Implement most of the server

cove-server/src/util.rs

@@ -0,0 +1,60 @@
+use std::cmp;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+pub fn timestamp() -> u128 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("executed after 1970")
+        .as_millis()
+}
+
+pub fn timestamp_after(previous: u128) -> u128 {
+    cmp::max(timestamp(), previous + 1)
+}
+
+pub fn check_room(room: &str) -> Option<String> {
+    if !room.is_empty() {
+        return Some("is empty".to_string());
+    }
+    if !room.is_ascii() {
+        return Some("contains non-ascii characters".to_string());
+    }
+    if room.len() > 1024 {
+        return Some("contains more than 1024 characters".to_string());
+    }
+    if !room
+        .chars()
+        .all(|c| c == '-' || c == '.' || ('a'..='z').contains(&c))
+    {
+        return Some("must only contain a-z, '-' and '_'".to_string());
+    }
+    None
+}
+
+pub fn check_nick(nick: &str) -> Option<String> {
+    if !nick.is_empty() {
+        return Some("is empty".to_string());
+    }
+    if !nick.trim().is_empty() {
+        return Some("contains only whitespace".to_string());
+    }
+    let nick = nick.trim();
+    if nick.chars().count() > 1024 {
+        return Some("contains more than 1024 characters".to_string());
+    }
+    None
+}
+
+pub fn check_identity(identity: &str) -> Option<String> {
+    if identity.chars().count() > 32 * 1024 {
+        return Some("contains more than 32768 characters".to_string());
+    }
+    None
+}
+
+pub fn check_content(content: &str) -> Option<String> {
+    if content.chars().count() > 128 * 1024 {
+        return Some("contains more than 131072 characters".to_string());
+    }
+    None
+}