[Refactor]: Core/API Split (#1506)

Refactors api folder to core, creates firm split between backend code and api frontend.

core/http/endpoints/openai/image.go

@@ -0,0 +1,48 @@
+package openai
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/go-skynet/LocalAI/core/backend"
+	"github.com/go-skynet/LocalAI/core/services"
+	"github.com/go-skynet/LocalAI/pkg/model"
+	"github.com/go-skynet/LocalAI/pkg/schema"
+	"github.com/gofiber/fiber/v2"
+	"github.com/rs/zerolog/log"
+)
+
+// https://platform.openai.com/docs/api-reference/images/create
+
+/*
+*
+
+	curl http://localhost:8080/v1/images/generations \
+	  -H "Content-Type: application/json" \
+	  -d '{
+	    "prompt": "A cute baby sea otter",
+	    "n": 1,
+	    "size": "512x512"
+	  }'
+
+*
+*/
+func ImageEndpoint(cl *services.ConfigLoader, ml *model.ModelLoader, so *schema.StartupOptions) func(c *fiber.Ctx) error {
+	return func(c *fiber.Ctx) error {
+		modelName, input, err := readInput(c, so, ml, true)
+		if err != nil {
+			return fmt.Errorf("failed reading parameters from request:%w", err)
+		}
+
+		resp, err := backend.ImageGenerationOpenAIRequest(modelName, input, cl, ml, so)
+		if err != nil {
+			return fmt.Errorf("error generating image request: +%w", err)
+		}
+
+		jsonResult, _ := json.Marshal(resp)
+		log.Debug().Msgf("Response: %s", jsonResult)
+
+		// Return the prediction in the response body
+		return c.JSON(resp)
+	}
+}