feat(api): implement new api handler

pkg/api/prelude/errors.go

@@ -0,0 +1,36 @@
+package prelude
+
+import "net/http"
+
+type errorResponse struct {
+	Error  string    `json:"error"`
+	Code   ErrorCode `json:"code"`
+	Status int       `json:"-"`
+}
+
+const internalErrorPayload string = `{ "error": "API internal error, check logs", "code": "API_INTERNAL_ERROR" }`
+
+type ErrorCode string
+
+var (
+	ErrUpdateRunning = errorResponse{
+		Code:   "UPDATE_RUNNING",
+		Error:  "Update already running",
+		Status: http.StatusConflict,
+	}
+	ErrNotFound = errorResponse{
+		Code:   "NOT_FOUND",
+		Error:  "Endpoint is not registered to a handler",
+		Status: http.StatusNotFound,
+	}
+	ErrInvalidToken = errorResponse{
+		Code:   "INVALID_TOKEN",
+		Error:  "The supplied token does not match the configured auth token",
+		Status: http.StatusUnauthorized,
+	}
+	ErrMissingToken = errorResponse{
+		Code:   "MISSING_TOKEN",
+		Error:  "No authentication token was supplied",
+		Status: http.StatusUnauthorized,
+	}
+)