英文:
Go GIN context parse unexpected query string
问题
我在REST请求中有不同的结构体用于查询。当查询字符串包含我结构体中未预期的参数时，我想返回HTTP 400: BAD REQUEST。
type FilterData struct {
Filter1 string `form:"filter_1"`
Filter2 string `form:"filter_2"`
Filter3 string `form:"filter_3"`
}
期望的请求是localhost:8000/testing?filter_1=123456&filter_2=test&filter_3=golang。
但是，如果请求是localhost:8000/users?FILTER1=123456&filter_2=test&filter_3=golang或者包含任何额外的参数，而不是我预期的结构体，我想返回bad request。
Go的gin.Context有一个函数c.ShouldBindQuery(&filterData)，但是这会将filter_1解析为空字符串，在我的情况下这是一个错误的请求。
我该如何使用一个通用函数来进行额外的检查？注意，结构体中的某些值可以是可选的。
英文:
I have different structs for the query in the REST request. I'd like to return HTTP 400: BAD REQUEST when the query string contains an unexpected parameter than my struct.
type FilterData struct {
Filter1 string `form:"filter_1"`
Filter2 string `form:"filter_2"`
Filter3 string `form:"filter_3"`
}
The expected request request is localhost:8000/testing?filter_1=123456&filter_2=test&filter_3=golang
But if the is request like localhost:8000/users?FILTER1=123456&filter_2=test&filter_3=golang or any extra parameter than my expected struct I want to return bad request.
Go gin.Context has c.ShouldBindQuery(&filterData) but this returns the filter_1 as an empty string, indeed in my case that's a bad request.
How would I do an extra check with a common function to all requests?
PS. some values in this struct can be optional.
答案1
得分: 1
在API中，忽略未知的查询参数是相当标准的做法。如果你要求某些参数始终具有值，可以在你的结构标签中使用binding:"required"属性。
如果你希望在出现未知查询参数时返回400错误，你需要检查c.Request.URL.Query()的内容。
英文:
It is pretty standard in apis to ignore unknown query parameters. If you require some parameters to always have value, use binding:"required" property in your struct tags.
https://github.com/gin-gonic/gin#model-binding-and-validation
If you want to throw back a 400 on unknown query params, you must check contents of c.Request.URL.Query().
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