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@@ -0,0 +1,287 @@
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+import ctypes
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+import json
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+import random
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+import time
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+import urllib.parse
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+
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+
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+def sign(a1="", b1="", x_s="", x_t=""):
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+ """
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+ takes in a URI (uniform resource identifier), an optional data dictionary, and an optional ctime parameter. It returns a dictionary containing two keys: "x-s" and "x-t".
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+ """
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+ common = {
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+ "s0": 3, # getPlatformCode
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+ "s1": "",
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+ "x0": "1", # localStorage.getItem("b1b1")
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+ "x1": "3.7.8-2", # version
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+ "x2": "Mac OS",
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+ "x3": "xhs-pc-web",
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+ "x4": "4.27.2",
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+ "x5": a1, # cookie of a1
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+ "x6": x_t,
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+ "x7": x_s,
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+ "x8": b1, # localStorage.getItem("b1")
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+ "x9": mrc(x_t + x_s + b1),
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+ "x10": 154, # getSigCount
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+ }
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+ encode_str = encodeUtf8(json.dumps(common, separators=(',', ':')))
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+ x_s_common = b64Encode(encode_str)
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+ x_b3_traceid = get_b3_trace_id()
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+ return {
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+ "x-s": x_s,
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+ "x-t": x_t,
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+ "x-s-common": x_s_common,
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+ "x-b3-traceid": x_b3_traceid
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+ }
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+
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+
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+def get_b3_trace_id():
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+ re = "abcdef0123456789"
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+ je = 16
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+ e = ""
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+ for t in range(16):
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+ e += re[random.randint(0, je - 1)]
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+ return e
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+
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+
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+def mrc(e):
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+ ie = [
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+ 0, 1996959894, 3993919788, 2567524794, 124634137, 1886057615, 3915621685,
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+ 2657392035, 249268274, 2044508324, 3772115230, 2547177864, 162941995,
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+ 2125561021, 3887607047, 2428444049, 498536548, 1789927666, 4089016648,
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+ 2227061214, 450548861, 1843258603, 4107580753, 2211677639, 325883990,
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+ 1684777152, 4251122042, 2321926636, 335633487, 1661365465, 4195302755,
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+ 2366115317, 997073096, 1281953886, 3579855332, 2724688242, 1006888145,
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+ 1258607687, 3524101629, 2768942443, 901097722, 1119000684, 3686517206,
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+ 2898065728, 853044451, 1172266101, 3705015759, 2882616665, 651767980,
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+ 1373503546, 3369554304, 3218104598, 565507253, 1454621731, 3485111705,
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+ 3099436303, 671266974, 1594198024, 3322730930, 2970347812, 795835527,
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+ 1483230225, 3244367275, 3060149565, 1994146192, 31158534, 2563907772,
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+ 4023717930, 1907459465, 112637215, 2680153253, 3904427059, 2013776290,
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+ 251722036, 2517215374, 3775830040, 2137656763, 141376813, 2439277719,
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+ 3865271297, 1802195444, 476864866, 2238001368, 4066508878, 1812370925,
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+ 453092731, 2181625025, 4111451223, 1706088902, 314042704, 2344532202,
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+ 4240017532, 1658658271, 366619977, 2362670323, 4224994405, 1303535960,
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+ 984961486, 2747007092, 3569037538, 1256170817, 1037604311, 2765210733,
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+ 3554079995, 1131014506, 879679996, 2909243462, 3663771856, 1141124467,
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+ 855842277, 2852801631, 3708648649, 1342533948, 654459306, 3188396048,
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+ 3373015174, 1466479909, 544179635, 3110523913, 3462522015, 1591671054,
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+ 702138776, 2966460450, 3352799412, 1504918807, 783551873, 3082640443,
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+ 3233442989, 3988292384, 2596254646, 62317068, 1957810842, 3939845945,
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+ 2647816111, 81470997, 1943803523, 3814918930, 2489596804, 225274430,
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+ 2053790376, 3826175755, 2466906013, 167816743, 2097651377, 4027552580,
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+ 2265490386, 503444072, 1762050814, 4150417245, 2154129355, 426522225,
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+ 1852507879, 4275313526, 2312317920, 282753626, 1742555852, 4189708143,
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+ 2394877945, 397917763, 1622183637, 3604390888, 2714866558, 953729732,
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+ 1340076626, 3518719985, 2797360999, 1068828381, 1219638859, 3624741850,
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+ 2936675148, 906185462, 1090812512, 3747672003, 2825379669, 829329135,
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+ 1181335161, 3412177804, 3160834842, 628085408, 1382605366, 3423369109,
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+ 3138078467, 570562233, 1426400815, 3317316542, 2998733608, 733239954,
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+ 1555261956, 3268935591, 3050360625, 752459403, 1541320221, 2607071920,
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+ 3965973030, 1969922972, 40735498, 2617837225, 3943577151, 1913087877,
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+ 83908371, 2512341634, 3803740692, 2075208622, 213261112, 2463272603,
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+ 3855990285, 2094854071, 198958881, 2262029012, 4057260610, 1759359992,
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+ 534414190, 2176718541, 4139329115, 1873836001, 414664567, 2282248934,
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+ 4279200368, 1711684554, 285281116, 2405801727, 4167216745, 1634467795,
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+ 376229701, 2685067896, 3608007406, 1308918612, 956543938, 2808555105,
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+ 3495958263, 1231636301, 1047427035, 2932959818, 3654703836, 1088359270,
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+ 936918000, 2847714899, 3736837829, 1202900863, 817233897, 3183342108,
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+ 3401237130, 1404277552, 615818150, 3134207493, 3453421203, 1423857449,
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+ 601450431, 3009837614, 3294710456, 1567103746, 711928724, 3020668471,
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+ 3272380065, 1510334235, 755167117,
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+ ]
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+ o = -1
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+
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+ def right_without_sign(num: int, bit: int=0) -> int:
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+ val = ctypes.c_uint32(num).value >> bit
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+ MAX32INT = 4294967295
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+ return (val + (MAX32INT + 1)) % (2 * (MAX32INT + 1)) - MAX32INT - 1
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+
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+ for n in range(57):
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+ o = ie[(o & 255) ^ ord(e[n])] ^ right_without_sign(o, 8)
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+ return o ^ -1 ^ 3988292384
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+
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+
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+lookup = [
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+ "Z",
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+ "m",
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+ "s",
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+ "e",
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+ "r",
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+ "b",
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+ "B",
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+ "o",
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+ "H",
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+ "Q",
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+ "t",
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+ "N",
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+ "P",
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+ "+",
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+ "w",
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+ "O",
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+ "c",
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+ "z",
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+ "a",
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+ "/",
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+ "L",
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+ "p",
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+ "n",
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+ "g",
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+ "G",
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+ "8",
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+ "y",
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+ "J",
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+ "q",
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+ "4",
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+ "2",
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+ "K",
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+ "W",
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+ "Y",
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+ "j",
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+ "0",
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+ "D",
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+ "S",
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+ "f",
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+ "d",
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+ "i",
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+ "k",
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+ "x",
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+ "3",
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+ "V",
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+ "T",
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+ "1",
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+ "6",
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+ "I",
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+ "l",
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+ "U",
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+ "A",
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+ "F",
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+ "M",
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+ "9",
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+ "7",
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+ "h",
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+ "E",
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+ "C",
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+ "v",
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+ "u",
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+ "R",
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+ "X",
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+ "5",
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+]
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+
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+
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+def tripletToBase64(e):
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+ return (
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+ lookup[63 & (e >> 18)] +
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+ lookup[63 & (e >> 12)] +
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+ lookup[(e >> 6) & 63] +
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+ lookup[e & 63]
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+ )
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+
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+
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+def encodeChunk(e, t, r):
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+ m = []
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+ for b in range(t, r, 3):
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+ n = (16711680 & (e[b] << 16)) + \
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+ ((e[b + 1] << 8) & 65280) + (e[b + 2] & 255)
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+ m.append(tripletToBase64(n))
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+ return ''.join(m)
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+
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+
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+def b64Encode(e):
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+ P = len(e)
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+ W = P % 3
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+ U = []
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+ z = 16383
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+ H = 0
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+ Z = P - W
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+ while H < Z:
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+ U.append(encodeChunk(e, H, Z if H + z > Z else H + z))
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+ H += z
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+ if 1 == W:
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+ F = e[P - 1]
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+ U.append(lookup[F >> 2] + lookup[(F << 4) & 63] + "==")
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+ elif 2 == W:
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+ F = (e[P - 2] << 8) + e[P - 1]
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+ U.append(lookup[F >> 10] + lookup[63 & (F >> 4)] +
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+ lookup[(F << 2) & 63] + "=")
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+ return "".join(U)
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+
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+
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+def encodeUtf8(e):
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+ b = []
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+ m = urllib.parse.quote(e, safe='~()*!.\'')
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+ w = 0
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+ while w < len(m):
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+ T = m[w]
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+ if T == "%":
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+ E = m[w + 1] + m[w + 2]
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+ S = int(E, 16)
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+ b.append(S)
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+ w += 2
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+ else:
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+ b.append(ord(T[0]))
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+ w += 1
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+ return b
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+
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+
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+def base36encode(number, alphabet='0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
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+ """Converts an integer to a base36 string."""
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+ if not isinstance(number, int):
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+ raise TypeError('number must be an integer')
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+
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+ base36 = ''
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+ sign = ''
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+
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+ if number < 0:
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+ sign = '-'
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+ number = -number
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+
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+ if 0 <= number < len(alphabet):
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+ return sign + alphabet[number]
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+
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+ while number != 0:
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+ number, i = divmod(number, len(alphabet))
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+ base36 = alphabet[i] + base36
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+
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+ return sign + base36
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+
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+
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+def base36decode(number):
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+ return int(number, 36)
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+
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+
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+def get_search_id():
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+ e = int(time.time() * 1000) << 64
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+ t = int(random.uniform(0, 2147483646))
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+ return base36encode((e + t))
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+
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+
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+img_cdns = [
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+ "https://sns-img-qc.xhscdn.com",
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+ "https://sns-img-hw.xhscdn.com",
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+ "https://sns-img-bd.xhscdn.com",
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+ "https://sns-img-qn.xhscdn.com",
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+]
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+
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+def get_img_url_by_trace_id(trace_id: str, format_type: str = "png"):
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+ return f"{random.choice(img_cdns)}/{trace_id}?imageView2/format/{format_type}"
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+
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+
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+def get_img_urls_by_trace_id(trace_id: str, format_type: str = "png"):
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+ return [f"{cdn}/{trace_id}?imageView2/format/{format_type}" for cdn in img_cdns]
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+
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+
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+def get_trace_id(img_url: str):
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+ # 浏览器端上传的图片多了 /spectrum/ 这个路径
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+ return f"spectrum/{img_url.split('/')[-1]}" if img_url.find("spectrum") != -1 else img_url.split("/")[-1]
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+
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+
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+if __name__ == '__main__':
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+ _img_url = "https://sns-img-bd.xhscdn.com/7a3abfaf-90c1-a828-5de7-022c80b92aa3"
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+ # 获取一个图片地址在多个cdn下的url地址
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+ # final_img_urls = get_img_urls_by_trace_id(get_trace_id(_img_url))
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+ final_img_url = get_img_url_by_trace_id(get_trace_id(_img_url))
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+ print(final_img_url)
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+
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+
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