redact 
redact is a Golang library for redacting sensitive values from a struct. This
is useful when you're logging requests and responses on a server, but some
payloads contain secrets or other values that shouldn't be logged.
Example
redact provides a Redact function that takes a path and the value you want
to mutate. It works on struct elements:
import "github.com/ucarion/redact"
type User struct {
Name string
Password string
}
user := User{Name: "John", Password: "letmein"}
fmt.Println(user) // {John letmein}
redact.Redact([]string{"Password"}, &user)
fmt.Println(user) // {John }This works even if the data you want to redact is nested:
type CreateUserRequest struct {
RequestID string
User User
}
req := CreateUserRequest{RequestID: "abc", User: User{Name: "John", Password: "letmein"}}
fmt.Println(req) // {abc {John letmein}}
redact.Redact([]string{"User", "Password"}, &req)
fmt.Println(req) // {abc {John }}It also works on arrays and slices. In that case, every element of the array or slice gets recursively redacted:
users := []User{
User{Name: "John", Password: "letmein"},
User{Name: "Mary", Password: "123456"},
}
fmt.Println(users) // [{John letmein}, {Mary 123456}]
redact.Redact([]string{"Password"}, &users)
fmt.Println(users) // [{John }, {Mary }]It also works on maps in a way similar to structs.
user := map[string]string{
"Name": "John",
"Password": "letmein",
}
fmt.Println(user) // {Name: John, Password: letmein}
redact.Redact([]string{"Password"}, &user)
fmt.Println(user) // {Name: John, Password: }Note, however, that Go does not support mutating map elements. That's not
something any package can work around. So if you want to mutate elements of a
map (in the example above, we replaced Password, not modified it). You'll
have to make the map elements be pointers:
users := map[string]*User{
"a": &User{Name: "John", Password: "letmein"},
}
fmt.Println(users["a"]) // &{John letmein}
redact.Redact([]string{"a", "Password"}, &users)
fmt.Println(users["a"]) // &{John }
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