get password from file

.gitignore

@@ -2,3 +2,4 @@
 /zig-cache
 /zig-out
 /config.json
+/password

src/main.zig

@@ -90,15 +90,29 @@ pub fn main() !void {
 
     const b64 = std.base64.standard.Encoder;
 
+    var password_buffer: [128]u8 = undefined;
+    var password: []const u8 = undefined;
+    if (config.value.loki.password_file) |password_file_path| {
+        password = try std.fs.cwd().readFile(password_file_path, &password_buffer);
+        password = std.mem.trimRight(u8, password, "\r\n");
+    } else if (config.value.loki.password) |password_data| {
+        @memcpy(&password_buffer, password_data);
+        password = password_buffer[0..password_data.len];
+    } else {
+        iperf3_log.err("unable to determine password!", .{});
+        return;
+    }
+
     var auth_buf: [256]u8 = undefined;
     const auth = try std.fmt.bufPrint(
         &auth_buf,
         "{s}:{s}",
         .{
             config.value.loki.username,
-            config.value.loki.password.?,
+            password,
         },
     );
+
     var auth_encoded_buf: [b64.calcSize(auth_buf.len)]u8 = undefined;
     var auth_encoded = b64.encode(&auth_encoded_buf, auth);
     var auth_header_buf: [256]u8 = undefined;
@@ -106,18 +120,9 @@ pub fn main() !void {
 
     const uri = try std.Uri.parse(config.value.loki.url);
 
-    // var headers = std.http.Headers{ .allocator = allocator };
-    // try headers.append("Authorization", auth_header);
-    // try headers.append("Content-Type", "application/json");
-
     var client = std.http.Client{ .allocator = allocator };
     defer client.deinit();
 
-    // const stderr_file = std.io.getStdErr().writer();
-    // var stderr_bw = std.io.bufferedWriter(stderr_file);
-    // const stderr = stderr_bw.writer();
-    // _ = stderr;
-
     var port_buf: [16]u8 = undefined;
     var port: []u8 = undefined;
     if (config.value.iperf3.port) |p| {