Add server config admin endpoint (#207)

* Add support for ending the inbound stream. Closes #191

* Add a simple success response to API requests

* Add server config admin endpoint

controllers/serverConfig.go

@@ -0,0 +1,40 @@
+package controllers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gabek/owncast/config"
+)
+
+// GetServerConfig gets the config details of the server
+func GetServerConfig(w http.ResponseWriter, r *http.Request) {
+	response := serverConfigAdminResponse{
+		InstanceDetails: config.Config.InstanceDetails,
+		FFmpegPath:      config.Config.GetFFMpegPath(),
+		WebServerPort:   config.Config.GetPublicWebServerPort(),
+		VideoSettings: videoSettings{
+			VideoQualityVariants:  config.Config.GetVideoStreamQualities(),
+			SegmentLengthSeconds:  config.Config.GetVideoSegmentSecondsLength(),
+			NumberOfPlaylistItems: config.Config.GetMaxNumberOfReferencedSegmentsInPlaylist(),
+		},
+		S3: config.Config.S3,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
+
+type serverConfigAdminResponse struct {
+	InstanceDetails config.InstanceDetails `json:"instanceDetails"`
+	FFmpegPath      string                 `json:"ffmpegPath"`
+	WebServerPort   int                    `json:"webServerPort"`
+	S3              config.S3              `json:"s3"`
+	VideoSettings   videoSettings          `json:"videoSettings"`
+}
+
+type videoSettings struct {
+	VideoQualityVariants  []config.StreamQuality `json:"videoQualityVariants"`
+	SegmentLengthSeconds  int                    `json:"segmentLengthSeconds"`
+	NumberOfPlaylistItems int                    `json:"numberOfPlaylistItems"`
+}