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// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build js && wasm
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package webui
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"syscall/js"
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)
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const (
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platformTypeNumber = js.TypeNumber
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platformTypeString = js.TypeString
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platformTypeBoolean = js.TypeBoolean
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platformTypeObject = js.TypeObject
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platformTypeFunction = js.TypeFunction
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)
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// platformValue 浏览器参数值
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type platformValue = js.Value
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// RunWASM 注册浏览器WASM接口并阻塞运行
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func RunWASM() {
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e := &businessEngine{}
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asynchronous := map[string]bool{
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"ofdgoDetectFormat": true,
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"ofdgoExportVersion": true,
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"ofdgoConvertPDF": true,
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"ofdgoConvertFile": true,
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"ofdgoPackFiles": true,
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"ofdgoExportPage": true,
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"ofdgoExportDocument": true,
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"ofdgoExportAttachment": true,
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"ofdgoExportMedia": true,
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"ofdgoResources": true,
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"ofdgoExportResource": true,
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"ofdgoExportImages": true,
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"ofdgoImportImages": true,
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"ofdgoImportPages": true,
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"ofdgoImportDocuments": true,
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"ofdgoSaveDocument": true,
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"ofdgoSetEncryption": true,
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"ofdgoSaveSigned": true,
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}
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for name, callback := range e.businessCommands() {
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if asynchronous[name] {
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registerAsyncCallback(name, callback)
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} else {
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registerCallback(name, callback)
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}
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}
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select {}
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}
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// awaitExport 等待浏览器处理导出检查点
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// 入参: fn 浏览器回调, args 回调参数
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// 返回: error 写入错误或取消原因
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func awaitExport(fn js.Value, args ...any) error {
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done := make(chan error)
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callback := js.FuncOf(func(this js.Value, args []js.Value) any {
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var err error
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if args[1].Bool() {
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err = context.Canceled
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} else if message := args[0].String(); message != "" {
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err = fmt.Errorf("%s", message)
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}
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done <- err
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return nil
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})
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defer callback.Release()
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fn.Invoke(append(args, callback)...)
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return <-done
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}
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// registerCallback 注册浏览器回调函数
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// 入参: name 回调名称, fn 回调函数
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func registerCallback(name string, fn func([]js.Value) (any, error)) {
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cb := js.FuncOf(func(this js.Value, args []js.Value) any {
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return callbackResult(fn, args)
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})
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js.Global().Set(name, cb)
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}
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// registerAsyncCallback 注册异步回调，为浏览器处理数据和取消请求让出事件循环
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// 入参: name 回调名称, fn 回调函数
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func registerAsyncCallback(name string, fn func([]js.Value) (any, error)) {
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cb := js.FuncOf(func(this js.Value, args []js.Value) any {
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executor := js.FuncOf(func(this js.Value, callbacks []js.Value) any {
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resolve := callbacks[0]
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go func() {
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resolve.Invoke(callbackResult(fn, args))
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}()
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return nil
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})
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defer executor.Release()
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return js.Global().Get("Promise").New(executor)
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})
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js.Global().Set(name, cb)
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}
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// callbackResult 转换浏览器接口结果
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// 入参: fn 回调函数, args 回调参数
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// 返回: any 浏览器结果
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func callbackResult(fn func([]js.Value) (any, error), args []js.Value) any {
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data, err := (&businessEngine{}).safeCall(fn, args)
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if err != nil {
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result := failureResult(err)
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return (&businessEngine{}).encodeResult(result)
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}
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if result, ok := data.(js.Value); ok {
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return result
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}
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return (&businessEngine{}).encodeResult(apiResult{OK: true, Data: data})
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}
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// loadConversionFont 按需读取浏览器已授权字体，不预读系统字体目录
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// 入参: load 浏览器读取函数, name 字体文件名
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// 返回: []byte 字体内容, error 读取错误或取消原因
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func (e *businessEngine) loadConversionFont(load js.Value, name string) ([]byte, error) {
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done := make(chan error, 1)
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var data []byte
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callback := js.FuncOf(func(this js.Value, args []js.Value) any {
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var err error
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if args[2].Bool() {
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err = context.Canceled
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} else if message := args[1].String(); message != "" {
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err = fmt.Errorf("%s", message)
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} else {
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data, err = e.bytesFromJS(args[0])
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}
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done <- err
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return nil
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})
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defer callback.Release()
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load.Invoke(name, callback)
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err := <-done
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return data, err
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}
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// successResult 创建成功接口结果
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// 入参: data 返回数据
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// 返回: js.Value 接口结果
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func successResult(data any) js.Value {
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result := js.Global().Get("Object").New()
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result.Set("ok", true)
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result.Set("data", data)
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return result
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}
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// bytesToJS 将字节数据转换为Uint8Array
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// 入参: data 字节数据
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// 返回: js.Value Uint8Array对象
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func bytesToJS(data []byte) js.Value {
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value := js.Global().Get("Uint8Array").New(len(data))
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js.CopyBytesToJS(value, data)
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return value
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}
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// bytesFromJS 从浏览器值读取二进制数据
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// 入参: value 浏览器值
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// 返回: []byte 二进制数据, error 错误信息
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func (e *businessEngine) bytesFromJS(value js.Value) ([]byte, error) {
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if value.IsUndefined() || value.IsNull() {
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return nil, fmt.Errorf("missing binary data")
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}
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uint8Array := js.Global().Get("Uint8Array")
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arrayBuffer := js.Global().Get("ArrayBuffer")
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if value.InstanceOf(arrayBuffer) {
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value = uint8Array.New(value)
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}
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if !value.InstanceOf(uint8Array) {
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return nil, fmt.Errorf("binary data must be Uint8Array or ArrayBuffer")
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}
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data := make([]byte, value.Get("byteLength").Int())
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if n := js.CopyBytesToGo(data, value); n != len(data) {
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return nil, fmt.Errorf("copied %d of %d bytes", n, len(data))
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}
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return data, nil
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}
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// platformValueOf 转换浏览器参数
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func platformValueOf(v any) platformValue { return js.ValueOf(v) }
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// platformNull 返回空参数
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func platformNull() platformValue { return js.Null() }
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// platformCopyBytes 复制浏览器字节
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func platformCopyBytes(dst []byte, src platformValue) int { return js.CopyBytesToGo(dst, src) }
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// platformJSON 编码小参数
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func platformJSON(v platformValue) string {
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return js.Global().Get("JSON").Call("stringify", v).String()
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}
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// platformParseJSON 解析结构参数
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func platformParseJSON(data []byte) map[string]any {
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var result map[string]any
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if err := json.Unmarshal(data, &result); err != nil {
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panic(err)
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}
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return result
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}
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// sourceFromValue 读取浏览器二进制源
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func (e *businessEngine) sourceFromValue(value platformValue) (io.ReaderAt, int64, error) {
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data, err := e.bytesFromJS(value)
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return bytes.NewReader(data), int64(len(data)), err
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}
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