OpenEuphoria

2. Re: Euphoria SOAP client

• Posted by euphoric (admin) Jan 18, 2009
• 1391 views

I recently wrote code that lets me do ecommerce transactions with PayPal, during which you have to send form POST data back to them. I'm using wget for that and it works very well, though I'm sure there's a library available that would let me skip the step of saving the result into a file and then reading it into a variable. Other than that, I'm satisfied with using wget for this.

I hope in the future to use an integrated Euphoria library that does not require an external program like wget.

Here's a little snippet to show how simple can be interface wise:

if SANDBOX then -- when doing transaction testing 
	confirm = "cmd=_notify-synch&tx=" & pptx & "&at=" & my_code 
	pp_site = "https://www.sandbox.paypal.com/cgi-bin/webscr" 
else -- when doing live transactions 
	confirm = "cmd=_notify-synch&tx=" & pptx & "&at=" & my_code 
	pp_site = "https://www.paypal.com/cgi-bin/webscr" 
end if 
 
result = getURL( pp_site, {"--post-data \"" & confirm & "\"","--no-check-certificate"}) 

The --post-data parameter tells wget to send it as a form POST instead of as GET. result ends up containing the text of the URL grabbed (in the case above, the URL stored in pp_site).

4. Re: Euphoria SOAP client

• Posted by euphoric (admin) Jan 18, 2009
• 1407 views
• Last edited Jan 19, 2009

Yeah, I just haven't gotten around to using it.

Soon, I hope!

6. Re: Euphoria SOAP client

• Posted by Jules Jan 28, 2009
• 1349 views

If someone could show me an example of using POST with socket.e, I'd be eternally grateful. I'm going nowhere fast. :(

8. Re: Euphoria SOAP client

• Posted by Bellthorpe Jan 31, 2009
• 1388 views
• Last edited Feb 01, 2009

Keep in mind that POST and GET are two different ways of doing the same thing. I mention this because it makes it easier to understand the way in which you interface with a CGI server, which the SOAP server is.

To take an example, go to this page of mine:

http://www.wazu.jp/hosting/pricing.exu

Fill in a few forms, tick a few boxes, and hit 'Price This Plan'.

You have just sent data to my server using POST.

Now enter:

http://www.wazu.jp/hosting/pricing.exu?&email_count=7&disk_count=100&transfer_count=33&sql_count=3&multi_count=1&billing_currency=JPY&price_me=Price+or+Re-Price+This+Plan&domain_name=+&given_name=+&family_name=+&country=+&email=+&email_check=+

in the address bar.

You have just sent data to my server using a GET.

Note what's in the url and what's displayed on the page.

When large amounts of data are involved, POST is more appropriate. But you can see that essentially the same data are sent in each case.

For SOAP, you have to generate your XML, and send it to the CGI interface, using POST.

I use a Euphoria implementation of libcurl, and have one program that does webscraping, using POST, daily.

Here is an extract of the code, to show you how easy it is. The program is a few thousand lines long, but I've just extracted the relevant libcurl statements.

include C:\EUPHORIA\INCLUDE\euLibCurl.ew 
 
atom curl_handle 
atom errp -- curl error 
errp = allocate(CURL_ERROR_SIZE) 
 
 
--**************************************************************** 
--**********           function get_url           **************** 
--**************************************************************** 
function get_url(sequence url, object form_data) 
-- form_data can be NO_FORMS 
-- returns HTML page or error code 
object buffer, buffer2 
if connexion_mode = SOCKS then 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5) 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXY, "127.0.0.1:4567") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEFILE, "C:\\EUPHORIA\\accounts\\SOCKS_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEJAR, "C:\\EUPHORIA\\accounts\\SOCKS_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)") 
elsif connexion_mode = Proxy then 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP) 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXY, "192.168.0.1:4480") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEFILE, "C:\\EUPHORIA\\accounts\\Proxy_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEJAR, "C:\\EUPHORIA\\accounts\\Proxy_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4") 
else -- Direct 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP) 
	void = curl_easy_setopt(curl_handle, CURLOPT_PROXY, "") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEFILE, "C:\\EUPHORIA\\accounts\\Direct_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_COOKIEJAR, "C:\\EUPHORIA\\accounts\\Direct_cookies") 
	void = curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "Opera/9.21 (Windows NT 5.1; U; en)") 
end if 
 
void = curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYPEER, 0) 
-- CURLOPT_CAINFO and CURLOPT_CAPATH would be used to point to certificates, 
-- but the line above says not to verify the SSL certificate 
 
if sequence (form_data) then 
	void = curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, form_data) 
else 
	void = curl_easy_setopt(curl_handle, CURLOPT_HTTPGET, 1) 
end if 
 
void = curl_easy_setopt(curl_handle, CURLOPT_URL, url) 
if sequence(form_data) then 
	showMessage(sprintf("Downloading file %s : %s",{url,form_data})) 
else 
	showMessage(sprintf("Downloading file %s",{url})) 
end if 
buffer = curl_easy_perform_ex(curl_handle) 
if atom(buffer) then 
	showMessage(sprintf("Error '%s' downloading file", {peek_sequence(errp, CURL_ERROR_SIZE) } ) ) 
end if 
return buffer 
end function 
-------------------------------------------------------------------------------- 
 
curl_easy_cleanup(curl_handle) 
curl_global_cleanup() 
free(errp) 
 
if  curl_global_init(CURL_GLOBAL_ALL) != 0 then 
	warnErr("Could not initialise libCurl\n\nContinue?") 
end if 
 
curl_handle = curl_easy_init() 
void = curl_easy_setopt(curl_handle, CURLOPT_ERRORBUFFER, errp) 
void = curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1) 

10. Re: Euphoria SOAP client

• Posted by CraigWelch Feb 02, 2009
• 1295 views

No problem. I should mention that Eulibcurl is available for Linux.

Perl does have some available routines, but rather than learn a new language, I think I'd persevere with Euphoria.

In any case, I expect I'll have to write some SOAP stuff towards the end of the year, so it would be good if you kept this forum up to date with your progress.

There are of course routines for generating / parsing XML, such as Eebax.

Craig

12. Re: Euphoria SOAP client

• Posted by CraigWelch Feb 02, 2009
• 1339 views

Jules,

I tried to email you the package, to pipex and toucansurf, but both bounced. You can email me from the url I provided earlier in this thread if you'd like me to send it to you.

It's Ray Smith's package, enhanced by Julio C. Galaret Viera, who uses it on Linux.

From the code:

if platform() = WIN32 then 
    libcURL = link_dll("C:\\EUPHORIA\\INCLUDE\\libcurl.dll") 
elsif platform() = LINUX or platform() = FREEBSD then 
    libcURL = link_dll("libcurl.so") 
end if 

Most Linux distos have libcurl installed. Try slocate libcurl and/or man libcurl. Current downloads of the package are here.

In any case, even wget supports POST operations. My preference is libcurl.

I'm not trying to talk you out of using Perl, just suggesting that the CGI client interface in Euphoria is not all that difficult. I would suggest that you have three tasks ahead of you:

1. Use a program such as eulibcurl to prove that you can fetch data from a CGI enabled host using POST [1]
2. Use a program such as eebax to learn how to generate and parse XML
3. Tie them together to make your SOAP connexion.

[1] I'm happy to give you server space for a while if you want to experiment with both sides of the CGI interface.

Craig

14. Re: Euphoria SOAP client

• Posted by Jules Feb 03, 2009
• 1360 views

Thanks Craig. I'll email you. For anyone interested in testing SOAP (or REST), there is some handy software here: http://www.soapui.org/