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using Microsoft.EntityFrameworkCore;
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using AutoMapper;
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using Models.Tags;
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using Ganss.XSS;
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using HtmlAgilityPack;
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using System.Text.RegularExpressions;
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namespace Core.Services.AnnotationService
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{
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... | ... | |
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.Include(a => a.User)
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.Include(a => a.Document).ThenInclude(d => d.Content)
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.First();
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if (userRole < ERole.ADMINISTRATOR)
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{
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if (annotation.User.Id != userId)
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... | ... | |
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}
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var documentContent = context.Documents.Where(d => d.Id == annotation.Document.Id).Select(d => d.Content).First();
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var preprocessingResult = PreprocessHTML(documentContent.Content);
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// We probably cannot use AutoMapper since we are dealing with too many different entities
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AnnotationInfo annotationInfo = new()
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{
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DocumentText = documentContent.Content,
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SourceDocumentContent = documentContent.Content,
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DocumentToRender = preprocessingResult.docToRender,
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TagStartPositions = preprocessingResult.openingTagPositions,
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TagLengths = preprocessingResult.openingTagLengths,
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Note = annotation.Note,
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State = annotation.State,
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Type = IsHtml(documentContent.Content) ? EDocumentType.HTML : EDocumentType.TEXT
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... | ... | |
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return annotationInfo;
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}
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private (string docToRender, int[] openingTagPositions, int[] openingTagLengths, int[] closingTagPositions, int[] closingTagLengths) PreprocessHTML(string htmlSource)
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{
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var docOriginal = new HtmlDocument();
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docOriginal.LoadHtml(htmlSource);
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var docToEdit = new HtmlDocument();
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docToEdit.LoadHtml(htmlSource);
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string idAttributeName = "aswi-tag-id";
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var descendantsOriginal = docOriginal.DocumentNode.DescendantsAndSelf();
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var descendantsToEdit = docToEdit.DocumentNode.DescendantsAndSelf();
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List<int> tagStartPositions = new();
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List<int> tagStartLengths = new();
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List<int> tagClosingPositions = new();
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List<int> tagClosingLengths = new();
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int currentId = 0;
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var zipped = descendantsOriginal.Zip(descendantsToEdit, (orig, toEdit) => new { Original = orig, ToEdit = toEdit });
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foreach (var node in zipped)
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{
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var originalNode = node.Original;
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var toEditNode = node.ToEdit;
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if (originalNode.Name.Contains("#"))
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{
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continue;
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}
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tagStartPositions.Add(originalNode.OuterStartIndex);
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tagStartLengths.Add(originalNode.OuterStartIndex - originalNode.InnerStartIndex);
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currentId = tagStartPositions.Count - 1;
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toEditNode.Attributes.Add(idAttributeName, currentId.ToString());
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tagClosingPositions.Add(originalNode.InnerStartIndex + originalNode.InnerLength);
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tagClosingLengths.Add((originalNode.OuterStartIndex + originalNode.OuterLength) - (originalNode.InnerStartIndex + originalNode.InnerLength));
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}
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string docToRender = docToEdit.DocumentNode.OuterHtml;
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HtmlSanitizer sanitizer = new HtmlSanitizer();
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sanitizer.AllowedAttributes.Clear();
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sanitizer.AllowedAttributes.Add(idAttributeName);
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docToRender = sanitizer.Sanitize(docToRender);
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return (docToRender, tagStartPositions.ToArray(), tagStartLengths.ToArray(), tagClosingPositions.ToArray(), tagClosingLengths.ToArray());
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}
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// TODO temporary
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private bool IsHtml(string text)
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{
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HTML preprocessing and sanitization