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 "compat.h"
21 
22 #include <event.h>
23 
24 #include "url.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 };
51 
52 enum line_type {
53 	LINE_TEXT,
54 	LINE_LINK,
55 	LINE_TITLE_1,
56 	LINE_TITLE_2,
57 	LINE_TITLE_3,
58 	LINE_ITEM,
59 	LINE_QUOTE,
60 	LINE_PRE_START,
61 	LINE_PRE_CONTENT,
62 	LINE_PRE_END,
63 };
64 
65 struct line {
66 	enum line_type		 type;
67 	char			*line;
68 	char			*alt;
69 	int			 flags;
70 	TAILQ_ENTRY(line)	 lines;
71 };
72 
73 struct vline {
74 	const struct line	*parent;
75 	char			*line;
76 	int			 flags;
77 	TAILQ_ENTRY(vline)	 vlines;
78 };
79 
80 struct parser;
81 struct page;
82 
83 /* typedef void	(*initparserfn)(struct parser*); */
84 
85 typedef int	(*parsechunkfn)(struct parser*, const char*, size_t);
86 typedef int	(*parserfreefn)(struct parser*);
87 
88 typedef void (imsg_handlerfn)(struct imsg*, size_t);
89 
90 struct parser {
91 	const char	*name;
92 	char		 title[32+1];
93 	char		*buf;
94 	size_t		 len;
95 	size_t		 cap;
96 	int		 flags;
97 	parsechunkfn	 parse;
98 	parserfreefn	 free;
99 
100 	TAILQ_HEAD(, line)	 head;
101 };
102 
103 /*
104  * differnt types of trust for a certificate.  Following
105  * gemini://thfr.info/gemini/modified-trust-verify.gmi
106  */
107 enum trust_state {
108 	TS_UNKNOWN,
109 	TS_UNTRUSTED,
110 	TS_TRUSTED,
111 	TS_VERIFIED,
112 };
113 
114 struct tofu_entry {
115 	char	domain[GEMINI_URL_LEN];
116 	/* enough space for ``PROTO:HASH''.  probably isn't a good
117 	 * idea thou. */
118 	char	hash[128+1];
119 	int	verified;
120 };
121 
122 struct histhead {
123 	TAILQ_HEAD(mhisthead, hist)	head;
124 	size_t				len;
125 };
126 struct hist {
127 	char			h[1025];
128 	TAILQ_ENTRY(hist)	entries;
129 };
130 
131 struct window {
132 	struct parser		 page;
133 	int			 curs_x;
134 	int			 curs_y;
135 	size_t			 line_off;
136 	size_t			 line_max;
137 	struct vline		*current_line;
138 	size_t			 cpoff;
139 	TAILQ_HEAD(vhead, vline) head;
140 };
141 
142 extern TAILQ_HEAD(tabshead, tab) tabshead;
143 struct tab {
144 	TAILQ_ENTRY(tab)	 tabs;
145 	uint32_t		 id;
146 	uint32_t		 flags;
147 
148 	enum trust_state	 trust;
149 	struct url		 url;
150 	struct histhead		 hist;
151 	struct hist		*hist_cur;
152 	size_t			 hist_off;
153 
154 	int			 code;
155 	char			 meta[GEMINI_URL_LEN];
156 	int			 redirect_count;
157 
158 	struct window		 window;
159 
160 	short			 loading_anim;
161 	short			 loading_anim_step;
162 	struct event		 loadingev;
163 };
164 
165 struct proto {
166 	const char	*schema;
167 
168 	/* should load the given url in the tab.  Optionally, it may
169 	 * consider the given url as relative to the one already
170 	 * present in tab.  It must set tab->urlstr to a serialized
171 	 * human-friendly URL. */
172 	void		 (*loadfn)(struct tab*, const char*);
173 };
174 
175 struct kmap {
176 	TAILQ_HEAD(map, keymap)	m;
177 	void			(*unhandled_input)(void);
178 };
179 
180 struct keymap {
181 	int			 meta;
182 	int			 key;
183 	struct kmap		 map;
184 	void			(*fn)(struct window*);
185 
186 	TAILQ_ENTRY(keymap)	 keymaps;
187 };
188 
189 /* fs.c */
190 int		 fs_init(void);
191 int		 fs_main(struct imsgbuf*);
192 int		 load_certs(struct ohash*);
193 
194 /* gemini.c */
195 int		 client_main(struct imsgbuf*);
196 
197 /* gemtext.c */
198 void		 gemtext_initparser(struct parser*);
199 
200 /* hash.c */
201 void			 telescope_ohash_init(struct ohash*, unsigned int, ptrdiff_t);
202 struct tofu_entry	*telescope_lookup_tofu(struct ohash*, const char*);
203 void			 telescope_ohash_insert(struct ohash*, struct tofu_entry*);
204 
205 /* hist.c */
206 void		 hist_clear_forward(struct histhead*, struct hist*);
207 void		 hist_push(struct histhead*, struct hist*);
208 
209 /* keymap.c */
210 int		 kbd(const char*);
211 const char	*unkbd(int);
212 int		 kmap_define_key(struct kmap*, const char*, void(*)(struct window*));
213 
214 /* mime.c */
215 int		 setup_parser_for(struct tab*);
216 
217 /* pages.c */
218 extern const char	*about_new;
219 
220 #define CANNOT_FETCH		0
221 #define TOO_MUCH_REDIRECTS	1
222 #define MALFORMED_RESPONSE	2
223 #define UNKNOWN_TYPE_OR_CSET	3
224 extern const char	*err_pages[70];
225 
226 /* parser.c */
227 int		 parser_append(struct parser*, const char*, size_t);
228 int		 parser_set_buf(struct parser*, const char*, size_t);
229 int		 parser_foreach_line(struct parser*, const char*, size_t, parsechunkfn);
230 
231 /* sandbox.c */
232 void		 sandbox_network_process(void);
233 void		 sandbox_ui_process(void);
234 void		 sandbox_fs_process(void);
235 
236 /* telescope.c */
237 void		 load_about_url(struct tab*, const char*);
238 void		 load_gemini_url(struct tab*, const char*);
239 void		 load_url(struct tab*, const char*);
240 int		 load_previous_page(struct tab*);
241 int		 load_next_page(struct tab*);
242 void		 stop_tab(struct tab*);
243 void		 add_to_bookmarks(const char*);
244 
245 /* textplain.c */
246 void		 textplain_initparser(struct parser*);
247 
248 /* ui.c */
249 int		 ui_init(int, char * const*);
250 void		 ui_on_tab_loaded(struct tab*);
251 void		 ui_on_tab_refresh(struct tab*);
252 void		 ui_require_input(struct tab*, int);
253 void		 ui_yornp(const char*, void (*)(int, unsigned int));
254 void		 ui_notify(const char*, ...) __attribute__((format(printf, 1, 2)));
255 void		 ui_end(void);
256 
257 /* utf.8 */
258 uint32_t	 utf8_decode(uint32_t*restrict, uint32_t*restrict, uint8_t);
259 size_t		 utf8_encode(uint32_t, char*);
260 char		*utf8_nth(char*, size_t);
261 size_t		 utf8_cplen(char*);
262 size_t		 utf8_chwidth(uint32_t);
263 size_t		 utf8_snwidth(const char*, size_t);
264 size_t		 utf8_swidth(const char*);
265 size_t		 utf8_swidth_between(const char*, const char*);
266 char		*utf8_next_cp(const char*);
267 char		*utf8_prev_cp(const char*, const char*);
268 
269 /* util.c */
270 int		 mark_nonblock(int);
271 int		 has_prefix(const char*, const char*);
272 int		 unicode_isspace(uint32_t);
273 int		 unicode_isgraph(uint32_t);
274 void		 dispatch_imsg(struct imsgbuf*, imsg_handlerfn**, size_t);
275 
276 /* wrap.c */
277 int		 wrap_text(struct window*, const char*, struct line*, size_t);
278 int		 hardwrap_text(struct window*, struct line*, size_t);
279 
280 #endif /* TELESCOPE_H */