1 | // Website you intended to retrieve for users. |
2 | const upstream = 'www.google.com' |
3 |
4 | // Custom pathname for the upstream website. |
5 | const upstream_path = '/' |
6 |
7 | // Website you intended to retrieve for users using mobile devices. |
8 | const upstream_mobile = 'www.google.com' |
9 |
10 | // Countries and regions where you wish to suspend your service. |
11 | const blocked_region = ['KP', 'SY', 'PK', 'CU'] |
12 |
13 | // IP addresses which you wish to block from using your service. |
14 | const blocked_ip_address = ['0.0.0.0', '127.0.0.1'] |
15 |
16 | // Whether to use HTTPS protocol for upstream address. |
17 | const https = true |
18 |
19 | // Whether to disable cache. |
20 | const disable_cache = false |
21 |
22 | // Replace texts. |
23 | const replace_dict = { |
24 | '$upstream': '$custom_domain', |
25 | '//google.com': '' |
26 | } |
27 |
28 | addEventListener('fetch', event => { |
29 | event.respondWith(fetchAndApply(event.request)); |
30 | }) |
31 |
32 | async function fetchAndApply(request) { |
33 | const region = request.headers.get('cf-ipcountry').toUpperCase(); |
34 | const ip_address = request.headers.get('cf-connecting-ip'); |
35 | const user_agent = request.headers.get('user-agent'); |
36 |
37 | let response = null; |
38 | let url = new URL(request.url); |
39 | let url_hostname = url.hostname; |
40 |
41 | if (https == true) { |
42 | url.protocol = 'https:'; |
43 | } else { |
44 | url.protocol = 'http:'; |
45 | } |
46 |
47 | if (await device_status(user_agent)) { |
48 | var upstream_domain = upstream; |
49 | } else { |
50 | var upstream_domain = upstream_mobile; |
51 | } |
52 |
53 | url.host = upstream_domain; |
54 | if (url.pathname == '/') { |
55 | url.pathname = upstream_path; |
56 | } else { |
57 | url.pathname = upstream_path + url.pathname; |
58 | } |
59 |
60 | if (blocked_region.includes(region)) { |
61 | response = new Response('Access denied: WorkersProxy is not available in your region yet.', { |
62 | status: 403 |
63 | }); |
64 | } else if (blocked_ip_address.includes(ip_address)) { |
65 | response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', { |
66 | status: 403 |
67 | }); |
68 | } else { |
69 | let method = request.method; |
70 | let request_headers = request.headers; |
71 | let new_request_headers = new Headers(request_headers); |
72 |
73 | new_request_headers.set('Host', upstream_domain); |
74 | new_request_headers.set('Referer', url.protocol + '//' + url_hostname); |
75 |
76 | let original_response = await fetch(url.href, { |
77 | method: method, |
78 | headers: new_request_headers |
79 | }) |
80 |
81 | connection_upgrade = new_request_headers.get("Upgrade"); |
82 | if (connection_upgrade && connection_upgrade.toLowerCase() == "websocket") { |
83 | return original_response; |
84 | } |
85 |
86 | let original_response_clone = original_response.clone(); |
87 | let original_text = null; |
88 | let response_headers = original_response.headers; |
89 | let new_response_headers = new Headers(response_headers); |
90 | let status = original_response.status; |
91 | |
92 | if (disable_cache) { |
93 | new_response_headers.set('Cache-Control', 'no-store'); |
94 | } |
95 |
96 | new_response_headers.set('access-control-allow-origin', '*'); |
97 | new_response_headers.set('access-control-allow-credentials', true); |
98 | new_response_headers.delete('content-security-policy'); |
99 | new_response_headers.delete('content-security-policy-report-only'); |
100 | new_response_headers.delete('clear-site-data'); |
101 | |
102 | if (new_response_headers.get("x-pjax-url")) { |
103 | new_response_headers.set("x-pjax-url", response_headers.get("x-pjax-url").replace("//" + upstream_domain, "//" + url_hostname)); |
104 | } |
105 | |
106 | const content_type = new_response_headers.get('content-type'); |
107 | if (content_type != null && content_type.includes('text/html') && content_type.includes('UTF-8')) { |
108 | original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname); |
109 | } else { |
110 | original_text = original_response_clone.body |
111 | } |
112 | |
113 | response = new Response(original_text, { |
114 | status, |
115 | headers: new_response_headers |
116 | }) |
117 | } |
118 | return response; |
119 | } |
120 |
121 | async function replace_response_text(response, upstream_domain, host_name) { |
122 | let text = await response.text() |
123 |
124 | var i, j; |
125 | for (i in replace_dict) { |
126 | j = replace_dict[i] |
127 | if (i == '$upstream') { |
128 | i = upstream_domain |
129 | } else if (i == '$custom_domain') { |
130 | i = host_name |
131 | } |
132 |
133 | if (j == '$upstream') { |
134 | j = upstream_domain |
135 | } else if (j == '$custom_domain') { |
136 | j = host_name |
137 | } |
138 |
139 | let re = new RegExp(i, 'g') |
140 | text = text.replace(re, j); |
141 | } |
142 | return text; |
143 | } |
144 |
145 |
146 | async function device_status(user_agent_info) { |
147 | var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"]; |
148 | var flag = true; |
149 | for (var v = 0; v < agents.length; v++) { |
150 | if (user_agent_info.indexOf(agents[v]) > 0) { |
151 | flag = false; |
152 | break; |
153 | } |
154 | } |
155 | return flag; |
156 | } |