feat(backend/api/get/post/<post_id>) implement api

backend/src/api/get/get_post.rs

@@ -1,12 +1,69 @@
+use std::str::FromStr;
+
 use axum::extract::{Path, State};
 use axum::Json;
-use serde_json::Value;
-use sqlx::PgPool;
+use chrono::NaiveDateTime;
+use serde_json::{json, Map, Value};
+use sqlx::{PgPool, query, Row};
+use uuid::Uuid;
 
 pub async fn get_post(
-    State(_db_connection): State<PgPool>,
+    State(db_connection): State<PgPool>,
     Path(post_id): Path<String>,
 ) -> Result<Json<Value>, Json<Value>> {
-    dbg!(&post_id);
-    todo!()
+    let meta = query(
+        r#"
+SELECT *
+FROM Post
+WHERE post_id = $1;
+    "#,
+    )
+        .bind(Uuid::from_str(post_id.as_str()).expect("Failed to parse UUID"))
+        .fetch_one(&db_connection)
+        .await
+        .expect("Failed to execute db query");
+
+    let tags = query(
+        r#"
+SELECT tag FROM Tag WHERE post_id = $1;
+    "#,
+    )
+        .bind(Uuid::from_str(post_id.as_str()).expect("Failed to parse UUID"))
+        .fetch_all(&db_connection)
+        .await
+        .expect("Failed to execute db query");
+
+    let mut res = Map::new();
+
+    res.insert(
+        "title".to_string(),
+        json!(meta.get::<String, &str>("title")),
+    );
+    res.insert(
+        "summary".to_string(),
+        json!(meta.get::<String, &str>("summary")),
+    );
+    res.insert(
+        "content".to_string(),
+        json!(meta.get::<String, &str>("content")),
+    );
+    res.insert(
+        "last_update".to_string(),
+        json!(meta.get::<NaiveDateTime, &str>("last_update")),
+    );
+    res.insert(
+        "first_update".to_string(),
+        json!(meta.get::<NaiveDateTime, &str>("first_update")),
+    );
+
+    let tags: Vec<String> = tags
+        .iter()
+        .map(|tag| {
+            let tag: String = tag.get("tag");
+            tag
+        })
+        .collect();
+    res.insert("tags".to_string(), Value::from(tags));
+
+    Ok(Json::from(Value::from(res)))
 }