Version 3 starter

backend/internal/api/middleware/schema.go

@@ -0,0 +1,55 @@
+package middleware
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	c "npm/internal/api/context"
+	h "npm/internal/api/http"
+
+	"github.com/qri-io/jsonschema"
+)
+
+// CheckRequestSchema ...
+func CheckRequestSchema(ctx context.Context, schemaData string, payload []byte) ([]jsonschema.KeyError, error) {
+	// Create root schema
+	rs := &jsonschema.Schema{}
+	if err := json.Unmarshal([]byte(schemaData), rs); err != nil {
+		return nil, fmt.Errorf("Schema Fatal: %v", err)
+	}
+
+	// Validate it
+	schemaErrors, jsonError := rs.ValidateBytes(ctx, payload)
+	if jsonError != nil {
+		return nil, jsonError
+	}
+
+	return schemaErrors, nil
+}
+
+// EnforceRequestSchema accepts a schema and validates the request body against it
+func EnforceRequestSchema(schemaData string) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+			// Get content from context
+			bodyBytes, _ := r.Context().Value(c.BodyCtxKey).([]byte)
+
+			schemaErrors, err := CheckRequestSchema(r.Context(), schemaData, bodyBytes)
+			if err != nil {
+				h.ResultErrorJSON(w, r, http.StatusInternalServerError, fmt.Sprintf("Schema Fatal: %v", err), nil)
+				return
+			}
+
+			if len(schemaErrors) > 0 {
+				h.ResultSchemaErrorJSON(w, r, schemaErrors)
+				return
+			}
+
+			// All good
+			next.ServeHTTP(w, r)
+		})
+	}
+}