added utils

src/utils/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+    schematized: require("./schematized"),
+}

src/utils/schematized/index.js

@@ -0,0 +1,58 @@
+module.exports = (schema = {}, fn) => {
+    return async (req, res, next) => {
+        if (typeof req.body === "undefined") {
+            req.body = {}
+        }
+
+        if (typeof req.query === "undefined") {
+            req.query = {}
+        }
+
+        if (schema.required) {
+            if (Array.isArray(schema.required)) {
+                const missingKeys = []
+                const requiredKeys = Array.isArray(schema.required) ? schema.required : []
+
+                for await (let key of requiredKeys) {
+                    if (typeof req.body[key] === "undefined" && typeof req.query[key] === "undefined") {
+                        req.selection[key] = req.body[key]
+                        continue
+                    }
+                }
+
+                if (missingKeys.length > 0) {
+                    return res.status(400).json({ error: `Missing ${missingKeys}` })
+                }
+            } else {
+                console.warn("[INVALID SCHEMA] schema.required is defined but is not an array")
+            }
+        }
+
+        if (schema.select) {
+            if (Array.isArray(schema.select)) {
+                if (typeof req.selection !== "object") {
+                    req.selection = {}
+                }
+
+                // assign objects along request body and query.
+                for await (let key of schema.select) {
+                    if (req.body && typeof req.body[key] !== "undefined") {
+                        req.selection[key] = req.body[key]
+                        continue
+                    }
+
+                    if (req.query && typeof req.query[key] !== "undefined") {
+                        req.selection[key] = req.query[key]
+                        continue
+                    }
+                }
+            } else {
+                console.warn("[INVALID SCHEMA] schema.select is defined but is not an array")
+            }
+        }
+
+        if (typeof fn === "function") {
+            return await fn(req, res, next)
+        }
+    }
+}