fixing the login forgery process to work around nextcloud issue

src/account.rs

@@ -6,9 +6,10 @@ use rand::Rng;
 use rand::RngCore;
 use regex::Regex;
 use std::time::Duration;
+use std::collections::HashMap;
+use percent_encoding::percent_decode_str;
 
-use crate::config::PROXY_TIMEOUT;
-use crate::config::{ADJ_LIST, NAME_LIST};
+use crate::config::{PROXY_TIMEOUT, USER_AGENT, ADJ_LIST, NAME_LIST};
 use crate::debug;
 use crate::errors::{crash, TrainCrash};
 use crate::templates::get_lang;
@@ -142,11 +143,11 @@ pub async fn login(
 ) -> Result<HttpResponse, TrainCrash> {
     debug(&format!("Sending forged login for user {}", user));
 
-    // 1. GET /login
+    // 1. GET /csrftoken
     let mut login_get = client
-        .get(format!("{}/{}", CONFIG.nextcloud_url, "login"))
+        .get(format!("{}/{}", CONFIG.nextcloud_url, "csrftoken"))
         .timeout(Duration::new(PROXY_TIMEOUT, 0))
-        .header("User-Agent", "Actix-web")
+        .header("User-Agent", USER_AGENT)
         .send()
         .await
         .map_err(|e| {
@@ -156,22 +157,63 @@ pub async fn login(
 
     // rewrite cookie headers from GET to POST
     let mut str_cookiepair = String::new();
-    for h_value in login_get.headers().get_all("set-cookie") {
-        str_cookiepair = format!(
-            "{}; {}",
-            str_cookiepair,
-            h_value.clone().to_str().map_err(|e| {
-                eprintln!("error_login_cookiepair: {}", e);
-                crash(get_lang(&req), "error_login_cookiepair")
-            })?
-        );
+
+    // remove duplicate oc<id> cookie (nextcloud bug)
+    // leading to sncf being unable to forge logins
+    let cookie_set = login_get.headers().get_all("set-cookie");
+    let mut cookie_map: HashMap<String, String> = HashMap::new();
+    for c in cookie_set {
+        // get str version of cookie header
+        let c_str = c.to_str().map_err(|e| {
+            eprintln!("error_login_cookiepair (1): {}", e);
+            crash(get_lang(&req), "error_login_cookiepair")
+        })?;
+
+        // percent decode 
+        let c_str = percent_decode_str(c_str).decode_utf8_lossy();
+        
+        //then remove values after ';'
+        let c_str_arr = c_str.split(';').collect::<Vec<&str>>();
+
+        let c_str = c_str_arr.first()
+            .expect("error: cookiepair split does not have a first value. shouldn't happen.");
+
+        // split cookie key and cookie value
+        // split_once would work best but it's nightly-only for now
+        let c_str_arr = c_str.split('=').collect::<Vec<&str>>();
+
+        let c_key = c_str_arr.first()
+            .expect("error: cookie key split does not have a first value, shouldn't happen.");
+
+        let c_value = c_str.replace(&format!("{}=", c_key), "");
+
+        if c_key != c_str {
+            // if the key already exists in hashmap, replace its value
+            // else, insert it
+            if let Some(c_sel) = cookie_map.get_mut(*c_key) {
+                *c_sel = c_value;
+            }
+            else {
+                cookie_map.insert(c_key.to_string(), c_value);
+            }
+        }
+        else {
+            eprintln!("error_login_cookiepair (2)");
+            return Err(crash(get_lang(&req), "error_login_cookiepair"));
+        }
     }
 
+    for (cookie_k, cookie_v) in cookie_map {
+        str_cookiepair.push_str(&format!("{}={}; ", cookie_k, cookie_v));
+    }
+
+    println!("SET-COOKIE: {}", str_cookiepair);
+
     // load requesttoken regex
     lazy_static! {
-        static ref RE: Regex = Regex::new(r#"requesttoken="(?P<token>.*)""#)
+        static ref RE: Regex = Regex::new(r#"\{"token":"(?P<token>[^"]*)"\}"#)
             .expect("Error while parsing the requesttoken regex");
-    }
+        }
 
     let post_body = login_get.body().await.map_err(|e| {
         eprintln!("error_login_get_body: {}", e);
@@ -186,18 +228,18 @@ pub async fn login(
             eprintln!("error_login_regex (no capture)");
             crash(get_lang(&req), "error_login_regex")
         })?
-        .name("token")
+    .name("token")
         .ok_or_else(|| {
             eprintln!("error_login_regex (no capture named token)");
             crash(get_lang(&req), "error_login_regex")
         })?
-        .as_str();
+    .as_str();
 
     // 2. POST /login
     let mut login_post = client
         .post(format!("{}/{}", CONFIG.nextcloud_url, "login"))
         .timeout(Duration::new(PROXY_TIMEOUT, 0))
-        .header("User-Agent", "Actix-web");
+        .header("User-Agent", USER_AGENT);
 
     // include all NC cookies in one cookie (cookie pair)
     login_post = login_post.header("Cookie", str_cookiepair);
@@ -211,7 +253,7 @@ pub async fn login(
             timezone_offset: "2",
             requesttoken,
         })
-        .await
+    .await
         .map_err(|e| {
             eprintln!("error_login_post: {}", e);
             crash(get_lang(&req), "error_login_post")
@@ -219,6 +261,7 @@ pub async fn login(
 
     // 3. set the same cookies in the user's browser
     let mut user_response = HttpResponse::SeeOther();
+
     for item in response_post.headers().clone().get_all("set-cookie") {
         user_response.header(
             "Set-Cookie",