| // Copyright 2016 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package dm |
| |
| import ( |
| "fmt" |
| |
| template "go.chromium.org/luci/common/data/text/templateproto" |
| ) |
| |
| // JSONObjectMaxLength is the maximum number of bytes that may be present in the |
| // Object field of a normalized JSONObject. |
| const JSONObjectMaxLength = 256 * 1024 |
| |
| // JSONNonNormalizedSizeFactor is the excess multiple of JSONObjectMaxLength |
| // that a non-normalized json object must be smaller than. Otherwise we won't |
| // attempt to normalize it at all. |
| const JSONNonNormalizedSizeFactor = 0.1 |
| |
| var jsonNonNormalizedSize int |
| |
| func init() { |
| // can't do this conversion statically because reasons |
| siz := JSONObjectMaxLength * (1 + JSONNonNormalizedSizeFactor) |
| jsonNonNormalizedSize = int(siz) |
| } |
| |
| // Normalize normalizes the JSONObject (ensures it's an object, removes |
| // whitespace, sorts keys, normalizes Size value, etc.) |
| func (j *JsonResult) Normalize() error { |
| if j == nil { |
| return nil |
| } |
| if j.Object == "" { |
| j.Size = 0 |
| return nil |
| } |
| if len(j.Object) > jsonNonNormalizedSize { |
| return fmt.Errorf( |
| "JSONObject.Object length exceeds max non-normalized length: %d > %d (max)", |
| len(j.Object), jsonNonNormalizedSize) |
| } |
| normed, err := template.NormalizeJSON(j.Object, true) |
| if err != nil { |
| return err |
| } |
| if len(normed) > JSONObjectMaxLength { |
| return fmt.Errorf( |
| "JSONObject.Object length exceeds max: %d > %d (max)", |
| len(normed), JSONObjectMaxLength) |
| } |
| j.Object = normed |
| j.Size = uint32(len(j.Object)) |
| return nil |
| } |