[pve-devel] [PATCH proxmox-firewall 05/37] config: firewall: add types for aliases

[Stefan Hanreich <s.hanreich@proxmox.com>]

Co-authored-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Signed-off-by: Stefan Hanreich <s.hanreich@proxmox.com>
---
 proxmox-ve-config/src/firewall/parse.rs       |  44 +++++
 proxmox-ve-config/src/firewall/types/alias.rs | 160 ++++++++++++++++++
 proxmox-ve-config/src/firewall/types/mod.rs   |   2 +
 3 files changed, 206 insertions(+)
 create mode 100644 proxmox-ve-config/src/firewall/types/alias.rs

diff --git a/proxmox-ve-config/src/firewall/parse.rs b/proxmox-ve-config/src/firewall/parse.rs
index a75daee..8e30006 100644
--- a/proxmox-ve-config/src/firewall/parse.rs
+++ b/proxmox-ve-config/src/firewall/parse.rs
@@ -1,5 +1,49 @@
 use anyhow::{bail, format_err, Error};
 
+/// Parses out a "name" which can be alphanumeric and include dashes.
+///
+/// Returns `None` if the name part would be empty.
+///
+/// Returns a tuple with the name and the remainder (not trimmed).
+pub fn match_name(line: &str) -> Option<(&str, &str)> {
+    let end = line
+        .as_bytes()
+        .iter()
+        .position(|&b| !(b.is_ascii_alphanumeric() || b == b'-'));
+
+    let (name, rest) = match end {
+        Some(end) => line.split_at(end),
+        None => (line, ""),
+    };
+
+    if name.is_empty() {
+        None
+    } else {
+        Some((name, rest))
+    }
+}
+
+/// Parses up to the next whitespace character or end of the string.
+///
+/// Returns `None` if the non-whitespace part would be empty.
+///
+/// Returns a tuple containing the parsed section and the *trimmed* remainder.
+pub fn match_non_whitespace(line: &str) -> Option<(&str, &str)> {
+    let (text, rest) = line
+        .as_bytes()
+        .iter()
+        .position(|&b| b.is_ascii_whitespace())
+        .map(|pos| {
+            let (a, b) = line.split_at(pos);
+            (a, b.trim_start())
+        })
+        .unwrap_or((line, ""));
+    if text.is_empty() {
+        None
+    } else {
+        Some((text, rest))
+    }
+}
 pub fn parse_bool(value: &str) -> Result<bool, Error> {
     Ok(
         if value == "0"
diff --git a/proxmox-ve-config/src/firewall/types/alias.rs b/proxmox-ve-config/src/firewall/types/alias.rs
new file mode 100644
index 0000000..43c6486
--- /dev/null
+++ b/proxmox-ve-config/src/firewall/types/alias.rs
@@ -0,0 +1,160 @@
+use std::fmt::Display;
+use std::str::FromStr;
+
+use anyhow::{bail, format_err, Error};
+use serde_with::DeserializeFromStr;
+
+use crate::firewall::parse::{match_name, match_non_whitespace};
+use crate::firewall::types::address::Cidr;
+
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(Eq, PartialEq))]
+pub enum AliasScope {
+    Datacenter,
+    Guest,
+}
+
+impl FromStr for AliasScope {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "dc" => AliasScope::Datacenter,
+            "guest" => AliasScope::Guest,
+            _ => bail!("invalid scope for alias: {s}"),
+        })
+    }
+}
+
+impl Display for AliasScope {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(match self {
+            AliasScope::Datacenter => "dc",
+            AliasScope::Guest => "guest",
+        })
+    }
+}
+
+#[derive(Debug, Clone, DeserializeFromStr)]
+#[cfg_attr(test, derive(Eq, PartialEq))]
+pub struct AliasName {
+    scope: AliasScope,
+    name: String,
+}
+
+impl Display for AliasName {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_fmt(format_args!("{}/{}", self.scope, self.name))
+    }
+}
+
+impl FromStr for AliasName {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.split_once('/') {
+            Some((prefix, name)) if !name.is_empty() => Ok(Self {
+                scope: prefix.parse()?,
+                name: name.to_string(),
+            }),
+            _ => {
+                bail!("Invalid Alias name!")
+            }
+        }
+    }
+}
+
+impl AliasName {
+    pub fn new(scope: AliasScope, name: impl Into<String>) -> Self {
+        Self {
+            scope,
+            name: name.into(),
+        }
+    }
+
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
+    pub fn scope(&self) -> &AliasScope {
+        &self.scope
+    }
+}
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(Eq, PartialEq))]
+pub struct Alias {
+    name: String,
+    address: Cidr,
+    comment: Option<String>,
+}
+
+impl Alias {
+    pub fn new(
+        name: impl Into<String>,
+        address: impl Into<Cidr>,
+        comment: impl Into<Option<String>>,
+    ) -> Self {
+        Self {
+            name: name.into(),
+            address: address.into(),
+            comment: comment.into(),
+        }
+    }
+
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
+    pub fn address(&self) -> &Cidr {
+        &self.address
+    }
+
+    pub fn comment(&self) -> Option<&str> {
+        self.comment.as_deref()
+    }
+}
+
+impl FromStr for Alias {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (name, line) =
+            match_name(s.trim_start()).ok_or_else(|| format_err!("expected an alias name"))?;
+
+        let (address, line) = match_non_whitespace(line.trim_start())
+            .ok_or_else(|| format_err!("expected a value for alias {name:?}"))?;
+
+        let address: Cidr = address.parse()?;
+
+        let line = line.trim_start();
+
+        let comment = match line.strip_prefix('#') {
+            Some(comment) => Some(comment.trim().to_string()),
+            None if !line.is_empty() => bail!("trailing characters in alias: {line:?}"),
+            None => None,
+        };
+
+        Ok(Alias {
+            name: name.to_string(),
+            address,
+            comment,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_alias_name() {
+        for name in ["dc/proxmox_123", "guest/proxmox-123"] {
+            name.parse::<AliasName>().expect("valid alias name");
+        }
+
+        for name in ["proxmox/proxmox_123", "guests/proxmox-123", "dc/", "/name"] {
+            name.parse::<AliasName>().expect_err("invalid alias name");
+        }
+    }
+}
diff --git a/proxmox-ve-config/src/firewall/types/mod.rs b/proxmox-ve-config/src/firewall/types/mod.rs
index 8bf31b8..69b69f4 100644
--- a/proxmox-ve-config/src/firewall/types/mod.rs
+++ b/proxmox-ve-config/src/firewall/types/mod.rs
@@ -1,5 +1,7 @@
 pub mod address;
+pub mod alias;
 pub mod log;
 pub mod port;
 
 pub use address::Cidr;
+pub use alias::Alias;
-- 
2.39.2