Factor out POST requests

src/net/http.rs

@@ -221,3 +221,32 @@ pub(crate) async fn get_client(context: &Context, load_cache: bool) -> Result<re
     };
     Ok(builder.build()?)
 }
+
+/// Sends an empty POST request to the URL.
+///
+/// Returns response text and whether request was successful or not.
+pub(crate) async fn post_empty(context: &Context, url: &str) -> Result<(String, bool)> {
+    let parsed_url = url
+        .parse::<hyper::Uri>()
+        .with_context(|| format!("Failed to parse URL {url:?}"))?;
+    let scheme = parsed_url.scheme_str().context("URL has no scheme")?;
+    if scheme != "https" {
+        bail!("POST requests to non-HTTPS URLs are not allowed");
+    }
+
+    // As only HTTPS is used, it is safe to load DNS cache.
+    let load_cache = true;
+
+    let response = crate::net::http::get_client(context, load_cache)
+        .await?
+        .post(url)
+        .send()
+        .await?;
+    let response_status = response.status();
+    let response_text = response
+        .text()
+        .await
+        .context("Request failed: empty response")?;
+
+    Ok((response_text, response_status.is_success()))
+}

src/qr.rs

@@ -19,6 +19,7 @@ use crate::context::Context;
 use crate::events::EventType;
 use crate::key::Fingerprint;
 use crate::message::Message;
+use crate::net::http::post_empty;
 use crate::peerstate::Peerstate;
 use crate::token;
 use crate::tools::validate_id;
@@ -645,21 +646,8 @@ async fn set_account_from_qr(context: &Context, qr: &str) -> Result<()> {
         bail!("DCACCOUNT QR codes must use HTTPS scheme");
     }
 
-    // As only HTTPS is used, it is safe to load DNS cache.
-    let load_cache = true;
-
-    let response = crate::net::http::get_client(context, load_cache)
-        .await?
-        .post(url_str)
-        .send()
-        .await?;
-    let response_status = response.status();
-    let response_text = response
-        .text()
-        .await
-        .context("Cannot create account, request failed: empty response")?;
-
-    if response_status.is_success() {
+    let (response_text, response_success) = post_empty(context, url_str).await?;
+    if response_success {
         let CreateAccountSuccessResponse { password, email } = serde_json::from_str(&response_text)
             .with_context(|| {
                 format!("Cannot create account, response is malformed:\n{response_text:?}")