cgi.c - frontends - front-ends for some sites (experiment)
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cgi.c (10345B)
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1 #include <sys/socket.h>
2 #include <sys/types.h>
3
4 #include <ctype.h>
5 #include <errno.h>
6 #include <netdb.h>
7 #include <stdarg.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <unistd.h>
12
13 #include "https.h"
14 #include "util.h"
15 #include "youtube.h"
16
17 #define OUT(s) (fputs((s), stdout))
18
19 extern char **environ;
20
21 /* page title */
22 char title[1024];
23
24 /* CGI parameters */
25 static char rawsearch[4096], search[4096], order[16], page[64];
26 static char videoid[256];
27 static char channelid[256], userid[256];
28
29 /* Escape characters below as HTML 2.0 / XML 1.0.
30 Translate multi-line to <br/> */
31 void
32 xmlencode_multiline(const char *s)
33 {
34 for (; *s; s++) {
35 switch(*s) {
36 case '<': fputs("<", stdout); break;
37 case '>': fputs(">", stdout); break;
38 case '\'': fputs("'", stdout); break;
39 case '&': fputs("&", stdout); break;
40 case '"': fputs(""", stdout); break;
41 case '\n': fputs("<br/>", stdout); break;
42 default: putchar(*s);
43 }
44 }
45 }
46
47 void
48 parsecgi(void)
49 {
50 char *query, *p;
51 size_t len;
52
53 if (!(query = getenv("QUERY_STRING")))
54 query = "";
55
56 /* order */
57 if ((p = getparam(query, "o"))) {
58 if (decodeparam(order, sizeof(order), p) == -1 ||
59 (strcmp(order, "date") &&
60 strcmp(order, "relevance") &&
61 strcmp(order, "views") &&
62 strcmp(order, "rating")))
63 order[0] = '\0';
64 }
65 if (!order[0])
66 snprintf(order, sizeof(order), "relevance");
67
68 /* search */
69 if ((p = getparam(query, "q"))) {
70 if ((len = strcspn(p, "&")) && len + 1 < sizeof(rawsearch)) {
71 memcpy(rawsearch, p, len);
72 rawsearch[len] = '\0';
73 }
74
75 if (decodeparam(search, sizeof(search), p) == -1) {
76 OUT("Status: 401 Bad Request\r\n\r\n");
77 exit(1);
78 }
79 }
80
81 /* channel ID */
82 if ((p = getparam(query, "chan"))) {
83 if (decodeparam(channelid, sizeof(channelid), p) == -1)
84 channelid[0] = '\0';
85 }
86
87 /* user ID */
88 if ((p = getparam(query, "user"))) {
89 if (decodeparam(userid, sizeof(userid), p) == -1)
90 userid[0] = '\0';
91 }
92
93 /* video ID */
94 if ((p = getparam(query, "v"))) {
95 if (decodeparam(videoid, sizeof(videoid), p) == -1)
96 videoid[0] = '\0';
97 }
98 }
99
100 void
101 header(void)
102 {
103 OUT(
104 "Content-Type: text/html; charset=utf-8\r\n\r\n"
105 "<!DOCTYPE html>\n<html>\n<head>\n"
106 "<meta name=\"referrer\" content=\"no-referrer\" />\n"
107 "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n");
108
109 if (title[0]) {
110 OUT("<title>");
111 xmlencode(title);
112 OUT("</title>");
113 }
114
115 OUT(
116 "<link rel=\"stylesheet\" href=\"css/style.css\" type=\"text/css\" media=\"screen\" />\n"
117 "<link rel=\"icon\" type=\"image/png\" href=\"/favicon.png\" />\n"
118 "<meta content=\"width=device-width\" name=\"viewport\" />\n"
119 "</head>\n"
120 "<body class=\"search\">\n"
121 "<form method=\"get\" action=\"\">\n");
122
123 OUT(
124 "<table class=\"search\" width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n"
125 "<tr>\n"
126 " <td width=\"100%\" class=\"input\">\n"
127 " <input type=\"search\" name=\"q\" value=\"");
128 xmlencode(search);
129 OUT(
130 "\" placeholder=\"Search...\" size=\"72\" autofocus=\"autofocus\" class=\"search\" accesskey=\"f\" />\n"
131 " </td>\n"
132 " <td nowrap class=\"nowrap\">\n"
133 " <input type=\"submit\" value=\"Search\" class=\"button\"/>\n"
134 " <select name=\"o\" title=\"Order by\" accesskey=\"o\">\n");
135 printf(" <option value=\"date\"%s>Creation date</option>\n", !strcmp(order, "date") ? " selected=\"selected\"" : "");
136 printf(" <option value=\"relevance\"%s>Relevance</option>\n", !strcmp(order, "relevance") ? " selected=\"selected\"" : "");
137 printf(" <option value=\"views\"%s>Views</option>\n", !strcmp(order, "views") ? " selected=\"selected\"" : "");
138 printf(" <option value=\"rating\"%s>Rating</option>\n", !strcmp(order, "rating") ? " selected=\"selected\"" : "");
139 OUT(
140 " </select>\n"
141 " </td>\n"
142 "</tr>\n"
143 "</table>\n"
144 "</form>\n");
145 }
146
147 void
148 footer(void)
149 {
150 OUT("</body>\n</html>\n");
151 }
152
153 int
154 render_search(struct search_response *r)
155 {
156 struct item *v;
157 int n;
158 size_t i;
159
160 if (pledge("stdio", NULL) == -1) {
161 OUT("Status: 500 Internal Server Error\r\n\r\n");
162 exit(1);
163 }
164
165 n = -1;
166 if (search[0])
167 n = snprintf(title, sizeof(title), "Search: \"%s\" sorted by %s", search, order);
168 else if (channelid[0])
169 n = snprintf(title, sizeof(title), "Channel videos: %s", channelid);
170 else if (userid[0])
171 n = snprintf(title, sizeof(title), "User videos: %s", userid);
172 if (n < 0 || n >= sizeof(title))
173 title[0] = '\0';
174
175 header();
176
177 if (r && r->nitems) {
178 OUT(
179 "<hr/>\n"
180 "<table class=\"videos\" width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n"
181 "<tbody>\n");
182
183 for (i = 0; i < r->nitems; i++) {
184 v = &(r->items[i]);
185
186 OUT("<tr class=\"v\">\n"
187 " <td class=\"thumb\" width=\"120\" align=\"center\">\n");
188
189 if (v->id[0]) {
190 OUT(" <a href=\"https://www.youtube.com/embed/");
191 xmlencode(v->id);
192 OUT("\"><img src=\"https://i.ytimg.com/vi/");
193 xmlencode(v->id);
194 OUT("/default.jpg\" alt=\"\" height=\"90\" border=\"0\" /></a>\n");
195 } else {
196 /* placeholder image */
197 OUT(" <img src=\"https://i.ytimg.com/vi/\" alt=\"\" height=\"90\" border=\"0\" />\n");
198 }
199 OUT(" </td>\n"
200 " <td>\n"
201 " <span class=\"title\">");
202
203 if (v->id[0]) {
204 OUT("<a href=\"https://www.youtube.com/embed/");
205 xmlencode(v->id);
206 printf("\" accesskey=\"%zu\"", i);
207 /* if (v->shortdescription[0]) {
208 OUT(" title=\"");
209 xmlencode(v->shortdescription);
210 OUT("\"");
211 }*/
212 OUT(">");
213 }
214
215 switch (v->linktype) {
216 case Channel:
217 OUT("[Channel] ");
218 xmlencode(v->channeltitle);
219 break;
220 case Movie:
221 OUT("[Movie] ");
222 xmlencode(v->title);
223 break;
224 case Playlist:
225 OUT("[Playlist] ");
226 xmlencode(v->title);
227 break;
228 default:
229 xmlencode(v->title);
230 break;
231 }
232
233 if (v->id[0])
234 OUT("</a>");
235
236 /* link to video information */
237 if (v->id[0]) {
238 OUT(" | <a href=\"?v=");
239 xmlencode(v->id);
240 OUT("\" title=\"More video details\">Details</a>");
241 }
242
243 OUT(
244 "</span><br/>\n"
245 "\t\t<span class=\"channel\">");
246
247 if (v->channelid[0]) {
248 OUT("<a href=\"?chan=");
249 xmlencode(v->channelid);
250 OUT("\">");
251 xmlencode(v->channeltitle);
252 OUT("</a>");
253 } else if (v->userid[0]) {
254 OUT("<a href=\"?user=");
255 xmlencode(v->channelid);
256 OUT("\">");
257 xmlencode(v->channeltitle);
258 OUT("</a>");
259 } else {
260 xmlencode(v->channeltitle);
261 }
262
263 if (v->channelid[0] || v->userid[0]) {
264 OUT(" | <a title=\"");
265 xmlencode(v->channeltitle);
266 OUT(" Atom feed\" href=\"https://www.youtube.com/feeds/videos.xml?");
267 if (v->channelid[0]) {
268 OUT("channel_id=");
269 xmlencode(v->channelid);
270 } else if (v->userid[0]) {
271 OUT("user=");
272 xmlencode(v->userid);
273 }
274 OUT("\">Atom feed</a>");
275 }
276
277 OUT("</span><br/>\n");
278 if (v->publishedat[0]) {
279 OUT(" <span class=\"publishedat\">Published: ");
280 OUT(v->publishedat);
281 OUT("</span><br/>\n");
282 }
283 OUT(" <span class=\"stats\">");
284 if (v->viewcount[0]) {
285 printnumsep(v->viewcount);
286 OUT(" views");
287 }
288 OUT(
289 "</span><br/>\n"
290 " </td>\n"
291 " <td align=\"right\" class=\"a-r\">\n"
292 " <span class=\"duration\">");
293 OUT(v->duration);
294 OUT(
295 "</span>\n"
296 " </td>\n"
297 "</tr>\n"
298 "<tr class=\"hr\">\n"
299 " <td colspan=\"3\"><hr/></td>\n"
300 "</tr>\n");
301 }
302 OUT("</tbody>\n</table>\n");
303 }
304
305 footer();
306
307 return 0;
308 }
309
310 int
311 render_video(struct video_response *r)
312 {
313 char buf[256];
314 int n;
315
316 if (pledge("stdio", NULL) == -1) {
317 OUT("Status: 500 Internal Server Error\r\n\r\n");
318 exit(1);
319 }
320
321 n = snprintf(title, sizeof(title), "%s - %s", r->title, r->author);
322 if (n < 0 || n >= sizeof(title))
323 title[0] = '\0';
324
325 header();
326
327 OUT("<hr/>\n");
328
329 OUT("<table class=\"video\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n");
330 OUT("<tbody>\n");
331
332 OUT("<tr><td colspan=\"2\"><center>\n");
333 OUT("<a href=\"https://www.youtube.com/embed/");
334 xmlencode(r->id);
335 OUT("\"><img src=\"https://i.ytimg.com/vi/");
336 xmlencode(r->id);
337 OUT("/hqdefault.jpg\" alt=\"\" border=\"0\" /></a>\n");
338 OUT("</center><br/></td></tr>\n");
339
340 OUT("<tr><td><b>Title:</b></td><td>");
341 OUT("<a href=\"https://www.youtube.com/embed/");
342 xmlencode(r->id);
343 OUT("\">");
344 xmlencode(r->title);
345 OUT("</a></td></tr>\n");
346
347 if (r->lengthseconds > 0) {
348 OUT("<tr><td><b>Length:</b></td><td>");
349 if (durationstr(r->lengthseconds, buf, sizeof(buf)) < sizeof(buf))
350 xmlencode(buf);
351 OUT("</td></tr>\n");
352 }
353
354 if (r->author[0]) {
355 OUT("<tr><td><b>Channel:</b></td><td>");
356 if (r->channelid[0]) {
357 OUT("<a href=\"?chan=");
358 xmlencode(r->channelid);
359 OUT("\">");
360 xmlencode(r->author);
361 OUT("</a>");
362 OUT(": <a href=\"https://www.youtube.com/feeds/videos.xml?channel_id=");
363 xmlencode(r->channelid);
364 OUT("\">Atom feed</a>");
365 } else {
366 xmlencode(r->author);
367 }
368 OUT("</td></tr>\n");
369 }
370
371 OUT("<tr><td><b>Views:</b></td><td>");
372 snprintf(buf, sizeof(buf), "%ld", r->viewcount);
373 printnumsep(buf);
374 OUT("</td></tr>\n");
375
376 if (r->publishdate[0]) {
377 OUT("<tr><td><b>Published:</b></td><td>");
378 xmlencode(r->publishdate);
379 OUT("</td></tr>\n");
380 }
381
382 if (r->uploaddate[0]) {
383 OUT("<tr><td><b>Uploaded:</b></td><td>");
384 xmlencode(r->uploaddate);
385 OUT("</td></tr>\n");
386 }
387
388 if (r->shortdescription[0]) {
389 OUT("<tr><td valign=\"top\"><b>Description: </b></td><td><code>");
390 xmlencode_multiline(r->shortdescription);
391 OUT("</code></td></tr>\n");
392 }
393
394 OUT("</tbody>\n");
395 OUT("</table>\n");
396
397 footer();
398
399 return 0;
400 }
401
402 int
403 main(void)
404 {
405 struct search_response *r = NULL;
406 struct video_response *vr = NULL;
407
408 if (pledge("stdio dns inet rpath unveil", NULL) == -1 ||
409 unveil(TLS_CA_CERT_FILE, "r") == -1 ||
410 unveil(NULL, NULL) == -1) {
411 OUT("Status: 500 Internal Server Error\r\n\r\n");
412 exit(1);
413 }
414
415 parsecgi();
416
417 if (rawsearch[0]) {
418 r = youtube_search(rawsearch, page, order);
419 } else if (channelid[0]) {
420 r = youtube_channel_videos(channelid);
421 } else if (userid[0]) {
422 r = youtube_user_videos(userid);
423 } else if (videoid[0]) {
424 vr = youtube_video(videoid);
425 if (!vr || vr->isfound == 0) {
426 OUT("Status: 500 Internal Server Error\r\n\r\n");
427 exit(1);
428 }
429 render_video(vr);
430 return 0;
431 } else {
432 goto show;
433 }
434 if (!r || r->nitems == 0) {
435 OUT("Status: 500 Internal Server Error\r\n\r\n");
436 exit(1);
437 }
438
439 show:
440 render_search(r);
441
442 return 0;
443 }