hip2-server/README.md

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# HIP2-server
## Derive new receive address from xpub with every request
### Configuration
#### Get your wallet account's XPUB
It's reccomended to create a new wallet for your HIP2 server.
https://hsd-dev.org/api-docs/#get-account-information
##### hsd
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`hsw-cli --id=<WALLET NAME> account get default | jq -r .accountKey`
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##### Bob Wallet
- Get your API key from Settings > Wallet then use hs-client:
`hsw-cli --id=<WALLET NAME> --api-key=<API KEY> account get default | jq -r .accountKey`
##### Paste the xpub by itself into the file in this repo: `conf/xpub`
### Installation & Execution
This package has been pre-built from hsd modules and requires no additional
packages or C compiler, etc. Just run the build with a port number
```
git clone https://github.com/pinheadmz/hip2-server
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cd hip2-server
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node hip2-server/build/hip2-server.js 8080
```
Check:
```
--> curl 127.0.0.1:8080
hs1q9f5d5jzhqynzamca4g8arm8qv8s9sc9lly7h7d
--> curl 127.0.0.1:8080
hs1q7z7w94kwja70qfwav0vxzfff0mk653jrllcq7y
--> curl 127.0.0.1:8080
hs1q22rl34g6s8f2druz2v7wvrlq39g8d0satydzz7
```
HIP2-server will track the number of requests in the file `log/hip2-index`.
This value may be needed to fully recover all payments made to your account
since many users may make requests without sending payments.
### NGINX
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If you are using nginx as your webserver, you can configure one or even many
domains to use the same HIP2 server, and even redirect to a hard-coded flat
file (with single HNS address) in case the HIP2 server crashes!
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In this example, port `60000` is the nodeJS webserver actually running the
`proofofconcept` website, which has a [hard-coded HIP2 address](https://github.com/pinheadmz/proofofconcept/blob/master/html/.well-known/wallets/HNS).
By using the `proxy_pass` and `error_page` directives in the nginx configuration,
the HIP2 address will by default come from HIP2-server but fall back to the flat
file in case of failure.
```
server {
server_name *.proofofconcept proofofconcept;
listen 443 ssl;
listen [::]:443 ssl;
ssl_certificate /root/ssl/proofofconcept/cert.crt;
ssl_certificate_key /root/ssl/proofofconcept/cert.key;
location / {
proxy_pass http://localhost:60000;
proxy_set_header Host $host;
}
location @main {
proxy_pass http://localhost:60000;
proxy_set_header Host $host;
}
location /.well-known/wallets/HNS {
proxy_pass http://localhost:20000;
error_page 500 502 @main;
}
}
```
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### Build from source
Don't trust my build? fine. Requires C compiler and whatever else `hsd` wants.
```
git clone https://github.com/pinheadmz/hip2-server
cd hip2-server
npm install
npm run build
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```
### Wallet recovery and pitfalls
The default `lookahead` value in hsd is 200. That means that if at least one
out of every 200 HIP2 address requests results in an on-chain transaction,
the original wallet (or new wallet rescanning from the original seed) will
recover all payments. Users should monitor the value saved to `log/hip2-index`
and if it gets too large you may need to manually generate addresses in the
recovery wallet before rescanning. After the hip2-server serves `0x7fffffff`
addresses, it will start over at index `0` and recycle. The `log/hip2-index`
file will continue to increment, so users should also take action if they see
the value in that file exceed `2147483647`.
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### Docker (experimental)
```
sudo docker build -t hip2-server .
sudo docker run -p 3000:3000 -v ~/Downloads/xpub:/app/conf/xpub hip2-server
```