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iiif.ts
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iiif.ts
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import {
Image1Schema,
Image2Schema,
Image3Schema,
// TODO: add Canvas!
Manifest2Schema,
Manifest3Schema,
Collection2Schema,
Collection3Schema
} from '../schemas/iiif.js'
import { Image1ContextString } from '../schemas/image.1.js'
import { Image } from './image.js'
import { Manifest } from './manifest.js'
import { Collection } from './collection.js'
import type { MajorVersion } from '../lib/types.js'
/**
* Base class that contains a static parse function for IIIF resources
*/
export class IIIF {
/**
* Parses as IIIF resource and returns a class containing the parsed version
* @param {any} iiifResource - Source data of a IIIF resource
* @param {MajorVersion} [majorVersion=null] - IIIF API version of resource. If not provided, it will be determined automatically
* @returns {Image | Manifest | Collection} Parsed IIIF resource
* @static
*/
static parse(
iiifResource: unknown,
majorVersion: MajorVersion | null = null
) {
if (iiifResource && typeof iiifResource === 'object') {
if (
majorVersion === 1 ||
('@context' in iiifResource &&
iiifResource['@context'] === Image1ContextString)
) {
const parsedImage = Image1Schema.parse(iiifResource)
return new Image(parsedImage)
} else if (majorVersion === 2 || '@id' in iiifResource) {
if (
'protocol' in iiifResource &&
iiifResource.protocol === 'http://iiif.io/api/image'
) {
const parsedImage = Image2Schema.parse(iiifResource)
return new Image(parsedImage)
} else if (
'@type' in iiifResource &&
iiifResource['@type'] === 'sc:Manifest'
) {
const parsedManifest = Manifest2Schema.parse(iiifResource)
return new Manifest(parsedManifest)
} else if (
'@type' in iiifResource &&
iiifResource['@type'] === 'sc:Collection'
) {
const parsedCollection = Collection2Schema.parse(iiifResource)
return new Collection(parsedCollection)
}
} else if (majorVersion === 3 || 'id' in iiifResource) {
if (
'protocol' in iiifResource &&
iiifResource.protocol === 'http://iiif.io/api/image'
) {
const parsedImage = Image3Schema.parse(iiifResource)
return new Image(parsedImage)
} else if ('type' in iiifResource && iiifResource.type === 'Manifest') {
const parsedManifest = Manifest3Schema.parse(iiifResource)
return new Manifest(parsedManifest)
} else if (
'type' in iiifResource &&
iiifResource.type === 'Collection'
) {
const parsedCollection = Collection3Schema.parse(iiifResource)
return new Collection(parsedCollection)
}
}
}
// TODO: improve error message
throw new Error('Invalid IIIF data or unsupported IIIF type')
}
}