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158 lines
5.5 KiB
Markdown
158 lines
5.5 KiB
Markdown
# noxy is a nostr proxy
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noxy proxies URL preview metadata, images and other media files.
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the idea is to run such proxies to reduce IP address leaks and client
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fingerprinting.
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to limit noxy abuse, it works only with URLs linked to
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from [nostr](https://nostr.info/) events. the following nostr event kinds
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are currently supported:
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- 0: `set_metadata`; `picture` URL
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- 1: `text_note`; any URL in the `content`
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- 40: create channel; `picture` URL
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- 41: set channel metadata; `picture` URL
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- 42: channel message; any URL in the `content`
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## API
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over HTTP, noxy exposes two endpoints: one for meta info of URL preview,
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and the other one for file (data) transfer.
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### /meta
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the request has the following form. all parameter values are expected to be
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url-encoded.
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GET /meta?id=<nostr-event-id>&relay=<relay-uri>&url=<original-url>
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the parameters are:
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- `id`: nostr event id as described in [NIP-01](https://github.com/nostr-protocol/nips/blob/master/01.md)
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- `relay`: a URL of a nostr relay where the event was posted to
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- `url`: any URL found in the event text note or the `picture` for structured messages
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noxy fetches HTML at `url`, looks for [OGP](https://ogp.me/) metadata
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and responds with a JSON object containing the following keys:
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```json
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{
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"type": "<OGP type>",
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"title": "<OGP title>",
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"descr": "<OGP description>",
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"images": ["<URL>", ...]
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}
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```
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where image URLs are taken from `og:image:secure_url` or `og:image`; the former
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is preferred. other fields are copied verbatim from `og:type`, `og:title`
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and `og:description`, respectively. future versions may also employ
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[oEmbed](https://oembed.com/) and other metadata formats parsing.
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the web page at `url` must be served with `text/html` content type. if the page
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contains no or empty OGP metadata, noxy responds with 200 OK and blank fields.
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otherwise, the response is a 4xx status code.
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### /data
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data endpoint request is of the following form. all parameter values are
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expected to be url-encoded.
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GET /data?id=<nostr-event-id>&relay=<relay-uri>&url=<file-url>
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the parameters are:
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- `id`: a nostr event id
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- `relay`: a URL of a nostr relay where the event was posted to
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- `url`: any URL found either in the event text note, `picture` field for
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structured messages, or an `images` array element of a `/meta` endpoint response
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produced from the same event id.
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the data endpoint simply streams contents at the `url` to the client
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with the same `content-type` as the original. `content-length` may or may
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not be present. in the latter case, the response is chunked.
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### example: fetch a pubkey profile picture, event kind 0
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$ eventid=e01ac1cfc5cb68b54183f878261b21ef30a65f5e06a24356cfe3ecdacce14bae
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$ relay=wss://relay.nostr.info
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$ url=https://git.qcode.ch/avatars/5a8071777eba7ebf178143fa650c8012?size=870
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$ curl -o /tmp/img "https://noxy.nostr.ch/data?id=$eventid&relay=$relay&url=$url"
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$ file /tmp/img
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/tmp/img: PNG image data, 290 x 290, 16-bit/color RGB, non-interlaced
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[event raw data →](https://nostr.com/e/e01ac1cfc5cb68b54183f878261b21ef30a65f5e06a24356cfe3ecdacce14bae)
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### example: fetch images from a text note, event kind 1
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$ eventid=d822fdd220d8a74d2f025f331840eec8a640a663f1d3ca3de9f6a74ff0cc61fa
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$ relay=wss://relay.damus.io
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$ url=https://res.cloudinary.com/eskema/image/upload/v1668636521/osso_vt7qh7.png
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$ curl -o /tmp/img "https://noxy.nostr.ch/data?id=$eventid&relay=$relay&url=$url"
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$ file /tmp/img
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/tmp/img: PNG image data, 800 x 800, 8-bit/color RGB, non-interlaced
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[event raw data →](https://nostr.com/e/d822fdd220d8a74d2f025f331840eec8a640a663f1d3ca3de9f6a74ff0cc61fa)
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### example: fetch link preview from a text note, event kind 1
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$ EVENTID=af30dac1d800acc25b87d0d6d0dd33bddf49e7f356556540a6c7722e3cb363fe
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$ RELAY=wss://nostr.x1ddos.ch/
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$ URL=https://github.com/fiatjaf/noscl/pull/24
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$ curl "https://noxy.nostr.ch/meta?id=$EVENTID&relay=$RELAY&url=$URL"
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response:
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```json
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{
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"type": "object",
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"title": "publish,message: accept content from stdin by x1ddos · Pull Request #24 · fiatjaf/noscl",
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"descr": "if the arg to publish or message command is '-', it is read from stdin.\ncloses #19",
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"images": [
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"https://opengraph.githubassets.com/dc27bad9f4d71ea7803c4bd07a9991c0bcb798bbdc451aebc42d222e5d7692c8/fiatjaf/noscl/pull/24"
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]
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}
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```
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now, fetch the preview image. note the change from `/meta` to `/data` endpoint:
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$ URL=https://opengraph.githubassets.com/dc27bad9f4d71ea7803c4bd07a9991c0bcb798bbdc451aebc42d222e5d7692c8/fiatjaf/noscl/pull/24
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$ curl -o /tmp/img "https://noxy.nostr.ch/data?id=$EVENTID&relay=$RELAY&url=$URL"
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$ file /tmp/img
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/tmp/img: PNG image data, 1200 x 600, 8-bit/color RGBA, non-interlaced
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[event raw data →](https://nostr.com/e/af30dac1d800acc25b87d0d6d0dd33bddf49e7f356556540a6c7722e3cb363fe)
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## development
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the binary's entry point is [cmd/noxy/main.go](cmd/noxy/main.go).
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it imports packages in the root of the repo. the actual proxy is implemented
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by `Noxer` in [noxy.go](noxy.go).
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running the server locally:
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mkdir cache
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go run ./cmd/noxy -cachedir $PWD/cache
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before sending a patch, make sure the code is passing tests:
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go test -race
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files are formatted:
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go fmt ./...
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and the go module file is updated:
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go mod tidy
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## release
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a release binary is built using the following script.
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it produces `noxy` executable in the root of the repo.
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./tools/release.sh
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before making a new release, you'll probably want to create a new git tag.
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the tag is used as the noxy version, also printed when `-V` flag is specified.
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