upload attachment

src/app/utils/zod.ts

@@ -0,0 +1,50 @@
+import { z } from 'zod';
+
+/**
+ * Regular expression to validate a data URL.
+ * The pattern matches data URLs that start with `data:`, optionally followed by a media type,
+ * optionally followed by an encoding (e.g., `base64`), and ending with base64 encoded data.
+ */
+export const zodDataUrlRegex = /^data:(?:[\w+\/-]+)?(?:[\w+\/-]+)?;base64,[\s\S]*$/;
+
+/**
+ * Zod schema for validating data URLs.
+ * This schema ensures that the input string matches the format of a data URL.
+ *
+ * @example
+ * const result = dataUrlSchema.safeParse('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDCAAAAC0BEMAAW9R3AAAAAElFTkSuQmCC');
+ * if (result.success) {
+ *   console.log('Valid data URL:', result.data);
+ * } else {
+ *   console.error('Validation error:', result.error.errors);
+ * }
+ */
+export const zodDataUrlSchema = z.string().refine(value => zodDataUrlRegex.test(value), {
+  message: 'Invalid data URL',
+});
+
+/**
+ * Validates if a string is a valid data URL.
+ *
+ * @param url - The string to validate as a data URL.
+ * @returns {void} - Logs the result of the validation.
+ *
+ * @example
+ * validateDataUrl('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDCAAAAC0BEMAAW9R3AAAAAElFTkSuQmCC');
+ * // Output: Valid data URL: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDCAAAAC0BEMAAW9R3AAAAAElFTkSuQmCC
+ * 
+ * validateDataUrl('invalid-url');
+ * // Output: Validation error: [ ... ]
+ */
+const validateDataUrl = (url: string) => {
+  const result: any = zodDataUrlSchema.safeParse(url);
+  if (result.success) {
+    console.log('Valid data URL:', url);
+  } else {
+    console.error('Validation error:', result.error.errors);
+  }
+};
+
+// Test the schema
+validateDataUrl('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDCAAAAC0BEMAAW9R3AAAAAElFTkSuQmCC');
+validateDataUrl('invalid-url');