27 lines
749 B
Go
27 lines
749 B
Go
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package pdfvalidate
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import (
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"bytes"
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"errors"
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"fmt"
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)
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// MaxAuthorizePDFBytes 授权类 PDF 大小上限（与汇博等对接约定一致）
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const MaxAuthorizePDFBytes = 500 * 1024
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var pdfMagic = []byte("%PDF-")
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// ValidateDecodedPDFBinary 仅校验已通过 Base64 解码得到的原始字节：非空、长度、PDF 魔数头部。
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func ValidateDecodedPDFBinary(raw []byte) error {
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if len(raw) == 0 {
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return errors.New("授权书文件不能为空")
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}
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if len(raw) > MaxAuthorizePDFBytes {
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return fmt.Errorf("授权书文件不能超过500KB，当前大小: %d字节", len(raw))
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}
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if len(raw) < len(pdfMagic) || !bytes.Equal(raw[:len(pdfMagic)], pdfMagic) {
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return errors.New("授权书文件必须为PDF格式")
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}
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return nil
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}
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