| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004-2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | /** @file server/actions.c |
| 21 | * @brief DisOrder web actions |
| 22 | * |
| 23 | * Actions are anything that the web interface does beyond passive template |
| 24 | * expansion and inspection of state recieved from the server. This means |
| 25 | * playing tracks, editing prefs etc but also setting extra headers e.g. to |
| 26 | * auto-refresh the playing list. |
| 27 | */ |
| 28 | |
| 29 | #include "disorder-cgi.h" |
| 30 | |
| 31 | /** @brief Redirect to some other action or URL */ |
| 32 | static void redirect(const char *url) { |
| 33 | /* By default use the 'back' argument */ |
| 34 | if(!url) |
| 35 | url = cgi_get("back"); |
| 36 | if(url) { |
| 37 | if(!strncmp(url, "http", 4)) |
| 38 | /* If the target is not a full URL assume it's the action */ |
| 39 | url = cgi_makeurl(config->url, "action", url, (char *)0); |
| 40 | } else { |
| 41 | /* If back= is not set just go back to the front page */ |
| 42 | url = config->url; |
| 43 | } |
| 44 | if(printf("Location: %s\n" |
| 45 | "%s\n" |
| 46 | "\n", url, dcgi_cookie_header()) < 0) |
| 47 | fatal(errno, "error writing to stdout"); |
| 48 | } |
| 49 | |
| 50 | /* 'playing' and 'manage' just add a Refresh: header */ |
| 51 | static void act_playing(void) { |
| 52 | long refresh = config->refresh; |
| 53 | long length; |
| 54 | time_t now, fin; |
| 55 | char *url; |
| 56 | const char *action; |
| 57 | |
| 58 | dcgi_lookup(DCGI_PLAYING|DCGI_QUEUE|DCGI_ENABLED|DCGI_RANDOM_ENABLED); |
| 59 | if(dcgi_playing |
| 60 | && dcgi_playing->state == playing_started /* i.e. not paused */ |
| 61 | && !disorder_length(dcgi_client, dcgi_playing->track, &length) |
| 62 | && length |
| 63 | && dcgi_playing->sofar >= 0) { |
| 64 | /* Try to put the next refresh at the start of the next track. */ |
| 65 | time(&now); |
| 66 | fin = now + length - dcgi_playing->sofar + config->gap; |
| 67 | if(now + refresh > fin) |
| 68 | refresh = fin - now; |
| 69 | } |
| 70 | if(dcgi_queue && dcgi_queue->state == playing_isscratch) { |
| 71 | /* next track is a scratch, don't leave more than the inter-track gap */ |
| 72 | if(refresh > config->gap) |
| 73 | refresh = config->gap; |
| 74 | } |
| 75 | if(!dcgi_playing |
| 76 | && ((dcgi_queue |
| 77 | && dcgi_queue->state != playing_random) |
| 78 | || dcgi_random_enabled) |
| 79 | && dcgi_enabled) { |
| 80 | /* no track playing but playing is enabled and there is something coming |
| 81 | * up, must be in a gap */ |
| 82 | if(refresh > config->gap) |
| 83 | refresh = config->gap; |
| 84 | } |
| 85 | if((action = cgi_get("action"))) |
| 86 | url = cgi_makeurl(config->url, "action", action, (char *)0); |
| 87 | else |
| 88 | url = config->url; |
| 89 | if(printf("Content-Type: text/html\n" |
| 90 | "Refresh: %ld;url=%s\n" |
| 91 | "%s\n" |
| 92 | "\n", |
| 93 | refresh, url, dcgi_cookie_header()) < 0) |
| 94 | fatal(errno, "error writing to stdout"); |
| 95 | dcgi_expand(action ? action : "playing"); |
| 96 | } |
| 97 | |
| 98 | static void act_disable(void) { |
| 99 | if(dcgi_client) |
| 100 | disorder_disable(dcgi_client); |
| 101 | redirect(0); |
| 102 | } |
| 103 | |
| 104 | static void act_enable(void) { |
| 105 | if(dcgi_client) |
| 106 | disorder_enable(dcgi_client); |
| 107 | redirect(0); |
| 108 | } |
| 109 | |
| 110 | static void act_random_disable(void) { |
| 111 | if(dcgi_client) |
| 112 | disorder_random_disable(dcgi_client); |
| 113 | redirect(0); |
| 114 | } |
| 115 | |
| 116 | static void act_random_enable(void) { |
| 117 | if(dcgi_client) |
| 118 | disorder_random_enable(dcgi_client); |
| 119 | redirect(0); |
| 120 | } |
| 121 | |
| 122 | /** @brief Table of actions */ |
| 123 | static const struct action { |
| 124 | /** @brief Action name */ |
| 125 | const char *name; |
| 126 | /** @brief Action handler */ |
| 127 | void (*handler)(void); |
| 128 | } actions[] = { |
| 129 | { "disable", act_disable }, |
| 130 | { "enable", act_enable }, |
| 131 | { "manage", act_playing }, |
| 132 | { "playing", act_playing }, |
| 133 | { "random-disable", act_random_disable }, |
| 134 | { "random-enable", act_random_enable }, |
| 135 | }; |
| 136 | |
| 137 | /** @brief Expand a template |
| 138 | * @param name Base name of template, or NULL to consult CGI args |
| 139 | */ |
| 140 | void dcgi_expand(const char *name) { |
| 141 | const char *p; |
| 142 | |
| 143 | /* For unknown actions check that they aren't evil */ |
| 144 | for(p = name; *p && isalnum((unsigned char)*p); ++p) |
| 145 | ; |
| 146 | if(*p) |
| 147 | fatal(0, "invalid action name '%s'", name); |
| 148 | byte_xasprintf((char **)&p, "%s.tmpl", name); |
| 149 | if(mx_expand_file(p, sink_stdio("stdout", stdout), 0) == -1 |
| 150 | || fflush(stdout) < 0) |
| 151 | fatal(errno, "error writing to stdout"); |
| 152 | } |
| 153 | |
| 154 | /** @brief Execute a web action |
| 155 | * @param action Action to perform, or NULL to consult CGI args |
| 156 | * |
| 157 | * If no recognized action is specified then 'playing' is assumed. |
| 158 | */ |
| 159 | void dcgi_action(const char *action) { |
| 160 | int n; |
| 161 | |
| 162 | /* Consult CGI args if caller had no view */ |
| 163 | if(!action) |
| 164 | action = cgi_get("action"); |
| 165 | /* Pick a default if nobody cares at all */ |
| 166 | if(!action) { |
| 167 | /* We allow URLs which are just c=... in order to keep confirmation URLs, |
| 168 | * which are user-facing, as short as possible. Actually we could lose the |
| 169 | * c= for this... */ |
| 170 | if(cgi_get("c")) |
| 171 | action = "confirm"; |
| 172 | else |
| 173 | action = "playing"; |
| 174 | /* Make sure 'action' is always set */ |
| 175 | cgi_set("action", action); |
| 176 | } |
| 177 | if((n = TABLE_FIND(actions, struct action, name, action)) >= 0) |
| 178 | /* Its a known action */ |
| 179 | actions[n].handler(); |
| 180 | else { |
| 181 | /* Just expand the template */ |
| 182 | if(printf("Content-Type: text/html\n" |
| 183 | "%s\n" |
| 184 | "\n", dcgi_cookie_header()) < 0) |
| 185 | fatal(errno, "error writing to stdout"); |
| 186 | dcgi_expand(action); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /** @brief Generate an error page */ |
| 191 | void dcgi_error(const char *msg, ...) { |
| 192 | va_list ap; |
| 193 | |
| 194 | va_start(ap, msg); |
| 195 | byte_xvasprintf(&dcgi_error_string, msg, ap); |
| 196 | va_end(ap); |
| 197 | dcgi_expand("error"); |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | Local Variables: |
| 202 | c-basic-offset:2 |
| 203 | comment-column:40 |
| 204 | fill-column:79 |
| 205 | indent-tabs-mode:nil |
| 206 | End: |
| 207 | */ |