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package nvdmirror
// Sync to destination directory based on given sync configuration and
// cache. Returns an array of file names which have been updated in the
// destination directory.
//
// This function does the following:
//
// 1. Fetch the contents of the source meta URLs for CVE feeds and
// CPE matches. All source URLs are fetched concurrently.
//
// 2. Check the size and hash from meta files against the existing
// CVE feed and CPE match files in the destination directory. All
// file sizes and hashes are checked concurrently.
//
// 3. Fetch the contents of the changed CVE feeds, CPE match files, and
// the CPE dictionary.
//
// All HTTP requests are made with the following request headers:
//
// * if-modified-since (if the URL was queried previously and the
// previous successful response had a "last-modified" header).
// * if-none-match (if the URL was queried previously and the
// previous successful response had an "etag" header).
// * user-agent
//
func Sync(config SyncConfig, cache Cache, dstDir string) []string {
// build sync context
ctx := newSyncContext(config, cache, dstDir)
// fetch updated meta files
checks := ctx.fetchMetas()
// get syncable URLs
urls := append(ctx.checkMetas(checks), config.GetCpeDictUrl())
// sync urls and return changed files
return ctx.syncUrls(urls)
}
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