Implement Rust-based emote database and REST API

Co-authored-by: Ganonmaster <168445+Ganonmaster@users.noreply.github.com>

src/models.rs

@@ -0,0 +1,53 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Row as stored in the database.
+/// Timestamps are stored as ISO 8601 strings because `sqlx::Any` does not
+/// provide a blanket `Encode`/`Decode` impl for `chrono::DateTime<Utc>`.
+#[derive(Debug, Clone, sqlx::FromRow)]
+pub struct EmoteRow {
+    pub uuid: String,
+    pub name: String,
+    pub alias: Option<String>,
+    pub image_key: String,
+    /// ISO 8601 string, e.g. "2022-02-13T11:27:38.219685+00:00"
+    pub created: String,
+    /// ISO 8601 string
+    pub modified: String,
+}
+
+impl EmoteRow {
+    pub fn created_dt(&self) -> DateTime<Utc> {
+        DateTime::parse_from_rfc3339(&self.created)
+            .map(|dt| dt.with_timezone(&Utc))
+            .unwrap_or_else(|_| Utc::now())
+    }
+
+    pub fn modified_dt(&self) -> DateTime<Utc> {
+        DateTime::parse_from_rfc3339(&self.modified)
+            .map(|dt| dt.with_timezone(&Utc))
+            .unwrap_or_else(|_| Utc::now())
+    }
+}
+
+/// JSON representation returned by the API.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct EmoteResponse {
+    pub name: String,
+    pub url: String,
+    pub created: DateTime<Utc>,
+    pub modified: DateTime<Utc>,
+}
+
+/// Payload for updating an existing emote.
+#[derive(Debug, Deserialize)]
+pub struct UpdateEmoteRequest {
+    pub name: Option<String>,
+    pub alias: Option<String>,
+    pub image_key: Option<String>,
+}
+
+pub fn new_uuid() -> String {
+    Uuid::new_v4().to_string()
+}