poi/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSignatureLine.java

package org.apache.poi.xssf.usermodel;

import java.io.IOException;
import java.io.OutputStream;

import javax.xml.namespace.QName;

import com.microsoft.schemas.office.excel.CTClientData;
import com.microsoft.schemas.office.excel.STCF;
import com.microsoft.schemas.office.excel.STObjectType;
import com.microsoft.schemas.office.excel.STTrueFalseBlank;
import com.microsoft.schemas.office.office.CTSignatureLine;
import com.microsoft.schemas.vml.CTImageData;
import com.microsoft.schemas.vml.CTShape;
import org.apache.poi.common.usermodel.PictureType;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ooxml.POIXMLException;
import org.apache.poi.ooxml.POIXMLRelation;
import org.apache.poi.ooxml.util.XPathHelper;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.poifs.crypt.dsig.SignatureLine;
import org.apache.poi.schemas.vmldrawing.CTXML;
import org.apache.xmlbeans.XmlException;

public class XSSFSignatureLine extends SignatureLine {
    private static final String MS_VML_URN = "urn:schemas-microsoft-com:vml";

    public void parse(XSSFSheet sheet) throws XmlException {
        XSSFVMLDrawing vml = sheet.getVMLDrawing(false);
        if (vml == null) {
            return;
        }
        CTSignatureLine line = XPathHelper.selectProperty(vml.getDocument(), CTSignatureLine.class, null,
              new QName[]{XSSFVMLDrawing.QNAME_VMLDRAWING},
              new QName[]{new QName(MS_VML_URN, "shape")},
              new QName[]{QNAME_SIGNATURE_LINE});

        if (line != null) {
            setSignatureShape(line);
            parse();
        }
    }

    public void add(XSSFSheet sheet, XSSFClientAnchor anchor) {
        XSSFVMLDrawing vml = sheet.getVMLDrawing(true);
        CTXML root = vml.getDocument().getXml();
        add(root, (image, type) -> addPicture(image,type,sheet));
        CTShape shape = getSignatureShape();
        CTClientData clientData = shape.addNewClientData();
        // LeftColumn, LeftOffset, TopRow, TopOffset, RightColumn, RightOffset, BottomRow, BottomOffset
        String anchorStr =
            anchor.getCol1()+", "+
            anchor.getDx1()+", "+
            anchor.getRow1()+", "+
            anchor.getDy1()+", "+
            anchor.getCol2()+", "+
            anchor.getDx2()+", "+
            anchor.getRow2()+", "+
            anchor.getDy2();
//        anchorStr = "2, 0, 3, 0, 5, 136, 9, 32";
        clientData.addAnchor(anchorStr);
        clientData.setObjectType(STObjectType.PICT);
        clientData.addSizeWithCells(STTrueFalseBlank.X);
        clientData.addCF(STCF.PICT);
        clientData.addAutoPict(STTrueFalseBlank.X);
    }

    @Override
    protected void setRelationId(CTImageData imageData, String relId) {
        imageData.setRelid(relId);
    }

    private String addPicture(byte[] image, PictureType type, XSSFSheet sheet) throws InvalidFormatException {
        XSSFWorkbook wb = sheet.getWorkbook();
        XSSFVMLDrawing vml = sheet.getVMLDrawing(false);
        POIXMLRelation xtype = mapType(type);
        int idx = wb.getNextPartNumber(xtype, -1);
        POIXMLDocumentPart.RelationPart rp = vml.createRelationship(xtype, XSSFFactory.getInstance(), idx, false);
        POIXMLDocumentPart dp = rp.getDocumentPart();
        try (OutputStream out = dp.getPackagePart().getOutputStream()) {
            out.write(image);
        } catch (IOException e) {
            throw new POIXMLException(e);
        }
        return rp.getRelationship().getId();
    }


    private static POIXMLRelation mapType(PictureType type) throws InvalidFormatException {
        switch (type) {
            case BMP:
                return XSSFRelation.IMAGE_BMP;
            case DIB:
                return XSSFRelation.IMAGE_DIB;
            case EMF:
                return XSSFRelation.IMAGE_EMF;
            case EPS:
                return XSSFRelation.IMAGE_EPS;
            case GIF:
                return XSSFRelation.IMAGE_GIF;
            case JPEG:
                return XSSFRelation.IMAGE_JPEG;
            case PICT:
                return XSSFRelation.IMAGE_PICT;
            case PNG:
                return XSSFRelation.IMAGE_PNG;
            case TIFF:
                return XSSFRelation.IMAGE_TIFF;
            case WMF:
                return XSSFRelation.IMAGE_WMF;
            case WPG:
                return XSSFRelation.IMAGE_WPG;
            default:
                throw new InvalidFormatException("Unsupported picture format "+type);
        }
    }
}