use hyper::{Body, Request};
use idna::domain_to_unicode;
use serde::Deserialize;
use crate::common_error::{*, CommonError as Error};
/// What kind of authorization is required to perform a given action
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Authorization {
/// No authorization is required
None,
/// Having Read permission on bucket
Read,
/// Having Write permission on bucket
Write,
/// Having Owner permission on bucket
Owner,
}
/// Host to bucket
///
/// Convert a host, like "bucket.garage-site.tld" to the corresponding bucket "bucket",
/// considering that ".garage-site.tld" is the "root domain". For domains not matching
/// the provided root domain, no bucket is returned
/// This behavior has been chosen to follow AWS S3 semantic.
pub fn host_to_bucket<'a>(host: &'a str, root: &str) -> Option<&'a str> {
let root = root.trim_start_matches('.');
let label_root = root.chars().filter(|c| c == &'.').count() + 1;
let root = root.rsplit('.');
let mut host = host.rsplitn(label_root + 1, '.');
for root_part in root {
let host_part = host.next()?;
if root_part != host_part {
return None;
}
}
host.next()
}
/// Extract host from the authority section given by the HTTP host header
///
/// The HTTP host contains both a host and a port.
/// Extracting the port is more complex than just finding the colon (:) symbol due to IPv6
/// We do not use the collect pattern as there is no way in std rust to collect over a stack allocated value
/// check here: <https://docs.rs/collect_slice/1.2.0/collect_slice/>
pub fn authority_to_host(authority: &str) -> Result<String, Error> {
let mut iter = authority.chars().enumerate();
let (_, first_char) = iter
.next()
.ok_or_else(|| Error::bad_request("Authority is empty".to_string()))?;
let split = match first_char {
'[' => {
let mut iter = iter.skip_while(|(_, c)| c != &']');
match iter.next() {
Some((_, ']')) => iter.next(),
_ => {
return Err(Error::bad_request(format!(
"Authority {} has an illegal format",
authority
)))
}
}
}
_ => iter.find(|(_, c)| *c == ':'),
};
let authority = match split {
Some((i, ':')) => Ok(&authority[..i]),
None => Ok(authority),
Some((_, _)) => Err(Error::bad_request(format!(
"Authority {} has an illegal format",
authority
))),
};
authority.map(|h| domain_to_unicode(h).0)
}
/// Extract the bucket name and the key name from an HTTP path and possibly a bucket provided in
/// the host header of the request
///
/// S3 internally manages only buckets and keys. This function splits
/// an HTTP path to get the corresponding bucket name and key.
pub fn parse_bucket_key<'a>(
path: &'a str,
host_bucket: Option<&'a str>,
) -> Result<(&'a str, Option<&'a str>), Error> {
let path = path.trim_start_matches('/');
if let Some(bucket) = host_bucket {
if !path.is_empty() {
return Ok((bucket, Some(path)));
} else {
return Ok((bucket, None));
}
}
let (bucket, key) = match path.find('/') {
Some(i) => {
let key = &path[i + 1..];
if !key.is_empty() {
(&path[..i], Some(key))
} else {
(&path[..i], None)
}
}
None => (path, None),
};
if bucket.is_empty() {
return Err(Error::bad_request("No bucket specified"));
}
Ok((bucket, key))
}
const UTF8_BEFORE_LAST_CHAR: char = '\u{10FFFE}';
/// Compute the key after the prefix
pub fn key_after_prefix(pfx: &str) -> Option<String> {
let mut next = pfx.to_string();
while !next.is_empty() {
let tail = next.pop().unwrap();
if tail >= char::MAX {
continue;
}
// Circumvent a limitation of RangeFrom that overflow earlier than needed
// See: https://doc.rust-lang.org/core/ops/struct.RangeFrom.html
let new_tail = if tail == UTF8_BEFORE_LAST_CHAR {
char::MAX
} else {
(tail..).nth(1).unwrap()
};
next.push(new_tail);
return Some(next);
}
None
}
pub async fn parse_json_body<T: for<'de> Deserialize<'de>>(req: Request<Body>) -> Result<T, Error> {
let body = hyper::body::to_bytes(req.into_body()).await?;
let resp: T = serde_json::from_slice(&body).ok_or_bad_request("Invalid JSON")?;
Ok(resp)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_bucket_containing_a_key() -> Result<(), Error> {
let (bucket, key) = parse_bucket_key("/my_bucket/a/super/file.jpg", None)?;
assert_eq!(bucket, "my_bucket");
assert_eq!(key.expect("key must be set"), "a/super/file.jpg");
Ok(())
}
#[test]
fn parse_bucket_containing_no_key() -> Result<(), Error> {
let (bucket, key) = parse_bucket_key("/my_bucket/", None)?;
assert_eq!(bucket, "my_bucket");
assert!(key.is_none());
let (bucket, key) = parse_bucket_key("/my_bucket", None)?;
assert_eq!(bucket, "my_bucket");
assert!(key.is_none());
Ok(())
}
#[test]
fn parse_bucket_containing_no_bucket() {
let parsed = parse_bucket_key("", None);
assert!(parsed.is_err());
let parsed = parse_bucket_key("/", None);
assert!(parsed.is_err());
let parsed = parse_bucket_key("////", None);
assert!(parsed.is_err());
}
#[test]
fn parse_bucket_with_vhost_and_key() -> Result<(), Error> {
let (bucket, key) = parse_bucket_key("/a/super/file.jpg", Some("my-bucket"))?;
assert_eq!(bucket, "my-bucket");
assert_eq!(key.expect("key must be set"), "a/super/file.jpg");
Ok(())
}
#[test]
fn parse_bucket_with_vhost_no_key() -> Result<(), Error> {
let (bucket, key) = parse_bucket_key("", Some("my-bucket"))?;
assert_eq!(bucket, "my-bucket");
assert!(key.is_none());
let (bucket, key) = parse_bucket_key("/", Some("my-bucket"))?;
assert_eq!(bucket, "my-bucket");
assert!(key.is_none());
Ok(())
}
#[test]
fn authority_to_host_with_port() -> Result<(), Error> {
let domain = authority_to_host("[::1]:3902")?;
assert_eq!(domain, "[::1]");
let domain2 = authority_to_host("garage.tld:65200")?;
assert_eq!(domain2, "garage.tld");
let domain3 = authority_to_host("127.0.0.1:80")?;
assert_eq!(domain3, "127.0.0.1");
Ok(())
}
#[test]
fn authority_to_host_without_port() -> Result<(), Error> {
let domain = authority_to_host("[::1]")?;
assert_eq!(domain, "[::1]");
let domain2 = authority_to_host("garage.tld")?;
assert_eq!(domain2, "garage.tld");
let domain3 = authority_to_host("127.0.0.1")?;
assert_eq!(domain3, "127.0.0.1");
assert!(authority_to_host("[").is_err());
assert!(authority_to_host("[hello").is_err());
Ok(())
}
#[test]
fn host_to_bucket_test() {
assert_eq!(
host_to_bucket("john.doe.garage.tld", ".garage.tld").unwrap(),
"john.doe"
);
assert_eq!(
host_to_bucket("john.doe.garage.tld", "garage.tld").unwrap(),
"john.doe"
);
assert_eq!(host_to_bucket("john.doe.com", "garage.tld"), None);
assert_eq!(host_to_bucket("john.doe.com", ".garage.tld"), None);
assert_eq!(host_to_bucket("garage.tld", "garage.tld"), None);
assert_eq!(host_to_bucket("garage.tld", ".garage.tld"), None);
assert_eq!(host_to_bucket("not-garage.tld", "garage.tld"), None);
assert_eq!(host_to_bucket("not-garage.tld", ".garage.tld"), None);
}
#[test]
fn test_key_after_prefix() {
use std::iter::FromIterator;
assert_eq!(UTF8_BEFORE_LAST_CHAR as u32, (char::MAX as u32) - 1);
assert_eq!(key_after_prefix("a/b/").unwrap().as_str(), "a/b0");
assert_eq!(key_after_prefix("€").unwrap().as_str(), "₭");
assert_eq!(
key_after_prefix("").unwrap().as_str(),
String::from(char::from_u32(0x10FFFE).unwrap())
);
// When the last character is the biggest UTF8 char
let a = String::from_iter(['a', char::MAX].iter());
assert_eq!(key_after_prefix(a.as_str()).unwrap().as_str(), "b");
// When all characters are the biggest UTF8 char
let b = String::from_iter([char::MAX; 3].iter());
assert!(key_after_prefix(b.as_str()).is_none());
// Check utf8 surrogates
let c = String::from('\u{D7FF}');
assert_eq!(
key_after_prefix(c.as_str()).unwrap().as_str(),
String::from('\u{E000}')
);
// Check the character before the biggest one
let d = String::from('\u{10FFFE}');
assert_eq!(
key_after_prefix(d.as_str()).unwrap().as_str(),
String::from(char::MAX)
);
}
}
