Eine PHP-Operationsklasse zum Abrufen von CRX-Dateiinformationen zur Google Chrome-Erweiterung

Diese Klasse implementiert das Abrufen der erweiterten App-ID aus der CRX-Datei, das Abrufen des Inhalts der Datei manifest.json und das Konvertieren der CRX-Datei in eine allgemeine ZIP-Datei

Der Code lautet wie folgt:

<?<span style="color: #000000;">php
</span><span style="color: #0000ff;">class</span> CrxParserException <span style="color: #0000ff;">extends</span> <span style="color: #0000ff;">Exception</span><span style="color: #000000;"> {

}

</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
 * Chrome crx 解析器，用于获取扩展、皮肤ID
 *
 </span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">class</span><span style="color: #000000;"> CrxParser {
    </span><span style="color: #0000ff;">const</span> MAX_PUBLIC_KEY_SIZE = 65535<span style="color: #000000;">;
    </span><span style="color: #0000ff;">const</span> MAX_SIGNATURE_SIZE  = 65535<span style="color: #000000;">;
    </span><span style="color: #0000ff;">const</span> HEADER_MAGIC_PREFIX = 'Cr24'<span style="color: #000000;">;
    </span><span style="color: #0000ff;">const</span> CURRENT_VERSION     = 2<span style="color: #000000;">;

    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$fp</span> = <span style="color: #0000ff;">null</span>; <span style="color: #008000;">//</span><span style="color: #008000;">文件指针</span>
    <span style="color: #0000ff;">private</span> <span style="color: #800080;">$filename</span> = ''; <span style="color: #008000;">//</span><span style="color: #008000;">文件路径</span>
    <span style="color: #0000ff;">private</span> <span style="color: #800080;">$_header</span> = <span style="color: #0000ff;">array</span>(); <span style="color: #008000;">//</span><span style="color: #008000;">crx 文件的头信息</span>

    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> __construct(<span style="color: #800080;">$filename</span><span style="color: #000000;">){
        </span><span style="color: #800080;">$this</span>->parse(<span style="color: #800080;">$filename</span><span style="color: #000000;">);
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 获取此应用的ID
     * @return string
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> getAppid() {
        </span><span style="color: #800080;">$hash</span> = hash('sha256',<span style="color: #800080;">$this</span>-><span style="color: #000000;">_key);
        </span><span style="color: #800080;">$hash</span> = <span style="color: #008080;">substr</span>(<span style="color: #800080;">$hash</span>,0,32<span style="color: #000000;">);

        </span><span style="color: #800080;">$length</span> = <span style="color: #008080;">strlen</span>(<span style="color: #800080;">$hash</span><span style="color: #000000;">);
        </span><span style="color: #800080;">$ascii_0</span> = <span style="color: #008080;">ord</span>('0'<span style="color: #000000;">);
        </span><span style="color: #800080;">$ascii_9</span> = <span style="color: #008080;">ord</span>('9'<span style="color: #000000;">);
        </span><span style="color: #800080;">$ascii_a</span> = <span style="color: #008080;">ord</span>('a'<span style="color: #000000;">);
        </span><span style="color: #800080;">$data</span> = ''<span style="color: #000000;">;
        </span><span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0;<span style="color: #800080;">$i</span><<span style="color: #800080;">$length</span>;<span style="color: #800080;">$i</span>++<span style="color: #000000;">) {
            </span><span style="color: #800080;">$c</span> = <span style="color: #008080;">ord</span>(<span style="color: #800080;">$hash</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">]);

            </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span> >= <span style="color: #800080;">$ascii_0</span> && <span style="color: #800080;">$c</span> <= <span style="color: #800080;">$ascii_9</span><span style="color: #000000;">) {
                </span><span style="color: #800080;">$d</span> = <span style="color: #008080;">chr</span>(<span style="color: #800080;">$ascii_a</span> + <span style="color: #800080;">$c</span> - <span style="color: #800080;">$ascii_0</span><span style="color: #000000;">);
            } </span><span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span> >= <span style="color: #800080;">$ascii_a</span> && <span style="color: #800080;">$c</span> < <span style="color: #800080;">$ascii_a</span> + 6<span style="color: #000000;">) {
                </span><span style="color: #800080;">$d</span> = <span style="color: #008080;">chr</span>(<span style="color: #800080;">$ascii_a</span> + <span style="color: #800080;">$c</span> - <span style="color: #800080;">$ascii_a</span> + 10<span style="color: #000000;">);
            } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> {
                </span><span style="color: #800080;">$d</span> = 'a'<span style="color: #000000;">;
            }
            </span><span style="color: #800080;">$data</span> .= <span style="color: #800080;">$d</span><span style="color: #000000;">;
        }
        </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$data</span><span style="color: #000000;">;
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 从crx文件中获取manifest.json文件的配置信息
     * @param unknown $zip_file
     * @return mixed[]
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">function</span> getConfig(<span style="color: #800080;">$key</span>=<span style="color: #0000ff;">null</span><span style="color: #000000;">){
        </span><span style="color: #800080;">$zip_file</span>=<span style="color: #008080;">tempnam</span>(<span style="color: #008080;">dirname</span>(<span style="color: #800080;">$this</span>->filename),'zip'<span style="color: #000000;">);
        </span><span style="color: #800080;">$manifest_arr</span>=<span style="color: #0000ff;">array</span><span style="color: #000000;">();
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$this</span>->convertToZip(<span style="color: #800080;">$zip_file</span><span style="color: #000000;">)){
            </span><span style="color: #800080;">$zip</span>=zip_open(<span style="color: #800080;">$zip_file</span><span style="color: #000000;">);
            </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_resource</span>(<span style="color: #800080;">$zip</span><span style="color: #000000;">)){
                </span><span style="color: #0000ff;">while</span>(<span style="color: #800080;">$zip_entry</span>=zip_read(<span style="color: #800080;">$zip</span><span style="color: #000000;">)){
                    </span><span style="color: #800080;">$entry_name</span>=zip_entry_name(<span style="color: #800080;">$zip_entry</span><span style="color: #000000;">);
                    </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">preg_match</span>('/manifest\.json$/', <span style="color: #800080;">$entry_name</span><span style="color: #000000;">)){
                        </span><span style="color: #800080;">$content</span>=zip_entry_read(<span style="color: #800080;">$zip_entry</span>, zip_entry_filesize(<span style="color: #800080;">$zip_entry</span><span style="color: #000000;">));
                        </span><span style="color: #800080;">$content_j</span>=json_decode(<span style="color: #800080;">$content</span>, <span style="color: #0000ff;">true</span><span style="color: #000000;">);
                        </span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$content_j</span><span style="color: #000000;">)){
                            </span><span style="color: #800080;">$manifest_arr</span>=<span style="color: #800080;">$content_j</span><span style="color: #000000;">;
                        }
                    }
                }
            }
            zip_close(</span><span style="color: #800080;">$zip</span><span style="color: #000000;">);
            </span><span style="color: #008080;">unlink</span>(<span style="color: #800080;">$zip_file</span><span style="color: #000000;">);
        }
        </span><span style="color: #0000ff;">return</span> <span style="color: #008080;">is_null</span>(<span style="color: #800080;">$key</span>) ? <span style="color: #800080;">$manifest_arr</span> : <span style="color: #800080;">$manifest_arr</span>[<span style="color: #800080;">$key</span><span style="color: #000000;">];
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 将文件转换为zip文件
     * @param unknown $target_path
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">function</span> convertToZip(<span style="color: #800080;">$target_path</span>=<span style="color: #0000ff;">null</span><span style="color: #000000;">){
        </span><span style="color: #800080;">$offset</span>=16+<span style="color: #800080;">$this</span>->_header['key_size']+<span style="color: #800080;">$this</span>->_header['sig_size'<span style="color: #000000;">];
        </span><span style="color: #800080;">$data</span>=<span style="color: #800080;">$this</span>->getContent(<span style="color: #800080;">$this</span>->filename,<span style="color: #800080;">$offset</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">return</span> !<span style="color: #008080;">is_null</span>(<span style="color: #800080;">$target_path</span>) ? <span style="color: #008080;">file_put_contents</span>(<span style="color: #800080;">$target_path</span>, <span style="color: #800080;">$data</span>) : <span style="color: #800080;">$data</span><span style="color: #000000;">;
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 开始解析该 crx 文件
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span> parse(<span style="color: #800080;">$filename</span><span style="color: #000000;">) {
        </span><span style="color: #0000ff;">if</span>(<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$filename</span>, '://')!==<span style="color: #0000ff;">false</span> && !<span style="color: #008080;">file_exists</span>(<span style="color: #800080;">$filename</span><span style="color: #000000;">)) {
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("parser init: crx file does not exisit"<span style="color: #000000;">);
        }
        </span><span style="color: #800080;">$this</span>->filename=<span style="color: #800080;">$filename</span><span style="color: #000000;">;
        </span><span style="color: #800080;">$this</span>->fp = <span style="color: #008080;">fopen</span>(<span style="color: #800080;">$filename</span>, 'r'<span style="color: #000000;">);
        </span><span style="color: #800080;">$this</span>->parse_header(); <span style="color: #008000;">//</span><span style="color: #008000;"> 解析头部信息</span>
        <span style="color: #800080;">$this</span>-><span style="color: #000000;">parse_key();
        </span><span style="color: #800080;">$this</span>-><span style="color: #000000;">parse_sig();
        </span><span style="color: #008080;">fclose</span>(<span style="color: #800080;">$this</span>-><span style="color: #000000;">fp);
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 解析头部信息，并设置 $_header 数组
     * @throws CrxParserException 解析错误抛出异常
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> parse_header() {
        </span><span style="color: #800080;">$data</span> = <span style="color: #008080;">fread</span>(<span style="color: #800080;">$this</span>->fp, 16); <span style="color: #008000;">//</span><span style="color: #008000;"> HEADER 头信息有16个字节</span>
        <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$data</span><span style="color: #000000;">) {
            </span><span style="color: #800080;">$data</span> = @<span style="color: #008080;">unpack</span>('C4prefix/Vversion/Vkey_size/Vsig_size',<span style="color: #800080;">$data</span><span style="color: #000000;">);
        }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("header parse: error reading header"<span style="color: #000000;">);
        }
        </span><span style="color: #008000;">//</span><span style="color: #008000;"> 前四个字节拼合 prefix</span>
        <span style="color: #800080;">$data</span>['prefix'] = <span style="color: #008080;">chr</span>( <span style="color: #800080;">$data</span>['prefix1'] ).<span style="color: #008080;">chr</span>( <span style="color: #800080;">$data</span>['prefix2'] ).<span style="color: #008080;">chr</span>( <span style="color: #800080;">$data</span>['prefix3'] ).<span style="color: #008080;">chr</span>( <span style="color: #800080;">$data</span>['prefix4'<span style="color: #000000;">] );
        </span><span style="color: #0000ff;">unset</span>(<span style="color: #800080;">$data</span>['prefix1'],<span style="color: #800080;">$data</span>['prefix2'],<span style="color: #800080;">$data</span>['prefix3'],<span style="color: #800080;">$data</span>['prefix4'<span style="color: #000000;">]);

        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$data</span>['prefix'] != self::<span style="color: #000000;">HEADER_MAGIC_PREFIX) {
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("header parse: illegal prefix"<span style="color: #000000;">);
        }
        </span><span style="color: #0000ff;">if</span>( <span style="color: #800080;">$data</span>['version'] != self::<span style="color: #000000;">CURRENT_VERSION ) {
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("header parse: illegal version"<span style="color: #000000;">);
        }
        </span><span style="color: #0000ff;">if</span><span style="color: #000000;">(
                </span><span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$data</span>['key_size']) || <span style="color: #800080;">$data</span>['key_size'] > self::MAX_PUBLIC_KEY_SIZE ||
                <span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$data</span>['sig_size']) || <span style="color: #800080;">$data</span>['sig_size'] > self::<span style="color: #000000;">MAX_SIGNATURE_SIZE
                ){
                    </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("header parse: illegal public key size or signature size"<span style="color: #000000;">);
        }
        </span><span style="color: #800080;">$this</span>->_header = <span style="color: #800080;">$data</span><span style="color: #000000;">;
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 解析key
     * @throws CrxParserException
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> parse_key() {
        </span><span style="color: #800080;">$key</span> = <span style="color: #008080;">fread</span>(<span style="color: #800080;">$this</span>->fp,<span style="color: #800080;">$this</span>->_header['key_size'<span style="color: #000000;">]);
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$key</span><span style="color: #000000;">) {
            </span><span style="color: #800080;">$this</span>->_key = <span style="color: #800080;">$key</span><span style="color: #000000;">;
        }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("key parse: error reading key"<span style="color: #000000;">);
        }
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 解析sig
     * @throws CrxParserException
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> parse_sig() {
        </span><span style="color: #800080;">$sig</span> = <span style="color: #008080;">fread</span>(<span style="color: #800080;">$this</span>->fp,<span style="color: #800080;">$this</span>->_header['sig_size'<span style="color: #000000;">]);
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$sig</span><span style="color: #000000;">) {
            </span><span style="color: #800080;">$this</span>->_sig = <span style="color: #800080;">$sig</span><span style="color: #000000;">;
        }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{
            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> CrxParserException("sig parse: error reading sig"<span style="color: #000000;">);
        }
    }

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">*
     * 从文件中获取指定位置及大小的内容
     * @param unknown $filename
     * @param number $offset
     * @param unknown $length
     * @return string
     </span><span style="color: #008000;">*/</span>
    <span style="color: #0000ff;">private</span> <span style="color: #0000ff;">function</span> getContent(<span style="color: #800080;">$filename</span>,<span style="color: #800080;">$offset</span>=0,<span style="color: #800080;">$length</span>=-1<span style="color: #000000;">){
        </span><span style="color: #800080;">$stream</span> = <span style="color: #008080;">fopen</span>(<span style="color: #800080;">$filename</span>, 'rb'<span style="color: #000000;">);
        </span><span style="color: #800080;">$content</span> = <span style="color: #008080;">stream_get_contents</span>(<span style="color: #800080;">$stream</span>, <span style="color: #800080;">$length</span>, <span style="color: #800080;">$offset</span><span style="color: #000000;">);
        </span><span style="color: #008080;">fclose</span>(<span style="color: #800080;">$stream</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$content</span><span style="color: #000000;">;
    }

}</span>

Anwendung:

<?<span style="color: #000000;">php
</span><span style="color: #800080;">$crxParser</span>=<span style="color: #0000ff;">new</span> CrxParser('abc.crx'<span style="color: #000000;">);
</span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$crxParser</span>-><span style="color: #000000;">getAppid();
</span><span style="color: #008080;">var_dump</span>(<span style="color: #800080;">$crxParser</span>-><span style="color: #000000;">getConfig());
</span><span style="color: #008000;">//</span><span style="color: #008000;">$crxParser->convertToZip('abc.zip');</span>