Allow guest access to user_profile with an empty profile

I want this so that the Go application does not need to know the exact
details of the settings that the database sets when applying the cookie;
it just needs to select from the user_profile that already knows this.

Also, that way i can get the user’s language from its profile with a
single select, without having to check whether we are guest or
authenticated.

With that, i can skip the content negotiation if the user already told
us what language they want.

deploy/user_profile.sql

@@ -17,8 +17,33 @@ select user_id
      , lang_tag
 from auth."user"
 where cookie = current_app_user()
+  and cookie_expires_at > current_timestamp
+  and length(cookie) > 30
+union all
+select 0
+     , null::email
+     , ''
+     , 'guest'::name
+     , 'und'
+where not exists (
+	select 1
+	from auth."user"
+	where cookie = current_app_user()
+	  and cookie_expires_at > current_timestamp
+	  and length(cookie) > 30
+);
+
+create rule update_user_profile as on update to user_profile
+do instead update auth."user"
+set email = new.email
+  , name = new.name
+  , lang_tag = new.lang_tag
+where cookie = current_app_user()
+  and cookie_expires_at > current_timestamp
+  and length(cookie) > 30
 ;
 
+grant select on table user_profile to guest;
 grant select, update(email, name, lang_tag) on table user_profile to invoicer;
 grant select, update(email, name, lang_tag) on table user_profile to admin;
 

pkg/locale.go

@@ -24,14 +24,18 @@ func Locale(db *Db, next http.Handler) http.Handler {
 
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		var locale *gotext.Locale
-		t, _, err := language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
-		if err == nil {
-			tag, _, _ := matcher.Match(t...)
-			var ok bool
-			locale, ok = locales[tag]
-			for !ok && !tag.IsRoot() {
-				tag = tag.Parent()
+		user := getUser(r)
+		locale = locales[user.Language]
+		if locale == nil {
+			t, _, err := language.ParseAcceptLanguage(r.Header.Get("Accept-Language"))
+			if err == nil {
+				tag, _, _ := matcher.Match(t...)
+				var ok bool
 				locale, ok = locales[tag]
+				for !ok && !tag.IsRoot() {
+					tag = tag.Parent()
+					locale, ok = locales[tag]
+				}
 			}
 		}
 		if locale == nil {

pkg/login.go

@@ -5,6 +5,8 @@ import (
 	"net"
 	"net/http"
 	"time"
+
+	"golang.org/x/text/language"
 )
 
 const (
@@ -25,6 +27,7 @@ type AppUser struct {
 	Email    string
 	LoggedIn bool
 	Role     string
+	Language language.Tag
 }
 
 func LoginHandler() http.Handler {
@@ -103,11 +106,13 @@ func CheckLogin(db *Db, next http.Handler) http.Handler {
 			LoggedIn: false,
 			Role:     defaultRole,
 		}
-		row := conn.QueryRow(ctx, "select current_setting('request.user.email', true), current_user")
-		if err := row.Scan(&user.Email, &user.Role); err != nil {
+		row := conn.QueryRow(ctx, "select coalesce(email, ''), role, lang_tag from user_profile")
+		var langTag string
+		if err := row.Scan(&user.Email, &user.Role, &langTag); err != nil {
 			panic(err)
 		}
 		user.LoggedIn = user.Email != ""
+		user.Language, _ = language.Parse(langTag)
 		ctx = context.WithValue(ctx, ContextUserKey, user)
 
 		next.ServeHTTP(w, r.WithContext(ctx))

pkg/profile.go

@@ -42,6 +42,8 @@ func ProfileHandler() http.Handler {
 			page.PasswordConfirm = r.FormValue("password_confirm")
 			page.Language = r.FormValue("language")
 			conn.MustExec(r.Context(), "update user_profile set name = $1, email = $2, lang_tag = $3", page.Name, page.Email, page.Language)
+			http.Redirect(w, r, "/profile", http.StatusSeeOther);
+			return;
 		} else {
 			if err := conn.QueryRow(r.Context(), "select name, lang_tag from user_profile").Scan(&page.Name, &page.Language); err != nil {
 				panic(nil)

revert/available_languages.sql

@@ -2,6 +2,6 @@
 
 begin;
 
-delete from numerus.language;
+delete from public.language;
 
 commit;

sqitch.plan

@@ -16,8 +16,8 @@ encrypt_password [schema_auth user extension_pgcrypto] 2023-01-13T00:14:30Z jord
 login_attempt [schema_auth] 2023-01-17T14:05:49Z jordi fita mas <jordi@tandem.blog> # Add table to log login attempts
 login [roles schema_numerus schema_auth extension_pgcrypto email user login_attempt] 2023-01-13T00:32:32Z jordi fita mas <jordi@tandem.blog> # Add function to login
 check_cookie [schema_public user] 2023-01-17T17:48:49Z jordi fita mas <jordi@tandem.blog> # Add function to check if a user cookie is valid
-logout [schema_auth user] 2023-01-17T19:10:21Z jordi fita mas <jordi@tandem.blog> # Add function to logout
-set_cookie [schema_public check_cookie] 2023-01-19T11:00:22Z jordi fita mas <jordi@tandem.blog> # Add function to set the role based on the cookie
 current_app_user [schema_numerus] 2023-01-21T20:16:28Z jordi fita mas <jordi@tandem.blog> # Add function to get the ID of the current Numerus’ user
+logout [schema_auth current_app_user user] 2023-01-17T19:10:21Z jordi fita mas <jordi@tandem.blog> # Add function to logout
+set_cookie [schema_public check_cookie] 2023-01-19T11:00:22Z jordi fita mas <jordi@tandem.blog> # Add function to set the role based on the cookie
 available_languages [schema_numerus language] 2023-01-21T21:11:08Z jordi fita mas <jordi@tandem.blog> # Add the initial available languages
 user_profile [schema_numerus user current_app_user] 2023-01-21T23:18:20Z jordi fita mas <jordi@tandem.blog> # Add view for user profile

test/email.sql

@@ -12,7 +12,7 @@ set search_path to numerus, public;
 select has_domain('email');
 select domain_type_is('email', 'citext');
 
-select lives_ok($$ SELECT 'test@tandem.com'::email $$, 'Should be able to cast strings to email');
+select lives_ok($$ select 'test@tandem.com'::email $$, 'Should be able to cast strings to email');
 
 select throws_ok(
 	$$ SELECT 'test@tandem,,co.uk'::email $$,

test/user_profile.sql

@@ -10,42 +10,42 @@ select plan(47);
 set search_path to numerus, auth, public;
 
 select has_view('user_profile');
-select table_privs_are('user_profile', 'guest', array []::text[]);
+select table_privs_are('user_profile', 'guest', array ['SELECT']);
 select table_privs_are('user_profile', 'invoicer', array['SELECT']);
 select table_privs_are('user_profile', 'admin', array['SELECT']);
 select table_privs_are('user_profile', 'authenticator', array[]::text[]);
 
 select has_column('user_profile', 'user_id');
 select col_type_is('user_profile', 'user_id', 'integer');
-select column_privs_are('user_profile', 'user_id', 'guest', array []::text[]);
+select column_privs_are('user_profile', 'user_id', 'guest', array ['SELECT']);
 select column_privs_are('user_profile', 'user_id', 'invoicer', array['SELECT']);
 select column_privs_are('user_profile', 'user_id', 'admin', array['SELECT']);
 select column_privs_are('user_profile', 'user_id', 'authenticator', array[]::text[]);
 
 select has_column('user_profile', 'email');
 select col_type_is('user_profile', 'email', 'email');
-select column_privs_are('user_profile', 'email', 'guest', array []::text[]);
+select column_privs_are('user_profile', 'email', 'guest', array ['SELECT']);
 select column_privs_are('user_profile', 'email', 'invoicer', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'email', 'admin', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'email', 'authenticator', array[]::text[]);
 
 select has_column('user_profile', 'name');
 select col_type_is('user_profile', 'name', 'text');
-select column_privs_are('user_profile', 'name', 'guest', array []::text[]);
+select column_privs_are('user_profile', 'name', 'guest', array ['SELECT']);
 select column_privs_are('user_profile', 'name', 'invoicer', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'name', 'admin', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'name', 'authenticator', array[]::text[]);
 
 select has_column('user_profile', 'role');
 select col_type_is('user_profile', 'role', 'name');
-select column_privs_are('user_profile', 'role', 'guest', array []::text[]);
+select column_privs_are('user_profile', 'role', 'guest', array ['SELECT']);
 select column_privs_are('user_profile', 'role', 'invoicer', array['SELECT']);
 select column_privs_are('user_profile', 'role', 'admin', array['SELECT']);
 select column_privs_are('user_profile', 'role', 'authenticator', array[]::text[]);
 
 select has_column('user_profile', 'lang_tag');
 select col_type_is('user_profile', 'lang_tag', 'text');
-select column_privs_are('user_profile', 'lang_tag', 'guest', array []::text[]);
+select column_privs_are('user_profile', 'lang_tag', 'guest', array ['SELECT']);
 select column_privs_are('user_profile', 'lang_tag', 'invoicer', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'lang_tag', 'admin', array['SELECT', 'UPDATE']);
 select column_privs_are('user_profile', 'lang_tag', 'authenticator', array[]::text[]);
@@ -58,13 +58,20 @@ reset client_min_messages;
 insert into auth."user" (user_id, email, name, password, role, cookie, cookie_expires_at, lang_tag)
 values (1, 'demo@tandem.blog', 'Demo', 'test', 'invoicer', '44facbb30d8a419dfd4bfbc44a4b5539d4970148dfc84bed0e', current_timestamp + interval '1 month', 'ca')
      , (5, 'admin@tandem.blog', 'Admin', 'test', 'admin', '12af4c88b528c2ad4222e3740496ecbc58e76e26f087657524', current_timestamp + interval '1 month', 'es')
+     , (7, 'another@tandem.blog', 'Another Admin', 'test', 'admin', default, default, default)
 ;
 
 prepare profile as
 select user_id, email, name, role, lang_tag
 from user_profile;
 
-select is_empty( 'profile', 'Should be empty when no user is logger in' );
+select set_config('request.user.cookie', '', false);
+
+select results_eq(
+	'profile',
+	$$ values (0, null::email, '', 'guest'::name, 'und') $$,
+	'Should be set up with the guest user when no user logged in yet.'
+);
 
 select set_cookie( '44facbb30d8a419dfd4bfbc44a4b5539d4970148dfc84bed0e/demo@tandem.blog' );
 
@@ -144,6 +151,7 @@ select results_eq(
 	$$ select user_id, email, name, lang_tag from auth."user" order by user_id $$,
 	$$ values (1, 'demo+update@tandem.blog'::email, 'Demo Update', 'es')
 	        , (5, 'admin+update@tandem.blog'::email, 'Admin Update', 'ca')
+	        , (7, 'another@tandem.blog'::email, 'Another Admin', 'und')
 	$$,
 	'Should have updated the base table’s data'
 );