iiif-processor/dist/chunk-F4YR7VB6.mjs.map

IIIF 2.1 & 3.0 Image API modules for NodeJS

{"version":3,"sources":["../src/error.ts","../src/calculator/base.ts","../src/calculator/v2.ts","../src/calculator/v3.ts"],"sourcesContent":["export class IIIFError extends Error {\n  statusCode?: number;\n\n  constructor (message: string, opts: { statusCode?: number } = {}) {\n    super(message);\n    this.statusCode = opts.statusCode;\n  }\n}\n\nexport default IIIFError;\n","import Debug from 'debug';\nimport { IIIFError } from '../error';\nimport type { BoundingBox, Dimensions, MaxDimensions } from '../types';\nimport type { Calculated, CalculatorOptions } from '../contracts';\n\nconst debug = Debug('iiif-processor:calculator');\n\nexport type ValidatorKey = 'quality' | 'format' | 'region' | 'size' | 'rotation' | 'density';\nexport type ValidatorMap = Record<ValidatorKey, string[]>;\n\nconst IR = '\\\\d+';\nconst FR = '\\\\d+(?:\\\\.\\\\d+)?';\nconst PCTR = /^pct:(?<val>[\\d.,]+)/;\n\nexport const Formats = ['gif', 'jpg', 'tif', 'png', 'webp'];\nexport const Qualities = ['color', 'gray', 'bitonal', 'default'];\n\n\nconst extraFormats = ['jpeg', 'tiff'];\n\nconst Validators: ValidatorMap = {\n  quality: Qualities,\n  format: [...Formats, ...extraFormats],\n  region: ['full', 'square', `pct:${FR},${FR},${FR},${FR}`, `${IR},${IR},${IR},${IR}`],\n  size: ['full', 'max', `pct:${FR}`, `${IR},`, `,${IR}`, `\\\\!?${IR},${IR}`],\n  rotation: [`\\\\!?${FR}`],\n  density: []\n};\n\ntype SizeDesc = { width?: number | null; height?: number | null; fit?: 'fill' | 'inside' };\ntype CanonicalInfo = { region: 'full' | BoundingBox; size: 'full' | 'max' | string; rotation: string; quality: string; format: string };\ntype ParsedInfo = { region: BoundingBox; size: SizeDesc; rotation: { flop: boolean; degree: number }; quality: string; format: { type: string; density?: number }; upscale: boolean };\n\nfunction validateDensity (v: unknown) {\n  debug('validating density %s', v);\n  if (v === null) return true;\n  if (v === undefined) return true;\n  if (typeof v !== 'number' || v < 0) {\n    throw new IIIFError(`Invalid density value: ${v}`);\n  }\n  return true;\n}\n\nexport class Base {\n  protected dims: Dimensions;\n  protected opts: { max?: MaxDimensions };\n  protected _canonicalInfo: CanonicalInfo;\n  protected _parsedInfo: ParsedInfo;\n  protected _sourceDims: Dimensions;\n\n  static _matchers(): typeof Validators {\n    return Validators;\n  }\n\n  static _validator(type: ValidatorKey) {\n    const result = this._matchers()[type].join('|');\n    return `(?<${type}>${result})`;\n  }\n\n  static parsePath(path: string) {\n    path = decodeURIComponent(path);\n    debug('parsing IIIF path: %s', path);\n    const idOnlyRe = new RegExp('^/?(?<id>.+)/?$');\n    const infoJsonRe = new RegExp('^/?(?<id>.+)/(?<info>info.json)$');\n    const transformRe = new RegExp(\n      '^/?(?<id>.+)/(?<region>.+)/(?<size>.+)/(?<rotation>.+)/(?<quality>.+)\\\\.(?<format>.+)$'\n    );\n\n    let result = infoJsonRe.exec(path)?.groups;\n    debug('info.json match result: %j', result);\n    if (result) return result;\n\n    result = transformRe.exec(path)?.groups;\n    debug('transform match result: %j', result);\n    if (result) {\n      for (const component of [\n        'region',\n        'size',\n        'rotation',\n        'quality',\n        'format'\n      ] as ValidatorKey[]) {\n        const validator = new RegExp(this._validator(component));\n        if (!validator.test(result[component] as string)) {\n          throw new IIIFError(`Invalid ${component} in IIIF path: ${path}`, {\n            statusCode: 400\n          });\n        }\n      }\n      return result;\n    }\n\n    result = idOnlyRe.exec(path)?.groups;\n    debug('ID only match result: %j', result);\n    if (result) return result;\n\n    throw new IIIFError(`Not a valid IIIF path: ${path}`, {\n      statusCode: 400\n    });\n  }\n\n  constructor(dims: Dimensions, opts: CalculatorOptions = {}) {\n    this.dims = { ...dims };\n    this.opts = { ...opts };\n    this._sourceDims = { ...dims };\n    this._canonicalInfo = {\n      region: 'full',\n      size: 'full',\n      rotation: '0',\n      quality: 'default',\n      format: 'jpg'\n    };\n    this._parsedInfo = {\n      region: { left: 0, top: 0, ...dims },\n      size: { width: dims.width, height: dims.height, fit: 'fill' },\n      rotation: { flop: false, degree: 0 },\n      quality: 'default',\n      format: { type: 'jpg' },\n      upscale: true\n    };\n  }\n\n  protected _validate(type: keyof typeof Validators | 'density', v: unknown) {\n    if (type === 'density') return validateDensity(v);\n    const re = new RegExp(`^${Base._validator(type)}$`);\n    debug('validating %s %s against %s', type, v, re);\n    if (!re.test(String(v))) {\n      throw new IIIFError(`Invalid ${type}: ${v}`, { statusCode: 400 });\n    }\n    return true;\n  }\n\n  region(v: string) {\n    this._validate('region', v);\n    const pct = PCTR.exec(v);\n    let isFull = false;\n    if (v === 'full') {\n      this._parsedInfo.region = { left: 0, top: 0, ...this.dims };\n      isFull = true;\n    } else if (v === 'square') {\n      this._parsedInfo.region = regionSquare(this.dims);\n    } else if (pct) {\n      this._parsedInfo.region = regionPct(pct.groups?.val as string, this.dims);\n    } else {\n      this._parsedInfo.region = regionXYWH(v);\n    }\n    this._canonicalInfo.region = isFull ? 'full' : this._parsedInfo.region;\n    this._constrainRegion();\n    return this;\n  }\n\n  size(v: string) {\n    this._validate('size', v);\n    const pct = PCTR.exec(v);\n    let isMax = false;\n    if (['full', 'max'].includes(v)) {\n      this._setSize(this._parsedInfo.region);\n      isMax = true;\n    } else if (pct) {\n      this._setSize(\n        sizePct(pct.groups?.val as string, this._parsedInfo.region)\n      );\n    } else {\n      this._setSize(sizeWH(v));\n    }\n    this._canonicalInfo.size = isMax ? v : this._canonicalSize();\n    return this;\n  }\n\n  rotation(v: string) {\n    this._validate('rotation', v);\n    this._canonicalInfo.rotation = v;\n    this._parsedInfo.rotation = {\n      flop: v[0] === '!',\n      degree: Number(v.replace(/^!/, ''))\n    };\n    return this;\n  }\n\n  quality(v: string) {\n    this._validate('quality', v);\n    this._canonicalInfo.quality = v;\n    this._parsedInfo.quality = v;\n    return this;\n  }\n\n  format(v: string, density?: number) {\n    this._validate('format', v);\n    this._validate('density', density);\n    this._canonicalInfo.format = v;\n    this._parsedInfo.format = { type: v, density };\n    return this;\n  }\n\n  info(): Calculated {\n    return {\n      ...this._parsedInfo,\n      fullSize: fullSize(this._sourceDims, this._parsedInfo)\n    } as Calculated;\n  }\n\n  canonicalPath() {\n    const { region, size, rotation, quality, format } = this._canonicalInfo;\n    return `${region}/${size}/${rotation}/${quality}.${format}`;\n  }\n\n  protected _setSize(v: BoundingBox | SizeDesc) {\n    const max: MaxDimensions = { ...(this.opts?.max || {}) };\n    max.height = max.height || max.width;\n    this._parsedInfo.size =\n      'left' in v\n        ? { width: v.width, height: v.height, fit: 'fill' }\n        : { ...v };\n    this._constrainSize(max);\n    return this;\n  }\n\n  protected _constrainSize(constraints: MaxDimensions) {\n    const full = fullSize(this._sourceDims, this._parsedInfo);\n    const constraint = minNum(\n      constraints.width / full.width,\n      constraints.height / full.height,\n      constraints.area / (full.width * full.height)\n    );\n    if (constraint < 1) {\n      if (this._parsedInfo.size.width) {\n        this._parsedInfo.size.width = Math.floor(\n          this._parsedInfo.size.width * constraint\n        );\n      }\n      if (this._parsedInfo.size.height) {\n        this._parsedInfo.size.height = Math.floor(\n          this._parsedInfo.size.height * constraint\n        );\n      }\n    }\n  }\n\n  protected _canonicalSize() {\n    const { width, height } = this._parsedInfo.size;\n    const result = `${width},${height}`;\n    return this._parsedInfo.size.fit === 'inside' ? `!${result}` : result;\n  }\n\n  protected _constrainRegion() {\n    let { left, top, width, height } = this._parsedInfo.region;\n    left = Math.max(left, 0);\n    top = Math.max(top, 0);\n    if (left > this.dims.width || top > this.dims.height) {\n      throw new IIIFError('Region is out of bounds', { statusCode: 400 });\n    }\n    width = Math.min(width, this.dims.width - left);\n    height = Math.min(height, this.dims.height - top);\n    this._parsedInfo.region = { left, top, width, height };\n  }\n}\n\nfunction minNum(...args: unknown[]) {\n  const nums = args.filter((arg) => typeof arg === 'number' && !isNaN(arg));\n  return Math.min(...(nums as number[]));\n}\n\nfunction fillMissingDimension(size: SizeDesc, aspect: number) {\n  if (!size.width && size.height != null)\n    size.width = Math.floor(size.height * aspect);\n  if (!size.height && size.width != null)\n    size.height = Math.floor(size.width / aspect);\n}\n\nfunction fullSize(dims: Dimensions, { region, size }: ParsedInfo) {\n  const regionAspect = region.width / region.height;\n  fillMissingDimension(size, regionAspect);\n  const scaleFactor = (size.width as number) / region.width;\n  const result = {\n    width: Math.floor(dims.width * scaleFactor),\n    height: Math.floor(dims.height * scaleFactor)\n  };\n  debug(\n    'Region %j at size %j yields full size %j, a scale factor of %f',\n    region,\n    size,\n    result,\n    scaleFactor\n  );\n  return result;\n}\n\nfunction regionSquare(dims: Dimensions): BoundingBox {\n  let result: BoundingBox = {\n    left: 0,\n    top: 0,\n    width: dims.width,\n    height: dims.height\n  };\n  if (dims.width !== dims.height) {\n    const side = Math.min(dims.width, dims.height);\n    result = { ...result, width: side, height: side };\n    const offset = Math.abs(Math.floor((dims.width - dims.height) / 2));\n    if (dims.width > dims.height) {\n      result.left = offset;\n      result.top = 0;\n    } else {\n      result.left = 0;\n      result.top = offset;\n    }\n  }\n  return result;\n}\n\nfunction regionPct(v: string, dims: Dimensions): BoundingBox {\n  let x: number, y: number, w: number, h: number;\n  [x, y, w, h] = v.split(/\\s*,\\s*/).map((pct) => Number(pct) / 100.0) as [\n    number,\n    number,\n    number,\n    number\n  ];\n  [x, w] = [x, w].map((val) => Math.floor(dims.width * val)) as [\n    number,\n    number\n  ];\n  [y, h] = [y, h].map((val) => Math.floor(dims.height * val)) as [\n    number,\n    number\n  ];\n  return regionXYWH([x, y, w, h]);\n}\n\nfunction regionXYWH(v: string | number[]): BoundingBox {\n  const parts: number[] =\n    typeof v === 'string' ? v.split(/\\s*,\\s*/).map((val) => Number(val)) : v;\n  const result: BoundingBox = {\n    left: parts[0],\n    top: parts[1],\n    width: parts[2],\n    height: parts[3]\n  };\n  if (result.width === 0 || result.height === 0) {\n    throw new IIIFError('Region width and height must both be > 0', {\n      statusCode: 400\n    });\n  }\n  return result;\n}\n\nfunction sizePct(v: string, dims: Dimensions) {\n  const pct = Number(v);\n  if (isNaN(pct) || pct <= 0) {\n    throw new IIIFError(`Invalid resize %: ${v}`, { statusCode: 400 });\n  }\n  const width = Math.floor(dims.width * (pct / 100.0));\n  return sizeWH(`${width},`);\n}\n\nfunction sizeWH(v: string) {\n  const result: SizeDesc = { fit: 'fill' };\n  if (v[0] === '!') {\n    result.fit = 'inside';\n    v = v.slice(1);\n  }\n  const parts: (number | null)[] = v\n    .split(/\\s*,\\s*/)\n    .map((val) => (val === '' ? null : Number(val)));\n  [result.width, result.height] = parts as [number | null, number | null];\n  if (result.width === 0 || result.height === 0) {\n    throw new IIIFError('Resize width and height must both be > 0', {\n      statusCode: 400\n    });\n  }\n  return result;\n}\n\nexport default { Base, Qualities, Formats };\n","import { Base } from './base';\n\nexport class Calculator extends Base {}\n\nexport * from './base';\n\nexport default { Calculator };\n","import { CalculatorOptions } from '../contracts';\nimport { Base, ValidatorMap } from './base';\nimport { IIIFError } from '../error';\n\nexport class Calculator extends Base {\n  static _matchers(): ValidatorMap {\n    const result: ValidatorMap = { ...super._matchers() };\n    result.size = [...result.size].reduce(\n      (sizes: string[], pattern: string) => {\n        if (pattern !== 'full') sizes.push(`\\\\^?${pattern}`);\n        return sizes;\n      },\n      [] as string[]\n    );\n    return result;\n  }\n\n  constructor(\n    dims: { width: number; height: number },\n    opts: CalculatorOptions = {}\n  ) {\n    super(dims, opts);\n    this._canonicalInfo.size = 'max';\n    this._parsedInfo.upscale = false;\n  }\n\n  size(v: string) {\n    if (v[0] === '^') {\n      this._parsedInfo.upscale = true;\n      v = v.slice(1, v.length);\n    }\n    super.size(v);\n    const { region, size, upscale } = this._parsedInfo;\n    if (!upscale) {\n      if (size.width > region.width || size.height > region.height) {\n        throw new IIIFError('Requested size requires upscaling', {\n          statusCode: 400\n        });\n      }\n    }\n    return this;\n  }\n}\n\nexport * from './base';\n\nexport default { Calculator 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