Add auth.BasicFunc

[attilaolah]

This only includes the implementation and some tests. Give me a moment and I'll update the README.

[attilaolah]

Added documentation. Should be good to merge.

[schickling]

I'm still not sure how to inject something into the middleware e.g. a DB object.

[schickling]

@attilaolah @codegangsta could someone provide an example please?

[attilaolah]

@schickling just make it available to the closure you pass in to auth.BasicFunc, something like:

db := dbSetup(…)
m.Use(auth.BasicFunc(func(username, password string) bool {
    user := db.Get(username)
    return user != nil && auth.SecureCompare(password, user.Password)
})

[schickling]

Is there another way by using the dependency injection inside via the m.Use(...) params? I don't think its a good idea to have a global db variable.

[attilaolah]

I don't think its a good idea to have a global db variable.

Of course it doesn't have to be global.

Currently auth.BasicFunc does not support Martini-style DI. What you can try instead, if you really don't like the closure, is to pass in a struct method instead:

type DBAuth struct {
    db Database
}

func (a *DBAuth) auth(username, password string) bool {
    user := a.db.get(username)
    return user != nil && auth.SecureCompare(user.Password, password)
}

func main() {
    // …
    m.Use(auth.BasicFunc((&DBAuth{
        db: dbSetup(),
    }).auth))
}

This has basically the same effect as using a closure, only it uses a struct instead.

[schickling]

Thanks for the solution! Are there any plans to add DI to this project?

[attilaolah]

There were some discussions earlier, but I'm not sure anyone's too keen on implementing this. See #18.

I know the DI is cool but I still prefer good old closures or struct methods. But if you want to implement it, feel free to do so and send a PR.