Move migration related userdata functions to a new file

src/router/userdata/user/migration.rs

@@ -0,0 +1,69 @@
+use rusqlite::params;
+use json::{JsonValue, object};
+use crate::router::userdata;
+use rand::Rng;
+use sha2::{Digest, Sha256};
+use base64::{Engine as _, engine::general_purpose};
+
+pub fn get_acc_transfer(uid: i64, token: &str, password: &str) -> JsonValue {
+    let database = userdata::get_userdata_database();
+    let data = database.lock_and_select("SELECT password FROM migration WHERE token=?1", params!(token));
+    if data.is_err() {
+        return object!{success: false};
+    }
+    if verify_password(password, &data.unwrap()) {
+        let login_token = userdata::get_login_token(uid);
+        if login_token == String::new() {
+            return object!{success: false};
+        }
+        return object!{success: true, login_token: login_token};
+    }
+    object!{success: false}
+}
+
+pub fn save_acc_transfer(token: &str, password: &str) {
+    let database = userdata::get_userdata_database();
+    database.lock_and_exec("DELETE FROM migration WHERE token=?1", params!(token));
+    database.lock_and_exec("INSERT INTO migration (token, password) VALUES (?1, ?2)", params!(token, hash_password(password)));
+}
+
+fn generate_salt() -> Vec<u8> {
+    let mut rng = rand::rng();
+    let mut bytes = vec![0u8; 16];
+    rng.fill(&mut bytes[..]);
+    bytes
+}
+
+fn hash_password(password: &str) -> String {
+    let salt = &generate_salt();
+    let mut hasher = Sha256::new();
+    hasher.update(password.as_bytes());
+    hasher.update(salt);
+    let hashed_password = hasher.finalize();
+
+    let salt_hash = [&salt[..], &hashed_password[..]].concat();
+    general_purpose::STANDARD.encode(salt_hash)
+}
+
+pub fn verify_password(password: &str, salted_hash: &str) -> bool {
+    if password.is_empty() || salted_hash.is_empty() {
+        return false;
+    }
+    let bytes = general_purpose::STANDARD.decode(salted_hash);
+    if bytes.is_err() {
+        return password == salted_hash;
+    }
+    let bytes = bytes.unwrap();
+    if bytes.len() < 17 {
+        return password == salted_hash;
+    }
+    let (salt, hashed_password) = bytes.split_at(16);
+    let hashed_password = &hashed_password[0..32];
+
+    let mut hasher = Sha256::new();
+    hasher.update(password.as_bytes());
+    hasher.update(salt);
+    let input_hash = hasher.finalize();
+
+    input_hash.as_slice() == hashed_password
+}