feat(server):增加工具函数。

license_server/src/utils.rs

@@ -1,3 +1,5 @@
+use rand::{seq::SliceRandom, thread_rng};
+
 pub fn empty_to_none<S: Into<String>>(s: S) -> Option<String> {
     let s = s.into();
     if s.is_empty() {
@@ -6,3 +8,18 @@ pub fn empty_to_none<S: Into<String>>(s: S) -> Option<String> {
         Some(s)
     }
 }
+
+const RAND_LINCENSE_STR_SRC: &str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+pub fn generate_product_license_id() -> String {
+    let choices = RAND_LINCENSE_STR_SRC.as_bytes();
+    let mut rng = thread_rng();
+    let mut code: Vec<String> = vec![];
+    while code.len() < 10 {
+        match choices.choose(&mut rng) {
+            Some(c) => code.push(String::from_utf8(vec![*c]).unwrap()),
+            None => continue,
+        }
+    }
+    code.join("")
+}