Curtain Proxy 🙈🪟

A very simple and janky HTTP proxy that allows regex-based edits on the content to filter out or hide some stuff.

Configuration

Curtain can be fully configured using environment variables.

CURTAIN_URL_<LABEL>

The URL that will be proxied. Further configuration is provided using the other environment variables, as long as the same <LABEL> is used.

CURTAIN_PATH_<LABEL>

The path on which the proxied URL will be served.

CURTAIN_REGEX_<LABEL>_<NAME>

Allows to specify an sed-like regular expression to modify the proxy's response before returning it to the client. You can use more than regex rule for a single proxied resource, by setting different a <NAME> per rule. Each rule is applied in lexicographic order sorted by <NAME>.

Example

The following example shows a configuration for redacting an ical feed of a private calendar:

CURTAIN_URL_PRIVATE='https://example.com/calendar.ics?export'
CURTAIN_PATH_PRIVATE='/redacted.ics'
CURTAIN_REGEX_PRIVATE_SUMMARY='/^SUMMARY:[^\n]*(\n [^\n]*)*$/SUMMARY:/gm'
CURTAIN_REGEX_PRIVATE_LOCATION='/^LOCATION:[^\n]*(\n [^\n]*)*$/LOCATION:/gm'
CURTAIN_REGEX_PRIVATE_DESCRIPTION='/^DESCRIPTION:[^\n]*(\n [^\n]*)*$/DESCRIPTION:/gm'
CURTAIN_REGEX_PRIVATE_OTHER='/^X-[^\n]*(\n [^\n]*)*\n//gm'

License

MIT