iiif-processor/dist/index.mjs.map

IIIF 2.1 & 3.0 Image API modules for NodeJS

{"version":3,"sources":["../src/processor.ts","../src/transform.ts","../src/v2/index.ts","../src/v2/info.ts","../src/v3/index.ts","../src/v3/info.ts","../src/versions.ts"],"sourcesContent":["import Debug from 'debug';\nimport mime from 'mime-types';\nimport path from 'path';\nimport sharp from 'sharp';\nimport { Operations } from './transform';\nimport { IIIFError } from './error';\nimport Versions from './versions';\nimport type {\n  Dimensions,\n  MaxDimensions,\n  ProcessorResult,\n  ResolvedDimensions,\n  ContentResult,\n  ErrorResult,\n  RedirectResult\n} from './types';\nimport type { VersionModule } from './contracts';\n\nconst debug = Debug('iiif-processor:main');\nconst debugv = Debug('verbose:iiif-processor');\n\nconst defaultpathPrefix = '/iiif/{{version}}/';\n\nfunction getIiifVersion(url: string, template: string) {\n  const { origin, pathname } = new URL(url);\n  const templateMatcher = template.replace(\n    /\\{\\{version\\}\\}/,\n    '(?<iiifVersion>\\\\d+)'\n  );\n  const pathMatcher = `^(?<prefix>${templateMatcher})(?<request>.+)$`;\n  const re = new RegExp(pathMatcher);\n  const parsed = re.exec(pathname);\n  if (parsed) {\n    parsed.groups.prefix = origin + parsed.groups.prefix;\n    return { ...parsed.groups } as {\n      prefix: string;\n      iiifVersion: string;\n      request: string;\n    };\n  } else {\n    throw new IIIFError('Invalid IIIF path');\n  }\n}\n\nexport type DimensionFunction = (input: {\n  id: string;\n  baseUrl: string;\n}) => Promise<Dimensions | Dimensions[]>;\nexport type StreamResolver = (input: {\n  id: string;\n  baseUrl: string;\n}) => Promise<NodeJS.ReadableStream>;\nexport type StreamResolverWithCallback = (\n  input: { id: string; baseUrl: string },\n  callback: (stream: NodeJS.ReadableStream) => Promise<unknown>\n) => Promise<unknown>;\nexport type ProcessorOptions = {\n  dimensionFunction?: DimensionFunction;\n  max?: { width: number; height?: number; area?: number };\n  includeMetadata?: boolean;\n  density?: number;\n  debugBorder?: boolean;\n  iiifVersion?: number;\n  pageThreshold?: number;\n  pathPrefix?: string;\n  sharpOptions?: Record<string, unknown>;\n  request?: string;\n};\n\nexport class Processor {\n  private errorClass = IIIFError;\n  private Implementation!: VersionModule;\n  private sizeInfo?: Dimensions[];\n  private sharpOptions?: Record<string, unknown>;\n\n  id!: string;\n  baseUrl!: string;\n  version!: number;\n  request!: string;\n  streamResolver!: StreamResolver | StreamResolverWithCallback;\n  filename?: string;\n\n  // parsed params from Calculator.parsePath\n  info?: string;\n  region!: string;\n  size!: string;\n  rotation!: string;\n  quality!: string;\n  format!: string;\n\n  // options\n  dimensionFunction!: DimensionFunction;\n  max?: MaxDimensions;\n  includeMetadata = false;\n  density?: number | null;\n  debugBorder = false;\n  pageThreshold?: number;\n\n  constructor(\n    url: string,\n    streamResolver: StreamResolver | StreamResolverWithCallback,\n    opts: ProcessorOptions = {}\n  ) {\n    const { prefix, iiifVersion, request } = getIiifVersion(\n      url,\n      opts.pathPrefix || defaultpathPrefix\n    );\n\n    if (typeof streamResolver !== 'function') {\n      throw new IIIFError('streamResolver option must be specified');\n    }\n\n    if (opts.max?.height && !opts.max?.width) {\n      throw new IIIFError('maxHeight cannot be specified without maxWidth');\n    }\n\n    const defaults = {\n      dimensionFunction: this.defaultDimensionFunction.bind(this),\n      density: null\n    };\n\n    this.setOpts({\n      ...defaults,\n      iiifVersion,\n      ...opts,\n      prefix,\n      request\n    }).initialize(streamResolver);\n  }\n\n  setOpts(opts) {\n    this.dimensionFunction = opts.dimensionFunction;\n    this.max = { ...opts.max };\n    this.includeMetadata = !!opts.includeMetadata;\n    this.density = opts.density;\n    this.baseUrl = opts.prefix;\n    this.debugBorder = !!opts.debugBorder;\n    this.pageThreshold = opts.pageThreshold;\n    this.sharpOptions = { ...opts.sharpOptions };\n    this.version = Number(opts.iiifVersion);\n    this.request = opts.request;\n    return this;\n  }\n\n  initialize(streamResolver: StreamResolver | StreamResolverWithCallback) {\n    this.Implementation = Versions[this.version] as VersionModule;\n    if (!this.Implementation) {\n      throw new IIIFError(\n        `No implementation found for IIIF Image API v${this.version}`\n      );\n    }\n\n    const params = this.Implementation.Calculator.parsePath(this.request);\n    debug('Parsed URL: %j', params);\n    Object.assign(this, params);\n    this.streamResolver = streamResolver;\n\n    if (this.quality && this.format) {\n      this.filename = [this.quality, this.format].join('.');\n    } else if (this.info) {\n      this.filename = 'info.json';\n    }\n    return this;\n  }\n\n  async withStream(\n    { id, baseUrl }: { id: string; baseUrl: string },\n    callback: (s: NodeJS.ReadableStream) => Promise<unknown>\n  ) {\n    debug('Requesting stream for %s', id);\n    if (this.streamResolver.length === 2) {\n      return await (this.streamResolver as StreamResolverWithCallback)(\n        { id, baseUrl },\n        callback\n      );\n    } else {\n      const stream = await (this.streamResolver as StreamResolver)({\n        id,\n        baseUrl\n      });\n      return await callback(stream);\n    }\n  }\n\n  async defaultDimensionFunction({\n    id,\n    baseUrl\n  }: {\n    id: string;\n    baseUrl: string;\n  }): Promise<Dimensions[]> {\n    const result: Dimensions[] = [];\n    let page = 0;\n    const target = sharp({ limitInputPixels: false, page });\n\n    return (await this.withStream({ id, baseUrl }, async (stream) => {\n      stream.pipe(target);\n      const { autoOrient, ...metadata } = await target.metadata();\n      const { width, height, pages } = { ...metadata, ...autoOrient };\n      if (!width || !height) return result;\n      result.push({ width, height });\n      if (!isNaN(pages)) {\n        for (page += 1; page < pages; page++) {\n          const scale = 1 / 2 ** page;\n          result.push({\n            width: Math.floor(width * scale),\n            height: Math.floor(height * scale)\n          });\n        }\n      }\n      return result;\n    })) as Dimensions[];\n  }\n\n  async dimensions(): Promise<Dimensions[]> {\n    const fallback =\n      this.dimensionFunction !== this.defaultDimensionFunction.bind(this);\n\n    if (!this.sizeInfo) {\n      debug(\n        'Attempting to use dimensionFunction to retrieve dimensions for %j',\n        this.id\n      );\n      const params = { id: this.id, baseUrl: this.baseUrl };\n      let dims: ResolvedDimensions = await this.dimensionFunction(params);\n      if (fallback && !dims) {\n        const warning =\n          'Unable to get dimensions for %s using custom function. Falling back to sharp.metadata().';\n        debug(warning, this.id);\n        console.warn(warning, this.id);\n        dims = await this.defaultDimensionFunction(params);\n      }\n      if (!Array.isArray(dims)) dims = [dims];\n      this.sizeInfo = dims as Dimensions[];\n    }\n    return this.sizeInfo;\n  }\n\n  async infoJson() {\n    const [dim] = await this.dimensions();\n    const sizes: Array<{ width: number; height: number }> = [];\n    for (\n      let size = [dim.width, dim.height];\n      size.every((x) => x >= 64);\n      size = size.map((x) => Math.floor(x / 2))\n    ) {\n      sizes.push({ width: size[0], height: size[1] });\n    }\n\n    const uri = new URL(this.baseUrl);\n    // Node's URL has readonly pathname in types; construct via join on new URL\n    uri.pathname = path.join(uri.pathname, this.id);\n    const id = uri.toString();\n    const doc = this.Implementation.infoDoc({\n      id,\n      ...dim,\n      sizes,\n      max: this.max\n    });\n    for (const prop in doc) {\n      if (doc[prop] === null || doc[prop] === undefined) delete doc[prop];\n    }\n\n    const body = JSON.stringify(doc, (_key, value) =>\n      value?.constructor === Set ? [...value] : value\n    );\n    return {\n      type: 'content',\n      contentType: 'application/ld+json',\n      body\n    } as ContentResult;\n  }\n\n  operations(dim: Dimensions[]) {\n    const sharpOpt = this.sharpOptions;\n    const { max, pageThreshold } = this;\n    debug('pageThreshold: %d', pageThreshold);\n    return new Operations(this.version, dim, {\n      sharp: sharpOpt,\n      max,\n      pageThreshold\n    })\n      .region(this.region)\n      .size(this.size)\n      .rotation(this.rotation)\n      .quality(this.quality)\n      .format(this.format, this.density ?? undefined)\n      .withMetadata(this.includeMetadata);\n  }\n\n  async applyBorder(transformed: sharp.Sharp) {\n    const buf = await transformed.toBuffer();\n    const borderPipe = sharp(buf, { limitInputPixels: false });\n    const { width, height } = await borderPipe.metadata();\n    const background = { r: 255, g: 0, b: 0, alpha: 1 };\n\n    const topBorder = {\n      create: { width, height: 1, channels: 4, background } as sharp.Create\n    };\n    const bottomBorder = {\n      create: { width, height: 1, channels: 4, background } as sharp.Create\n    };\n    const leftBorder = {\n      create: { width: 1, height, channels: 4, background } as sharp.Create\n    };\n    const rightBorder = {\n      create: { width: 1, height, channels: 4, background } as sharp.Create\n    };\n\n    return borderPipe.composite([\n      { input: topBorder, left: 0, top: 0 },\n      { input: bottomBorder, left: 0, top: (height as number) - 1 },\n      { input: leftBorder, left: 0, top: 0 },\n      { input: rightBorder, left: (width as number) - 1, top: 0 }\n    ]);\n  }\n\n  async iiifImage() {\n    debugv('Request %s', this.request);\n    const dim = await this.dimensions();\n    const operations = this.operations(dim);\n    debugv('Operations: %j', operations);\n    const pipeline = await operations.pipeline();\n\n    const result = await this.withStream(\n      { id: this.id, baseUrl: this.baseUrl },\n      async (stream) => {\n        debug('piping stream to pipeline');\n        let transformed = await stream.pipe(pipeline);\n        if (this.debugBorder) {\n          transformed = await this.applyBorder(transformed);\n        }\n        debug('converting to buffer');\n        return await transformed.toBuffer();\n      }\n    );\n    debug('returning %d bytes', (result as Buffer).length);\n    debug('baseUrl', this.baseUrl);\n\n    const canonicalUrl = new URL(\n      path.join(this.id, operations.canonicalPath()),\n      this.baseUrl\n    );\n    return {\n      type: 'content',\n      canonicalLink: canonicalUrl.toString(),\n      profileLink: this.Implementation.profileLink,\n      contentType: mime.lookup(this.format) as string,\n      body: result as Buffer\n    } as ContentResult;\n  }\n\n  async execute(): Promise<ProcessorResult> {\n    try {\n      if (this.format === undefined && this.info === undefined) {\n        debug('No format or info.json requested; redirecting to info.json');\n        return {\n          location: new URL(\n            path.join(this.id, 'info.json'),\n            this.baseUrl\n          ).toString(),\n          type: 'redirect'\n        } as RedirectResult;\n      }\n\n      if (this.filename === 'info.json') {\n        return await this.infoJson();\n      }\n\n      return await this.iiifImage();\n    } catch (err) {\n      if (err instanceof IIIFError) {\n        debug('IIIFError caught: %j', err);\n        return {\n          type: 'error',\n          message: err.message,\n          statusCode: err.statusCode || 500\n        } as ErrorResult;\n      } else {\n        throw err;\n      }\n    }\n  }\n}\n\nexport default Processor;\n","import Sharp, { Sharp as SharpType } from 'sharp';\nimport Debug from 'debug';\nimport { Versions } from './versions';\nimport type { VersionModule, CalculatorLike, CalculatorOptions } from './contracts';\nimport type { Dimensions, BoundingBox, Format } from './types';\n\nconst debug = Debug('iiif-processor:transform');\n\nconst DEFAULT_PAGE_THRESHOLD = 1;\nconst SCALE_PRECISION = 10000000;\n\ntype PageDim = { width: number; height: number; page: number };\n\nexport class Operations {\n  private keepMetadata?: boolean;\n  private pages: PageDim[];\n  private sharpOptions?: Record<string, unknown>;\n  private calculator: CalculatorLike;\n  private pageThreshold: number;\n\n  constructor (version: number, dims: Dimensions[], opts: CalculatorOptions & { sharp?: Record<string, unknown>; pageThreshold?: number }) {\n    const { sharp, pageThreshold, ...rest } = { ...opts };\n    const Implementation: VersionModule = Versions[version];\n    this.calculator = new Implementation.Calculator(dims[0], rest);\n    this.pageThreshold = typeof pageThreshold === 'number' ? pageThreshold : DEFAULT_PAGE_THRESHOLD;\n\n    this.pages = dims\n      .map((dim, page) => ({ ...dim, page }))\n      .sort((a, b) => b.width * b.height - a.width * a.height);\n    this.sharpOptions = sharp;\n  }\n\n  region (v: string) {\n    this.calculator.region(v);\n    return this;\n  }\n\n  size (v: string) {\n    this.calculator.size(v);\n    return this;\n  }\n\n  rotation (v: string) {\n    this.calculator.rotation(v);\n    return this;\n  }\n\n  quality (v: string) {\n    this.calculator.quality(v);\n    return this;\n  }\n\n  format (v: string, density?: number) {\n    this.calculator.format(v, density);\n    return this;\n  }\n\n  info () {\n    return this.calculator.info();\n  }\n\n  canonicalPath () {\n    return this.calculator.canonicalPath();\n  }\n\n  withMetadata (v: boolean) {\n    this.keepMetadata = v;\n    return this;\n  }\n\n  private computePage () {\n    const { fullSize } = this.info();\n    const { page } = this.pages.find((_candidate, index) => {\n      const next = this.pages[index + 1];\n      debug('comparing candidate %j to target %j with a %d-pixel buffer', next, fullSize, this.pageThreshold);\n      return !next || (next.width + this.pageThreshold < fullSize.width && next.height + this.pageThreshold < fullSize.height);\n    }) as PageDim;\n\n    const resolution = this.pages[page];\n    const scale = page === 0 ? 1 : Math.round((resolution.width / this.pages[0].width) * SCALE_PRECISION) / SCALE_PRECISION;\n    debug('Using page %d (%j) as source and scaling by %f', page, resolution, scale);\n    return { page, scale };\n  }\n\n  pipeline (): SharpType {\n    const pipeline = Sharp({\n      limitInputPixels: false,\n      ...{ ...this.sharpOptions }\n    });\n    const { page, scale } = this.computePage();\n    (pipeline as any).options.input.page = page; // eslint-disable-line @typescript-eslint/no-explicit-any\n\n    const { format, quality, region, rotation: { flop, degree }, size } = this.info();\n    scaleRegion(region, scale, this.pages[page]);\n\n    pipeline.autoOrient().extract(region).resize(size);\n    if (flop) pipeline.flop();\n    pipeline.rotate(degree);\n    if (quality === 'gray') pipeline.grayscale();\n    if (quality === 'bitonal') pipeline.threshold();\n    setFormat(pipeline, format);\n    if (this.keepMetadata) pipeline.keepMetadata();\n\n    debug('Pipeline: %j', { page, region, size, rotation: { flop, degree }, quality, format });\n    return pipeline;\n  }\n}\n\nfunction setFormat (pipeline: SharpType, format: { type: Format; density?: number }) {\n  let pipelineFormat;\n  const pipelineOptions: any = {}; // eslint-disable-line @typescript-eslint/no-explicit-any\n\n  switch (format.type) {\n    case 'jpeg':\n      pipelineFormat = 'jpg';\n      break;\n    case 'tif':\n      pipelineFormat = 'tiff';\n      if (format.density) {\n        pipelineOptions.xres = format.density / 25.4;\n        pipelineOptions.yres = format.density / 25.4;\n      }\n      break;\n    default:\n      pipelineFormat = format.type;\n  }\n  pipeline.toFormat(pipelineFormat, pipelineOptions);\n  if (format.density) {\n    pipeline.withMetadata({ density: format.density });\n  }\n}\n\nfunction scaleRegion (region: BoundingBox, scale: number, page: { width: number; height: number }) {\n  region.left = Math.floor(region.left * scale);\n  region.top = Math.floor(region.top * scale);\n  region.width = Math.floor(region.width * scale);\n  region.height = Math.floor(region.height * scale);\n  region.left = Math.max(region.left, 0);\n  region.top = Math.max(region.top, 0);\n  region.width = Math.min(region.width, page.width);\n  region.height = Math.min(region.height, page.height);\n  return region;\n}\n\nexport default { Operations };\n","export * from './info';\nexport * from '../calculator/v2';\n","import { Dimensions } from '../types';\nimport { Formats, Qualities } from '../calculator/v2';\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nimport Debug from 'debug';\nimport type { InfoDocInput, InfoDoc } from '../contracts';\nconst profileLink = 'http://iiif.io/api/image/2/level2.json';\n\nconst IIIFProfile = {\n  formats: new Set(Formats),\n  qualities: new Set(Qualities),\n  supports: new Set([\n    'baseUriRedirect',\n    'canonicalLinkHeader',\n    'cors',\n    'jsonldMediaType',\n    'mirroring',\n    'profileLinkHeader',\n    'regionByPct',\n    'regionByPx',\n    'regionSquare',\n    'rotationArbitrary',\n    'rotationBy90s',\n    'sizeAboveFull',\n    'sizeByConfinedWh',\n    'sizeByDistortedWh',\n    'sizeByForcedWh',\n    'sizeByH',\n    'sizeByPct',\n    'sizeByW',\n    'sizeByWh',\n    'sizeByWhListed'\n  ])\n};\n\nexport function infoDoc ({ id, width, height, sizes, max }: InfoDocInput): InfoDoc {\n  const maxAttrs = {\n    maxWidth: max?.width,\n    maxHeight: max?.height,\n    maxArea: max?.area\n  };\n\n  return {\n    '@context': 'http://iiif.io/api/image/2/context.json',\n    '@id': id,\n    protocol: 'http://iiif.io/api/image',\n    width,\n    height,\n    sizes,\n    tiles: [\n      { width: 512, height: 512, scaleFactors: sizes.map((_v: Dimensions, i: number) => 2 ** i) }\n    ],\n    profile: [profileLink, { ...IIIFProfile, ...maxAttrs }]\n  };\n}\n\nexport { profileLink };\n","export * from './info';\nexport * from '../calculator/v3';\n","import { Dimensions } from '../types';\nimport { Formats, Qualities } from '../calculator/v3';\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nimport Debug from 'debug';\nimport type { InfoDocInput, InfoDoc } from '../contracts';\n\nexport const profileLink = 'https://iiif.io/api/image/3/level2.json';\n\nconst defaultFormats: Set<string> = new Set(['jpg', 'png']);\nconst defaultQualities: Set<string> = new Set(['default']);\nconst IIIFExtras = {\n  extraFeatures: [\n    'canonicalLinkHeader',\n    'mirroring',\n    'profileLinkHeader',\n    'rotationArbitrary',\n    'sizeByDistortedWh',\n    'sizeByForcedWh',\n    'sizeByWhListed',\n    'sizeUpscaling'\n  ],\n  extraFormats: new Set(Formats.filter((f) => !defaultFormats.has(f))),\n  extraQualities: new Set(Qualities.filter((q) => !defaultQualities.has(q)))\n};\n\nexport function infoDoc({\n  id,\n  width,\n  height,\n  sizes,\n  max\n}: InfoDocInput): InfoDoc {\n  const maxAttrs = {\n    maxWidth: max?.width,\n    maxHeight: max?.height,\n    maxArea: max?.area\n  };\n\n  return {\n    '@context': 'http://iiif.io/api/image/3/context.json',\n    id,\n    type: 'ImageService3',\n    protocol: 'http://iiif.io/api/image',\n    profile: 'level2',\n    width,\n    height,\n    sizes,\n    tiles: [\n      {\n        width: 512,\n        height: 512,\n        scaleFactors: sizes.map((_v: Dimensions, i: number) => 2 ** i)\n      }\n    ],\n    ...IIIFExtras,\n    ...maxAttrs\n  };\n}\n","import * as v2 from './v2';\nimport * as v3 from './v3';\nimport type { VersionModule } from './contracts';\n\nexport const Versions: Record<2 | 3, VersionModule> = {\n  2: v2 as unknown as VersionModule,\n  3: v3 as unknown as VersionModule\n};\n\nexport default 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