mirror of
https://github.com/truewhile/MeBox.git
synced 2026-10-03 04:26:36 +08:00
truewhile
121 lines
4.5 KiB
Go
121 lines
4.5 KiB
Go
// Package helper provides shared HTTP client utilities
|
||
// with browser-like headers and Cloudflare/WAF bypass support.
|
||
package helper
|
||
|
||
import (
|
||
"bytes"
|
||
"compress/flate"
|
||
"compress/gzip"
|
||
"compress/zlib"
|
||
"io"
|
||
"net/http"
|
||
"net/url"
|
||
"strings"
|
||
"time"
|
||
)
|
||
|
||
// defaultUserAgent 是默认浏览器 User-Agent（用于 HTTP 请求头）。
|
||
const defaultUserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
|
||
|
||
// DecompressBody 兜底解压响应体（gzip / deflate）。
|
||
//
|
||
// 正常情况下用不到：只要不显式设置 Accept-Encoding，net/http 会自己带上 gzip
|
||
// 并透明解压。但书源 JSON 的 header 字段、或某些 CDN 的固定策略，都可能让响应
|
||
// 带着 Content-Encoding 回来，压缩字节一旦进入规则层，书源的 JSON.parse 就会
|
||
// 报 `invalid character '\x1f'`。这里做一次兜底，保证调用方拿到明文。
|
||
//
|
||
// brotli（br）无法在纯 Go 标准库里解，因此上面不再 advertise br；真遇到 br
|
||
// 响应则原样返回，由调用方按失败处理。
|
||
func DecompressBody(resp *http.Response, data []byte) []byte {
|
||
if resp == nil || len(data) == 0 {
|
||
return data
|
||
}
|
||
switch strings.ToLower(strings.TrimSpace(resp.Header.Get("Content-Encoding"))) {
|
||
case "gzip", "x-gzip":
|
||
r, err := gzip.NewReader(bytes.NewReader(data))
|
||
if err != nil {
|
||
return data
|
||
}
|
||
defer r.Close()
|
||
if out, err := io.ReadAll(r); err == nil {
|
||
return out
|
||
}
|
||
case "deflate":
|
||
// deflate 有两种实际写法：zlib 包装与裸 DEFLATE，依次尝试。
|
||
if out, err := io.ReadAll(flate.NewReader(bytes.NewReader(data))); err == nil {
|
||
return out
|
||
}
|
||
if zr, err := zlib.NewReader(bytes.NewReader(data)); err == nil {
|
||
defer zr.Close()
|
||
if out, err := io.ReadAll(zr); err == nil {
|
||
return out
|
||
}
|
||
}
|
||
}
|
||
return data
|
||
}
|
||
|
||
// StripAcceptEncoding 移除显式设置的 Accept-Encoding，交回 net/http 管理。
|
||
//
|
||
// 只有「调用方没设置」时 net/http 才会自动解压，因此任何来源（预设头、书源
|
||
// header 字段）带来的 Accept-Encoding 都必须清掉。
|
||
func StripAcceptEncoding(h http.Header) {
|
||
h.Del("Accept-Encoding")
|
||
}
|
||
|
||
// NewSiteHTTPClient builds an http.Client honoring per-site policies:
|
||
// - timeout (seconds, defaults to 15)
|
||
// - proxy via HTTP(S)_PROXY environment variables when site.UseProxy is on
|
||
//
|
||
// When useProxy is false, the client is created without proxy plumbing so
|
||
// the request goes out direct, matching the user's checkbox intent.
|
||
func NewSiteHTTPClient(timeoutSeconds int, useProxy bool) *http.Client {
|
||
if timeoutSeconds <= 0 {
|
||
timeoutSeconds = 15
|
||
}
|
||
tr := &http.Transport{
|
||
MaxIdleConns: 16,
|
||
MaxIdleConnsPerHost: 4,
|
||
IdleConnTimeout: 60 * time.Second,
|
||
TLSHandshakeTimeout: 15 * time.Second,
|
||
ExpectContinueTimeout: 1 * time.Second,
|
||
}
|
||
if useProxy {
|
||
tr.Proxy = func(r *http.Request) (*url.URL, error) {
|
||
return ProxyFromEnvironmentOrSystem(r)
|
||
}
|
||
}
|
||
return &http.Client{
|
||
Timeout: time.Duration(timeoutSeconds) * time.Second,
|
||
Transport: tr,
|
||
}
|
||
}
|
||
|
||
// HTTPHeaderPresets returns a map of realistic browser HTTP headers.
|
||
// These mimic a real Chrome browser to avoid WAF/bot detection.
|
||
//
|
||
// 注意：这里刻意不设置 Accept-Encoding。
|
||
//
|
||
// net/http 只在「调用方没有显式设置 Accept-Encoding」时才会自己补上 gzip 并
|
||
// 透明解压；一旦我们显式写了这个头，它就原样把压缩字节交出来。之前这里写了
|
||
// "gzip, deflate, br"，于是所有经历了压缩的响应（静态 JSON、CDN 上的页面等）
|
||
// 都会以原始压缩字节进入规则层，书源的 JSON.parse 直接报
|
||
// `SyntaxError: invalid character '\x1f'`，表现为「获取最新配置失败」。
|
||
//
|
||
// 交给 net/http 管理后：请求仍会带 `Accept-Encoding: gzip`（浏览器常见取值），
|
||
// 且响应被自动解压；另外也避免服务端挑选我们无法解码的 br。
|
||
func HTTPHeaderPresets() map[string]string {
|
||
return map[string]string{
|
||
"User-Agent": defaultUserAgent,
|
||
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
|
||
"Accept-Language": "zh-CN,zh;q=0.9,en;q=0.8",
|
||
"Connection": "keep-alive",
|
||
"Upgrade-Insecure-Requests": "1",
|
||
"Sec-Fetch-Dest": "document",
|
||
"Sec-Fetch-Mode": "navigate",
|
||
"Sec-Fetch-Site": "none",
|
||
"Sec-Fetch-User": "?1",
|
||
"Cache-Control": "max-age=0",
|
||
}
|
||
}
|