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::{borrow::Cow, time::Duration};
const DEFAULT_API_ENDPOINT: &str = "https://api.vultr.com/v2";
const LIST_PAGE_SIZE: u32 = 500;
#[derive(Clone)]
pub struct VultrProvider {
client: HttpClient,
endpoint: Cow<'static, str>,
}
#[derive(Deserialize, Debug)]
struct DomainRecordsResponse {
records: Vec<VultrRecord>,
#[serde(default)]
meta: Meta,
}
#[derive(Deserialize, Debug, Default)]
struct Meta {
#[serde(default)]
links: MetaLinks,
}
#[derive(Deserialize, Debug, Default)]
struct MetaLinks {
#[serde(default)]
next: String,
}
#[derive(Deserialize, Debug, Clone)]
struct VultrRecord {
id: String,
#[serde(rename = "type")]
record_type: String,
name: String,
data: String,
#[serde(default)]
priority: i32,
}
#[derive(Serialize, Debug)]
struct CreateRecordRequest<'a> {
name: &'a str,
#[serde(rename = "type")]
record_type: &'static str,
data: String,
ttl: u32,
#[serde(skip_serializing_if = "Option::is_none")]
priority: Option<u16>,
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct RecordPayload {
data: String,
priority: Option<u16>,
}
impl VultrProvider {
pub(crate) fn new(api_key: impl AsRef<str>, timeout: Option<Duration>) -> Self {
let client = HttpClientBuilder::default()
.with_header("Authorization", format!("Bearer {}", api_key.as_ref()))
.with_timeout(timeout)
.build();
Self {
client,
endpoint: Cow::Borrowed(DEFAULT_API_ENDPOINT),
}
}
#[cfg(test)]
pub(crate) fn with_endpoint(self, endpoint: impl Into<Cow<'static, str>>) -> Self {
Self {
endpoint: endpoint.into(),
..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)?;
let domain = origin.into_name().into_owned();
let name = name.into_name().into_owned();
let subdomain = strip_origin_from_name(&name, &domain, Some(""));
let desired = build_payloads(record_type, records)?;
let existing = self.list_at(&domain, &subdomain, record_type).await?;
let mut existing_pool: Vec<VultrRecord> = existing;
let mut to_add: Vec<RecordPayload> = Vec::new();
for payload in desired {
if let Some(idx) = existing_pool
.iter()
.position(|r| matches_payload(r, &payload))
{
existing_pool.swap_remove(idx);
} else {
to_add.push(payload);
}
}
for entry in existing_pool {
self.delete_record(&domain, &entry.id).await?;
}
for payload in to_add {
self.create_record(&domain, &subdomain, record_type, ttl, payload)
.await?;
}
Ok(())
}
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)?;
if records.is_empty() {
return Ok(());
}
let domain = origin.into_name().into_owned();
let name = name.into_name().into_owned();
let subdomain = strip_origin_from_name(&name, &domain, Some(""));
let desired = build_payloads(record_type, records)?;
let existing = self.list_at(&domain, &subdomain, record_type).await?;
for payload in desired {
if existing.iter().any(|r| matches_payload(r, &payload)) {
continue;
}
self.create_record(&domain, &subdomain, record_type, ttl, payload)
.await?;
}
Ok(())
}
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)?;
if records.is_empty() {
return Ok(());
}
let domain = origin.into_name().into_owned();
let name = name.into_name().into_owned();
let subdomain = strip_origin_from_name(&name, &domain, Some(""));
let to_remove = build_payloads(record_type, records)?;
let existing = self.list_at(&domain, &subdomain, record_type).await?;
for payload in to_remove {
if let Some(entry) = existing.iter().find(|r| matches_payload(r, &payload)) {
self.delete_record(&domain, &entry.id).await?;
}
}
Ok(())
}
pub(crate) async fn list_rrset(
&self,
name: impl IntoFqdn<'_>,
record_type: DnsRecordType,
origin: impl IntoFqdn<'_>,
) -> crate::Result<Vec<DnsRecord>> {
let domain = origin.into_name().into_owned();
let name = name.into_name().into_owned();
let subdomain = strip_origin_from_name(&name, &domain, Some(""));
let listed = self.list_at(&domain, &subdomain, record_type).await?;
listed.into_iter().map(record_from_vultr).collect()
}
async fn list_at(
&self,
domain: &str,
subdomain: &str,
record_type: DnsRecordType,
) -> crate::Result<Vec<VultrRecord>> {
let wanted_type = record_type.as_str();
let mut out: Vec<VultrRecord> = Vec::new();
let mut cursor: Option<String> = None;
loop {
let url = match &cursor {
Some(c) => format!(
"{}/domains/{domain}/records?per_page={LIST_PAGE_SIZE}&cursor={}",
self.endpoint,
urlencode(c)
),
None => format!(
"{}/domains/{domain}/records?per_page={LIST_PAGE_SIZE}",
self.endpoint
),
};
let response: DomainRecordsResponse = self.client.get(url).send_with_retry(3).await?;
for record in response.records {
if record.name == subdomain && record.record_type == wanted_type {
out.push(record);
}
}
if response.meta.links.next.is_empty() {
break;
}
cursor = Some(response.meta.links.next);
}
Ok(out)
}
async fn create_record(
&self,
domain: &str,
subdomain: &str,
record_type: DnsRecordType,
ttl: u32,
payload: RecordPayload,
) -> crate::Result<()> {
let body = CreateRecordRequest {
name: subdomain,
record_type: record_type.as_str(),
data: payload.data,
ttl,
priority: payload.priority,
};
self.client
.post(format!("{}/domains/{domain}/records", self.endpoint))
.with_body(body)?
.send_with_retry::<serde_json::Value>(3)
.await
.map(|_| ())
}
async fn delete_record(&self, domain: &str, record_id: &str) -> crate::Result<()> {
self.client
.delete(format!(
"{}/domains/{domain}/records/{record_id}",
self.endpoint
))
.send_with_retry::<serde_json::Value>(3)
.await
.map(|_| ())
}
}
fn urlencode(value: &str) -> String {
serde_urlencoded::to_string([("cursor", value)])
.ok()
.and_then(|s| s.strip_prefix("cursor=").map(|s| s.to_string()))
.unwrap_or_else(|| value.to_string())
}
fn matches_payload(record: &VultrRecord, payload: &RecordPayload) -> bool {
if record.data != payload.data {
return false;
}
match payload.priority {
Some(p) => record.priority == p as i32,
None => true,
}
}
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 build_payloads(
expected_type: DnsRecordType,
records: Vec<DnsRecord>,
) -> crate::Result<Vec<RecordPayload>> {
let mut out = Vec::with_capacity(records.len());
for record in records {
if record.as_type() != expected_type {
return Err(Error::Api(format!(
"RRSet record type mismatch: expected {}, got {}",
expected_type.as_str(),
record.as_type().as_str(),
)));
}
out.push(build_payload(record)?);
}
Ok(out)
}
fn build_payload(record: DnsRecord) -> crate::Result<RecordPayload> {
let priority = match &record {
DnsRecord::MX(mx) => Some(mx.priority),
DnsRecord::SRV(srv) => Some(srv.priority),
_ => None,
};
let data = record_target(&record)?;
Ok(RecordPayload { data, priority })
}
fn record_target(record: &DnsRecord) -> Result<String, Error> {
match record {
DnsRecord::A(addr) => Ok(addr.to_string()),
DnsRecord::AAAA(addr) => Ok(addr.to_string()),
DnsRecord::CNAME(content) => Ok(content.clone()),
DnsRecord::NS(content) => Ok(content.clone()),
DnsRecord::MX(mx) => Ok(mx.exchange.clone()),
DnsRecord::TXT(content) => {
let mut out = String::new();
txt_chunks_to_text(&mut out, content, " ");
Ok(out)
}
DnsRecord::SRV(srv) => Ok(format!("{} {} {}", srv.weight, srv.port, srv.target)),
DnsRecord::TLSA(_) => Err(Error::Unsupported(
"TLSA records are not supported by Vultr".to_string(),
)),
DnsRecord::CAA(caa) => {
let (flags, tag, value) = caa.clone().decompose();
Ok(format!("{flags} {tag} \"{value}\""))
}
}
}
fn record_from_vultr(record: VultrRecord) -> crate::Result<DnsRecord> {
let priority_u16 = if record.priority < 0 {
0
} else {
record.priority as u16
};
match record.record_type.as_str() {
"A" => record
.data
.parse()
.map(DnsRecord::A)
.map_err(|e| Error::Parse(format!("invalid A record data {}: {e}", record.data))),
"AAAA" => record
.data
.parse()
.map(DnsRecord::AAAA)
.map_err(|e| Error::Parse(format!("invalid AAAA record data {}: {e}", record.data))),
"CNAME" => Ok(DnsRecord::CNAME(record.data)),
"NS" => Ok(DnsRecord::NS(record.data)),
"MX" => Ok(DnsRecord::MX(MXRecord {
exchange: record.data,
priority: priority_u16,
})),
"TXT" => Ok(DnsRecord::TXT(unquote_txt(&record.data))),
"SRV" => parse_srv(&record.data, priority_u16),
"CAA" => parse_caa(&record.data),
other => Err(Error::Parse(format!(
"unsupported Vultr record type: {other}"
))),
}
}
fn unquote_txt(content: &str) -> String {
let mut out = String::with_capacity(content.len());
let mut in_chunk = false;
let mut escape = false;
for ch in content.chars() {
if escape {
out.push(ch);
escape = false;
continue;
}
match ch {
'\\' if in_chunk => escape = true,
'"' => in_chunk = !in_chunk,
_ if in_chunk => out.push(ch),
_ => {}
}
}
if out.is_empty() && !content.is_empty() && !content.starts_with('"') {
return content.to_string();
}
out
}
fn parse_srv(data: &str, priority: u16) -> crate::Result<DnsRecord> {
let mut parts = data.split_whitespace();
let weight = parts
.next()
.and_then(|s| s.parse::<u16>().ok())
.ok_or_else(|| Error::Parse(format!("invalid SRV weight in {data}")))?;
let port = parts
.next()
.and_then(|s| s.parse::<u16>().ok())
.ok_or_else(|| Error::Parse(format!("invalid SRV port in {data}")))?;
let target = parts
.next()
.ok_or_else(|| Error::Parse(format!("missing SRV target in {data}")))?
.to_string();
Ok(DnsRecord::SRV(SRVRecord {
priority,
weight,
port,
target,
}))
}
fn parse_caa(data: &str) -> crate::Result<DnsRecord> {
let trimmed = data.trim();
let (flags_str, rest) = trimmed
.split_once(char::is_whitespace)
.ok_or_else(|| Error::Parse(format!("invalid CAA record: {data}")))?;
let flags: u8 = flags_str
.parse()
.map_err(|e| Error::Parse(format!("invalid CAA flags in {data}: {e}")))?;
let rest = rest.trim_start();
let (tag, value_part) = rest
.split_once(char::is_whitespace)
.ok_or_else(|| Error::Parse(format!("invalid CAA record: {data}")))?;
let value = value_part.trim().trim_matches('"').to_string();
let issuer_critical = flags & 0x80 != 0;
let record = match tag {
"issue" => {
let (name, options) = parse_caa_value(&value);
CAARecord::Issue {
issuer_critical,
name,
options,
}
}
"issuewild" => {
let (name, options) = parse_caa_value(&value);
CAARecord::IssueWild {
issuer_critical,
name,
options,
}
}
"iodef" => CAARecord::Iodef {
issuer_critical,
url: value,
},
other => return Err(Error::Parse(format!("unknown CAA tag: {other}"))),
};
Ok(DnsRecord::CAA(record))
}
fn parse_caa_value(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)
}