4 files changed, 99 insertions, 2 deletions
diff --git a/src/authentication_cleartext_password.zig b/src/authentication_cleartext_password.zig
new file mode 100644
index 0000000..e72f28d
--- /dev/null
+++ b/src/authentication_cleartext_password.zig
@@ -0,0 +1,47 @@
+const std = @import("std");
+const ProtocolError = @import("main.zig").ProtocolError;
+const AuthType = @import("main.zig").AuthType;
+const enum_from_int = @import("main.zig").enum_from_int;
+const ClientError = @import("main.zig").ClientError;
+const AuthenticationCleartextPassword = @This();
+const ByteArrayList = std.ArrayList(u8);
+
+pub const Tag: u8 = 'R';
+pub const Type: AuthType = AuthType.AuthTypeCleartextPassword;
+
+pub fn read(_: std.mem.Allocator, b: []const u8) !AuthenticationCleartextPassword {
+    if (b.len != 4) return ProtocolError.InvalidMessageLength;
+
+    const auth_type = enum_from_int(AuthType, std.mem.readIntBig(u32, b[0..4])) orelse return ClientError.UnsupportedAuthType;
+    if (auth_type != Type) return ProtocolError.InvalidAuthType;
+    return .{};
+}
+
+pub fn write(_: AuthenticationCleartextPassword, _: std.mem.Allocator, stream_writer: anytype) !void {
+    try stream_writer.writeByte(Tag);
+    try stream_writer.writeIntBig(u32, 8);
+    try stream_writer.writeIntBig(u32, @intFromEnum(Type));
+}
+
+pub fn deinit(_: *AuthenticationCleartextPassword, _: std.mem.Allocator) void {}
+
+test "round trip" {
+    const allocator = std.testing.allocator;
+    var sm = AuthenticationCleartextPassword{};
+    defer sm.deinit(allocator);
+
+    var bal = ByteArrayList.init(allocator);
+    defer bal.deinit();
+    try sm.write(allocator, bal.writer());
+
+    var fbs = std.io.fixedBufferStream(bal.items);
+    var reader = fbs.reader();
+    const tag = try reader.readByte();
+    try std.testing.expectEqual(Tag, tag);
+    const len = try reader.readIntBig(u32);
+    const buf = try allocator.alloc(u8, len - 4);
+    defer allocator.free(buf);
+    try reader.readNoEof(buf);
+    var sm2 = try AuthenticationCleartextPassword.read(allocator, buf);
+    defer sm2.deinit(allocator);
+}
diff --git a/src/authentication_ok.zig b/src/authentication_ok.zig
index 3c31375..0f0702b 100644
--- a/src/authentication_ok.zig
+++ b/src/authentication_ok.zig
@@ -7,19 +7,20 @@ const AuthenticationOk = @This();
 const ByteArrayList = std.ArrayList(u8);
 
 pub const Tag: u8 = 'R';
+pub const Type: AuthType = AuthType.AuthTypeCleartextPassword;
 
 pub fn read(_: std.mem.Allocator, b: []const u8) !AuthenticationOk {
     if (b.len != 4) return ProtocolError.InvalidMessageLength;
 
     const auth_type = enum_from_int(AuthType, std.mem.readIntBig(u32, b[0..4])) orelse return ClientError.UnsupportedAuthType;
-    if (auth_type != AuthType.AuthTypeOk) return ProtocolError.InvalidAuthType;
+    if (auth_type != Type) return ProtocolError.InvalidAuthType;
     return .{};
 }
 
 pub fn write(_: AuthenticationOk, _: std.mem.Allocator, stream_writer: anytype) !void {
     try stream_writer.writeByte(Tag);
     try stream_writer.writeIntBig(u32, 8);
-    try stream_writer.writeIntBig(u32, @intFromEnum(AuthType.AuthTypeOk));
+    try stream_writer.writeIntBig(u32, @intFromEnum(Type));
 }
 
 pub fn deinit(_: *AuthenticationOk, _: std.mem.Allocator) void {}
diff --git a/src/main.zig b/src/main.zig
index 4bed468..24e86c4 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -2,6 +2,8 @@ const std = @import("std");
 const testing = std.testing;
 const StartupMessage = @import("startup_message.zig");
 const AuthenticationOk = @import("authentication_ok.zig");
+const AuthenticationCleartextPassword = @import("authentication_cleartext_password.zig");
+const PasswordMessage = @import("password_message.zig");
 
 pub const ProtocolError = error{
     InvalidProtocolVersion,
@@ -16,6 +18,7 @@ pub const ClientError = error{
 
 pub const AuthType = enum(u32) {
     AuthTypeOk = 0,
+    AuthTypeCleartextPassword = 3,
 };
 
 // Fallible version of enumFromInt
@@ -36,4 +39,6 @@ pub fn enum_from_int(comptime e: type, i: anytype) ?e {
 test {
     _ = StartupMessage;
     _ = AuthenticationOk;
+    _ = AuthenticationCleartextPassword;
+    _ = PasswordMessage;
 }
diff --git a/src/password_message.zig b/src/password_message.zig
new file mode 100644
index 0000000..33214bf
--- /dev/null
+++ b/src/password_message.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+const ByteArrayList = std.ArrayList(u8);
+const PasswordMessage = @This();
+
+pub const Tag: u8 = 'p';
+password: []const u8,
+password_owned: bool = false,
+
+
+pub fn read(allocator: std.mem.Allocator, b: []const u8) !PasswordMessage {
+    return .{ .password = try allocator.dupe(u8, b), .password_owned = true };
+}
+pub fn write(self: PasswordMessage, _: std.mem.Allocator, stream_writer: anytype) !void {
+    try stream_writer.writeByte(Tag);
+    try stream_writer.writeIntBig(u32, 5 + @as(u32, @intCast(self.password.len)));
+    try stream_writer.writeAll(self.password);
+    try stream_writer.writeByte(0);
+}
+pub fn deinit(self: *PasswordMessage, allocator: std.mem.Allocator) void {
+    if (self.password_owned) allocator.free(self.password);
+}
+
+test "round trip" {
+    const allocator = std.testing.allocator;
+    var sm = PasswordMessage{
+        .password = "foobar",
+    };
+    defer sm.deinit(allocator);
+
+    var bal = ByteArrayList.init(allocator);
+    defer bal.deinit();
+    try sm.write(allocator, bal.writer());
+
+    var fbs = std.io.fixedBufferStream(bal.items);
+    var reader = fbs.reader();
+    const tag = try reader.readByte();
+    try std.testing.expectEqual(Tag, tag);
+    const len = try reader.readIntBig(u32);
+    const buf = try allocator.alloc(u8, len - 4);
+    defer allocator.free(buf);
+    try reader.readNoEof(buf);
+    var sm2 = try PasswordMessage.read(allocator, buf);
+    defer sm2.deinit(allocator);
+}