1 files changed, 69 insertions, 1 deletions
diff --git a/src/main.rs b/src/main.rs
index 04140ed..b3fb3f3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,9 +2,40 @@
 
 //! Reads OTP configuration from a QR code and writes it to an OTP slot on a Nitrokey device.
 
+use std::fmt;
+use std::fs;
+use std::io;
+use std::path;
 use std::process;
 
 #[derive(Debug)]
+enum Error {
+    IoError(io::Error),
+    Error(String),
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            Error::IoError(ref err) => write!(f, "IO error: {}", err),
+            Error::Error(ref string) => write!(f, "Error: {}", string),
+        }
+    }
+}
+
+impl From<&str> for Error {
+    fn from(string: &str) -> Error {
+        Error::Error(string.to_string())
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(error: io::Error) -> Error {
+        Error::IoError(error)
+    }
+}
+
+#[derive(Debug)]
 struct Options {
     slot: u8,
     file: Option<String>,
@@ -41,9 +72,46 @@ fn parse_options() -> Result<Options, i32> {
     Ok(options)
 }
 
+fn import_qr_code() -> Result<path::PathBuf, Error> {
+    let mut temp = mktemp::Temp::new_file()?;
+    let path = temp.to_path_buf();
+
+    let status = process::Command::new("import").arg(&path).status()?;
+
+    if status.success() {
+        temp.release();
+        Ok(path)
+    } else {
+        match status.code() {
+            Some(code) => Err(Error::Error(format!(
+                "import failed with error code {}",
+                code
+            ))),
+            None => Err(Error::from("import was terminated by a signal")),
+        }
+    }
+}
+
+fn run(options: Options) -> Result<(), Error> {
+    let path = match options.file {
+        Some(ref file) => path::PathBuf::from(file),
+        None => import_qr_code()?,
+    };
+    if options.file.is_none() {
+        fs::remove_file(&path)?;
+    }
+    Ok(())
+}
+
 fn main() {
     let status = match parse_options() {
-        Ok(_) => 0,
+        Ok(options) => match run(options) {
+            Ok(()) => 0,
+            Err(err) => {
+                println!("{}", err);
+                1
+            }
+        },
         Err(err) => err,
     };
     process::exit(status);