mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:44:23 +08:00
416 lines
14 KiB
Go
416 lines
14 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ofdgo
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"encoding/xml"
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"strconv"
|
|
|
|
codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
|
|
"github.com/xiaoqidun/pdfgo"
|
|
)
|
|
|
|
// pdfDestinationFontBackend 禁止内容度量忽略实际绘制所需的缺失字体
|
|
type pdfDestinationFontBackend struct {
|
|
FontBackend
|
|
}
|
|
|
|
// documentOpenActions 转换文档初始目标与打开动作，不执行脚本或打开资源
|
|
// 入参: ctx 取消上下文
|
|
// 返回: error 动作、编码或取消错误
|
|
func (p *pdfImporter) documentOpenActions(ctx context.Context) error {
|
|
opened, err := p.reader.ReadOpenAction(ctx)
|
|
if err != nil {
|
|
if p.warning == nil || !errors.Is(err, pdfgo.ErrInvalidDestination) {
|
|
return err
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("invalid PDF initial destination ignored: %v", err)})
|
|
}
|
|
var object pdfgo.Object
|
|
if opened.Action != nil {
|
|
object = opened.Action
|
|
}
|
|
if dest := opened.Destination; dest != nil {
|
|
array := append(pdfgo.Array{dest.Page, dest.Mode}, dest.Parameters...)
|
|
object = pdfgo.Dictionary{"S": pdfgo.Name("GoTo"), "D": array}
|
|
}
|
|
currentPage := 0
|
|
actions, err := p.eventActions(ctx, object, "DO", pdfgo.Annotation{}, ¤tPage)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := p.editor.SetDocumentActions(actions); err != nil {
|
|
return err
|
|
}
|
|
triggers, err := p.reader.ReadDocumentTriggers(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, trigger := range triggers {
|
|
if _, err := p.reader.ReadJavaScriptAction(ctx, trigger.Action); err != nil {
|
|
return err
|
|
}
|
|
if err := p.unmappedTrigger(ctx, "document", trigger); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return ctx.Err()
|
|
}
|
|
|
|
// pageOpenActions 将页面打开动作放在注解打开动作之前，关闭事件不改为打开事件
|
|
// 入参: ctx 取消上下文, page PDF页面
|
|
// 返回: error 事件、动作或取消错误
|
|
func (p *pdfImporter) pageOpenActions(ctx context.Context, page *pdfgo.Page) error {
|
|
p.pageActionPage = p.page
|
|
triggers, err := p.reader.ReadPageTriggers(ctx, page)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, trigger := range triggers {
|
|
if trigger.Event != "O" {
|
|
if err := p.unmappedTrigger(ctx, "page", trigger); err != nil {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
actions, err := p.eventActions(ctx, trigger.Action, "PO", pdfgo.Annotation{}, &p.pageActionPage)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := p.editor.SetPageActions(p.page, actions); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return ctx.Err()
|
|
}
|
|
|
|
// eventActions 按原顺序转换动作链，保留事件类型与链内跳转页状态
|
|
// 入参: ctx 取消上下文, object 动作对象, event OFD事件, source 触发注解，零值表示非图元动作, currentPage 当前页面
|
|
// 返回: []Action 转换动作, error 动作或取消错误
|
|
func (p *pdfImporter) eventActions(ctx context.Context, object pdfgo.Object, event string, source pdfgo.Annotation, currentPage *int) ([]Action, error) {
|
|
var actions []Action
|
|
err := p.reader.WalkActions(ctx, object, func(info pdfgo.ActionInfo) error {
|
|
annotation := source
|
|
annotation.Dictionary = pdfgo.Dictionary{"A": info.Dictionary}
|
|
converted, err := p.linkActions(annotation, p.warning == nil, currentPage)
|
|
if err != nil {
|
|
if errors.Is(err, errPDFMediaRead) {
|
|
return err
|
|
}
|
|
var unsupported *pdfgo.UnsupportedError
|
|
if event != "CLICK" && p.warning != nil && errors.Is(err, pdfgo.ErrInvalidAction) {
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("invalid PDF %s action ignored: %v", event, err)})
|
|
return nil
|
|
}
|
|
if event != "CLICK" && p.warning != nil && errors.Is(err, pdfgo.ErrInvalidDestination) {
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("invalid PDF %s destination ignored: %v", event, err)})
|
|
return nil
|
|
}
|
|
if event != "CLICK" && p.warning != nil && errors.As(err, &unsupported) {
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF %s action not transferred to OFD: %s", event, unsupported.Feature)})
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
for _, action := range converted {
|
|
action.Event = event
|
|
actions = append(actions, action)
|
|
}
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return actions, ctx.Err()
|
|
}
|
|
|
|
// unmappedTrigger 校验无法映射的事件链，按导入策略报告而不改变触发条件
|
|
// 入参: ctx 取消上下文, owner 事件归属, trigger PDF事件
|
|
// 返回: error 动作链、取消或严格模式错误
|
|
func (p *pdfImporter) unmappedTrigger(ctx context.Context, owner string, trigger pdfgo.ActionTrigger) error {
|
|
if err := p.reader.WalkActions(ctx, trigger.Action, func(pdfgo.ActionInfo) error { return nil }); err != nil {
|
|
return err
|
|
}
|
|
feature := owner + " trigger " + string(trigger.Event)
|
|
if p.warning == nil {
|
|
return &pdfgo.UnsupportedError{Feature: feature}
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: "PDF " + feature + " not transferred to OFD"})
|
|
return nil
|
|
}
|
|
|
|
// annotationTriggerActions 按事件转换注解动作，页面打开动作独立于注解外观
|
|
// 入参: ctx 取消上下文, annotation PDF注解, event OFD事件
|
|
// 返回: []Action 动作序列, error 事件、动作或取消错误
|
|
func (p *pdfImporter) annotationTriggerActions(ctx context.Context, annotation pdfgo.Annotation, event string) ([]Action, error) {
|
|
if annotation.Subtype == "Widget" && event == "CLICK" {
|
|
return nil, ctx.Err()
|
|
}
|
|
triggers, err := p.reader.ReadAnnotationTriggers(ctx, annotation)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(triggers) == 0 {
|
|
return nil, ctx.Err()
|
|
}
|
|
flags, err := p.reader.ReadAnnotationFlags(annotation)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var converted []Action
|
|
for _, trigger := range triggers {
|
|
if trigger.Event == "PC" || trigger.Event == "PV" || trigger.Event == "PI" {
|
|
if event == "PO" {
|
|
if err := p.unmappedTrigger(ctx, "annotation", trigger); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
continue
|
|
}
|
|
if (trigger.Event == "PO") != (event == "PO") {
|
|
continue
|
|
}
|
|
if flags&64 != 0 && (trigger.Event == "E" || trigger.Event == "X" || trigger.Event == "D" || trigger.Event == "U") {
|
|
continue
|
|
}
|
|
switch trigger.Event {
|
|
case "U", "PO":
|
|
default:
|
|
return nil, &pdfgo.UnsupportedError{Feature: "annotation trigger " + string(trigger.Event)}
|
|
}
|
|
currentPage := p.page
|
|
if event == "PO" {
|
|
currentPage = p.pageActionPage
|
|
}
|
|
var source pdfgo.Annotation
|
|
if event == "CLICK" {
|
|
source = annotation
|
|
}
|
|
actions, err := p.eventActions(ctx, trigger.Action, event, source, ¤tPage)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
converted = append(converted, actions...)
|
|
if event == "PO" {
|
|
p.pageActionPage = currentPage
|
|
}
|
|
}
|
|
if event == "PO" && len(converted) != 0 && (p.page < 0 || p.page >= len(p.editor.pages)) {
|
|
return nil, fmt.Errorf("invalid annotation trigger page")
|
|
}
|
|
return converted, ctx.Err()
|
|
}
|
|
|
|
// ResolveFont 沿用字体匹配，只在实际绘制缺少字体数据时中止度量
|
|
// 入参: renderer 度量渲染器, id 字体标识, exact 是否禁止无关回退
|
|
// 返回: ResolvedFont 字体资源, error 解析或缺失错误
|
|
func (b pdfDestinationFontBackend) ResolveFont(renderer *Renderer, id string, exact bool) (ResolvedFont, error) {
|
|
font, err := b.FontBackend.ResolveFont(renderer, id, exact)
|
|
if err == nil && len(font.Data) == 0 {
|
|
err = fmt.Errorf("PDF destination font %q unavailable", id)
|
|
}
|
|
return font, err
|
|
}
|
|
|
|
// destinationBounds 度量目标页内容并缓存页面内范围，不包含注解或像素取整
|
|
// 入参: page PDF目标页
|
|
// 返回: Box OFD内容范围, error 度量错误
|
|
func (p *pdfImporter) destinationBounds(page *pdfgo.Page) (Box, error) {
|
|
if err := p.ctx.Err(); err != nil {
|
|
return Box{}, err
|
|
}
|
|
if box, ok := p.destinationBoxes[page.Reference]; ok {
|
|
return box, nil
|
|
}
|
|
if index, ok := p.pageIndexes[page.Reference]; ok {
|
|
previous := p.page
|
|
p.page = index
|
|
defer func() { p.page = previous }()
|
|
}
|
|
matrix, width, height := codecpdf.PageMatrix(page)
|
|
editor := NewEditor()
|
|
editor.SetResources(p.resources)
|
|
editor.SetRenderBackends(p.editor.Backends())
|
|
editor.SetFontDirs(p.editor.fontDirs...)
|
|
editor.SetFontFS(p.editor.fontFS...)
|
|
editor.fontSourcesCache = p.renderer.fontSourcesCache
|
|
editor.validatedPaths = p.editor.pathValidationCache()
|
|
if _, err := editor.AddPage(width, height); err != nil {
|
|
return Box{}, err
|
|
}
|
|
local := pdfImporter{
|
|
resources: p.resources,
|
|
ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer,
|
|
matrix: matrix, pageBox: page.CropBox, pageWidth: width, pageHeight: height,
|
|
rasterDPI: p.rasterDPI, fontIDs: make(map[*pdfgo.Font]string),
|
|
resolveFile: p.resolveFile, resolveReference: p.resolveReference,
|
|
references: &codecpdf.ReferenceCache{},
|
|
halftones: p.halftones, halftoneWarnings: make(map[*pdfgo.Halftone]bool),
|
|
}
|
|
defer local.references.Close()
|
|
if err := local.compositePage(nil, func(visitor pdfgo.Visitor) error {
|
|
return p.reader.WalkPage(p.ctx, page, visitor)
|
|
}); err != nil {
|
|
return Box{}, fmt.Errorf("PDF destination content: %w", err)
|
|
}
|
|
if err := local.commitObjects(); err != nil {
|
|
return Box{}, err
|
|
}
|
|
reader, err := editor.resourceReader()
|
|
if err != nil {
|
|
return Box{}, err
|
|
}
|
|
defer reader.Close()
|
|
renderer := p.renderer.childRenderer(reader)
|
|
renderer.TransparentBackground = true
|
|
renderer.RenderAnnotations = false
|
|
if renderer.backends.Fonts != nil {
|
|
renderer.backends.Fonts = pdfDestinationFontBackend{renderer.backends.Fonts}
|
|
}
|
|
scene, err := renderer.CompilePageContext(p.ctx, &editor.pages[0])
|
|
if err != nil {
|
|
return Box{}, err
|
|
}
|
|
if scene == nil {
|
|
return Box{}, fmt.Errorf("PDF destination content scene unavailable")
|
|
}
|
|
geometry, err := renderer.Geometry()
|
|
if err != nil {
|
|
return Box{}, err
|
|
}
|
|
box, err := scene.BoundsContext(p.ctx, geometry)
|
|
if err != nil {
|
|
return Box{}, err
|
|
}
|
|
left, top := math.Max(0, box.X), math.Max(0, box.Y)
|
|
right, bottom := math.Min(width, box.X+box.W), math.Min(height, box.Y+box.H)
|
|
box = Box{X: left, Y: top, W: right - left, H: bottom - top}
|
|
if !finite(left) || !finite(top) || !finite(right) || !finite(bottom) || box.W <= 0 || box.H <= 0 {
|
|
return Box{}, fmt.Errorf("PDF destination content bounds empty or invalid")
|
|
}
|
|
if err := p.ctx.Err(); err != nil {
|
|
return Box{}, err
|
|
}
|
|
if p.destinationBoxes == nil {
|
|
p.destinationBoxes = make(map[pdfgo.Reference]Box)
|
|
}
|
|
p.destinationBoxes[page.Reference] = box
|
|
return box, nil
|
|
}
|
|
|
|
// outlines 按先序批量转换目录，保留层级、展开状态和动作顺序
|
|
// 入参: ctx 取消上下文
|
|
// 返回: error 严格模式转换错误或取消错误
|
|
func (p *pdfImporter) outlines(ctx context.Context) error {
|
|
count := 0
|
|
data, err := encodeOFDXMLContext(ctx, func(x *ofdXML) {
|
|
x.root("Outlines", nil)
|
|
depth := 0
|
|
err := p.reader.WalkOutlines(ctx, func(level int, item pdfgo.OutlineItem) error {
|
|
actions, err := p.outlineActions(ctx, item)
|
|
if err != nil {
|
|
if p.warning == nil || ctx.Err() != nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) || errors.Is(err, errPDFMediaRead) {
|
|
return err
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline %q actions not transferred to OFD: %v", item.Title, err)})
|
|
actions = nil
|
|
}
|
|
for depth > level {
|
|
x.end("OutlineElem")
|
|
depth--
|
|
}
|
|
attrs := ofdAttrs{{Name: xml.Name{Local: "Title"}, Value: item.Title}}
|
|
attrs.add("Expanded", strconv.FormatBool(item.Expanded))
|
|
x.start("OutlineElem", attrs)
|
|
x.actions(actions)
|
|
depth++
|
|
count++
|
|
return x.err
|
|
})
|
|
if err != nil {
|
|
x.err = err
|
|
return
|
|
}
|
|
for depth > 0 {
|
|
x.end("OutlineElem")
|
|
depth--
|
|
}
|
|
x.end("Outlines")
|
|
})
|
|
if err != nil {
|
|
if ctx.Err() != nil {
|
|
return ctx.Err()
|
|
}
|
|
if p.warning == nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) || errors.Is(err, errPDFMediaRead) {
|
|
return err
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outlines not transferred to OFD: %v", err)})
|
|
return nil
|
|
}
|
|
if count > 0 {
|
|
p.editor.outlines = bytes.TrimPrefix(data, []byte(xml.Header))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// outlineActions 转换目录目标及动作链，不为无目标节点补充跳转
|
|
// 入参: ctx 取消上下文, item PDF目录节点
|
|
// 返回: []Action OFD动作序列, error 动作或取消错误
|
|
func (p *pdfImporter) outlineActions(ctx context.Context, item pdfgo.OutlineItem) ([]Action, error) {
|
|
object, err := p.reader.Resolve(item.Action)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
dest, err := p.reader.Resolve(item.Destination)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if dest != nil {
|
|
if object != nil {
|
|
return nil, fmt.Errorf("PDF outline has both destination and action")
|
|
}
|
|
object = pdfgo.Dictionary{"S": pdfgo.Name("GoTo"), "D": dest}
|
|
}
|
|
currentPage := -1
|
|
var actions []Action
|
|
err = p.reader.WalkActions(ctx, object, func(info pdfgo.ActionInfo) error {
|
|
converted, err := p.linkActions(pdfgo.Annotation{Dictionary: pdfgo.Dictionary{"A": info.Dictionary}}, p.warning == nil, ¤tPage)
|
|
if err != nil {
|
|
if errors.Is(err, errPDFMediaRead) {
|
|
return err
|
|
}
|
|
var unsupported *pdfgo.UnsupportedError
|
|
if p.warning != nil && (errors.As(err, &unsupported) || errors.Is(err, pdfgo.ErrInvalidDestination) || errors.Is(err, pdfgo.ErrInvalidAction)) {
|
|
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline action not transferred to OFD: %v", err)})
|
|
currentPage = -1
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
if converted != nil {
|
|
actions = append(actions, converted...)
|
|
} else {
|
|
currentPage = -1
|
|
}
|
|
return nil
|
|
})
|
|
return actions, err
|
|
}
|