英文:
OPA (Rego) as Go lib: How to apply external data?
问题
我按照https://www.openpolicyagent.org/docs/latest/#5-try-opa-as-a-go-library的示例进行了操作。重要的代码片段：
r := rego.New(rego.Query("x = data.example.allow"),rego.Load([]string{"./example.rego"}, nil)...rs, err := query.Eval(ctx, rego.EvalInput(input))...
我该如何添加外部数据（data.json），以便在rego策略中使用，例如data.wantedName来访问它？
我尝试阅读go文档和示例，但没有找到有用的信息。
谢谢！
英文:
I followed the example of https://www.openpolicyagent.org/docs/latest/#5-try-opa-as-a-go-library. Important code snippets:
r := rego.New(rego.Query("x = data.example.allow"),rego.Load([]string{"./example.rego"}, nil)...rs, err := query.Eval(ctx, rego.EvalInput(input))...
How can I add external data (data.json) such that I can use, e.g., data.wantedName in the rego policy to access it?
I tried to read through the go doc and the examples but I couldn't find any helpful information.
Thanks!
答案1
得分: 6
你看过rego.Store()的文档和这个示例吗？
对于简单的情况，可以按照以下方式进行操作：
data := `{"example": {"users": [{"name": "alice","likes": ["dogs", "clouds"]},{"name": "bob","likes": ["pizza", "cats"]}]}}`var json map[string]interface{}err := util.UnmarshalJSON([]byte(data), &json)if err != nil {// 处理错误。}store := inmem.NewFromObject(json)// 创建返回值的新查询rego := rego.New(rego.Query("data.example.users[0].likes"),rego.Store(store))
如果需要更复杂的用法，你可以自己实现存储方式，但这将会更加复杂。如果可以通过将inmem.NewFromObject()存储传递给rego.New()来解决问题，建议首先尝试这种方法。
英文:
Have you seen the docs on rego.Store() and this example?
Something along these lines should do the trick for simple cases:
data := `{"example": {"users": [{"name": "alice","likes": ["dogs", "clouds"]},{"name": "bob","likes": ["pizza", "cats"]}]}}`var json map[string]interface{}err := util.UnmarshalJSON([]byte(data), &json)if err != nil {// Handle error.}store := inmem.NewFromObject(json)// Create new query that returns the valuerego := rego.New(rego.Query("data.example.users[0].likes"),rego.Store(store))
You could implement your own storage for more intricate uses, but that's going to be a lot more involved. If you get by with feeding inmem.NewFromObject() stores into rego.New(), you should try that first.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论