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index.js
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index.js
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const visit = require(`unist-util-visit`)
const isRelativeUrl = require(`is-relative-url`)
const fsExtra = require(`fs-extra`)
const path = require(`path`)
const _ = require(`lodash`)
const cheerio = require(`cheerio`)
const sizeOf = require(`image-size`)
const DEPLOY_DIR = `public`
const invalidDestinationDirMessage = dir =>
`[gatsby-remark-copy-linked-files You have supplied an invalid destination directory. The destination directory must be a child but was: ${dir}`
// dir must be a child
const destinationDirIsValid = dir => !path.relative(`./`, dir).startsWith(`..`)
const validateDestinationDir = dir =>
!dir || (dir && destinationDirIsValid(dir))
const newFileName = linkNode =>
`${linkNode.name}-${linkNode.internal.contentDigest}.${linkNode.extension}`
const newPath = (linkNode, destinationDir) => {
if (destinationDir) {
return path.posix.join(
process.cwd(),
DEPLOY_DIR,
destinationDir,
newFileName(linkNode)
)
}
return path.posix.join(process.cwd(), DEPLOY_DIR, newFileName(linkNode))
}
const newLinkURL = (linkNode, destinationDir, pathPrefix) => {
const linkPaths = [`/`, pathPrefix, destinationDir, newFileName(linkNode)]
.filter(function(lpath) {
if (lpath) return true
return false
})
return path.posix.join(...linkPaths)
}
module.exports = (
{ files, markdownNode, markdownAST, pathPrefix, getNode },
pluginOptions = {}
) => {
const defaults = {
ignoreFileExtensions: [`png`, `jpg`, `jpeg`, `bmp`, `tiff`],
pathPrefix,
}
const { destinationDir } = pluginOptions
if (!validateDestinationDir(destinationDir))
return Promise.reject(invalidDestinationDirMessage(destinationDir))
const options = _.defaults(pluginOptions, defaults)
const filesToCopy = new Map()
// Copy linked files to the destination directory and modify the AST to point
// to new location of the files.
const visitor = link => {
if (
isRelativeUrl(link.url) &&
getNode(markdownNode.parent).internal.type === `File`
) {
const linkPath = path.posix.join(
getNode(markdownNode.parent).dir,
link.url
)
const linkNode = _.find(files, file => {
if (file && file.absolutePath) {
return file.absolutePath === linkPath
}
return null
})
if (linkNode && linkNode.absolutePath) {
const newFilePath = newPath(linkNode, options.destinationDir)
// Prevent uneeded copying
if (linkPath === newFilePath) return
const linkURL = newLinkURL(linkNode, options.destinationDir, options.pathPrefix)
link.url = linkURL
filesToCopy.set(linkPath, newFilePath)
}
}
}
// Takes a node and generates the needed images and then returns
// the needed HTML replacement for the image
const generateImagesAndUpdateNode = function(image, node) {
const imagePath = path.posix.join(
getNode(markdownNode.parent).dir,
image.attr(`src`)
)
const imageNode = _.find(files, file => {
if (file && file.absolutePath) {
return file.absolutePath === imagePath
}
return null
})
if (!imageNode || !imageNode.absolutePath) {
return
}
const initialImageSrc = image.attr(`src`)
// The link object will be modified to the new location so we'll
// use that data to update our ref
const link = { url: image.attr(`src`) }
visitor(link)
node.value = node.value.replace(
new RegExp(image.attr(`src`), `g`),
link.url
)
let dimensions
if (!image.attr(`width`) || !image.attr(`height`)) {
dimensions = sizeOf(imageNode.absolutePath)
}
// Generate default alt tag
const srcSplit = initialImageSrc.split(`/`)
const fileName = srcSplit[srcSplit.length - 1]
const fileNameNoExt = fileName.replace(/\.[^/.]+$/, ``)
const defaultAlt = fileNameNoExt.replace(/[^A-Z0-9]/gi, ` `)
image.attr(`alt`, image.attr(`alt`) ? image.attr(`alt`) : defaultAlt)
image.attr(
`width`,
image.attr(`width`) ? image.attr(`width`) : dimensions.width
)
image.attr(
`height`,
image.attr(`height`) ? image.attr(`height`) : dimensions.height
)
}
visit(markdownAST, `link`, link => {
const ext = link.url.split(`.`).pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
visitor(link)
})
// This will only work for markdown img tags
visit(markdownAST, `image`, image => {
const ext = image.url.split(`.`).pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
const imagePath = path.posix.join(
getNode(markdownNode.parent).dir,
image.url
)
const imageNode = _.find(files, file => {
if (file && file.absolutePath) {
return file.absolutePath === imagePath
}
return false
})
if (imageNode) {
visitor(image)
}
})
// For each HTML Node
visit(markdownAST, `html`, node => {
const $ = cheerio.load(node.value)
// Handle Images
const imageRefs = []
$(`img`).each(function() {
try {
if (isRelativeUrl($(this).attr(`src`))) {
imageRefs.push($(this))
}
} catch (err) {
// Ignore
}
})
for (let thisImg of imageRefs) {
try {
const ext = thisImg
.attr(`src`)
.split(`.`)
.pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
generateImagesAndUpdateNode(thisImg, node)
} catch (err) {
// Ignore
}
}
// Handle video tags.
const videoRefs = []
$(`video source`).each(function() {
try {
if (isRelativeUrl($(this).attr(`src`))) {
videoRefs.push($(this))
}
} catch (err) {
// Ignore
}
})
for (let thisVideo of videoRefs) {
try {
const ext = thisVideo
.attr(`src`)
.split(`.`)
.pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
// The link object will be modified to the new location so we'll
// use that data to update our ref
const link = { url: thisVideo.attr(`src`) }
visitor(link)
node.value = node.value.replace(
new RegExp(thisVideo.attr(`src`), `g`),
link.url
)
} catch (err) {
// Ignore
}
}
// Handle audio tags.
const audioRefs = []
$(`audio source`).each(function() {
try {
if (isRelativeUrl($(this).attr(`src`))) {
audioRefs.push($(this))
}
} catch (err) {
// Ignore
}
})
for (let thisAudio of audioRefs) {
try {
const ext = thisAudio
.attr(`src`)
.split(`.`)
.pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
const link = { url: thisAudio.attr(`src`) }
visitor(link)
node.value = node.value.replace(
new RegExp(thisAudio.attr(`src`), `g`),
link.url
)
} catch (err) {
// Ignore
}
}
// Handle a tags.
const aRefs = []
$(`a`).each(function() {
try {
if (isRelativeUrl($(this).attr(`href`))) {
aRefs.push($(this))
}
} catch (err) {
// Ignore
}
})
for (let thisATag of aRefs) {
try {
const ext = thisATag
.attr(`href`)
.split(`.`)
.pop()
if (options.ignoreFileExtensions.includes(ext)) {
return
}
const link = { url: thisATag.attr(`href`) }
visitor(link)
node.value = node.value.replace(
new RegExp(thisATag.attr(`href`), `g`),
link.url
)
} catch (err) {
// Ignore
}
}
return
})
return Promise.all(
Array.from(filesToCopy, async ([linkPath, newFilePath]) => {
// Don't copy anything is the file already exists at the location.
if (!fsExtra.existsSync(newFilePath)) {
try {
await fsExtra.ensureDir(path.dirname(newFilePath))
await fsExtra.copy(linkPath, newFilePath)
} catch (err) {
console.error(`error copy ing file`, err)
}
}
})
)
}