# [GoServ](https://git.coolaj86.com/coolaj86/goserv)

!["golang gopher with goggles"](https://i.imgur.com/S2nhiRK.jpg)

> Boilerplate for how I like to write a backend web service

## Build

#### Goreleaser

See <https://webinstall.dev/goreleaser>

Local-only

```bash
goreleaser --snapshot --skip-publish --rm-dist
```

Publish

```bash
# Get a token at https://github.com/settings/tokens
export GITHUB_TOKEN=xxxxxxx

# Remove --snapshot to error on non-clean releases
goreleaser --snapshot --rm-dist
```

The platform, publish URL, and token file can be changed in `.goreleaser.yml`:

```yml
env_files:
    gitea_token: ~/.config/goreleaser/gitea_token
gitea_urls:
    api: https://try.gitea.io/api/v1/
```

#### Manually

```bash
git clone ssh://gitea@git.coolaj86.com:22042/coolaj86/goserv.git ./goserv
pushd ./goserv
bash ./examples/build.sh
```

```bash
export GOFLAGS="-mod=vendor"
go mod tidy
go mod vendor
go generate -mod=vendor ./...
go build -mod=vendor -o dist/goserv .
```

To build for another platform (such as Raspberry Pi) set `GOOS` and GOARCH`:

```bash
GOOS=linux GOARCH=arm64 go build -mod=vendor -o dist/goserv-linux-arm64 .
```

#### Run

```bash
./dist/goserv run --listen :3000 --trust-proxy --serve-path ./overrides
```

## Examples and Config Templates

The example files are located in `./examples`

-   Caddyfile (web server config)
-   .env (environment variables)
-   build.sh

```bash
export BASE_URL=https://example.com
```

### Authentication

You can use an OIDC provider or sign your own tokens.

```bash
go install -mod=vendor git.rootprojects.org/root/keypairs/cmd/keypairs

# Generate a keypair
keypairs gen -o key.jwk.json --pub pub.jwk.json
```

Create an Admin token:

```bash
# Sign an Admin token
echo '{ "sub": "random_ppid", "email": "me@example.com", "iss": "'"${BASE_URL}"'" }' \
    > admin.claims.json
keypairs sign --exp 1h ./key.jwk.json ./admin.claims.json > admin.jwt.txt 2> admin.jws.json

# verify the Admin token
keypairs verify ./pub.jwk.json ./admin.jwt.txt
```

Create a User token:

```bash
# Sign a User token
echo '{ "sub": "random_ppid", "email": "me@example.com", "iss": "'"${BASE_URL}"'" }' \
    > user.claims.json
keypairs sign --exp 1h ./key.jwk.json ./user.claims.json > user.jwt.txt 2> user.jws.json

# verify the User token
keypairs verify ./pub.jwk.json ./user.jwt.txt
```

**Impersonation** can be accomplished by appending the token `sub` (aka PPID) to the url as
`?user_id=`.

## REST API

All routes require authentication, except for those at `/api/public`.

```txt
Authentication: Bearer <token>
```

Here's the API, in brief:

Base URL looks like `https://example.com/api`.

```txt
# Demo Mode Only
DELETE /public/reset                                    Drop database and re-initialize

# Public
GET  /public/ping                                       Health Check
POST /public/setup                  <= (none)           Bootstrap

# Admin-only
GET  /admin/ping                                        (authenticated) Health Check

# User
GET  /user/ping                                         (authenticated) Health Check
```

When you `GET` anything, it will be wrapped in the `result`.

#### Bootstrapping

The first user to hit the `/api/setup` endpoint will be the **admin**:

```bash
export TOKEN=$(cat admin.jwt.txt)
```

```bash
curl -X POST "${BASE_URL}/api/public/setup" -H "Authorization: Bearer ${TOKEN}"
```

Then the setup endpoint will be disabled:

```bash
curl -X POST "${BASE_URL}/api/public/setup" -H "Authorization: Bearer ${TOKEN}"
```

## GoDoc

If the documentation is not public hosted you can view it with GoDoc:

```bash
godoc --http :6060
```

-   <http://localhost:6060/pkg/git.example.com/example/goserv/>
-   <http://localhost:6060/pkg/git.example.com/example/goserv/internal/api>
-   <http://localhost:6060/pkg/git.example.com/example/goserv/internal/db>

You can see abbreviated documentation with `go`'s built-in `doc`, for example:

```bash
go doc git.example.com/example/goserv/internal/api
```

<http://localhost:6060>

## Test

Create a test database. It must have `test` in the name.

```sql
DROP DATABASE "goserv_test"; CREATE DATABASE "goserv_test";
```

Run the tests:

```bash
export TEST_DATABASE_URL='postgres://postgres:postgres@localhost:5432/goserv_test'
go test -mod=vendor ./...
```

## Dependencies

This setup can be run on a VPS, such as Digital Ocean, OVH, or Scaleway
for \$5/month with minimal dependencies:

-   VPS
-   Caddy
-   PostgreSQL
-   Serviceman

**Mac**, **Linux**:

```bash
curl -fsS https://webinstall.dev | bash
export PATH="$HOME:/.local/bin:$PATH"
```

```bash
webi caddy serviceman postgres
```

### VPS Setup

You should have a domain pointing to a VPS and create a user account named `app`
(because that's a common convention). This script will create an `app` user,
copying the `authorized_keys` from the root account.

```bash
my_vps='example.com'
ssh root@"$my_vps" 'curl -sS https://webinstall.dev/ssh-adduser | bash'
```

You can then login as a normal user.

```bash
ssh app@"$my_vps"
```

It is now safe to disable the root account.

### Caddy (Automatic HTTPS Server)

```bash
curl -fsS https://webinstall.dev/caddy | bash
```

You can start Caddy as a system service under the app user like this:

```bash
sudo setcap 'cap_net_bind_service=+ep' "$(readlink $(command -v caddy))"

sudo env PATH="$PATH" \
    serviceman add --name caddy --username app \
    caddy run --config ./Caddyfile
```

See the Cheat Sheets at https://webinstall.dev/caddy
and https://webinstall.dev/serviceman

### PostgreSQL (Database)

```bash
curl -fsS https://webinstall.dev/postgres | bash
```

You can start Postgres as a system service under the app user like this:

```bash
sudo env PATH="$PATH" \
    serviceman add --name postgres --username app -- \
    postgres -D /home/app/.local/share/postgres/var -p 5432
```

Username and password are set to 'postgres' by default:

```bash
psql 'postgres://postgres:postgres@localhost:5432/postgres'
```

See the Cheat Sheets at https://webinstall.dev/postgres
and https://webinstall.dev/serviceman

## Licenses

Copyright 2020 The GoServ Authors. All rights reserved.

### Exceptions

-   `countries.json` LGPL, taken from <https://github.com/stefangabos/world_countries>
-   `flags.json` MIT, taken from <https://github.com/matiassingers/emoji-flags>

These are probably also in the Public Domain. \
(gathering the official data from any source would yield the same dataset)