From 8a4d9dde1dbea2c845a0ae997f1548abca43fc43 Mon Sep 17 00:00:00 2001
From: "Gustavo \"Guz\" L. de Mello" <contact.guz013@gmail.com>
Date: Sat, 13 Jul 2024 17:58:55 -0300
Subject: [PATCH] feat: oauth client

---
 internals/auth/auth.go | 90 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 internals/auth/auth.go

diff --git a/internals/auth/auth.go b/internals/auth/auth.go
new file mode 100644
index 0000000..c7ad77e
--- /dev/null
+++ b/internals/auth/auth.go
@@ -0,0 +1,90 @@
+package auth
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"extrovert/templates/pages"
+	"io"
+	"log"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/a-h/templ"
+)
+
+type Client interface {
+	OAuthHandler(w http.ResponseWriter, r *http.Request)
+}
+
+type DefaultClient struct {
+	name string
+	tokenEndpoint url.URL
+	id          string
+	redirectUri string
+}
+
+func (c DefaultClient) OAuthHandler(w http.ResponseWriter, r *http.Request) {
+	code := r.URL.Query().Get("code")
+	if code == "" {
+		log.Fatalf("TODO-ERR missing code parameter")
+	}
+
+	req := c.tokenEndpoint
+
+	q := req.Query()
+	q.Add("grant_type", "authorization_code")
+	q.Add("code_verifier", "challenge")
+	q.Add("challenge_method", "plain")
+	q.Add("code", code)
+	q.Add("client_id", c.id)
+	q.Add("redirect_uri", c.redirectUri)
+
+	res, err := http.Post(req.String(), "application/x-www-form-urlencoded", bytes.NewReader([]byte("")))
+	if err != nil {
+		log.Fatalf("TODO-ERR trying to get token on %s, error:\n%s", req.Host, err)
+	}
+
+	body, err := io.ReadAll(res.Body)
+	if err != nil || res.StatusCode != 200 {
+		log.Fatalf("TODO-ERR trying to read body on %s, body:\n%s\n\nerror:\n%s", req.Host, body, err)
+	}
+
+	var token DefaultClientToken
+	err = json.Unmarshal(body, &token)
+	if err != nil {
+		log.Fatalf("TODO-ERR trying to parse json body to token:\n%s", err)
+	}
+
+	cookie := http.Cookie{
+		Name: strings.ToUpper("__Host-TOKEN-" + c.name),
+		// Value:    token.String(),
+		SameSite: http.SameSiteStrictMode,
+		Path:     "/",
+		Secure:   true,
+	}
+
+	http.SetCookie(w, &cookie)
+
+	err = pages.RedirectPopUp(
+		"Logged into "+c.name+"!",
+		"Your "+c.name+" account was succeffully logged into project-extrovert. ",
+		templ.SafeURL("/index.html"),
+	).Render(context.Background(), w)
+
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		log.Fatalf("TODO-ERR trying to render static page:\n%s", err)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+}
+
+type DefaultClientToken struct {
+	Type      string `json:"token_type"`
+	Token     string `json:"access_token"`
+	ExpiresIn int    `json:"expires_in"`
+	Scope     string `json:"scope"`
+}