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| 1 | <?php |
| 2 | namespace Ably; |
| 3 | |
| 4 | use Ably\Models\ClientOptions; |
| 5 | use Ably\Models\PaginatedResult; |
| 6 | use Ably\Models\HttpPaginatedResponse; |
| 7 | use Ably\Exceptions\AblyException; |
| 8 | use Ably\Exceptions\AblyRequestException; |
| 9 | |
| 10 | /** |
| 11 | * Ably REST client |
| 12 | */ |
| 13 | class AblyRest { |
| 14 | |
| 15 | const API_VERSION = '1.0'; |
| 16 | const LIB_VERSION = '1.0.1'; |
| 17 | |
| 18 | protected $options; |
| 19 | protected static $libFlavour = ''; |
| 20 | |
| 21 | /** |
| 22 | * @var \Ably\Http $http object for making HTTP requests |
| 23 | */ |
| 24 | public $http; |
| 25 | /** |
| 26 | * @var \Ably\Auth $auth object providing authorisation functionality |
| 27 | */ |
| 28 | public $auth; |
| 29 | /** |
| 30 | * @var \Ably\Channels $channels object for creating and releasing channels |
| 31 | */ |
| 32 | public $channels; |
| 33 | |
| 34 | /** |
| 35 | * Constructor |
| 36 | * @param \Ably\Models\ClientOptions|string array with options or a string with app key or token |
| 37 | */ |
| 38 | public function __construct( $options = [] ) { |
| 39 | |
| 40 | # convert to options if a single key is provided |
| 41 | if ( is_string( $options ) ) { |
| 42 | if ( strpos( $options, ':' ) === false ) { |
| 43 | $options = [ 'token' => $options ]; |
| 44 | } else { |
| 45 | $options = [ 'key' => $options ]; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | $this->options = new ClientOptions( $options ); |
| 50 | |
| 51 | Log::setLogLevel( $this->options->logLevel ); |
| 52 | if ( !empty( $this->options->logHandler ) ) { |
| 53 | Log::setLogCallback( $this->options->logHandler ); |
| 54 | } else { |
| 55 | Log::setLogCallback( null ); |
| 56 | } |
| 57 | |
| 58 | $httpClass = $this->options->httpClass; |
| 59 | $this->http = new $httpClass( $this->options ); |
| 60 | $authClass = $this->options->authClass; |
| 61 | $this->auth = new $authClass( $this, $this->options ); |
| 62 | $this->channels = new Channels( $this ); |
| 63 | |
| 64 | return $this; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Shorthand to $this->channels->get() |
| 69 | * @return \Ably\Channel Channel |
| 70 | */ |
| 71 | public function channel( $name, $options = [] ) { |
| 72 | return $this->channels->get( $name, $options ); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Gets application-level usage statistics , covering messages sent |
| 77 | * and received, API requests and connections |
| 78 | * @return array Statistics |
| 79 | */ |
| 80 | public function stats( $params = [] ) { |
| 81 | return new PaginatedResult( $this, 'Ably\Models\Stats', $cipher = false, 'GET', '/stats', $params ); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Retrieves server time |
| 86 | * @return integer server time in milliseconds |
| 87 | */ |
| 88 | public function time() { |
| 89 | $res = $this->get( '/time', $params = [], $headers = [], $returnHeaders = false, $authHeaders = false ); |
| 90 | return $res[0]; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Returns local time |
| 95 | * @return integer system time in milliseconds |
| 96 | */ |
| 97 | public function systemTime() { |
| 98 | return round( microtime(true) * 1000 ); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Does a GET request, automatically injecting auth headers and handling fallback on server failure |
| 103 | * @see AblyRest::request() |
| 104 | */ |
| 105 | public function get( $path, $headers = [], $params = [], $returnHeaders = false, $auth = true ) { |
| 106 | return $this->requestInternal( 'GET', $path, $headers, $params, $returnHeaders, $auth ); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Does a POST request, automatically injecting auth headers and handling fallback on server failure |
| 111 | * @see AblyRest::request() |
| 112 | */ |
| 113 | public function post( $path, $headers = [], $params = [], $returnHeaders = false, $auth = true ) { |
| 114 | return $this->requestInternal( 'POST', $path, $headers, $params, $returnHeaders, $auth ); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Does a HTTP request, automatically injecting auth headers and handling fallback on server failure. |
| 119 | * This method is used internally and `request` is the preferable method to use. |
| 120 | * |
| 121 | * @param string $method HTTP method (GET, POST, PUT, DELETE, ...) |
| 122 | * @param string $path root-relative path, e.g. /channels/example/messages |
| 123 | * @param array $headers HTTP headers to send |
| 124 | * @param array|string $params Array of parameters to submit or a JSON string |
| 125 | * @param boolean $returnHeaders if true, returns both headers and body as array, otherwise returns just body |
| 126 | * @param boolean $auth if authentication headers should be automatically injected |
| 127 | * @return mixed either array with 'headers' and 'body' fields or just body, depending on $returnHeaders, body is automatically decoded |
| 128 | * @throws AblyRequestException if the request fails |
| 129 | */ |
| 130 | public function requestInternal( $method, $path, $headers = [], $params = [], $returnHeaders = false, $auth = true ) { |
| 131 | $mergedHeaders = array_merge( [ |
| 132 | 'Accept', 'application/json', |
| 133 | 'X-Ably-Version' => self::API_VERSION, |
| 134 | 'X-Ably-Lib' => 'php-' . self::$libFlavour . self::LIB_VERSION, |
| 135 | ], $headers ); |
| 136 | |
| 137 | if ( $auth ) { // inject auth headers |
| 138 | $mergedHeaders = array_merge( $this->auth->getAuthHeaders(), $mergedHeaders ); |
| 139 | } |
| 140 | |
| 141 | try { |
| 142 | if ( !empty( $this->options->fallbackHosts ) ) { |
| 143 | $res = $this->requestWithFallback( $method, $path, $mergedHeaders, $params ); |
| 144 | } else { |
| 145 | $server = ($this->options->tls ? 'https://' : 'http://') . $this->options->restHost; |
| 146 | |
| 147 | if ( $this->options->tls && !empty( $this->options->tlsPort ) ) { |
| 148 | $server .= ':' . $this->options->tlsPort; |
| 149 | } |
| 150 | if ( !$this->options->tls && !empty( $this->options->port ) ) { |
| 151 | $server .= ':' . $this->options->port; |
| 152 | } |
| 153 | |
| 154 | $res = $this->http->request( $method, $server . $path, $mergedHeaders, $params ); |
| 155 | } |
| 156 | } catch (AblyRequestException $e) { |
| 157 | // check if the exception was caused by an expired token = authorised request + using token auth + specific error message |
| 158 | $res = $e->getResponse(); |
| 159 | |
| 160 | $causedByExpiredToken = $auth |
| 161 | && !$this->auth->isUsingBasicAuth() |
| 162 | && ($e->getCode() >= 40140) |
| 163 | && ($e->getCode() < 40150); |
| 164 | |
| 165 | if ( $causedByExpiredToken ) { // renew the token |
| 166 | $this->auth->authorize(); |
| 167 | |
| 168 | // merge headers now and use auth = false to prevent potential endless recursion |
| 169 | $mergedHeaders = array_merge( $this->auth->getAuthHeaders(), $headers ); |
| 170 | |
| 171 | return $this->requestInternal( $method, $path, $mergedHeaders, $params, $returnHeaders, $auth = false ); |
| 172 | } else { |
| 173 | throw $e; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | if (!$returnHeaders) { |
| 178 | $res = $res['body']; |
| 179 | } |
| 180 | return $res; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Does an HTTP request with automatic pagination, automatically injected |
| 185 | * auth headers and automatic server failure handling using fallbackHosts. |
| 186 | * |
| 187 | * @param string $method HTTP method (GET, POST, PUT, DELETE, ...) |
| 188 | * @param string $path root-relative path, e.g. /channels/example/messages |
| 189 | * @param array $params GET parameters to append to $path |
| 190 | * @param array|object $body JSON-encodable structure to send in the body - leave empty for GET requests |
| 191 | * @param array $headers HTTP headers to send |
| 192 | * @return \Ably\Models\HttpPaginatedResponse |
| 193 | * @throws AblyRequestException This exception is only thrown for status codes >= 500 |
| 194 | */ |
| 195 | public function request( $method, $path, $params = [], $body = '', $headers = []) { |
| 196 | if ( count( $params ) ) { |
| 197 | $path .= '?' . http_build_query( $params ); |
| 198 | } |
| 199 | |
| 200 | if ( $method == 'GET' && $body ) { |
| 201 | throw new AblyException( 'GET requests cannot have a JSON body', 400, 40000 ); |
| 202 | } |
| 203 | |
| 204 | if ( !is_string( $body ) ) { |
| 205 | $body = json_encode( $body ); |
| 206 | } |
| 207 | |
| 208 | return new HttpPaginatedResponse( $this, 'Ably\Models\Untyped', null, $method, $path, $body, $headers ); |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Does a HTTP request backed up by fallback servers |
| 213 | */ |
| 214 | protected function requestWithFallback( $method, $path, $headers = [], $params = [], $attempt = 0 ) { |
| 215 | try { |
| 216 | if ( $attempt == 0 ) { // using default host |
| 217 | $server = ($this->options->tls ? 'https://' : 'http://') . $this->options->restHost; |
| 218 | } else { // using a fallback host |
| 219 | Log::d( 'Connection failed, attempting with fallback server #' . $attempt ); |
| 220 | // attempt 1 uses fallback host with index 0 |
| 221 | $server = ($this->options->tls ? 'https://' : 'http://') . $this->options->fallbackHosts[$attempt - 1]; |
| 222 | } |
| 223 | |
| 224 | return $this->http->request( $method, $server . $path, $headers, $params ); |
| 225 | } |
| 226 | catch (AblyRequestException $e) { |
| 227 | if ( $e->getCode() >= 50000 ) { |
| 228 | if ( $attempt < min( $this->options->httpMaxRetryCount, count( $this->options->fallbackHosts ) ) ) { |
| 229 | return $this->requestWithFallback( $method, $path, $headers, $params, $attempt + 1); |
| 230 | } else { |
| 231 | Log::e( 'Failed to connect to server and all of the fallback servers.' ); |
| 232 | throw $e; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | throw $e; // other error code than timeout, rethrow exception |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Sets a "flavour string", that is sent in the `X-Ably-Lib` request header. |
| 242 | * Used for internal statistics. |
| 243 | * For instance setting 'laravel' results in: `X-Ably-Lib: php-laravel-1.0.0` |
| 244 | */ |
| 245 | public static function setLibraryFlavourString( $flavour = '' ) { |
| 246 | self::$libFlavour = $flavour ? $flavour.'-' : ''; |
| 247 | } |
| 248 | } |