MetadataController.cs 8.07 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220
using Coscine.Api.Project.Models;
using Coscine.ApiCommons;
using Coscine.ApiCommons.Exceptions;
using Coscine.ApiCommons.Factories;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json.Linq;
using System;
using System.Linq;
using VDS.RDF.Writing;
using VDS.RDF.Parsing;
using VDS.RDF;
using Metadata;
using System.Web;
using System.IO;

namespace Coscine.Api.Project.Controllers
{
    public class MetadataController : Controller
    {
        private readonly Authenticator _authenticator;
        private readonly MetadataModel _metadataModel;
        private readonly ResourceModel _resourceModel;
        private readonly Util _util;

        public MetadataController()
        {
            _authenticator = new Authenticator(this, Program.Configuration);
            _metadataModel = new MetadataModel();
            _resourceModel = new ResourceModel();
            _util = new Util();
        }

        [Route("[controller]")]
        public IActionResult Index()
        {
            return Ok(_authenticator.ValidateAndExecute((user) =>
            {
                return NoContent();
            }));
        }

        [HttpGet("[controller]/resource/{resourceId}/ap/{applicationProfileId}")]
        public IActionResult GetApplicationProfile(string resourceId, string applicationProfileId)
        {
            var user = _authenticator.GetUserFromToken();

            var resource = _resourceModel.GetById(Guid.Parse(resourceId));
            if (_metadataModel.IsProjectMember(user, resource))
            {
                var graph = _util.GetGraph(HttpUtility.UrlDecode(applicationProfileId));
                var fixedValuesGraph = new Graph();

                fixedValuesGraph.LoadFromString(resource.FixedValues, new RdfJsonParser());

                graph.Merge(fixedValuesGraph);

                var json = JToken.Parse(VDS.RDF.Writing.StringWriter.Write(graph, new RdfJsonWriter()));
                
                return Ok(json);
            }
            else
            {
                throw new NotAuthorizedException("User is no project member!");
            }

        }

        [HttpGet("[controller]/resource/{resourceId}/aplist/")]
        public IActionResult ListAllApplicationProfiles(string resourceId)
        {
            return Ok(_authenticator.ValidateAndExecute((user) =>
            {
                var resource = _resourceModel.GetById(Guid.Parse(resourceId));
                if (_metadataModel.IsProjectMember(user, resource))
                {
                    var graphUris = _util.ListGraphs();

                    return new JArray(graphUris.Select(x => x.ToString()).Where(x => x.StartsWith("https://purl.org/coscine/ap/")));
                }
                else
                {
                    throw new NotAuthorizedException("User is no project member!");
                }
            }));
        }

        [HttpGet("[controller]/resource/{resourceId}/filename/{filename}/ver/{version}")]
        public IActionResult GetMetadataForFile(string resourceId, string filename, string version)
        {
            return Ok(_authenticator.ValidateAndExecute((user) =>
            {
                var resource = _resourceModel.GetById(Guid.Parse(resourceId));
                if (_metadataModel.IsProjectMember(user, resource))
                {
                    var id = _metadataModel.GenerateId(resourceId, filename, version);
                    var graph = _util.GetGraph(id);
                    return JToken.Parse(VDS.RDF.Writing.StringWriter.Write(graph, new RdfJsonWriter()));
                }
                else
                {
                    throw new NotAuthorizedException("User is no project member!");
                }
            }));
        }

        [HttpPut("[controller]/resource/{resourceId}/filename/{filename}/ver/{version}")]
        public IActionResult StoreMetadataForFile(string resourceId, string filename, string version)
        {
            return Ok(_authenticator.ValidateAndExecute((user) =>
            {
                var innerBlock = ObjectFactory<JToken>.DeserializeFromStream(Request.Body);
                var graphName = _metadataModel.GenerateId(resourceId, filename, version);
                var graphNameUri = new Uri(graphName);
                var json = new JObject
                {
                    [graphName] = innerBlock
                };

                var resource = _resourceModel.GetById(Guid.Parse(resourceId));
                if (_metadataModel.IsProjectMember(user, resource))
                {
                    var graph = new Graph();
                    graph.LoadFromString(json.ToString(), new RdfJsonParser());

                    var fixedValuesGraph = new Graph();
                    fixedValuesGraph.LoadFromString(resource.FixedValues, new RdfJsonParser());

                    foreach(var triple in fixedValuesGraph.Triples.Where(x => x.Predicate.ToString() == "https://purl.org/coscine/fixedValue"))
                    {
                        // Remove any existing triples
                        foreach (var triple2 in graph.GetTriplesWithSubjectPredicate(graph.CreateUriNode(graphNameUri), triple.Subject).ToList())
                        {
                            graph.Retract(triple2);
                        }
                        graph.Assert(graph.CreateUriNode(graphNameUri), triple.Subject, triple.Object);
                    }

                    // Default values is not checked or added

                    // validate the data
                    if (_util.ValidateShacl(graph, graphNameUri))
                    {
                        // store the data
                        if (_util.HasGraph(graphNameUri))
                        {
                            _util.ClearGraph(graphNameUri);
                        }
                        else
                        {
                            _util.CreateNamedGraph(graphNameUri);
                        }

                        // BaseUri must be set for the sparql query
                        graph.BaseUri = graphNameUri;
                        _util.AddGraph(graph);

                        return NoContent();
                    }
                    else
                    {
                        throw new NotAuthorizedException("Data has the wrong format!");
                    }

                }
                else
                {
                    throw new NotAuthorizedException("User is no project member!");
                }
            }));
        }

        [HttpGet("[controller]/vocabulary/{resourceId}/{path}")]
        public IActionResult GetVocabulary(string resourceId, string path)
        {
            return Ok(_authenticator.ValidateAndExecute((user) =>
            {
                var resource = _resourceModel.GetById(Guid.Parse(resourceId));
                if (_metadataModel.IsProjectMember(user, resource))
                {
                    var graph = _util.GetGraph(HttpUtility.UrlDecode(path));

                    JArray de = new JArray();
                    foreach (var kv in _util.GetVocabularyLabels(graph, "de"))
                    {
                        JObject obj = new JObject
                        {
                            ["value"] = kv.Key,
                            ["name"] = kv.Value
                        };
                        de.Add(obj);
                    }

                    JArray en = new JArray();
                    foreach(var kv in _util.GetVocabularyLabels(graph, "en"))
                    {
                        JObject obj = new JObject
                        {
                            ["value"] = kv.Key,
                            ["name"] = kv.Value
                        };
                        en.Add(obj);
                    }

                    JObject json = new JObject
                    {
                        ["de"] = de,
                        ["en"] = en
                    };

                    return json;
                }
                else
                {
                    throw new NotAuthorizedException("User is no project member!");
                }
            }));
        }

    }
}