Set base URL for TubeArchivist with Nginx

reverse-proxy.conf

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js_path "/etc/nginx/conf.d/";

js_import main from ta_filter.js;

js_set $body_hash main.get_hash;

server {

    location /multimedia/tubearchivist/ {

        rewrite ^/multimedia/tubearchivist(.*)$ $1 break;

        proxy_pass http://{{subnets.multimedia}}.0.14:8000;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_set_header X-Real-IP $remote_addr;

        proxy_set_header Host $http_host;

        proxy_set_header Accept-Encoding identity;

        proxy_redirect ~^(.*)$ /multimedia/tubearchivist$1;

        js_body_filter main.apply_base_url;

        add_trailer Body-Hash $body_hash;

    }

}

ta_filter.js

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var hash = "";

var res = "";

var buf = 0;

// Modify the response body using regular expressions

function apply_base_url(r, data, flags) {

    let requestUrl = r.uri;

    let fileExtension = getFileExtension(requestUrl)

    if (fileExtension === "" || fileExtension === "css" || fileExtension === "js") {

        // Replace URLs in API responses

        if (requestUrl.includes("/api/")) {

            data = data.replace(/("[^"\n\r\f\v]*"(?=\s*:):")(\/.*?")/g, '$1/multimedia/tubearchivist$2');

        } else {

            // Fix some hardcoded /api in JS scripts

            if (fileExtension === "js") {

                data = data.replace(/`(\/api.*)/g, '`/multimedia/tubearchivist$1');

            }

            data = data.replace(/(src|href|action)=["'](\/.*?)["']/g, '$1="/multimedia/tubearchivist$2"');

            data = data.replace(/'(\/.*)'/g, '\'/multimedia/tubearchivist$1\'');

        }

    }

    if (data.length) buf++;

    res += data; // Collect the entire response,

    if (flags.last) { //  until we get the last byte.

        try {

            hash = require('crypto').createHash('sha1').update(res).digest('base64');

            r.sendBuffer(res, flags);

            ngx.log(ngx.INFO, `FILTERED ${res.length} bytes in ${buf} buffers`);

        } catch (e) {

            ngx.log(ngx.ERR, `ERROR ${e}`);

            r.sendBuffer("", flags);

        }

    }

}

// Extract the file extension from the URL

function getFileExtension(url) {

    let match = url.match(/\.([a-z0-9]+)(?:[\?#]|$)/i);

    return match ? match[1].toLowerCase() : '';

}

function get_hash() {

    return hash;

}

export default {

    apply_base_url,

    get_hash

}