feat(dashboard): add opengraph/oembed, Docker build

dashboard/.gitignore

@@ -1,2 +1,3 @@
 dist/
-node_modules/
+node_modules/
+dashboard

dashboard/go.mod

@@ -0,0 +1,5 @@
+module dashboard
+
+go 1.18
+
+require github.com/go-chi/chi v1.5.4 // indirect

dashboard/go.sum

@@ -0,0 +1,2 @@
+github.com/go-chi/chi v1.5.4 h1:QHdzF2szwjqVV4wmByUnTcsbIg7UGaQ0tPF2t5GcAIs=
+github.com/go-chi/chi v1.5.4/go.mod h1:uaf8YgoFazUOkPBG7fxPftUylNumIev9awIWOENIuEg=

dashboard/index.html

@@ -5,6 +5,7 @@
     <link rel="icon" href="./myriad.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>PluralKit | home</title>
+    <!-- extra data -->
     <link rel="stylesheet" href="/styles/generic.scss" />
     <link rel="stylesheet" href="/styles/dark.scss" />
     <link rel="stylesheet" href="/styles/light.scss" />

dashboard/main.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"embed"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/go-chi/chi"
+)
+
+//go:embed dist/*
+var fs embed.FS
+
+type entity struct {
+	AvatarURL   *string `json:"avatar_url"`
+	IconURL     *string `json:"icon_url"`
+	Description *string `json:"description"`
+	Color       *string `json:"color"`
+}
+
+var baseURL = "https://api.pluralkit.me/v2"
+
+var version = "dev"
+
+func main() {
+	r := chi.NewRouter()
+
+	r.Use(func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+			rw.Header().Set("X-PluralKit-Version", version)
+			next.ServeHTTP(rw, r)
+		})
+	})
+
+	r.NotFound(notFoundHandler)
+
+	r.Get("/profile/{type}/{id}", func(rw http.ResponseWriter, r *http.Request) {
+		defer func() {
+			if a := recover(); a != nil {
+				notFoundHandler(rw, r)
+				return
+			}
+		}()
+		createEmbed(rw, r)
+	})
+
+	http.ListenAndServe(":8080", r)
+}
+
+func notFoundHandler(rw http.ResponseWriter, r *http.Request) {
+	var data []byte
+	var err error
+
+	// lol
+	if strings.HasSuffix(r.URL.Path, ".js") {
+		data, err = fs.ReadFile("dist" + r.URL.Path)
+		rw.Header().Add("content-type", "application/javascript")
+	} else if strings.HasSuffix(r.URL.Path, ".css") {
+		data, err = fs.ReadFile("dist" + r.URL.Path)
+		rw.Header().Add("content-type", "text/css")
+	} else if strings.HasSuffix(r.URL.Path, ".map") {
+		data, err = fs.ReadFile("dist" + r.URL.Path)
+	} else {
+		data, err = fs.ReadFile("dist/index.html")
+		rw.Header().Add("content-type", "text/html")
+		data = []byte(strings.Replace(string(data), `<!-- extra data -->`, "", 1))
+	}
+
+	if err != nil {
+		panic(err)
+	}
+
+	rw.Write(data)
+}
+
+// explanation for createEmbed:
+// we don't care about errors, we just want to return a HTML page as soon as possible
+// `panic(nil)` is caught by upstream, which then returns the raw HTML page
+
+func createEmbed(rw http.ResponseWriter, r *http.Request) {
+	entityType := chi.URLParam(r, "type")
+	id := chi.URLParam(r, "id")
+
+	var path string
+
+	switch entityType {
+	case "s":
+		path = "/systems/" + id
+	case "m":
+		path = "/members/" + id
+	case "g":
+		path = "/groups/" + id
+	default:
+		panic(nil)
+	}
+
+	res, err := http.Get(baseURL + path)
+	if err != nil {
+		panic(nil)
+	}
+	if res.StatusCode != 200 {
+		panic(nil)
+	}
+
+	var data entity
+	body, _ := io.ReadAll(res.Body)
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		panic(nil)
+	}
+
+	text := fmt.Sprintf(`<link type="application/json+oembed" href="%s/%s/oembed.json" />%s`, baseURL, path, "\n")
+
+	if data.AvatarURL != nil {
+		text += fmt.Sprintf(`<meta content='%s' property='og:image'>%s`, *data.AvatarURL, "\n")
+	} else if data.IconURL != nil {
+		text += fmt.Sprintf(`<meta content='%s' property='og:image'>%s`, *data.IconURL, "\n")
+	}
+
+	if data.Description != nil {
+		text += fmt.Sprintf(`<meta content="%s" property="og:description">%s`, *data.Description, "\n")
+	}
+
+	if data.Color != nil {
+		text += fmt.Sprintf(`<meta name="theme-color" content="#%s">%s`, *data.Color, "\n")
+	}
+
+	html, err := fs.ReadFile("dist/index.html")
+	if err != nil {
+		panic(nil)
+	}
+	html = []byte(strings.Replace(string(html), `<!-- extra data -->`, text, 1))
+
+	rw.Header().Add("content-type", "text/html")
+	rw.Write(html)
+}