components

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1. // lib/uploads.hl — WHERE THE SHOWCASE KEEPS UPLOADED FILES (the site's decision, not the components'): the file upload demo
2. // keeps each file in storage/uploads under a random name (nothing is served back); the Markdown editor demo keeps its files in
3. // storage/md-files (served at /md-editor/files/…, see project.hl), only with a known kind of extension (nothing a browser would
4. // run). Both keep a file for one day: every upload first stores, then removes what is older.
5. import { writeFile, mkDir, listDir, remove } from 'hl:fs'
6. import { randomBytes } from 'hl:crypto'
7. import { now } from 'hl:time'
9. static kinds = ['png', 'jpg', 'jpeg', 'gif', 'webp', 'pdf', 'txt', 'md', 'zip']
11. // the file upload demo: one file in, its name and size back
12. static storeUpload = (file) => {
13. mkDir('storage/uploads')
14. writeFile('storage/uploads/' + now() + '-' + randomBytes(6) + '.bin', file.bytes)
15. dropOld('storage/uploads')
16. return { name = file.name size = file.size }
17. }
19. // the Markdown editor demo: files in, the address of each back, in order
20. static storeMdFiles = (files) => {
21. mkDir('storage/md-files')
22. let urls = []
23. for (f of files) {
24. let stored = now() + '-' + randomBytes(6) + '.' + extensionOf(f.name)
25. writeFile('storage/md-files/' + stored, f.bytes)
26. urls.push('/md-editor/files/' + stored)
27. }
28. dropOld('storage/md-files')
29. return urls
30. }
32. // the stored extension: the file's own when it is a known kind, else 'bin'
33. static extensionOf = (name) => {
34. let dot = name.lastIndexOf('.')
35. let ext = dot >= 0 ? name.slice(dot + 1).toLowerCase() : ''
36. let known = false
37. for (k of kinds) { if (k == ext) { known = true } }
38. return known ? ext : 'bin'
39. }
41. // removes the files of a folder stored more than a day ago (the name starts with the time it was stored)
42. static dropOld = (dir) => {
43. for (e of listDir(dir)) {
44. let stamp = toNumber(e.name.slice(0, e.name.indexOf('-')))
45. if (stamp != null && stamp < now() - 86400000) { remove(e.path) }
46. }
47. }