zingolib

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An API and test-app that exposes zcash functionality for app consumption

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## Zingolib
[![license](https://img.shields.io/github/license/zingolabs/zingolib)](https://raw.githubusercontent.com/zingolabs/zingolib/dev/LICENSE) [![coverage](https://img.shields.io/endpoint?url=https://zingolabs.org/zingolib/coverage/badge.json)](https://zingolabs.org/zingolib/coverage/)
This repo provides both a library for zingo-mobile, as well as an included cli application to interact with the Zcash blockchain through a chain indexer.

# Security Vulnerability Disclosure

If you believe you have discovered a security issue, please contact us at:

zingodisclosure@proton.me

## Zingo CLI
`zingo-cli` is a command line indexer client. To use it, see "compiling from source" below. Releases are currently only provisional, we will update the README as releases come out.

## Privacy
* While all the keys and transaction detection happens on the client, the server can learn what blocks contain your shielded transactions.
* The server also learns other metadata about you like your ip address etc...
* Also remember that t-addresses are publicly visible on the blockchain.
* Price information is retrieved from Gemini exchange.

### Note Management
Zingo-CLI does automatic note and utxo management, which means it doesn't allow you to manually select which address to send outgoing transactions from. It follows these principles:
* Defaults to sending shielded transactions, even if you're sending to a transparent address
* Can select funds from multiple shielded addresses in the same transaction
* Will automatically shield your sapling funds at the first opportunity
    * When sending an outgoing transaction to a shielded address, Zingo-CLI can decide to use the transaction to additionally shield your sapling funds (i.e., send your sapling funds to your own orchard address in the same transaction)
* Transparent funds are only spent via explicit shield operations

## Compiling from source

#### Pre-requisites
* Rust v1.90 or higher.
    * Run `rustup update` to get the latest version of Rust if you already have it installed
* Rustfmt
    * Run `rustup component add rustfmt` to add rustfmt
* Build Tools
    * Please install the build tools for your platform. On Ubuntu `sudo apt install build-essential gcc libsqlite3-dev`
* Protobuf Compiler
    * Please install the protobuf compiler for your platform. On Ubuntu `sudo apt install protobuf-compiler`
* cargo-make and cargo-nextest for reproducible local test runs
    * Run `cargo install cargo-make cargo-nextest`
```
git clone https://github.com/zingolabs/zingolib.git
cd zingolib
cargo build --release --package zingo-cli
./target/release/zingo-cli --data-dir /path/to/data_directory/
```

This will launch the interactive prompt. Type `help` to get a list of commands.

## Reproducible builds via StageX

A bootstrapped and reproducible build pipeline using StageX is included in this repo.
If you meet all the compatibility requirements, to create `zingo-cli`, you can run
`make` in the root directory. The resulting binary will be found in the `/build/`
directory, along with an OCI image in the form of a tar ball.

This image can be loaded into docker with the `make load` convenience script, and
contains the `zingo-cli` binary.

To run interactively with a custom server:
`docker run -it zingo-cli:latest ./zingo-cli --server https://zzz.stripest.online:443`

`zingo-cli` runs with several defaults. Importantly, these include a data-dir
with wallet file, which are created if they don't already exist:
a `wallets` dir in location where executable is run, containing the wallet
(`zingo-wallet.dat`) file. Other defaults inlcude setting the chain to mainnet,
using a default lightwallet server, using clearnet for price fetching, and not
executing commands prior to a complete chain sync.

Any `docker run` will initialize a wallet if there was none in the container, and
by default prints info and then help if no arguments are passed.

## Notes:
* If you want to run your own server, please see [zaino](https://github.com/zingolabs/zaino), and then run `./zingo-cli --server <your server's URI>`
* The default log file is in `~/.zcash/zingo-wallet.debug.log`. A default wallet is stored in `~/.zcash/zingo-wallet.dat`
* If a server is not specified, the default indexer/lightwallet server is "https://zec.rocks:443".

## Running in non-interactive mode:
You can also run `zingo-cli` in non-interactive mode by passing the command you want to run as an argument. For example, `zingo-cli addresses` will list all wallet addresses and exit.
If you need to sync the wallet first before running the command, use --waitsync argument. This is useful for example for `zingo-cli balance`.
Run `zingo-cli help` to see a list of all commands.

## Options
Here are some CLI arguments you can pass to `zingo-cli`. Please run `zingo-cli --help` for the full list.

* `--data-dir`: uses the specified path as data directory. This is required when not using the `--regtest` option.
    * Example: `./zingo-cli --data-dir /path/to/data_directory/` will use the provided directory to store `zingo-wallet.dat` and logs. If the provided directory does not exist, it will create it.
* `--waitsync`: Wait for sync before running a command in non-interactive mode or entering the command prompt in interactive mode.
    * Example: `./zingo-cli --data-dir /path/to/data_directory/ --waitsync balance`
* `--server`: Connect to a custom Zcash indexer server.
    * Example: `./zingo-cli --data-dir /path/to/data_directory/ --server 127.0.0.1:9067`
* `--seed`: Restore a wallet from a seed phrase. Note that this will fail if there is an existing wallet. Delete (or move) any existing wallet to restore from the 24-word seed phrase
* `--birthday`: Specify wallet birthday when restoring from seed. This is the earliest block height where the wallet has a transaction.
    * Example: `./zingo-cli --data-dir /path/to/data_directory/ --seed "twenty four words seed phrase" --birthday 1234567`
* `--recover`: Attempt to recover the seed phrase from a corrupted wallet

## Regtest
Please see `zingo-cli/README.md` for details of running zingo-cli in regtest mode with a local network.

## Testing
`run_workspace_tests.sh` script may be used as a helper to run all tests in one invocation.

zingolib

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