среда, 25 февраля 2015 г.

Добавление водяного знака и защиты документа в word средствами openxml на C#

Создавать и редактировать документы word можно как с помощью OLE объекта так и напрямую с помощью openxml. Второй вариант предпочтительнее как по скорости работы, так и по надежности.
Для создания и редактирование документа word формата docx существует не мало библиотек, вот некоторые из них: GemBox, Aspose, WordGlue и DocX. Только последний является бесплатным, но к сожалению несет в себе некоторые ограничения, в общем эти ограничения возможно присутствуют и в других библиотеках.

К примеру дана задача, сгенерировать документ word с водяным знаком, и при этом, запретить удалять пользователям этот водяной знак, но пользователь должен иметь возможность изменять любой текст в документе. Нетривиальная задача, реализация которой с помощью вышеуказанных библиотек навряд ли возможна.

Для того, чтобы запретить пользователю удалять водяной знак необходимо защитить документ, а для того, чтобы дать возможность редактировать текст в документе, необходимо добавить области которые пользователь может редактировать.





Для работы с openxml понадобится библиотека DocumentFormat.OpenXml.dll, также в проект нужно добавить стандартную библиотеку WindowsBase.


Создание водяного знака


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using System.IO;
using System.Linq;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Vml;
using DocumentFormat.OpenXml.Vml.Office;
using DocumentFormat.OpenXml.Vml.Wordprocessing;
using DocumentFormat.OpenXml.Wordprocessing;
using HorizontalAnchorValues = DocumentFormat.OpenXml.Vml.Wordprocessing.HorizontalAnchorValues;
using Lock = DocumentFormat.OpenXml.Vml.Office.Lock;
using Path = DocumentFormat.OpenXml.Vml.Path;
using VerticalAnchorValues = DocumentFormat.OpenXml.Vml.Wordprocessing.VerticalAnchorValues;

namespace WordUtils
{
    class WordWatermark
    {
        public static void AddWatermarkInDoc(string fileName, string textWatermark)
        {
            byte[] sourceBytes = File.ReadAllBytes(fileName);

            MemoryStream inMemoryStream = new MemoryStream();
            inMemoryStream.Write(sourceBytes, 0, (int)sourceBytes.Length);

            var doc = WordprocessingDocument.Open(inMemoryStream, true);
            AddWatermark(doc, textWatermark);
            doc.MainDocumentPart.Document.Save();

            doc.Close();
            doc.Dispose();
            doc = null;

            using (FileStream fileStream = new FileStream(fileName, FileMode.Create))
            {
                inMemoryStream.WriteTo(fileStream);
            }

            inMemoryStream.Close();
            inMemoryStream.Dispose();
            inMemoryStream = null;
        }

        static void AddWatermark(WordprocessingDocument doc, string textWatermark)
        {
            if (doc.MainDocumentPart.HeaderParts.Count() == 0)
            {
                doc.MainDocumentPart.DeleteParts(doc.MainDocumentPart.HeaderParts);
                var newHeaderPart = doc.MainDocumentPart.AddNewPart<HeaderPart>();
                var rId = doc.MainDocumentPart.GetIdOfPart(newHeaderPart);
                var headerRef = new HeaderReference();
                headerRef.Id = rId;
                var sectionProps = doc.MainDocumentPart.Document.Body.Elements<SectionProperties>().LastOrDefault();
                if (sectionProps == null)
                {
                    sectionProps = new SectionProperties();
                    doc.MainDocumentPart.Document.Body.Append(sectionProps);
                }
                sectionProps.RemoveAllChildren<HeaderReference>();
                sectionProps.Append(headerRef);

                newHeaderPart.Header = MakeHeader();
                newHeaderPart.Header.Save();
            }

            foreach (HeaderPart headerPart in doc.MainDocumentPart.HeaderParts)
            {
                var sdtBlock1 = new SdtBlock();
                var sdtProperties1 = new SdtProperties();
                var sdtId1 = new SdtId() { Val = 87908844 };
                var sdtContentDocPartObject1 = new SdtContentDocPartObject();
                var docPartGallery1 = new DocPartGallery() { Val = "Watermarks" };
                var docPartUnique1 = new DocPartUnique();
                sdtContentDocPartObject1.Append(docPartGallery1);
                sdtContentDocPartObject1.Append(docPartUnique1);
                sdtProperties1.Append(sdtId1);
                sdtProperties1.Append(sdtContentDocPartObject1);

                var sdtContentBlock1 = new SdtContentBlock();
                var paragraph2 = new Paragraph()
                {
                    RsidParagraphAddition = "00656E18",
                    RsidRunAdditionDefault = "00656E18"
                };
                var paragraphProperties2 = new ParagraphProperties();
                var paragraphStyleId2 = new ParagraphStyleId() { Val = "Header" };
                paragraphProperties2.Append(paragraphStyleId2);
                var run1 = new Run();
                var runProperties1 = new RunProperties();
                var noProof1 = new NoProof();
                var languages1 = new Languages() { EastAsia = "zh-TW" };
                runProperties1.Append(noProof1);
                runProperties1.Append(languages1);
                var picture1 = new Picture();
                var shapetype1 = new Shapetype()
                {
                    Id = "_x0000_t136",
                    CoordinateSize = "21600,21600",
                    OptionalNumber = 136,
                    Adjustment = "10800",
                    EdgePath = "m@7,l@8,m@5,21600l@6,21600e"
                };
                var formulas1 = new Formulas();
                var formula1 = new Formula() { Equation = "sum #0 0 10800" };
                var formula2 = new Formula() { Equation = "prod #0 2 1" };
                var formula3 = new Formula() { Equation = "sum 21600 0 @1" };
                var formula4 = new Formula() { Equation = "sum 0 0 @2" };
                var formula5 = new Formula() { Equation = "sum 21600 0 @3" };
                var formula6 = new Formula() { Equation = "if @0 @3 0" };
                var formula7 = new Formula() { Equation = "if @0 21600 @1" };
                var formula8 = new Formula() { Equation = "if @0 0 @2" };
                var formula9 = new Formula() { Equation = "if @0 @4 21600" };
                var formula10 = new Formula() { Equation = "mid @5 @6" };
                var formula11 = new Formula() { Equation = "mid @8 @5" };
                var formula12 = new Formula() { Equation = "mid @7 @8" };
                var formula13 = new Formula() { Equation = "mid @6 @7" };
                var formula14 = new Formula() { Equation = "sum @6 0 @5" };

                formulas1.Append(formula1);
                formulas1.Append(formula2);
                formulas1.Append(formula3);
                formulas1.Append(formula4);
                formulas1.Append(formula5);
                formulas1.Append(formula6);
                formulas1.Append(formula7);
                formulas1.Append(formula8);
                formulas1.Append(formula9);
                formulas1.Append(formula10);
                formulas1.Append(formula11);
                formulas1.Append(formula12);
                formulas1.Append(formula13);
                formulas1.Append(formula14);
                var path1 = new Path()
                {
                    AllowTextPath = TrueFalseValue.FromBoolean(true),
                    ConnectionPointType = ConnectValues.Custom,
                    ConnectionPoints = "@9,0;@10,10800;@11,21600;@12,10800",
                    ConnectAngles = "270,180,90,0"
                };
                var textPath1 = new TextPath()
                {
                    On = TrueFalseValue.FromBoolean(true),
                    FitShape = TrueFalseValue.FromBoolean(true)
                };
                var shapeHandles1 = new ShapeHandles();

                var shapeHandle1 = new ShapeHandle()
                {
                    Position = "#0,bottomRight",
                    XRange = "6629,14971"
                };

                shapeHandles1.Append(shapeHandle1);

                var lock1 = new Lock
                {
                    Extension = ExtensionHandlingBehaviorValues.Edit,
                    TextLock = TrueFalseValue.FromBoolean(true),
                    ShapeType = TrueFalseValue.FromBoolean(true)
                };

                shapetype1.Append(formulas1);
                shapetype1.Append(path1);
                shapetype1.Append(textPath1);
                shapetype1.Append(shapeHandles1);
                shapetype1.Append(lock1);
                var shape1 = new Shape()
                {
                    Id = "PowerPlusWaterMarkObject357922611",
                    Style = "position:absolute;left:0;text-align:left;margin-left:0;margin-top:0;width:527.85pt;height:131.95pt;rotation:315;z-index:-251656192;mso-position-horizontal:center;mso-position-horizontal-relative:margin;mso-position-vertical:center;mso-position-vertical-relative:margin",
                    OptionalString = "_x0000_s2049",
                    AllowInCell = TrueFalseValue.FromBoolean(true),
                    FillColor = "silver",
                    Stroked = TrueFalseValue.FromBoolean(false),
                    Type = "#_x0000_t136"
                };


                var fill1 = new Fill() { Opacity = ".5" };
                TextPath textPath2 = new TextPath()
                {
                    Style = "font-family:\"Calibri\";font-size:1pt",
                    String = textWatermark
                };

                var textWrap1 = new TextWrap()
                {
                    AnchorX = HorizontalAnchorValues.Margin,
                    AnchorY = VerticalAnchorValues.Margin
                };

                shape1.Append(fill1);
                shape1.Append(textPath2);
                shape1.Append(textWrap1);
                picture1.Append(shapetype1);
                picture1.Append(shape1);
                run1.Append(runProperties1);
                run1.Append(picture1);
                paragraph2.Append(paragraphProperties2);
                paragraph2.Append(run1);
                sdtContentBlock1.Append(paragraph2);
                sdtBlock1.Append(sdtProperties1);
                sdtBlock1.Append(sdtContentBlock1);
                headerPart.Header.Append(sdtBlock1);
                headerPart.Header.Save();
                //break;
            }
        }

        static Header MakeHeader()
        {
            var header = new Header();
            var paragraph = new Paragraph();
            var run = new Run();
            var text = new Text();
            text.Text = "";
            run.Append(text);
            paragraph.Append(run);
            header.Append(paragraph);
            return header;
        }
    }
}


В метод AddWatermarkInDoc передается путь к файлу и текст, который будет в водяном знаке.
По необходимости можно изменить прозрачность, сделать обводку.
Для этого нужно поменять в коде для прозрачности строка
var fill1 = new Fill() { Opacity = ".5" };
и для обводки вместо
Stroked = TrueFalseValue.FromBoolean(false) написать
Stroked = TrueFalseValue.FromBoolean(true).

Защита документа

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using System;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;

namespace WordUtils
{
    class ProtectWord
    {
        static int[] InitialCodeArray = { 0xE1F0, 0x1D0F, 0xCC9C, 0x84C0, 0x110C, 0x0E10, 0xF1CE, 0x313E, 0x1872, 0xE139, 0xD40F, 0x84F9, 0x280C, 0xA96A, 0x4EC3 };

        static int[,] EncryptionMatrix = new int[15, 7]
        {
                
                /* char 1  */ {0xAEFC, 0x4DD9, 0x9BB2, 0x2745, 0x4E8A, 0x9D14, 0x2A09},
                /* char 2  */ {0x7B61, 0xF6C2, 0xFDA5, 0xEB6B, 0xC6F7, 0x9DCF, 0x2BBF},
                /* char 3  */ {0x4563, 0x8AC6, 0x05AD, 0x0B5A, 0x16B4, 0x2D68, 0x5AD0},
                /* char 4  */ {0x0375, 0x06EA, 0x0DD4, 0x1BA8, 0x3750, 0x6EA0, 0xDD40},
                /* char 5  */ {0xD849, 0xA0B3, 0x5147, 0xA28E, 0x553D, 0xAA7A, 0x44D5},
                /* char 6  */ {0x6F45, 0xDE8A, 0xAD35, 0x4A4B, 0x9496, 0x390D, 0x721A},
                /* char 7  */ {0xEB23, 0xC667, 0x9CEF, 0x29FF, 0x53FE, 0xA7FC, 0x5FD9},
                /* char 8  */ {0x47D3, 0x8FA6, 0x0F6D, 0x1EDA, 0x3DB4, 0x7B68, 0xF6D0},
                /* char 9  */ {0xB861, 0x60E3, 0xC1C6, 0x93AD, 0x377B, 0x6EF6, 0xDDEC},
                /* char 10 */ {0x45A0, 0x8B40, 0x06A1, 0x0D42, 0x1A84, 0x3508, 0x6A10},
                /* char 11 */ {0xAA51, 0x4483, 0x8906, 0x022D, 0x045A, 0x08B4, 0x1168},
                /* char 12 */ {0x76B4, 0xED68, 0xCAF1, 0x85C3, 0x1BA7, 0x374E, 0x6E9C},
                /* char 13 */ {0x3730, 0x6E60, 0xDCC0, 0xA9A1, 0x4363, 0x86C6, 0x1DAD},
                /* char 14 */ {0x3331, 0x6662, 0xCCC4, 0x89A9, 0x0373, 0x06E6, 0x0DCC},
                /* char 15 */ {0x1021, 0x2042, 0x4084, 0x8108, 0x1231, 0x2462, 0x48C4}
        };

        private static byte[] concatByteArrays(byte[] array1, byte[] array2)
        {
            byte[] result = new byte[array1.Length + array2.Length];
            Buffer.BlockCopy(array2, 0, result, 0, array2.Length);
            Buffer.BlockCopy(array1, 0, result, array2.Length, array1.Length);
            return result;
        }

        public static void AddProtectionInDoc(string fileName, string strPassword)
        {
            byte[] sourceBytes = File.ReadAllBytes(fileName);

            MemoryStream inMemoryStream = new MemoryStream();
            inMemoryStream.Write(sourceBytes, 0, (int)sourceBytes.Length);

            var doc = WordprocessingDocument.Open(inMemoryStream, true);
            ApplyDocumentProtection(doc, strPassword);
            doc.MainDocumentPart.Document.Save();

            doc.Close();
            doc.Dispose();
            doc = null;

            using (FileStream fileStream = new FileStream(fileName, FileMode.Create))
            {
                inMemoryStream.WriteTo(fileStream);
            }

            inMemoryStream.Close();
            inMemoryStream.Dispose();
            inMemoryStream = null;
        }

        // Main implementation
        private static void ApplyDocumentProtection(WordprocessingDocument wdDocument, string strPassword)
        {
            // Generate the Salt
            byte[] arrSalt = new byte[16];
            RandomNumberGenerator rand = new RNGCryptoServiceProvider();
            rand.GetNonZeroBytes(arrSalt);

            //Array to hold Key Values
            byte[] generatedKey = new byte[4];

            //Maximum length of the password is 15 chars.
            int intMaxPasswordLength = 15;


            if (!String.IsNullOrEmpty(strPassword))
            {
                // Truncate the password to 15 characters
                strPassword = strPassword.Substring(0, Math.Min(strPassword.Length, intMaxPasswordLength));

                // Construct a new NULL-terminated string consisting of single-byte characters:
                //  -- > Get the single-byte values by iterating through the Unicode characters of the truncated Password.
                //   --> For each character, if the low byte is not equal to 0, take it. Otherwise, take the high byte.

                byte[] arrByteChars = new byte[strPassword.Length];

                for (int intLoop = 0; intLoop < strPassword.Length; intLoop++)
                {
                    int intTemp = Convert.ToInt32(strPassword[intLoop]);
                    arrByteChars[intLoop] = Convert.ToByte(intTemp & 0x00FF);
                    if (arrByteChars[intLoop] == 0)
                        arrByteChars[intLoop] = Convert.ToByte((intTemp & 0xFF00) >> 8);
                }

                // Compute the high-order word of the new key:

                // --> Initialize from the initial code array (see below), depending on the strPassword’s length. 
                int intHighOrderWord = InitialCodeArray[arrByteChars.Length - 1];

                // --> For each character in the strPassword:
                //      --> For every bit in the character, starting with the least significant and progressing to (but excluding) 
                //          the most significant, if the bit is set, XOR the key’s high-order word with the corresponding word from 
                //          the Encryption Matrix

                for (int intLoop = 0; intLoop < arrByteChars.Length; intLoop++)
                {
                    int tmp = intMaxPasswordLength - arrByteChars.Length + intLoop;
                    for (int intBit = 0; intBit < 7; intBit++)
                    {
                        if ((arrByteChars[intLoop] & (0x0001 << intBit)) != 0)
                        {
                            intHighOrderWord ^= EncryptionMatrix[tmp, intBit];
                        }
                    }
                }

                // Compute the low-order word of the new key:

                // Initialize with 0
                int intLowOrderWord = 0;

                // For each character in the strPassword, going backwards
                for (int intLoopChar = arrByteChars.Length - 1; intLoopChar >= 0; intLoopChar--)
                {
                    // low-order word = (((low-order word SHR 14) AND 0x0001) OR (low-order word SHL 1) AND 0x7FFF)) XOR character
                    intLowOrderWord = (((intLowOrderWord >> 14) & 0x0001) | ((intLowOrderWord << 1) & 0x7FFF)) ^ arrByteChars[intLoopChar];
                }

                // Lastly,low-order word = (((low-order word SHR 14) AND 0x0001) OR (low-order word SHL 1) AND 0x7FFF)) XOR strPassword length XOR 0xCE4B.
                intLowOrderWord = (((intLowOrderWord >> 14) & 0x0001) | ((intLowOrderWord << 1) & 0x7FFF)) ^ arrByteChars.Length ^ 0xCE4B;

                // Combine the Low and High Order Word
                int intCombinedkey = (intHighOrderWord << 16) + intLowOrderWord;

                // The byte order of the result shall be reversed [Example: 0x64CEED7E becomes 7EEDCE64. end example],
                // and that value shall be hashed as defined by the attribute values.

                for (int intTemp = 0; intTemp < 4; intTemp++)
                {
                    generatedKey[intTemp] = Convert.ToByte(((uint)(intCombinedkey & (0x000000FF << (intTemp * 8)))) >> (intTemp * 8));
                }
            }

            // Implementation Notes List:
            // --> In this third stage, the reversed byte order legacy hash from the second stage shall be converted to Unicode hex 
            // --> string representation 
            StringBuilder sb = new StringBuilder();
            for (int intTemp = 0; intTemp < 4; intTemp++)
            {
                sb.Append(Convert.ToString(generatedKey[intTemp], 16));
            }
            generatedKey = Encoding.Unicode.GetBytes(sb.ToString().ToUpper());

            // Implementation Notes List:
            //Word appends the binary form of the salt attribute and not the base64 string representation when hashing
            // Before calculating the initial hash, you are supposed to prepend (not append) the salt to the key
            byte[] tmpArray1 = generatedKey;
            byte[] tmpArray2 = arrSalt;
            byte[] tempKey = new byte[tmpArray1.Length + tmpArray2.Length];
            Buffer.BlockCopy(tmpArray2, 0, tempKey, 0, tmpArray2.Length);
            Buffer.BlockCopy(tmpArray1, 0, tempKey, tmpArray2.Length, tmpArray1.Length);
            generatedKey = tempKey;


            // Iterations specifies the number of times the hashing function shall be iteratively run (using each
            // iteration's result as the input for the next iteration).
            int iterations = 50000;

            // Implementation Notes List:
            //Word requires that the initial hash of the password with the salt not be considered in the count.
            //    The initial hash of salt + key is not included in the iteration count.
            HashAlgorithm sha1 = new SHA1Managed();
            generatedKey = sha1.ComputeHash(generatedKey);
            byte[] iterator = new byte[4];
            for (int intTmp = 0; intTmp < iterations; intTmp++)
            {

                //When iterating on the hash, you are supposed to append the current iteration number.
                iterator[0] = Convert.ToByte((intTmp & 0x000000FF) >> 0);
                iterator[1] = Convert.ToByte((intTmp & 0x0000FF00) >> 8);
                iterator[2] = Convert.ToByte((intTmp & 0x00FF0000) >> 16);
                iterator[3] = Convert.ToByte((intTmp & 0xFF000000) >> 24);

                generatedKey = concatByteArrays(iterator, generatedKey);
                generatedKey = sha1.ComputeHash(generatedKey);
            }

            // Apply the element
            DocumentProtection documentProtection = new DocumentProtection();
            documentProtection.Edit = DocumentProtectionValues.ReadOnly;

            OnOffValue docProtection = new OnOffValue(true);
            documentProtection.Enforcement = docProtection;

            documentProtection.CryptographicAlgorithmClass = CryptAlgorithmClassValues.Hash;
            documentProtection.CryptographicProviderType = CryptProviderValues.RsaFull;
            documentProtection.CryptographicAlgorithmType = CryptAlgorithmValues.TypeAny;
            documentProtection.CryptographicAlgorithmSid = 4; // SHA1
            //    The iteration count is unsigned
            UInt32Value uintVal = new UInt32Value();
            uintVal.Value = (uint)iterations;
            documentProtection.CryptographicSpinCount = uintVal;
            documentProtection.Hash = Convert.ToBase64String(generatedKey);
            documentProtection.Salt = Convert.ToBase64String(arrSalt);

            // if protection in current document is exist then delete it
            DocumentProtection existingDocumentProtection = wdDocument.MainDocumentPart.DocumentSettingsPart.Settings.Descendants<DocumentProtection>().FirstOrDefault();
            if (existingDocumentProtection != null)
            {
                existingDocumentProtection.Remove();
            }

            wdDocument.MainDocumentPart.DocumentSettingsPart.Settings.AppendChild(documentProtection);
            wdDocument.MainDocumentPart.DocumentSettingsPart.Settings.Save();            
        }
    }
}

В метод AddProtectionInDoc передаем путь к файлу и пароль.
Данный код создаст защиту документа, которую можно будет отключить только по паролю.

Добавление в защищенный элемент области, разрешенные для редактирования


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// for all text
foreach (var text in body.Descendants<Text>())
{
    PermStart newPermStart = new PermStart();
    newPermStart.Id = id;
    newPermStart.EditorGroup = RangePermissionEditingGroupValues.Everyone;
    text.InsertBeforeSelf(newPermStart);
    PermEnd newPermEnd = new PermEnd();
    newPermEnd.Id = id++;
    text.InsertAfterSelf(newPermEnd);
}
// for all table
var paras = body.Elements<Table>();

foreach (var para in paras)
{
    PermStart newPermStart = new PermStart();
    newPermStart.Id = id;
    newPermStart.EditorGroup = RangePermissionEditingGroupValues.Everyone;
    para.InsertBeforeSelf(newPermStart);
    PermEnd newPermEnd = new PermEnd();
    newPermEnd.Id = id++;
    para.InsertAfterSelf(newPermEnd);
}
wdDocument.MainDocumentPart.Document.Save();

// for headers
foreach (HeaderPart headerPart in wdDocument.MainDocumentPart.HeaderParts)
{
    foreach (var text in headerPart.RootElement.Descendants<Text>())
    {
        PermStart newPermStart = new PermStart();
        newPermStart.Id = id;
        newPermStart.EditorGroup = RangePermissionEditingGroupValues.Everyone;
        text.InsertBeforeSelf(newPermStart);
        PermEnd newPermEnd = new PermEnd();
        newPermEnd.Id = id++;
        text.InsertAfterSelf(newPermEnd);
    }
    headerPart.Header.Save();
}

foreach (FooterPart footerPart in wdDocument.MainDocumentPart.FooterParts)
{
    foreach (var text in footerPart.RootElement.Descendants<Text>())
    {
        PermStart newPermStart = new PermStart();
        newPermStart.Id = id;
        newPermStart.EditorGroup = RangePermissionEditingGroupValues.Everyone;
        text.InsertBeforeSelf(newPermStart);
        PermEnd newPermEnd = new PermEnd();
        newPermEnd.Id = id++;
        text.InsertAfterSelf(newPermEnd);
    }
    footerPart.Footer.Save();
}

Первая половина кода создает разрешенные области в самом документе для текстовых фрагментов и таблиц.
Вторая половина добавляет разрешенные области в колонтитулы.

Пример

Весь код с примером лежит на GitHub.

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