Abstract reading the login data from the request.

dudeswave/src/dudeswave_auth.erl

@@ -26,7 +26,7 @@ from the dudeswave database.
 
 -export([authenticate/2, details/1, new/3,
     update/4, delete/1, logout/2, auth_cookies/1, invalidate_cookies/1,
-    set_auth_cookies/4]).
+    set_auth_cookies/4, read_login_data/1]).
 
 -doc """
 Verify a session with an existing cookie.
@@ -323,3 +323,27 @@ set_auth_cookies(Req, User, Cookie, Validity) ->
 	    #{max_age => Validity}),
 
 	Req1.
+
+-doc """
+Spec:
+
+```
+-spec read_login_data(Req) -> {User, Pass, Req0} when
+	Req :: cowboy_req:req(),
+	User :: binary(),
+	Pass :: binary(),
+	Req0 :: cowboy_req:req().
+```
+Read the login details from the `Req` body and return `User` and `Password`.
+""".
+-spec read_login_data(Req) -> {User, Pass, Req0} when
+	Req :: cowboy_req:req(),
+	User :: binary(),
+	Pass :: binary(),
+	Req0 :: cowboy_req:req().
+
+read_login_data(Req) ->
+	{ok, Data, Req0} = cowboy_req:read_body(Req),
+	#{<<"user">> := User, <<"password">> := Pass} = json:decode(Data),
+
+	{User, Pass, Req0}.

dudeswave/src/dudeswave_auth_handler.erl

@@ -151,8 +151,7 @@ delete_completed(Req, State) -> {false, Req, State}.
 %
 
 login(Req, State) ->
-	{ok, Data, Req0} = cowboy_req:read_body(Req),
+	{User, Pass, Req0} = dudeswave_auth:read_login_data(Req),
-	#{<<"user">> := User, <<"password">> := Pass} = json:decode(Data),
 
 	case dudeswave_auth:authenticate(User, {password, Pass}) of
 		{true, Cookie, Validity} ->