admin: Start compute flag stats

admin/api/exercice.go

@@ -62,6 +62,7 @@ func declareExercicesRoutes(router *gin.RouterGroup) {
 	apiFlagsRoutes.POST("/try", tryExerciceFlag)
 	apiFlagsRoutes.DELETE("/", deleteExerciceFlag)
 	apiFlagsRoutes.GET("/dependancies", showExerciceFlagDeps)
+	apiFlagsRoutes.GET("/statistics", showExerciceFlagStats)
 	apiFlagsRoutes.GET("/choices/", listFlagChoices)
 	apiFlagsChoicesRoutes := apiExercicesRoutes.Group("/choices/:cid")
 	apiFlagsChoicesRoutes.Use(FlagChoiceHandler)
@@ -852,6 +853,34 @@ func showExerciceFlagDeps(c *gin.Context) {
 	c.JSON(http.StatusOK, deps)
 }
 
+func showExerciceFlagStats(c *gin.Context) {
+	exercice := c.MustGet("exercice").(*fic.Exercice)
+	flag := c.MustGet("flag-key").(*fic.FlagKey)
+
+	history, err := exercice.GetHistory()
+	if err != nil {
+		log.Println("Unable to getExerciceHistory:", err.Error())
+		c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": "An error occurs when retrieving exercice history"})
+		return
+	}
+
+	var completed, tries, nteams int64
+
+	for _, hline := range history {
+		if hline["kind"].(string) == "flag_found" {
+			if *hline["secondary"].(*int) == flag.Id {
+				completed += 1
+			}
+		}
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"completed": completed,
+		"tries":     tries,
+		"nteams":    nteams,
+	})
+}
+
 func tryExerciceFlag(c *gin.Context) {
 	flag := c.MustGet("flag-key").(*fic.FlagKey)