521 lines
34 KiB
C#
521 lines
34 KiB
C#
using Microsoft.EntityFrameworkCore;
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using RMuseum.DbContext;
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using RMuseum.Models.Artifact;
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using RMuseum.Models.ImportJob;
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using RSecurityBackend.Models.Generic;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Http;
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using System.Security.Cryptography;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Xml.Linq;
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namespace RMuseum.Services.Implementation
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{
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/// <summary>
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/// IArtifactService implementation
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/// </summary>
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public partial class ArtifactService : IArtifactService
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{
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/// <summary>
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/// from https://catalog.hathitrust.org
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/// </summary>
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/// <param name="resourceNumber">006814127</param>
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/// <param name="friendlyUrl"></param>
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/// <returns></returns>
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private async Task<RServiceResult<bool>> StartImportingFromHathiTrust(string resourceNumber, string friendlyUrl)
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{
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string url = $"https://catalog.hathitrust.org/Record/{resourceNumber}.xml";
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if (
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(
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await _context.ImportJobs
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.Where(j => j.JobType == JobType.HathiTrust && j.ResourceNumber == resourceNumber && !(j.Status == ImportJobStatus.Failed || j.Status == ImportJobStatus.Aborted))
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.SingleOrDefaultAsync()
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)
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!=
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null
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)
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{
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return new RServiceResult<bool>(false, $"Job is already scheduled or running for importing {url}");
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}
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if (string.IsNullOrEmpty(friendlyUrl))
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{
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friendlyUrl = resourceNumber;
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}
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if (
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(await _context.Artifacts.Where(a => a.FriendlyUrl == friendlyUrl).SingleOrDefaultAsync())
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!=
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null
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)
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{
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return new RServiceResult<bool>(false, $"duplicated artifact friendly url '{friendlyUrl}'");
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}
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ImportJob job = new ImportJob()
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{
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JobType = JobType.HathiTrust,
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ResourceNumber = resourceNumber,
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FriendlyUrl = friendlyUrl,
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SrcUrl = url,
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QueueTime = DateTime.Now,
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ProgressPercent = 0,
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Status = ImportJobStatus.NotStarted
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};
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await _context.ImportJobs.AddAsync
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(
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job
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);
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await _context.SaveChangesAsync();
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try
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{
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_backgroundTaskQueue.QueueBackgroundWorkItem
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(
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async token =>
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{
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try
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{
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using (var client = new HttpClient())
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{
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using (var result = await client.GetAsync(url))
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{
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if (result.IsSuccessStatusCode)
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{
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using (RMuseumDbContext context = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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if (
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(await context.Artifacts.Where(a => a.FriendlyUrl == job.FriendlyUrl).SingleOrDefaultAsync())
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!=
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null
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)
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = "aborted because of duplicated friendly url";
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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return;
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}
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RArtifactMasterRecord book = new RArtifactMasterRecord($"extracted from {url}", $"extracted from {url}")
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{
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Status = PublishStatus.Draft,
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DateTime = DateTime.Now,
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LastModified = DateTime.Now,
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CoverItemIndex = 0,
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FriendlyUrl = friendlyUrl
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};
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List<RTagValue> meta = new List<RTagValue>();
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RTagValue tag;
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string xml = await result.Content.ReadAsStringAsync();
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.StartTime = DateTime.Now;
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job.Status = ImportJobStatus.Running;
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job.SrcContent = xml;
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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string title = "";
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string author = "";
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string pdfResourceNumber = "";
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int tagOrder = 1;
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XElement elObject = XDocument.Parse(xml).Root;
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foreach (var datafield in elObject.Element("record").Elements("datafield"))
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{
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tagOrder++;
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if (datafield.Attribute("tag") == null)
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continue;
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string hathiTrustTag = datafield.Attribute("tag").Value;
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switch (hathiTrustTag)
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{
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case "245":
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case "246":
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foreach (var subfield in datafield.Elements("subfield"))
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{
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if (subfield.Attribute("code") != null)
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{
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if (subfield.Attribute("code").Value == "a" || subfield.Attribute("code").Value == "f")
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title = (title + " " + subfield.Value).Trim();
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}
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}
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break;
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case "100":
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foreach (var subfield in datafield.Elements("subfield"))
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{
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if (subfield.Attribute("code") != null)
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{
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if (subfield.Attribute("code").Value == "a" || subfield.Attribute("code").Value == "d")
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author = (author + " " + subfield.Value).Trim();
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}
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}
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break;
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case "HOL":
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foreach (var subfield in datafield.Elements("subfield"))
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{
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if (subfield.Attribute("code") != null)
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{
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if (subfield.Attribute("code").Value == "p")
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pdfResourceNumber = subfield.Value;
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}
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}
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break;
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default:
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{
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if (int.TryParse(hathiTrustTag, out int tmp))
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{
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if (tmp >= 100 && tmp <= 900)
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{
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string note = "";
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foreach (var subfield in datafield.Elements("subfield"))
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{
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if (subfield.Attribute("code") != null)
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{
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note = (note + " " + subfield.Value).Trim();
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}
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}
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tag = await TagHandler.PrepareAttribute(context, "Notes", note, tagOrder);
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meta.Add(tag);
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}
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}
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}
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break;
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}
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}
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if (string.IsNullOrEmpty(pdfResourceNumber))
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = "pdfResourceNumber not found";
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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return;
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}
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tag = await TagHandler.PrepareAttribute(context, "Title", title, 1);
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meta.Add(tag);
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tag = await TagHandler.PrepareAttribute(context, "Contributor Names", author, 1);
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meta.Add(tag);
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tag = await TagHandler.PrepareAttribute(context, "Type", "Book", 1);
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meta.Add(tag);
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tag = await TagHandler.PrepareAttribute(context, "Type", "Manuscript", 1);
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meta.Add(tag);
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tag = await TagHandler.PrepareAttribute(context, "Source", "HathiTrust Digital Library", 1);
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string viewerUrl = $"https://babel.hathitrust.org/cgi/pt?id={pdfResourceNumber}";
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tag.ValueSupplement = viewerUrl;
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meta.Add(tag);
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book.Name = book.NameInEnglish = book.Description = book.DescriptionInEnglish = title;
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book.Tags = meta.ToArray();
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List<RArtifactItemRecord> pages = new List<RArtifactItemRecord>();
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string lastMD5hash = "";
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int order = 0;
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while (true)
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{
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order++;
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.ProgressPercent = order;
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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string imageUrl = $"https://babel.hathitrust.org/cgi/imgsrv/image?id={pdfResourceNumber};seq={order};size=1000;rotation=0";
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RArtifactItemRecord page = new RArtifactItemRecord()
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{
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Name = $"تصویر {order}",
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NameInEnglish = $"Image {order}",
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Description = "",
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DescriptionInEnglish = "",
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Order = order,
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FriendlyUrl = $"p{$"{order}".PadLeft(4, '0')}",
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LastModified = DateTime.Now
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};
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tag = await TagHandler.PrepareAttribute(context, "Source", "HathiTrust Digital Library", 1);
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tag.ValueSupplement = viewerUrl;
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page.Tags = new RTagValue[] { tag };
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if (!string.IsNullOrEmpty(imageUrl))
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{
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bool recovered = false;
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if (
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "orig"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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&&
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "norm"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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&&
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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)
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{
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RServiceResult<RPictureFile> picture = await _pictureFileService.RecoverFromeFiles(page.Name, page.Description, 1,
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imageUrl,
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "orig"), $"{order}".PadLeft(4, '0') + ".jpg"),
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "norm"), $"{order}".PadLeft(4, '0') + ".jpg"),
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg"),
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$"{order}".PadLeft(4, '0') + ".jpg", friendlyUrl);
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if (picture.Result != null)
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{
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recovered = true;
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page.Images = new RPictureFile[] { picture.Result };
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page.CoverImageIndex = 0;
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if (book.CoverItemIndex == (order - 1))
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{
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book.CoverImage = RPictureFile.Duplicate(picture.Result);
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}
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pages.Add(page);
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}
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}
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if (!recovered)
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{
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if (
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "orig"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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)
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{
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "orig"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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}
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if (
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "norm"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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)
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{
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "norm"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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}
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if (
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File.Exists
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg")
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)
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)
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{
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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}
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var imageResult = await client.GetAsync(imageUrl);
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int _ImportRetryCount = 200;
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int _ImportRetryInitialSleep = 500;
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int retryCount = 0;
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while (retryCount < _ImportRetryCount && !imageResult.IsSuccessStatusCode && imageResult.StatusCode == HttpStatusCode.ServiceUnavailable)
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{
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imageResult.Dispose();
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Thread.Sleep(_ImportRetryInitialSleep * (retryCount + 1));
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imageResult = await client.GetAsync(imageUrl);
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retryCount++;
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}
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if (imageResult.IsSuccessStatusCode)
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{
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using (Stream imageStream = await imageResult.Content.ReadAsStreamAsync())
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{
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RServiceResult<RPictureFile> picture = await _pictureFileService.Add(page.Name, page.Description, 1, null, imageUrl, imageStream, $"{order}".PadLeft(4, '0') + ".jpg", friendlyUrl);
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if (picture.Result == null)
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{
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throw new Exception($"_pictureFileService.Add : {picture.ExceptionString}");
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}
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bool lastPage = false;
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using (var md5 = MD5.Create())
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{
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string md5hash = string.Join("", md5.ComputeHash(File.ReadAllBytes(Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg"))).Select(x => x.ToString("X2")));
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if (md5hash == lastMD5hash)
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{
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "orig"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "norm"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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File.Delete
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(
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Path.Combine(Path.Combine(Path.Combine(_pictureFileService.ImageStoragePath, friendlyUrl), "thumb"), $"{order}".PadLeft(4, '0') + ".jpg")
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);
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lastPage = true;
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}
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lastMD5hash = md5hash;
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}
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if (!lastPage)
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{
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page.Images = new RPictureFile[] { picture.Result };
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page.CoverImageIndex = 0;
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if (book.CoverItemIndex == (order - 1))
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{
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book.CoverImage = RPictureFile.Duplicate(picture.Result);
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}
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pages.Add(page);
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}
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else
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{
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break;
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}
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}
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}
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else
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = $"Http result is not ok ({imageResult.StatusCode}) for page {order}, url {imageUrl}";
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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imageResult.Dispose();
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return;
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}
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imageResult.Dispose();
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GC.Collect();
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}
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}
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}
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book.Items = pages.ToArray();
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book.ItemCount = pages.Count;
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if (pages.Count == 0)
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = "ages.Count == 0";
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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return;
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}
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await context.Artifacts.AddAsync(book);
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await context.SaveChangesAsync();
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job.ProgressPercent = 100;
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job.Status = ImportJobStatus.Succeeded;
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job.ArtifactId = book.Id;
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job.EndTime = DateTime.Now;
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context.Update(job);
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await context.SaveChangesAsync();
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}
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}
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else
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = $"Http result is not ok ({result.StatusCode}) for {url}";
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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return;
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}
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}
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}
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}
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catch (Exception exp)
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{
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using (RMuseumDbContext importJobUpdaterDb = new RMuseumDbContext(new DbContextOptions<RMuseumDbContext>()))
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{
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job.EndTime = DateTime.Now;
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job.Status = ImportJobStatus.Failed;
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job.Exception = exp.ToString();
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importJobUpdaterDb.Update(job);
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await importJobUpdaterDb.SaveChangesAsync();
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}
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}
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}
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);
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return new RServiceResult<bool>(true);
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}
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catch (Exception exp)
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{
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return new RServiceResult<bool>(false, exp.ToString());
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}
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}
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}
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}
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