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use std::cmp::Ordering;
use regex::Regex;
use crate::{OBJECT_PATH_REGEX, Value, DecodeError};
/// An enum representing a [header field].
///
/// [header field]: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-header-fields
#[derive(Debug, Eq, Clone, PartialOrd, Ord)]
pub enum Header {
Path(String),
Interface(String),
Member(String),
ErrorName(String),
ReplySerial(u32),
Destination(String),
Sender(String),
Signature(String),
}
impl PartialEq for Header {
fn eq(&self, other: &Header) -> bool {
self.cmp(other) == Ordering::Equal
}
}
impl Header {
/// Parse a header field from a Value of the type `(yv)`.
pub fn from(v: Value) -> Result<Header, DecodeError> {
// The outer `Value` has to be a struct.
if let Value::Struct(mut values) = v {
// The length of the struct have to be 2
if values.len() == 2 {
// Check if the second is a Variant and unwrap the value.
let v = if let Value::Variant(mut v) = values.pop().unwrap() {
// The Variant should only contain one element.
if v.len() != 1 {
return Err(DecodeError::Header);
}
v.pop().unwrap()
} else {
return Err(DecodeError::Header);
};
// Check if the first is a byte
if let Value::Byte(b) = values.pop().unwrap() {
lazy_static! {
/// The regular expression for a valid [bus name].
///
/// [bus name]: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus
static ref BUS_NAMES: Regex = Regex::new(":?[A-Za-z0-9_-]+(.[A-Za-z0-9_-]+)+").unwrap();
}
match b {
1 => {
// The header field is a Path.
if let Value::ObjectPath(s) = v {
if OBJECT_PATH_REGEX.is_match(&s) {
Ok(Header::Path(s))
} else {
Err(DecodeError::ObjectPathRegex)
}
} else {
Err(DecodeError::Header)
}
},
2 => {
// The header field is an Interface.
if let Value::String(s) = v {
lazy_static! {
/// The regular expression for a valid
/// [interface name].
///
/// [bus name]: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-interface
static ref INTERFACE_REGEX: Regex = Regex::new("[A-Za-z0-9_]+(.[A-Za-z0-9_]+)+").unwrap();
}
if INTERFACE_REGEX.is_match(&s) {
Ok(Header::Interface(s))
} else {
Err(DecodeError::InterfaceRegex)
}
} else {
Err(DecodeError::Header)
}
},
3 => {
// The header field is an Interface.
if let Value::String(s) = v {
lazy_static! {
/// The regular expression for a valid
/// [member name].
///
/// [member name]: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-member
static ref MEMBER_REGEX: Regex = Regex::new("[A-Za-z_][A-Za-z0-9_]*").unwrap();
}
if MEMBER_REGEX.is_match(&s) {
Ok(Header::Member(s))
} else {
Err(DecodeError::MemberRegex)
}
} else {
Err(DecodeError::Header)
}
},
4 => {
// The header field is an ErrorName.
if let Value::String(s) = v {
Ok(Header::ErrorName(s))
} else {
Err(DecodeError::Header)
}
},
5 => {
// The header field is a ReplySerial.
if let Value::Uint32(u) = v {
Ok(Header::ReplySerial(u))
} else {
Err(DecodeError::Header)
}
},
6 => {
// The header field is a Destination.
if let Value::String(s) = v {
if BUS_NAMES.is_match(&s) {
Ok(Header::Destination(s))
} else {
Err(DecodeError::BusNamesRegex)
}
} else {
Err(DecodeError::Header)
}
},
7 => {
// The header field is a Sender.
if let Value::String(s) = v {
if BUS_NAMES.is_match(&s) {
Ok(Header::Sender(s))
} else {
Err(DecodeError::BusNamesRegex)
}
} else {
Err(DecodeError::Header)
}
},
8 => {
// The header field is a Signature.
if let Value::Signature(s) = v {
Ok(Header::Signature(s))
} else {
Err(DecodeError::Header)
}
},
_ => {
// Invalid number.
Err(DecodeError::Header)
}
}
} else {
Err(DecodeError::Header)
}
} else {
Err(DecodeError::Header)
}
} else {
Err(DecodeError::Header)
}
}
/// Convert a `Header` object to a `Value`.
pub fn into_value(self) -> Value {
let (b, v) = match self {
Header::Path(s) => {
(Value::Byte(1), Value::ObjectPath(s))
},
Header::Interface(s) => {
(Value::Byte(2), Value::String(s))
},
Header::Member(s) => {
(Value::Byte(3), Value::String(s))
},
Header::ErrorName(s) => {
(Value::Byte(4), Value::String(s))
},
Header::ReplySerial(u) => {
(Value::Byte(5), Value::Uint32(u))
},
Header::Destination(s) => {
(Value::Byte(6), Value::String(s))
},
Header::Sender(s) => {
(Value::Byte(7), Value::String(s))
},
Header::Signature(s) => {
(Value::Byte(8), Value::Signature(s))
},
};
Value::Struct(vec![b, Value::Variant(vec![v])])
}
}
#[cfg(test)]
use std::collections::BTreeSet;
#[test]
fn test_header_1() {
let b = Value::Byte(1);
let v = Value::Variant(vec![Value::ObjectPath("/".to_string())]);
let header = Header::from(Value::Struct(vec![b, v])).unwrap();
let mut tree = BTreeSet::new();
tree.insert(header);
let b = Value::Byte(1);
let v = Value::Variant(vec![Value::ObjectPath("/a/".to_string())]);
let header = Header::from(Value::Struct(vec![b, v])).unwrap();
let mut tree = BTreeSet::new();
tree.insert(header);
assert_eq!(tree.len(), 1);
}