Fix origin and add email login note to login page

app/lib/express.js

@@ -223,9 +223,10 @@ router.get("/keys", (req, res) => {
 
 router.post("/keys/email", async (req, res) => {
   const email = req.body.email;
+  const origin = req.body.origin;
 
   let html = await ejs.renderFile("views/email_sign_in.ejs", {
-    host: `http://${req.headers.host}`,
+    origin,
     ssb_key: req.cookies["ssb_key"],
   });
 

app/views/email_sign_in.ejs

@@ -1,7 +1,7 @@
 <div style="font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; line-height: 1.3em; font-size: 16px; padding: 30px 0">
   <h1 style="font-weight: bold; line-height: 1.3em; margin: 0; padding: 10px 0 0 0; font-weight: 200;">Login button</h1>
   <p>Welcome to Social, please use the button below to login to your account:</p>
-  <form action="<%= host %>/login" method="POST" style="padding: 20px 0">
+  <form action="<%= origin %>/login" method="POST" style="padding: 20px 0">
     <input type="hidden" name="ssb_key" value="<%= ssb_key %>" />
     <input type="submit" value="Login to Social" style="background: #08d; color: #fff; border-radius: 3px; padding: 8px 10px; border: none; cursor: pointer; text-decoration: none; display: inline-block; padding: 16px 20px; font-size: 18px;">
   </form>

app/views/keys.ejs

@@ -16,8 +16,13 @@
     <form action="/keys/email" method="POST">
       <div style="padding: 20px 0 30px 0">
         <label>
+          <input type="hidden" name="origin" id="origin" />
+          <script>
+            const origin = document.querySelector("#origin");
+            origin.value = window.location.origin;
+          </script>
           Email: <br />
-          <input type="email" name="email">
+          <input type="email" name="email" />
         </label>
       </div>
       <input class="button-big" type="submit" value="Send">

app/views/login.ejs

@@ -3,6 +3,10 @@
 <div style="max-width: 800px; margin: 0 auto">
   <h1 style="padding-top: 50px">Login</h1>
 
+  <p style="padding-top: 15px">
+    You should probably have received your login button by email, search for "Social login button", if not, then you must have saved your key, you can input it here
+  </p>
+
   <form method="POST" action="/login" enctype="multipart/form-data">
     <div style="padding: 20px 0 10px 0">
       <label>