feat: add file storage settings and uploads

apps/api/internal/httpapi/file_upload_handlers.go

@@ -0,0 +1,58 @@
+package httpapi
+
+import (
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/clients"
+	"github.com/easyai/easyai-ai-gateway/apps/api/internal/runner"
+)
+
+const maxGatewayUploadBytes = 256 << 20
+
+func (s *Server) uploadFile(w http.ResponseWriter, r *http.Request) {
+	r.Body = http.MaxBytesReader(w, r.Body, maxGatewayUploadBytes)
+	if err := r.ParseMultipartForm(32 << 20); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid multipart upload")
+		return
+	}
+	file, header, err := r.FormFile("file")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "file is required")
+		return
+	}
+	defer file.Close()
+	payload, err := io.ReadAll(file)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "read upload file failed")
+		return
+	}
+	contentType := strings.TrimSpace(header.Header.Get("Content-Type"))
+	if contentType == "" && len(payload) > 0 {
+		contentType = http.DetectContentType(payload)
+	}
+	upload, err := s.runner.UploadFile(r.Context(), runner.FileUploadPayload{
+		Bytes:       payload,
+		ContentType: contentType,
+		FileName:    header.Filename,
+		Source:      firstNonEmptyFormValue(r, "source", "ai-gateway-openapi"),
+	})
+	if err != nil {
+		s.logger.Error("upload file failed", "error", err)
+		status := http.StatusBadGateway
+		if clients.ErrorCode(err) == "upload_no_channel" {
+			status = http.StatusServiceUnavailable
+		}
+		writeError(w, status, err.Error())
+		return
+	}
+	writeJSON(w, http.StatusOK, upload)
+}
+
+func firstNonEmptyFormValue(r *http.Request, key string, fallback string) string {
+	if value := strings.TrimSpace(r.FormValue(key)); value != "" {
+		return value
+	}
+	return fallback
+}