initial: api v1 draft

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2022 qcode.ch
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# noxy is a nostr proxy
+
+noxy receives a [nostr](https://nostr.info/) event id, fetches images and
+link previews, and returns the result in a JSON object. the idea is to run
+such proxies to reduce IP address leaks and client fingerprinting.
+
+## API v1
+
+there's a single endpoint accepting a nostr event id and relay to fetch the event from:
+
+    GET /api/v1/e/<event-id>?relay=<relay-uri>
+
+some examples follow.
+
+### fetch a pubkey profile picture, event kind 0
+
+
+request example:
+
+    GET /api/v1/e/e01ac1cfc5cb68b54183f878261b21ef30a65f5e06a24356cfe3ecdacce14bae?relay=wss%3A%2F%2Frelay.nostr.info
+
+response:
+
+```json
+{
+  "images": {
+    "https://git.qcode.ch/avatars/5a8071777eba7ebf178143fa650c8012?size=870": "https://noxy.example.org/abcdef/abcdef0123456789.png"
+  }
+}
+```
+
+[event raw data &rightarrow;](https://nostr.com/e/e01ac1cfc5cb68b54183f878261b21ef30a65f5e06a24356cfe3ecdacce14bae)
+
+if a noxy instance is unable to fetch the original, it responds with an empty object:
+
+```json
+{
+  "images": {}
+}
+```
+
+### fetch images from a text note, event kind 1
+
+request example:
+
+    GET /api/v1/e/d822fdd220d8a74d2f025f331840eec8a640a663f1d3ca3de9f6a74ff0cc61fa?relay=wss%3A%2F%2Frelay.damus.io
+
+response:
+
+```json
+{
+  "images": {
+    "https://res.cloudinary.com/eskema/image/upload/v1668636521/osso_vt7qh7.png": "https://noxy.example.org/fedcba/fedcba9876543210.png"
+  }
+}
+```
+
+[event raw data &rightarrow;](https://nostr.com/e/d822fdd220d8a74d2f025f331840eec8a640a663f1d3ca3de9f6a74ff0cc61fa)
+
+### fetch link preview from a text note, event kind 1
+
+request example:
+
+    GET /api/v1/e/af30dac1d800acc25b87d0d6d0dd33bddf49e7f356556540a6c7722e3cb363fe?relay=wss%3A%2F%2Fnostr.x1ddos.ch%2F
+
+response:
+
+```json
+{
+  "links": {
+    "https://github.com/fiatjaf/noscl/pull/24": {
+      "og:image": "https://opengraph.githubassets.com/dc27...92c8/fiatjaf/noscl/pull/24",
+      "og:image:alt": "if the  arg to publish or message command is '-', it is read from stdin.\ncloses #19",
+      "og:image:width": "1200",
+      "og:image:height": "600",
+      "og:site_name": "GitHub",
+      "og:type": "object",
+      "og:title": "publish,message: accept content from stdin by x1ddos · Pull Request #24 · fiatjaf/noscl",
+      "og:description": "if the  arg to publish or message command is '-', it is read from stdin.\ncloses #19"
+    }
+  },
+  "images": {
+    "https://opengraph.githubassets.com/dc27...92c8/fiatjaf/noscl/pull/24": "https://noxy.example.org/beef01/beef0123456789.png"
+  }
+}
+```
+
+[event raw data &rightarrow;](https://nostr.com/e/af30dac1d800acc25b87d0d6d0dd33bddf49e7f356556540a6c7722e3cb363fe)