[pbs-devel] [PATCH v4 proxmox-backup 06/10] api: apt: add repositories call

[Fabian Ebner <f.ebner@proxmox.com>]

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
---

Changes from v3:
    * adapt to new library behavior
    * add helper to calculate common digest
    * return successfully parsed files and errors separately

 src/api2/node/apt.rs | 83 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 1 deletion(-)

diff --git a/src/api2/node/apt.rs b/src/api2/node/apt.rs
index e77b89fa..c91d03e1 100644
--- a/src/api2/node/apt.rs
+++ b/src/api2/node/apt.rs
@@ -1,16 +1,19 @@
 use anyhow::{Error, bail, format_err};
 use serde_json::{json, Value};
+use std::collections::BTreeMap;
 use std::collections::HashMap;
 
 use proxmox::list_subdirs_api_method;
 use proxmox::api::{api, RpcEnvironment, RpcEnvironmentType, Permission};
 use proxmox::api::router::{Router, SubdirMap};
 
+use proxmox_apt::types::{APTRepositoryFile, APTRepositoryFileError};
+
 use crate::server::WorkerTask;
 use crate::tools::{apt, http, subscription};
 
 use crate::config::acl::{PRIV_SYS_AUDIT, PRIV_SYS_MODIFY};
-use crate::api2::types::{Authid, APTUpdateInfo, NODE_SCHEMA, UPID_SCHEMA};
+use crate::api2::types::{Authid, APTUpdateInfo, NODE_SCHEMA, PROXMOX_CONFIG_DIGEST_SCHEMA, UPID_SCHEMA};
 
 #[api(
     input: {
@@ -350,8 +353,86 @@ pub fn get_versions() -> Result<Vec<APTUpdateInfo>, Error> {
     Ok(packages)
 }
 
+/// Calculates a common digest for successfully parsed repository files.
+///
+/// The digest is invariant with respect to file order.
+///
+/// Files without a digest are ignored.
+fn repositories_common_digest(files: &Vec<APTRepositoryFile>) -> [u8; 32] {
+    let mut digests = BTreeMap::new();
+
+    for file in files.iter() {
+        digests.insert(file.path.clone(), &file.digest);
+    }
+
+    let mut common_raw = Vec::<u8>::with_capacity(digests.len() * 32);
+    for digest in digests.values() {
+        match digest {
+            Some(digest) => common_raw.extend_from_slice(&digest[..]),
+            None => (),
+        }
+    }
+
+    openssl::sha::sha256(&common_raw[..])
+}
+
+#[api(
+    input: {
+        properties: {
+            node: {
+                schema: NODE_SCHEMA,
+            },
+        },
+    },
+    returns: {
+        type: Object,
+        description: "Result from parsing the APT repository files in /etc/apt/.",
+        properties: {
+            files: {
+                description: "List of parsed repository files.",
+                type: Array,
+                items: {
+                    type: APTRepositoryFile,
+                }
+            },
+            errors: {
+                description: "List of problematic files.",
+                type: Array,
+                items: {
+                    type: APTRepositoryFileError,
+                }
+            },
+            digest: {
+                schema: PROXMOX_CONFIG_DIGEST_SCHEMA,
+            },
+        },
+    },
+    access: {
+        permission: &Permission::Privilege(&[], PRIV_SYS_AUDIT, false),
+    },
+)]
+/// Get APT repository information
+pub fn get_repositories() -> Result<Value, Error> {
+    let (files, errors) = proxmox_apt::repositories::repositories()?;
+
+    if files.len() == 0 {
+        bail!("no APT repository files could be parsed!");
+    }
+
+    let common_digest = repositories_common_digest(&files);
+
+    let hex_digest = proxmox::tools::digest_to_hex(&common_digest);
+
+    Ok(json!({
+        "files": files,
+        "errors": errors,
+        "digest": hex_digest,
+    }))
+}
+
 const SUBDIRS: SubdirMap = &[
     ("changelog", &Router::new().get(&API_METHOD_APT_GET_CHANGELOG)),
+    ("repositories", &Router::new().get(&API_METHOD_GET_REPOSITORIES)),
     ("update", &Router::new()
         .get(&API_METHOD_APT_UPDATE_AVAILABLE)
         .post(&API_METHOD_APT_UPDATE_DATABASE)
-- 
2.20.1