filestack-adaptive
Version:
HTML5 picture elements powered by Filestack
219 lines (217 loc) • 32.1 kB
JavaScript
import { __assign } from "tslib";
import { Filelink } from 'filestack-js';
import utils from './utils';
function isFileHandleByStorageAlias(handle) {
return handle.srcHandle !== undefined;
}
var defaultResolutions = [
180,
360,
540,
720,
900,
1080,
1296,
1512,
1728,
1944,
2160,
2376,
2592,
2808,
3024,
];
/**
* Based on the provided transform options object create filestack filelink
*/
var createFileLink = function (handle, fileLinkOptions) {
var fileLink;
// Use storage alias handle
if (isFileHandleByStorageAlias(handle)) {
fileLink = new Filelink(handle.srcHandle, handle.apiKey);
}
else {
fileLink = new Filelink(handle);
}
// If validator is enabled use only for the first filelink in set
if (!fileLinkOptions.useValidator || (fileLinkOptions.indexInSet && fileLinkOptions.indexInSet > 0)) {
fileLink.setUseValidator(false);
}
Object.keys(fileLinkOptions.transform).sort(outputFirstSort).forEach(function (key) {
fileLink = fileLink.addTask(key, fileLinkOptions.transform[key]);
});
if (fileLinkOptions.cname) {
fileLink.setCname(fileLinkOptions.cname);
}
return fileLink.toString();
};
/**
* Sort array of keys in a way that 'output' is always the first
* @param previousKey - First key to be compared in a sort function
*/
var outputFirstSort = function (previousKey, nextKey) {
return previousKey === 'output' ? -1 : nextKey === 'output' ? 1 : 0;
};
var getWidth = function (width) { return function (resolution) {
if (typeof resolution === 'number') {
return resolution;
}
var unit = utils.getUnit(resolution);
if (unit === 'w') {
return utils.getNumber(resolution);
}
// Pixel density (2x == 2 * size)
return utils.getNumber(width) * utils.getNumber(resolution);
}; };
/**
* Construct Filestack URL out of CDN base and handle, with optional security
*/
var getCdnUrl = function (handle, options) {
var fileLinkOptions = {
transform: Object.assign({}, options.transforms),
useValidator: options.useValidator,
cname: options.cname,
};
return createFileLink(handle, fileLinkOptions);
};
/**
* Constructs a srcset attribute for source and img elements.
* Will use resolution descriptors or pixel densities to construct
* the proper URLs based on the width of the image.
*/
var makeSrcSet = function (handle, options, width, format) {
var fileLinkOptions = {
transform: Object.assign({}, options.transforms),
useValidator: options.useValidator,
cname: options.cname,
};
if (format) {
fileLinkOptions.transform.output = { format: format };
}
if (!width && format) {
return createFileLink(handle, fileLinkOptions);
}
var resolutions = options.resolutions.map(function (val) { return typeof val === 'number' ? val + "w" : val; });
var widths = options.resolutions.map(function (val) {
return getWidth(width)(val);
});
var urls = widths.map(function (width, index) {
fileLinkOptions.indexInSet = index;
fileLinkOptions.transform.resize = { width: width };
return createFileLink(handle, fileLinkOptions);
}, widths);
return urls.map(function (url, index) { return url + " " + resolutions[index]; }).join(', ');
};
/**
* Construct src attribute for img element.
* This may contain a resized URL if a fallback size is provided.
*/
var makeSrc = function (handle, fallback, options) {
var unit = utils.getUnit(fallback);
if (unit === 'vw') {
return getCdnUrl(handle, options);
}
var fileLinkOptions = {
transform: Object.assign({}, options.transforms),
useValidator: options.useValidator,
cname: options.cname,
};
fileLinkOptions.transform.resize = { width: utils.getNumber(fallback) };
return createFileLink(handle, fileLinkOptions);
};
/**
* A source element contains many possible hints for the browser.
* For each media query + size pair we can construct a source
* with the proper srcset using the size as the width parameter.
* For each format a source element can be constructed as well.
* This means there are (sizes × formats) sources.
*
* R.xprod lets us compute the Cartesian product of two lists.
*/
var makeSourcesTree = function (handle, options) {
var makeSource = function (media, width, format) {
if (!format && media === 'fallback') {
return undefined;
}
return utils.removeEmpty({
media: media === 'fallback' ? undefined : media,
sizes: width,
srcSet: makeSrcSet(handle, options, width, format),
type: format ? "image/" + format : undefined,
});
};
// Handle three cases -- sizes + type, just sizes, just type
if (!options.sizes && options.formats) {
var sources_1 = options.formats.map(function (format) { return makeSource(null, null, format); }).filter(function (source) { return !!source; });
return sources_1;
}
var sources = Object.entries(options.sizes);
if (options.formats) {
sources = utils.arrToChunks(utils.flat(utils.cartesian([sources, options.formats]), 2), 3);
}
var sourcesTree = sources.map(function (source) {
return makeSource.apply(null, source);
}).filter(function (source) { return !!source; });
return sourcesTree;
};
/**
* Just your basic HTML img element. However we can let the user specify
* a specific width which will incorporate pixel resolutions options in a srcset.
*/
var makeImgTree = function (handle, options) {
if (options.width) {
return utils.removeEmpty({
src: makeSrc(handle, options.width, options),
srcSet: makeSrcSet(handle, options, options.width),
alt: options.alt,
width: utils.getNumber(options.width),
});
}
var fallback = options.sizes && options.sizes.fallback;
return utils.removeEmpty({
src: fallback ? makeSrc(handle, fallback, options) : getCdnUrl(handle, options),
srcSet: options.sizes ? makeSrcSet(handle, options, fallback) : undefined,
alt: options.alt,
width: options.width,
sizes: fallback || undefined,
});
};
/**
* Represent a picture element as a tree where leaf nodes are attributes
* of one img element and zero or more source elements.
*
* This allows passing the structure into hyperscript-like virtual DOM generators.
* For example see https://github.com/choojs/hyperx
*/
export var makePictureTree = function (handle, opts) {
if (typeof handle !== 'string' && !isFileHandleByStorageAlias(handle)) {
throw new TypeError('Filestack handle must be a string');
}
if (opts && opts.resolutions && opts.resolutions.length) {
var rUnits = opts.resolutions.filter(function (resolution) {
return typeof resolution === 'string';
}).map(function (resolution) {
return utils.getUnit(resolution);
});
if (!opts.sizes && (opts.resolutions.some(function (resolution) { return typeof resolution === 'number'; }) || rUnits.indexOf('w') > -1)) {
throw new Error('You must specify at least one size to use width descriptors');
}
if (!opts.width && rUnits.indexOf('x') > -1) {
throw new Error('You must specify a width to use pixel densities.');
}
}
opts = utils.removeEmpty(opts);
var options = __assign({ resolutions: opts && opts.width ? ['1x', '2x'] : defaultResolutions }, opts);
options.transforms = options.transforms || {}; // ensure transforms are defined
if (options.security) {
options.transforms.security = options.security;
}
var img = makeImgTree(handle, options);
var tree = { img: img };
if (options.sizes || options.formats) {
var sources = makeSourcesTree(handle, options);
tree.sources = sources && sources.length ? sources : undefined;
}
return utils.removeEmpty(tree);
};
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{ TransformOptions, Filelink } from 'filestack-js';\nimport utils from './utils';\n\nexport interface FileLinkOptions {\n  transform: TransformOptions;\n  useValidator?: boolean;\n  indexInSet?: number;\n  cname?: string;\n}\n\nexport interface FileHandleByStorageAlias {\n  srcHandle: string;\n  apiKey: string;\n}\n\nexport type FileHandle = string | FileHandleByStorageAlias;\n\nfunction isFileHandleByStorageAlias(handle: String | FileHandleByStorageAlias | undefined): handle is FileHandleByStorageAlias {\n  return (handle as FileHandleByStorageAlias).srcHandle !== undefined;\n}\n\nexport interface Img {\n  alt?: string;\n  sizes?: string;\n  src: string;\n  srcset?: string;\n  width?: string;\n}\n\nexport interface Source {\n  media?: string;\n  sizes?: string;\n  srcset: string;\n  type?: string;\n  // key?: string;\n}\n\nexport interface Picture {\n  img: Img;\n  sources?: Source[];\n}\n\nexport interface Size {\n  [mediaquery: string]: string;\n}\n\nexport interface Security {\n  policy: string;\n  signature: string;\n}\n\nexport interface PictureOptions {\n  /**\n   * Set if should use validator for params task\n   */\n  useValidator?: boolean;\n  /**\n   * Alt name for image element.\n   */\n  alt?: string;\n  /**\n   * Array of image types, e.g. ['jpg', 'webp'].\n   */\n  formats?: string[];\n  /**\n   * Toggle setting key attribute on sources. Useful for React.\n   * Defaults to true.\n   */\n  keys?: boolean;\n  /**\n   * Resolution descriptors. Defaults to a sensible range\n   * between 180w and 3024w. Can also be numbers representing widths\n   * or strings representing pixel densities, e.g. ['1x', '2x'].\n   */\n  resolutions?: (string | number)[];\n  /**\n   * Object containing Filestack security policy and signature.\n   */\n  security?: Security;\n  /**\n   * Object of sizes and their media query hints.\n   * Note: A fallback for img sizes is highly recommended.\n   * For example:\n   * ```js\n   * sizes: {\n   *   '(min-width: 1280px)': '50vw',\n   *   '(min-width: 640px)': '60vw',\n   *   fallback: '100vw',\n   * }\n   * ```\n   */\n  sizes?: Size;\n  /**\n   * Static width to use for img with optional pixel density support.\n   */\n  width?: string;\n  /**\n   * Use custom cname for generated filelinks.\n   */\n  cname?: string;\n\n  /**\n   * Image transformations options\n   *\n   * @see https://www.filestack.com/docs/image-transformations\n   */\n  transforms?: TransformOptions;\n}\n\nconst defaultResolutions = [\n  180,\n  360,\n  540,\n  720,\n  900,\n  1080,\n  1296,\n  1512,\n  1728,\n  1944,\n  2160,\n  2376,\n  2592,\n  2808,\n  3024,\n];\n\n/**\n * Based on the provided transform options object create filestack filelink\n */\nconst createFileLink = (handle: FileHandle, fileLinkOptions: FileLinkOptions) => {\n  let fileLink: Filelink;\n  // Use storage alias handle\n  if (isFileHandleByStorageAlias(handle)) {\n    fileLink = new Filelink(handle.srcHandle, handle.apiKey);\n  } else {\n    fileLink = new Filelink(handle);\n  }\n  // If validator is enabled use only for the first filelink in set\n  if (!fileLinkOptions.useValidator || (fileLinkOptions.indexInSet && fileLinkOptions.indexInSet > 0)) {\n    fileLink.setUseValidator(false);\n  }\n\n  Object.keys(fileLinkOptions.transform).sort(outputFirstSort).forEach((key: keyof TransformOptions) => {\n    fileLink = fileLink.addTask(key, fileLinkOptions.transform[key]);\n  });\n  if (fileLinkOptions.cname) {\n    fileLink.setCname(fileLinkOptions.cname);\n  }\n  return fileLink.toString();\n};\n\n/**\n * Sort array of keys in a way that 'output' is always the first\n * @param previousKey - First key to be compared in a sort function\n */\nconst outputFirstSort = (previousKey: string, nextKey: string) => {\n  return previousKey === 'output' ? -1 : nextKey === 'output' ? 1 : 0;\n};\n\nconst getWidth = (width?: number | string) => (resolution: number | string) => {\n  if (typeof resolution === 'number') {\n    return resolution;\n  }\n  const unit = utils.getUnit(resolution);\n\n  if (unit === 'w') {\n    return utils.getNumber(resolution);\n  }\n  // Pixel density (2x == 2 * size)\n  return utils.getNumber(width) * utils.getNumber(resolution);\n};\n\n/**\n * Construct Filestack URL out of CDN base and handle, with optional security\n */\nconst getCdnUrl = (handle: FileHandle, options: PictureOptions) => {\n  const fileLinkOptions = {\n    transform: Object.assign({}, options.transforms),\n    useValidator: options.useValidator,\n    cname: options.cname,\n  };\n\n  return createFileLink(handle, fileLinkOptions);\n};\n\n/**\n * Constructs a srcset attribute for source and img elements.\n * Will use resolution descriptors or pixel densities to construct\n * the proper URLs based on the width of the image.\n */\nconst makeSrcSet = (\n  handle: FileHandle,\n  options: any,\n  width?: number | string,\n  format?: string,\n) => {\n\n  let fileLinkOptions: FileLinkOptions = {\n    transform: Object.assign({}, options.transforms),\n    useValidator: options.useValidator,\n    cname: options.cname,\n  };\n\n  if (format) {\n    fileLinkOptions.transform.output = { format };\n  }\n\n  if (!width && format) {\n    return createFileLink(handle, fileLinkOptions);\n  }\n\n  const resolutions = options.resolutions.map((val: any) => typeof val === 'number' ? `${val}w` : val);\n\n  const widths = options.resolutions.map((val: any) => {\n    return getWidth(width)(val);\n  });\n\n  const urls: any[] = widths.map((width: number, index: number) => {\n    fileLinkOptions.indexInSet = index;\n    fileLinkOptions.transform.resize = { width };\n\n    return createFileLink(handle, fileLinkOptions);\n  }, widths);\n\n  return urls.map((url, index) => `${url} ${resolutions[index]}`).join(', ');\n};\n\n/**\n * Construct src attribute for img element.\n * This may contain a resized URL if a fallback size is provided.\n */\nconst makeSrc = (handle: FileHandle, fallback: string, options: PictureOptions) => {\n  const unit = utils.getUnit(fallback);\n  if (unit === 'vw') {\n    return getCdnUrl(handle, options);\n  }\n  const fileLinkOptions = {\n    transform: Object.assign({}, options.transforms),\n    useValidator: options.useValidator,\n    cname: options.cname,\n  };\n  fileLinkOptions.transform.resize = { width: utils.getNumber(fallback) };\n  return createFileLink(handle, fileLinkOptions);\n};\n\n/**\n * A source element contains many possible hints for the browser.\n * For each media query + size pair we can construct a source\n * with the proper srcset using the size as the width parameter.\n * For each format a source element can be constructed as well.\n * This means there are (sizes × formats) sources.\n *\n * R.xprod lets us compute the Cartesian product of two lists.\n */\nconst makeSourcesTree = (handle: FileHandle, options: any): Source[] => {\n  const makeSource = (media: any, width: any, format: any): Source | undefined => {\n    if (!format && media === 'fallback') {\n      return undefined;\n    }\n    return utils.removeEmpty({\n      media: media === 'fallback' ? undefined : media,\n      sizes: width,\n      srcSet: makeSrcSet(handle, options, width, format),\n      type: format ? `image/${format}` : undefined,\n      // key: options.keys\n      //   ? `${handle}-${media || 'fallback'}-${width || 'auto'}-${format || 'auto'}`\n      //   : undefined,\n    });\n  };\n  // Handle three cases -- sizes + type, just sizes, just type\n  if (!options.sizes && options.formats) {\n    const sources = options.formats.map((format: string) => makeSource(null, null, format)).filter((source: string) => !!source);\n    return sources;\n  }\n\n  let sources: any[] = Object.entries(options.sizes);\n\n  if (options.formats) {\n    sources = utils.arrToChunks(utils.flat(utils.cartesian([sources, options.formats]), 2), 3);\n  }\n\n  const sourcesTree = sources.map((source: any) => {\n    return makeSource.apply(null, source);\n  }).filter(source => !!source);\n  return sourcesTree;\n};\n\n/**\n * Just your basic HTML img element. However we can let the user specify\n * a specific width which will incorporate pixel resolutions options in a srcset.\n */\nconst makeImgTree = (handle: FileHandle, options: PictureOptions): Img => {\n  if (options.width) {\n    return utils.removeEmpty({\n      src: makeSrc(handle, options.width, options),\n      srcSet: makeSrcSet(handle, options, options.width),\n      alt: options.alt,\n      width: utils.getNumber(options.width),\n    });\n  }\n\n  const fallback = options.sizes && options.sizes.fallback;\n\n  return utils.removeEmpty({\n    src: fallback ? makeSrc(handle, fallback, options) : getCdnUrl(handle, options),\n    srcSet: options.sizes ? makeSrcSet(handle, options, fallback) : undefined,\n    alt: options.alt,\n    width: options.width,\n    sizes: fallback || undefined,\n  });\n};\n\n/**\n * Represent a picture element as a tree where leaf nodes are attributes\n * of one img element and zero or more source elements.\n *\n * This allows passing the structure into hyperscript-like virtual DOM generators.\n * For example see https://github.com/choojs/hyperx\n */\nexport const makePictureTree = (handle?: FileHandle, opts?: PictureOptions): Picture => {\n  if (typeof handle !== 'string' && !isFileHandleByStorageAlias(handle)) {\n    throw new TypeError('Filestack handle must be a string');\n  }\n\n  if (opts && opts.resolutions && opts.resolutions.length) {\n    const rUnits: string[] = opts.resolutions.filter((resolution: any) => {\n      return typeof resolution === 'string';\n    }).map((resolution: string) => {\n      return utils.getUnit(resolution);\n    });\n    if (!opts.sizes && (opts.resolutions.some((resolution) => typeof resolution === 'number') || rUnits.indexOf('w') > -1)) {\n      throw new Error('You must specify at least one size to use width descriptors');\n    }\n    if (!opts.width && rUnits.indexOf('x') > -1) {\n      throw new Error('You must specify a width to use pixel densities.');\n    }\n  }\n\n  opts = utils.removeEmpty(opts);\n\n  const options: PictureOptions = {\n    resolutions: opts && opts.width ? ['1x', '2x'] : defaultResolutions,\n    // keys: true,\n    ...opts,\n  };\n\n  options.transforms = options.transforms || {}; // ensure transforms are defined\n\n  if (options.security) {\n    options.transforms.security = options.security;\n  }\n\n  const img: Img = makeImgTree(handle, options);\n  const tree: Picture = { img };\n\n  if (options.sizes || options.formats) {\n    const sources: Source[] = makeSourcesTree(handle, options);\n    tree.sources = sources && sources.length ? sources : undefined;\n  }\n\n  return utils.removeEmpty(tree);\n};\n"]}