add(ui): ability to log out

crates/core/src/model/permissions.rs

@@ -0,0 +1,123 @@
+use bitflags::bitflags;
+use serde::{
+    Deserialize, Deserializer, Serialize,
+    de::{Error as DeError, Visitor},
+};
+
+bitflags! {
+    /// Fine-grained permissions built using bitwise operations.
+    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    pub struct FinePermission: u32 {
+        const DEFAULT = 1 << 0;
+        const ADMINISTRATOR = 1 << 1;
+        const MANAGE_JOURNAL_PAGES = 1 << 2;
+        const MANAGE_JOURNAL_ENTRIES = 1 << 3;
+        const MANAGE_JOURNAL_ENTRY_COMMENTS = 1 << 4;
+        const MANAGE_USERS = 1 << 5;
+        const MANAGE_BANS = 1 << 6; // includes managing IP bans
+        const MANAGE_WARNINGS = 1 << 7;
+        const MANAGE_NOTIFICATIONS = 1 << 8;
+        const VIEW_REPORTS = 1 << 9;
+        const VIEW_AUDIT_LOG = 1 << 10;
+
+        const _ = !0;
+    }
+}
+
+impl Serialize for FinePermission {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_u32(self.bits())
+    }
+}
+
+struct FinePermissionVisitor;
+impl<'de> Visitor<'de> for FinePermissionVisitor {
+    type Value = FinePermission;
+
+    fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+        formatter.write_str("u32")
+    }
+
+    fn visit_u32<E>(self, value: u32) -> Result<Self::Value, E>
+    where
+        E: DeError,
+    {
+        if let Some(permission) = FinePermission::from_bits(value) {
+            Ok(permission)
+        } else {
+            Ok(FinePermission::from_bits_retain(value))
+        }
+    }
+
+    fn visit_i32<E>(self, value: i32) -> Result<Self::Value, E>
+    where
+        E: DeError,
+    {
+        if let Some(permission) = FinePermission::from_bits(value as u32) {
+            Ok(permission)
+        } else {
+            Ok(FinePermission::from_bits_retain(value as u32))
+        }
+    }
+
+    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+    where
+        E: DeError,
+    {
+        if let Some(permission) = FinePermission::from_bits(value as u32) {
+            Ok(permission)
+        } else {
+            Ok(FinePermission::from_bits_retain(value as u32))
+        }
+    }
+}
+
+impl<'de> Deserialize<'de> for FinePermission {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_any(FinePermissionVisitor)
+    }
+}
+
+impl FinePermission {
+    /// Join two [`FinePermission`]s into a single `u32`.
+    pub fn join(lhs: FinePermission, rhs: FinePermission) -> FinePermission {
+        lhs | rhs
+    }
+
+    /// Check if the given `input` contains the given [`FinePermission`].
+    pub fn check(self, permission: FinePermission) -> bool {
+        if (self & FinePermission::ADMINISTRATOR) == FinePermission::ADMINISTRATOR {
+            // has administrator permission, meaning everything else is automatically true
+            return true;
+        }
+
+        (self & permission) == permission
+    }
+
+    /// Check if thhe given [`FinePermission`] is qualifies as "Helper" status.
+    pub fn check_helper(self) -> bool {
+        self.check(FinePermission::MANAGE_JOURNAL_ENTRIES)
+            && self.check(FinePermission::MANAGE_JOURNAL_PAGES)
+            && self.check(FinePermission::MANAGE_JOURNAL_ENTRY_COMMENTS)
+            && self.check(FinePermission::MANAGE_WARNINGS)
+            && self.check(FinePermission::VIEW_REPORTS)
+            && self.check(FinePermission::VIEW_AUDIT_LOG)
+    }
+
+    /// Check if thhe given [`FinePermission`] is qualifies as "Manager" status.
+    pub fn check_manager(self) -> bool {
+        self.check_helper() && self.check(FinePermission::ADMINISTRATOR)
+    }
+}
+
+impl Default for FinePermission {
+    fn default() -> Self {
+        Self::DEFAULT
+    }
+}