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206 lines
7.2 KiB
C
206 lines
7.2 KiB
C
// Copyright (c) 2020 Cesanta Software Limited
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// All rights reserved
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#include "mjson.h"
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#include "mongoose.h"
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// Authenticated user.
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// A user can be authenticated by:
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// - a name:pass pair
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// - a token
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// When a user is shown a login screen, she enters a user:pass. If successful,
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// a server returns user info which includes token. From that point on,
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// client can use token for authentication. Tokens could be refreshed/changed
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// on a server side, forcing clients to re-login.
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struct user {
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const char *name, *pass, *token;
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};
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// This is a configuration structure we're going to show on a dashboard
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static struct config {
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int value1;
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char *value2;
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} s_config = {123, NULL};
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// Stringifies the config. A caller must free() it.
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static char *stringify_config(struct config *cfg) {
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char *s = NULL;
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mjson_printf(mjson_print_dynamic_buf, &s, "{%Q:%d,%Q:%Q}", "value1",
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cfg->value1, "value2", cfg->value2);
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return s;
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}
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// Update config structure. Return true if changed, false otherwise
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static bool update_config(struct mg_http_message *hm, struct config *cfg) {
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bool changed = false;
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char buf[256];
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double dv;
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if (mjson_get_number(hm->body.ptr, hm->body.len, "$.value1", &dv)) {
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cfg->value1 = dv;
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changed = true;
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}
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if (mjson_get_string(hm->body.ptr, hm->body.len, "$.value2", buf,
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sizeof(buf)) > 0) {
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free(cfg->value2);
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cfg->value2 = strdup(buf);
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changed = true;
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}
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return changed;
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}
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// Parse HTTP requests, return authenticated user or NULL
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static struct user *getuser(struct mg_http_message *hm) {
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// In production, make passwords strong and tokens randomly generated
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// In this example, user list is kept in RAM. In production, it can
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// be backed by file, database, or some other method.
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static struct user users[] = {
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{"admin", "admin", "admin_token"},
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{"user1", "pass1", "user1_token"},
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{"user2", "pass2", "user2_token"},
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{NULL, NULL, NULL},
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};
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char user[256], pass[256];
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struct user *u;
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mg_http_creds(hm, user, sizeof(user), pass, sizeof(pass));
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if (user[0] != '\0' && pass[0] != '\0') {
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// Both user and password is set, search by user/password
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for (u = users; u->name != NULL; u++)
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if (strcmp(user, u->name) == 0 && strcmp(pass, u->pass) == 0) return u;
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} else if (user[0] == '\0') {
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// Only password is set, search by token
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for (u = users; u->name != NULL; u++)
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if (strcmp(pass, u->token) == 0) return u;
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}
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return NULL;
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}
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// Notify all config watchers about the config change
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static void notify_config_change(struct mg_mgr *mgr) {
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struct mg_connection *c;
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char *s = stringify_config(&s_config);
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for (c = mgr->conns; c != NULL; c = c->next) {
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if (c->label[0] == 'W') mg_http_printf_chunk(c, "%s\n", s);
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}
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free(s);
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}
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// HTTP request handler function
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static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
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if (ev == MG_EV_HTTP_MSG) {
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struct mg_http_message *hm = (struct mg_http_message *) ev_data;
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struct user *u = getuser(hm);
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// LOG(LL_INFO, ("%p [%.*s] auth %s", c->fd, (int) hm->uri.len, hm->uri.ptr,
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// u ? u->name : "NULL"));
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if (u == NULL && mg_http_match_uri(hm, "/api/#")) {
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// All URIs starting with /api/ must be authenticated
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mg_printf(c, "%s", "HTTP/1.1 403 Denied\r\nContent-Length: 0\r\n\r\n");
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} else if (mg_http_match_uri(hm, "/api/config/get")) {
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char *s = stringify_config(&s_config);
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mg_printf(c, "HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s\n",
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(int) strlen(s) + 1, s);
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free(s);
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} else if (mg_http_match_uri(hm, "/api/config/set")) {
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// Admins only
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if (strcmp(u->name, "admin") == 0) {
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if (update_config(hm, &s_config)) notify_config_change(fn_data);
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mg_printf(c, "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n");
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} else {
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mg_printf(c, "%s", "HTTP/1.1 403 Denied\r\nContent-Length: 0\r\n\r\n");
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}
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} else if (mg_http_match_uri(hm, "/api/config/watch")) {
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c->label[0] = 'W'; // Mark ourselves as a config watcher
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mg_printf(c, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
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} else if (mg_http_match_uri(hm, "/api/video1")) {
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c->label[0] = 'S'; // Mark that connection as live streamer
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mg_printf(
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c, "%s",
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"HTTP/1.0 200 OK\r\n"
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"Cache-Control: no-cache\r\n"
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"Pragma: no-cache\r\nExpires: Thu, 01 Dec 1994 16:00:00 GMT\r\n"
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"Content-Type: multipart/x-mixed-replace; boundary=--foo\r\n\r\n");
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} else if (mg_http_match_uri(hm, "/api/log/static")) {
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mg_http_serve_file(c, hm, "log.txt", "text/plain", "");
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} else if (mg_http_match_uri(hm, "/api/log/live")) {
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c->label[0] = 'L'; // Mark that connection as live log listener
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mg_printf(c, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
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} else if (mg_http_match_uri(hm, "/api/login")) {
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mg_printf(c, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");
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mg_http_printf_chunk(c, "{\"user\":\"%s\",\"token\":\"%s\"}\n", u->name,
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u->token);
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mg_http_printf_chunk(c, "");
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} else {
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struct mg_http_serve_opts opts = {0};
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opts.root_dir = "web_root";
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mg_http_serve_dir(c, ev_data, &opts);
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}
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}
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}
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// The image stream is simulated by sending MJPEG frames specified by the
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// "files" array of file names.
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static void broadcast_mjpeg_frame(struct mg_mgr *mgr) {
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const char *files[] = {"images/1.jpg", "images/2.jpg", "images/3.jpg",
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"images/4.jpg", "images/5.jpg", "images/6.jpg"};
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size_t nfiles = sizeof(files) / sizeof(files[0]);
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static size_t i;
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const char *path = files[i++ % nfiles];
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size_t size = 0;
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char *data = mg_file_read(path, &size); // Read next file
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struct mg_connection *c;
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for (c = mgr->conns; c != NULL; c = c->next) {
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if (c->label[0] != 'S') continue; // Skip non-stream connections
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if (data == NULL || size == 0) continue; // Skip on file read error
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mg_printf(c,
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"--foo\r\nContent-Type: image/jpeg\r\n"
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"Content-Length: %lu\r\n\r\n",
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(unsigned long) size);
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mg_send(c, data, size);
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mg_send(c, "\r\n", 2);
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}
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free(data);
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}
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static void mjpeg_cb(void *arg) {
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broadcast_mjpeg_frame(arg);
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}
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static void log_message(const char *filename, const char *message) {
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FILE *fp = fopen(filename, "a");
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if (fp != NULL) {
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fprintf(fp, "%s", message);
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fclose(fp);
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}
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}
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static void broadcast_message(struct mg_mgr *mgr, const char *message) {
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struct mg_connection *c;
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for (c = mgr->conns; c != NULL; c = c->next) {
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if (c->label[0] == 'L') mg_http_printf_chunk(c, "%s", message);
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}
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}
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// Timer function - called periodically.
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// Prepare log message. Save it to a file, and broadcast.
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static void log_cb(void *arg) {
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char buf[64];
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snprintf(buf, sizeof(buf), "Time is: %lu\n", (unsigned long) time(NULL));
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log_message("log.txt", buf);
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broadcast_message(arg, buf);
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}
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int main(void) {
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struct mg_mgr mgr;
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struct mg_timer t1, t2;
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mg_mgr_init(&mgr);
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mg_http_listen(&mgr, "http://localhost:8000", cb, &mgr);
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mg_timer_init(&t1, 500, MG_TIMER_REPEAT, mjpeg_cb, &mgr);
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mg_timer_init(&t2, 1000, MG_TIMER_REPEAT, log_cb, &mgr);
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for (;;) mg_mgr_poll(&mgr, 50);
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mg_timer_free(&t1);
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mg_timer_free(&t2);
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mg_mgr_free(&mgr);
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return 0;
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}
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