update at 2026-02-08 18:28:39

miniprogram/utils/mp/file-export.js

@@ -0,0 +1,49 @@
+const { writeFile } = require('./wx-promisify')
+
+function sanitizeFilename(filename) {
+  return String(filename || 'font2svg')
+    .replace(/[<>:"/\\|?*\x00-\x1F]/g, '_')
+    .replace(/\s+/g, '_')
+    .slice(0, 80)
+}
+
+function buildFilename(fontName, text, ext) {
+  const safeFont = sanitizeFilename(fontName || 'font')
+  const safeText = sanitizeFilename(Array.from(text || '').slice(0, 8).join('') || 'text')
+  return `${safeFont}_${safeText}.${ext}`
+}
+
+async function writeTextToUserPath(text, ext, preferredName) {
+  const filename = preferredName || `font2svg_${Date.now()}.${ext}`
+  const filePath = `${wx.env.USER_DATA_PATH}/${filename}`
+  await writeFile(filePath, text, 'utf8')
+  return filePath
+}
+
+async function saveSvgToUserPath(svgText, fontName, text) {
+  const filename = buildFilename(fontName, text, 'svg')
+  return writeTextToUserPath(svgText, 'svg', filename)
+}
+
+async function shareLocalFile(filePath, fileName) {
+  if (typeof wx.shareFileMessage !== 'function') {
+    throw new Error('当前微信版本不支持文件分享')
+  }
+
+  return new Promise((resolve, reject) => {
+    wx.shareFileMessage({
+      filePath,
+      fileName,
+      success: resolve,
+      fail: reject,
+    })
+  })
+}
+
+module.exports = {
+  sanitizeFilename,
+  buildFilename,
+  writeTextToUserPath,
+  saveSvgToUserPath,
+  shareLocalFile,
+}