Refactor /signup to /login to be more clear

(Actually the signup and login process is the same)

public/api/login/mastodon/get_client.php

@@ -9,7 +9,7 @@ if ($instance === false) {
 
 $app_name      = conf('app_name', 'RealFan');
 $site_name     = conf('site_name', HOST_DEV);
-$redirect_uris = conf('site_name', HOST_DEV).'/signup/mastodon:oauth';
+$redirect_uris = conf('site_name', HOST_DEV).'/login/mastodon:oauth';
 $scopes        = 'read:accounts write';
 
 # create the Authorization App

public/index.php

@@ -20,7 +20,7 @@ $p = [
 		<div class="row">
 			<div class="one-half column">
 				<h4 class="hero-heading"><?php l('home.hero', 'You are a <b>Real Fan</b> when you want your content creators to get the highest cut.') ?></h4>
-				<a class="button button-primary" href="/signup"><?php l('home.register', 'Sign up') ?></a>
+				<a class="button button-primary" href="/login"><?php l('home.register', 'Sign up') ?></a>
 			</div>
 			<div class="one-half column phones">
 				<img class="phone" src="https://getskeleton.com/examples/landing/images/iphone.png">

public/login/index.php

@@ -2,7 +2,7 @@
 <?php
 
 $function      = null;
-$signup_method = null;
+$login_method = null;
 if (isset($_SERVER['REDIRECT_URL'])) {
 
 	# process URI
@@ -14,18 +14,18 @@ if (isset($_SERVER['REDIRECT_URL'])) {
 		die('Unexpected error');
 	}
 
-	# get the signup method from URL
+	# get the login method from URL
 	if (str_contains($args[1], ':')) {
 		$ps = explode(':', $args[1]);
-		$signup_method = $ps[0];
+		$login_method = $ps[0];
 		$function      = $ps[1];
 	} else {
-		$signup_method = $args[1];
+		$login_method = $args[1];
 		$function      = 'view';
 	}
 
-	if (!in_array($signup_method, ['mastodon'])) {
-		die('The given signup method does not exist');
+	if (!in_array($login_method, ['mastodon'])) {
+		die('The given login method does not exist');
 	}
 
 	if (!in_array($function, ['view', 'oauth'])) {
@@ -40,10 +40,10 @@ if ($function === 'oauth') {
 	$ID   = $_GET['id'] ?? '';
 	$code = $_GET['code'] ?? '';
 	if (empty($code) || empty($ID)) {
-		header('Location: /signup'); die;
+		header('Location: /login'); die;
 	}
 
-	switch ($signup_method) {
+	switch ($login_method) {
 		case 'mastodon':
 			require '/src/action/oauth/mastodon.php';
 			break;
@@ -55,7 +55,7 @@ if ($function === 'oauth') {
 <?php require '/src/views/public/head.php' ?>
 
 <main>
-SIGNUP: <?php echo $signup_method ?>
+LOGIN: <?php echo $login_method ?>
 <br>
 FUNCTION: <?php echo $function ?>
 </main>

src/action/oauth/mastodon.php

@@ -3,7 +3,7 @@
 
 $payload_fil = '/tmp/oauth-'.$ID;
 if (!file_exists($payload_fil)) {
-	header('Location: /signup'); die;
+	header('Location: /login'); die;
 }
 
 # get mastodon auth token

src/js/api.php

@@ -20,7 +20,7 @@ const http = {
 const API = {
 	mastodon: {
 		registerInstance: function(instance) {
-			http.get('/api/signup/mastodon/get_client.php?instance='+encodeURIComponent(instance), {}, function(data) 
+			http.get('/api/login/mastodon/get_client.php?instance='+encodeURIComponent(instance), {}, function(data) 
 			{
 				data = JSON.parse(data);
 				if (data.status === 'err') {