From 7baee5b892afcddb72a575282c6c8983d477ed44 Mon Sep 17 00:00:00 2001
From: Julio Capote <jcapote@gmail.com>
Date: Sat, 17 Dec 2022 16:19:49 -0500
Subject: introduce concept of registry, start of webfinger impl

---
 config/config.go       |  1 +
 http/server.go         | 19 ++++++++++++++-----
 main.go                |  4 +++-
 registry/registry.go   | 42 ++++++++++++++++++++++++++++++++++++++++++
 sample-config.toml     |  2 ++
 webfinger/webfinger.go | 13 +++++++++++++
 6 files changed, 75 insertions(+), 6 deletions(-)
 create mode 100644 registry/registry.go
 create mode 100644 webfinger/webfinger.go

diff --git a/config/config.go b/config/config.go
index 2d63026..84024d7 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,6 +1,7 @@
 package config
 
 type Config struct {
+	Domain   string
 	Handlers []Handler
 }
 
diff --git a/http/server.go b/http/server.go
index 25c51d8..6d68d0e 100644
--- a/http/server.go
+++ b/http/server.go
@@ -4,13 +4,16 @@ import (
 	"io"
 	"net/http"
 
+	"git.capotej.com/capotej/communique/registry"
 	"github.com/gin-gonic/gin"
 )
 
-type Server struct{}
+type Server struct {
+	registry *registry.Registry
+}
 
-func NewServer() *Server {
-	return &Server{}
+func NewServer(registry *registry.Registry) *Server {
+	return &Server{registry: registry}
 }
 
 func (s *Server) Start(zapWriter io.Writer) {
@@ -20,8 +23,14 @@ func (s *Server) Start(zapWriter io.Writer) {
 	gin.DefaultWriter = zapWriter // send gin logs to zap
 
 	router.GET("/.well-known/webfinger", func(c *gin.Context) {
-		// resource := c.Query("resource")
-		c.JSON(http.StatusOK, nil)
+		resourceParam := c.Query("resource")
+		resource := s.registry.LookupResource(resourceParam)
+		if resource != nil {
+			c.JSON(http.StatusOK, resource)
+		} else {
+			c.JSON(http.StatusNotFound, nil)
+		}
+
 	})
 
 	router.Run()
diff --git a/main.go b/main.go
index 5935bc9..165cacb 100644
--- a/main.go
+++ b/main.go
@@ -6,6 +6,7 @@ import (
 	"git.capotej.com/capotej/communique/cgi"
 	"git.capotej.com/capotej/communique/config"
 	"git.capotej.com/capotej/communique/http"
+	"git.capotej.com/capotej/communique/registry"
 	"github.com/BurntSushi/toml"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapio"
@@ -26,6 +27,7 @@ func main() {
 		log.Fatal(err)
 	}
 	log.Debugf("Loaded TOML Config: %+v", cfg)
+	registry := registry.NewRegistry(cfg)
 
 	var mainWg sync.WaitGroup
 
@@ -37,7 +39,7 @@ func main() {
 	// External Http Server
 	writer := &zapio.Writer{Log: logger, Level: zap.DebugLevel}
 	defer writer.Close()
-	server := http.NewServer()
+	server := http.NewServer(registry)
 	mainWg.Add(1)
 	go server.Start(writer)
 
diff --git a/registry/registry.go b/registry/registry.go
new file mode 100644
index 0000000..04c4565
--- /dev/null
+++ b/registry/registry.go
@@ -0,0 +1,42 @@
+package registry
+
+import (
+	"fmt"
+
+	"git.capotej.com/capotej/communique/config"
+	"git.capotej.com/capotej/communique/webfinger"
+)
+
+type Handler struct {
+	handlerCfg config.Handler
+}
+
+type Registry struct {
+	cfg        config.Config
+	handlerMap map[string]Handler
+}
+
+func NewRegistry(cfg config.Config) *Registry {
+	reg := Registry{cfg: cfg}
+	reg.handlerMap = make(map[string]Handler)
+	for _, v := range cfg.Handlers {
+		fqdn := fmt.Sprintf("acct:%s@%s", v.Name, cfg.Domain)
+		reg.handlerMap[fqdn] = Handler{handlerCfg: v}
+	}
+	return &reg
+}
+
+func (r *Registry) LookupResource(name string) *webfinger.Resource {
+	handler, ok := r.handlerMap[name]
+	if !ok {
+		return nil
+	}
+	rs := webfinger.Resource{
+		Subject: fmt.Sprintf("acct:%s@%s", handler.handlerCfg.Name, "activitybub.xyz"),
+		Aliases: []string{},
+		Links: []webfinger.Link{{
+			Rel: "asd",
+		}},
+	}
+	return &rs
+}
diff --git a/sample-config.toml b/sample-config.toml
index 5f18cc0..2d0423f 100644
--- a/sample-config.toml
+++ b/sample-config.toml
@@ -1,3 +1,5 @@
+domain = "activitybub.xyz"
+
 [[handlers]]
 name = "sample"
 rpc = "cgi"
diff --git a/webfinger/webfinger.go b/webfinger/webfinger.go
new file mode 100644
index 0000000..8e43dd2
--- /dev/null
+++ b/webfinger/webfinger.go
@@ -0,0 +1,13 @@
+package webfinger
+
+type Link struct {
+	Rel  string `json:"rel"`
+	Type string `json:"type"`
+	Href string `json:"href"`
+}
+
+type Resource struct {
+	Subject string   `json:"subject"`
+	Aliases []string `json:"aliases"`
+	Links   []Link   `json:"links"`
+}
-- 
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