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 "url.h"
23 
24 #define GEMINI_URL_LEN 1024
25 
26 enum imsg_type {
27 	IMSG_GET,		/* data is URL, peerid the tab id */
28 	IMSG_ERR,
29 	IMSG_CHECK_CERT,
30 	IMSG_CERT_STATUS,
31 	IMSG_GOT_CODE,
32 	IMSG_GOT_META,
33 	IMSG_PROCEED,
34 	IMSG_STOP,
35 	IMSG_BUF,
36 	IMSG_EOF,
37 	IMSG_QUIT,
38 };
39 
40 enum line_type {
41 	LINE_TEXT,
42 	LINE_LINK,
43 	LINE_TITLE_1,
44 	LINE_TITLE_2,
45 	LINE_TITLE_3,
46 	LINE_ITEM,
47 	LINE_QUOTE,
48 	LINE_PRE_START,
49 	LINE_PRE_CONTENT,
50 	LINE_PRE_END,
51 };
52 
53 struct line {
54 	enum line_type		 type;
55 	char			*line;
56 	char			*alt;
57 	TAILQ_ENTRY(line)	 lines;
58 };
59 
60 struct parser;
61 struct page;
62 
63 /* typedef void	(*initparserfn)(struct parser*); */
64 
65 typedef int	(*parsechunkfn)(struct parser*, const char*, size_t);
66 typedef int	(*parserfreefn)(struct parser*);
67 
68 typedef void (imsg_handlerfn)(struct imsg*, size_t);
69 
70 struct parser {
71 	const char	*name;
72 	char		*buf;
73 	size_t		 len;
74 	size_t		 cap;
75 	int		 flags;
76 	parsechunkfn	 parse;
77 	parserfreefn	 free;
78 
79 	TAILQ_HEAD(, line)	 head;
80 };
81 
82 struct ui_state;
83 
84 extern TAILQ_HEAD(tabshead, tab) tabshead;
85 struct tab {
86 	struct parser		 page;
87 	TAILQ_ENTRY(tab)	 tabs;
88 	uint32_t		 id;
89 	uint32_t		 flags;
90 
91 	char			 urlstr[GEMINI_URL_LEN];
92 	struct url		 url;
93 
94 	int			 code;
95 	char			 meta[GEMINI_URL_LEN];
96 	int			 redirect_count;
97 
98 	struct ui_state		*s;
99 };
100 
101 struct proto {
102 	const char	*schema;
103 
104 	/* should load the given url in the tab.  Optionally, it may
105 	 * consider the given url as relative to the one already
106 	 * present in tab.  It must set tab->urlstr to a serialized
107 	 * human-friendly URL. */
108 	void		 (*loadfn)(struct tab*, const char*);
109 };
110 
111 extern struct event		 imsgev;
112 
113 /* gemini.c */
114 int		 client_main(struct imsgbuf *b);
115 
116 /* gemtext.c */
117 void		 gemtext_initparser(struct parser*);
118 
119 /* mime.c */
120 int		 setup_parser_for(struct tab*);
121 
122 /* pages.c */
123 extern const char	*about_new;
124 
125 #define CANNOT_FETCH		0
126 #define TOO_MUCH_REDIRECTS	1
127 #define MALFORMED_RESPONSE	2
128 #define UNKNOWN_TYPE_OR_CSET	3
129 extern const char	*err_pages[70];
130 
131 /* parser.c */
132 int		 parser_append(struct parser*, const char*, size_t);
133 int		 parser_set_buf(struct parser*, const char*, size_t);
134 
135 /* telescope.c */
136 void		 load_about_url(struct tab*, const char*);
137 void		 load_gemini_url(struct tab*, const char*);
138 void		 load_url(struct tab*, const char*);
139 void		 stop_tab(struct tab*);
140 
141 /* textplain.c */
142 void		 textplain_initparser(struct parser*);
143 
144 /* ui.c */
145 int		 ui_init(void);
146 void		 ui_on_tab_loaded(struct tab*);
147 void		 ui_on_tab_refresh(struct tab*);
148 void		 ui_require_input(struct tab*, int);
149 void		 ui_end(void);
150 
151 /* util.c */
152 int		 mark_nonblock(int);
153 char		*telescope_strnchr(char*, char, size_t);
154 int		 has_prefix(const char*, const char*);
155 
156 #endif /* TELESCOPE_H */