[Resolved] Help with URL encoding

Solar2D General Questions/Discussion
1

Hey all,

I’m trying to get Corona to talk to Parse via the REST API. It should be fairly simple but I’m missing something. The API looks like this…

curl -X GET \  
 -H "X-Parse-Application-Id: ID\_KEY" \  
 -H "X-Parse-REST-API-Key: API\_KEY" \  
 -G \  
 --data-urlencode 'username=testUser' \  
 --data-urlencode 'password=testPass' \  
 https://api.parse.com/1/login

What’s the right way to make this GET request from Corona?

[code]
local function login ()

– ?? I tried various versions of url.escape on the parameters but I’m obviously not getting the format

baseUrl = “https://api.parse.com/1/login”

network.request( baseUrl, “GET”, networkListener, params)

end
[/code] [import]uid: 1560 topic_id: 24102 reply_id: 324102[/import]

2

Looks like your web service endpoint uses custom HTTP headers for authentication (X-Parse-Application-Id and X-Parse-REST-API-Key) did you pass them in as headers?

This here shows an example on how to pass in http headers: http://developer.anscamobile.com/reference/index/networkrequest

For the query parameters (username/password), you could just append to the URL and URL encode them (https://api.parse.com/1/login?username=testuser&password=testPass). Your example code does not have any query parameters or HTTP headers specified, so I don’t think it could work.

Also you should check if your service supports to pass in username/password in HTTP body or Basic Auth HTTP header, that is nicer then in the URL

–wunderwuzzi

[import]uid: 118947 topic_id: 24102 reply_id: 97227[/import]

3

You may still need to encode the strings (takes out spaces, converts certain characters to a binary-safe value). Here are the urlencode/urldecode functions that I use:

local function urlencode(str)  
 if (str) then  
 str = string.gsub (str, "\n", "\r\n")  
 str = string.gsub (str, "([^%w])",  
 function (c) return string.format ("%%%02X", string.byte(c)) end)  
 str = string.gsub (str, " ", "+")  
 end  
 return str  
end  
  
function urldecode(str)  
 str = string.gsub (str, "+", " ")  
 str = string.gsub (str, "%%(%x%x)",  
 function(h) return string.char(tonumber(h,16)) end)  
 str = string.gsub (str, "\r\n", "\n")  
 return str  
end

[import]uid: 19626 topic_id: 24102 reply_id: 97235[/import]

4

Thanks for the suggestions. Yes, I’m passing the custom headers. I’ve been trying variations of URL encoding, using url.escape and the urlencodefunction.

I’m guessing the problem is either the username/password string just comes out with an extra slash somewhere or there’s a missing authentication header. I’ve tried username/password as a JSON object but that doesn’t work either.

This is what hasn’t worked…perhaps there should be no JSON header for the GET it’s just passing a string?

[code]
headers[“Content-Type”] = “application/json”
headers[“X-Parse-Application-Id”] = “TK” – your Application-Id
headers[“X-Parse-REST-API-Key”] = “TK” – your REST-API-Key

local function login (message)

baseUrl = “https://api.parse.com/1/login/”
message = escape(“username=testUser&password=testPass”)
–also tried urlencode (string)
params.body = message

network.request( baseUrl, “GET”, networkListener, params)

end
[/code] [import]uid: 1560 topic_id: 24102 reply_id: 97239[/import]

5

The curl example provided uses -G, which means the username/password is appended as query parameters (just a GET request)[1]. Maybe the services doesn’t support username/password in the body? Try to append it in the URL as query params and see if that works.

–wunderwuzzi
[1]
http://curl.haxx.se/docs/manpage.html

-G, --get

When used, this option will make all data specified with -d, --data or --data-binary to be used in a HTTP GET request instead of the POST request that otherwise would be used. The data will be appended to the URL with a ‘?’ separator. [import]uid: 118947 topic_id: 24102 reply_id: 97247[/import]

6

Thanks much. I got it to work. The problem was an incorrect header. I removed the JSON header and used Content-Type = application/x-www-form-urlencoded and it worked.

FWIW, http://.www.hurl.it was very helpful in diagnosing the issue. [import]uid: 1560 topic_id: 24102 reply_id: 97319[/import]

7

Great, glad to hear that you got it to work!

–wunderwuzzi [import]uid: 118947 topic_id: 24102 reply_id: 97360[/import]