forked from davidmz/apng-chrome
-
Notifications
You must be signed in to change notification settings - Fork 0
/
background.js
124 lines (114 loc) · 4.17 KB
/
background.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
var isPNG = function (info) {
for (var i = 0, l = info.responseHeaders.length; i < l; i++) {
var h = info.responseHeaders[i];
if (h.name.toLowerCase() == "content-type") {
return (h.value.toLowerCase() == "image/png");
}
}
return false;
};
var isURLVolatile = function (url) {
// https://id.tmtm.ru/captcha/ etc.
return url.indexOf("captcha") != -1;
};
var isURLNotVolatile = function (url) {
return !!url.match(/^https?:\/\/([^/]+\.)?googlegroups\.com\//);
};
var isVolatile = function (info) {
if (info.method != "GET") return true;
if (isURLVolatile(info.url)) return true;
if (isURLNotVolatile(info.url)) return false;
if (info.fromCache) return false;
for (var i = 0, l = info.responseHeaders.length; i < l; i++) {
var n = info.responseHeaders[i].name.toLowerCase();
var v = info.responseHeaders[i].value.toLowerCase();
if (
n == "cache-control" && (
v.indexOf("no-cache") != -1
|| v.indexOf("no-store") != -1
|| v.indexOf("must-revalidate") != -1
)
|| n == "pragma" && v.indexOf("no-cache") != -1
|| n == "expires" && new Date(v) <= new Date()
) {
return true;
}
}
return false;
};
var checkHostname = function (hostname) {
hostname = hostname.toLowerCase();
var mode = localStorage["mode"];
if (mode != "white") mode = "black";
var list = localStorage[mode + "List"];
var hostNames = list ? list.toLowerCase().split(/[^a-z0-9.*-]+/) : [];
var inList = false;
hostNames.forEach(function (it) {
if (it.substr(0, 2) == "*.") {
inList = inList || (hostname.substr(-it.length + 1) == it.substr(1));
} else {
inList = inList || (hostname == it);
}
});
return (mode == "black") ? !inList : inList;
};
var PNGUrls = {};
var getPNGDef = function(url) {
if (!(url in PNGUrls)) PNGUrls[url] = Deferred();
return PNGUrls[url];
};
// GC
var lastPNGFound = new Date();
(function() {
if (new Date - lastPNGFound > 10*60*1000) {
// если больше 10 минут не было новых картинок
chrome.webRequest.handlerBehaviorChanged();
lastPNGFound = new Date();
PNGUrls = {};
// возвращаемся через час
setTimeout(arguments.callee, 60*60*1000);
} else {
// возвращаемся через 10 минут
setTimeout(arguments.callee, 10*60*1000);
}
})();
chrome.webRequest.onCompleted.addListener(
function (info) {
if (!(info.url in PNGUrls)) lastPNGFound = new Date();
var d = getPNGDef(info.url);
if (!d.promise().isResolved()) d.resolve(isPNG(info) && !isVolatile(info));
},
{ urls:["<all_urls>"], types:["image", "main_frame", "sub_frame"] },
["responseHeaders"]
);
chrome.webRequest.onBeforeRedirect.addListener(
function (info) {
getPNGDef(info.redirectUrl).promise().done(function(x) {
getPNGDef(info.url).resolve(x);
});
},
{ urls:["<all_urls>"], types:["image", "main_frame", "sub_frame"] }
);
chrome.extension.onRequest.addListener(function(request, sender, callback) {
if (request.action == "checkUrl") {
getPNGDef(request.url).promise().done(callback);
} else if (request.action == "isAnAPNG") {
getPNGDef(request.url).resolve(request.isIt);
} else if (request.action == "checkHostname") {
var enabled = checkHostname(request.data);
chrome.browserAction.setIcon({
"tabId":sender.tab.id,
"path": enabled ? "img/apng-logo-19-on.png" : "img/apng-logo-19-off.png"
});
callback(enabled);
} else if (request.action == "apngFound" && request.data > 0) {
chrome.browserAction.setIcon({
"tabId":sender.tab.id,
"path":"img/apng-logo-19-found.png"
});
chrome.browserAction.setBadgeText({
"tabId":sender.tab.id,
"text":request.data.toString()
});
}
});