shlink/README.md

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![Shlink](https://raw.githubusercontent.com/shlinkio/shlink.io/master/public/images/shlink-hero.png)
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A PHP-based self-hosted URL shortener that can be used to serve shortened URLs under your own custom domain.
> This document references Shlink 2.x. If you are using an older version and want to upgrade, follow the [UPGRADE](UPGRADE.md) doc.
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## Table of Contents
- [Installation](#installation)
- [Download](#download)
- [Configure](#configure)
- [Serve](#serve)
- [Bonus](#bonus)
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- [Update to new version](#update-to-new-version)
- [Using a docker image](#using-a-docker-image)
- [Using shlink](#using-shlink)
- [Shlink CLI Help](#shlink-cli-help)
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## Installation
> These are the steps needed to install Shlink if you plan to manually host it.
>
> Alternatively, you can use the official docker image. If that's your intention, jump directly to [Using a docker image](#using-a-docker-image)
First, make sure the host where you are going to run shlink fulfills these requirements:
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* PHP 7.4 or greater with JSON, APCu, intl, curl, PDO and gd extensions enabled.
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* MySQL, MariaDB, PostgreSQL or SQLite.
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* The web server of your choice with PHP integration (Apache or Nginx recommended).
### Download
In order to run Shlink, you will need a built version of the project. There are two ways to get it.
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* **Using a dist file**
The easiest way to install shlink is by using one of the pre-bundled distributable packages.
Go to the [latest version](https://github.com/shlinkio/shlink/releases/latest) and download the `shlink_x.x.x_dist.zip` file you will find there.
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Finally, decompress the file in the location of your choice.
* **Building from sources**
If for any reason you want to build the project yourself, follow these steps:
* Clone the project with git (`git clone https://github.com/shlinkio/shlink.git`), or download it by clicking the **Clone or download** green button.
* Download the [Composer](https://getcomposer.org/download/) PHP package manager inside the project folder.
* Run `./build.sh 1.0.0`, replacing the version with the version number you are going to build (the version number is only used for the generated dist file).
After that, you will have a `shlink_x.x.x_dist.zip` dist file inside the `build` directory, that you need to decompress in the location fo your choice.
> This is the process used when releasing new shlink versions. After tagging the new version with git, the Github release is automatically created by [travis](https://travis-ci.org/shlinkio/shlink), attaching the generated dist file to it.
### Configure
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Despite how you built the project, you now need to configure it, by following these steps:
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* If you are going to use MySQL, MariaDB or PostgreSQL, create an empty database with the name of your choice.
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* Recursively grant write permissions to the `data` directory. Shlink uses it to cache some information.
* Setup the application by running the `bin/install` script. It is a command line tool that will guide you through the installation process. **Take into account that this tool has to be run directly on the server where you plan to host Shlink. Do not run it before uploading/moving it there.**
* Generate your first API key by running `bin/cli api-key:generate`. You will need the key in order to interact with shlink's API.
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### Serve
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Once Shlink is configured, you need to expose it to the web, either by using a traditional web server + fast CGI approach, or by using a [swoole](https://www.swoole.co.uk/) non-blocking server.
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* **Using a web server:**
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For example, assuming your domain is doma.in and shlink is in the `/path/to/shlink` folder, these would be the basic configurations for Nginx and Apache.
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*Nginx:*
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```nginx
server {
server_name doma.in;
listen 80;
root /path/to/shlink/public;
index index.php;
charset utf-8;
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location / {
try_files $uri $uri/ /index.php$is_args$args;
}
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location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
fastcgi_index index.php;
include fastcgi.conf;
}
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location ~ /\.ht {
deny all;
}
}
```
*Apache:*
```apache
<VirtualHost *:80>
ServerName doma.in
DocumentRoot "/path/to/shlink/public"
<Directory "/path/to/shlink/public">
Options FollowSymLinks Includes ExecCGI
AllowOverride all
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
```
* **Using swoole:**
First you need to install the swoole PHP extension with [pecl](https://pecl.php.net/package/swoole), `pecl install swoole`.
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Once installed, it's actually pretty easy to get shlink up and running with swoole. Run `./vendor/bin/mezzio-swoole start -d` and you will get shlink running on port 8080.
However, by doing it this way, you are loosing all the access logs, and the service won't be automatically run if the server has to be restarted.
For that reason, you should create a daemon script, in `/etc/init.d/shlink_swoole`, like this one, replacing `/path/to/shlink` by the path to your shlink installation:
```bash
#!/bin/bash
### BEGIN INIT INFO
# Provides: shlink_swoole
# Required-Start: $local_fs $network $named $time $syslog
# Required-Stop: $local_fs $network $named $time $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: Shlink non-blocking server with swoole
### END INIT INFO
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SCRIPT=/path/to/shlink/vendor/bin/mezzio-swoole\ start
RUNAS=root
PIDFILE=/var/run/shlink_swoole.pid
LOGDIR=/var/log/shlink
LOGFILE=${LOGDIR}/shlink_swoole.log
start() {
if [[ -f "$PIDFILE" ]] && kill -0 $(cat "$PIDFILE"); then
echo 'Shlink with swoole already running' >&2
return 1
fi
echo 'Starting shlink with swoole' >&2
mkdir -p "$LOGDIR"
touch "$LOGFILE"
local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
su -c "$CMD" $RUNAS > "$PIDFILE"
echo 'Shlink started' >&2
}
stop() {
if [[ ! -f "$PIDFILE" ]] || ! kill -0 $(cat "$PIDFILE"); then
echo 'Shlink with swoole not running' >&2
return 1
fi
echo 'Stopping shlink with swoole' >&2
kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
echo 'Shlink stopped' >&2
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
*)
echo "Usage: $0 {start|stop|restart}"
esac
```
Then run these commands to enable the service and start it:
* `sudo chmod +x /etc/init.d/shlink_swoole`
* `sudo update-rc.d shlink_swoole defaults`
* `sudo update-rc.d shlink_swoole enable`
* `/etc/init.d/shlink_swoole start`
Now again, you can access shlink on port 8080, but this time the service will be automatically run at system start-up, and all access logs will be written in `/var/log/shlink/shlink_swoole.log` (you will probably want to [rotate those logs](https://www.digitalocean.com/community/tutorials/how-to-manage-logfiles-with-logrotate-on-ubuntu-16-04). You can find an example logrotate config file [here](data/infra/examples/shlink-daemon-logrotate.conf)).
Finally access to [https://app.shlink.io](https://app.shlink.io) and configure your server to start creating short URLs.
### Bonus
Geo-locating visits to your short links is a time-consuming task. When serving Shlink with swoole, the geo-location task is automatically run asynchronously just after a visit to a short URL happens.
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However, if you are not serving Shlink with swoole, you will have to schedule the geo-location task to be run regularly in the background (for example, using cron jobs):
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The command you need to run is `/path/to/shlink/bin/cli visit:locate`, and you can optionally provide the `-q` flag to remove any output and avoid your cron logs to be polluted.
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## Update to new version
When a new Shlink version is available, you don't need to repeat the entire process. Instead, follow these steps:
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1. Rename your existing Shlink directory to something else (ie. `shlink` ---> `shlink-old`).
2. Download and extract the new version of Shlink, and set the directory name to that of the old version (ie. `shlink`).
3. Run the `bin/update` script in the new version's directory to migrate your configuration over. You will be asked to provide the path to the old instance (ie. `shlink-old`).
4. If you are using shlink with swoole, restart the service by running `/etc/init.d/shlink_swoole restart`.
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The `bin/update` will use the location from previous shlink version to import the configuration. It will then update the database and generate some assets shlink needs to work.
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**Important!** It is recommended that you don't skip any version when using this process. The update tool gets better on every version, but older versions might make assumptions.
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## Using a docker image
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Starting with version 1.15.0, an official docker image is provided. You can learn how to use it by reading [the docs](docker/README.md).
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The idea is that you can just generate a container using the image and provide custom config via env vars.
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## Using shlink
Once shlink is installed, there are two main ways to interact with it:
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* **The command line**. Try running `bin/cli` and see all the [available commands](#shlink-cli-help).
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All of those commands can be run with the `--help`/`-h` flag in order to see how to use them and all the available options.
It is probably a good idea to symlink the CLI entry point (`bin/cli`) to somewhere in your path, so that you can run shlink from any directory.
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* **The REST API**. The complete docs on how to use the API can be found [here](https://shlink.io/api-docs), and a sandbox which also documents every endpoint can be found in the [API Spec](https://api-spec.shlink.io/) portal.
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However, you probably don't want to consume the raw API yourself. That's why a nice [web client](https://github.com/shlinkio/shlink-web-client) is provided that can be directly used from [https://app.shlink.io](https://app.shlink.io), or you can host it yourself too.
Both the API and CLI allow you to do the same operations, except for API key management, which can be done from the command line interface only.
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### Shlink CLI Help
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```
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Usage:
command [options] [arguments]
Options:
-h, --help Display this help message
-q, --quiet Do not output any message
-V, --version Display this application version
--ansi Force ANSI output
--no-ansi Disable ANSI output
-n, --no-interaction Do not ask any interactive question
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
Available commands:
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help Displays help for a command
list Lists commands
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api-key
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api-key:disable Disables an API key.
api-key:generate Generates a new valid API key.
api-key:list Lists all the available API keys.
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db
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db:create Creates the database needed for shlink to work. It will do nothing if the database already exists
db:migrate Runs database migrations, which will ensure the shlink database is up to date.
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short-url
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short-url:delete Deletes a short URL
short-url:generate Generates a short URL for provided long URL and returns it
short-url:list List all short URLs
short-url:parse Returns the long URL behind a short code
short-url:visits Returns the detailed visits information for provided short code
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tag
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tag:create Creates one or more tags.
tag:delete Deletes one or more tags.
tag:list Lists existing tags.
tag:rename Renames one existing tag.
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visit
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visit:locate Resolves visits origin locations.
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```
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> This product includes GeoLite2 data created by MaxMind, available from [https://www.maxmind.com](https://www.maxmind.com)