codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

examples/07-fullstack/auth/src/auth.rs

@@ -0,0 +1,144 @@
+use async_trait::async_trait;
+use axum_session_auth::*;
+use axum_session_sqlx::SessionSqlitePool;
+use serde::{Deserialize, Serialize};
+use sqlx::sqlite::SqlitePool;
+use std::collections::HashSet;
+
+pub(crate) type Session =
+    axum_session_auth::AuthSession<User, i64, SessionSqlitePool, sqlx::SqlitePool>;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub(crate) struct User {
+    pub id: i32,
+    pub anonymous: bool,
+    pub username: String,
+    pub permissions: HashSet<String>,
+}
+
+#[derive(sqlx::FromRow, Clone)]
+pub(crate) struct SqlPermissionTokens {
+    pub token: String,
+}
+
+#[async_trait]
+impl Authentication<User, i64, SqlitePool> for User {
+    async fn load_user(userid: i64, pool: Option<&SqlitePool>) -> Result<User, anyhow::Error> {
+        let pool = pool.unwrap();
+
+        User::get_user(userid, pool)
+            .await
+            .ok_or_else(|| anyhow::anyhow!("Could not load user"))
+    }
+
+    fn is_authenticated(&self) -> bool {
+        !self.anonymous
+    }
+
+    fn is_active(&self) -> bool {
+        !self.anonymous
+    }
+
+    fn is_anonymous(&self) -> bool {
+        self.anonymous
+    }
+}
+
+#[async_trait]
+impl HasPermission<SqlitePool> for User {
+    async fn has(&self, perm: &str, _pool: &Option<&SqlitePool>) -> bool {
+        self.permissions.contains(perm)
+    }
+}
+
+impl User {
+    pub async fn get_user(id: i64, pool: &SqlitePool) -> Option<Self> {
+        #[derive(sqlx::FromRow, Clone)]
+        struct SqlUser {
+            id: i32,
+            anonymous: bool,
+            username: String,
+        }
+
+        let sqluser = sqlx::query_as::<_, SqlUser>("SELECT * FROM users WHERE id = $1")
+            .bind(id)
+            .fetch_one(pool)
+            .await
+            .ok()?;
+
+        //lets just get all the tokens the user can use, we will only use the full permissions if modifying them.
+        let sql_user_perms = sqlx::query_as::<_, SqlPermissionTokens>(
+            "SELECT token FROM user_permissions WHERE user_id = $1;",
+        )
+        .bind(id)
+        .fetch_all(pool)
+        .await
+        .ok()?;
+
+        Some(User {
+            id: sqluser.id,
+            anonymous: sqluser.anonymous,
+            username: sqluser.username,
+            permissions: sql_user_perms.into_iter().map(|x| x.token).collect(),
+        })
+    }
+
+    pub async fn create_user_tables(pool: &SqlitePool) -> Result<(), sqlx::Error> {
+        sqlx::query(
+            r#"
+                CREATE TABLE IF NOT EXISTS users (
+                    "id" INTEGER PRIMARY KEY,
+                    "anonymous" BOOLEAN NOT NULL,
+                    "username" VARCHAR(256) NOT NULL
+                )
+            "#,
+        )
+        .execute(pool)
+        .await?;
+
+        sqlx::query(
+            r#"
+                CREATE TABLE IF NOT EXISTS user_permissions (
+                    "user_id" INTEGER NOT NULL,
+                    "token" VARCHAR(256) NOT NULL
+                )"#,
+        )
+        .execute(pool)
+        .await?;
+
+        sqlx::query(
+            r#"
+                INSERT INTO users
+                    (id, anonymous, username) SELECT 1, true, 'Guest'
+                ON CONFLICT(id) DO UPDATE SET
+                    anonymous = EXCLUDED.anonymous,
+                    username = EXCLUDED.username
+            "#,
+        )
+        .execute(pool)
+        .await?;
+
+        sqlx::query(
+            r#"
+                INSERT INTO users
+                    (id, anonymous, username) SELECT 2, false, 'Test'
+                ON CONFLICT(id) DO UPDATE SET
+                    anonymous = EXCLUDED.anonymous,
+                    username = EXCLUDED.username
+            "#,
+        )
+        .execute(pool)
+        .await?;
+
+        sqlx::query(
+            r#"
+                INSERT INTO user_permissions
+                    (user_id, token) SELECT 2, 'Category::View'
+            "#,
+        )
+        .execute(pool)
+        .await?;
+
+        Ok(())
+    }
+}