图片EXIF隐私清理与压缩（Strip/Resize/质量）最佳实践

背景与价值EXIF可能泄露位置与设备信息。统一清理与压缩策略可降低隐私风险并提升性能。统一规范清理EXIF：移除拍摄时间、定位与设备信息。尺寸限制：统一最大边长与最小边长。压缩质量：按场景设置质量范围（如 0.7-0.85）。核心实现类型识别与处理策略type Buf = ArrayBuffer function isJpeg(u: Uint8Array): boolean { return u[0]===0xFF && u[1]===0xD8 } function isPng(u: Uint8Array): boolean { return u[0]===0x89 && u[1]===0x50 && u[2]===0x4E && u[3]===0x47 } function detect(buf: Buf): 'image/jpeg' | 'image/png' | '' { const u = new Uint8Array(buf); if (isJpeg(u)) return 'image/jpeg'; if (isPng(u)) return 'image/png'; return '' } EXIF清理与压缩占位async function stripExif(buf: Buf, mime: string): Promise<Buf> { return buf } async function compress(buf: Buf, mime: string, quality = 0.8): Promise<Buf> { return buf } 尺寸限制占位function withinSize(width: number, height: number): boolean { const max = 4096; const min = 64; return width <= max && height <= max && width >= min && height >= min } 流程组合type Img = { data: Buf; mime: string; width: number; height: number } async function process(img: Img): Promise<Buf | null> { if (!withinSize(img.width, img.height)) return null const t = detect(img.data) if (t !== img.mime || t === '') return null const noExif = await stripExif(img.data, img.mime) const out = await compress(noExif, img.mime, 0.8) return out } 落地建议-在上传与处理阶段统一清理EXIF并按质量范围压缩，确保隐私与性能。设置尺寸上下限与类型识别，拒绝超限或不匹配文件。验证清单EXIF是否清理；尺寸与质量是否在策略范围内；类型识别是否一致。