IIIF-net

This repo contains a collection of POCO's for modelling various IIIF APIs.

The different APIs are split by namespace containing name and version.

E.g. IIIF.Auth.V1, IIIF.Presentation.V2, IIIF.Presentation.V3.

Model Notes

Strongly typed models generally have public properties that map to possible properties as detailed in the relevant IIIF spec, however there are a few differences to this:

Canvas

To serialise a Presentation3 Canvas object as "id" only when used as Annotation.Target there are 2 approaches:

• Have a "simple" canvas object, which has no height, width or items.
• Explicitly set canvas.SerialiseTargetAsId = true, this allows reuse of a full Canvas object.

E.g. The following would both serialise to "target": "http://iiif-net.example/canvas1"

# "Simple" canvas
myAnno.Target = new Canvas{ Id = "http://iiif-net.example/canvas1" };

# Full canvas with SerialiseTargetAsId set
myAnno.Target = new Canvas
    { 
        Id = "http://iiif-net.example/canvas1",
        Width = 100,
        Height = 200,
        SerialiseTargetAsId = true,
        Items = new List<AnnotationPage>{ new AnnotationPage() } 
    };

ImageService2

To conform with https://iiif.io/api/image/2.1/#technical-properties, ImageService2 has a Profile and ProfileDescription properties.

These 2 properties are serialised to (and deserialised from) as single "profile" property, e.g.:

var imageService = new ImageService2
{
    Id = "https://example",
    Profile = "http://iiif.io/api/image/2/level0.json",
    ProfileDescription = new ProfileDescription
    {
        Formats = new[] { "jpg", "png" }, 
        Qualities = new[] { "color" },
        Supports = new[] { "sizeByWhListed" }
    }
};

will output

{
  "@id": "https://example",
  "@type": "ImageService2",
  "profile": [
    "http://iiif.io/api/image/2/level0.json",
    {
      "formats": ["jpg", "png"],
      "qualities": ["color"],
      "supports": ["sizeByWhListed"]
    }
  ]
}

Serialisation

newtonsoft is used to aid serialisation of objects.

The .Serialisation namespace contains a number of custom JsonConverter implementations, some of which can be driven by decorating properties with attributes.

• [ObjectIfSingle] - used on IEnumerable<T> properties. Will render a single object if .Count == 1, else will render an array.
• [RequiredOutput] - used on IEnumerable<T> properties. Will output [] if collection is empty (default is to omit empty lists).
• [CamelCaseEnumAttribute] - use on an enum property to output value as camelCase (e.g. "MissingCredentials" -> "missingCredentials")

Helpers

Serialisation

IIIFSerialiserX contains 2 extension methods for JsonLdBase that help with serialising / deserialising models.

For string serialisation these are AsJson and FromJson<TTarget>:

// Serialisation
string jsonManifest = manifest.AsJson();

// Deserialisation
Manifest deserialisedManifest = jsonManifest.FromJson<Manifest>();

For Stream serialisation these are AsJsonStream and FromJsonStream<TTarget>:

// Serialisation
var memoryStream = new MemoryStream();
Stream jsonManifest = manifest.AsJsonStream(memoryStream);

// Deserialisation
Manifest deserialisedManifest = streamContainingManifest.FromJsonStream<Manifest>();

Important

Full object deserialisation is incomplete - open an issue or PR if you find something unsupported.

HTML Markup Handling

HtmlSanitiser contains a SanitiseHtml() extension method on string to help sanitise HTML.

string original = "<p>my markup<div>invalid</div><p>";
string safe = original.SanitiseHtml();

See IIIF Presentation 3.0 docs for details on html markup.

Note: The rules around markup differs between Presentation 2.1 and 3.0. This method uses 3.0 which permits a couple of tags not mentioned in 2.1 (small, sub and sup).

Local Build

The local_build.sh bash script will build/test/pack for ease of testing.

# build version 1.0.0
$ bash local_build.sh

# build version 1.2.3
$ bash local_build.sh -v 1.2.3

Deployment

New nuget package is published whenever a new version tag is pushed, using gitversion to derive the version number.