Android Question How do I form this HTTPutils request?

NeoTechni · Aug 16, 2013

Obtain a bearer token
The value calculated in step 1 must be exchanged for a bearer token by issuing a request to POST oauth2/token:

The request must be a HTTP POST request.
The request must include an Authorization header with the value of Basic <base64 encoded value from step 1>.
The request must include a Content-Type header with the value of application/x-www-form-urlencoded;charset=UTF-8.
The body of the request must be grant_type=client_credentials.

Example request (Authorization header has been wrapped):

POST /oauth2/token HTTP/1.1
Host: api.twitter.com
User-Agent: My Twitter App v1.0.23
Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
Content-Type: application/x-www-form-urlencoded;charset=UTF-8
Content-Length: 29
Accept-Encoding: gzip

grant_type=client_credentials

I have most of that done, it's just the "body of the request" I don't know how to do

B4X:

Sub EncodeTwitterConsumerKeyAndSecret(Key As String, Secret As String)
    Dim STRutils As StringUtils , BYTutils As ByteConverter ,tempstr As String
    tempstr = STRutils.EncodeUrl(Key, "UTF8") & ":" & STRutils.EncodeUrl(Secret, "UTF8")
    TwitterEncodedKey = STRutils.EncodeBase64( BYTutils.StringToBytes(tempstr, "UTF8"))
End Sub

'What I have so far:
HttpUtils.PostString("Twitter", "https://api.twitter.com/oauth2/token", "Authorization=Basic " & TwitterEncodedKey & "&Content-Type=application/x-www-form-urlencoded;charset=UTF-8")

Erel · Aug 16, 2013

Why are you using HttpUtils instead of HttpUtils2?

Immediately after sending the request you should call Job.GetRequest.SetHeader to set the two headers.

NeoTechni · Aug 16, 2013

Cause I was using HTTPutils and didnt want to have to change any existing code.

Job.GetRequest.SetHeader will let me set the body of the request to grant_type=client_credentials?

Erel · Aug 16, 2013

The body of the request is not a header it is the POST value.

The Authorization and the ContentType are headers.

NeoTechni · Aug 16, 2013

It says "The body of the request must be grant_type=client_credentials." though. I don't know how to do that.

NeoTechni · Aug 17, 2013

Erel said:
Why are you using HttpUtils instead of HttpUtils2?

Immediately after sending the request you should call Job.GetRequest.SetHeader to set the two headers.

I'm not seeing those methods either.
And I'm trying the request using wfetch, and it needs "grant_type=client_credentials" separated by an empty line from the other post values.

NeoTechni · Aug 17, 2013

Another problem has arisen. Since the Base64 encoded text will end in an = sign, won't it mess up the rest of the POST data?
Should encodeURL deal with it?

sirjo66 · Aug 17, 2013

mmmmmmmmmmm ......

I think that you can't use Content-Type: application/x-www-form-urlencoded,
may be that you need to use Content-Type: multipart/form-data

Here an example: http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4

Or you can try url-encode your data.

Sergio

gfichter · Aug 17, 2013

This is my exact problem. How do you set the content type using the HttpUtils2 library? I need to set my content type to application/xml

Erel · Aug 17, 2013

@gfichter please start a new thread for your question.

An example of a multipart request is available here: http://www.b4x.com/android/forum/threads/multipart-formdata.30873/#post-179487

NeoTechni · Aug 17, 2013

I don't know why twitter went out of their way to make this a pain in the ass.
If "grant_type=client_credentials" was a post value rather than the body, I could do it. (Or not required at all...)
If it used HTTP instead of HTTPS, I could do it.
URL encoding the Base64 string doesn't appear to work.
But combined I have no idea how. I have the SocketSSL library, but I can't find documentation on it.

Erel · Aug 18, 2013

You do not need to use SocketSSL. There should be no difference between a Http request and Https request.

NeoTechni · Aug 18, 2013

I meant i was going to telnet in and give the raw data since i cant get httputils to give me access to a post requests body

Erel · Aug 18, 2013

You can send any POST body you need with HttpUtils2.

NeoTechni · Aug 18, 2013

But then id have to change a ton of code...

NeoTechni · Aug 18, 2013

Can i have both in one project?

Erel · Aug 18, 2013

You can use both HttpUtils2 and HttpUtils in the same project.

NeoTechni · Aug 18, 2013

Thank you

NeoTechni · Aug 18, 2013

B4X:

Sub GetTwitterAccessCode(Job As HttpJob, TargetModule As Object)
    'Dim SSL As SocketSSL
    'SSL.Initialize("SSL")
    'SSL.Connect("api.twitter.com", 443, 20)
    Dim tempstr As StringBuilder , BYTutils As ByteConverter
    tempstr.Initialize
    tempstr.Append("User-Agent: LCARS UI\r\n")
    tempstr.Append("Authorization: Basic " & TwitterEncodedKey & "\r\n")
    tempstr.Append("Content-Type: application/x-www-form-urlencoded;charset=UTF-8\r\n")
    tempstr.Append("Content-Length: 29\r\n")
    tempstr.Append("Accept-Encoding: gzip\r\n")
    tempstr.Append("\r\n")
    tempstr.Append("grant_type=client_credentials")
  
    Job.Initialize("Twitter", TargetModule)
    Job.GetRequest.InitializePost2("https://api.twitter.com/oauth2/token", BYTutils.StringToBytes(tempstr.ToString, "UTF8") )
End Sub

I am lost at this point...

I also tried:

B4X:

Sub GetTwitterAccessCode(Job As HttpJob, TargetModule As Object)
    'Dim SSL As SocketSSL
    'SSL.Initialize("SSL")
    'SSL.Connect("api.twitter.com", 443, 20)
    Dim tempstr As StringBuilder , BYTutils As ByteConverter
    tempstr.Initialize
    tempstr.Append("User-Agent: LCARS UI" & CRLF)
    tempstr.Append("Authorization: Basic " & TwitterEncodedKey & CRLF)
    tempstr.Append("Content-Type: application/x-www-form-urlencoded;charset=UTF-8" & CRLF)
    tempstr.Append("Content-Length: 29" & CRLF)
    tempstr.Append("Accept-Encoding: text/plain" & CRLF)
    tempstr.Append(CRLF)
    tempstr.Append("grant_type=client_credentials")
   
    Job.Initialize("Twitter", TargetModule)
    Job.PostString("https://api.twitter.com/oauth2/token", "User-Agent=LCARS UI")
    Log(tempstr.ToString)
   
    Job.GetRequest.InitializePost2("https://api.twitter.com/oauth2/token", BYTutils.StringToBytes(tempstr.ToString, "UTF8") )
End Sub

Erel · Aug 18, 2013

A POST request is made of headers and payload (or body). All the first five fields you posted are headers. You should set them by calling Job.GetRequest.SetHeader.

If I understand correctly only the last line (grant_type=...) is the body.

Android Question How do I form this HTTPutils request?

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