mirror of
https://github.com/farion1231/cc-switch.git
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Thefool
c49cf96a16
* fix(grokbuild): complete proxy integration * fix(deeplink): preview GrokBuild configs safely * test(app): stabilize provider integration suite * fix(grokbuild): address review feedback * fix(grokbuild): resolve remaining review findings * fix(grokbuild): use native sessions and harden previews
67 lines
2.6 KiB
TypeScript
67 lines
2.6 KiB
TypeScript
/**
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* 把 URL-safe Base64（RFC 4648 §5）归一到 `atob` 认识的标准字母表，
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* 并还原被 URL 解析吃掉的 `+`（会变成空格）。
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*
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* 标准 Base64 的字母表里不存在 `-` 与 `_`，因此这两条替换不会误伤标准输入。
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*
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* ⚠️ 这里必须与后端 `deeplink/utils.rs::decode_base64_param` 的语义保持一致。
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* 后端依次尝试 STANDARD / STANDARD_NO_PAD / URL_SAFE / URL_SAFE_NO_PAD 四种引擎；
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* 前端若只认标准字母表，同一条链接就会出现「确认框显示不透明 Base64 或空列表、
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* 后端却解码并保存了真实内容」的错位——即用户在看不见 payload 的情况下点了确认。
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*/
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function toStandardBase64Alphabet(value: string): string {
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return value.replace(/ /g, "+").replace(/-/g, "+").replace(/_/g, "/");
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}
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function trimOuterLineBreaks(value: string): string {
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return value.replace(/^[\r\n]+|[\r\n]+$/g, "");
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}
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/**
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* Decode Base64 encoded UTF-8 string
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*
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* This function handles various Base64 edge cases that can occur when
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* Base64 strings are passed through URLs:
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* - Spaces (URL parsing may convert '+' to space)
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* - Missing padding ('=' characters)
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* - Standard and URL-safe alphabets (RFC 4648 §4 and §5)
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*
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* @param str - Base64 encoded string
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* @returns Decoded UTF-8 string
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*/
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export function decodeBase64Utf8(str: string): string {
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try {
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// Keep spaces intact until they are restored to `+`. Using `trim()` here
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// would discard a URL-decoded `+` at either edge and diverge from the
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// backend decoder, which trims only CR/LF characters.
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let cleaned = toStandardBase64Alphabet(trimOuterLineBreaks(str));
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// Try to decode with standard Base64 first
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try {
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const binString = atob(cleaned);
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const bytes = Uint8Array.from(binString, (m) => m.codePointAt(0)!);
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return new TextDecoder("utf-8", { fatal: false }).decode(bytes);
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} catch (e1) {
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// If standard fails, try adding padding
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const remainder = cleaned.length % 4;
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if (remainder !== 0) {
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cleaned += "=".repeat(4 - remainder);
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}
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const binString = atob(cleaned);
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const bytes = Uint8Array.from(binString, (m) => m.codePointAt(0)!);
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return new TextDecoder("utf-8", { fatal: false }).decode(bytes);
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}
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} catch (e) {
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console.error("Base64 decode error:", e, "Input:", str);
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// Last resort fallback using deprecated but sometimes working method
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try {
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return decodeURIComponent(
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escape(atob(toStandardBase64Alphabet(trimOuterLineBreaks(str)))),
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);
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} catch {
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// If all else fails, return original string
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return str;
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}
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}
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}
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