Ghost blog is now hosted on main domain

Hi @ribice

Here are the steps:

1. Setup ghost blog on alternativeDomain.com or alternativeSubdomain.domain.com

2. Add Cloudflare Worker script (provided below)

3. Change your ghost installation url using cli to where you want to show it, example:

ghost config url https://preferredSite.com/blog/

Then restart ghost

4. Go to Cloudflare, open your domain, go to Workers tab, and add a route, example:

https://preferredSite.com/blog/* -> to your cloudflare worker script

Make sure the domain preferredSite.com is "orange" on the DNS tab, so proxied by Cloudflare, so that Cloudflare can manipulate the traffic.

5. You can now access your ghost at:

• Public url: https://preferredSite.com/blog/
• Ghost admin panel: https://alternativeDomain.com/blog/ghost/ or https://alternativeSubdomain.domain.com/blog/ghost/

Here is the Edge worker script, replace "alternativeDomain.com" & "preferredSite.com":

// Website you intended to retrieve for users.
const upstream = 'alternativeDomain.com'

// Custom pathname for the upstream website.
const upstream_path = '/'

// Website you intended to retrieve for users using mobile devices.
const upstream_mobile = 'alternativeDomain.com'

// Countries and regions where you wish to suspend your service.
const blocked_region = []

// IP addresses which you wish to block from using your service.
const blocked_ip_address = []

// Whether to use HTTPS protocol for upstream address.
const https = true

// Whether to disable cache.
const disable_cache = false

// Replace texts.
const replace_dict = {
    '$upstream': '$custom_domain',
    '//alternativeDomain.com': ''
}

addEventListener('fetch', event => {
    event.respondWith(fetchAndApply(event.request));
})

async function fetchAndApply(request) {

    const region = request.headers.get('cf-ipcountry').toUpperCase();
    const ip_address = request.headers.get('cf-connecting-ip');
    const user_agent = request.headers.get('user-agent');

    let response = null;
    let url = new URL(request.url);
    let url_hostname = url.hostname;

    if (https == true) {
        url.protocol = 'https:';
    } else {
        url.protocol = 'http:';
    }

    if (await device_status(user_agent)) {
        var upstream_domain = upstream;
    } else {
        var upstream_domain = upstream_mobile;
    }

    url.host = upstream_domain;
    if (url.pathname == '/') {
        url.pathname = upstream_path;
    } else {
        url.pathname = upstream_path + url.pathname;
    }

    if (blocked_region.includes(region)) {
        response = new Response('Access denied: WorkersProxy is not available in your region yet.', {
            status: 403
        });
    } else if (blocked_ip_address.includes(ip_address)) {
        response = new Response('Access denied: Your IP address is blocked by WorkersProxy.', {
            status: 403
        });
    } else {
        let method = request.method;
        let request_headers = request.headers;
        let new_request_headers = new Headers(request_headers);

        new_request_headers.set('Host', upstream_domain);
        new_request_headers.set('Referer', url.protocol + '//' + url_hostname);

        let original_response = await fetch(url.href, {
            method: method,
            headers: new_request_headers
        })

        let original_response_clone = original_response.clone();
        let original_text = null;
        let response_headers = original_response.headers;
        let new_response_headers = new Headers(response_headers);
        let status = original_response.status;
    	
	    if (disable_cache) {
    		new_response_headers.set('Cache-Control', 'no-store');
        }

        new_response_headers.set('Access-Control-Allow-Origin', 'https://*.preferredSite.com');
        new_response_headers.set('Vary', 'Origin');
        new_response_headers.set('Host', 'alternativeDomain.com');
        new_response_headers.set('X-Ghost-Host', 'alternativeDomain.com');
        new_response_headers.set('X-Forwarded-host', 'preferredSite.com');
        new_response_headers.set('X-Forwarded-Proto', 'https');
        new_response_headers.set('X-Forwarded-For', ip_address);
        new_response_headers.delete('X-Frame-Options');

    	
        if(new_response_headers.get("x-pjax-url")) {
            new_response_headers.set("x-pjax-url", response_headers.get("x-pjax-url").replace("//" + upstream_domain, "//" + url_hostname));
        }
    	
        const content_type = new_response_headers.get('content-type');
        if (content_type != null && content_type.includes('text/html') && content_type.includes('UTF-8')) {
            original_text = await replace_response_text(original_response_clone, upstream_domain, url_hostname);
        } else {
            original_text = original_response_clone.body
        }
    	
        response = new Response(original_text, {
            status,
            headers: new_response_headers
        })
    }
    return response;
}

async function replace_response_text(response, upstream_domain, host_name) {
    let text = await response.text()

    var i, j;
    for (i in replace_dict) {
        j = replace_dict[i]
        if (i == '$upstream') {
            i = upstream_domain
        } else if (i == '$custom_domain') {
            i = host_name
        }

        if (j == '$upstream') {
            j = upstream_domain
        } else if (j == '$custom_domain') {
            j = host_name
        }

        let re = new RegExp(i, 'g')
        text = text.replace(re, j);
    }
    return text;
}


async function device_status(user_agent_info) {
    var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < agents.length; v++) {
        if (user_agent_info.indexOf(agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

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Disclaimer: Using this config your ghost is proxied to a path, but I didn't succeed in getting the members functionality to work. The Send Magic Link fails with 400 Bad Request. This means no visitors can subscribe or login, admin panel is not affected.

I tested thoroughly and found this reverse proxy is the reason Send Magic Link doesn't work, it works fine before/while not reverse proxying.

If someone can solve this, let me know.