastErrorText())
    sys.exit()

# The browser SHOULD be sending us a GET request, and therefore there is no body to the request.
# Once the request header is received, we have all of it.
# We can now send our HTTP response.
sbResponseHtml = chilkat.CkStringBuilder()
sbResponseHtml.Append("<html><body><p>Chilkat thanks you!</b></body</html>")

sbResponse = chilkat.CkStringBuilder()
sbResponse.Append("HTTP/1.1 200 OK\r\n")
sbResponse.Append("Content-Length: ")
sbResponse.AppendInt(sbResponseHtml.get_Length())
sbResponse.Append("\r\n")
sbResponse.Append("Content-Type: text/html\r\n")
sbResponse.Append("\r\n")
sbResponse.AppendSb(sbResponseHtml)

sock.SendString(sbResponse.getAsString())
sock.Close(50)

# The information we need is in the startLine.
# For example, the startLine will look something like this:
#  GET /?oauth_token=c173ff088a09a67389b42b1ee32366a4&oauth_verifier=c65bc8eed882e04bb94023bb12c0dbef HTTP/1.1
sbStartLine = chilkat.CkStringBuilder()
sbStartLine.Append(startLine)
numReplacements = sbStartLine.Replace("GET /?","")
numReplacements = sbStartLine.Replace(" HTTP/1.1","")
sbStartLine.Trim()

# oauth_token=c173ff088a09a67389b42b1ee32366a4&oauth_verifier=c65bc8eed882e04bb94023bb12c0dbef
print("startline: " + sbStartLine.getAsString())

hashTab.Clear()
hashTab.AddQueryParams(sbStartLine.getAsString())

requestToken = hashTab.lookupStr("oauth_token")
authVerifier = hashTab.lookupStr("oauth_verifier")

# ------------------------------------------------------------------------------
# Finally , we must exchange the OAuth Request Token for an OAuth Access Token.

http.put_OAuthToken(requestToken)
http.put_OAuthVerifier(authVerifier)
# resp is a CkHttpResponse
resp = http.PostUrlEncoded(accessTokenUrl,req)
if (http.get_LastMethodSuccess() != True):
    print(http.lastErrorText())
    sys.exit()

# Make sure a successful response was received.
if (resp.get_StatusCode() != 200):
    print(resp.statusLine())
    print(resp.header())
    print(resp.bodyStr())
    sys.exit()

# If successful, the resp.BodyStr contains something like this:
# oauth_token=4618e19f5101b7199f75aA9e678d1585576ad84fb89fa40c85c4da13589010d5&oauth_token_secret=64a997b26ea1f47105eca36ce1a5d22e
print("response BodyStr = " + resp.bodyStr())

hashTab.Clear()
hashTab.AddQueryParams(resp.bodyStr())

accessToken = hashTab.lookupStr("oauth_token")
accessTokenSecret = hashTab.lookupStr("oauth_token_secret")

# The access token + secret is what should be saved and used for
# subsequent REST API calls.
print("Access Token = " + accessToken)
print("Access Token Secret = " + accessTokenSecret)

# Save the access token for subsequent REST API calls.
json = chilkat.CkJsonObject()
json.AppendString("oauth_token",accessToken)
json.AppendString("oauth_token_secret",accessTokenSecret)

fac = chilkat.CkFileAccess()
fac.WriteEntireTextFile("qa_data/tokens/trello.json",json.emit(),"utf-8",False)

print("Success.")

 

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