chiark / gitweb /
split out dcgi_get_cookie
[disorder] / server / actions.c
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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 */
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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 */
bca4e2b7 28
1e97629d 29#include "disorder-cgi.h"
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30
31/** @brief Redirect to some other action or URL */
32static void redirect(const char *url) {
33 /* By default use the 'back' argument */
34 if(!url)
71634563 35 url = cgi_get("back");
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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"
1e97629d 46 "\n", url, dcgi_cookie_header()) < 0)
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47 fatal(errno, "error writing to stdout");
48}
49
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50/* 'playing' and 'manage' just add a Refresh: header */
51static void act_playing(void) {
52 long refresh = config->refresh;
53 long length;
54 time_t now, fin;
55 char *url;
71634563 56 const char *action;
448d3570 57
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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)
448d3570 62 && length
1e97629d 63 && dcgi_playing->sofar >= 0) {
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64 /* Try to put the next refresh at the start of the next track. */
65 time(&now);
1e97629d 66 fin = now + length - dcgi_playing->sofar + config->gap;
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67 if(now + refresh > fin)
68 refresh = fin - now;
69 }
1e97629d 70 if(dcgi_queue && dcgi_queue->state == playing_isscratch) {
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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 }
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75 if(!dcgi_playing
76 && ((dcgi_queue
77 && dcgi_queue->state != playing_random)
78 || dcgi_random_enabled)
79 && dcgi_enabled) {
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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"
5a7df048 91 "%s\n"
448d3570 92 "\n",
1e97629d 93 refresh, url, dcgi_cookie_header()) < 0)
448d3570 94 fatal(errno, "error writing to stdout");
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95 dcgi_expand(action ? action : "playing");
96}
97
98static void act_disable(void) {
99 if(dcgi_client)
100 disorder_disable(dcgi_client);
101 redirect(0);
102}
103
104static void act_enable(void) {
105 if(dcgi_client)
106 disorder_enable(dcgi_client);
107 redirect(0);
108}
109
110static void act_random_disable(void) {
111 if(dcgi_client)
112 disorder_random_disable(dcgi_client);
113 redirect(0);
114}
115
116static void act_random_enable(void) {
117 if(dcgi_client)
118 disorder_random_enable(dcgi_client);
119 redirect(0);
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120}
121
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122/** @brief Table of actions */
123static const struct action {
124 /** @brief Action name */
125 const char *name;
126 /** @brief Action handler */
127 void (*handler)(void);
128} actions[] = {
bca4e2b7 129 { "disable", act_disable },
bca4e2b7 130 { "enable", act_enable },
448d3570 131 { "manage", act_playing },
bca4e2b7 132 { "playing", act_playing },
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133 { "random-disable", act_random_disable },
134 { "random-enable", act_random_enable },
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135};
136
137/** @brief Expand a template
138 * @param name Base name of template, or NULL to consult CGI args
139 */
1e97629d 140void dcgi_expand(const char *name) {
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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)
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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
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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 */
1e97629d 159void dcgi_action(const char *action) {
bca4e2b7 160 int n;
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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";
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174 /* Make sure 'action' is always set */
175 cgi_set("action", action);
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176 }
177 if((n = TABLE_FIND(actions, struct action, name, action)) >= 0)
178 /* Its a known action */
179 actions[n].handler();
448d3570 180 else {
bca4e2b7 181 /* Just expand the template */
448d3570 182 if(printf("Content-Type: text/html\n"
5a7df048 183 "%s\n"
1e97629d 184 "\n", dcgi_cookie_header()) < 0)
448d3570 185 fatal(errno, "error writing to stdout");
1e97629d 186 dcgi_expand(action);
448d3570 187 }
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188}
189
190/** @brief Generate an error page */
1e97629d 191void dcgi_error(const char *msg, ...) {
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192 va_list ap;
193
194 va_start(ap, msg);
1e97629d 195 byte_xvasprintf(&dcgi_error_string, msg, ap);
bca4e2b7 196 va_end(ap);
1e97629d 197 dcgi_expand("error");
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198}
199
200/*
201Local Variables:
202c-basic-offset:2
203comment-column:40
204fill-column:79
205indent-tabs-mode:nil
206End:
207*/