63 lines
2.7 KiB
JavaScript
63 lines
2.7 KiB
JavaScript
const path = require('path')
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const patterns = require('../patterns')
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const supportedVersions = new Set(Object.keys(require('../all-versions')))
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const getOldPathsFromPermalink = require('./get-old-paths-from-permalink')
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const { getVersionStringFromPath } = require('../path-utils')
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const { getNewVersionedPath } = require('../old-versions-utils')
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const removeFPTFromPath = require('../remove-fpt-from-path')
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module.exports = function generateRedirectsForPermalinks (permalinks, redirectFrontmatter) {
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// account for Array or String frontmatter entries
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const redirectFrontmatterOldPaths = redirectFrontmatter
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? Array.from([redirectFrontmatter]).flat()
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: []
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const redirects = {}
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// for every permalink...
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permalinks.forEach(permalink => {
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// get an array of possible old paths, e.g., /desktop/guides/ from current permalink /desktop/
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const possibleOldPaths = getOldPathsFromPermalink(permalink.href, permalink.languageCode, permalink.pageVersion)
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// for each old path, add a redirect to the current permalink
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possibleOldPaths.forEach(oldPath => {
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redirects[oldPath] = permalink.href
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})
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// for every redirect frontmatter old path...
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redirectFrontmatterOldPaths.forEach(frontmatterOldPath => {
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// remove trailing slashes (sometimes present in frontmatter)
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frontmatterOldPath = frontmatterOldPath.replace(patterns.trailingSlash, '$1')
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// support hardcoded versions in redirect frontmatter
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if (supportedVersions.has(frontmatterOldPath.split('/')[1])) {
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redirects[frontmatterOldPath] = permalink.href
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redirects[`/en${frontmatterOldPath}`] = permalink.href
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}
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// get the old path for the current permalink version
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let versionedFrontmatterOldPath = path.posix.join('/', permalink.languageCode, getNewVersionedPath(frontmatterOldPath))
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const versionFromPath = getVersionStringFromPath(versionedFrontmatterOldPath)
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versionedFrontmatterOldPath = removeFPTFromPath(versionedFrontmatterOldPath.replace(versionFromPath, permalink.pageVersion))
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// add it to the redirects object
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redirects[versionedFrontmatterOldPath] = permalink.href
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// then get an array of possible alternative old paths from the current versioned old path
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const possibleOldPathsForVersionedOldPaths = getOldPathsFromPermalink(versionedFrontmatterOldPath, permalink.languageCode, permalink.pageVersion)
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// and add each one to the redirects object
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possibleOldPathsForVersionedOldPaths.forEach(oldPath => {
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redirects[oldPath] = permalink.href
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})
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})
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})
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// filter for unique entries only
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Object.entries(redirects).forEach(([oldPath, newPath]) => {
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if (oldPath === newPath) delete redirects[oldPath]
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})
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return redirects
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}
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