13

util/index.js

@@ -2,6 +2,7 @@
 //import i18n from '@/locales'
 import base from '@/common/config';
 //import store from "@/store";
+import IMSDK from "openim-uniapp-polyfill";
 const isString = (v)=> {
 	return typeof v === 'string' || v instanceof String;
 },
@@ -222,5 +223,73 @@ export default{
 		v = parseFloat(v).toFixed(wei || 2);
 		return parseFloat(v);
 	},
-	
-}
+    imapi(method,data){
+        return IMSDK.asyncApi(method,IMSDK.uuid(),data);
+    },
+
+	async fileExsit(fn){
+		return await new Promise((resolve) => {
+			plus.io.resolveLocalFileSystemURL(fn, function(entry) { resolve(true); }, function() { resolve(false); });
+		})
+	},
+	downloadFile  (url, savepath, successCb, errorCb, progressCb) {
+		if (!url) {
+			errorCb && errorCb(new Error('empty url'));
+			return;
+		}
+		const startDownload = () => {
+			try {
+				const task = plus.downloader.createDownload(url, { filename: savepath, timeout: 120000 }, function(d, status) {
+					if (status === 200) {
+						const local = d && d.filename ? d.filename : savepath;
+						successCb && successCb(local);
+					} else {
+						errorCb && errorCb(new Error('download status ' + status));
+					}
+				});
+				try {
+					if (task && typeof task.addEventListener === 'function') {
+						task.addEventListener('statechanged', function(t, status) {
+							if (t.state === 3) {
+								var downloaded = t.downloadedSize || t.downloaded || 0;
+								var total = t.totalSize || t.total || 0;
+								var prog = 0;
+								if (total > 0) prog = Math.min(100, Math.floor(downloaded / total * 100));
+								progressCb && progressCb(prog);
+							}
+						});
+					}
+				} catch (e) {
+					// ignore
+				}
+				task.start();
+			} catch (e) {
+				errorCb && errorCb(e);
+			}
+		};
+
+		// 确保父目录存在
+		try {
+			const parent = savepath.substring(0, savepath.lastIndexOf('/'));
+			plus.io.resolveLocalFileSystemURL(parent, function(entry) {
+				startDownload();
+			}, function() {
+				// 目录不存在，尝试创建（针对 _doc/<conversationID> 结构）
+				let rel = parent;
+				if (rel.indexOf('_doc/') === 0) rel = rel.replace(/^_doc\//, '');
+				plus.io.requestFileSystem(plus.io.PRIVATE_DOC, function(fs) {
+					fs.root.getDirectory(rel, { create: true }, function(entry) {
+						startDownload();
+					}, function(e) {
+						// 创建失败也尝试下载，可能运行时会自动创建
+						startDownload();
+					});
+				}, function(e) {
+					startDownload();
+				});
+			});
+		} catch (e) {
+			startDownload();
+		}
+	}
+}