1.4.5.2

EdgeNode/internal/nodes/http_request_utils.go

@@ -0,0 +1,241 @@
+package nodes
+
+import (
+	"crypto/rand"
+	"fmt"
+	teaconst "github.com/TeaOSLab/EdgeNode/internal/const"
+	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
+	"github.com/TeaOSLab/EdgeNode/internal/utils/ranges"
+	"github.com/iwind/TeaGo/types"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync/atomic"
+)
+
+// 搜索引擎和爬虫正则
+var searchEngineRegex = regexp.MustCompile(`(?i)(60spider|adldxbot|adsbot-google|applebot|admantx|alexa|baidu|bingbot|bingpreview|facebookexternalhit|googlebot|proximic|slurp|sogou|twitterbot|yandex)`)
+var spiderRegexp = regexp.MustCompile(`(?i)(python|pycurl|http-client|httpclient|apachebench|nethttp|http_request|java|perl|ruby|scrapy|php|rust)`)
+
+// 内容范围正则，其中的每个括号里的内容都在被引用，不能轻易修改
+var contentRangeRegexp = regexp.MustCompile(`^bytes (\d+)-(\d+)/(\d+|\*)`)
+
+// URL协议前缀
+var urlSchemeRegexp = regexp.MustCompile("^(?i)(http|https|ftp)://")
+
+// 分解Range
+func httpRequestParseRangeHeader(rangeValue string) (result []rangeutils.Range, ok bool) {
+	// 参考RFC：https://tools.ietf.org/html/rfc7233
+	index := strings.Index(rangeValue, "=")
+	if index == -1 {
+		return
+	}
+	unit := rangeValue[:index]
+	if unit != "bytes" {
+		return
+	}
+
+	var rangeSetString = rangeValue[index+1:]
+	if len(rangeSetString) == 0 {
+		ok = true
+		return
+	}
+
+	var pieces = strings.Split(rangeSetString, ", ")
+	for _, piece := range pieces {
+		index = strings.Index(piece, "-")
+		if index == -1 {
+			return
+		}
+		first := piece[:index]
+		firstInt := int64(-1)
+
+		var err error
+		last := piece[index+1:]
+		var lastInt = int64(-1)
+
+		if len(first) > 0 {
+			firstInt, err = strconv.ParseInt(first, 10, 64)
+			if err != nil {
+				return
+			}
+
+			if len(last) > 0 {
+				lastInt, err = strconv.ParseInt(last, 10, 64)
+				if err != nil {
+					return
+				}
+				if lastInt < firstInt {
+					return
+				}
+			}
+		} else {
+			if len(last) == 0 {
+				return
+			}
+
+			lastInt, err = strconv.ParseInt(last, 10, 64)
+			if err != nil {
+				return
+			}
+			lastInt = -lastInt
+		}
+
+		result = append(result, [2]int64{firstInt, lastInt})
+	}
+
+	ok = true
+	return
+}
+
+// 读取内容Range
+func httpRequestReadRange(reader io.Reader, buf []byte, start int64, end int64, callback func(buf []byte, n int) error) (ok bool, err error) {
+	if start < 0 || end < 0 {
+		return
+	}
+	seeker, ok := reader.(io.Seeker)
+	if !ok {
+		return
+	}
+	_, err = seeker.Seek(start, io.SeekStart)
+	if err != nil {
+		return false, nil
+	}
+
+	offset := start
+	for {
+		n, err := reader.Read(buf)
+		if n > 0 {
+			offset += int64(n)
+			if end < offset {
+				err = callback(buf, n-int(offset-end-1))
+				if err != nil {
+					return false, err
+				}
+				return true, nil
+			} else {
+				err = callback(buf, n)
+				if err != nil {
+					return false, err
+				}
+			}
+		}
+
+		if err != nil {
+			if err == io.EOF {
+				return true, nil
+			}
+			return false, err
+		}
+	}
+}
+
+// 分解Content-Range
+func httpRequestParseContentRangeHeader(contentRange string) (start int64, total int64) {
+	var matches = contentRangeRegexp.FindStringSubmatch(contentRange)
+	if len(matches) < 4 {
+		return -1, -1
+	}
+
+	start = types.Int64(matches[1])
+	var sizeString = matches[3]
+	if sizeString != "*" {
+		total = types.Int64(sizeString)
+	}
+	return
+}
+
+// 生成boundary
+// 仿照Golang自带的函数（multipart包）
+func httpRequestGenBoundary() string {
+	var buf [8]byte
+	_, err := io.ReadFull(rand.Reader, buf[:])
+	if err != nil {
+		panic(err)
+	}
+	return fmt.Sprintf("%x", buf[:])
+}
+
+// 从content-type中读取boundary
+func httpRequestParseBoundary(contentType string) string {
+	var delim = "boundary="
+	var boundaryIndex = strings.Index(contentType, delim)
+	if boundaryIndex < 0 {
+		return ""
+	}
+	var boundary = contentType[boundaryIndex+len(delim):]
+	semicolonIndex := strings.Index(boundary, ";")
+	if semicolonIndex >= 0 {
+		return boundary[:semicolonIndex]
+	}
+	return boundary
+}
+
+// 判断状态是否为跳转
+func httpStatusIsRedirect(statusCode int) bool {
+	return statusCode == http.StatusPermanentRedirect ||
+		statusCode == http.StatusTemporaryRedirect ||
+		statusCode == http.StatusMovedPermanently ||
+		statusCode == http.StatusSeeOther ||
+		statusCode == http.StatusFound
+}
+
+// 生成请求ID
+var httpRequestTimestamp int64
+var httpRequestId int32 = 1_000_000
+
+func httpRequestNextId() string {
+	unixTime, unixTimeString := fasttime.Now().UnixMilliString()
+	if unixTime > httpRequestTimestamp {
+		atomic.StoreInt32(&httpRequestId, 1_000_000)
+		httpRequestTimestamp = unixTime
+	}
+
+	// timestamp + nodeId + requestId
+	return unixTimeString + teaconst.NodeIdString + strconv.Itoa(int(atomic.AddInt32(&httpRequestId, 1)))
+}
+
+// 检查是否可以接受某个编码
+func httpAcceptEncoding(acceptEncodings string, encoding string) bool {
+	if len(acceptEncodings) == 0 {
+		return false
+	}
+	var pieces = strings.Split(acceptEncodings, ",")
+	for _, piece := range pieces {
+		var qualityIndex = strings.Index(piece, ";")
+		if qualityIndex >= 0 {
+			piece = piece[:qualityIndex]
+		}
+
+		if strings.TrimSpace(piece) == encoding {
+			return true
+		}
+	}
+	return false
+}
+
+// 跳转到某个URL
+func httpRedirect(writer http.ResponseWriter, req *http.Request, url string, code int) {
+	if len(writer.Header().Get("Content-Type")) == 0 {
+		// 设置Content-Type，是为了让页面不输出链接
+		writer.Header().Set("Content-Type", "text/html; charset=utf-8")
+	}
+
+	http.Redirect(writer, req, url, code)
+}
+
+// 分析URL中的Host部分
+func httpParseHost(urlString string) (host string, err error) {
+	if !urlSchemeRegexp.MatchString(urlString) {
+		urlString = "https://" + urlString
+	}
+
+	u, err := url.Parse(urlString)
+	if err != nil && u != nil {
+		return "", err
+	}
+	return u.Host, nil
+}