抖音数据采集教程，逆向钻研X-Gorgon,X-Khronos算法协定
抖音的接口中，通过抓包抖音申请时，能够发现x-gorgon和 xlog两大参数是必备的，尽管说目前有些接口不通过这两个参数还是能够拿到数据，然而我感觉抖音曾经预留显示了这两大申请的参数，只会逐步提高要求，用于服务器验证，不然日后都无奈申请到数据，通过工具逆向反编译出了抖音app的源码，发现下列这个位于类com.ss.sys.ces.gg.tt中，有这样一个函数用于生成x-gorgon的值。
public static void init_gorgon() { com.bytedance.frameworks.baselib.network.http.e.j = new e.a() { public final Map<String, String> a(String paramAnonymousString, Map<String, List<String>> paramAnonymousMap) { HashMap localHashMap = new HashMap(); for (;;) { try { if ((!paramAnonymousString.toLowerCase().contains("http")) && (!paramAnonymousString.toLowerCase().contains("https"))) { throw new NullPointerException("nein http/https"); } if ((paramAnonymousString.toLowerCase().contains("X-Khronos")) && (paramAnonymousString.toLowerCase().contains("X-Gorgon"))) { throw new NullPointerException("it was"); } if (!tt.a(paramAnonymousString)) { int i = (int)(System.currentTimeMillis() / 1000L); paramAnonymousString = tt.b(paramAnonymousString); localObject2 = null; if ((paramAnonymousString != null) && (paramAnonymousString.length() > 0)) { localObject1 = d.a(paramAnonymousString); Iterator localIterator = paramAnonymousMap.entrySet().iterator(); paramAnonymousMap = null; paramAnonymousString = paramAnonymousMap; if (localIterator.hasNext()) { Object localObject4 = (Map.Entry)localIterator.next(); localObject3 = localObject2; if (((String)((Map.Entry)localObject4).getKey()).toUpperCase().contains("X-SS-STUB")) { localObject3 = (String)((List)((Map.Entry)localObject4).getValue()).get(0); } localObject2 = localObject3; if (!((String)((Map.Entry)localObject4).getKey()).toUpperCase().contains("COOKIE")) { continue; } String str = (String)((List)((Map.Entry)localObject4).getValue()).get(0); localObject2 = localObject3; if (str == null) { continue; } localObject2 = localObject3; if (str.length() <= 0) { continue; } localObject4 = d.a(str); str = tt.c(str); localObject2 = localObject3; paramAnonymousMap = (Map<String, List<String>>)localObject4; if (str == null) { continue; } localObject2 = localObject3; paramAnonymousMap = (Map<String, List<String>>)localObject4; if (str.length() <= 0) { continue; } paramAnonymousString = d.a(str); StcSDKFactory.getInstance().setSession(str); localObject2 = localObject3; paramAnonymousMap = (Map<String, List<String>>)localObject4; continue; } localObject3 = new StringBuilder(); ((StringBuilder)localObject3).append(i); localHashMap.put("X-Khronos", ((StringBuilder)localObject3).toString()); if (localObject1 == null) { break label572; } localObject3 = localObject1; if (((String)localObject1).length() == 0) { break label572; } if (localObject2 == null) { break label579; } localObject1 = localObject2; if (((String)localObject2).length() == 0) { break label579; } if (paramAnonymousMap == null) { break label586; } localObject2 = paramAnonymousMap; if (paramAnonymousMap.length() == 0) { break label586; } if (paramAnonymousString == null) { break label593; } paramAnonymousMap = paramAnonymousString; if (paramAnonymousString.length() == 0) { break label593; } if (b.a().a) { Calendar.getInstance().getTimeInMillis(); } paramAnonymousString = new StringBuilder(); paramAnonymousString.append((String)localObject3); paramAnonymousString.append((String)localObject1); paramAnonymousString.append((String)localObject2); paramAnonymousString.append(paramAnonymousMap); paramAnonymousString = com.ss.a.b.a.a(com.ss.sys.ces.a.leviathan(i, com.ss.a.b.a.a(paramAnonymousString.toString()))); if (b.a().a) { Calendar.getInstance().getTimeInMillis(); } localHashMap.put("X-Gorgon", paramAnonymousString); return localHashMap; } } else { throw new NullPointerException("filter_1"); } } catch (Throwable paramAnonymousString) { paramAnonymousString.getMessage().contains("filter_1"); return localHashMap; } Object localObject1 = null; continue; label572: Object localObject3 = "00000000000000000000000000000000"; continue; label579: localObject1 = "00000000000000000000000000000000"; continue; label586: Object localObject2 = "00000000000000000000000000000000"; continue; label593: paramAnonymousMap = "00000000000000000000000000000000"; } } }; }
对应的就是底层.so文件了
通过剖析晓得，最终的x-gorgon的生成，是调用com.ss.sys.ces.a.leviathan函数，所以咱们只有利用这个函数就能帮咱们解决x-gorgon的生成，他外面的参数有两个
public static native byte[] leviathan(int paramInt, byte[] paramArrayOfByte);
第一个是以后的工夫戳，也就是X-Khronos
第二个字节组就一串字符串，由Url、postdata、cookies和sesseionid别离进行MD5加密组成的字串，做的二次申请。
所以也就发现了X-SS-STUB的值是将要post的数据做md5计算的值，如果是要做post的话，那这个值就须要带上。就能失常申请到数据了。目前有了点小成绩，具体细节就不公开了。
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