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#REST API
## Usage
See the [REST API documentation](http://shaarli.github.io/api-documentation/).[](.html)
## Authentication
All requests to Shaarli's API must include a JWT token to verify their authenticity.
This token has to be included as an HTTP header called `Authentication: Bearer <jwt token>`.
JWT resources :
* [jwt.io](https://jwt.io) (including a list of client per language).[](.html)
* RFC : https://tools.ietf.org/html/rfc7519
* https://float-middle.com/json-web-tokens-jwt-vs-sessions/
* HackerNews thread: https://news.ycombinator.com/item?id=11929267
### Shaarli JWT Token
JWT tokens are composed by three parts, separated by a dot `.` and encoded in base64:
```
[header].[payload].[signature][](.html)
```
#### Header
Shaarli only allow one hash algorithm, so the header will always be the same:
```json
{
"typ": "JWT",
"alg": "HS512"
}
```
Encoded in base64, it gives:
```
ewogICAgICAgICJ0eXAiOiAiSldUIiwKICAgICAgICAiYWxnIjogIkhTNTEyIgogICAgfQ==
```
#### Payload
**Validity duration**
To avoid infinite token validity, JWT tokens must include their creation date in UNIX timestamp format (timezone independant - UTC) under the key `iat` (issued at). This token will be accepted during 9 minutes.
```json
{
"iat": 1468663519
}
```
See [RFC reference](https://tools.ietf.org/html/rfc7519#section-4.1.6).[](.html)
#### Signature
The signature authenticate the token validity. It contains the base64 of the header and the body, separated by a dot `.`, hashed in SHA512 with the API secret available in Shaarli administration page.
Signature example with PHP:
```php
$content = base64_encode($header) . '.' . base64_encode($payload);
$signature = hash_hmac('sha512', $content, $secret);
```
### Complete example
#### PHP
```php
function generateToken($secret) {
$header = base64_encode('{
"typ": "JWT",
"alg": "HS512"
}');
$payload = base64_encode('{
"iat": '. time() .'
}');
$signature = hash_hmac('sha512', $header .'.'. $payload , $secret);
return $header .'.'. $payload .'.'. $signature;
}
$secret = 'mysecret';
$token = generateToken($secret);
echo $token;
```
> `ewogICAgICAgICJ0eXAiOiAiSldUIiwKICAgICAgICAiYWxnIjogIkhTNTEyIgogICAgfQ==.ewogICAgICAgICJpYXQiOiAxNDY4NjY3MDQ3CiAgICB9.1d2c54fa947daf594fdbf7591796195652c8bc63bffad7f6a6db2a41c313f495a542cbfb595acade79e83f3810d709b4251d7b940bbc10b531a6e6134af63a68`
```php
$options = [[](.html)
'http' => [[](.html)
'method' => 'GET',
'jwt' => $token,
],
];
$context = stream_context_create($options);
file_get_contents($apiEndpoint, false, $context);
```
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