use crate::{
CAARecord, DnsRecord, DnsRecordType, Error, IntoFqdn, KeyValue, MXRecord, SRVRecord,
http::{HttpClient, HttpClientBuilder},
utils::{strip_origin_from_name, txt_chunks_to_text},
};
use serde::{Deserialize, Serialize};
use std::{net::AddrParseError, time::Duration};
#[derive(Clone)]
pub struct HetznerProvider {
client: HttpClient,
endpoint: String,
}
#[derive(Serialize, Debug)]
struct RRSetCreate<'a> {
name: &'a str,
#[serde(rename = "type")]
record_type: &'a str,
ttl: u32,
records: Vec<RecordValue>,
}
#[derive(Serialize, Debug)]
struct SetRecordsBody {
records: Vec<RecordValue>,
}
#[derive(Serialize, Debug)]
struct AddRecordsBody {
records: Vec<RecordValue>,
ttl: u32,
}
#[derive(Serialize, Debug)]
struct RemoveRecordsBody {
records: Vec<RecordValue>,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
struct RecordValue {
value: String,
}
#[derive(Deserialize, Debug)]
#[allow(dead_code)]
struct ActionResponse {
#[serde(default)]
action: Option<serde_json::Value>,
#[serde(default)]
rrset: Option<serde_json::Value>,
}
#[derive(Deserialize, Debug)]
struct ListRRSetsResponse {
#[serde(default)]
rrsets: Vec<ListedRRSet>,
}
#[derive(Deserialize, Debug)]
struct ListedRRSet {
#[serde(rename = "type")]
record_type: String,
#[serde(default)]
records: Vec<RecordValue>,
}
const DEFAULT_API_ENDPOINT: &str = "https://api.hetzner.cloud/v1";
const RETRIES: u32 = 3;
impl HetznerProvider {
pub(crate) fn new(
api_token: impl AsRef<str>,
timeout: Option<Duration>,
) -> crate::Result<Self> {
let token = api_token.as_ref();
if token.is_empty() {
return Err(Error::Api(
"Hetzner API token must not be empty".to_string(),
));
}
let client = HttpClientBuilder::default()
.with_header("Authorization", format!("Bearer {token}"))
.with_timeout(timeout)
.build();
Ok(Self {
client,
endpoint: DEFAULT_API_ENDPOINT.to_string(),
})
}
#[cfg(test)]
pub(crate) fn with_endpoint(self, endpoint: impl AsRef<str>) -> Self {
Self {
endpoint: endpoint.as_ref().to_string(),
..self
}
}
pub(crate) async fn set_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
ttl: u32,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
reject_tlsa(record_type)?;
let name = name.into_name();
let domain = origin.into_name();
let subdomain = strip_origin_from_name(&name, &domain, Some("@"));
if records.is_empty() {
return self.delete_rrset(&domain, &subdomain, record_type).await;
}
let values = build_values(records)?;
let url = format!(
"{}/zones/{}/rrsets/{}/{}/actions/set_records",
self.endpoint,
domain,
subdomain,
record_type.as_str(),
);
match self
.client
.post(url)
.with_body(SetRecordsBody {
records: values.clone(),
})?
.send_with_retry::<ActionResponse>(RETRIES)
.await
{
Ok(_) => self.change_ttl(&domain, &subdomain, record_type, ttl).await,
Err(Error::NotFound) => {
self.create_rrset(&domain, &subdomain, record_type, ttl, values)
.await
}
Err(e) => Err(e),
}
}
pub(crate) async fn add_to_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
ttl: u32,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
reject_tlsa(record_type)?;
if records.is_empty() {
return Ok(());
}
let name = name.into_name();
let domain = origin.into_name();
let subdomain = strip_origin_from_name(&name, &domain, Some("@"));
let values = build_values(records)?;
let url = format!(
"{}/zones/{}/rrsets/{}/{}/actions/add_records",
self.endpoint,
domain,
subdomain,
record_type.as_str(),
);
match self
.client
.post(url)
.with_body(AddRecordsBody {
records: values.clone(),
ttl,
})?
.send_with_retry::<ActionResponse>(RETRIES)
.await
{
Ok(_) => Ok(()),
Err(Error::NotFound) => {
self.create_rrset(&domain, &subdomain, record_type, ttl, values)
.await
}
Err(e) => Err(e),
}
}
pub(crate) async fn remove_from_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
records: Vec<DnsRecord>,
origin: impl IntoFqdn<'_>,
) -> crate::Result<()> {
check_record_types(record_type, &records)?;
reject_tlsa(record_type)?;
if records.is_empty() {
return Ok(());
}
let name = name.into_name();
let domain = origin.into_name();
let subdomain = strip_origin_from_name(&name, &domain, Some("@"));
let values = build_values(records)?;
let url = format!(
"{}/zones/{}/rrsets/{}/{}/actions/remove_records",
self.endpoint,
domain,
subdomain,
record_type.as_str(),
);
match self
.client
.post(url)
.with_body(RemoveRecordsBody { records: values })?
.send_with_retry::<ActionResponse>(RETRIES)
.await
{
Ok(_) => Ok(()),
Err(Error::NotFound) => Ok(()),
Err(e) => Err(e),
}
}
pub(crate) async fn list_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
origin: impl IntoFqdn<'_>,
) -> crate::Result<Vec<DnsRecord>> {
let name = name.into_name();
let domain = origin.into_name();
let subdomain = strip_origin_from_name(&name, &domain, Some("@"));
let query = serde_urlencoded::to_string([
("name", subdomain.as_str()),
("type", record_type.as_str()),
("per_page", "50"),
])
.map_err(|e| Error::Serialize(e.to_string()))?;
let url = format!("{}/zones/{}/rrsets?{}", self.endpoint, domain, query);
let response: ListRRSetsResponse = match self.client.get(url).send_with_retry(RETRIES).await
{
Ok(r) => r,
Err(Error::NotFound) => return Ok(Vec::new()),
Err(e) => return Err(e),
};
let expected_type = record_type.as_str();
let mut out = Vec::new();
for rrset in response.rrsets {
if rrset.record_type != expected_type {
continue;
}
for r in rrset.records {
out.push(parse_value(record_type, &r.value)?);
}
}
Ok(out)
}
async fn create_rrset(
&self,
domain: &str,
subdomain: &str,
record_type: DnsRecordType,
ttl: u32,
values: Vec<RecordValue>,
) -> crate::Result<()> {
self.client
.post(format!("{}/zones/{}/rrsets", self.endpoint, domain))
.with_body(RRSetCreate {
name: subdomain,
record_type: record_type.as_str(),
ttl,
records: values,
})?
.send_with_retry::<ActionResponse>(RETRIES)
.await
.map(|_| ())
}
async fn delete_rrset(
&self,
domain: &str,
subdomain: &str,
record_type: DnsRecordType,
) -> crate::Result<()> {
match self
.client
.delete(format!(
"{}/zones/{}/rrsets/{}/{}",
self.endpoint,
domain,
subdomain,
record_type.as_str(),
))
.send_raw()
.await
{
Ok(_) => Ok(()),
Err(Error::NotFound) => Ok(()),
Err(e) => Err(e),
}
}
async fn change_ttl(
&self,
domain: &str,
subdomain: &str,
record_type: DnsRecordType,
ttl: u32,
) -> crate::Result<()> {
#[derive(Serialize)]
struct ChangeTtl {
ttl: u32,
}
let url = format!(
"{}/zones/{}/rrsets/{}/{}/actions/change_ttl",
self.endpoint,
domain,
subdomain,
record_type.as_str(),
);
self.client
.post(url)
.with_body(ChangeTtl { ttl })?
.send_with_retry::<ActionResponse>(RETRIES)
.await
.map(|_| ())
}
}
fn check_record_types(expected: DnsRecordType, records: &[DnsRecord]) -> crate::Result<()> {
for r in records {
if r.as_type() != expected {
return Err(Error::Api(format!(
"RRSet record type mismatch: expected {}, got {}",
expected.as_str(),
r.as_type().as_str(),
)));
}
}
Ok(())
}
fn reject_tlsa(record_type: DnsRecordType) -> crate::Result<()> {
if record_type == DnsRecordType::TLSA {
Err(Error::Unsupported(
"TLSA records are not supported by Hetzner".to_string(),
))
} else {
Ok(())
}
}
fn build_values(records: Vec<DnsRecord>) -> crate::Result<Vec<RecordValue>> {
let mut out = Vec::with_capacity(records.len());
for record in records {
out.push(RecordValue {
value: render_value(record)?,
});
}
Ok(out)
}
fn render_value(record: DnsRecord) -> crate::Result<String> {
Ok(match record {
DnsRecord::A(addr) => addr.to_string(),
DnsRecord::AAAA(addr) => addr.to_string(),
DnsRecord::CNAME(content) => ensure_trailing_dot(content),
DnsRecord::NS(content) => ensure_trailing_dot(content),
DnsRecord::MX(mx) => format!("{} {}", mx.priority, ensure_trailing_dot(mx.exchange)),
DnsRecord::TXT(content) => {
let mut out = String::with_capacity(content.len() + 4);
txt_chunks_to_text(&mut out, &content, " ");
out
}
DnsRecord::SRV(srv) => format!(
"{} {} {} {}",
srv.priority,
srv.weight,
srv.port,
ensure_trailing_dot(srv.target),
),
DnsRecord::TLSA(_) => {
return Err(Error::Unsupported(
"TLSA records are not supported by Hetzner".to_string(),
));
}
DnsRecord::CAA(caa) => caa.to_string(),
})
}
fn parse_value(record_type: DnsRecordType, value: &str) -> crate::Result<DnsRecord> {
Ok(match record_type {
DnsRecordType::A => DnsRecord::A(value.parse().map_err(|e: AddrParseError| {
Error::Parse(format!("invalid A value '{value}': {e}"))
})?),
DnsRecordType::AAAA => DnsRecord::AAAA(value.parse().map_err(|e: AddrParseError| {
Error::Parse(format!("invalid AAAA value '{value}': {e}"))
})?),
DnsRecordType::CNAME => DnsRecord::CNAME(strip_trailing_dot(value)),
DnsRecordType::NS => DnsRecord::NS(strip_trailing_dot(value)),
DnsRecordType::MX => parse_mx(value)?,
DnsRecordType::TXT => DnsRecord::TXT(parse_txt(value)),
DnsRecordType::SRV => parse_srv(value)?,
DnsRecordType::TLSA => {
return Err(Error::Unsupported(
"TLSA records are not supported by Hetzner".to_string(),
));
}
DnsRecordType::CAA => parse_caa(value)?,
})
}
fn parse_mx(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.splitn(2, char::is_whitespace);
let priority = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid MX value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid MX priority in '{value}': {e}")))?;
let exchange = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid MX value '{value}'")))?
.trim();
Ok(DnsRecord::MX(MXRecord {
priority,
exchange: strip_trailing_dot(exchange),
}))
}
fn parse_srv(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.split_whitespace();
let priority = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV priority in '{value}': {e}")))?;
let weight = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV weight in '{value}': {e}")))?;
let port = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid SRV port in '{value}': {e}")))?;
let target = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid SRV value '{value}'")))?;
Ok(DnsRecord::SRV(SRVRecord {
priority,
weight,
port,
target: strip_trailing_dot(target),
}))
}
fn parse_txt(value: &str) -> String {
let trimmed = value.trim();
let mut out = String::with_capacity(trimmed.len());
let mut bytes = trimmed.bytes().peekable();
while let Some(&b) = bytes.peek() {
if b != b'"' {
bytes.next();
continue;
}
bytes.next();
loop {
match bytes.next() {
Some(b'"') => break,
Some(b'\\') => {
if let Some(next) = bytes.next() {
out.push(next as char);
}
}
Some(other) => out.push(other as char),
None => break,
}
}
}
if out.is_empty() && !trimmed.is_empty() && !trimmed.starts_with('"') {
return trimmed.to_string();
}
out
}
fn parse_caa(value: &str) -> crate::Result<DnsRecord> {
let mut parts = value.splitn(3, char::is_whitespace);
let flags: u8 = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.parse()
.map_err(|e| Error::Parse(format!("invalid CAA flags in '{value}': {e}")))?;
let tag = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.to_ascii_lowercase();
let raw_value = parts
.next()
.ok_or_else(|| Error::Parse(format!("invalid CAA value '{value}'")))?
.trim();
let unquoted = raw_value
.strip_prefix('"')
.and_then(|s| s.strip_suffix('"'))
.map(|s| s.replace("\\\"", "\""))
.unwrap_or_else(|| raw_value.to_string());
let issuer_critical = flags & 0x80 != 0;
match tag.as_str() {
"issue" => {
let (name, options) = parse_caa_kv(&unquoted);
Ok(DnsRecord::CAA(CAARecord::Issue {
issuer_critical,
name,
options,
}))
}
"issuewild" => {
let (name, options) = parse_caa_kv(&unquoted);
Ok(DnsRecord::CAA(CAARecord::IssueWild {
issuer_critical,
name,
options,
}))
}
"iodef" => Ok(DnsRecord::CAA(CAARecord::Iodef {
issuer_critical,
url: unquoted,
})),
other => Err(Error::Parse(format!("unknown CAA tag: {other}"))),
}
}
fn parse_caa_kv(value: &str) -> (Option<String>, Vec<KeyValue>) {
let mut parts = value.split(';').map(str::trim);
let name_part = parts.next().unwrap_or("").trim().to_string();
let name = if name_part.is_empty() {
None
} else {
Some(name_part)
};
let options = parts
.filter(|p| !p.is_empty())
.map(|p| match p.split_once('=') {
Some((k, v)) => KeyValue {
key: k.trim().to_string(),
value: v.trim().to_string(),
},
None => KeyValue {
key: p.trim().to_string(),
value: String::new(),
},
})
.collect();
(name, options)
}
fn ensure_trailing_dot(value: String) -> String {
if value.ends_with('.') {
value
} else {
format!("{value}.")
}
}
fn strip_trailing_dot(value: &str) -> String {
value.strip_suffix('.').unwrap_or(value).to_string()
}