Implementing the Route Handlers

In the user route handler, the showRegistrationPage handler should show the registration page to unauthenticated users while the register handler should handle the registration request.

After implementing these handlers, handlers.user.go should look as follows:

// handlers.user.go

package main

import (
    "math/rand"
    "net/http"
    "strconv"

    "github.com/gin-gonic/gin"
)

func generateSessionToken() string {
    // We're using a random 16 character string as the session token
    // This is NOT a secure way of generating session tokens
    // DO NOT USE THIS IN PRODUCTION
    return strconv.FormatInt(rand.Int63(), 16)
}

func showRegistrationPage(c *gin.Context) {
    // Call the render function with the name of the template to render
    render(c, gin.H{
        "title": "Register"}, "register.html")
}

func register(c *gin.Context) {
    // Obtain the POSTed username and password values
    username := c.PostForm("username")
    password := c.PostForm("password")

    if _, err := registerNewUser(username, password); err == nil {
        // If the user is created, set the token in a cookie and log the user in
        token := generateSessionToken()
        c.SetCookie("token", token, 3600, "", "", false, true)
        c.Set("is_logged_in", true)

        render(c, gin.H{
            "title": "Successful registration & Login"}, "login-successful.html")

    } else {
        // If the username/password combination is invalid,
        // show the error message on the login page
        c.HTML(http.StatusBadRequest, "register.html", gin.H{
            "ErrorTitle":   "Registration Failed",
            "ErrorMessage": err.Error()})

    }
}

If we run the tests again, we'll see the following output:

=== RUN   TestArticleXML
[GIN] 2016/08/04 - 09:13:30 | 200 |      27.544µs |  |   GET     /article/view/1
--- PASS: TestArticleXML (0.00s)
=== RUN   TestShowRegistrationPageUnauthenticated
[GIN] 2016/08/04 - 09:13:30 | 200 |      96.805µs |  |   GET     /u/register
--- PASS: TestShowRegistrationPageUnauthenticated (0.00s)
=== RUN   TestRegisterUnauthenticated
[GIN] 2016/08/04 - 09:13:30 | 200 |     107.286µs |  |   POST    /u/register
--- PASS: TestRegisterUnauthenticated (0.00s)
=== RUN   TestRegisterUnauthenticatedUnavailableUsername
[GIN] 2016/08/04 - 09:13:30 | 400 |      116.63µs |  |   POST    /u/register
--- PASS: TestRegisterUnauthenticatedUnavailableUsername (0.00s)
=== RUN   TestGetAllArticles
--- PASS: TestGetAllArticles (0.00s)
=== RUN   TestGetArticleByID
--- PASS: TestGetArticleByID (0.00s)
=== RUN   TestValidUserRegistration
--- PASS: TestValidUserRegistration (0.00s)
=== RUN   TestInvalidUserRegistration
--- PASS: TestInvalidUserRegistration (0.00s)
=== RUN   TestUsernameAvailability
--- PASS: TestUsernameAvailability (0.00s)
PASS
ok      github.com/demo-apps/go-gin-app 0.007s

With the registration functionality complete, it's time to allow users to log in and log out.