feat: 🎸 frontend-gray plugin support cdn type deploy (#1178)

Co-authored-by: Kent Dong <ch3cho@qq.com>

plugins/wasm-go/extensions/frontend-gray/util/utils.go

@@ -2,39 +2,56 @@ package util
 
 import (
 	"net/url"
+	"path"
+	"path/filepath"
+	"sort"
 	"strings"
 
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
+
 	"github.com/alibaba/higress/plugins/wasm-go/extensions/frontend-gray/config"
 
 	"github.com/tidwall/gjson"
 )
 
-// GetValueByCookie 根据 cookieStr 和 cookieName 获取 cookie 值
-func GetValueByCookie(cookieStr string, cookieName string) string {
-	if cookieStr == "" {
+func IsGrayEnabled(grayConfig config.GrayConfig) bool {
+	// 检查是否存在重写主机
+	if grayConfig.Rewrite != nil && grayConfig.Rewrite.Host != "" {
+		return true
+	}
+
+	// 检查灰度部署是否为 nil 或空
+	grayDeployments := grayConfig.GrayDeployments
+	if grayDeployments != nil && len(grayDeployments) > 0 {
+		for _, grayDeployment := range grayDeployments {
+			if grayDeployment.Enabled {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+// ExtractCookieValueByKey 根据 cookie 和 key 获取 cookie 值
+func ExtractCookieValueByKey(cookie string, key string) string {
+	if cookie == "" {
 		return ""
 	}
-	cookies := strings.Split(cookieStr, ";")
-	curCookieName := cookieName + "="
-	var foundCookieValue string
-	var found bool
-	// 遍历找到 cookie 对并处理
-	for _, cookie := range cookies {
-		cookie = strings.TrimSpace(cookie) // 清理空白符
-		if strings.HasPrefix(cookie, curCookieName) {
-			foundCookieValue = cookie[len(curCookieName):]
-			found = true
+	value := ""
+	pairs := strings.Split(cookie, ";")
+	for _, pair := range pairs {
+		pair = strings.TrimSpace(pair)
+		kv := strings.Split(pair, "=")
+		if kv[0] == key {
+			value = kv[1]
 			break
 		}
 	}
-	if !found {
-		return ""
-	}
-	return foundCookieValue
+	return value
 }
 
-// contains 检查切片 slice 中是否含有元素 value。
-func Contains(slice []interface{}, value string) bool {
+func ContainsValue(slice []string, value string) bool {
 	for _, item := range slice {
 		if item == value {
 			return true
@@ -43,6 +60,30 @@ func Contains(slice []interface{}, value string) bool {
 	return false
 }
 
+// headers: [][2]string -> map[string][]string
+func ConvertHeaders(hs [][2]string) map[string][]string {
+	ret := make(map[string][]string)
+	for _, h := range hs {
+		k, v := strings.ToLower(h[0]), h[1]
+		ret[k] = append(ret[k], v)
+	}
+	return ret
+}
+
+// headers: map[string][]string -> [][2]string
+func ReconvertHeaders(hs map[string][]string) [][2]string {
+	var ret [][2]string
+	for k, vs := range hs {
+		for _, v := range vs {
+			ret = append(ret, [2]string{k, v})
+		}
+	}
+	sort.SliceStable(ret, func(i, j int) bool {
+		return ret[i][0] < ret[j][0]
+	})
+	return ret
+}
+
 func GetRule(rules []*config.GrayRule, name string) *config.GrayRule {
 	for _, rule := range rules {
 		if rule.Name == name {
@@ -52,7 +93,66 @@ func GetRule(rules []*config.GrayRule, name string) *config.GrayRule {
 	return nil
 }
 
-func GetBySubKey(grayInfoStr string, graySubKey string) string {
+// 检查是否是页面
+var indexSuffixes = []string{
+	".html", ".htm", ".jsp", ".php", ".asp", ".aspx", ".erb", ".ejs", ".twig",
+}
+
+// IsIndexRequest determines if the request is an index request
+func IsIndexRequest(fetchMode string, p string) bool {
+	if fetchMode == "cors" {
+		return false
+	}
+	ext := path.Ext(p)
+	return ext == "" || ContainsValue(indexSuffixes, ext)
+}
+
+// 首页Rewrite
+func IndexRewrite(path, version string, matchRules map[string]string) string {
+	for prefix, rewrite := range matchRules {
+		if strings.HasPrefix(path, prefix) {
+			newPath := strings.Replace(rewrite, "{version}", version, -1)
+			return newPath
+		}
+	}
+	return path
+}
+
+func PrefixFileRewrite(path, version string, matchRules map[string]string) string {
+	var matchedPrefix, replacement string
+	for prefix, template := range matchRules {
+		if strings.HasPrefix(path, prefix) {
+			if len(prefix) > len(matchedPrefix) { // 找到更长的前缀
+				matchedPrefix = prefix
+				replacement = strings.Replace(template, "{version}", version, 1)
+			}
+		}
+	}
+	// 将path 中的前缀部分用 replacement 替换掉
+	newPath := strings.Replace(path, matchedPrefix, replacement+"/", 1)
+	return filepath.Clean(newPath)
+}
+
+func GetVersion(version string, cookies string, isIndex bool) string {
+	if isIndex {
+		return version
+	}
+	// 来自Cookie中的版本
+	cookieVersion := ExtractCookieValueByKey(cookies, config.XPreHigressTag)
+	// cookie 中为空，返回当前版本
+	if cookieVersion == "" {
+		return version
+	}
+
+	// cookie 中和当前版本不相同，返回cookie中值
+	if cookieVersion != version {
+		return cookieVersion
+	}
+	return version
+}
+
+// 从cookie中解析出灰度信息
+func getBySubKey(grayInfoStr string, graySubKey string) string {
 	// 首先对 URL 编码的字符串进行解码
 	jsonStr, err := url.QueryUnescape(grayInfoStr)
 	if err != nil {
@@ -68,3 +168,43 @@ func GetBySubKey(grayInfoStr string, graySubKey string) string {
 	// 返回字符串形式的值
 	return value.String()
 }
+
+func GetGrayKey(grayKeyValue string, graySubKey string) string {
+	// 如果有子key, 尝试从子key中获取值
+	if graySubKey != "" {
+		subKeyValue := getBySubKey(grayKeyValue, graySubKey)
+		if subKeyValue != "" {
+			grayKeyValue = subKeyValue
+		}
+	}
+	return grayKeyValue
+}
+
+// FilterGrayRule 过滤灰度规则
+func FilterGrayRule(grayConfig *config.GrayConfig, grayKeyValue string, logInfof func(format string, args ...interface{})) *config.GrayDeployment {
+	for _, grayDeployment := range grayConfig.GrayDeployments {
+		if !grayDeployment.Enabled {
+			// 跳过Enabled=false
+			continue
+		}
+		grayRule := GetRule(grayConfig.Rules, grayDeployment.Name)
+		// 首先：先校验用户名单ID
+		if grayRule.GrayKeyValue != nil && len(grayRule.GrayKeyValue) > 0 && grayKeyValue != "" {
+			if ContainsValue(grayRule.GrayKeyValue, grayKeyValue) {
+				logInfof("frontendVersion: %s, grayKeyValue: %s", grayDeployment.Version, grayKeyValue)
+				return grayDeployment
+			}
+		}
+		//	第二：校验Cookie中的 GrayTagKey
+		if grayRule.GrayTagKey != "" && grayRule.GrayTagValue != nil && len(grayRule.GrayTagValue) > 0 {
+			cookieStr, _ := proxywasm.GetHttpRequestHeader("cookie")
+			grayTagValue := ExtractCookieValueByKey(cookieStr, grayRule.GrayTagKey)
+			if ContainsValue(grayRule.GrayTagValue, grayTagValue) {
+				logInfof("frontendVersion: %s, grayTag: %s=%s", grayDeployment.Version, grayRule.GrayTagKey, grayTagValue)
+				return grayDeployment
+			}
+		}
+	}
+	logInfof("frontendVersion: %s, grayKeyValue: %s", grayConfig.BaseDeployment.Version, grayKeyValue)
+	return nil
+}