use garage_table::util::EmptyKey;
use garage_util::crdt::*;
use garage_util::data::*;
use garage_util::error::{Error as GarageError, OkOrMessage};
use garage_util::time::*;
use crate::bucket_alias_table::*;
use crate::bucket_table::*;
use crate::garage::Garage;
use crate::helper::error::*;
use crate::key_table::{Key, KeyFilter};
use crate::permission::BucketKeyPerm;
pub struct BucketHelper<'a>(pub(crate) &'a Garage);
#[allow(clippy::ptr_arg)]
impl<'a> BucketHelper<'a> {
pub async fn resolve_global_bucket_name(
&self,
bucket_name: &String,
) -> Result<Option<Uuid>, Error> {
// Bucket names in Garage are aliases, true bucket identifiers
// are 32-byte UUIDs. This function resolves bucket names into
// their full identifier by looking up in the bucket_alias_table.
// This function also allows buckets to be identified by their
// full UUID (hex-encoded). Here, if the name to be resolved is a
// hex string of the correct length, it is directly parsed as a bucket
// identifier which is returned. There is no risk of this conflicting
// with an actual bucket name: bucket names are max 63 chars long by
// the AWS spec, and hex-encoded UUIDs are 64 chars long.
let hexbucket = hex::decode(bucket_name.as_str())
.ok()
.map(|by| Uuid::try_from(&by))
.flatten();
if let Some(bucket_id) = hexbucket {
Ok(self
.0
.bucket_table
.get(&bucket_id, &EmptyKey)
.await?
.filter(|x| !x.state.is_deleted())
.map(|_| bucket_id))
} else {
Ok(self
.0
.bucket_alias_table
.get(&EmptyKey, bucket_name)
.await?
.map(|x| x.state.get().as_option().map(|x| x.bucket_id))
.flatten())
}
}
/// Returns a Bucket if it is present in bucket table,
/// even if it is in deleted state. Querying a non-existing
/// bucket ID returns an internal error.
pub async fn get_internal_bucket(&self, bucket_id: Uuid) -> Result<Bucket, Error> {
Ok(self
.0
.bucket_table
.get(&bucket_id, &EmptyKey)
.await?
.ok_or_message(format!("Bucket {:?} does not exist", bucket_id))?)
}
/// Returns a Bucket if it is present in bucket table,
/// only if it is in non-deleted state.
/// Querying a non-existing bucket ID or a deleted bucket
/// returns a bad request error.
pub async fn get_existing_bucket(&self, bucket_id: Uuid) -> Result<Bucket, Error> {
self.0
.bucket_table
.get(&bucket_id, &EmptyKey)
.await?
.filter(|b| !b.is_deleted())
.ok_or_bad_request(format!(
"Bucket {:?} does not exist or has been deleted",
bucket_id
))
}
/// Returns a Key if it is present in key table,
/// even if it is in deleted state. Querying a non-existing
/// key ID returns an internal error.
pub async fn get_internal_key(&self, key_id: &String) -> Result<Key, Error> {
Ok(self
.0
.key_table
.get(&EmptyKey, key_id)
.await?
.ok_or_message(format!("Key {} does not exist", key_id))?)
}
/// Returns a Key if it is present in key table,
/// only if it is in non-deleted state.
/// Querying a non-existing key ID or a deleted key
/// returns a bad request error.
pub async fn get_existing_key(&self, key_id: &String) -> Result<Key, Error> {
self.0
.key_table
.get(&EmptyKey, key_id)
.await?
.filter(|b| !b.state.is_deleted())
.ok_or_bad_request(format!("Key {} does not exist or has been deleted", key_id))
}
/// Returns a Key if it is present in key table,
/// looking it up by key ID or by a match on its name,
/// only if it is in non-deleted state.
/// Querying a non-existing key ID or a deleted key
/// returns a bad request error.
pub async fn get_existing_matching_key(&self, pattern: &str) -> Result<Key, Error> {
let candidates = self
.0
.key_table
.get_range(
&EmptyKey,
None,
Some(KeyFilter::MatchesAndNotDeleted(pattern.to_string())),
10,
)
.await?
.into_iter()
.collect::<Vec<_>>();
if candidates.len() != 1 {
Err(Error::BadRequest(format!(
"{} matching keys",
candidates.len()
)))
} else {
Ok(candidates.into_iter().next().unwrap())
}
}
/// Sets a new alias for a bucket in global namespace.
/// This function fails if:
/// - alias name is not valid according to S3 spec
/// - bucket does not exist or is deleted
/// - alias already exists and points to another bucket
pub async fn set_global_bucket_alias(
&self,
bucket_id: Uuid,
alias_name: &String,
) -> Result<(), Error> {
if !is_valid_bucket_name(alias_name) {
return Err(Error::BadRequest(format!(
"{}: {}",
alias_name, INVALID_BUCKET_NAME_MESSAGE
)));
}
let mut bucket = self.get_existing_bucket(bucket_id).await?;
let alias = self.0.bucket_alias_table.get(&EmptyKey, alias_name).await?;
if let Some(existing_alias) = alias.as_ref() {
if let Some(p) = existing_alias.state.get().as_option() {
if p.bucket_id != bucket_id {
return Err(Error::BadRequest(format!(
"Alias {} already exists and points to different bucket: {:?}",
alias_name, p.bucket_id
)));
}
}
}
// Checks ok, add alias
let mut bucket_p = bucket.state.as_option_mut().unwrap();
let alias_ts = increment_logical_clock_2(
bucket_p.aliases.get_timestamp(alias_name),
alias.as_ref().map(|a| a.state.timestamp()).unwrap_or(0),
);
// ---- timestamp-ensured causality barrier ----
// writes are now done and all writes use timestamp alias_ts
let alias = match alias {
None => BucketAlias::new(alias_name.clone(), alias_ts, bucket_id)
.ok_or_bad_request(format!("{}: {}", alias_name, INVALID_BUCKET_NAME_MESSAGE))?,
Some(mut a) => {
a.state = Lww::raw(alias_ts, Deletable::present(AliasParams { bucket_id }));
a
}
};
self.0.bucket_alias_table.insert(&alias).await?;
bucket_p.aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, true);
self.0.bucket_table.insert(&bucket).await?;
Ok(())
}
/// Unsets an alias for a bucket in global namespace.
/// This function fails if:
/// - bucket does not exist or is deleted
/// - alias does not exist or maps to another bucket (-> internal error)
/// - bucket has no other aliases (global or local)
pub async fn unset_global_bucket_alias(
&self,
bucket_id: Uuid,
alias_name: &String,
) -> Result<(), Error> {
let mut bucket = self.get_existing_bucket(bucket_id).await?;
let mut bucket_state = bucket.state.as_option_mut().unwrap();
let mut alias = self
.0
.bucket_alias_table
.get(&EmptyKey, alias_name)
.await?
.filter(|a| {
a.state
.get()
.as_option()
.map(|x| x.bucket_id == bucket_id)
.unwrap_or(false)
})
.ok_or_message(format!(
"Internal error: alias not found or does not point to bucket {:?}",
bucket_id
))?;
let has_other_global_aliases = bucket_state
.aliases
.items()
.iter()
.any(|(name, _, active)| name != alias_name && *active);
let has_other_local_aliases = bucket_state
.local_aliases
.items()
.iter()
.any(|(_, _, active)| *active);
if !has_other_global_aliases && !has_other_local_aliases {
return Err(Error::BadRequest(format!("Bucket {} doesn't have other aliases, please delete it instead of just unaliasing.", alias_name)));
}
// Checks ok, remove alias
let alias_ts = increment_logical_clock_2(
alias.state.timestamp(),
bucket_state.aliases.get_timestamp(alias_name),
);
// ---- timestamp-ensured causality barrier ----
// writes are now done and all writes use timestamp alias_ts
alias.state = Lww::raw(alias_ts, Deletable::delete());
self.0.bucket_alias_table.insert(&alias).await?;
bucket_state.aliases = LwwMap::raw_item(alias_name.clone(), alias_ts, false);
self.0.bucket_table.insert(&bucket).await?;
Ok(())
}
/// Sets a new alias for a bucket in the local namespace of a key.
/// This function fails if:
/// - alias name is not valid according to S3 spec
/// - bucket does not exist or is deleted
/// - key does not exist or is deleted
/// - alias already exists and points to another bucket
pub async fn set_local_bucket_alias(
&self,
bucket_id: Uuid,
key_id: &String,
alias_name: &String,
) -> Result<(), Error> {
if !is_valid_bucket_name(alias_name) {
return Err(Error::BadRequest(format!(
"{}: {}",
alias_name, INVALID_BUCKET_NAME_MESSAGE
)));
}
let mut bucket = self.get_existing_bucket(bucket_id).await?;
let mut key = self.get_existing_key(key_id).await?;
let mut key_param = key.state.as_option_mut().unwrap();
if let Some(Deletable::Present(existing_alias)) = key_param.local_aliases.get(alias_name) {
if *existing_alias != bucket_id {
return Err(Error::BadRequest(format!("Alias {} already exists in namespace of key {} and points to different bucket: {:?}", alias_name, key.key_id, existing_alias)));
}
}
// Checks ok, add alias
let mut bucket_p = bucket.state.as_option_mut().unwrap();
let bucket_p_local_alias_key = (key.key_id.clone(), alias_name.clone());
// Calculate the timestamp to assign to this aliasing in the two local_aliases maps
// (the one from key to bucket, and the reverse one stored in the bucket iself)
// so that merges on both maps in case of a concurrent operation resolve
// to the same alias being set
let alias_ts = increment_logical_clock_2(
key_param.local_aliases.get_timestamp(alias_name),
bucket_p
.local_aliases
.get_timestamp(&bucket_p_local_alias_key),
);
// ---- timestamp-ensured causality barrier ----
// writes are now done and all writes use timestamp alias_ts
key_param.local_aliases =
LwwMap::raw_item(alias_name.clone(), alias_ts, Deletable::present(bucket_id));
self.0.key_table.insert(&key).await?;
bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, true);
self.0.bucket_table.insert(&bucket).await?;
Ok(())
}
/// Unsets an alias for a bucket in the local namespace of a key.
/// This function fails if:
/// - bucket does not exist or is deleted
/// - key does not exist or is deleted
/// - alias does not exist or maps to another bucket (-> internal error)
/// - bucket has no other aliases (global or local)
pub async fn unset_local_bucket_alias(
&self,
bucket_id: Uuid,
key_id: &String,
alias_name: &String,
) -> Result<(), Error> {
let mut bucket = self.get_existing_bucket(bucket_id).await?;
let mut key = self.get_existing_key(key_id).await?;
let mut bucket_p = bucket.state.as_option_mut().unwrap();
if key
.state
.as_option()
.unwrap()
.local_aliases
.get(alias_name)
.map(|x| x.as_option())
.flatten() != Some(&bucket_id)
{
return Err(GarageError::Message(format!(
"Bucket {:?} does not have alias {} in namespace of key {}",
bucket_id, alias_name, key_id
))
.into());
}
let has_other_global_aliases = bucket_p
.aliases
.items()
.iter()
.any(|(_, _, active)| *active);
let has_other_local_aliases = bucket_p
.local_aliases
.items()
.iter()
.any(|((k, n), _, active)| *k == key.key_id && n == alias_name && *active);
if !has_other_global_aliases && !has_other_local_aliases {
return Err(Error::BadRequest(format!("Bucket {} doesn't have other aliases, please delete it instead of just unaliasing.", alias_name)));
}
// Checks ok, remove alias
let mut key_param = key.state.as_option_mut().unwrap();
let bucket_p_local_alias_key = (key.key_id.clone(), alias_name.clone());
let alias_ts = increment_logical_clock_2(
key_param.local_aliases.get_timestamp(alias_name),
bucket_p
.local_aliases
.get_timestamp(&bucket_p_local_alias_key),
);
// ---- timestamp-ensured causality barrier ----
// writes are now done and all writes use timestamp alias_ts
key_param.local_aliases =
LwwMap::raw_item(alias_name.clone(), alias_ts, Deletable::delete());
self.0.key_table.insert(&key).await?;
bucket_p.local_aliases = LwwMap::raw_item(bucket_p_local_alias_key, alias_ts, false);
self.0.bucket_table.insert(&bucket).await?;
Ok(())
}
/// Sets permissions for a key on a bucket.
/// This function fails if:
/// - bucket or key cannot be found at all (its ok if they are in deleted state)
/// - bucket or key is in deleted state and we are trying to set permissions other than "deny
/// all"
pub async fn set_bucket_key_permissions(
&self,
bucket_id: Uuid,
key_id: &String,
mut perm: BucketKeyPerm,
) -> Result<(), Error> {
let mut bucket = self.get_internal_bucket(bucket_id).await?;
let mut key = self.get_internal_key(key_id).await?;
let allow_any = perm.allow_read || perm.allow_write || perm.allow_owner;
if let Some(bstate) = bucket.state.as_option() {
if let Some(kp) = bstate.authorized_keys.get(key_id) {
perm.timestamp = increment_logical_clock_2(perm.timestamp, kp.timestamp);
}
} else if allow_any {
return Err(Error::BadRequest(
"Trying to give permissions on a deleted bucket".into(),
));
}
if let Some(kstate) = key.state.as_option() {
if let Some(bp) = kstate.authorized_buckets.get(&bucket_id) {
perm.timestamp = increment_logical_clock_2(perm.timestamp, bp.timestamp);
}
} else if allow_any {
return Err(Error::BadRequest(
"Trying to give permissions to a deleted key".into(),
));
}
// ---- timestamp-ensured causality barrier ----
if let Some(bstate) = bucket.state.as_option_mut() {
bstate.authorized_keys = Map::put_mutator(key_id.clone(), perm);
self.0.bucket_table.insert(&bucket).await?;
}
if let Some(kstate) = key.state.as_option_mut() {
kstate.authorized_buckets = Map::put_mutator(bucket_id, perm);
self.0.key_table.insert(&key).await?;
}
Ok(())
}
}
