Update cookie management a bit

Update to latest rocket_csrf
Make user_id a samesite lax cookie (see https://github.com/Plume-org/Plume/issues/233#issuecomment-422660275)

Cargo.lock

@@ -1485,7 +1485,7 @@ dependencies = [
  "rocket 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)",
  "rocket_codegen 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)",
  "rocket_contrib 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)",
- "rocket_csrf 0.1.0 (git+https://github.com/fdb-hiroshima/rocket_csrf?rev=5d23ba4c6c2ee4c41040d428d24344db3d29997f)",
+ "rocket_csrf 0.1.0 (git+https://github.com/fdb-hiroshima/rocket_csrf?rev=b326a9893a1849c9abdb39cab9fd7c4a52eb9674)",
  "rocket_i18n 0.1.1 (git+https://github.com/BaptisteGelez/rocket_i18n?rev=75a3bfd7b847324c078a355a7f101f8241a9f59b)",
  "rpassword 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.77 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1861,7 +1861,7 @@ dependencies = [
 [[package]]
 name = "rocket_csrf"
 version = "0.1.0"
-source = "git+https://github.com/fdb-hiroshima/rocket_csrf?rev=5d23ba4c6c2ee4c41040d428d24344db3d29997f#5d23ba4c6c2ee4c41040d428d24344db3d29997f"
+source = "git+https://github.com/fdb-hiroshima/rocket_csrf?rev=b326a9893a1849c9abdb39cab9fd7c4a52eb9674#b326a9893a1849c9abdb39cab9fd7c4a52eb9674"
 dependencies = [
  "csrf 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "data-encoding 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2963,7 +2963,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rocket_codegen 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)" = "<none>"
 "checksum rocket_codegen_next 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)" = "<none>"
 "checksum rocket_contrib 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)" = "<none>"
-"checksum rocket_csrf 0.1.0 (git+https://github.com/fdb-hiroshima/rocket_csrf?rev=5d23ba4c6c2ee4c41040d428d24344db3d29997f)" = "<none>"
+"checksum rocket_csrf 0.1.0 (git+https://github.com/fdb-hiroshima/rocket_csrf?rev=b326a9893a1849c9abdb39cab9fd7c4a52eb9674)" = "<none>"
 "checksum rocket_http 0.4.0-dev (git+https://github.com/SergioBenitez/Rocket?rev=55459db7732b9a240826a5c120c650f87e3372ce)" = "<none>"
 "checksum rocket_i18n 0.1.1 (git+https://github.com/BaptisteGelez/rocket_i18n?rev=75a3bfd7b847324c078a355a7f101f8241a9f59b)" = "<none>"
 "checksum rpassword 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d127299b02abda51634f14025aec43ae87a7aa7a95202b6a868ec852607d1451"

Cargo.toml

@@ -56,7 +56,7 @@ rev = "55459db7732b9a240826a5c120c650f87e3372ce"
 
 [dependencies.rocket_csrf]
 git = "https://github.com/fdb-hiroshima/rocket_csrf"
-rev = "5d23ba4c6c2ee4c41040d428d24344db3d29997f"
+rev = "b326a9893a1849c9abdb39cab9fd7c4a52eb9674"
 
 [dependencies.rocket_i18n]
 git = "https://github.com/BaptisteGelez/rocket_i18n"

src/main.rs

@@ -165,7 +165,7 @@ fn main() {
                 .add_exceptions(vec![
                     ("/inbox".to_owned(), "/inbox".to_owned(), rocket::http::Method::Post),
                     ("/@/<name>/inbox".to_owned(), "/@/<name>/inbox".to_owned(), rocket::http::Method::Post),
-                    ("/~/<blog>/<slug>".to_owned(), "/~/<blog>/<slug>".to_owned(), rocket::http::Method::Post),
+                    ("/login".to_owned(), "/login".to_owned(), rocket::http::Method::Post),
                 ])
                 .finalize().unwrap())
         .launch();

src/routes/session.rs

@@ -1,5 +1,5 @@
 use rocket::{
-    http::{Cookie, Cookies, uri::Uri},
+    http::{Cookie, Cookies, SameSite, uri::Uri},
     response::Redirect,
     request::{LenientForm,FlashMessage}
 };
@@ -72,7 +72,9 @@ fn create(conn: DbConn, data: LenientForm<LoginForm>, flash: Option<FlashMessage
     }
 
     if errors.is_empty() {
-        cookies.add_private(Cookie::new(AUTH_COOKIE, user.unwrap().id.to_string()));
+        cookies.add_private(Cookie::build(AUTH_COOKIE, user.unwrap().id.to_string())
+                                            .same_site(SameSite::Lax)
+                                            .finish());
 
         let destination = flash
             .and_then(|f| if f.name() == "callback" {