URL shortener and file dump for hashru.link https://hashru.link
Nie możesz wybrać więcej, niż 25 tematów Tematy muszą się zaczynać od litery lub cyfry, mogą zawierać myślniki ('-') i mogą mieć do 35 znaków.
Daan Sprenkels fbab9028f4 Bump all dependencies 2 miesięcy temu
assets Use sql database instead of bolt 1 rok temu
cmd/rushlink Remove boltdb leftovers 7 miesięcy temu
contrib Don't capture cursor in screenshot. 2 lat temu
internal/db Remove boltdb leftovers 7 miesięcy temu
pkg/gobmarsh Refactor database login into a separate module 2 lat temu
.gitignore Add generated bindata.go file to repo 2 lat temu
LICENSE Initial commit 2 lat temu
README.md README: indicate change to ENV for configuration, refresh systemd unit file, introduce Gorm and db migration tool 7 miesięcy temu
bindata.go Update bindata.go 7 miesięcy temu
fileupload.go Fix gopls issues 7 miesięcy temu
go.mod Bump all dependencies 2 miesięcy temu
go.sum Bump all dependencies 2 miesięcy temu
handlers.go Fix gopls issues 7 miesięcy temu
handlers_test.go Use sql database instead of bolt 1 rok temu
metrics.go Optimize query for updating metricURLsTotalGauge 7 miesięcy temu
router.go Add request_duration_seconds metric 7 miesięcy temu
views.go Fix gopls issues 7 miesięcy temu
views_test.go Add a test for issue #66 1 rok temu



A URL shortener and (maybe) a pastebin server for our #ru community.


  • go get -u github.com/go-bindata/go-bindata/...
  • go generate ./...
  • go build ./cmd/rushlink


We recommend running rushlink behind a reverse proxy suitable for processing HTTP requests, such as nginx, or haproxy.

Sample nginx config

server {
    location / {
        root    /var/www/rushlink;
        proxy_set_header Host rushlink.local;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_http_version 1.1;

rushlink automatically detects whether http or https is used when X-Forwarded-Proto is correctly set. Otherwise, pass -root_url https://rushlink.local to the binary (e.g. in the systemd unit file).

Sample systemd unit file

As of 1fe9553cc9, rushlink expects its database and file store configuration in environment variables.


Environment=RUSHLINK_DATABASE_DRIVER=sqlite RUSHLINK_DATABASE_PATH=/var/lib/rushlink/rushlink.sqlite3 RUSHLINK_FILE_STORE_PATH=/var/lib/rushlink/filestore/
ExecStart=/var/lib/rushlink/rushlink -root_url https://rushlink.local



Use standard-Go-libraries if the job can be done with those. As of now, these are the exceptions:

  • github.com/gorilla/mux provides useful stuff for routing requests.
  • github.com/gorilla/sessions for session management.
  • go.etcd.io/bbolt is our database driver.
  • github.com/pkg/errors provides a Wrap function.
  • github.com/prometheus/client_golang/prometheus/... has easy Prometheus functionality.


Before 1fe9553cc9 we used go.etcd.io/bbolt. This file should be the only file apart from our monolithic binary. All settings and keys should go in here. Any read-only data resides in the binary file (possibly compressed).

Now, we use Gorm and support SQLite and PostgreSQL as backends.

We provide a migration binary in cmd/rushlink-migrate-db/. In environment variables, the destination database is configured, and the binary itself expects a few flags. Refer to the source for the exact flags.


All shortened URLs exist as a key on the root of the webserver, i.e. /xd42. That means that we have to separate every other page with some kind of namespace. Ideas:

  • /z/ reserved for flat pages.
  • /z/static/ reserved for "static files".

Paste types

Previous, I was planning to put pastes (not redirects) in a separate bucket and below a url namespace. Then when one was created, we would immediately generate a redirect link.

Turns out it's easier though to just save a unit (we call it a "paste") which can be of different types. For example:

  • Redirect
  • Paste
  • File
  • Image
  • Hypothetical other stuff:
    • Dead-drop
    • [...]?

Shorten keys and collisions

First of all: A sextet is a value of 6 bits.

For generating keys, we will initially generate a random value of 4 sextets, where the first bit is set to 0. If this collides with an existing key, we will generate a new one made out of 5 sextets, and set the prefix bits to 0b10. We will keep doing this until we don't have any collisions anymore.

To get proper-looking keys, we format the key to characters using the base64url alphabet described in (RFC4648, par. 5). The encoded value will be saved in the database.

UI design

As is tradition in a lot of URL-shortener/pastebin-like services, we will put everything in a single <pre> tag, and if possible, just serve text/plain. A good example is https://0x0.st.

The reason we would use text/html instead of text/plain is basically form submissions and JavaScript. Our main API should be cURL, but it would be useful if users could also use the website and/or drag-and-drop files and URLs.

On the other hand, using text/plain saves us so much effort, because we don't have to do any HTML/CSS/JavaScript. We have native terminal support, etc.

The best thing would probably to do both, and correctly listen to the Accept header that the client sends. We can still wrap the plain-text page in a single <pre> to keep it easy for ourselves.


  • If we can, we don't want to have user accounts. We store the sessions forever, and store a user's data in there, without having to collect personal data in any way.
  • URL-shortening links will be retained for always, unless the submitter revokes it, in which case it will be replaced by a 410 Gone page[*].
  • The probles of pastes are not solved. This is an unsolved problem[*].

[*] In any case, we going to comply with all European laws and reasonable requests for deletion.


We will try as hard as possible to not store any data about our users, and will only provide any data when we have the legal obligation to do so.