clean readCredentials

.gitignore

@@ -1,2 +1,3 @@
 zig-out
 .zig-cache/
+.credentials

src/main.zig

@@ -13,14 +13,37 @@ const AuthResult = struct {
     user_uuid: []const u8,
 };
 
-fn readCredentials(allocator: std.mem.Allocator) !struct { username: []const u8, password: []const u8, content: []const u8 } {
-    const file = try std.fs.cwd().openFile("../.credentials", .{});
+const CognitoCredentials = struct {
+    allocator: std.mem.Allocator,
+    buffer: []const u8,
+    username: []const u8,
+    password: []const u8,
+
+    pub fn deinit(self: *CognitoCredentials) void {
+        self.allocator.free(self.buffer);
+        self.buffer = undefined;
+        self.username = undefined;
+        self.password = undefined;
+    }
+};
+fn readCredentials(allocator: std.mem.Allocator) !CognitoCredentials {
+    // TODO: something different
+    const file = try std.fs.cwd().openFile(".credentials", .{});
     defer file.close();
     const content = try file.readToEndAlloc(allocator, 1024);
-    var it = std.mem.splitScalar(u8, std.mem.trim(u8, content, &std.ascii.whitespace), '\n');
+    var it = std.mem.splitScalar(u8, std.mem.trim(
+        u8,
+        content,
+        &std.ascii.whitespace,
+    ), '\n');
     const username = it.next() orelse return error.InvalidCredentials;
     const password = it.next() orelse return error.InvalidCredentials;
-    return .{ .username = username, .password = password, .content = content };
+    return .{
+        .username = username,
+        .password = password,
+        .buffer = content,
+        .allocator = allocator,
+    };
 }
 
 fn authenticate(allocator: std.mem.Allocator, username: []const u8, password: []const u8) !AuthResult {
@@ -164,8 +187,8 @@ pub fn main() !void {
     defer _ = gpa.deinit();
     const allocator = gpa.allocator();
 
-    const creds = try readCredentials(allocator);
-    defer allocator.free(creds.content);
+    var creds = try readCredentials(allocator);
+    defer creds.deinit();
 
     std.debug.print("🔐 Authenticating...\n", .{});
     const auth = try authenticate(allocator, creds.username, creds.password);