feat: Create v1 of handles-server using Go (#13)

Closes #12

.github/workflows/format.yaml

@@ -0,0 +1,25 @@
+name: Format
+
+on:
+  - push
+
+jobs:
+  golangci-lint:
+    name: Run golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: "go.mod"
+      - run: go build -v .
+      - uses: golangci/golangci-lint-action@v3
+  tidy:
+    name: Tidy go modules
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: "go.mod"
+      - uses: katexochen/go-tidy-check@v2

.github/workflows/test.yaml

@@ -0,0 +1,17 @@
+name: Test
+
+on:
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: "go.mod"
+      - name: Build
+        run: "go build -v ."
+      - name: Test
+        run: "go test -v ."

.gitignore

@@ -0,0 +1 @@
+handles-server

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Shrink Inc.
+
+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

@@ -0,0 +1,60 @@
+# Handles Server
+
+A very simple server that verifies Bluesky (atproto) handles using the
+[HTTPS well-known Method][atproto/resolution/well-known]; an alternative to
+managing many DNS records.
+
+## Implementation
+
+A `handle` is a hostname (e.g: `alice.example.com`) which the server may or may
+not be able to provide a Decentralized ID for. A handle is made up of a `domain`
+(e.g: `example.com`) and a `username` (e.g: `alice`). A provider
+(`ProvidesDecentralizedIDs`) is responsible for getting a Decentralized ID from
+a handle.
+
+## Providers
+
+- [x] Postgres
+- [x] Memory
+- [ ] Google Sheets
+- [ ] Filesystem
+
+## Configuration
+
+| Environment Variable       | Description                                        | Example                                |
+| -------------------------- | -------------------------------------------------- | -------------------------------------- |
+| **`DID_PROVIDER`**         | **Required** Name of a supported provider          | `postgres` `memory`                    |
+| `REDIRECT_DID_TEMPLATE`    | URL template for redirects when a DID is found     | `https://bsky.app/profile/{did}`       |
+| `REDIRECT_HANDLE_TEMPLATE` | URL template for redirects when a DID is not found | `https://example.com/?handle={handle}` |
+
+### `memory` provider
+
+| Environment Variable | Description                                           | Example                                                                   |
+| -------------------- | ----------------------------------------------------- | ------------------------------------------------------------------------- |
+| **`MEMORY_DIDS`**    | **Required** Comma separated list of handle@did pairs | `alice.example.com@did:plc:example001,bob.example.com@did:plc:example002` |
+| **`MEMORY_DOMAINS`** | **Required** Comma separate list of supported domains | `example.com,example.net`                                                 |
+
+### `postgres` provider
+
+| Environment Variable     | Description                            | Example                                      |
+| ------------------------ | -------------------------------------- | -------------------------------------------- |
+| **`DATABASE_URL`**       | **Required** Postgres database URL     | `postgres://postgres@localhost:5432/handles` |
+| `DATABASE_TABLE_DIDS`    | Table containing `handle` + `did` rows | `dids` `active_handles`                      |
+| `DATABASE_TABLE_DOMAINS` | Table containing `domain` rows         | `domains` `active_domains`                   |
+
+### URL templates
+
+A string containing zero or more tokens which are replaced when rendering.
+
+| Token               | Value                                           | Example(s)                 |
+| ------------------- | ----------------------------------------------- | -------------------------- |
+| `{handle}`          | Formatted handle from the request               | `alice.example.com`        |
+| `{did}`             | Decentralized ID found for the request's handle | `did:plc:example001` ` `   |
+| `{handle.domain}`   | Top level domain from the handle                | `example.com`              |
+| `{handle.username}` | Username part of the handle                     | `alice` `bob`              |
+| `{request.scheme}`  | Request's scheme                                | `https` `http`             |
+| `{request.host}`    | Request's host                                  | `alice.example.com`        |
+| `{request.path}`    | Path included in the request                    | `/hello-world` ` `         |
+| `{request.query}`   | Query included in the request                   | `greeting=Hello+World` ` ` |
+
+[atproto/resolution/well-known]: https://atproto.com/specs/handle#handle-resolution

Taskfile.dist.yaml

@@ -0,0 +1,39 @@
+version: "3"
+
+silent: true
+
+dotenv:
+  - "Taskfile.env.example"
+  - "Taskfile.env"
+
+tasks:
+  default:
+    cmds:
+      - task --list
+
+  run:
+    desc: "Run local development copy of the server"
+    cmds:
+      - go run .
+
+  test:
+    desc: "Run test suite"
+    cmds:
+      - go test . -v
+
+  format:
+    desc: "Format code"
+    deps:
+      - golang-ci
+    cmds:
+      - go fmt .
+      - golangci-lint run
+      - go mod tidy
+
+  golang-ci:
+    status:
+      - golangci-lint version && exit 0
+    cmds:
+      - >
+        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh |
+        sh -s -- -b $(go env GOPATH)/bin v1.53.3

Taskfile.env.example

@@ -0,0 +1,4 @@
+PORT=8888 
+LOG_LEVEL=debug 
+DATABASE_URL="postgres://postgres@localhost:5432/handles" 
+DID_PROVIDER="postgres" 

config.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"errors"
+	"log/slog"
+	"reflect"
+
+	"github.com/caarlos0/env/v11"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type Config struct {
+	Host     string     `env:"HOST" envDefault:"localhost"`
+	Port     string     `env:"PORT" envDefault:"80"`
+	LogLevel slog.Level `env:"LOG_LEVEL" envDefault:"error"`
+
+	RedirectDIDTemplate    URLTemplate `env:"REDIRECT_DID_TEMPLATE" envDefault:"https://bsky.app/profile/{did}"`
+	RedirectHandleTemplate URLTemplate `env:"REDIRECT_HANDLE_TEMPLATE" envDefault:"https://{handle.domain}?handle={handle}"`
+
+	Postgres             *pgxpool.Config `env:"DATABASE_URL"`
+	PostgresDidsTable    string          `env:"DATABASE_TABLE_DIDS" envDefault:"dids"`
+	PostgresDomainsTable string          `env:"DATABASE_TABLE_DOMAINS" envDefault:"domains"`
+
+	MemoryDids    map[string]string `env:"MEMORY_DIDS" envKeyValSeparator:"@"`
+	MemoryDomains []string          `env:"MEMORY_DOMAINS"`
+
+	Provider ProvidesDecentralizedIDs `env:"DID_PROVIDER,required"`
+}
+
+func ConfigFromEnvironment() (Config, error) {
+	config := Config{}
+
+	err := env.ParseWithOptions(&config, env.Options{
+		FuncMap: map[reflect.Type]env.ParserFunc{
+			reflect.TypeFor[slog.Level](): func(v string) (interface{}, error) {
+				var level slog.Level
+				return level, level.UnmarshalText([]byte(v))
+			},
+			reflect.TypeFor[pgxpool.Config](): func(v string) (interface{}, error) {
+				config, err := pgxpool.ParseConfig(v)
+				return *config, err
+			},
+			reflect.TypeFor[ProvidesDecentralizedIDs](): func(v string) (interface{}, error) {
+				switch v {
+				case "postgres":
+					if config.Postgres == nil {
+						return &PostgresHandles{}, errors.New("a database connection (`DATABASE_URL`) is required to use the postgres provider")
+					}
+
+					return NewPostgresHandlesProvider(
+						config.Postgres,
+						config.PostgresDidsTable,
+						config.PostgresDomainsTable,
+					)
+				case "memory":
+					if config.MemoryDids == nil || config.MemoryDomains == nil {
+						return nil, errors.New("a map of Decentralized IDs (`MEMORY_DIDS`) and domains (`MEMORY_DOMAINS`) is required to use the memory provider")
+					}
+
+					dids := make(MapOfDids)
+
+					for handle, did := range config.MemoryDids {
+						dids[Hostname(handle)] = DecentralizedID(did)
+					}
+
+					domains := make(MapOfDomains)
+
+					for _, domain := range config.MemoryDomains {
+						domains[Domain(domain)] = true
+					}
+
+					provider := NewInMemoryProvider(dids, domains)
+					return provider, nil
+				default:
+					return nil, errors.New("no valid provider of decentralized IDs specified")
+				}
+			},
+		},
+	})
+
+	if err != nil {
+		return Config{}, err
+	}
+
+	return config, nil
+}

go.mod

@@ -0,0 +1,50 @@
+module handles-server
+
+go 1.23.1
+
+require (
+	github.com/caarlos0/env/v11 v11.3.1
+	github.com/gin-gonic/gin v1.10.0
+	github.com/jackc/pgx/v5 v5.7.2
+	github.com/samber/slog-gin v1.14.1
+	github.com/stretchr/testify v1.10.0
+)
+
+require (
+	github.com/bytedance/sonic v1.11.9 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.4 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.0 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.13.1 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	go.opentelemetry.io/otel v1.29.0 // indirect
+	go.opentelemetry.io/otel/trace v1.29.0 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)