checkVersion

Greasyfork Check Version Source Code
Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/447149/1065246/checkVersion.js
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// ==UserScript==
// @name         checkVersion
// @description  Greasyfork Check Version Source Code
// @version      1.0.1
// @author       kiccer<[email protected]>
// @license      MIT
// @match        https://greasyfork.org/*
// @grant        none
// ==/UserScript==

(() => {
    function getTampermonkey () {
        return window.external?.Tampermonkey
    }

    function getViolentmonkey () {
        return window.external?.Violentmonkey
    }

    function getInstalledVersion (name, namespace) {
        return new Promise(function (resolve, reject) {
            const tm = getTampermonkey()
            if (tm) {
                tm.isInstalled(name, namespace, function (i) {
                    if (i.installed) {
                        resolve(i.version)
                    } else {
                        resolve(null)
                    }
                })
                return
            }

            const vm = getViolentmonkey()
            if (vm) {
                vm.isInstalled(name, namespace).then(resolve)
                return
            };

            reject(Error)
        })
    }

    // https://developer.mozilla.org/en/docs/Toolkit_version_format
    function compareVersions (a, b) {
        if (a === b) {
            return 0
        }
        const aParts = a.split('.')
        const bParts = b.split('.')
        for (let i = 0; i < aParts.length; i++) {
            const result = compareVersionPart(aParts[i], bParts[i])
            if (result !== 0) {
                return result
            }
        }
        return 0
    }

    function compareVersionPart (partA, partB) {
        const partAParts = parseVersionPart(partA)
        const partBParts = parseVersionPart(partB)
        for (let i = 0; i < partAParts.length; i++) {
            // "A string-part that exists is always less than a string-part that doesn't exist"
            if (partAParts[i].length > 0 && partBParts[i].length === 0) {
                return -1
            }
            if (partAParts[i].length === 0 && partBParts[i].length > 0) {
                return 1
            }
            if (partAParts[i] > partBParts[i]) {
                return 1
            }
            if (partAParts[i] < partBParts[i]) {
                return -1
            }
        }
        return 0
    }

    // It goes number, string, number, string. If it doesn't exist, then
    // 0 for numbers, empty string for strings.
    function parseVersionPart (part) {
        if (!part) {
            return [0, '', 0, '']
        }
        const partParts = /([0-9]*)([^0-9]*)([0-9]*)([^0-9]*)/.exec(part)
        return [
            partParts[1] ? parseInt(partParts[1]) : 0,
            partParts[2],
            partParts[3] ? parseInt(partParts[3]) : 0,
            partParts[4]
        ]
    }

    function handleInstallResult (installButton, installedVersion, version) {
        if (installedVersion == null) {
            // Not installed, do nothing
            return
        }

        installButton.removeAttribute('data-ping-url')

        switch (compareVersions(installedVersion, version)) {
        // Upgrade
        case -1:
            installButton.textContent = installButton.getAttribute('data-update-label')
            break
            // Downgrade
        case 1:
            installButton.textContent = installButton.getAttribute('data-downgrade-label')
            break
            // Equal
        case 0:
            installButton.textContent = installButton.getAttribute('data-reinstall-label')
            break
        }
    }

    function checkForUpdatesJS (installButton, retry) {
        const name = installButton.getAttribute('data-script-name')
        const namespace = installButton.getAttribute('data-script-namespace')
        const version = installButton.getAttribute('data-script-version')

        getInstalledVersion(name, namespace).then(function (installedVersion) {
            handleInstallResult(installButton, installedVersion, version)
        }, function () {
            if (retry) {
                setTimeout(function () { checkForUpdatesJS(installButton, false) }, 1000)
            }
        })
    }

    function checkForUpdatesCSS (installButton) {
        const name = installButton.getAttribute('data-script-name')
        const namespace = installButton.getAttribute('data-script-namespace')
        postMessage({ type: 'style-version-query', name, namespace, url: location.href }, location.origin)
    }

    // Response from Stylus
    // window.addEventListener('message', function (event) {
    //     if (event.origin !== 'https://greasyfork.org' && event.origin !== 'https://sleazyfork.org') { return }

    //     if (event.data.type !== 'style-version') { return }

    //     const installButton = document.querySelector('.install-link[data-install-format=css]')
    //     if (installButton == null) { return }

    //     const version = installButton.getAttribute('data-script-version')

    //     const installedVersion = event.data.version

    //     handleInstallResult(installButton, installedVersion, version)
    // }, false)

    // document.addEventListener('DOMContentLoaded', function () {
    //     const installButtonJS = document.querySelector('.install-link[data-install-format=js]')
    //     if (installButtonJS) {
    //         checkForUpdatesJS(installButtonJS, true)
    //     }
    //     const installButtonCSS = document.querySelector('.install-link[data-install-format=css]')
    //     if (installButtonCSS) {
    //         checkForUpdatesCSS(installButtonCSS)
    //     }
    // })

    if (!window.checkVersion) {
        window.checkVersion = {
            getTampermonkey,
            getViolentmonkey,
            getInstalledVersion,
            compareVersions,
            compareVersionPart,
            parseVersionPart,
            handleInstallResult,
            checkForUpdatesJS,
            checkForUpdatesCSS
        }
    }
})()