Added validation for prompt length in

relayImageHelper function

common/model-ratio.go

@@ -18,12 +18,16 @@ var DalleSizeRatios = map[string]map[string]float64{
 	},
 }
 
-// Array in values, of maxmium and minimum
 var DalleGenerationImageAmounts = map[string][2]int{
 	"dall-e-2": {1, 10},
 	"dall-e-3": {1, 1}, // OpenAI allows n=1 currently.
 }
 
+var DalleImagePromptLengthLimitations = map[string]int{
+	"dall-e-2": 1000,
+	"dall-e-3": 4000,
+}
+
 // ModelRatio
 // https://platform.openai.com/docs/models/model-endpoint-compatibility
 // https://cloud.baidu.com/doc/WENXINWORKSHOP/s/Blfmc9dlf