hashfs
Implementation of io/fs.FS that appends SHA256 hashes to filenames to allow for aggressive HTTP caching.
For example, given a file path of /scripts/main.js, the hashfs.FS filesystem will provide the server with a hashname of /scripts/main-b633a..d628.js. Note the hash is truncated for brevity. When this file path is requested by the client, the server can verify the hash and return the contents with an aggressive Cache-Control header. The client will cache this file for up to a year and does not need to re-reqeust it in the future.
Note that this library requires Go 1.16 or higher.
Usage
To use hashfs, first wrap your embed.FS in a hashfs.FS filesystem:
//go:embed scripts stylesheets images
var embedFS embed.FS
var fsys = hashfs.NewFS(embedFS)
Then attach a hashfs.FileServer() to your router:
http.Handle("/assets", http.StripPrefix("/assets", hashfs.FileServer(fsys)))
Next, your html templating library can obtain the hashname of your file using the hashfs.FS.HashName() method:
func renderHTML(w io.Writer) {
fmt.Fprintf(w, ``)
fmt.Fprintf(w, `
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Comments
-
![Use http.ServeContent + add ETag header]()
Use http.ServeContent + add ETag header
- Use http.ServeContent instead of io.Copy
http.ServeContent replies to the request using the content in the provided ReadSeeker. The main benefit of http.ServeContent over io.Copy is that it handles Range requests properly, sets the MIME type, and handles If-Match, If-Unmodified-Since, If-None-Match, If-Modified-Since, and If-Range requests.
https://pkg.go.dev/net/http#ServeContent
- Add ETag header
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
opened by SlIdE42 2
Releases(v0.2.1)
-
v0.2.1(Dec 21, 2021)
What's Changed
- Fix missing hash bug + prevent useless RegEx call by @SlIdE42 in https://github.com/benbjohnson/hashfs/pull/3
Full Changelog: https://github.com/benbjohnson/hashfs/compare/v0.2.0...v0.2.1
Source code(tar.gz)
Source code(zip)
-
v0.2.0(Dec 9, 2021)
What's Changed
- Fix typo by @jeffwidman in https://github.com/benbjohnson/hashfs/pull/1
- Use http.ServeContent + add ETag header by @SlIdE42 in https://github.com/benbjohnson/hashfs/pull/2
New Contributors
- @jeffwidman made their first contribution in https://github.com/benbjohnson/hashfs/pull/1
- @SlIdE42 made their first contribution in https://github.com/benbjohnson/hashfs/pull/2
Full Changelog: https://github.com/benbjohnson/hashfs/compare/v0.1.0...v0.2.0
Source code(tar.gz)
Source code(zip)
-
v0.1.0(Dec 11, 2020)
This release includes basic hashing & file serving functionality.
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