wehub-resource-sync
05fcd08057
Deploy GitBook to 9router.github.io / build-deploy (push) Failing after 2s
56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
/**
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* Qoder body encoding ported from qoder2api's QoderEncoding.java (via the
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* CLIProxyAPIPlus qoder-provider branch).
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*
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* Algorithm:
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* 1. base64-encode the plaintext bytes (standard alphabet).
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* 2. Rearrange: split into thirds, reorder as [tail][mid][head].
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* 3. Substitute each character via a custom alphabet mapping.
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*
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* The encoded body must be sent with `&Encode=1` appended to the URL so the
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* server decodes in reverse. The obfuscation prevents Alibaba Cloud WAF from
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* pattern-matching the plaintext request body.
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*/
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const QODER_STD_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const QODER_CUSTOM_ALPHABET = "_doRTgHZBKcGVjlvpC,@aFSx#DPuNJme&i*MzLOEn)sUrthbf%Y^w.(kIQyXqWA!";
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const QODER_S2C = (() => {
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const table = new Int16Array(128).fill(-1);
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for (let i = 0; i < 64; i++) {
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table[QODER_STD_ALPHABET.charCodeAt(i)] = QODER_CUSTOM_ALPHABET.charCodeAt(i);
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}
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table["=".charCodeAt(0)] = "$".charCodeAt(0);
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return table;
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})();
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/**
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* Encode plaintext bytes/string using Qoder's WAF-bypass scheme.
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* @param {Buffer|Uint8Array|string} plaintext
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* @returns {string} encoded string
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*/
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export function qoderEncodeBody(plaintext) {
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const buf = Buffer.isBuffer(plaintext)
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? plaintext
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: typeof plaintext === "string"
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? Buffer.from(plaintext, "utf8")
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: Buffer.from(plaintext);
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const std = buf.toString("base64");
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const n = std.length;
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const a = Math.floor(n / 3);
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// [tail][mid][head]
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const rearranged = std.slice(n - a) + std.slice(a, n - a) + std.slice(0, a);
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const out = Buffer.alloc(n);
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for (let i = 0; i < n; i++) {
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const c = rearranged.charCodeAt(i);
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if (c < 128 && QODER_S2C[c] >= 0) {
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out[i] = QODER_S2C[c];
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} else {
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out[i] = c;
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}
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}
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return out.toString("latin1");
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}
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