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java-redirect.js
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const computeModuleMap = async (version) => {
const restrictedVersion = Math.min(21, version);
const response = await fetch(browser.runtime.getURL(`json/modules-v${restrictedVersion}.json`));
const json = await response.json();
return json.reduce((map, element) => {
map[element.package] = element.module;
return map;
}, {});
};
const getReplaceAlgorithm = async version => {
const versionInt = parseInt(version, 10) || 21;
const [moduleMap, javaFxModuleMap] = versionInt >= 11
? await Promise.all([computeModuleMap(versionInt), computeModuleMap(10)])
: null;
switch (versionInt) {
case 8:
return url => url.replace(/^https?\:\/\/docs\.oracle\.com\/javase\/(?:[678]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))/g, 'https://docs.oracle.com/javase/8');
case 9:
return url => url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:javafx|javase)\/(?:[6789]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/(?:docs|javafx))/g, 'https://docs.oracle.com/javase/9/docs');
case 10:
return url => url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:javafx|javase)\/(?:[6789]|10|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/(?:docs|javafx))/g, 'https://docs.oracle.com/javase/10/docs');
case 11:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|javase\/(?:[89]|10)\/javafx)\/api\/([a-z/]+)\//g, (_, g1) => `https://openjfx.io/javadoc/11/${javaFxModuleMap[g1.replace(/\//g, '.')]}/${g1}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/javase\/(?:[6789]|10|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/([a-z/]+)\//g, (_, g1) => `https://docs.oracle.com/en/java/javase/11/docs/api/${moduleMap[g1.replace(/\//g, '.')]}/${g1}/`);
};
case 12:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|10|11)\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/12/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|10|11|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/12/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 13:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[012])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/13/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[012]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/13/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 14:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[0123])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/14/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[0123]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/14/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 15:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[01234])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/15/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[01234]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/15/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 16:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[012345])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/16/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[012345]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/16/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 17:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[0123456])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/17/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[0123456]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/17/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 18:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[01234567])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/18/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[01234567]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/18/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 19:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1[012345678])\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/19/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1[012345678]|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/19/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 20:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1\d)\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/20/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1\d|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/20/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
case 21:
return url => {
if (url.includes('javafx')) {
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:javafx\/2|(?:en\/java\/)?javase\/(?:[89]|1\d|20)\/javafx)\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://openjfx.io/javadoc/21/${g1 || javaFxModuleMap[g2.replace(/\//g, '.')]}/${g2}/`);
}
return url.replace(/^https?\:\/\/docs\.oracle\.com\/(?:en\/java\/)?javase\/(?:[6789]|1\d|20|(?:1\.(?:(?:5\.0)|(?:4\.2)|[3])))\/docs\/api\/(?:((?:java|jdk)\.(?:\w|\.)+)\/)?([a-z/]+)\//g, (_, g1, g2) => `https://docs.oracle.com/en/java/javase/21/docs/api/${g1 || moduleMap[g2.replace(/\//g, '.')]}/${g2}/`);
};
default:
throw new Error(`Invalid version ${versionInt}`);
}
};
browser.webRequest.onBeforeRequest.addListener(
async details => {
// Only redirect HTML
if (!details.url.match(/\.html(?:#.*)?$/)) {
return {};
}
const result = await browser.storage.sync.get();
const replaceUrl = await getReplaceAlgorithm(result['java-version']);
const redirectionTarget = replaceUrl(details.url);
if (redirectionTarget !== details.url) {
const response = await fetch(redirectionTarget, { method: 'HEAD' });
if (response.ok && !response.redirected) {
return { redirectUrl: redirectionTarget };
}
}
return {};
},
{
urls: ['*://docs.oracle.com/*'],
types: ['main_frame', 'sub_frame']
},
['blocking']
);