First working version

src/util.rs

@@ -0,0 +1,84 @@
+///
+/// Macros
+///
+#[macro_export]
+macro_rules! err {
+    ($expr:expr) => {{
+        err_json!(json!($expr));
+    }}
+}
+
+#[macro_export]
+macro_rules! err_json {
+    ($expr:expr) => {{
+        println!("ERROR: {}", $expr);
+        return Err($crate::rocket::response::status::BadRequest(Some($crate::rocket_contrib::Json($expr))));
+    }}
+}
+
+#[macro_export]
+macro_rules! err_handler {
+    ($expr:expr) => {{
+        println!("ERROR: {}", $expr);
+        return $crate::rocket::Outcome::Failure(($crate::rocket::http::Status::Unauthorized, $expr));
+    }}
+}
+
+///
+/// File handling
+///
+
+use std::path::Path;
+use std::io::Read;
+use std::fs::File;
+
+pub fn file_exists(path: &str) -> bool {
+    Path::new(path).exists()
+}
+
+pub fn read_file(path: &str) -> Result<Vec<u8>, String> {
+    let mut file = File::open(Path::new(path))
+        .map_err(|e| format!("Error opening file: {}", e))?;
+
+    let mut contents: Vec<u8> = Vec::new();
+
+    file.read_to_end(&mut contents)
+        .map_err(|e| format!("Error reading file: {}", e))?;
+
+    Ok(contents)
+}
+
+
+///
+/// String util methods
+///
+
+use std::str::FromStr;
+
+pub fn upcase_first(s: &str) -> String {
+    let mut c = s.chars();
+    match c.next() {
+        None => String::new(),
+        Some(f) => f.to_uppercase().collect::<String>() + c.as_str(),
+    }
+}
+
+pub fn parse_option_string<S, T>(string: Option<S>) -> Option<T> where S: Into<String>, T: FromStr {
+    if let Some(Ok(value)) = string.map(|s| s.into().parse::<T>()) {
+        Some(value)
+    } else {
+        None
+    }
+}
+
+///
+/// Date util methods
+///
+
+use chrono::NaiveDateTime;
+
+const DATETIME_FORMAT: &'static str = "%Y-%m-%dT%H:%M:%S%.6fZ";
+
+pub fn format_date(date: &NaiveDateTime) -> String {
+    date.format(DATETIME_FORMAT).to_string()
+}