A very simple and janky HTTP proxy that allows regex-based edits on the content to filter out or hide some stuff.
Curtain can be fully configured using environment variables.
The URL that will be proxied.
Further configuration is provided using the other environment variables, as long as the same <LABEL> is used.
The path on which the proxied URL will be served.
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>.
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'
MIT