fix: Add additional model validation (#3725)

server/models/validators/Length.ts

@@ -0,0 +1,27 @@
+import { size } from "lodash";
+import { addAttributeOptions } from "sequelize-typescript";
+
+/**
+ * A decorator that validates the size of a string based on lodash's size.
+ * function. Useful for strings with unicode characters of variable lengths.
+ */
+export default function Length({
+  msg,
+  min,
+  max,
+}: {
+  msg?: string;
+  min: number;
+  max: number;
+}): (target: any, propertyName: string) => void {
+  return (target: any, propertyName: string) =>
+    addAttributeOptions(target, propertyName, {
+      validate: {
+        validLength(value: string) {
+          if (size(value) > max || size(value) < min) {
+            throw new Error(msg);
+          }
+        },
+      },
+    });
+}

server/models/validators/NotContainsUrl.ts

@@ -0,0 +1,16 @@
+import { addAttributeOptions } from "sequelize-typescript";
+
+/**
+ * A decorator that validates that a string does not include something that
+ * looks like a URL.
+ */
+export default function NotContainsUrl(target: any, propertyName: string) {
+  return addAttributeOptions(target, propertyName, {
+    validate: {
+      not: {
+        args: /(www|file:|http:|https:)+[^\s]+[\w]/,
+        msg: "Must not contain a URL",
+      },
+    },
+  });
+}