mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 14:16:55 +08:00
306 lines
12 KiB
Go
306 lines
12 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/json"
|
|
"encoding/xml"
|
|
"fmt"
|
|
"maps"
|
|
"math"
|
|
"strconv"
|
|
|
|
"github.com/xiaoqidun/pdfgo"
|
|
)
|
|
|
|
// appearanceAnnotation 将PDF静态外观转换为对应类型的OFD注解
|
|
// 入参: ctx 取消上下文, page PDF页面, annotation PDF注解, actions 外观区域的动作
|
|
// 返回: error 外观或转换错误
|
|
func (p *pdfImporter) appearanceAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, actions ...Action) error {
|
|
return p.paintedAnnotation(ctx, page, annotation, nil, actions...)
|
|
}
|
|
|
|
// paintedAnnotation 复用注解坐标、标志与元数据处理，允许替换静态绘制内容
|
|
// 入参: ctx 取消上下文, page PDF页面, annotation PDF注解, paint 绘制回调，空值使用原外观, actions 外观区域的动作
|
|
// 返回: error 外观或转换错误
|
|
func (p *pdfImporter) paintedAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, paint func(*pdfImporter) error, actions ...Action) error {
|
|
clicks, err := p.annotationTriggerActions(ctx, annotation, "CLICK")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, key := range []pdfgo.Name{"OC", "A"} {
|
|
if annotation.Subtype == "Widget" && key == "A" {
|
|
continue
|
|
}
|
|
if key == "A" && (annotation.Subtype == "Link" || annotation.Subtype == "Movie") {
|
|
continue
|
|
}
|
|
value, err := p.reader.Resolve(annotation.Dictionary[key])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if value != nil {
|
|
return &pdfgo.UnsupportedError{Feature: fmt.Sprintf("annotation field %q", key)}
|
|
}
|
|
}
|
|
remark, err := p.reader.ReadAnnotationTextContext(ctx, annotation, "Contents", p.warning)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if annotation.Subtype == "FreeText" || annotation.Subtype == "Line" {
|
|
annotation.Dictionary = maps.Clone(annotation.Dictionary)
|
|
annotation.Dictionary["Contents"] = pdfgo.String("\xef\xbb\xbf" + remark)
|
|
}
|
|
flags, err := p.reader.ReadAnnotationFlags(annotation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if flags&64 != 0 && annotation.Subtype != "Widget" {
|
|
actions, clicks = nil, nil
|
|
}
|
|
invisible := flags&1 != 0 && !annotation.IsStandard()
|
|
if flags&256 != 0 {
|
|
return &pdfgo.UnsupportedError{Feature: "annotation ToggleNoView flag"}
|
|
}
|
|
box := pdfBounds([]pdfgo.Point{
|
|
p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMin, Y: annotation.Rect.YMin}),
|
|
p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMax, Y: annotation.Rect.YMin}),
|
|
p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMax, Y: annotation.Rect.YMax}),
|
|
p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMin, Y: annotation.Rect.YMax}),
|
|
})
|
|
if len(clicks) != 0 && annotation.Subtype == "Link" {
|
|
region, err := p.linkRegion(annotation, box)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for i := range clicks {
|
|
clicks[i].Region = region
|
|
}
|
|
}
|
|
actions = append(actions, clicks...)
|
|
playback, err := p.annotationMovieBounds(actions, box, int64(flags))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
source := box
|
|
if playback != source {
|
|
x, y := math.Min(source.X, playback.X), math.Min(source.Y, playback.Y)
|
|
box = Box{X: x, Y: y, W: math.Max(source.X+source.W, playback.X+playback.W) - x, H: math.Max(source.Y+source.H, playback.Y+playback.H) - y}
|
|
}
|
|
stamp := *p
|
|
stamp.matrix = (pdfgo.Matrix{1, 0, 0, 1, -box.X, -box.Y}).Mul(p.matrix)
|
|
stamp.objects = nil
|
|
stamp.pendingPath = nil
|
|
stamp.report = PDFImportReport{}
|
|
stamp.compositeCache = nil
|
|
stamp.clipTexts = make(map[*pdfgo.TextClip][]TextObject)
|
|
stamp.pageWidth, stamp.pageHeight = box.W, box.H
|
|
if paint != nil {
|
|
if err := paint(&stamp); err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
nodes, err := p.collectCompositeNodes(func(visitor pdfgo.Visitor) error {
|
|
return p.reader.WalkAnnotationAppearance(ctx, page, annotation, visitor)
|
|
}, annotation.Subtype == "Widget")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := stamp.compositeObjects(nodes); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if flags&(2|32) == 0 && !invisible {
|
|
p.compositeNodes = stamp.compositeNodes
|
|
p.transferBackdrop = stamp.transferBackdrop
|
|
}
|
|
objects, err := stamp.objects.data(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
converted := Annotation{Type: pdfAnnotationType(annotation.Subtype), Subtype: string(annotation.Subtype), Remark: remark, Appearance: Appearance{Boundary: pdfBoundary(box), Objects: objects}}
|
|
if annotation.Subtype == "Projection" {
|
|
projection, err := p.reader.ReadProjectionAnnotation(annotation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{{Name: "PDF.Projection.Runtime", Value: "unavailable"}}}
|
|
if projection.Measurement != nil {
|
|
data, err := json.Marshal(projection.Measurement)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
converted.Parameters.Parameter = append(converted.Parameters.Parameter, AnnotationParameter{Name: "PDF.Projection.Measurement", Value: string(data)})
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF projection annotation metadata and static appearance retained; runtime rendering not transferred"})
|
|
}
|
|
if annotation.Subtype == "Redact" {
|
|
converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{{Name: "PDF.Redact.Pending", Value: "true"}}}
|
|
}
|
|
if annotation.Subtype == "Text" {
|
|
value, err := p.reader.Resolve(annotation.Dictionary["Open"])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{{Name: "PDF.Text.Open", Value: strconv.FormatBool(value == pdfgo.Boolean(true))}}}
|
|
}
|
|
popupObject, err := p.reader.Resolve(annotation.Dictionary["Popup"])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if annotation.Subtype == "Popup" {
|
|
popupObject = annotation.Dictionary
|
|
}
|
|
if popupObject != nil {
|
|
popup, err := p.reader.ReadPopupAnnotation(popupObject)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if converted.Parameters == nil {
|
|
converted.Parameters = &AnnotationParameters{}
|
|
}
|
|
converted.Parameters.Parameter = append(converted.Parameters.Parameter, []AnnotationParameter{
|
|
{Name: "PDF.Popup.Open", Value: strconv.FormatBool(popup.Open)},
|
|
{Name: "PDF.Popup.Rect", Value: fmt.Sprintf("%g %g %g %g", popup.Rect.XMin, popup.Rect.YMin, popup.Rect.XMax, popup.Rect.YMax)},
|
|
}...)
|
|
}
|
|
if len(actions) != 0 {
|
|
region, err := NewShape(ShapeRectangle, Box{X: playback.X - box.X, Y: playback.Y - box.Y, W: playback.W, H: playback.H})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
no := false
|
|
if playback != source {
|
|
region.CTM = pdfNumbers(1, 0, 0, 1, source.X-playback.X, source.Y-playback.Y)
|
|
for i := range actions {
|
|
if actions[i].Region == nil {
|
|
actions[i].Region = &Region{Area: []RegionArea{{Start: "0 0", Command: []RegionCommand{
|
|
{Type: "Line", Point1: pdfNumbers(source.W, 0)},
|
|
{Type: "Line", Point1: pdfNumbers(source.W, source.H)},
|
|
{Type: "Line", Point1: pdfNumbers(0, source.H)}, {Type: "Close"},
|
|
}}}}
|
|
}
|
|
}
|
|
}
|
|
region.Fill, region.Stroke, region.Actions = &no, &no, actions
|
|
converted.Appearance.Objects = append(converted.Appearance.Objects, GraphicObject{Type: "PathObject", PathObject: region})
|
|
}
|
|
if flags&(2|32) != 0 || invisible {
|
|
visible := false
|
|
converted.Visible = &visible
|
|
}
|
|
converted.NoZoom = flags&8 != 0 || annotation.Subtype == "Text"
|
|
converted.NoRotate = flags&16 != 0 || annotation.Subtype == "Text"
|
|
converted.Creator, err = p.reader.ReadAnnotationTextContext(ctx, annotation, "T", p.warning)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
modified, err := p.reader.ReadAnnotationTextContext(ctx, annotation, "M", p.warning)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if modified != "" {
|
|
if date, err := pdfgo.ParseDate(modified); err == nil && date.Year() > 0 {
|
|
converted.LastModDate = date.Format("2006-01-02")
|
|
}
|
|
if converted.Parameters == nil {
|
|
converted.Parameters = &AnnotationParameters{}
|
|
}
|
|
converted.Parameters.Parameter = append(converted.Parameters.Parameter, AnnotationParameter{Name: "PDF.M", Value: modified})
|
|
}
|
|
_, data, err := p.editor.prepareAnnotation(p.page, converted)
|
|
if err != nil {
|
|
return fmt.Errorf("PDF annotation: %w", err)
|
|
}
|
|
p.annotationData = append(p.annotationData, bytes.TrimPrefix(data, []byte(xml.Header))...)
|
|
if len(actions) != 0 && annotation.Subtype == "Link" || len(clicks) != 0 {
|
|
p.report.Links++
|
|
}
|
|
p.report.TextObjects += stamp.report.TextObjects
|
|
p.report.PathObjects += stamp.report.PathObjects
|
|
p.report.ImageObjects += stamp.report.ImageObjects
|
|
p.report.Warnings = append(p.report.Warnings, stamp.report.Warnings...)
|
|
return nil
|
|
}
|
|
|
|
// pdfAnnotationType 将具有静态外观的PDF注解类别对应到OFD注解类别
|
|
// 入参: subtype PDF注解类别
|
|
// 返回: string OFD注解类别，空字符串表示需单独处理
|
|
func pdfAnnotationType(subtype pdfgo.Name) string {
|
|
switch subtype {
|
|
case "Stamp":
|
|
return "Stamp"
|
|
case "Watermark":
|
|
return "Watermark"
|
|
case "Highlight", "Underline", "Squiggly", "StrikeOut":
|
|
return "Highlight"
|
|
case "Text", "FreeText", "Line", "Square", "Circle", "Polygon", "PolyLine", "Caret", "Ink", "FileAttachment", "Sound", "Movie", "Screen", "Link", "Popup", "Widget", "PrinterMark", "TrapNet", "3D", "RichMedia", "Redact", "Projection":
|
|
return "Path"
|
|
}
|
|
if !(pdfgo.Annotation{Subtype: subtype}).IsStandard() {
|
|
return "Path"
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// formWidget 将表单当前外观转换为注解并报告交互语义差异
|
|
// 入参: ctx 取消上下文, page PDF页面, annotation 表单控件, strict 严格检查开关
|
|
// 返回: error 外观或转换错误
|
|
func (p *pdfImporter) formWidget(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, strict bool) error {
|
|
if strict {
|
|
return &pdfgo.UnsupportedError{Feature: "interactive PDF form conversion"}
|
|
}
|
|
flags, err := p.reader.ReadAnnotationFlags(annotation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if flags&(2|32) != 0 {
|
|
p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "hidden PDF form field not transferred"})
|
|
return nil
|
|
}
|
|
if annotation.Dictionary["OC"] != nil {
|
|
return &pdfgo.UnsupportedError{Feature: "widget viewing behavior"}
|
|
}
|
|
if err := p.appearanceAnnotation(ctx, page, annotation); err != nil {
|
|
return err
|
|
}
|
|
p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF form field appearance imported; interactive behavior not transferred"})
|
|
return nil
|
|
}
|
|
|
|
// signatureWidget 转换可见签名外观，不将PDF签名误写成OFD签名
|
|
// 入参: ctx 取消上下文, page PDF页面, annotation 签名控件
|
|
// 返回: error 外观或转换错误
|
|
func (p *pdfImporter) signatureWidget(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation) error {
|
|
if annotation.Dictionary["FT"] != pdfgo.Name("Sig") || annotation.Dictionary["V"] == nil {
|
|
return &pdfgo.UnsupportedError{Feature: "non-signature widget"}
|
|
}
|
|
flags, err := p.reader.ReadAnnotationFlags(annotation)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if flags&(2|32) != 0 {
|
|
p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "hidden PDF signature not transferred"})
|
|
return nil
|
|
}
|
|
if err := p.appearanceAnnotation(ctx, page, annotation); err != nil {
|
|
return err
|
|
}
|
|
p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF signature appearance imported; digital signature not transferred"})
|
|
return nil
|
|
}
|