gatsby-transformer-sharp/src/customize-schema.js

const Promise = require(`bluebird`)
const {
  GraphQLObjectType,
  GraphQLList,
  GraphQLBoolean,
  GraphQLString,
  GraphQLInt,
  GraphQLFloat,
  GraphQLNonNull,
  GraphQLJSON,
} = require(`gatsby/graphql`)
const {
  queueImageResizing,
  base64,
  fluid,
  fixed,
  traceSVG,
  generateImageData,
} = require(`gatsby-plugin-sharp`)

const sharp = require(`./safe-sharp`)
const fs = require(`fs-extra`)
const imageSize = require(`probe-image-size`)
const path = require(`path`)

const DEFAULT_PNG_COMPRESSION_SPEED = 4

const {
  ImageFormatType,
  ImageCropFocusType,
  DuotoneGradientType,
  PotraceTurnPolicyType,
  PotraceType,
  ImageFitType,
  ImageLayoutType,
  ImagePlaceholderType,
  JPGOptionsType,
  PNGOptionsType,
  WebPOptionsType,
  BlurredOptionsType,
  TransformOptionsType,
} = require(`./types`)
const { stripIndent } = require(`common-tags`)
const { prefixId, CODES } = require(`./error-utils`)

function toArray(buf) {
  const arr = new Array(buf.length)

  for (let i = 0; i < buf.length; i++) {
    arr[i] = buf[i]
  }

  return arr
}

const getTracedSVG = async ({ file, image, fieldArgs, cache, reporter }) =>
  traceSVG({
    file,
    args: { ...fieldArgs.traceSVG },
    fileArgs: fieldArgs,
    cache,
    reporter,
  })

const fixedNodeType = ({
  pathPrefix,
  getNodeAndSavePathDependency,
  reporter,
  name,
  cache,
}) => {
  return {
    type: new GraphQLObjectType({
      name: name,
      fields: {
        base64: { type: GraphQLString },
        tracedSVG: {
          type: GraphQLString,
          resolve: parent =>
            getTracedSVG({
              ...parent,
              cache,
              reporter,
            }),
        },
        aspectRatio: { type: GraphQLFloat },
        width: { type: new GraphQLNonNull(GraphQLFloat) },
        height: { type: new GraphQLNonNull(GraphQLFloat) },
        src: { type: new GraphQLNonNull(GraphQLString) },
        srcSet: { type: new GraphQLNonNull(GraphQLString) },
        srcWebp: {
          type: GraphQLString,
          resolve: ({ file, image, fieldArgs }) => {
            // If the file is already in webp format or should explicitly
            // be converted to webp, we do not create additional webp files
            if (file.extension === `webp` || fieldArgs.toFormat === `webp`) {
              return null
            }
            const args = { ...fieldArgs, pathPrefix, toFormat: `webp` }
            return Promise.resolve(
              fixed({
                file,
                args,
                reporter,
                cache,
              })
            ).then(({ src }) => src)
          },
        },
        srcSetWebp: {
          type: GraphQLString,
          resolve: ({ file, image, fieldArgs }) => {
            if (file.extension === `webp` || fieldArgs.toFormat === `webp`) {
              return null
            }
            const args = { ...fieldArgs, pathPrefix, toFormat: `webp` }
            return Promise.resolve(
              fixed({
                file,
                args,
                reporter,
                cache,
              })
            ).then(({ srcSet }) => srcSet)
          },
        },
        originalName: { type: GraphQLString },
      },
    }),
    args: {
      width: {
        type: GraphQLInt,
      },
      height: {
        type: GraphQLInt,
      },
      base64Width: {
        type: GraphQLInt,
      },
      jpegProgressive: {
        type: GraphQLBoolean,
        defaultValue: true,
      },
      pngCompressionSpeed: {
        type: GraphQLInt,
        defaultValue: DEFAULT_PNG_COMPRESSION_SPEED,
      },
      grayscale: {
        type: GraphQLBoolean,
        defaultValue: false,
      },
      duotone: {
        type: DuotoneGradientType,
        defaultValue: false,
      },
      traceSVG: {
        type: PotraceType,
        defaultValue: false,
      },
      quality: {
        type: GraphQLInt,
      },
      jpegQuality: {
        type: GraphQLInt,
      },
      pngQuality: {
        type: GraphQLInt,
      },
      webpQuality: {
        type: GraphQLInt,
      },
      toFormat: {
        type: ImageFormatType,
        defaultValue: ``,
      },
      toFormatBase64: {
        type: ImageFormatType,
        defaultValue: ``,
      },
      cropFocus: {
        type: ImageCropFocusType,
        defaultValue: sharp.strategy.attention,
      },
      fit: {
        type: ImageFitType,
        defaultValue: sharp.fit.cover,
      },
      background: {
        type: GraphQLString,
        defaultValue: `rgba(0,0,0,1)`,
      },
      rotate: {
        type: GraphQLInt,
        defaultValue: 0,
      },
      trim: {
        type: GraphQLFloat,
        defaultValue: false,
      },
    },
    resolve: (image, fieldArgs, context) => {
      const file = getNodeAndSavePathDependency(image.parent, context.path)
      const args = { ...fieldArgs, pathPrefix }
      return Promise.resolve(
        fixed({
          file,
          args,
          reporter,
          cache,
        })
      ).then(o =>
        Object.assign({}, o, {
          fieldArgs: args,
          image,
          file,
        })
      )
    },
  }
}

const fluidNodeType = ({
  pathPrefix,
  getNodeAndSavePathDependency,
  reporter,
  name,
  cache,
}) => {
  return {
    type: new GraphQLObjectType({
      name: name,
      fields: {
        base64: { type: GraphQLString },
        tracedSVG: {
          type: GraphQLString,
          resolve: parent =>
            getTracedSVG({
              ...parent,
              cache,
              reporter,
            }),
        },
        aspectRatio: { type: new GraphQLNonNull(GraphQLFloat) },
        src: { type: new GraphQLNonNull(GraphQLString) },
        srcSet: { type: new GraphQLNonNull(GraphQLString) },
        srcWebp: {
          type: GraphQLString,
          resolve: ({ file, image, fieldArgs }) => {
            if (image.extension === `webp` || fieldArgs.toFormat === `webp`) {
              return null
            }
            const args = { ...fieldArgs, pathPrefix, toFormat: `webp` }
            return Promise.resolve(
              fluid({
                file,
                args,
                reporter,
                cache,
              })
            ).then(({ src }) => src)
          },
        },
        srcSetWebp: {
          type: GraphQLString,
          resolve: ({ file, image, fieldArgs }) => {
            if (image.extension === `webp` || fieldArgs.toFormat === `webp`) {
              return null
            }
            const args = { ...fieldArgs, pathPrefix, toFormat: `webp` }
            return Promise.resolve(
              fluid({
                file,
                args,
                reporter,
                cache,
              })
            ).then(({ srcSet }) => srcSet)
          },
        },
        sizes: { type: new GraphQLNonNull(GraphQLString) },
        originalImg: { type: GraphQLString },
        originalName: { type: GraphQLString },
        presentationWidth: { type: new GraphQLNonNull(GraphQLInt) },
        presentationHeight: { type: new GraphQLNonNull(GraphQLInt) },
      },
    }),
    args: {
      maxWidth: {
        type: GraphQLInt,
      },
      maxHeight: {
        type: GraphQLInt,
      },
      base64Width: {
        type: GraphQLInt,
      },
      grayscale: {
        type: GraphQLBoolean,
        defaultValue: false,
      },
      jpegProgressive: {
        type: GraphQLBoolean,
        defaultValue: true,
      },
      pngCompressionSpeed: {
        type: GraphQLInt,
        defaultValue: DEFAULT_PNG_COMPRESSION_SPEED,
      },
      duotone: {
        type: DuotoneGradientType,
        defaultValue: false,
      },
      traceSVG: {
        type: PotraceType,
        defaultValue: false,
      },
      quality: {
        type: GraphQLInt,
      },
      jpegQuality: {
        type: GraphQLInt,
      },
      pngQuality: {
        type: GraphQLInt,
      },
      webpQuality: {
        type: GraphQLInt,
      },
      toFormat: {
        type: ImageFormatType,
        defaultValue: ``,
      },
      toFormatBase64: {
        type: ImageFormatType,
        defaultValue: ``,
      },
      cropFocus: {
        type: ImageCropFocusType,
        defaultValue: sharp.strategy.attention,
      },
      fit: {
        type: ImageFitType,
        defaultValue: sharp.fit.cover,
      },
      background: {
        type: GraphQLString,
        defaultValue: `rgba(0,0,0,1)`,
      },
      rotate: {
        type: GraphQLInt,
        defaultValue: 0,
      },
      trim: {
        type: GraphQLFloat,
        defaultValue: false,
      },
      sizes: {
        type: GraphQLString,
        defaultValue: ``,
      },
      srcSetBreakpoints: {
        type: GraphQLList(GraphQLInt),
        defaultValue: [],
        description: `A list of image widths to be generated. Example: [ 200, 340, 520, 890 ]`,
      },
    },
    resolve: (image, fieldArgs, context) => {
      const file = getNodeAndSavePathDependency(image.parent, context.path)
      const args = { ...fieldArgs, pathPrefix }
      return Promise.resolve(
        fluid({
          file,
          args,
          reporter,
          cache,
        })
      ).then(o =>
        Object.assign({}, o, {
          fieldArgs: args,
          image,
          file,
        })
      )
    },
  }
}

let warnedForAlpha = false

const imageNodeType = ({
  pathPrefix,
  getNodeAndSavePathDependency,
  reporter,
  cache,
}) => {
  return {
    type: new GraphQLNonNull(GraphQLJSON),
    args: {
      layout: {
        type: ImageLayoutType,
        defaultValue: `fixed`,
        description: stripIndent`
        The layout for the image.
        FIXED: A static image sized, that does not resize according to the screen width
        FLUID: The image resizes to fit its container. Pass a "sizes" option if it isn't going to be the full width of the screen. 
        CONSTRAINED: Resizes to fit its container, up to a maximum width, at which point it will remain fixed in size.
        `,
      },
      maxWidth: {
        type: GraphQLInt,
        description: stripIndent`
        Maximum display width of generated files. 
        The actual largest image resolution will be this value multipled by the largest value in outputPixelDensities
        This only applies when layout = FLUID or CONSTRAINED. For other layout types, use "width"`,
      },
      maxHeight: {
        type: GraphQLInt,
        description: stripIndent`
        If set, the generated image is a maximum of this height, cropping if necessary. 
        If the image layout is "constrained" then the image will be limited to this height. 
        If the aspect ratio of the image is different than the source, then the image will be cropped.`,
      },
      width: {
        type: GraphQLInt,
        description: stripIndent`
        The display width of the generated image. 
        The actual largest image resolution will be this value multipled by the largest value in outputPixelDensities
        Ignored if layout = FLUID or CONSTRAINED, where you should use "maxWidth" instead.
        `,
      },
      height: {
        type: GraphQLInt,
        description: stripIndent`
        If set, the height of the generated image. If omitted, it is calculated from the supplied width, matching the aspect ratio of the source image.`,
      },
      placeholder: {
        type: ImagePlaceholderType,
        defaultValue: `blurred`,
        description: stripIndent`
        Format of generated placeholder image, displayed while the main image loads. 
        BLURRED: a blurred, low resolution image, encoded as a base64 data URI (default)
        DOMINANT_COLOR: a solid color, calculated from the dominant color of the image. 
        TRACED_SVG: a low-resolution traced SVG of the image.
        NONE: no placeholder. Set "background" to use a fixed background color.`,
      },
      blurredOptions: {
        type: BlurredOptionsType,
        description: `Options for the low-resolution placeholder image. Set placeholder to "BLURRED" to use this`,
      },
      tracedSVGOptions: {
        type: PotraceType,
        defaultValue: false,
        description: `Options for traced placeholder SVGs. You also should set placeholder to "SVG".`,
      },
      formats: {
        type: GraphQLList(ImageFormatType),
        description: stripIndent`
        The image formats to generate. Valid values are "AUTO" (meaning the same format as the source image), "JPG", "PNG" and "WEBP". 
        The default value is [AUTO, WEBP], and you should rarely need to change this. Take care if you specify JPG or PNG when you do
        not know the formats of the source images, as this could lead to unwanted results such as converting JPEGs to PNGs. Specifying 
        both PNG and JPG is not supported and will be ignored.
        `,
        defaultValue: [`auto`, `webp`],
      },
      outputPixelDensities: {
        type: GraphQLList(GraphQLFloat),
        description: stripIndent`
        A list of image pixel densities to generate. It will never generate images larger than the source, and will always include a 1x image. 
        Default is [ 1, 2 ] for fixed images, meaning 1x, 2x, 3x, and [0.25, 0.5, 1, 2] for fluid. In this case, an image with a fluid layout and width = 400 would generate images at 100, 200, 400 and 800px wide`,
      },
      sizes: {
        type: GraphQLString,
        defaultValue: ``,
        description: stripIndent`
        The "sizes" property, passed to the img tag. This describes the display size of the image. 
        This does not affect the generated images, but is used by the browser to decide which images to download. You can leave this blank for fixed images, or if the responsive image
        container will be the full width of the screen. In these cases we will generate an appropriate value.
        `,
      },
      quality: {
        type: GraphQLInt,
        description: `The default quality. This is overriden by any format-specific options`,
      },
      jpgOptions: {
        type: JPGOptionsType,
        description: `Options to pass to sharp when generating JPG images.`,
      },
      pngOptions: {
        type: PNGOptionsType,
        description: `Options to pass to sharp when generating PNG images.`,
      },
      webpOptions: {
        type: WebPOptionsType,
        description: `Options to pass to sharp when generating WebP images.`,
      },
      transformOptions: {
        type: TransformOptionsType,
        description: `Options to pass to sharp to control cropping and other image manipulations.`,
      },
      background: {
        type: GraphQLString,
        defaultValue: `rgba(0,0,0,0)`,
        description: `Background color applied to the wrapper. Also passed to sharp to use as a background when "letterboxing" an image to another aspect ratio.`,
      },
    },
    resolve: async (image, fieldArgs, context) => {
      const file = getNodeAndSavePathDependency(image.parent, context.path)
      const args = { ...fieldArgs, pathPrefix }

      if (!generateImageData) {
        reporter.warn(`Please upgrade gatsby-plugin-sharp`)
        return null
      }
      if (!warnedForAlpha) {
        reporter.warn(
          stripIndent`
        You are using the alpha version of the \`gatsbyImageData\` sharp API, which is unstable and will change without notice. 
        Please do not use it in production.`
        )
        warnedForAlpha = true
      }
      const imageData = await generateImageData({
        file,
        args,
        reporter,
        cache,
      })

      return imageData
    },
  }
}

/**
 * Keeps track of asynchronous file copy to prevent sequence errors in the
 * underlying fs-extra module during parallel copies of the same file
 */
const inProgressCopy = new Set()

const createFields = ({
  pathPrefix,
  getNodeAndSavePathDependency,
  reporter,
  cache,
}) => {
  const nodeOptions = {
    pathPrefix,
    getNodeAndSavePathDependency,
    reporter,
    cache,
  }

  // TODO: Remove resolutionsNode and sizesNode for Gatsby v3
  const fixedNode = fixedNodeType({ name: `ImageSharpFixed`, ...nodeOptions })
  const resolutionsNode = fixedNodeType({
    name: `ImageSharpResolutions`,
    ...nodeOptions,
  })
  resolutionsNode.deprecationReason = `Resolutions was deprecated in Gatsby v2. It's been renamed to "fixed" https://example.com/write-docs-and-fix-this-example-link`

  const fluidNode = fluidNodeType({ name: `ImageSharpFluid`, ...nodeOptions })
  const sizesNode = fluidNodeType({ name: `ImageSharpSizes`, ...nodeOptions })
  sizesNode.deprecationReason = `Sizes was deprecated in Gatsby v2. It's been renamed to "fluid" https://example.com/write-docs-and-fix-this-example-link`

  const imageNode = imageNodeType(nodeOptions)

  return {
    fixed: fixedNode,
    resolutions: resolutionsNode,
    fluid: fluidNode,
    sizes: sizesNode,
    gatsbyImageData: imageNode,
    original: {
      type: new GraphQLObjectType({
        name: `ImageSharpOriginal`,
        fields: {
          width: { type: GraphQLFloat },
          height: { type: GraphQLFloat },
          src: { type: GraphQLString },
        },
      }),
      args: {},
      async resolve(image, fieldArgs, context) {
        const details = getNodeAndSavePathDependency(image.parent, context.path)
        const dimensions = imageSize.sync(
          toArray(fs.readFileSync(details.absolutePath))
        )
        const imageName = `${details.name}-${image.internal.contentDigest}${details.ext}`
        const publicPath = path.join(
          process.cwd(),
          `public`,
          `static`,
          imageName
        )

        if (!fs.existsSync(publicPath) && !inProgressCopy.has(publicPath)) {
          // keep track of in progress copy, we should rely on `existsSync` but
          // a race condition exists between the exists check and the copy
          inProgressCopy.add(publicPath)
          fs.copy(details.absolutePath, publicPath, err => {
            // this is no longer in progress
            inProgressCopy.delete(publicPath)
            if (err) {
              reporter.panic(
                {
                  id: prefixId(CODES.MissingResource),
                  context: {
                    sourceMessage: `error copying file from ${details.absolutePath} to ${publicPath}`,
                  },
                },
                err
              )
            }
          })
        }

        return {
          width: dimensions.width,
          height: dimensions.height,
          src: `${pathPrefix}/static/${imageName}`,
        }
      },
    },
    resize: {
      type: new GraphQLObjectType({
        name: `ImageSharpResize`,
        fields: {
          src: { type: GraphQLString },
          tracedSVG: {
            type: GraphQLString,
            resolve: parent =>
              getTracedSVG({
                ...parent,
                cache,
                reporter,
              }),
          },
          width: { type: GraphQLInt },
          height: { type: GraphQLInt },
          aspectRatio: { type: GraphQLFloat },
          originalName: { type: GraphQLString },
        },
      }),
      args: {
        width: {
          type: GraphQLInt,
        },
        height: {
          type: GraphQLInt,
        },
        quality: {
          type: GraphQLInt,
        },
        jpegQuality: {
          type: GraphQLInt,
        },
        pngQuality: {
          type: GraphQLInt,
        },
        webpQuality: {
          type: GraphQLInt,
        },
        jpegProgressive: {
          type: GraphQLBoolean,
          defaultValue: true,
        },
        pngCompressionLevel: {
          type: GraphQLInt,
          defaultValue: 9,
        },
        pngCompressionSpeed: {
          type: GraphQLInt,
          defaultValue: DEFAULT_PNG_COMPRESSION_SPEED,
        },
        grayscale: {
          type: GraphQLBoolean,
          defaultValue: false,
        },
        duotone: {
          type: DuotoneGradientType,
          defaultValue: false,
        },
        base64: {
          type: GraphQLBoolean,
          defaultValue: false,
        },
        traceSVG: {
          type: PotraceType,
          defaultValue: false,
        },
        toFormat: {
          type: ImageFormatType,
          defaultValue: ``,
        },
        cropFocus: {
          type: ImageCropFocusType,
          defaultValue: sharp.strategy.attention,
        },
        fit: {
          type: ImageFitType,
          defaultValue: sharp.fit.cover,
        },
        background: {
          type: GraphQLString,
          defaultValue: `rgba(0,0,0,1)`,
        },
        rotate: {
          type: GraphQLInt,
          defaultValue: 0,
        },
        trim: {
          type: GraphQLFloat,
          defaultValue: 0,
        },
      },
      resolve: (image, fieldArgs, context) => {
        const file = getNodeAndSavePathDependency(image.parent, context.path)
        const args = { ...fieldArgs, pathPrefix }
        return new Promise(resolve => {
          if (fieldArgs.base64) {
            resolve(
              base64({
                file,
                cache,
              })
            )
          } else {
            const o = queueImageResizing({
              file,
              args,
            })
            resolve(
              Object.assign({}, o, {
                image,
                file,
                fieldArgs: args,
              })
            )
          }
        })
      },
    },
  }
}

module.exports = ({
  actions,
  schema,
  pathPrefix,
  getNodeAndSavePathDependency,
  reporter,
  cache,
}) => {
  const { createTypes } = actions

  const imageSharpType = schema.buildObjectType({
    name: `ImageSharp`,
    fields: createFields({
      pathPrefix,
      getNodeAndSavePathDependency,
      reporter,
      cache,
    }),
    interfaces: [`Node`],
    extensions: {
      infer: true,
      childOf: {
        types: [`File`],
      },
    },
  })

  if (createTypes) {
    createTypes([
      ImageFormatType,
      ImageFitType,
      ImageLayoutType,
      ImageCropFocusType,
      DuotoneGradientType,
      PotraceTurnPolicyType,
      PotraceType,
      imageSharpType,
    ])
  }
}