acme: use proxmox-acme-plugins and load schema from there

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/control

@@ -113,6 +113,7 @@ Architecture: any
 Depends: fonts-font-awesome,
          libjs-extjs (>= 6.0.1),
          libjs-qrcodejs (>= 1.20201119),
+         libproxmox-acme-plugins,
          libsgutils2-2,
          libzstd1 (>= 1.3.8),
          lvm2,

debian/control.in

@@ -3,6 +3,7 @@ Architecture: any
 Depends: fonts-font-awesome,
          libjs-extjs (>= 6.0.1),
          libjs-qrcodejs (>= 1.20201119),
+         libproxmox-acme-plugins,
          libsgutils2-2,
          libzstd1 (>= 1.3.8),
          lvm2,

src/api2/config/acme.rs

@@ -1,6 +1,10 @@
+use std::fs;
 use std::path::Path;
+use std::sync::{Arc, Mutex};
+use std::time::SystemTime;
 
 use anyhow::{bail, format_err, Error};
+use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
 
@@ -386,6 +390,43 @@ fn get_directories() -> Result<&'static [KnownAcmeDirectory], Error> {
     Ok(crate::config::acme::KNOWN_ACME_DIRECTORIES)
 }
 
+/// Wrapper for efficient Arc use when returning the ACME challenge-plugin schema for serializing
+struct ChallengeSchemaWrapper {
+    inner: Arc<Vec<AcmeChallengeSchema>>,
+}
+
+impl Serialize for ChallengeSchemaWrapper {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        self.inner.serialize(serializer)
+    }
+}
+
+fn get_cached_challenge_schemas() -> Result<ChallengeSchemaWrapper, Error> {
+    lazy_static! {
+        static ref CACHE: Mutex<Option<(Arc<Vec<AcmeChallengeSchema>>, SystemTime)>> =
+            Mutex::new(None);
+    }
+
+    // the actual loading code
+    let mut last = CACHE.lock().unwrap();
+
+    let actual_mtime = fs::metadata(crate::config::acme::ACME_DNS_SCHEMA_FN)?.modified()?;
+
+    let schema = match &*last {
+        Some((schema, cached_mtime)) if *cached_mtime >= actual_mtime => schema.clone(),
+        _ => {
+            let new_schema = Arc::new(crate::config::acme::load_dns_challenge_schema()?);
+            *last = Some((Arc::clone(&new_schema), actual_mtime));
+            new_schema
+        }
+    };
+
+    Ok(ChallengeSchemaWrapper { inner: schema })
+}
+
 #[api(
     access: {
         permission: &Permission::Anybody,
@@ -397,18 +438,8 @@ fn get_directories() -> Result<&'static [KnownAcmeDirectory], Error> {
     },
 )]
 /// Get named known ACME directory endpoints.
-fn get_challenge_schema() -> Result<Vec<AcmeChallengeSchema>, Error> {
-    let mut out = Vec::new();
-    crate::config::acme::foreach_dns_plugin(|id| {
-        out.push(AcmeChallengeSchema {
-            id: id.to_owned(),
-            name: id.to_owned(),
-            ty: "dns",
-            schema: Value::Object(Default::default()),
-        });
-        ControlFlow::Continue(())
-    })?;
-    Ok(out)
+fn get_challenge_schema() -> Result<ChallengeSchemaWrapper, Error> {
+    get_cached_challenge_schemas()
 }
 
 #[api]

src/config/acme/mod.rs

@@ -2,12 +2,14 @@ use std::collections::HashMap;
 use std::path::Path;
 
 use anyhow::{bail, format_err, Error};
+use serde_json::Value;
 
 use proxmox::sys::error::SysError;
-use proxmox::tools::fs::CreateOptions;
+use proxmox::tools::fs::{CreateOptions, file_read_string};
 
 use crate::api2::types::{
     PROXMOX_SAFE_ID_REGEX,
+    AcmeChallengeSchema,
     KnownAcmeDirectory,
     AcmeAccountName,
 };
@@ -16,6 +18,8 @@ use crate::tools::ControlFlow;
 pub(crate) const ACME_DIR: &str = configdir!("/acme");
 pub(crate) const ACME_ACCOUNT_DIR: &str = configdir!("/acme/accounts");
 
+pub(crate) const ACME_DNS_SCHEMA_FN: &str = "/usr/share/proxmox-acme/dns-challenge-schema.json";
+
 pub mod plugin;
 
 // `const fn`ify this once it is supported in `proxmox`
@@ -141,6 +145,25 @@ pub fn mark_account_deactivated(name: &str) -> Result<(), Error> {
     );
 }
 
+pub fn load_dns_challenge_schema() -> Result<Vec<AcmeChallengeSchema>, Error> {
+    let raw = file_read_string(&ACME_DNS_SCHEMA_FN)?;
+    let schemas: serde_json::Map<String, Value> = serde_json::from_str(&raw)?;
+
+    Ok(schemas
+        .iter()
+        .map(|(id, schema)| AcmeChallengeSchema {
+            id: id.to_owned(),
+            name: schema
+                .get("name")
+                .and_then(Value::as_str)
+                .unwrap_or(id)
+                .to_owned(),
+            ty: "dns",
+            schema: schema.to_owned(),
+        })
+        .collect())
+}
+
 pub fn complete_acme_account(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
     let mut out = Vec::new();
     let _ = foreach_acme_account(|name| {