mirror of
https://github.com/OpenSignLabs/OpenSign.git
synced 2026-08-17 21:25:54 +02:00
fix: signature slighty move from top and bottom
This commit is contained in:
prafull-opensignlabs
+22
-22
@@ -1,28 +1,28 @@
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import{DEFAULT_BYTE_RANGE_PLACEHOLDER,DEFAULT_SIGNATURE_LENGTH,SUBFILTER_ADOBE_PKCS7_DETACHED}from"./const.min.js";import PDFKitReferenceMock from"./PDFKitReferenceMock.min.js";import PNG from"png-js";import zlib from"zlib";import fs from"node:fs";const specialCharacters=["á","Á","é","É","í","Í","ó","Ó","ö","Ö","ő","Ő","ú","Ú","ű","Ű"],MARKERS=[65472,65473,65474,65475,65477,65478,65479,65480,65481,65482,65483,65484,65485,65486,65487],COLOR_SPACE_MAP={1:"DeviceGray",3:"DeviceRGB",4:"DeviceCMYK"};function getImage(e,t){let n;if(255===e[0]&&216===e[1])n=getJpgImage(t,e);else{if(137!==e[0]||"PNG"!==e.toString("ascii",1,4))throw new Error("Unknown image format.");n=getPngImage(t,e)}return n}function getAnnotationApparance(e,t,n){return e.ref({CropBox:[0,0,197,70],Type:"XObject",FormType:1,BBox:[0,0,197,70],Resources:`<</XObject <<
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import{DEFAULT_BYTE_RANGE_PLACEHOLDER,DEFAULT_SIGNATURE_LENGTH,SUBFILTER_ADOBE_PKCS7_DETACHED}from"./const.min.js";import PDFKitReferenceMock from"./PDFKitReferenceMock.min.js";import PNG from"png-js";import zlib from"zlib";const specialCharacters=["á","Á","é","É","í","Í","ó","Ó","ö","Ö","ő","Ő","ú","Ú","ű","Ű"],MARKERS=[65472,65473,65474,65475,65477,65478,65479,65480,65481,65482,65483,65484,65485,65486,65487],COLOR_SPACE_MAP={1:"DeviceGray",3:"DeviceRGB",4:"DeviceCMYK"};function getImage(e,t){let n;if(255===e[0]&&216===e[1])n=getJpgImage(t,e);else{if(137!==e[0]||"PNG"!==e.toString("ascii",1,4))throw new Error("Unknown image format.");n=getPngImage(t,e)}return n}function getAnnotationApparance(e,t,n){return e.ref({CropBox:[0,10,200,60],Type:"XObject",FormType:1,BBox:[0,10,200,60],Resources:`<</XObject <<
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/Img${t.index} ${t.index} 0 R
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>>
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/Font <<
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/f1 ${n.index} 0 R
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>>
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>>`,MediaBox:[0,0,197,70],Subtype:"Form"},null,getStream(t.index))}const getStream=e=>getConvertedText(`
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1.0 1.0 1.0 rg
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0.0 0.0 0.0 RG
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q
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q
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200 0 0 50 0 10 cm
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/Img${e} Do
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Q
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0 0 0 rg
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BT
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0 Tr
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/f1 10.0 Tf
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1.4 0 0 1 20 45.97412 Tm
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ET
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BT
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0 Tr
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/f1 10.0 Tf
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1.4 0 0 1 20 33.56006 Tm
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ET
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Q`),getFont=(e,t)=>e.ref({Type:"Font",BaseFont:t,Encoding:"WinAnsiEncoding",Subtype:"Type1"}),getJpgImage=(e,t)=>{if(65496!==t.readUInt16BE(0))throw"SOI not found in JPEG";let n=2,a;for(;n<t.length&&(a=t.readUInt16BE(n),n+=2,!MARKERS.includes(a));)n+=t.readUInt16BE(n);if(!MARKERS.includes(a))throw"Invalid JPEG.";n+=2;var r=t[n++],o=t.readUInt16BE(n),i=(n+=2,t.readUInt16BE(n)),l=(n+=2,t[n++]),l=COLOR_SPACE_MAP[l],r={Type:"XObject",Subtype:"Image",BitsPerComponent:r,Width:i,Height:o,ColorSpace:l,Filter:"DCTDecode"},i=("DeviceCMYK"===l&&(r.Decode=[1,0,1,0,1,0,1,0]),e.ref(r,null,t));return i},getPngImage=(e,t)=>{var t=new PNG(t),n=t.hasAlphaChannel,a={Type:"XObject",Subtype:"Image",BitsPerComponent:n?8:t.bits,Width:t.width,Height:t.height,Filter:"FlateDecode"};if(n||(r=e.ref({Predictor:15,Colors:t.colors,BitsPerComponent:t.bits,Columns:t.width}),a.DecodeParms=r),0===t.palette.length?a.ColorSpace=t.colorSpace:(r=e.ref({stream:new Buffer(t.palette)}),a.ColorSpace=["Indexed","DeviceRGB",t.palette.length/3-1,r]),null!=t.transparency.grayscale){var r=t.transparency.grayscale;a.Mask=[r,r]}else if(t.transparency.rgb){var o,r=t.transparency["rgb"],i=[];for(o of r)i.push(o,o);a.Mask=i}else t.transparency.indexed?loadIndexedAlphaChannel(t):n&&(splitAlphaChannel(t),r=getSmask(e,t),a.Mask=r);return e.ref(a,null,t.imgData)},loadIndexedAlphaChannel=e=>{const o=e.transparency.indexed;return e.decodePixels(n=>{var a=new Buffer(e.width*e.height);let r=0;for(let e=0,t=n.length;e<t;e++)a[r++]=o[n[e]];e.alphaChannel=zlib.deflateSync(a)})},splitAlphaChannel=d=>{d.decodePixels(t=>{let e,n;var a=d.colors,r=d.width*d.height,o=new Buffer(r*a),i=new Buffer(r);let l=n=e=0;for(var g=t.length,c=16===d.bits?1:0;l<g;){for(let e=0;e<a;e++)o[n++]=t[l++],l+=c;i[e++]=t[l++],l+=c}d.imgData=zlib.deflateSync(o),d.alphaChannel=zlib.deflateSync(i)})},getSmask=(e,t)=>{let n;return console.log("image.hasAlphaChannel ",t.hasAlphaChannel),t.hasAlphaChannel&&(console.log("image.alphaChannel ",t.alphaChannel),n=e.ref({Type:"XObject",Subtype:"Image",Height:t.height,Width:t.width,BitsPerComponent:8,Filter:"FlateDecode",ColorSpace:"DeviceGray",Decode:[0,1],stream:t.alphaChannel})),n},getConvertedText=e=>e.split("").map(e=>specialCharacters.includes(e)?getOctalCodeFromCharacter(e):e).join(""),getOctalCodeFromCharacter=e=>"\\"+e.charCodeAt(0).toString(8),pdfkitAddPlaceholder=({pdf:e,pdfBuffer:a,reason:r,contactInfo:t="emailfromp1289@gmail.com",name:n="Name from p12",location:o="Location from p12",signatureLength:i=DEFAULT_SIGNATURE_LENGTH,byteRangePlaceholder:l=DEFAULT_BYTE_RANGE_PLACEHOLDER,subFilter:g=SUBFILTER_ADOBE_PKCS7_DETACHED,sign:c})=>{var d=getFont(e,"Helvetica"),s=getFont(e,"ZapfDingbats"),f=getFont(e,"Helvetica"),p=c.Base64,p=getAnnotationApparance(e,getImage(Buffer.from(p,"base64"),e),f),f=e.ref({Type:"Sig",Filter:"Adobe.PPKLite",SubFilter:g,ByteRange:[0,l,l,l],Contents:Buffer.from(String.fromCharCode(0).repeat(i)),Reason:new String(r),M:new Date,ContactInfo:new String(t),Name:new String(n),Location:new String(o)}),h=a.lastIndexOf("/Type /AcroForm"),g=-1!==h;let m=[],C;if(g){let e=h;var S=h-10;let t="",n=11;for(n;n<22;n+=1){var A=a.slice(h-n,S).toString();if("\n"===A[0])break;t=A,e=h-n}l=a.slice(e),i=l.slice(0,l.indexOf("endobj")).toString(),r=(C=parseInt(t),i.slice(i.indexOf("/Fields [")+9,i.indexOf("]")));m=r.split(" ").filter((e,t)=>t%3==0).map(e=>new PDFKitReferenceMock(e))}m.length;t=c.Left,n=c.Bottom,o=t+c.Width,l=n+c.Height,i=e.ref({Type:"Annot",Subtype:"Widget",FT:"Sig",Rect:[t,n,o,l],V:f,T:new String("Signature"+(m.length+1)),F:4,P:e.page.dictionary,AP:`<</N ${p.index} 0 R>>`,DA:new String("/Helvetica 0 Tf 0 g")});e.page.dictionary.data.Annots=[i];let T;return T=g?e.ref({Type:"AcroForm",SigFlags:3,Fields:[...m,i],DR:`<</Font
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>>`,MediaBox:[0,10,200,60],Subtype:"Form"},null,getStream(t.index))}const getStream=e=>getConvertedText(`
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1.0 1.0 1.0 rg
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0.0 0.0 0.0 RG
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q
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q
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200 0 0 50 0 10 cm
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/Img${e} Do
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Q
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0 0 0 rg
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BT
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0 Tr
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/f1 10.0 Tf
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1.4 0 0 1 20 45.97412 Tm
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ET
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BT
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0 Tr
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/f1 10.0 Tf
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1.4 0 0 1 20 33.56006 Tm
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ET
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Q`),getFont=(e,t)=>e.ref({Type:"Font",BaseFont:t,Encoding:"WinAnsiEncoding",Subtype:"Type1"}),getJpgImage=(e,t)=>{if(65496!==t.readUInt16BE(0))throw"SOI not found in JPEG";let n=2,a;for(;n<t.length&&(a=t.readUInt16BE(n),n+=2,!MARKERS.includes(a));)n+=t.readUInt16BE(n);if(!MARKERS.includes(a))throw"Invalid JPEG.";n+=2;var r=t[n++],o=t.readUInt16BE(n),i=(n+=2,t.readUInt16BE(n)),l=(n+=2,t[n++]),l=COLOR_SPACE_MAP[l],r={Type:"XObject",Subtype:"Image",BitsPerComponent:r,Width:i,Height:o,ColorSpace:l,Filter:"DCTDecode"},i=("DeviceCMYK"===l&&(r.Decode=[1,0,1,0,1,0,1,0]),e.ref(r,null,t));return i},getPngImage=(e,t)=>{var t=new PNG(t),n=t.hasAlphaChannel,a={Type:"XObject",Subtype:"Image",BitsPerComponent:n?8:t.bits,Width:t.width,Height:t.height,Filter:"FlateDecode"};if(n||(r=e.ref({Predictor:15,Colors:t.colors,BitsPerComponent:t.bits,Columns:t.width}),a.DecodeParms=r),0===t.palette.length?a.ColorSpace=t.colorSpace:(r=e.ref({stream:new Buffer(t.palette)}),a.ColorSpace=["Indexed","DeviceRGB",t.palette.length/3-1,r]),null!=t.transparency.grayscale){var r=t.transparency.grayscale;a.Mask=[r,r]}else if(t.transparency.rgb){var o,r=t.transparency["rgb"],i=[];for(o of r)i.push(o,o);a.Mask=i}else t.transparency.indexed?loadIndexedAlphaChannel(t):n&&(splitAlphaChannel(t),r=getSmask(e,t),a.Mask=r);return e.ref(a,null,t.imgData)},loadIndexedAlphaChannel=e=>{const o=e.transparency.indexed;return e.decodePixels(n=>{var a=new Buffer(e.width*e.height);let r=0;for(let e=0,t=n.length;e<t;e++)a[r++]=o[n[e]];e.alphaChannel=zlib.deflateSync(a)})},splitAlphaChannel=d=>{d.decodePixels(t=>{let e,n;var a=d.colors,r=d.width*d.height,o=new Buffer(r*a),i=new Buffer(r);let l=n=e=0;for(var c=t.length,g=16===d.bits?1:0;l<c;){for(let e=0;e<a;e++)o[n++]=t[l++],l+=g;i[e++]=t[l++],l+=g}d.imgData=zlib.deflateSync(o),d.alphaChannel=zlib.deflateSync(i)})},getSmask=(e,t)=>{let n;return console.log("image.hasAlphaChannel ",t.hasAlphaChannel),t.hasAlphaChannel&&(console.log("image.alphaChannel ",t.alphaChannel),n=e.ref({Type:"XObject",Subtype:"Image",Height:t.height,Width:t.width,BitsPerComponent:8,Filter:"FlateDecode",ColorSpace:"DeviceGray",Decode:[0,1],stream:t.alphaChannel})),n},getConvertedText=e=>e.split("").map(e=>specialCharacters.includes(e)?getOctalCodeFromCharacter(e):e).join(""),getOctalCodeFromCharacter=e=>"\\"+e.charCodeAt(0).toString(8),pdfkitAddPlaceholder=({pdf:e,pdfBuffer:a,reason:r,contactInfo:t="emailfromp1289@gmail.com",name:n="Name from p12",location:o="Location from p12",signatureLength:i=DEFAULT_SIGNATURE_LENGTH,byteRangePlaceholder:l=DEFAULT_BYTE_RANGE_PLACEHOLDER,subFilter:c=SUBFILTER_ADOBE_PKCS7_DETACHED,sign:g})=>{var d=getFont(e,"Helvetica"),s=getFont(e,"ZapfDingbats"),p=getFont(e,"Helvetica"),f=g.Base64,f=getAnnotationApparance(e,getImage(Buffer.from(f,"base64"),e),p,g),p=e.ref({Type:"Sig",Filter:"Adobe.PPKLite",SubFilter:c,ByteRange:[0,l,l,l],Contents:Buffer.from(String.fromCharCode(0).repeat(i)),Reason:new String(r),M:new Date,ContactInfo:new String(t),Name:new String(n),Location:new String(o)}),h=a.lastIndexOf("/Type /AcroForm"),c=-1!==h;let m=[],C;if(c){let e=h;var S=h-10;let t="",n=11;for(n;n<22;n+=1){var A=a.slice(h-n,S).toString();if("\n"===A[0])break;t=A,e=h-n}l=a.slice(e),i=l.slice(0,l.indexOf("endobj")).toString(),r=(C=parseInt(t),i.slice(i.indexOf("/Fields [")+9,i.indexOf("]")));m=r.split(" ").filter((e,t)=>t%3==0).map(e=>new PDFKitReferenceMock(e))}t=g.Left,n=g.Bottom,o=t+g.Width,l=n+g.Height,i=e.ref({Type:"Annot",Subtype:"Widget",FT:"Sig",Rect:[t,n,o,l],V:p,T:new String("Signature"+(m.length+1)),F:4,P:e.page.dictionary,AP:`<</N ${f.index} 0 R>>`,DA:new String("/Helvetica 0 Tf 0 g")});e.page.dictionary.data.Annots=[i];let T;return T=c?e.ref({Type:"AcroForm",SigFlags:3,Fields:[...m,i],DR:`<</Font
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<</Helvetica ${d.index} 0 R/ZapfDingbats ${s.index} 0 R>>
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>>`},C):e.ref({Type:"AcroForm",SigFlags:3,Fields:[...m,i]}),{signature:f,form:e._root.data.AcroForm=T,widget:i}};export default pdfkitAddPlaceholder;
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>>`},C):e.ref({Type:"AcroForm",SigFlags:3,Fields:[...m,i]}),{signature:p,form:e._root.data.AcroForm=T,widget:i}};export default pdfkitAddPlaceholder;
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