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/tools/apt.rs

@@ -128,8 +128,13 @@ fn get_changelog_url(
             None => bail!("incompatible filename, doesn't match regex")
         };
 
-        return Ok(format!("http://download.proxmox.com/{}/{}_{}.changelog",
-                          base, package, version));
+        if component == "pbs-enterprise" {
+            return Ok(format!("https://enterprise.proxmox.com/{}/{}_{}.changelog",
+                              base, package, version));
+        } else {
+            return Ok(format!("http://download.proxmox.com/{}/{}_{}.changelog",
+                              base, package, version));
+        }
     }
 
     bail!("unknown origin ({}) or component ({})", origin, component)

src/tools/http.rs

@@ -2,6 +2,7 @@ use anyhow::{Error, format_err, bail};
 use lazy_static::lazy_static;
 use std::task::{Context, Poll};
 use std::os::unix::io::AsRawFd;
+use std::collections::HashMap;
 
 use hyper::{Uri, Body};
 use hyper::client::{Client, HttpConnector};
@@ -26,8 +27,21 @@ lazy_static! {
     };
 }
 
-pub async fn get_string(uri: &str) -> Result<String, Error> {
-    let res = HTTP_CLIENT.get(uri.parse()?).await?;
+pub async fn get_string(uri: &str, extra_headers: Option<&HashMap<String, String>>) -> Result<String, Error> {
+    let mut request = Request::builder()
+        .method("GET")
+        .uri(uri)
+        .header("User-Agent", "proxmox-backup-client/1.0");
+
+    if let Some(hs) = extra_headers {
+        for (h, v) in hs.iter() {
+            request = request.header(h, v);
+        }
+    }
+
+    let request = request.body(Body::empty())?;
+
+    let res = HTTP_CLIENT.request(request).await?;
 
     let status = res.status();
     if !status.is_success() {