fix: preserve explicit zero values in native relay requests

relay/channel/perplexity/adaptor.go

@@ -12,6 +12,7 @@ import (
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
 	relayconstant "github.com/QuantumNous/new-api/relay/constant"
 	"github.com/QuantumNous/new-api/types"
+	"github.com/samber/lo"
 
 	"github.com/gin-gonic/gin"
 )
@@ -59,8 +60,8 @@ func (a *Adaptor) ConvertOpenAIRequest(c *gin.Context, info *relaycommon.RelayIn
 	if request == nil {
 		return nil, errors.New("request is nil")
 	}
-	if request.TopP >= 1 {
-		request.TopP = 0.99
+	if lo.FromPtrOr(request.TopP, 0) >= 1 {
+		request.TopP = lo.ToPtr(0.99)
 	}
 	return requestOpenAI2Perplexity(*request), nil
 }

relay/channel/perplexity/relay-perplexity.go

@@ -10,13 +10,12 @@ func requestOpenAI2Perplexity(request dto.GeneralOpenAIRequest) *dto.GeneralOpen
 			Content: message.Content,
 		})
 	}
-	return &dto.GeneralOpenAIRequest{
+	req := &dto.GeneralOpenAIRequest{
 		Model:                  request.Model,
 		Stream:                 request.Stream,
 		Messages:               messages,
 		Temperature:            request.Temperature,
 		TopP:                   request.TopP,
-		MaxTokens:              request.GetMaxTokens(),
 		FrequencyPenalty:       request.FrequencyPenalty,
 		PresencePenalty:        request.PresencePenalty,
 		SearchDomainFilter:     request.SearchDomainFilter,
@@ -25,4 +24,9 @@ func requestOpenAI2Perplexity(request dto.GeneralOpenAIRequest) *dto.GeneralOpen
 		ReturnRelatedQuestions: request.ReturnRelatedQuestions,
 		SearchMode:             request.SearchMode,
 	}
+	if request.MaxTokens != nil || request.MaxCompletionTokens != nil {
+		maxTokens := request.GetMaxTokens()
+		req.MaxTokens = &maxTokens
+	}
+	return req
 }