I want to create an iOS Application that logs into a website and parses the data from several pages of that site, while maintaining the login session.This is what I have done so far. I send a GET request to retrieve the EVENTVALIDATON and VIEWSTATE parameters required for the POST request. (I looked at the POST by using 'Firebug'). When I run the following code, it gives back the same login page. But it should be giving me this page.
var parameter: Parameters = [:]
var viewstate: String = ""
var eventvalidation: String =
@IBAction func postRequest(_ sender: Any) {
Alamofire.request("https://ecampus.psgtech.ac.in/studzone/AttWfLoginPage.aspx").responseString { response in
print("\(response.result.isSuccess)")
if let html = response.result.value {
if let doc = Kanna.HTML(html: html, encoding: String.Encoding.utf8) {
// Search for nodes by CSS selector
for show in doc.css("input[id='__VIEWSTATE']") {
self.viewstate=show["value"]!
//print(show["value"] as Any)
}
for show in doc.css("input[id='__EVENTVALIDATION']") {
self.eventvalidation=show["value"]!
//print(show["value"] as Any)
}
}
}
//creating dictionary for parameters
self.parameter = ["__EVENTTARGET":"",
"__EVENTARGUMENT":"",
"__LASTFOCUS":"",
"__VIEWSTATE":self.viewstate,
"__EVENTVALIDATION":self.eventvalidation,
"rdolst":"S",
"Txtstudid":"<myrollno>",
"TxtPasswd":"<mypassword>",
"btnlogin":"Login"
]
}
Alamofire.request ("https://ecampus.psgtech.ac.in/studzone/AttWfLoginPage.aspx",method: .post, parameters: self.parameter, headers: headers).responseString { response in
print("\(response.result.isSuccess)")
print(response)
}
To be honest, I'm very new to requests and parsing data(I have finished the parsing part separately though). I did some more research and read about headers and cookies.So after checking the headers, the initial GET request by the browser has a response header of
Cache-Control : private
Content-Encoding : gzip
Content-Length : 4992
Content-Type : text/html; charset=utf-8
Date : Sun, 18 Jun 2017 14:25:50 GMT
Server : Microsoft-IIS/8.0
Set-Cookie : .ASPXAUTH=; expires=Mon, 11-Oct-1999 18:30:00 GMT; path=/; HttpOnly
Vary : Accept-Encoding
X-AspNet-Version : 4.0.30319
X-Powered-By : ASP.NET
and Request Header of
Accept : text/html,application/xhtml+xml,application/xml;q=0.9;q=0.8
Accept-Encoding : gzip, deflate, br
Accept-Language : en-US,en;q=0.5
Connection : keep-alive
Cookie : ASP.NET_SessionId=urzugt0zliwkmz3ab1fxx1ja
Host : ecampus.psgtech.ac.in
Upgrade-Insecure-Requests : 1
User-Agent : Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/20100101 Firefox/54.0`
The problem is I don't understand how a initial GET request can have a token with it. If request happens first, response should be the one containing the token? I don't know what I am doing wrong and how to get this working. I don't know if I am missing something altogether. I came here only after trying everything I could think of. Any help would be appreciated. Thank you.
