mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:59:27 +08:00
279 lines
10 KiB
Go
279 lines
10 KiB
Go
// 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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package ofdgo
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import (
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"bytes"
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"context"
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"encoding/xml"
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"fmt"
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"maps"
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"strconv"
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"github.com/xiaoqidun/pdfgo"
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)
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// appearanceAnnotation 将PDF静态外观转换为对应类型的OFD注解
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// 入参: ctx 取消上下文, page PDF页面, annotation PDF注解, actions 外观区域的动作
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// 返回: error 外观或转换错误
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func (p *pdfImporter) appearanceAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, actions ...Action) error {
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return p.paintedAnnotation(ctx, page, annotation, nil, actions...)
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}
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// 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
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// 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
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// 返回: error 外观或转换错误
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func (p *pdfImporter) paintedAnnotation(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, paint func(*pdfImporter) error, actions ...Action) error {
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for _, key := range []pdfgo.Name{"AA", "OC", "A"} {
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if annotation.Subtype == "Widget" && (key == "A" || key == "AA") {
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continue
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}
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if key == "A" && (annotation.Subtype == "Link" || annotation.Subtype == "Movie") {
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continue
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}
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value, err := p.reader.Resolve(annotation.Dictionary[key])
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if err != nil {
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return err
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}
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if value != nil {
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return &pdfgo.UnsupportedError{Feature: fmt.Sprintf("annotation field %q", key)}
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}
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}
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remark, err := p.reader.ReadAnnotationText(annotation, "Contents", p.warning)
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if err != nil {
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return err
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}
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if annotation.Subtype == "FreeText" || annotation.Subtype == "Line" {
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annotation.Dictionary = maps.Clone(annotation.Dictionary)
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annotation.Dictionary["Contents"] = pdfgo.String("\xef\xbb\xbf" + remark)
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}
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flags, err := p.reader.ReadAnnotationFlags(annotation)
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if err != nil {
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return err
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}
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invisible := flags&1 != 0 && !annotation.IsStandard()
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if flags&256 != 0 {
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return &pdfgo.UnsupportedError{Feature: "annotation ToggleNoView flag"}
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}
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box := pdfBounds([]pdfgo.Point{
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p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMin, Y: annotation.Rect.YMin}),
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p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMax, Y: annotation.Rect.YMin}),
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p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMax, Y: annotation.Rect.YMax}),
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p.matrix.Apply(pdfgo.Point{X: annotation.Rect.XMin, Y: annotation.Rect.YMax}),
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})
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stamp := *p
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stamp.matrix = (pdfgo.Matrix{1, 0, 0, 1, -box.X, -box.Y}).Mul(p.matrix)
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stamp.objects = nil
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stamp.pendingPath = nil
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stamp.report = PDFImportReport{}
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stamp.compositeCache = nil
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stamp.clipTexts = make(map[*pdfgo.TextClip][]TextObject)
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stamp.pageWidth, stamp.pageHeight = box.W, box.H
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if paint != nil {
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if err := paint(&stamp); err != nil {
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return err
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}
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} else {
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nodes, err := p.collectCompositeNodes(func(visitor pdfgo.Visitor) error {
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if annotation.Subtype == "Widget" {
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visitor.MarkedContent = func(mark pdfgo.MarkedContentMark) error {
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if mark.Tag == "Tx" && len(mark.Properties) == 0 {
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return nil
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}
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if mark.Operator == "EMC" {
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return nil
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}
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if p.warning == nil {
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return &pdfgo.UnsupportedError{Feature: "widget marked content " + string(mark.Tag)}
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}
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p.warning(pdfgo.Diagnostic{Message: "PDF widget marked content " + string(mark.Tag) + " not preserved"})
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return nil
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}
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}
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return p.reader.WalkAnnotationAppearance(ctx, page, annotation, visitor)
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})
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if err != nil {
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return err
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}
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if err := stamp.compositeObjects(nodes); err != nil {
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return err
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}
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}
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if flags&(2|32) == 0 && !invisible {
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p.compositeNodes = stamp.compositeNodes
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p.transferBackdrop = stamp.transferBackdrop
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}
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objects, err := stamp.objects.data(ctx)
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if err != nil {
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return err
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}
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converted := Annotation{Type: pdfAnnotationType(annotation.Subtype), Subtype: string(annotation.Subtype), Remark: remark, Appearance: Appearance{Boundary: pdfBoundary(box), Objects: objects}}
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if annotation.Subtype == "Redact" {
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converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{{Name: "PDF.Redact.Pending", Value: "true"}}}
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}
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if annotation.Subtype == "Text" {
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value, err := p.reader.Resolve(annotation.Dictionary["Open"])
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if err != nil {
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return err
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}
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converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{{Name: "PDF.Text.Open", Value: strconv.FormatBool(value == pdfgo.Boolean(true))}}}
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}
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popupObject, err := p.reader.Resolve(annotation.Dictionary["Popup"])
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if err != nil {
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return err
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}
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if annotation.Subtype == "Popup" {
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popupObject = annotation.Dictionary
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}
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if popupObject != nil {
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popup, err := p.reader.ReadPopupAnnotation(popupObject)
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if err != nil {
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return err
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}
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if converted.Parameters == nil {
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converted.Parameters = &AnnotationParameters{}
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}
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converted.Parameters.Parameter = append(converted.Parameters.Parameter, []AnnotationParameter{
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{Name: "PDF.Popup.Open", Value: strconv.FormatBool(popup.Open)},
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{Name: "PDF.Popup.Rect", Value: fmt.Sprintf("%g %g %g %g", popup.Rect.XMin, popup.Rect.YMin, popup.Rect.XMax, popup.Rect.YMax)},
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}...)
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}
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if len(actions) != 0 {
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region, err := NewShape(ShapeRectangle, Box{W: box.W, H: box.H})
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if err != nil {
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return err
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}
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no := false
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region.Fill, region.Stroke, region.Actions = &no, &no, actions
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converted.Appearance.Objects = append(converted.Appearance.Objects, GraphicObject{Type: "PathObject", PathObject: region})
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}
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if flags&(2|32) != 0 || invisible {
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visible := false
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converted.Visible = &visible
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}
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converted.NoZoom = flags&8 != 0 || annotation.Subtype == "Text"
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converted.NoRotate = flags&16 != 0 || annotation.Subtype == "Text"
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converted.Creator, err = p.reader.ReadAnnotationText(annotation, "T", p.warning)
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if err != nil {
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return err
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}
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modified, err := p.reader.ReadAnnotationText(annotation, "M", p.warning)
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if err != nil {
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return err
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}
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if modified != "" {
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if date, err := pdfgo.ParseDate(modified); err == nil && date.Year() > 0 {
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converted.LastModDate = date.Format("2006-01-02")
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}
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if converted.Parameters == nil {
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converted.Parameters = &AnnotationParameters{}
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}
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converted.Parameters.Parameter = append(converted.Parameters.Parameter, AnnotationParameter{Name: "PDF.M", Value: modified})
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}
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_, data, err := p.editor.prepareAnnotation(p.page, converted)
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if err != nil {
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return fmt.Errorf("PDF annotation: %w", err)
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}
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p.annotationData = append(p.annotationData, bytes.TrimPrefix(data, []byte(xml.Header))...)
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p.report.TextObjects += stamp.report.TextObjects
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p.report.PathObjects += stamp.report.PathObjects
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p.report.ImageObjects += stamp.report.ImageObjects
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p.report.Warnings = append(p.report.Warnings, stamp.report.Warnings...)
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if flags&64 != 0 {
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p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF annotation read-only flag not transferred"})
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}
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return nil
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}
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// pdfAnnotationType 将具有静态外观的PDF注解类别对应到OFD注解类别
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// 入参: subtype PDF注解类别
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// 返回: string OFD注解类别，空字符串表示需单独处理
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func pdfAnnotationType(subtype pdfgo.Name) string {
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switch subtype {
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case "Stamp":
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return "Stamp"
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case "Watermark":
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return "Watermark"
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case "Highlight", "Underline", "Squiggly", "StrikeOut":
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return "Highlight"
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case "Text", "FreeText", "Line", "Square", "Circle", "Polygon", "PolyLine", "Caret", "Ink", "FileAttachment", "Sound", "Movie", "Screen", "Link", "Popup", "Widget", "PrinterMark", "TrapNet", "3D", "RichMedia", "Redact":
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return "Path"
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}
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if !(pdfgo.Annotation{Subtype: subtype}).IsStandard() {
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return "Path"
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}
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return ""
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}
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// formWidget 将表单当前外观转换为注解并报告交互语义差异
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// 入参: ctx 取消上下文, page PDF页面, annotation 表单控件, strict 严格检查开关
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// 返回: error 外观或转换错误
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func (p *pdfImporter) formWidget(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation, strict bool) error {
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if strict {
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return &pdfgo.UnsupportedError{Feature: "interactive PDF form conversion"}
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}
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value, err := p.reader.Resolve(annotation.Dictionary["F"])
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if err != nil {
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return err
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}
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flags, ok := value.(pdfgo.Integer)
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if value != nil && !ok {
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return fmt.Errorf("invalid PDF widget flags")
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}
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if flags&(1|2|32) != 0 {
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p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "hidden PDF form field not transferred"})
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return nil
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}
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if annotation.Dictionary["OC"] != nil {
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return &pdfgo.UnsupportedError{Feature: "widget viewing behavior"}
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}
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if err := p.appearanceAnnotation(ctx, page, annotation); err != nil {
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return err
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}
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p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF form field appearance imported; interactive behavior not transferred"})
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return nil
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}
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// signatureWidget 转换可见签名外观，不将PDF签名误写成OFD签名
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// 入参: ctx 取消上下文, page PDF页面, annotation 签名控件
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// 返回: error 外观或转换错误
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func (p *pdfImporter) signatureWidget(ctx context.Context, page *pdfgo.Page, annotation pdfgo.Annotation) error {
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if annotation.Dictionary["FT"] != pdfgo.Name("Sig") || annotation.Dictionary["V"] == nil {
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return &pdfgo.UnsupportedError{Feature: "non-signature widget"}
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}
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flags := int64(0)
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if value := annotation.Dictionary["F"]; value != nil {
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resolved, err := p.reader.Resolve(value)
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if err != nil {
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return err
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}
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number, ok := resolved.(pdfgo.Integer)
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if !ok {
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return fmt.Errorf("invalid PDF annotation flags")
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}
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flags = int64(number)
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}
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const invisibleFlags = 1 | 2 | 32
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if flags&invisibleFlags != 0 {
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p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "hidden PDF signature not transferred"})
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return nil
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}
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if err := p.appearanceAnnotation(ctx, page, annotation); err != nil {
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return err
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}
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p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF signature appearance imported; digital signature not transferred"})
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return nil
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}
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