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Configurable Extra connect-src CSP Origins #1599

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Configurable Extra connect-src CSP Origins #1599

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16 changes: 16 additions & 0 deletions api/nginx.conf.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,22 @@ if (url.hostname === 'localhost') {
'connect-src': [`'self'`]
}

// Optional space-separated extra connect-src origins so a deployment can
// authorize plugins that consume an external data feed (e.g. a public
// websocket API) without editing this file or forking the image.
// Example: CSP_CONNECT_SRC='wss://ws1.blitzortung.org wss://*.example.com'
// Only conservative source-expression characters are accepted so a
// malformed value cannot break out of the quoted header.
if (process.env.CSP_CONNECT_SRC) {
for (const src of process.env.CSP_CONNECT_SRC.split(/\s+/).filter(Boolean)) {
if (/^[A-Za-z0-9*.:/-]+$/.test(src)) {
csp['connect-src'].push(src);
} else {
console.error(`CSP_CONNECT_SRC: ignoring invalid source "${src}"`);
}
}
}

cspstr = `add_header 'Content-Security-Policy' "`
for (const [key, value] of Object.entries(csp)) {
console.error(key, value);
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