Added web UI login example

examples/webui-login/Makefile

@@ -0,0 +1,20 @@
+PROG ?= example
+SSL = ?
+
+ifeq "$(SSL)" "MBEDTLS"
+CFLAGS += -DMG_ENABLE_MBEDTLS=1 -lmbedtls -lmbedcrypto -lmbedx509
+endif
+
+ifeq "$(SSL)" "OPENSSL"
+CFLAGS += -DMG_ENABLE_OPENSSL=1 -lssl -lcrypto
+endif
+
+all: $(PROG)
+	$(DEBUGGER) ./$(PROG) $(ARGS)
+
+
+$(PROG): main.c
+	$(CC) ../../mongoose.c -I../.. -W -Wall $(CFLAGS) $(EXTRA_CFLAGS) -o $(PROG) main.c
+
+clean:
+	rm -rf $(PROG) *.o *.dSYM *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb

examples/webui-login/main.c

@@ -0,0 +1,75 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+const char *s_listening_url = "http://0.0.0.0:8000";
+
+// Authenticated user.
+// A user can be authenticated by:
+//   - a name:pass pair
+//   - a token
+// When a user is shown a login screen, they enter a user:pass. If successful,
+// the server returns the user info, which includes the token. From that point
+// on, the client can use the token for authentication. Tokens could be
+// refreshed/changed at server side, forcing clients to re-login.
+struct user {
+  const char *name, *pass, *token;
+};
+
+// Parse HTTP requests, return authenticated user or NULL
+static struct user *getuser(struct mg_http_message *hm) {
+  // In production, make passwords strong and tokens randomly generated
+  // In this example, user list is kept in RAM. In production, it can
+  // be backed by file, database, or some other method.
+  static struct user users[] = {
+      {"admin", "pass0", "admin_token"},
+      {"user1", "pass1", "user1_token"},
+      {"user2", "pass2", "user2_token"},
+      {NULL, NULL, NULL},
+  };
+  char user[256], pass[256];
+  struct user *u;
+  mg_http_creds(hm, user, sizeof(user), pass, sizeof(pass));
+  if (user[0] != '\0' && pass[0] != '\0') {
+    // Both user and password are set, search by user/password
+    for (u = users; u->name != NULL; u++)
+      if (strcmp(user, u->name) == 0 && strcmp(pass, u->pass) == 0) return u;
+  } else if (user[0] == '\0') {
+    // Only password is set, search by token
+    for (u = users; u->name != NULL; u++)
+      if (strcmp(pass, u->token) == 0) return u;
+  }
+  return NULL;
+}
+
+void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    struct user *u = getuser(hm);
+    if (u == NULL && mg_http_match_uri(hm, "/api/#")) {
+      // All URIs starting with /api/ must be authenticated
+      mg_printf(c, "%s", "HTTP/1.1 403 Denied\r\nContent-Length: 0\r\n\r\n");
+    } else if (mg_http_match_uri(hm, "/api/data")) {
+      mg_http_reply(c, 200, "Content-Type: application/json\r\n",
+                    "{%Q:%Q,%Q:%Q}\n", "text", "Hello!", "data", "somedata");
+    } else if (mg_http_match_uri(hm, "/api/login")) {
+      mg_http_reply(c, 200, "Content-Type: application/json\r\n",
+                    "{%Q:%Q,%Q:%Q}\n", "user", u->name, "token", u->token);
+    } else {
+      struct mg_http_serve_opts opts = {.root_dir = "web_root"};
+      mg_http_serve_dir(c, ev_data, &opts);
+    }
+  }
+  (void) fn_data;
+}
+
+int main(void) {
+  struct mg_mgr mgr;
+  mg_log_set("2");  // Set to 3 for debug, to 4 for very verbose level
+  mg_mgr_init(&mgr);
+  mg_http_listen(&mgr, s_listening_url, fn, &mgr);
+  while (mgr.conns != NULL) mg_mgr_poll(&mgr, 500);
+  mg_mgr_free(&mgr);
+  return 0;
+}

examples/webui-login/web_root/index.html

@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <link rel="stylesheet" href="style.css" />
+  </head>
+  <body></body>
+  <script type="module" src="main.js"></script>
+</html>

examples/webui-login/web_root/main.js

@@ -0,0 +1,98 @@
+'use strict';
+import { h, html, render, useEffect, useState } from './preact.min.js';
+
+const Nav = props => html`
+<div style="background: #333; padding: 0.5em; color: #fff;">
+  <div class="container d-flex">
+    <div style="flex: 1 1 auto; display: flex; align-items: center;">
+      <b>Your Product</b>
+    </div>
+    <div style="display: flex; align-items: center; flex: 0 0 auto; ">
+      <span>Logged in as:</span>
+      <span style="padding: 0 0.5em;"><img src="user.png" height="22" /></span>
+      <span>${props.user}</span>
+      <a class="btn" onclick=${props.logout}
+        style="margin-left: 1em; font-size: 0.8em; background: #8aa;">logout</a>
+    </div>
+  </div>
+</div>`;
+
+const Main = props => html`
+<div class="row">
+  <H1>${props.data.text}</H1>
+</div>`;
+
+const Login = function (props) {
+  const [user, setUser] = useState('');
+  const [pass, setPass] = useState('');
+  const login = () =>
+    fetch(
+      '/api/login',
+      { headers: { Authorization: 'Basic ' + btoa(user + ':' + pass) } })
+      .then(r => r.json())
+      .then(r => r && props.login(r))
+      .catch(err => err);
+  return html`
+<div class="rounded border" style="max-width: 480px; margin: 0 auto; margin-top: 5em; background: #eee; ">
+  <div style="padding: 2em; ">
+    <h1 style="color: #666;">Your Product Login </h1>
+    <div style="margin: 0.5em 0;">
+      <input type='text' placeholder='Name' style="width: 100%;"
+        oninput=${ev => setUser(ev.target.value)} value=${user} />
+    </div>
+    <div style="margin: 0.5em 0;">
+      <input type="password" placeholder="Password" style="width: 100%;"
+        oninput=${ev => setPass(ev.target.value)} value=${pass}
+        onchange=${login} />
+    </div>
+    <div style="margin: 1em 0;">
+      <button class="btn" style="width: 100%; background: #8aa;"
+        disabled=${!user || !pass} onclick=${login}> Login </button>
+    </div>
+    <div style="color: #777; margin-top: 2em;">
+      Valid logins: admin:pass0, user1:pass1, user2:pass2
+    </div>
+  </div>
+</div>`;
+};
+
+
+
+const App = function () {
+  const [user, setUser] = useState('');
+  const [data, setData] = useState({});
+
+  const getin = () =>
+    fetch('/api/data', { headers: { Authorization: '' } })
+      .then(r => r.json())
+      .then(r => setData(r))
+      .catch(err => console.log(err));
+
+  const login = function (u) {
+    document.cookie = `access_token=${u.token};path=/;max-age=3600`;
+    setUser(u.user);
+    return getin();
+  };
+
+  const logout = () => {
+    document.cookie = `access_token=;path=/;max-age=0`;
+    setUser('');
+  };
+
+  useEffect(() => {
+    // Called once at init time
+    fetch('/api/login', { headers: { Authorization: '' } })
+      .then(r => r.json())
+      .then(r => login(r))
+      .catch(() => setUser(''));
+  }, []);
+
+  if (!user) return html`<${Login} login=${login} />`;
+
+  return html`
+<${Nav} user=${user} logout=${logout} />
+<${Main} data=${data} />
+`;
+};
+
+window.onload = () => render(h(App), document.body);

examples/webui-login/web_root/preact.min.js

@@ -0,0 +1 @@
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examples/webui-login/web_root/style.css

@@ -0,0 +1,43 @@
+* { box-sizing: border-box; }
+html, body { margin: 0; padding: 0; height: 100%; font: 16px sans-serif; }
+select, input, label::before, textarea { outline: none; box-shadow:none !important; border: 1px solid #ccc !important; }
+code, pre { color: #373; font-family: monospace; font-weight: bolder; font-size: smaller; background: #ddd; padding: 0.1em 0.3em; border-radius: 0.2em; }
+textarea, input, .addon { font-size: 15px; border: 1px solid #ccc; padding: 0.5em; }
+a, a:visited, a:active { color: #55f; }
+.addon { background: #eee;  min-width: 9em;}
+.btn {
+  background: #ccc; border-radius: 0.3em; border: 0; color: #fff; cursor: pointer;
+  display: inline-block; padding: 0.6em 2em; font-weight: bolder;
+}
+.btn[disabled] { opacity: 0.5; cursor: auto;}
+.smooth { transition: all .2s; }
+.container { margin: 0 20px; width: auto; }
+.d-flex { display: flex; }
+.d-none { display: none; }
+.border { border: 1px solid #ddd; }
+.rounded { border-radius: 0.5em; }
+.nowrap { white-space: nowrap; }
+.msg { background: #def; border-left: 5px solid #59d; padding: 0.5em; font-size: 90%; margin: 1em 0; }
+.section { margin: 0 1em; }
+.topic, .data, .qos {  padding: 0.2em 0.5em; border-radius: 0.4em; margin-right: 0.5em;  }
+.qos { background: #efa; }
+.topic { background: #fea; }
+.data { background: #aef; }
+
+/* Grid */
+.row { display: flex; flex-wrap: wrap; }
+.col { margin: 0; padding: 0; overflow: auto; }
+.col-12 { width: 100%; }
+.col-11 { width: 91.66%; }
+.col-10 { width: 83.33%; }
+.col-9 { width: 75%; }
+.col-8 { width: 66.66%; }
+.col-7 { width: 58.33%; }
+.col-6 { width: 50%; }
+.col-5 { width: 41.66%; }
+.col-4 { width: 33.33%; }
+.col-3 { width: 25%; }
+.col-2 { width: 16.66%; }
+.col-1 { width: 8.33%; }
+@media (min-width: 1310px) { .container { margin: auto; width: 1270px; } }
+@media (max-width: 920px) { .row .col { width: 100%; } }