增加http、https前缀开头的图片加载

ejsExcel.js

@@ -8,6 +8,7 @@ const Hzip = require("./lib/hzip");
 const xml2json = require("./lib/xml2json");
 const xmldom = require("./lib/xmldom");
 const ejs4xlx = require("./ejs4xlx");
+const {downloadImageToBuffer} = require('./lib/http');
 
 const isType = function (type) {
   return function (obj) {
@@ -442,11 +443,20 @@ async function renderExcel(exlBuf, _data_, opt) {
       return "";
     }
     if (isString(imgPh)) {
-      try {
-        imgBuf = await readFileAsync(imgPh);
-      } catch (error) {
-        err = error;
-        return "";
+      if(imgPh.startsWith('http://') || imgPh.startsWith('https://')){
+        try {
+          imgBuf = await downloadImageToBuffer(imgPh);
+        } catch (error) {
+          err = error;
+          return "";
+        }
+      } else {
+        try {
+          imgBuf = await readFileAsync(imgPh);
+        } catch (error) {
+          err = error;
+          return "";
+        }
       }
       imgBaseName = path.basename(imgPh);
     } else if (Buffer.isBuffer(imgPh)) {

lib/http.js

@@ -0,0 +1,39 @@
+const http = require('http');
+const https = require('https');
+const URL = require('url').URL;
+exports.downloadImageToBuffer = async function (url) {
+  return new Promise((resolve, reject) => {
+    const parsedUrl = new URL(url);
+    const moduleToUse = parsedUrl.protocol === 'https:' ? https : http;
+
+    const request = moduleToUse.get(url, response => {
+      if (response.statusCode !== 200) {
+        reject(new Error(`Failed to get image, status code: ${response.statusCode}`));
+      }
+
+      // 创建一个空的Buffer来累积数据块
+      let chunks = [];
+
+      response.on('data', chunk => {
+        chunks.push(chunk);
+      });
+
+      response.on('end', () => {
+        try {
+          const buffer = Buffer.concat(chunks);
+          resolve(buffer);
+        } catch (error) {
+          reject(error);
+        }
+      });
+
+      response.on('error', error => {
+        reject(error);
+      });
+    });
+
+    request.on('error', error => {
+      reject(error);
+    });
+  });
+}