1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #ifndef TELESCOPE_H
18 #define TELESCOPE_H
19 
20 #include "cmd.h"
21 #include "compat.h"
22 #include "phos/phos.h"
23 
24 #include <event.h>
25 
26 #define MIN(a, b) ((a) < (b) ? (a) : (b))
27 #define MAX(a, b) ((a) > (b) ? (a) : (b))
28 
29 #define GEMINI_URL_LEN 1024
30 
31 enum imsg_type {
32 	/* ui <-> client/fs */
33 	IMSG_GET,		/* data is URL, peerid the tab id */
34 	IMSG_ERR,
35 	IMSG_CHECK_CERT,
36 	IMSG_CERT_STATUS,
37 	IMSG_GOT_CODE,
38 	IMSG_GOT_META,
39 	IMSG_PROCEED,
40 	IMSG_STOP,
41 	IMSG_BUF,
42 	IMSG_EOF,
43 	IMSG_QUIT,
44 
45 	/* ui <-> fs */
46 	IMSG_BOOKMARK_PAGE,
47 	IMSG_BOOKMARK_OK,
48 	IMSG_SAVE_CERT,
49 	IMSG_SAVE_CERT_OK,
50 	IMSG_UPDATE_CERT,
51 	IMSG_UPDATE_CERT_OK,
52 
53 	IMSG_FILE_OPEN,
54 	IMSG_FILE_OPENED,
55 
56 	IMSG_SESSION_START,
57 	IMSG_SESSION_TAB,
58 	IMSG_SESSION_END,
59 };
60 
61 struct lineprefix {
62 	const char	*prfx1;
63 	const char	*prfx2;
64 };
65 extern struct lineprefix line_prefixes[];
66 
67 struct line_face {
68 	int prefix_prop;
69 	int text_prop;
70 };
71 extern struct line_face line_faces[];
72 
73 struct tab_face  {
74 	int background, tab, current_tab;
75 };
76 extern struct tab_face tab_face;
77 
78 struct modeline_face {
79 	int background;
80 };
81 extern struct modeline_face modeline_face;
82 
83 struct minibuffer_face {
84 	int background;
85 };
86 extern struct minibuffer_face minibuffer_face;
87 
88 enum line_type {
89 	LINE_TEXT,
90 	LINE_LINK,
91 	LINE_TITLE_1,
92 	LINE_TITLE_2,
93 	LINE_TITLE_3,
94 	LINE_ITEM,
95 	LINE_QUOTE,
96 	LINE_PRE_START,
97 	LINE_PRE_CONTENT,
98 	LINE_PRE_END,
99 };
100 
101 struct line {
102 	enum line_type		 type;
103 	char			*line;
104 	char			*alt;
105 	int			 flags;
106 	TAILQ_ENTRY(line)	 lines;
107 };
108 
109 struct vline {
110 	const struct line	*parent;
111 	char			*line;
112 	int			 flags;
113 	TAILQ_ENTRY(vline)	 vlines;
114 };
115 
116 struct parser;
117 struct page;
118 
119 typedef int	(*parsechunkfn)(struct parser*, const char*, size_t);
120 typedef int	(*parserfreefn)(struct parser*);
121 
122 typedef void (imsg_handlerfn)(struct imsg*, size_t);
123 
124 struct parser {
125 	const char	*name;
126 	char		 title[32+1];
127 	char		*buf;
128 	size_t		 len;
129 	size_t		 cap;
130 	int		 flags;
131 	parsechunkfn	 parse;
132 	parserfreefn	 free;
133 
134 	TAILQ_HEAD(, line)	 head;
135 };
136 
137 /*
138  * differnt types of trust for a certificate.  Following
139  * gemini://thfr.info/gemini/modified-trust-verify.gmi
140  */
141 enum trust_state {
142 	TS_UNKNOWN,
143 	TS_UNTRUSTED,
144 	TS_TRUSTED,
145 	TS_VERIFIED,
146 };
147 
148 struct tofu_entry {
149 	char	domain[GEMINI_URL_LEN];
150 
151 	/*
152 	 * enough space for ``PROTO:HASH''.  probably isn't a good
153 	 * idea tho.
154 	 */
155 	char	hash[128+1];
156 	int	verified;
157 };
158 
159 struct histhead {
160 	TAILQ_HEAD(mhisthead, hist)	head;
161 	size_t				len;
162 };
163 struct hist {
164 	char			h[1025];
165 	TAILQ_ENTRY(hist)	entries;
166 };
167 
168 struct buffer {
169 	struct parser		 page;
170 	int			 curs_x;
171 	int			 curs_y;
172 	size_t			 line_off;
173 	size_t			 line_max;
174 	struct vline		*current_line;
175 	size_t			 cpoff;
176 	TAILQ_HEAD(vhead, vline) head;
177 };
178 
179 extern TAILQ_HEAD(tabshead, tab) tabshead;
180 struct tab {
181 	TAILQ_ENTRY(tab)	 tabs;
182 	uint32_t		 id;
183 	uint32_t		 flags;
184 
185 	char			*cert;
186 	enum trust_state	 trust;
187 	struct phos_uri		 uri;
188 	struct histhead		 hist;
189 	struct hist		*hist_cur;
190 	size_t			 hist_off;
191 
192 	int			 code;
193 	char			 meta[GEMINI_URL_LEN];
194 	int			 redirect_count;
195 
196 	struct buffer		 buffer;
197 
198 	short			 loading_anim;
199 	short			 loading_anim_step;
200 	struct event		 loadingev;
201 
202 	int			 fd;
203 	size_t			 bytes;
204 	char			*path;
205 };
206 
207 struct proto {
208 	const char	*schema;
209 
210 	/*
211 	 * should load the given url in the tab.  Optionally, it may
212 	 * consider the given url as relative to the one already
213 	 * present in tab.  It must set tab->urlstr to a serialized
214 	 * human-friendly URL.
215 	 */
216 	void		 (*loadfn)(struct tab*, const char*);
217 };
218 
219 struct kmap {
220 	TAILQ_HEAD(map, keymap)	m;
221 	void			(*unhandled_input)(void);
222 };
223 
224 struct keymap {
225 	int			 meta;
226 	int			 key;
227 	struct kmap		 map;
228 	void			(*fn)(struct buffer*);
229 
230 	TAILQ_ENTRY(keymap)	 keymaps;
231 };
232 
233 /* fs.c */
234 int		 fs_init(void);
235 int		 fs_main(struct imsgbuf*);
236 int		 load_certs(struct ohash*);
237 int		 load_last_session(void(*)(const char*));
238 
239 /* gemini.c */
240 int		 client_main(struct imsgbuf*);
241 
242 /* gemtext.c */
243 void		 gemtext_initparser(struct parser*);
244 
245 /* hist.c */
246 void		 hist_clear_forward(struct histhead*, struct hist*);
247 void		 hist_push(struct histhead*, struct hist*);
248 
249 /* keymap.c */
250 int		 kbd(const char*);
251 const char	*unkbd(int);
252 int		 kmap_define_key(struct kmap*, const char*, void(*)(struct buffer*));
253 
254 /* mime.c */
255 int		 setup_parser_for(struct tab*);
256 
257 /* pages.c */
258 extern const char	*about_new;
259 
260 #define CANNOT_FETCH		0
261 #define TOO_MUCH_REDIRECTS	1
262 #define MALFORMED_RESPONSE	2
263 #define UNKNOWN_TYPE_OR_CSET	3
264 extern const char	*err_pages[70];
265 
266 /* parse.y */
267 void		 parseconfig(const char *, int);
268 
269 /* parser.c */
270 int		 parser_append(struct parser*, const char*, size_t);
271 int		 parser_set_buf(struct parser*, const char*, size_t);
272 int		 parser_foreach_line(struct parser*, const char*, size_t, parsechunkfn);
273 
274 /* sandbox.c */
275 void		 sandbox_network_process(void);
276 void		 sandbox_ui_process(void);
277 void		 sandbox_fs_process(void);
278 
279 /* telescope.c */
280 void		 load_about_url(struct tab*, const char*);
281 void		 load_gemini_url(struct tab*, const char*);
282 void		 load_url(struct tab*, const char*);
283 int		 load_previous_page(struct tab*);
284 int		 load_next_page(struct tab*);
285 void		 stop_tab(struct tab*);
286 void		 add_to_bookmarks(const char*);
287 void		 save_session(void);
288 
289 /* textplain.c */
290 void		 textplain_initparser(struct parser*);
291 
292 /* tofu.c */
293 void			 tofu_init(struct ohash*, unsigned int, ptrdiff_t);
294 struct tofu_entry	*tofu_lookup(struct ohash*, const char*, const char*);
295 void			 tofu_add(struct ohash*, struct tofu_entry*);
296 void			 tofu_update(struct ohash*, struct tofu_entry*);
297 
298 /* ui.c */
299 unsigned int	 tab_new_id(void);
300 int		 ui_init(int, char * const*);
301 void		 ui_on_tab_loaded(struct tab*);
302 void		 ui_on_tab_refresh(struct tab*);
303 void		 ui_require_input(struct tab*, int);
304 void		 ui_read(const char*, void(*)(const char*, unsigned int), unsigned int);
305 void		 ui_yornp(const char*, void (*)(int, unsigned int), unsigned int);
306 void		 ui_notify(const char*, ...) __attribute__((format(printf, 1, 2)));
307 void		 ui_end(void);
308 
309 /* utf.8 */
310 uint32_t	 utf8_decode(uint32_t*restrict, uint32_t*restrict, uint8_t);
311 size_t		 utf8_encode(uint32_t, char*);
312 char		*utf8_nth(char*, size_t);
313 size_t		 utf8_cplen(char*);
314 size_t		 utf8_chwidth(uint32_t);
315 size_t		 utf8_snwidth(const char*, size_t);
316 size_t		 utf8_swidth(const char*);
317 size_t		 utf8_swidth_between(const char*, const char*);
318 char		*utf8_next_cp(const char*);
319 char		*utf8_prev_cp(const char*, const char*);
320 
321 /* util.c */
322 int		 mark_nonblock(int);
323 int		 has_prefix(const char*, const char*);
324 int		 unicode_isspace(uint32_t);
325 int		 unicode_isgraph(uint32_t);
326 void		 dispatch_imsg(struct imsgbuf*, imsg_handlerfn**, size_t);
327 
328 /* wrap.c */
329 void		 empty_linelist(struct buffer*);
330 void		 empty_vlist(struct buffer*);
331 int		 wrap_text(struct buffer*, const char*, struct line*, size_t);
332 int		 hardwrap_text(struct buffer*, struct line*, size_t);
333 
334 #endif /* TELESCOPE_H */