mirror of
https://github.com/alibaba/higress.git
synced 2026-02-26 13:40:49 +08:00
412 lines
12 KiB
Go
412 lines
12 KiB
Go
package util
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import (
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"encoding/json"
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"hash/crc32"
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"net/url"
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"path"
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"path/filepath"
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"sort"
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"strings"
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"github.com/bmatcuk/doublestar/v4"
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"github.com/google/uuid"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/alibaba/higress/plugins/wasm-go/extensions/frontend-gray/config"
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"github.com/tidwall/gjson"
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)
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func GetRequestPath() string {
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requestPath, _ := proxywasm.GetHttpRequestHeader(":path")
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requestPath = path.Clean(requestPath)
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parsedURL, err := url.Parse(requestPath)
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if err == nil {
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requestPath = parsedURL.Path
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} else {
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return ""
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}
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return requestPath
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}
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func GetRouteName() (string, error) {
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if raw, err := proxywasm.GetProperty([]string{"route_name"}); err != nil {
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return "-", err
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} else {
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return string(raw), nil
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}
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}
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func IsRequestSkippedByHeaders(grayConfig *config.GrayConfig) bool {
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for headerKey, headerValue := range grayConfig.SkippedByHeaders {
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requestHeader, _ := proxywasm.GetHttpRequestHeader(headerKey)
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if requestHeader == headerValue {
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return true
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}
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}
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return false
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}
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func IsIndexRequest(requestPath string, indexPaths []string) bool {
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for _, prefix := range indexPaths {
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matchResult, err := doublestar.Match(prefix, requestPath)
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if err == nil && matchResult {
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return true
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}
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}
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return false
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}
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func IsGrayEnabled(requestPath string, grayConfig *config.GrayConfig) bool {
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if IsIndexRequest(requestPath, grayConfig.IndexPaths) {
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return true
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}
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// 当前路径中前缀为 SkippedPaths，则不走插件逻辑
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for _, prefix := range grayConfig.SkippedPaths {
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matchResult, err := doublestar.Match(prefix, requestPath)
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if err == nil && matchResult {
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return false
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}
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}
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// 如果是首页，进入插件逻辑
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if CheckIsHtmlRequest(requestPath) {
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return true
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}
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// 检查是否存在重写主机
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if grayConfig.Rewrite != nil && grayConfig.Rewrite.Host != "" {
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return true
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}
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// 检查header标识，判断是否需要跳过
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if IsRequestSkippedByHeaders(grayConfig) {
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return false
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}
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// 检查是否存在灰度版本配置
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return len(grayConfig.GrayDeployments) > 0
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}
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// 是否启用后端的灰度（全链路灰度）
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func IsBackendGrayEnabled(grayConfig config.GrayConfig) bool {
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for _, deployment := range grayConfig.GrayDeployments {
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if deployment.BackendVersion != "" {
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return true
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}
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}
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return false
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}
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// GetCookieValue 根据 cookie 和 key 获取 cookie 值
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func GetCookieValue(cookie string, key string) string {
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if cookie == "" {
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return ""
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}
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value := ""
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pairs := strings.Split(cookie, ";")
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for _, pair := range pairs {
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pair = strings.TrimSpace(pair)
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kv := strings.Split(pair, "=")
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if kv[0] == key {
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value = kv[1]
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break
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}
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}
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return value
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}
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func ContainsValue(slice []string, value string) bool {
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for _, item := range slice {
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if item == value {
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return true
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}
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}
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return false
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}
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// headers: [][2]string -> map[string][]string
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func ConvertHeaders(hs [][2]string) map[string][]string {
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ret := make(map[string][]string)
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for _, h := range hs {
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k, v := strings.ToLower(h[0]), h[1]
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ret[k] = append(ret[k], v)
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}
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return ret
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}
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// headers: map[string][]string -> [][2]string
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func ReconvertHeaders(hs map[string][]string) [][2]string {
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var ret [][2]string
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for k, vs := range hs {
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for _, v := range vs {
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ret = append(ret, [2]string{k, v})
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}
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}
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sort.SliceStable(ret, func(i, j int) bool {
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return ret[i][0] < ret[j][0]
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})
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return ret
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}
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func GetRule(rules []*config.GrayRule, name string) *config.GrayRule {
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for _, rule := range rules {
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if rule.Name == name {
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return rule
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}
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}
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return nil
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}
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// 检查是否是页面
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var indexSuffixes = []string{
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".html", ".htm", ".jsp", ".php", ".asp", ".aspx", ".erb", ".ejs", ".twig",
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}
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func CheckIsHtmlRequest(requestPath string) bool {
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if requestPath == "/" || requestPath == "" {
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return true
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}
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ext := path.Ext(requestPath)
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return ext == "" || ContainsValue(indexSuffixes, ext)
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}
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// SortKeysByLengthAndLexicographically 按长度降序和字典序排序键
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func SortKeysByLengthAndLexicographically(matchRules map[string]string) []string {
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keys := make([]string, 0, len(matchRules))
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for prefix := range matchRules {
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keys = append(keys, prefix)
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}
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sort.Slice(keys, func(i, j int) bool {
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if len(keys[i]) != len(keys[j]) {
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return len(keys[i]) > len(keys[j]) // 按长度排序
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}
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return keys[i] < keys[j] // 按字典序排序
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})
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return keys
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}
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// 首页Rewrite
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func IndexRewrite(path, version string, matchRules map[string]string) string {
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// 使用新的排序函数
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keys := SortKeysByLengthAndLexicographically(matchRules)
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// 遍历排序后的键以找到最长匹配
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for _, prefix := range keys {
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if strings.HasPrefix(path, prefix) {
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rewrite := matchRules[prefix]
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newPath := strings.Replace(rewrite, "{version}", version, -1)
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return newPath
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}
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}
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return path
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}
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func PrefixFileRewrite(path, version string, matchRules map[string]string) string {
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// 对规则的键进行排序
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sortedKeys := SortKeysByLengthAndLexicographically(matchRules)
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// 遍历排序后的键
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for _, prefix := range sortedKeys {
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if strings.HasPrefix(path, prefix) {
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// 找到第一个匹配的前缀就停止,因为它是最长的匹配
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replacement := strings.Replace(matchRules[prefix], "{version}", version, 1)
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newPath := strings.Replace(path, prefix, replacement+"/", 1)
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return filepath.Clean(newPath)
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}
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}
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// 如果没有匹配,返回原始路径
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return path
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}
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func GetVersion(grayConfig config.GrayConfig, deployment *config.Deployment, xPreHigressVersion string) *config.Deployment {
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// cookie 中为空，返回当前版本
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if xPreHigressVersion == "" {
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return deployment
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}
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// cookie 中和当前版本不相同，返回cookie中值
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if xPreHigressVersion != deployment.Version {
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deployments := append(grayConfig.GrayDeployments, grayConfig.BaseDeployment)
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for _, curDeployment := range deployments {
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if curDeployment.Version == xPreHigressVersion {
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return curDeployment
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}
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}
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}
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return deployment
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}
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// 从cookie中解析出灰度信息
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func getBySubKey(grayInfoStr string, graySubKey string) string {
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// 首先对 URL 编码的字符串进行解码
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jsonStr, err := url.QueryUnescape(grayInfoStr)
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if err != nil {
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return ""
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}
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// 使用 gjson 从 JSON 字符串中提取 graySubKey 对应的值
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value := gjson.Get(jsonStr, graySubKey)
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// 检查所提取的值是否存在
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if !value.Exists() {
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return ""
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}
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// 返回字符串形式的值
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return value.String()
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}
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func GetGrayKey(grayKeyValueByCookie string, grayKeyValueByHeader string, graySubKey string) string {
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grayKeyValue := grayKeyValueByCookie
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if grayKeyValueByCookie == "" {
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grayKeyValue = grayKeyValueByHeader
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}
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// 如果有子key, 尝试从子key中获取值
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if graySubKey != "" {
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subKeyValue := getBySubKey(grayKeyValue, graySubKey)
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if subKeyValue != "" {
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grayKeyValue = subKeyValue
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}
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}
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return grayKeyValue
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}
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// 如果基础部署或任何灰度部署中包含VersionPredicates，则认为是多版本配置
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func IsSupportMultiVersion(grayConfig config.GrayConfig) bool {
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if len(grayConfig.BaseDeployment.VersionPredicates) > 0 {
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return true
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}
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for _, deployment := range grayConfig.GrayDeployments {
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if len(deployment.VersionPredicates) > 0 {
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return true
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}
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}
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return false
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}
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func GetConditionRules(rules []*config.GrayRule, grayKeyValue string, cookie string) string {
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ruleMaps := map[string]bool{}
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for _, grayRule := range rules {
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if grayRule.GrayKeyValue != nil && len(grayRule.GrayKeyValue) > 0 && grayKeyValue != "" {
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ruleMaps[grayRule.Name] = ContainsValue(grayRule.GrayKeyValue, grayKeyValue)
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continue
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} else if grayRule.GrayTagKey != "" && grayRule.GrayTagValue != nil && len(grayRule.GrayTagValue) > 0 {
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grayTagValue := GetCookieValue(cookie, grayRule.GrayTagKey)
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ruleMaps[grayRule.Name] = ContainsValue(grayRule.GrayTagValue, grayTagValue)
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continue
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} else {
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ruleMaps[grayRule.Name] = false
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}
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}
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jsonBytes, err := json.Marshal(ruleMaps)
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if err != nil {
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return ""
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}
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return string(jsonBytes)
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}
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func GetGrayWeightUniqueId(cookie string, uniqueGrayTag string) string {
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uniqueId := GetCookieValue(cookie, uniqueGrayTag)
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if uniqueId == "" {
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uniqueId = strings.ReplaceAll(uuid.NewString(), "-", "")
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}
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return uniqueId
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}
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// FilterGrayRule 过滤灰度规则
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func FilterGrayRule(grayConfig *config.GrayConfig, grayKeyValue string, cookie string) *config.Deployment {
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if grayConfig.GrayWeight > 0 {
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uniqueId := GetGrayWeightUniqueId(cookie, grayConfig.UniqueGrayTag)
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// 计算哈希后取模
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mod := crc32.ChecksumIEEE([]byte(uniqueId)) % 100
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isGray := mod < uint32(grayConfig.GrayWeight)
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if isGray {
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for _, deployment := range grayConfig.GrayDeployments {
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if deployment.Enabled && deployment.Weight > 0 {
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return deployment
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}
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}
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}
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return grayConfig.BaseDeployment
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}
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for _, deployment := range grayConfig.GrayDeployments {
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grayRule := GetRule(grayConfig.Rules, deployment.Name)
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// 首先：先校验用户名单ID
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if grayRule.GrayKeyValue != nil && len(grayRule.GrayKeyValue) > 0 && grayKeyValue != "" {
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if ContainsValue(grayRule.GrayKeyValue, grayKeyValue) {
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return deployment
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}
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}
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// 第二：校验Cookie中的 GrayTagKey
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if grayRule.GrayTagKey != "" && grayRule.GrayTagValue != nil && len(grayRule.GrayTagValue) > 0 {
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grayTagValue := GetCookieValue(cookie, grayRule.GrayTagKey)
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if ContainsValue(grayRule.GrayTagValue, grayTagValue) {
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return deployment
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}
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}
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}
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return grayConfig.BaseDeployment
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}
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// FilterMultiVersionGrayRule 过滤多版本灰度规则
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func FilterMultiVersionGrayRule(grayConfig *config.GrayConfig, grayKeyValue string, cookie string, requestPath string) *config.Deployment {
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// 首先根据灰度键值获取当前部署
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currentDeployment := FilterGrayRule(grayConfig, grayKeyValue, cookie)
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// 创建一个新的部署对象，初始化版本为当前部署的版本
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deployment := &config.Deployment{
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Version: currentDeployment.Version,
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}
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// 对版本谓词的键进行排序
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keys := SortKeysByLengthAndLexicographically(currentDeployment.VersionPredicates)
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// 遍历排序后的键
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for _, prefix := range keys {
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// 如果请求路径以当前前缀开头
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if strings.HasPrefix(requestPath, prefix) {
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deployment.Version = currentDeployment.VersionPredicates[prefix]
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return deployment
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}
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}
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return deployment
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}
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// InjectContent 用于将内容注入到 HTML 文档的指定位置
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func InjectContent(originalHtml string, injectionConfig *config.Injection, globalConfigValue string) string {
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heads := injectionConfig.Head
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if globalConfigValue != "" {
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heads = append([]string{globalConfigValue}, injectionConfig.Head...)
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}
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headInjection := strings.Join(heads, "\n")
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bodyFirstInjection := strings.Join(injectionConfig.Body.First, "\n")
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bodyLastInjection := strings.Join(injectionConfig.Body.Last, "\n")
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// 使用 strings.Builder 来提高性能
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var sb strings.Builder
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// 预分配内存，避免多次内存分配
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sb.Grow(len(originalHtml) + len(headInjection) + len(bodyFirstInjection) + len(bodyLastInjection))
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sb.WriteString(originalHtml)
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modifiedHtml := sb.String()
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// 注入到头部
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "</head>", headInjection+"\n</head>")
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// 注入到body头
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "<body>", "<body>\n"+bodyFirstInjection)
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// 注入到body尾
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modifiedHtml = strings.ReplaceAll(modifiedHtml, "</body>", bodyLastInjection+"\n</body>")
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return modifiedHtml
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}
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func FixLocalStorageKey(newHtml string, localStorageGrayKey string) string {
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if localStorageGrayKey != "" {
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localStr := strings.ReplaceAll(`<script>
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!function(){var o,e,n="@@X_GRAY_KEY",t=document.cookie.split("; ").filter(function(o){return 0===o.indexOf(n+"=")});try{"undefined"!=typeof localStorage&&null!==localStorage&&(o=localStorage.getItem(n),e=0<t.length?decodeURIComponent(t[0].split("=")[1]):null,o)&&o.indexOf("=")<0&&e&&e!==o&&(document.cookie=n+"="+encodeURIComponent(o)+"; path=/;",window.location.reload())}catch(o){}}();
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</script>
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`, "@@X_GRAY_KEY", localStorageGrayKey)
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newHtml = strings.ReplaceAll(newHtml, "<body>", "<body>\n"+localStr)
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}
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return newHtml
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}
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