apt: allow changelog retrieval from enterprise repo

If a package is or will be installed from the enterprise repo, retrieve
the changelog from there as well (securely via HTTPS and authenticated
with the subcription key).

Extends the get_string method to take additional headers, in this case
used for 'Authorization'. Hyper does not have built-in basic auth
support AFAICT but it's simple enough to just build the header manually.

Take the opportunity and also set the User-Agent sensibly for GET
requests, just like for POST.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

src/api2/node/apt.rs

@@ -1,12 +1,13 @@
 use anyhow::{Error, bail, format_err};
 use serde_json::{json, Value};
+use std::collections::HashMap;
 
 use proxmox::list_subdirs_api_method;
 use proxmox::api::{api, RpcEnvironment, RpcEnvironmentType, Permission};
 use proxmox::api::router::{Router, SubdirMap};
 
 use crate::server::WorkerTask;
-use crate::tools::{apt, http};
+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};
@@ -202,9 +203,34 @@ fn apt_get_changelog(
     let changelog_url = &pkg_info[0].change_log_url;
     // FIXME: use 'apt-get changelog' for proxmox packages as well, once repo supports it
     if changelog_url.starts_with("http://download.proxmox.com/") {
-        let changelog = crate::tools::runtime::block_on(http::get_string(changelog_url))
+        let changelog = crate::tools::runtime::block_on(http::get_string(changelog_url, None))
             .map_err(|err| format_err!("Error downloading changelog from '{}': {}", changelog_url, err))?;
         return Ok(json!(changelog));
+
+    } else if changelog_url.starts_with("https://enterprise.proxmox.com/") {
+        let sub = match subscription::read_subscription()? {
+            Some(sub) => sub,
+            None => bail!("cannot retrieve changelog from enterprise repo: no subscription info found")
+        };
+        let (key, id) = match sub.key {
+            Some(key) => {
+                match sub.serverid {
+                    Some(id) => (key, id),
+                    None =>
+                        bail!("cannot retrieve changelog from enterprise repo: no server id found")
+                }
+            },
+            None => bail!("cannot retrieve changelog from enterprise repo: no subscription key found")
+        };
+
+        let mut auth_header = HashMap::new();
+        auth_header.insert("Authorization".to_owned(),
+            format!("Basic {}", base64::encode(format!("{}:{}", key, id))));
+
+        let changelog = crate::tools::runtime::block_on(http::get_string(changelog_url, Some(&auth_header)))
+            .map_err(|err| format_err!("Error downloading changelog from '{}': {}", changelog_url, err))?;
+        return Ok(json!(changelog));
+
     } else {
         let mut command = std::process::Command::new("apt-get");
         command.arg("changelog");