Android Question How do I form this HTTPutils request?

[NeoTechni]

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

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]

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]

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]

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

The Authorization and the ContentType are headers.

 

[NeoTechni]

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

 

[NeoTechni]

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]

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]

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]

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]

@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]

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]

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

 

[NeoTechni]

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]

You can send any POST body you need with HttpUtils2.

 

[NeoTechni]

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

 

[NeoTechni]

Can i have both in one project?

 

[Erel]

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

 

[NeoTechni]

Thank you

 

[NeoTechni]

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:

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]

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.