新增邮件发送和管理员功能

mail-vue/src/utils/file-utils.js

@@ -1,3 +1,5 @@
+import Compressor from "compressorjs";
+
 export function getExtName(fileName) {
     const index = fileName.lastIndexOf('.')
     return index !== -1 ? fileName.slice(index + 1).toLowerCase() : ''
@@ -10,4 +12,38 @@ export function formatBytes(bytes) {
     const i = Math.floor(Math.log(bytes) / Math.log(k));
     const size = (bytes / Math.pow(k, i)).toFixed(2);
     return `${size} ${units[i]}`;
-}
+}
+
+export function fileToBase64(file) {
+    return new Promise((resolve, reject) => {
+        const reader = new FileReader();
+        reader.readAsDataURL(file);
+        reader.onload = () => {
+            const base64 = reader.result.split(',')[1];
+            resolve(base64);
+        };
+        reader.onerror = reject;
+    });
+}
+
+export function base64Size(base64String) {
+    const padding = (base64String.match(/=*$/) || [''])[0].length;
+    const base64Length = base64String.length;
+    return (base64Length * 3) / 4 - padding;
+}
+
+export function compressImage(file, quality = 0.6) {
+    return new Promise((resolve, reject) => {
+        new Compressor(file, {
+            quality,
+            mimeType: 'image/jpeg',
+            convertSize: 1024 * 1024,
+            success(result) {
+                resolve(result);
+            },
+            error(err) {
+                reject(err);
+            },
+        });
+    });
+}