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cel / dillo-gemini



Tree: 3eaae0075f7e0bd94595e6486528262ad962274c

Files: 3eaae0075f7e0bd94595e6486528262ad962274c / gemini.filter.dpi

3127 bytesRaw
1#!/bin/bash
2# dillo-gemini
3# © 2019 cel @f/6sQ6d2CMxRUhLpspgGIulDxDCwYD7DzFzPNr7u5AU=.ed25519
4# Copying and distribution of this file, with or without modification,
5# are permitted in any medium without royalty provided the copyright
6# notice and this notice are preserved.  This file is offered as-is,
7# without any warranty.
8
9read -d '>' auth
10read -d '>' cmd
11case "$cmd" in
12	"<cmd='open_url' url='"*);;
13	*) echo $cmd; exit;;
14esac
15url=${cmd#"<cmd='open_url' url='"}
16url=${url%"' '"}
17
18serve_404() {
19	printf "<cmd='start_send_page' url='' '>\n"
20	printf "Content-type: text/plain\r\n\r\n"
21	echo Not found
22}
23
24render_gemini() {
25	printf "Content-type: text/html\r\n\r\n<!doctype html><pre>"
26	sed 's/^\(=>\s*\)\(\S*\)*\(.*\)/\1<a href="\2">\2<\/a>\3/'
27	printf "%s" "</pre>"
28}
29
30send_status_msg() {
31	printf "<cmd='send_status_message' msg='%s' '>" "$*"
32}
33
34serve_status_not_supported() {
35	printf "<cmd='start_send_page' url='' '>\n"
36	printf "Content-type: text/plain\r\n\r\n"
37	echo Status not implemented: $1
38	echo $2
39}
40
41serve_missing_status() {
42	printf "<cmd='start_send_page' url='' '>\n"
43	printf "Content-type: text/plain\r\n\r\n"
44	echo Empty status response. $2
45}
46
47serve_success() {
48	printf "<cmd='start_send_page' url='' '>\n"
49	type=$1
50	case "$type" in
51		text/gemini*) render_gemini;;
52		*) printf "Content-type: $type\r\n\r\n"; cat;;
53	esac
54}
55
56serve_redirect() {
57	url=$1
58	send_status_msg "Redirected"
59	printf "<cmd='start_send_page' url='' '>\n"
60	printf "Content-type: text/html\r\n\r\n"
61	# TODO: html-escape url
62	cat <<-EOF
63	<!doctype html>
64	<html>
65	<head>
66	<title>Redirect to $url</title>
67	</head>
68	<body>
69	<h3>Redirect to <a href="$url">$url</a></3>
70	</body>
71	</html>
72	EOF
73}
74
75serve_error() {
76	status=$1
77	meta=$2
78	send_status_msg "Request failed"
79	printf "<cmd='start_send_page' url='' '>\n"
80	printf "Content-type: text/html\r\n\r\n"
81	cat <<-EOF
82	<!doctype html>
83	<html>
84	<head>
85	<title>Request failed</title>
86	</head>
87	<body>
88	<h3>Request failed: $status</h3>
89	<code>$meta</code>
90	</body>
91	</html>
92	EOF
93}
94
95serve_fail() {
96	meta="$1"
97	send_status_msg "Client certificate required"
98	printf "<cmd='start_send_page' url='' '>\n"
99	printf "Content-type: text/html\r\n\r\n"
100	cat <<-EOF
101	<!doctype html>
102	<html>
103	<head>
104	<title>Client certificate required</title>
105	</head>
106	<body>
107	<h3>Client certificate required</h3>
108	<p>Not implemented!</p>
109	<code>$meta</code>
110	</body>
111	</html>
112	EOF
113}
114
115serve_gemini() {
116	url=$1
117	url1=${url#gemini://}
118	hostname=${url1%%/*}
119	host=${hostname%%:*}
120	port=${hostname##*:}
121	if [ "$host" = "$port" ]; then port=1965; fi
122	send_status_msg "Sending request..."
123	printf "%s\r\n" "$url" | ncat --ssl "$host" "$port" | {
124		read status meta
125		send_status_msg "Status: $status"
126		meta=$(echo "$meta" | sed 's/\s*$//')
127		case "$status" in
128			1*) serve_input "$meta";;
129			2*) serve_success "$meta";;
130			3*) serve_redirect "$meta";;
131			4*) serve_error "$status" "$meta";;
132			5*) serve_error "$meta";;
133			6*) serve_client_cert_required "$meta";;
134			'') serve_missing_status "$meta";;
135			*) serve_status_not_supported "$status" "$meta";;
136		esac
137	}
138}
139
140case "$url" in
141	gemini:*) serve_gemini "$url";;
142	*) serve_404;;
143esac
144

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