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use std::{borrow::Cow, collections::BTreeMap, convert::TryFrom};
use crate::bstr::{BStr, BString, ByteSlice};
pub mod init {
use crate::bstr::BString;
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("{value:?} must be allow|deny|user in configuration key protocol{0}.allow", scheme.as_ref().map(|s| format!(".{}", s)).unwrap_or_default())]
InvalidConfiguration { scheme: Option<String>, value: BString },
}
}
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
enum Allow {
Always,
Never,
User,
}
impl Allow {
pub fn to_bool(self, user_allowed: Option<bool>) -> bool {
match self {
Allow::Always => true,
Allow::Never => false,
Allow::User => user_allowed.unwrap_or(true),
}
}
}
impl<'a> TryFrom<Cow<'a, BStr>> for Allow {
type Error = BString;
fn try_from(v: Cow<'a, BStr>) -> Result<Self, Self::Error> {
Ok(match v.as_ref().as_ref() {
b"never" => Allow::Never,
b"always" => Allow::Always,
b"user" => Allow::User,
unknown => return Err(unknown.into()),
})
}
}
#[derive(Debug, Clone)]
pub(crate) struct SchemePermission {
user_allowed: Option<bool>,
allow: Option<Allow>,
allow_per_scheme: BTreeMap<git_url::Scheme, Allow>,
}
impl SchemePermission {
pub fn from_config(
config: &git_config::File<'static>,
git_prefix: git_sec::Permission,
mut filter: fn(&git_config::file::Metadata) -> bool,
) -> Result<Self, init::Error> {
let allow: Option<Allow> = config
.string_filter("protocol", None, "allow", &mut filter)
.map(Allow::try_from)
.transpose()
.map_err(|invalid| init::Error::InvalidConfiguration {
value: invalid,
scheme: None,
})?;
let mut saw_user = allow.map_or(false, |allow| allow == Allow::User);
let allow_per_scheme = match config.sections_by_name_and_filter("protocol", &mut filter) {
Some(it) => {
let mut map = BTreeMap::default();
for (section, scheme) in it.filter_map(|section| {
section.header().subsection_name().and_then(|scheme| {
scheme
.to_str()
.ok()
.and_then(|scheme| git_url::Scheme::try_from(scheme).ok().map(|scheme| (section, scheme)))
})
}) {
if let Some(value) = section
.value("allow")
.map(Allow::try_from)
.transpose()
.map_err(|invalid| init::Error::InvalidConfiguration {
scheme: Some(scheme.as_str().into()),
value: invalid,
})?
{
saw_user |= value == Allow::User;
map.insert(scheme, value);
}
}
map
}
None => Default::default(),
};
let user_allowed = saw_user.then(|| {
std::env::var_os("GIT_PROTOCOL_FROM_USER")
.and_then(|val| git_prefix.check_opt(val))
.map_or(true, |val| val == "1")
});
Ok(SchemePermission {
allow,
allow_per_scheme,
user_allowed,
})
}
}
impl SchemePermission {
pub fn allow(&self, scheme: &git_url::Scheme) -> bool {
self.allow_per_scheme.get(scheme).or(self.allow.as_ref()).map_or_else(
|| {
use git_url::Scheme::*;
match scheme {
File | Git | Ssh | Http | Https => true,
Ext(_) => false,
}
},
|allow| allow.to_bool(self.user_allowed),
)
}
}