322 lines
12 KiB
Go
322 lines
12 KiB
Go
package handler
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"mime"
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"mime/multipart"
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"net/http"
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"net/url"
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"path"
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"regexp"
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"strconv"
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"strings"
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"time"
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"infinite-canvas/backend/internal/model"
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"infinite-canvas/backend/internal/service"
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"github.com/gin-gonic/gin"
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)
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var (
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runtimeService *service.Service
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geminiGeneratePath = regexp.MustCompile(`^/models/([^/:]+):(generateContent|streamGenerateContent)$`)
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customGeminiRelayPath = regexp.MustCompile(`(?:^|/)models/[^/:]+:(generateContent|streamGenerateContent|predictLongRunning)$`)
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customVideoTaskPath = regexp.MustCompile(`(?:^|/)video/generations/[^/]+$`)
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customXAIVideoTaskPath = regexp.MustCompile(`(?:^|/)videos/[^/]+$`)
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customVideoContentPath = regexp.MustCompile(`(?:^|/)videos/[^/]+/content$`)
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customArkVideoTaskPath = regexp.MustCompile(`(?:^|/)contents/generations/tasks/[^/]+$`)
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customGeminiOperationPath = regexp.MustCompile(`(?:^|/)(?:models/[^/]+/)?operations/[^/]+$`)
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customNovitaTaskResultPath = regexp.MustCompile(`(?:^|/)async/task-result$`)
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customMiniMaxTaskPath = regexp.MustCompile(`(?:^|/)v2/query/video_generation/[^/]+$`)
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systemMiniMaxTaskPath = regexp.MustCompile(`^/v2/query/video_generation/[^/]+$`)
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openAIPostEndpoints = map[string]bool{
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"/responses": true, "/chat/completions": true, "/images/generations": true, "/images/edits": true,
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"/audio/speech": true, "/messages": true,
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}
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)
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func ConfigureRuntime(svc *service.Service) {
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runtimeService = svc
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}
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func authorizeCustomRelay(method string, target *url.URL, apiFormat string, contentType string) error {
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requestPath, err := normalizedCustomRelayPath(target.EscapedPath())
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if err != nil {
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return err
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}
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query, err := url.ParseQuery(target.RawQuery)
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if err != nil {
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return errors.New("自定义渠道查询参数无效")
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}
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for key := range query {
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switch strings.ToLower(strings.TrimSpace(key)) {
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case "key", "api_key", "access_token", "token":
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return errors.New("自定义渠道地址不允许在查询参数中携带密钥")
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}
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}
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apiFormat = strings.ToLower(strings.TrimSpace(apiFormat))
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if apiFormat != "openai" && apiFormat != "gemini" && apiFormat != "claude" {
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return errors.New("自定义渠道调用格式无效")
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}
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if method == http.MethodGet {
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if customNovitaTaskResultPath.MatchString(requestPath) {
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if len(query) == 1 && len(query["task_id"]) == 1 && strings.TrimSpace(query.Get("task_id")) != "" {
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return nil
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}
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return errors.New("自定义渠道不允许访问该上游接口")
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}
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allowed := requestPath == "/models" || strings.HasSuffix(requestPath, "/models")
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if apiFormat == "openai" {
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allowed = allowed || customVideoTaskPath.MatchString(requestPath) || customXAIVideoTaskPath.MatchString(requestPath) || customVideoContentPath.MatchString(requestPath) || customArkVideoTaskPath.MatchString(requestPath) || customMiniMaxTaskPath.MatchString(requestPath)
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} else if apiFormat == "gemini" {
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allowed = allowed || customGeminiOperationPath.MatchString(requestPath)
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}
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if len(query) != 0 || !allowed {
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return errors.New("自定义渠道不允许访问该上游接口")
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}
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return nil
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}
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if method != http.MethodPost {
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return errors.New("自定义渠道不允许使用该请求方法")
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}
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mediaType, _, err := mime.ParseMediaType(contentType)
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if err != nil {
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return errors.New("自定义渠道生成请求类型无效")
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}
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if apiFormat == "openai" {
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multipartAllowed := mediaType == "multipart/form-data" && (strings.HasSuffix(requestPath, "/images/edits") || strings.HasSuffix(requestPath, "/videos"))
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jsonAllowed := mediaType == "application/json" && (strings.HasSuffix(requestPath, "/responses") || strings.HasSuffix(requestPath, "/chat/completions") || strings.HasSuffix(requestPath, "/images/generations") || strings.HasSuffix(requestPath, "/images/edits") || strings.HasSuffix(requestPath, "/audio/speech") || strings.HasSuffix(requestPath, "/video/generations") || strings.HasSuffix(requestPath, "/videos/generations") || strings.HasSuffix(requestPath, "/videos") || strings.HasSuffix(requestPath, "/contents/generations/tasks") || strings.HasSuffix(requestPath, "/video/create") || strings.HasSuffix(requestPath, "/v2/video_generation"))
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if len(query) != 0 || (!multipartAllowed && !jsonAllowed) {
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return errors.New("自定义渠道不允许访问该上游接口")
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}
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return nil
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}
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if apiFormat == "claude" {
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if mediaType != "application/json" || !strings.HasSuffix(requestPath, "/messages") {
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return errors.New("Claude 自定义渠道只允许 application/json 的 /messages 请求")
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}
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return nil
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}
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if mediaType != "application/json" {
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return errors.New("Gemini 自定义渠道生成请求必须使用 application/json")
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}
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if !customGeminiRelayPath.MatchString(requestPath) {
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return errors.New("自定义渠道不允许访问该上游接口")
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}
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if len(query) == 0 {
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return nil
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}
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if len(query) == 1 && len(query["alt"]) == 1 && query.Get("alt") == "sse" && strings.HasSuffix(requestPath, ":streamGenerateContent") {
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return nil
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}
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return errors.New("自定义渠道不允许使用该查询参数")
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}
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func normalizedCustomRelayPath(value string) (string, error) {
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if len(value) > 2048 {
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return "", errors.New("自定义渠道请求路径过长")
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}
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decoded, err := url.PathUnescape(value)
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if err != nil || strings.Contains(decoded, "\\") || strings.Contains(decoded, "\x00") {
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return "", errors.New("自定义渠道请求路径无效")
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}
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cleaned := path.Clean("/" + strings.TrimPrefix(decoded, "/"))
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if cleaned != decoded && cleaned != "/"+strings.TrimPrefix(decoded, "/") {
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return "", errors.New("自定义渠道请求路径无效")
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}
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return cleaned, nil
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}
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func enforceRateLimit(c *gin.Context, key string, limit int, window time.Duration) bool {
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if runtimeService == nil {
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fail(c, http.StatusServiceUnavailable, errors.New("请求协调器尚未初始化"))
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return false
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}
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allowed, err := runtimeService.AllowRequest(c.Request.Context(), key, limit, window)
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if err != nil {
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fail(c, http.StatusServiceUnavailable, errors.New("请求协调服务暂时不可用"))
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return false
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}
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if allowed {
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return true
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}
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c.Header("Retry-After", "60")
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fail(c, http.StatusTooManyRequests, errors.New("请求过于频繁，请稍后再试"))
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return false
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}
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func loadRuntimePolicy(c *gin.Context, svc *service.Service) (service.RuntimePolicySetting, bool) {
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policy, err := svc.RuntimePolicy()
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if err != nil {
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failInternal(c, http.StatusServiceUnavailable, err)
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return service.RuntimePolicySetting{}, false
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}
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return policy, true
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}
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func authorizeSystemProxy(channel *model.ModelChannel, protocol model.ChannelInterfaceType, method string, requestPath string, contentType string, body []byte) error {
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requestPath, err := normalizedProxyPath(requestPath)
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if err != nil {
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return err
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}
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if method == http.MethodGet && requestPath == "/models" {
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return nil
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}
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if protocol == model.ChannelInterfaceMiniMaxVideo {
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if method == http.MethodGet && systemMiniMaxTaskPath.MatchString(requestPath) {
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return nil
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}
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if method != http.MethodPost || requestPath != "/v2/video_generation" {
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return errors.New("系统渠道不允许访问该上游接口")
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}
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mediaType, _, err := mime.ParseMediaType(contentType)
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if err != nil || mediaType != "application/json" {
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return errors.New("MiniMax 视频生成请求必须使用 application/json")
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}
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modelName := proxyRequestModel(contentType, body)
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if modelName == "" || !channelAllowsModel(channel, modelName) {
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return errors.New("当前系统渠道未授权该模型")
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}
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return nil
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}
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if protocol == model.ChannelInterfaceGeminiVeo || protocol == model.ChannelInterfaceGeminiImage {
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matches := geminiGeneratePath.FindStringSubmatch(requestPath)
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if method != http.MethodPost || len(matches) != 3 {
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return errors.New("系统渠道不允许访问该上游接口")
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}
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modelName, err := url.PathUnescape(matches[1])
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if err != nil || !channelAllowsModel(channel, modelName) {
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return errors.New("当前系统渠道未授权该模型")
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}
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return nil
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}
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if method != http.MethodPost || !openAIPostEndpoints[requestPath] {
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return errors.New("系统渠道不允许访问该上游接口")
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}
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if protocol != "" && !interfaceAllowsProxyPath(protocol, requestPath) {
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return errors.New("当前接口类型不允许访问该上游接口")
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}
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modelName := proxyRequestModel(contentType, body)
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if modelName == "" || !channelAllowsModel(channel, modelName) {
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return errors.New("当前系统渠道未授权该模型")
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}
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return nil
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}
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func interfaceAllowsProxyPath(interfaceType model.ChannelInterfaceType, requestPath string) bool {
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switch interfaceType {
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case model.ChannelInterfaceChatCompletion:
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return requestPath == "/chat/completions"
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case model.ChannelInterfaceOpenAIResponse:
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return requestPath == "/responses"
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case model.ChannelInterfaceClaudeAPI:
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return requestPath == "/messages"
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case model.ChannelInterfaceOpenAIImage, model.ChannelInterfaceGrokImage:
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return requestPath == "/images/generations" || requestPath == "/images/edits"
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case model.ChannelInterfaceVolcengineArkImage:
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return requestPath == "/images/generations"
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case model.ChannelInterfaceOpenAIAudio:
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return requestPath == "/audio/speech"
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case model.ChannelInterfaceAsyncAudio, model.ChannelInterfaceNewAPIVideo, model.ChannelInterfaceNewAPIChannel1, model.ChannelInterfaceNewAPIChannel2, model.ChannelInterfaceXAIVideo, model.ChannelInterfaceVolcengineArkVideo, model.ChannelInterfaceVolcengineJiMengImage, model.ChannelInterfaceVolcengineJiMengVideo, model.ChannelInterfaceGeminiVeo, model.ChannelInterfaceGeminiImage, model.ChannelInterfaceNovitaVideo, model.ChannelInterfaceMiniMaxVideo:
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return false
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default:
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return true
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}
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}
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func normalizedProxyPath(value string) (string, error) {
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decoded, err := url.PathUnescape(value)
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if err != nil || strings.Contains(decoded, "\\") || strings.Contains(decoded, "\x00") {
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return "", errors.New("系统渠道请求路径无效")
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}
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cleaned := path.Clean("/" + strings.TrimPrefix(decoded, "/"))
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if cleaned != decoded && cleaned != "/"+strings.TrimPrefix(decoded, "/") {
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return "", errors.New("系统渠道请求路径无效")
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}
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return cleaned, nil
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}
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func channelAllowsModel(channel *model.ModelChannel, requested string) bool {
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requested = strings.TrimPrefix(strings.TrimSpace(requested), "models/")
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var models []string
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_ = json.Unmarshal([]byte(channel.ModelsJSON), &models)
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for _, configured := range models {
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if strings.TrimPrefix(strings.TrimSpace(configured), "models/") == requested {
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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 proxyRequestModel(contentType string, body []byte) string {
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mediaType, params, _ := mime.ParseMediaType(contentType)
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if strings.HasPrefix(mediaType, "multipart/") {
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reader := multipart.NewReader(bytes.NewReader(body), params["boundary"])
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for {
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part, err := reader.NextPart()
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if err != nil {
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return ""
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}
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if part.FormName() == "model" {
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value, _ := io.ReadAll(io.LimitReader(part, 1024))
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return strings.TrimSpace(string(value))
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}
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_ = part.Close()
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}
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}
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var payload map[string]interface{}
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if json.Unmarshal(body, &payload) != nil {
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return ""
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}
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modelName, _ := payload["model"].(string)
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return strings.TrimSpace(modelName)
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}
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func proxyRequestModelForPath(requestPath string, contentType string, body []byte) string {
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if matches := geminiGeneratePath.FindStringSubmatch(requestPath); len(matches) == 3 {
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modelName, err := url.PathUnescape(matches[1])
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if err == nil {
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return strings.TrimPrefix(strings.TrimSpace(modelName), "models/")
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}
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}
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return proxyRequestModel(contentType, body)
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}
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func proxyRequestVideoSeconds(contentType string, body []byte) int64 {
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mediaType, params, _ := mime.ParseMediaType(contentType)
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if strings.HasPrefix(mediaType, "multipart/") {
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reader := multipart.NewReader(bytes.NewReader(body), params["boundary"])
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for {
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part, err := reader.NextPart()
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if err != nil {
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return 0
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}
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if part.FormName() == "seconds" || part.FormName() == "duration" {
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value, _ := io.ReadAll(io.LimitReader(part, 32))
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seconds, _ := strconv.ParseInt(strings.TrimSpace(string(value)), 10, 64)
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return seconds
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}
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_ = part.Close()
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}
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}
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var payload map[string]any
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if json.Unmarshal(body, &payload) != nil {
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return 0
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}
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for _, key := range []string{"seconds", "duration"} {
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value, exists := payload[key]
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if !exists {
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continue
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}
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seconds, _ := strconv.ParseInt(strings.TrimSpace(fmt.Sprint(value)), 10, 64)
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return seconds
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}
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return 0
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}
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