mihomo/common/convert/v.go

package convert

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/url"
	"strconv"
	"strings"
)

func handleVShareLink(names map[string]int, url *url.URL, scheme string, proxy map[string]any) error {
	// Xray VMessAEAD / VLESS share link standard
	// https://github.com/XTLS/Xray-core/discussions/716
	query := url.Query()
	proxy["name"] = uniqueName(names, url.Fragment)
	if url.Hostname() == "" {
		return errors.New("url.Hostname() is empty")
	}
	if url.Port() == "" {
		return errors.New("url.Port() is empty")
	}
	proxy["type"] = scheme
	proxy["server"] = url.Hostname()
	proxy["port"] = url.Port()
	proxy["uuid"] = url.User.Username()
	proxy["udp"] = true
	tls := strings.ToLower(query.Get("security"))
	if strings.HasSuffix(tls, "tls") || tls == "reality" {
		proxy["tls"] = true
		if fingerprint := query.Get("fp"); fingerprint == "" {
			proxy["client-fingerprint"] = "chrome"
		} else {
			proxy["client-fingerprint"] = fingerprint
		}
		if alpn := query.Get("alpn"); alpn != "" {
			proxy["alpn"] = strings.Split(alpn, ",")
		}
		if pcs := query.Get("pcs"); pcs != "" {
			proxy["fingerprint"] = pcs
		}
	}
	if sni := query.Get("sni"); sni != "" {
		proxy["servername"] = sni
	}
	if realityPublicKey := query.Get("pbk"); realityPublicKey != "" {
		proxy["reality-opts"] = map[string]any{
			"public-key": realityPublicKey,
			"short-id":   query.Get("sid"),
		}
	}

	switch query.Get("packetEncoding") {
	case "none":
	case "packet":
		proxy["packet-addr"] = true
	default:
		proxy["xudp"] = true
	}

	network := strings.ToLower(query.Get("type"))
	if network == "" {
		network = "tcp"
	}
	fakeType := strings.ToLower(query.Get("headerType"))
	if network == "tcp" && fakeType == "http" {
		network = "http"
	} else if network == "http" {
		network = "h2"
	}
	proxy["network"] = network
	switch network {
	case "tcp":
	case "http":
		headers := make(map[string]any)
		httpOpts := make(map[string]any)
		httpOpts["path"] = []string{"/"}

		if host := query.Get("host"); host != "" {
			headers["Host"] = []string{host}
		}

		if method := query.Get("method"); method != "" {
			httpOpts["method"] = method
		}

		if path := query.Get("path"); path != "" {
			httpOpts["path"] = []string{path}
		}
		httpOpts["headers"] = headers
		proxy["http-opts"] = httpOpts

	case "h2":
		h2Opts := make(map[string]any)
		h2Opts["path"] = "/"
		if path := query.Get("path"); path != "" {
			h2Opts["path"] = path
		}
		if host := query.Get("host"); host != "" {
			h2Opts["host"] = []string{host}
		}
		proxy["h2-opts"] = h2Opts

	case "ws", "httpupgrade":
		headers := make(map[string]any)
		wsOpts := make(map[string]any)
		headers["User-Agent"] = RandUserAgent()
		headers["Host"] = query.Get("host")
		wsOpts["path"] = query.Get("path")
		wsOpts["headers"] = headers

		if earlyData := query.Get("ed"); earlyData != "" {
			med, err := strconv.Atoi(earlyData)
			if err != nil {
				return fmt.Errorf("bad WebSocket max early data size: %v", err)
			}
			switch network {
			case "ws":
				wsOpts["max-early-data"] = med
				wsOpts["early-data-header-name"] = "Sec-WebSocket-Protocol"
			case "httpupgrade":
				wsOpts["v2ray-http-upgrade-fast-open"] = true
			}
		}
		if earlyDataHeader := query.Get("eh"); earlyDataHeader != "" {
			wsOpts["early-data-header-name"] = earlyDataHeader
		}

		proxy["ws-opts"] = wsOpts

	case "grpc":
		grpcOpts := make(map[string]any)
		grpcOpts["grpc-service-name"] = query.Get("serviceName")
		proxy["grpc-opts"] = grpcOpts

	case "xhttp":
		proxy["network"] = "xhttp"
		xhttpOpts := make(map[string]any)

		if path := query.Get("path"); path != "" {
			xhttpOpts["path"] = path
		}

		if host := query.Get("host"); host != "" {
			xhttpOpts["host"] = host
		}

		if mode := query.Get("mode"); mode != "" {
			xhttpOpts["mode"] = mode
		}

		if extra := query.Get("extra"); extra != "" {
			var extraMap map[string]any
			if err := json.Unmarshal([]byte(extra), &extraMap); err == nil {
				parseXHTTPExtra(extraMap, xhttpOpts)
			}
		}

		proxy["xhttp-opts"] = xhttpOpts
	}

	return nil
}

// parseXHTTPExtra maps xray-core extra JSON fields to mihomo xhttp-opts fields.
func parseXHTTPExtra(extra map[string]any, opts map[string]any) {
	// xmuxToReuse converts an xmux map to mihomo reuse-settings.
	xmuxToReuse := func(xmux map[string]any) map[string]any {
		reuse := make(map[string]any)
		set := func(src, dst string) {
			if v, ok := xmux[src]; ok {
				switch val := v.(type) {
				case string:
					if val != "" {
						reuse[dst] = val
					}
				case float64:
					reuse[dst] = strconv.FormatInt(int64(val), 10)
				}
			}
		}
		set("maxConnections", "max-connections")
		set("maxConcurrency", "max-concurrency")
		set("cMaxReuseTimes", "c-max-reuse-times")
		set("hMaxRequestTimes", "h-max-request-times")
		set("hMaxReusableSecs", "h-max-reusable-secs")
		if v, ok := xmux["hKeepAlivePeriod"].(float64); ok {
			reuse["h-keep-alive-period"] = int(v)
		}
		return reuse
	}

	if v, ok := extra["noGRPCHeader"].(bool); ok && v {
		opts["no-grpc-header"] = true
	}

	if v, ok := extra["xPaddingBytes"].(string); ok && v != "" {
		opts["x-padding-bytes"] = v
	}

	if v, ok := extra["xPaddingObfsMode"].(bool); ok {
		opts["x-padding-obfs-mode"] = v
	}

	if v, ok := extra["xPaddingKey"].(string); ok && v != "" {
		opts["x-padding-key"] = v
	}

	if v, ok := extra["xPaddingHeader"].(string); ok && v != "" {
		opts["x-padding-header"] = v
	}

	if v, ok := extra["xPaddingPlacement"].(string); ok && v != "" {
		opts["x-padding-placement"] = v
	}

	if v, ok := extra["xPaddingMethod"].(string); ok && v != "" {
		opts["x-padding-method"] = v
	}

	if v, ok := extra["uplinkHttpMethod"].(string); ok && v != "" {
		opts["uplink-http-method"] = v
	}

	if v, ok := extra["sessionPlacement"].(string); ok && v != "" {
		opts["session-placement"] = v
	}

	if v, ok := extra["sessionKey"].(string); ok && v != "" {
		opts["session-key"] = v
	}

	if v, ok := extra["seqPlacement"].(string); ok && v != "" {
		opts["seq-placement"] = v
	}

	if v, ok := extra["seqKey"].(string); ok && v != "" {
		opts["seq-key"] = v
	}

	if v, ok := extra["uplinkDataPlacement"].(string); ok && v != "" {
		opts["uplink-data-placement"] = v
	}

	if v, ok := extra["uplinkDataKey"].(string); ok && v != "" {
		opts["uplink-data-key"] = v
	}

	if v, ok := extra["uplinkChunkSize"].(float64); ok {
		opts["uplink-chunk-size"] = int(v)
	}

	if v, ok := extra["scMaxEachPostBytes"].(float64); ok {
		opts["sc-max-each-post-bytes"] = int(v)
	}

	if v, ok := extra["scMinPostsIntervalMs"].(float64); ok {
		opts["sc-min-posts-interval-ms"] = int(v)
	}

	// xmux in root extra → reuse-settings
	if xmuxAny, ok := extra["xmux"].(map[string]any); ok && len(xmuxAny) > 0 {
		if reuse := xmuxToReuse(xmuxAny); len(reuse) > 0 {
			opts["reuse-settings"] = reuse
		}
	}

	if dsAny, ok := extra["downloadSettings"].(map[string]any); ok {
		ds := make(map[string]any)

		if addr, ok := dsAny["address"].(string); ok && addr != "" {
			ds["server"] = addr
		}

		if port, ok := dsAny["port"].(float64); ok {
			ds["port"] = int(port)
		}

		sec := ""
		if s, ok := dsAny["security"].(string); ok {
			sec = strings.ToLower(s)
		}

		if sec == "tls" || sec == "reality" {
			ds["tls"] = true

			if tlsAny, ok := dsAny["tlsSettings"].(map[string]any); ok {
				if sn, ok := tlsAny["serverName"].(string); ok && sn != "" {
					ds["servername"] = sn
				}
				if fp, ok := tlsAny["fingerprint"].(string); ok && fp != "" {
					ds["client-fingerprint"] = fp
				}
				if alpnAny, ok := tlsAny["alpn"].([]any); ok && len(alpnAny) > 0 {
					alpnList := make([]string, 0, len(alpnAny))
					for _, a := range alpnAny {
						if s, ok := a.(string); ok {
							alpnList = append(alpnList, s)
						}
					}
					if len(alpnList) > 0 {
						ds["alpn"] = alpnList
					}
				}
				if v, ok := tlsAny["allowInsecure"].(bool); ok && v {
					ds["skip-cert-verify"] = true
				}
			}

			if sec == "reality" {
				if realityAny, ok := dsAny["realitySettings"].(map[string]any); ok {
					realityOpts := make(map[string]any)
					if pk, ok := realityAny["publicKey"].(string); ok && pk != "" {
						realityOpts["public-key"] = pk
					}
					if sid, ok := realityAny["shortId"].(string); ok && sid != "" {
						realityOpts["short-id"] = sid
					}
					if len(realityOpts) > 0 {
						ds["reality-opts"] = realityOpts
					}
				}
			}
		}

		if xhttpAny, ok := dsAny["xhttpSettings"].(map[string]any); ok {
			if path, ok := xhttpAny["path"].(string); ok && path != "" {
				ds["path"] = path
			}
			if host, ok := xhttpAny["host"].(string); ok && host != "" {
				ds["host"] = host
			}
			if headers, ok := xhttpAny["headers"].(map[string]any); ok && len(headers) > 0 {
				ds["headers"] = headers
			}

			// xmux inside downloadSettings.xhttpSettings.extra → download-settings.reuse-settings
			if dsExtraAny, ok := xhttpAny["extra"].(map[string]any); ok {
				if xmuxAny, ok := dsExtraAny["xmux"].(map[string]any); ok && len(xmuxAny) > 0 {
					if reuse := xmuxToReuse(xmuxAny); len(reuse) > 0 {
						ds["reuse-settings"] = reuse
					}
				}
			}
		}

		if len(ds) > 0 {
			opts["download-settings"] = ds
		}
	}
}