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const mime = require('mime-types');
const transform = require('./lib/transform');
const IIIFError = require('./lib/error');
const filenameRe = /(color|gray|bitonal|default)\.(jpe?g|tiff?|gif|png|webp)/;
function parseUrl (url) {
const result = {};
const segments = url.split('/');
result.filename = segments.pop();
if (result.filename.match(filenameRe)) {
result.rotation = segments.pop();
result.size = segments.pop();
result.region = segments.pop();
result.quality = RegExp.$1;
result.format = RegExp.$2;
}
result.id = decodeURIComponent(segments.pop());
result.baseUrl = segments.join('/');
return result;
}
class Processor {
constructor (url, streamResolver, ...args) {
const opts = this.parseOpts(args);
this
.initialize(url, streamResolver)
.setOpts(opts);
if (!filenameRe.test(this.filename) && this.filename !== 'info.json') {
throw new IIIFError(`Invalid IIIF URL: ${url}`);
}
if (typeof streamResolver !== 'function') {
throw new IIIFError('streamResolver option must be specified');
}
}
parseOpts (args) {
if (args.length >= 1 && typeof args[0] === 'function') {
console.warn('Passing dimensionFunction, maxWidth, and includeMetadata as separate parameters is deprecated. Please see the documentation.');
return {
dimensionFunction: args.shift(),
maxWidth: args.shift(),
includeMetadata: args.shift()
};
} else if (args.length === 1 && typeof args[0] === 'object') {
return args[0];
} else {
return {};
}
}
setOpts (opts) {
this.errorClass = IIIFError;
this.dimensionFunction = opts.dimensionFunction || this.defaultDimensionFunction;
this.maxWidth = opts.maxWidth;
this.includeMetadata = !!opts.includeMetadata;
this.density = opts.density || null;
return this;
}
initialize (url, streamResolver) {
let params = url;
if (typeof url === 'string') {
params = parseUrl(params);
}
Object.assign(this, params);
this.streamResolver = streamResolver;
if (this.quality && this.format) {
this.filename = [this.quality, this.format].join('.');
}
return this;
}
async withStream (id, callback) {
Iif (this.streamResolver.length === 2) {
return await this.streamResolver(id, callback);
} else {
const stream = await this.streamResolver(id);
return await callback(stream);
}
}
async defaultDimensionFunction (id) {
return await this.withStream(id, async (stream) => {
return await probe(stream);
});
}
async dimensions () {
const fallback = this.dimensionFunction !== this.defaultDimensionFunction;
if (!this.sizeInfo) {
let dims = await this.dimensionFunction(this.id);
if (fallback && !dims) {
console.warn(`Unable to get dimensions for ${this.id} using custom function. Falling back to probe().`);
dims = await this.defaultDimensionFunction(this.id);
}
this.sizeInfo = dims;
}
return this.sizeInfo;
}
async infoJson () {
const dim = await this.dimensions();
const sizes = [];
for (let size = [dim.width, dim.height]; size.every((x) => x >= 64); size = size.map((x) => Math.floor(x / 2))) {
sizes.push({ width: size[0], height: size[1] });
}
const doc = this.infoDoc(dim, sizes);
Iif (this.maxWidth) doc.profile[1].maxWidth = this.maxWidth;
return { contentType: 'application/json', body: JSON.stringify(doc) };
}
infoDoc (dim, sizes) {
return {
'@context': 'http://iiif.io/api/image/2/context.json',
'@id': [this.baseUrl, encodeURIComponent(this.id)].join('/'),
protocol: 'http://iiif.io/api/image',
width: dim.width,
height: dim.height,
sizes: sizes,
tiles: [
{
width: 512,
height: 512,
scaleFactors: sizes.map((_v, i) => 2 ** i)
}
],
profile: [
'http://iiif.io/api/image/2/level2.json',
{
formats: transform.Formats,
qualities: transform.Qualities,
supports: ['regionByPx', 'sizeByW', 'sizeByWhListed', 'cors', 'regionSquare', 'sizeByDistortedWh', 'sizeAboveFull', 'canonicalLinkHeader', 'sizeByConfinedWh', 'sizeByPct', 'jsonldMediaType', 'regionByPct', 'rotationArbitrary', 'sizeByH', 'baseUriRedirect', 'rotationBy90s', 'profileLinkHeader', 'sizeByForcedWh', 'sizeByWh', 'mirroring']
}
]
};
}
pipeline (dim) {
return new transform.Operations(dim)
.region(this.region)
.size(this.size)
.rotation(this.rotation)
.quality(this.quality)
.format(this.format, this.density)
.withMetadata(this.includeMetadata).pipeline;
}
async iiifImage () {
try {
const dim = await this.dimensions();
const pipeline = this.pipeline(dim);
const result = await this.withStream(this.id, async (stream) => {
return await stream.pipe(pipeline).toBuffer();
});
return { contentType: mime.lookup(this.format), body: result };
} catch (err) {
throw new IIIFError(`Unhandled transformation error: ${err.message}`);
}
}
async execute () {
try {
if (this.filename === 'info.json') {
return this.infoJson();
} else {
return this.iiifImage();
}
} catch (err) {
console.log('Caught while executing', err.message);
}
}
}
module.exports = { Processor, IIIFError };
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