add player response model

src/util.rs

@@ -1,6 +1,9 @@
 use fancy_regex::Regex;
 use rand::Rng;
 
+const CONTENT_PLAYBACK_NONCE_ALPHABET: &[u8; 64] =
+    b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
 /// Return the given capture group that matches first in a list of regexes
 pub fn get_cg_from_regexes<'a, I>(mut regexes: I, text: &str, cg: usize) -> Option<String>
 where
@@ -26,3 +29,11 @@ pub fn random_string(charset: &[u8], length: usize) -> String {
 
     result
 }
+
+pub fn generate_content_playback_nonce() -> String {
+    random_string(CONTENT_PLAYBACK_NONCE_ALPHABET, 16)
+}
+
+pub fn generate_t_parameter() -> String {
+    random_string(CONTENT_PLAYBACK_NONCE_ALPHABET, 12)
+}