1 files changed, 201 insertions, 0 deletions
diff --git a/cli/args/flags_allow_net.rs b/cli/args/flags_allow_net.rs
new file mode 100644
index 000000000..613ce04fe
--- /dev/null
+++ b/cli/args/flags_allow_net.rs
@@ -0,0 +1,201 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::url::Url;
+use std::net::IpAddr;
+use std::str::FromStr;
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct ParsePortError(String);
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct BarePort(u16);
+
+impl FromStr for BarePort {
+  type Err = ParsePortError;
+  fn from_str(s: &str) -> Result<BarePort, ParsePortError> {
+    if s.starts_with(':') {
+      match s.split_at(1).1.parse::<u16>() {
+        Ok(port) => Ok(BarePort(port)),
+        Err(e) => Err(ParsePortError(e.to_string())),
+      }
+    } else {
+      Err(ParsePortError(
+        "Bare Port doesn't start with ':'".to_string(),
+      ))
+    }
+  }
+}
+
+pub fn validator(host_and_port: &str) -> Result<(), String> {
+  if Url::parse(&format!("deno://{}", host_and_port)).is_ok()
+    || host_and_port.parse::<IpAddr>().is_ok()
+    || host_and_port.parse::<BarePort>().is_ok()
+  {
+    Ok(())
+  } else {
+    Err(format!("Bad host:port pair: {}", host_and_port))
+  }
+}
+
+/// Expands "bare port" paths (eg. ":8080") into full paths with hosts. It
+/// expands to such paths into 3 paths with following hosts: `0.0.0.0:port`,
+/// `127.0.0.1:port` and `localhost:port`.
+pub fn parse(paths: Vec<String>) -> clap::Result<Vec<String>> {
+  let mut out: Vec<String> = vec![];
+  for host_and_port in paths.iter() {
+    if Url::parse(&format!("deno://{}", host_and_port)).is_ok()
+      || host_and_port.parse::<IpAddr>().is_ok()
+    {
+      out.push(host_and_port.to_owned())
+    } else if let Ok(port) = host_and_port.parse::<BarePort>() {
+      // we got bare port, let's add default hosts
+      for host in ["0.0.0.0", "127.0.0.1", "localhost"].iter() {
+        out.push(format!("{}:{}", host, port.0));
+      }
+    } else {
+      return Err(clap::Error::raw(
+        clap::ErrorKind::InvalidValue,
+        format!("Bad host:port pair: {}", host_and_port),
+      ));
+    }
+  }
+  Ok(out)
+}
+
+#[cfg(test)]
+mod bare_port_tests {
+  use super::{BarePort, ParsePortError};
+
+  #[test]
+  fn bare_port_parsed() {
+    let expected = BarePort(8080);
+    let actual = ":8080".parse::<BarePort>();
+    assert_eq!(actual, Ok(expected));
+  }
+
+  #[test]
+  fn bare_port_parse_error1() {
+    let expected =
+      ParsePortError("Bare Port doesn't start with ':'".to_string());
+    let actual = "8080".parse::<BarePort>();
+    assert_eq!(actual, Err(expected));
+  }
+
+  #[test]
+  fn bare_port_parse_error2() {
+    let actual = ":65536".parse::<BarePort>();
+    assert!(actual.is_err());
+  }
+
+  #[test]
+  fn bare_port_parse_error3() {
+    let actual = ":14u16".parse::<BarePort>();
+    assert!(actual.is_err());
+  }
+
+  #[test]
+  fn bare_port_parse_error4() {
+    let actual = "Deno".parse::<BarePort>();
+    assert!(actual.is_err());
+  }
+
+  #[test]
+  fn bare_port_parse_error5() {
+    let actual = "deno.land:8080".parse::<BarePort>();
+    assert!(actual.is_err());
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::parse;
+
+  // Creates vector of strings, Vec<String>
+  macro_rules! svec {
+      ($($x:expr),*) => (vec![$($x.to_string()),*]);
+  }
+
+  #[test]
+  fn parse_net_args_() {
+    let entries = svec![
+      "deno.land",
+      "deno.land:80",
+      "::",
+      "::1",
+      "127.0.0.1",
+      "[::1]",
+      "1.2.3.4:5678",
+      "0.0.0.0:5678",
+      "127.0.0.1:5678",
+      "[::]:5678",
+      "[::1]:5678",
+      "localhost:5678",
+      "[::1]:8080",
+      "[::]:8000",
+      "[::1]:8000",
+      "localhost:8000",
+      "0.0.0.0:4545",
+      "127.0.0.1:4545",
+      "999.0.88.1:80"
+    ];
+    let expected = svec![
+      "deno.land",
+      "deno.land:80",
+      "::",
+      "::1",
+      "127.0.0.1",
+      "[::1]",
+      "1.2.3.4:5678",
+      "0.0.0.0:5678",
+      "127.0.0.1:5678",
+      "[::]:5678",
+      "[::1]:5678",
+      "localhost:5678",
+      "[::1]:8080",
+      "[::]:8000",
+      "[::1]:8000",
+      "localhost:8000",
+      "0.0.0.0:4545",
+      "127.0.0.1:4545",
+      "999.0.88.1:80"
+    ];
+    let actual = parse(entries).unwrap();
+    assert_eq!(actual, expected);
+  }
+
+  #[test]
+  fn parse_net_args_expansion() {
+    let entries = svec![":8080"];
+    let expected = svec!["0.0.0.0:8080", "127.0.0.1:8080", "localhost:8080"];
+    let actual = parse(entries).unwrap();
+    assert_eq!(actual, expected);
+  }
+
+  #[test]
+  fn parse_net_args_ipv6() {
+    let entries =
+      svec!["::", "::1", "[::1]", "[::]:5678", "[::1]:5678", "::cafe"];
+    let expected =
+      svec!["::", "::1", "[::1]", "[::]:5678", "[::1]:5678", "::cafe"];
+    let actual = parse(entries).unwrap();
+    assert_eq!(actual, expected);
+  }
+
+  #[test]
+  fn parse_net_args_ipv6_error1() {
+    let entries = svec![":::"];
+    assert!(parse(entries).is_err());
+  }
+
+  #[test]
+  fn parse_net_args_ipv6_error2() {
+    let entries = svec!["0123:4567:890a:bcde:fg::"];
+    assert!(parse(entries).is_err());
+  }
+
+  #[test]
+  fn parse_net_args_ipv6_error3() {
+    let entries = svec!["[::q]:8080"];
+    assert!(parse(entries).is_err());
+  }
+}