refactor: reorganize RPC modules into unified structure

crates/utils/src/string.rs

@@ -1,4 +1,5 @@
 use lazy_static::*;
+use rand::{Rng, RngCore};
 use regex::Regex;
 use std::io::{Error, Result};
 
@@ -306,6 +307,43 @@ pub fn parse_ellipses_range(pattern: &str) -> Result<Vec<String>> {
     Ok(ret)
 }
 
+pub fn gen_access_key(length: usize) -> Result<String> {
+    const ALPHA_NUMERIC_TABLE: [char; 36] = [
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
+        'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    ];
+
+    if length < 3 {
+        return Err(Error::other("access key length is too short"));
+    }
+
+    let mut result = String::with_capacity(length);
+    let mut rng = rand::rng();
+
+    for _ in 0..length {
+        result.push(ALPHA_NUMERIC_TABLE[rng.random_range(0..ALPHA_NUMERIC_TABLE.len())]);
+    }
+
+    Ok(result)
+}
+
+pub fn gen_secret_key(length: usize) -> Result<String> {
+    use base64_simd::URL_SAFE_NO_PAD;
+
+    if length < 8 {
+        return Err(Error::other("secret key length is too short"));
+    }
+    let mut rng = rand::rng();
+
+    let mut key = vec![0u8; URL_SAFE_NO_PAD.estimated_decoded_length(length)];
+    rng.fill_bytes(&mut key);
+
+    let encoded = URL_SAFE_NO_PAD.encode_to_string(&key);
+    let key_str = encoded.replace("/", "+");
+
+    Ok(key_str)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;