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use std::collections::HashSet;
use std::str::FromStr;
use anyhow::{anyhow, Result};
use aws_sdk_route53 as route53;
use aws_sdk_route53::types::{HostedZone, ResourceRecord, RrType};
// Needed until try_collect is stable, see <https://github.com/rust-lang/rust/issues/94047>
use itertools::Itertools;
use trust_dns_proto::rr::Name;
use crate::dns;
pub trait Route53 {
fn route53(&self) -> &route53::Client;
}
pub async fn zone_for_name<C>(aws_context: &C, name: &Name) -> Result<HostedZone>
where
C: Route53,
{
let names = dns::suffixes(name.clone());
let mut zone = None;
let mut depth = None;
let mut zones = aws_context
.route53()
.list_hosted_zones()
.into_paginator()
.items()
.send();
while let Some(candidate_zone) = zones.try_next().await? {
let zone_name = Name::from_str(candidate_zone.name())?;
let match_position = names.iter().position(|name| *name == zone_name);
match (depth, match_position) {
(None, Some(matched_depth)) => {
zone = Some(candidate_zone.clone());
depth = Some(matched_depth);
}
(Some(found_depth), Some(matched_depth)) => {
if matched_depth < found_depth {
zone = Some(candidate_zone.clone());
depth = Some(matched_depth);
}
}
(_, _) => {}
}
}
zone.ok_or(anyhow!("No Route53 zone found for DNS suffix: {}", name))
}
pub async fn zone_actual_recordsets<C>(
aws_context: &C,
zone_id: &str,
dns_name: &Name,
) -> Result<HashSet<ResourceRecordSet>>
where
C: Route53,
{
let mut suffix_records = HashSet::new();
let mut next_record_name = Some(dns_name.to_ascii());
let mut next_record_type = None;
let mut next_record_identifier = None;
loop {
let records_resp = aws_context
.route53()
.list_resource_record_sets()
.hosted_zone_id(zone_id)
.set_start_record_name(next_record_name)
.set_start_record_type(next_record_type)
.set_start_record_identifier(next_record_identifier)
.send()
.await?;
let recordsets = records_resp.resource_record_sets();
for recordset in recordsets {
let recordset_name = recordset.name();
let recordset_name = Name::from_str(recordset_name)?;
if &recordset_name != dns_name {
break;
}
if [RrType::A, RrType::Aaaa].contains(recordset.r#type()) {
suffix_records.insert(recordset.clone().into());
}
}
if records_resp.is_truncated() {
next_record_name = records_resp.next_record_name().map(String::from);
next_record_type = records_resp.next_record_type().cloned();
next_record_identifier = records_resp.next_record_identifier().map(String::from);
} else {
break;
}
}
Ok(suffix_records)
}
pub struct Target {
name: Name,
ttl: i64,
}
impl Target {
pub fn new(name: &Name, ttl: i64) -> Result<Self> {
let name = dns::absolute(name.to_owned())?;
Ok(Self { name, ttl })
}
pub fn name(&self) -> &Name {
&self.name
}
pub fn host_proposal(
&self,
rr_type: RrType,
addresses: HashSet<impl Into<String>>,
) -> Result<Option<ResourceRecordSet>> {
if addresses.is_empty() {
Ok(None)
} else {
let records = addresses
.into_iter()
.map(|address| address.into())
.map(|address| ResourceRecord::builder().value(address).build())
.try_collect()?;
let record_set = route53::types::ResourceRecordSet::builder()
.name(self.name().to_ascii())
.r#type(rr_type)
.ttl(self.ttl)
.set_resource_records(Some(records))
.build()?
.into();
Ok(Some(record_set))
}
}
}
// ResourceRecordSet isn't hashable (reasonably enough), but we're going to do set difference on them
// later to identify which records to remove, and which to keep. This wrapper type adds a trivial - but
// probably correct - implementation of Hash and Eq so that ResourceRecordSet instances can be stored
// in hash sets.
#[derive(Clone, Debug, PartialEq)]
pub struct ResourceRecordSet(route53::types::ResourceRecordSet);
// Equality is based on the observation that ResourceRecordSet already implements partialeq by derive,
// and that none of its fields have any actual partially-equal results. As a result, any two
// ResourceRecordSet instances that are fieldwise-equal are themselves equal under PartialEq. Promote
// this result to Eq.
impl Eq for ResourceRecordSet {}
// Hash ResourceRecordSet instances by name and address(es).
impl std::hash::Hash for ResourceRecordSet {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.0.name().hash(state);
self.0
.resource_records()
.iter()
.map(ResourceRecord::value)
.for_each(|val| val.hash(state));
}
}
impl From<route53::types::ResourceRecordSet> for ResourceRecordSet {
fn from(recordset: route53::types::ResourceRecordSet) -> Self {
Self(recordset)
}
}
impl From<ResourceRecordSet> for route53::types::ResourceRecordSet {
fn from(recordset: ResourceRecordSet) -> Self {
recordset.0
}
}
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