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const kRedirectorWildcard = 'W';
const kRedirectorRegex= 'R';
var Redirector = {
list : [],
enabled : true,
init : function() {
this.load();
this.prefObserver.register();
},
unload : function() {
this.prefObserver.unregister();
},
save : function() {
var r
, tempList = [];
for each (r in this.list) {
tempList.push([r.exampleUrl, r.pattern, r.redirectUrl, r.onlyIfLinkExists, r.patternType]);
}
RedirLib.setCharPref('redirects', tempList.toSource());
},
load : function() {
var tempList = eval(RedirLib.getCharPref('redirects'));
var arr;
this.list = [];
for each (arr in tempList) {
this.list.push({
exampleUrl : arr[0],
pattern : arr[1],
redirectUrl : arr[2],
onlyIfLinkExists : arr[3],
patternType : arr[4]
});
}
},
addRedirect : function(redirect) {
this.list.push(redirect);
this.save();
},
deleteAt : function(index) {
this.list.splice(index, 1);
this.save();
},
getRedirectUrlForInstantRedirect : function(url) {
var redirect, link, links, redirectUrl;
if (this.enabled) {
for each (redirect in this.list) {
redirectUrl = this.getRedirectUrl(url, redirect);
//Can't do fast redirect if it requires that link exists
//we need the original page to verify that it exists.
//Slow redirect will be done automatically.
if (redirectUrl) {
if (!redirect.onlyIfLinkExists && !redirect.redirectUrl.startsWith('xpath:')) {
RedirLib.debug('%1 matches %2, and it\'s not only if link exists and not an xpath expression. Can do instant redirect.'._(redirect.pattern, url));
return { 'url' : redirectUrl, 'pattern' : redirect.pattern};
} else if (redirect.redirectUrl.startsWith('xpath:')) {
RedirLib.debug('%1 matches %2, but the redirect is a xpath expression and so has to be a slow redirect'._(redirect.pattern, url));
} else {
RedirLib.debug('%1 matches %2, but it\'s "only if link exists" and so has to be a slow redirect'._(redirect.pattern, url));
}
}
}
}
return { 'url' : null, 'pattern' : null};
},
getRedirectUrl: function(url, redirect) {
if (redirect.patternType == kRedirectorWildcard) {
return this.wildcardMatch(redirect.pattern, url, redirect.redirectUrl);
} else if (redirect.patternType == kRedirectorRegex) {
return this.regexMatch(redirect.pattern, url, redirect.redirectUrl);
}
return null;
},
processUrl : function(url) {
var redirect, link, links, redirectUrl;
if (!this.enabled) {
return;
}
for each (redirect in this.list) {
redirectUrl = this.getRedirectUrl(url, redirect);
if (redirectUrl) {
RedirLib.debug('%1 matches %2'._(redirect.pattern, url));
if (redirect.onlyIfLinkExists) {
links = window.content.document.getElementsByTagName('a');
for each(link in links) {
if (link.href && link.href.toString() == redirectUrl) {
RedirLib.debug('Found a link for %1'._(redirectUrl));
this.goto(redirectUrl, redirect.pattern, url, window.content.document);
return;
}
}
RedirLib.debug('Did not find a link for %1'._(redirectUrl));
} else {
this.goto(redirectUrl, redirect.pattern, url, window.content.document);
}
}
}
},
makeAbsoluteUrl : function(currentUrl, relativeUrl) {
if (relativeUrl.startsWith('http://') || relativeUrl.startsWith('https://')) {
return relativeUrl;
}
var ioService = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
RedirLib.debug(currentUrl);
var uri = ioService.newURI(currentUrl, null, null);
return uri.resolve(relativeUrl);
},
goto : function(redirectUrl, pattern, url, doc) {
if (redirectUrl.startsWith('xpath:')) {
var xpath = redirectUrl.substr('xpath:'.length);
RedirLib.debug('Evaluating xpath: ' + xpath);
xpathResult = doc.evaluate(redirectUrl.substr('xpath:'.length), doc, null, XPathResult.STRING_TYPE,null);
if (!xpathResult) {
//fail silently
RedirLib.debug('%1 returned nothing on url %2'._(xpath, url));
return;
} else {
RedirLib.debug('%1 evaluated to %2'._(redirectUrl, xpathResult.stringValue));
redirectUrl = xpathResult.stringValue;
if (redirectUrl == '') {
RedirLib.debug('XPath failed, no redirection will be made');
return;
}
}
}
redirectUrl = this.makeAbsoluteUrl(url, redirectUrl);
if (redirectUrl == url) {
RedirLib.msgBox(this.strings.getString('extensionName'), this.strings.getFormattedString('recursiveError', [pattern, redirectUrl]));
} else {
doc.location.href = redirectUrl;
}
},
regexMatch : function(pattern, text, redirectUrl) {
var strings, rx, match;
try {
rx = new RegExp(pattern, 'gi');
match = rx.exec(text);
} catch(e) {
//HACK, need to make this better
if (window.RedirectorOverlay) {
strings = window.RedirectorOverlay.strings;
} else if(window.Redirect) {
strings = window.Redirect.strings;
}
RedirLib.msgBox(strings.getString('extensionName'), strings.getFormattedString('regexPatternError', [pattern, e.toString()]));
return null;
}
var rxrepl;
if (match) {
for (var i = 1; i < match.length; i++) {
rxrepl = new RegExp('\\$' + i, 'gi');
redirectUrl = redirectUrl.replace(rxrepl, match[i]);
}
return redirectUrl;
}
return null;
},
wildcardMatch : function(pattern, text, redirectUrl) {
var parts
, part
, i
, pos;
parts = pattern.split('*');
for (i in parts) {
part = parts[i];
pos = text.indexOf(part);
if (pos == -1) {
return null;
}
if (i == 0 && pos != 0) {
return null;
}
if (i == parts.length -1 && i != "" && text.substr(text.length - part.length) != part) {
return null;
}
text = text.substr(pos + part.length);
}
return redirectUrl;
},
prefObserver : {
getService : function() {
return Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranchInternal);
},
register: function() {
this.getService().addObserver('extensions.redirector', this, false);
},
unregister: function() {
this.getService().removeObserver('extensions.redirector', this);
},
observe : function(subject, topic, data) {
if (topic != 'nsPref:changed') {
return;
}
if (!window.Redirector) {
return;
}
if (data == 'extensions.redirector.redirects') {
Redirector.load();
} else if (data == 'extensions.redirector.enabled') {
Redirector.enabled = RedirLib.getBoolPref('enabled');
}
}
}
};
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