auth.go
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auth.go
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	package writeas

	import (
	"fmt"
	"net/http"
	)

	// LogIn authenticates a user with Write.as.
	// See https://developer.write.as/docs/api/#authenticate-a-user
	func (c Client) LogIn(username, pass string) (AuthUser, error) {
	u := &AuthUser{}
	up := struct {
	Alias string `json:"alias"`
	Pass string `json:"pass"`
	}{
	Alias: username,
	Pass: pass,
	}

	env, err := c.post("/auth/login", up, u)
	if err != nil {
	return nil, err
	}

	var ok bool
	if u, ok = env.Data.(*AuthUser); !ok {
	return nil, fmt.Errorf("Wrong data returned from API.")
	}

	status := env.Code
	if status == http.StatusOK {
	return u, nil
	} else if status == http.StatusBadRequest {
	return nil, fmt.Errorf("Bad request: %s", env.ErrorMessage)
	} else if status == http.StatusUnauthorized {
	return nil, fmt.Errorf("Incorrect password.")
	} else if status == http.StatusNotFound {
	return nil, fmt.Errorf("User does not exist.")
	} else if status == http.StatusTooManyRequests {
	return nil, fmt.Errorf("Stop repeatedly trying to log in.")
	}
	return nil, fmt.Errorf("Problem authenticating: %d. %v\n", status, err)
	}

	func (c *Client) isNotLoggedIn(code int) bool {
	if c.token == "" {
	return false
	}
	return code == http.StatusUnauthorized
	}