最近在获取edge商店应用下载地址时遇到点麻烦，没有解决。转头去研究chrome商店的扩展下载地址，看到了大佬分享的方法，这里顺便记录一下。
首先进入chrome应用商店找到自己想要下载的应用，比如：
https://chrome.google.com/webstore/detail/adblocker-stop-ad-on-ever/gpbfjnhlnemfnhajnmkjicfmbagfbejm?hl=zh-CN
从URL地址端可以看到，其扩展ID是 gpbfjnhlnemfnhajnmkjicfmbagfbejm
下面是拼接规则：
https://clients2.google.com/service/update2/crx?response=redirect&prodversion=[PRODVERSION]&acceptformat=crx2,crx3&x=id%3D[EXTENSIONID]%26uc
- EXTENSIONID = 扩展ID（gpbfjnhlnemfnhajnmkjicfmbagfbejm）
- PRODVERSION = chrome版本。原文作者注明必须为：31.0.1609.0以上，这里可以实际通用填写为：9999.0.9999.0
- acceptformat = crx2,crx3 是2018年新增的，如没有则会响应 204 状态码，很多人的答案这里是没有的。
那么可以根据这个方法拼接得出如下地址：
https://clients2.google.com/service/update2/crx?response=redirect&prodversion=9999.0.9999.0&acceptformat=crx2,crx3&x=id%3Dgpbfjnhlnemfnhajnmkjicfmbagfbejm%26uc
这里有一个完整的拼接函数，可以参考一下：
function getPlatformInfo() {
var platformInfo = localStorage.getItem('platformInfo');
if (!platformInfo) {
return getPlatformInfoFallback();
}
platformInfo = JSON.parse(platformInfo);
// Firefox does not have nacl_arch.
if (!platformInfo.nacl_arch) {
platformInfo.nacl_arch = getPlatformInfoFallback().nacl_arch;
}
return platformInfo;
}
function getPlatformInfoFallback() {
var os;
var arch;
// For the definition of the navigator object, see Chromium's source code:
// third_party/WebKit/Source/core/page/NavigatorBase.cpp
// webkit/common/user_agent/user_agent_util.cc
// UA := "Mozilla/5.0 (%s) AppleWebKit/%d.%d (KHTML, like Gecko) %s Safari/%d.%d"
// ^^ ^^
// Platform + CPUinfo Product, Chrome/d.d.d.d
var ua = navigator.userAgent;
ua = ua.split('AppleWebKit')[0] || ua;
// After splitting, we get the next string:
// ua := "5.0 (%s) "
// The string in comments is the line with the actual definition in user_agent_util.cc,
// unless said otherwise.
if (ua.indexOf('Mac') >= 0) {
// "Intel Mac OS X %d_%d_%d",
os = 'mac';
} else if (ua.indexOf('Win') >= 0) {
// "Windows NT %d.%d%s",
os = 'win';
} else if (ua.indexOf('Android') >= 0) {
// Note: "Linux; " is preprended, so test Android before Linux
// "Android %s%s",
os = 'android';
} else if (ua.indexOf('CrOS') >= 0) {
// "CrOS "
// "%s %d.%d.%d",
os = 'cros';
} else if (ua.indexOf('BSD') >= 0) {
os = 'openbsd';
} else { // if (ua.indexOf('Linux') >= 0) {
os = 'linux';
}
if (/\barm/.test(ua)) {
arch = 'arm';
} else if (/[^.0-9]64(?![.0-9])/.test(ua)) {
// WOW64, Win64, amd64, etc. Assume 64-bit arch when there's a 64 in the string, not surrounded
// by dots or digits (this restriction is set to avoid matching version numbers)
arch = 'x86-64';
} else {
arch = 'x86-32';
}
return {
os: os,
arch: arch,
nacl_arch: arch
};
}
function get_crx_url(extensionID_or_url) {
var url;
var match = ows_pattern.exec(extensionID_or_url);
if (match) {
url = 'https://addons.opera.com/extensions/download/';
url += match[1];
url += '/';
return url;
}
match = amo_pattern.exec(extensionID_or_url);
if (match) {
return get_xpi_url(match[1], match[2]);
}
match = amo_file_version_pattern.exec(extensionID_or_url);
if (match) {
return 'https://' + match[1] + '/firefox/downloads/file/' + match[2] + (match[3] || '/addon.xpi');
}
// Chrome Web Store
match = get_extensionID(extensionID_or_url);
var extensionID = match ? match : extensionID_or_url;
if (!/^[a-z]{32}$/.test(extensionID)) {
return extensionID_or_url;
}
var platformInfo = getPlatformInfo();
// Omitting this value is allowed, but add it just in case.
// Source: https://cs.chromium.org/file:update_query_params.cc%20GetProdIdString
var product_id = isChromeNotChromium() ? 'chromecrx' : 'chromiumcrx';
// Channel is "unknown" on Chromium on ArchLinux, so using "unknown" will probably be fine for everyone.
var product_channel = 'unknown';
// As of July, the Chrome Web Store sends 204 responses to user agents when their
// Chrome/Chromium version is older than version 31.0.1609.0
var product_version = '9999.0.9999.0';
// Try to detect the Chrome version, and if it is lower than 31.0.1609.0, use a very high version.
// $1 = m.0.r.p // major.minor.revision.patch where minor is always 0 for some reason.
// $2 = m
// $3 = r
var cr_version = /Chrome\/((\d+)\.0\.(\d+)\.\d+)/.exec(navigator.userAgent);
if (cr_version && +cr_version[2] >= 31 && +cr_version[3] >= 1609) {
product_version = cr_version[1];
}
url = 'https://clients2.google.com/service/update2/crx?response=redirect';
url += '&os=' + platformInfo.os;
url += '&arch=' + platformInfo.arch;
url += '&os_arch=' + platformInfo.arch; // crbug.com/709147 - should be archName of chrome.system.cpu.getInfo
url += '&nacl_arch=' + platformInfo.nacl_arch;
url += '&prod=' + product_id;
url += '&prodchannel=' + product_channel;
url += '&prodversion=' + product_version;
url += '&acceptformat=crx2,crx3';
url += '&x=id%3D' + extensionID;
url += '%26uc';
return url;
}最后是这个答案的原文地址：https://stackoverflow.com/a/14099762