dual check v0.1
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// Package sessionid 提供高熵 session ID 生成器
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package sessionid
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import (
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"crypto/rand"
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"encoding/base64"
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)
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// Generate 生成 128-bit 随机 session ID
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// 输出为 base64url (无 padding) 编码,共 22 字符
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// 熵值 2^128 ≈ 3.4e38,暴力枚举不可行
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func Generate() (string, error) {
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b := make([]byte, 16)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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