[pve-devel] [PATCH v3 proxmox-openid-rs] fix Open ID with Azure as provider

[Mira Limbeck <m.limbeck@proxmox.com>]

Azure doesn't accept `Transfer-Encoding: chunked` on their token endpoint,
but with the switch to ureq we always send requests with this set.

Fix by switching to `Content-Length` in the header instead. ureq only
sets `Transfer-Encoding: chunked` when the body length is not known
beforehand, which is the case when using `send`. See 
https://docs.rs/ureq/2.4.0/ureq/index.html#content-length-and-transfer-encoding

See https://forum.proxmox.com/threads/openid-401-with-azure-ad.105892/
for the issue.

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>
---
v3:
 - fixed link in inline comment

v2:
 - added inline comment
 - removed the unnecessary `let bytes = ...` line
 - changed link in commit message to versioned docs.rs

probably also fixes https://bugzilla.proxmox.com/show_bug.cgi?id=3916,
but I could only reproduce this exact error message with Azure until
now.

 src/http_client.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/http_client.rs b/src/http_client.rs
index a2bf6ee..e391421 100644
--- a/src/http_client.rs
+++ b/src/http_client.rs
@@ -75,7 +75,10 @@ pub fn http_client(request: HttpRequest) -> Result<HttpResponse, Error> {
     }
 
     let response = if let Method::POST = request.method {
-        req.send(&*request.body)
+        // send_bytes makes sure that Content-Length is set. This is important, because some
+        // endpoints don't accept `Transfer-Encoding: chunked`, which would otherwise be set.
+        // see https://docs.rs/ureq/2.4.0/ureq/index.html#content-length-and-transfer-encoding
+        req.send_bytes(request.body.as_slice())
     } else {
         req.call()
     }
-- 
2.30.2