MORE REFACTORING!! + some improvements

Signed-off-by: ari melody <ari@arimelody.me>

music/music.go

@@ -0,0 +1,113 @@
+package music
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"arimelody.me/arimelody.me/admin"
+	"arimelody.me/arimelody.me/global"
+)
+
+// HTTP HANDLER METHODS
+
+func ServeCatalog() http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        releases := []Release{}
+        authorised := r.Context().Value("role") != nil && r.Context().Value("role") == "admin"
+        for _, release := range Releases {
+            if !release.IsReleased() && !authorised {
+                continue
+            }
+            releases = append(releases, release)
+        }
+
+        global.ServeTemplate("music.html", Releases).ServeHTTP(w, r)
+    })
+}
+
+func ServeGateway() http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        if r.URL.Path == "/" {
+            http.Redirect(w, r, "/music", http.StatusPermanentRedirect)
+            return
+        }
+
+        id := r.URL.Path[1:]
+        release := GetRelease(id)
+        if release == nil {
+            http.NotFound(w, r)
+            return
+        }
+
+        // only allow authorised users to view unreleased releases
+        authorised := r.Context().Value("role") != nil && r.Context().Value("role") == "admin"
+        if !release.IsReleased() && !authorised {
+            admin.MustAuthorise(ServeGateway()).ServeHTTP(w, r)
+            return
+        }
+
+        lrw := global.LoggingResponseWriter{w, http.StatusOK}
+
+        global.ServeTemplate("music-gateway.html", release).ServeHTTP(&lrw, r)
+
+        if lrw.Code != http.StatusOK {
+            fmt.Printf("Error loading music gateway for %s\n", id)
+            return
+        }
+    })
+}
+
+func ServeArtwork() http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        if r.URL.Path == "/" {
+            http.NotFound(w, r)
+            return
+        }
+
+        if !strings.HasSuffix(r.URL.Path, ".png") {
+            http.NotFound(w, r)
+            return
+        }
+
+        releaseID := r.URL.Path[1:len(r.URL.Path) - 4]
+        var release = GetRelease(releaseID)
+        if release == nil {
+            http.NotFound(w, r)
+            return
+        }
+
+        // only allow authorised users to view unreleased releases
+        authorised := r.Context().Value("role") != nil && r.Context().Value("role") == "admin"
+        if !release.IsReleased() && !authorised {
+            admin.MustAuthorise(ServeArtwork()).ServeHTTP(w, r)
+            return
+        }
+
+        fp := filepath.Join("data", "music-artwork", releaseID + ".png")
+        info, err := os.Stat(fp)
+        if err != nil {
+            if os.IsNotExist(err) {
+                http.NotFound(w, r)
+                return
+            }
+        }
+        length := info.Size()
+
+        file, err := os.Open(fp)
+        if err != nil {
+            http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+            return
+        }
+        defer file.Close()
+
+        var bytes = make([]byte, length)
+        file.Read(bytes)
+
+        w.Header().Add("Content-Type", "image/png")
+        w.WriteHeader(http.StatusOK)
+        w.Write(bytes)
+    })
+}