feature: Adds backend removal support.

backend/api/controllers/v1/backends/remove.go

@@ -0,0 +1,123 @@
+package backends
+
+import (
+	"fmt"
+	"net/http"
+
+	"git.terah.dev/imterah/hermes/api/backendruntime"
+	"git.terah.dev/imterah/hermes/api/dbcore"
+	"git.terah.dev/imterah/hermes/api/jwtcore"
+	"git.terah.dev/imterah/hermes/api/permissions"
+	"github.com/charmbracelet/log"
+	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
+)
+
+type BackendRemovalRequest struct {
+	Token     string `validate:"required"`
+	BackendID uint   `json:"id" validate:"required"`
+}
+
+func RemoveBackend(c *gin.Context) {
+	var req BackendRemovalRequest
+
+	if err := c.BindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": fmt.Sprintf("Failed to parse body: %s", err.Error()),
+		})
+
+		return
+	}
+
+	if err := validator.New().Struct(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
+		})
+
+		return
+	}
+
+	user, err := jwtcore.GetUserFromJWT(req.Token)
+
+	if err != nil {
+		if err.Error() == "token is expired" || err.Error() == "user does not exist" {
+			c.JSON(http.StatusForbidden, gin.H{
+				"error": err.Error(),
+			})
+
+			return
+		} else {
+			log.Warnf("Failed to get user from the provided JWT token: %s", err.Error())
+
+			c.JSON(http.StatusInternalServerError, gin.H{
+				"error": "Failed to parse token",
+			})
+
+			return
+		}
+	}
+
+	if !permissions.UserHasPermission(user, "backends.remove") {
+		c.JSON(http.StatusForbidden, gin.H{
+			"error": "Missing permissions",
+		})
+
+		return
+	}
+
+	var backend *dbcore.Backend
+	backendRequest := dbcore.DB.Where("id = ?", req.BackendID).Find(&backend)
+
+	if backendRequest.Error != nil {
+		log.Warnf("failed to find if backend exists or not: %s", backendRequest.Error)
+
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": "Failed to find if backend exists",
+		})
+
+		return
+	}
+
+	backendExists := backendRequest.RowsAffected > 0
+
+	if !backendExists {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": "Backend doesn't exist",
+		})
+
+		return
+	}
+
+	if err := dbcore.DB.Delete(backend).Error; err != nil {
+		log.Warnf("failed to delete backend: %s", err.Error())
+
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"error": "Failed to delete backend",
+		})
+
+		return
+	}
+
+	backendInstance, ok := backendruntime.RunningBackends[req.BackendID]
+
+	if ok {
+		err = backendInstance.Stop()
+
+		if err != nil {
+			log.Warnf("Failed to stop backend: %s", err.Error())
+
+			c.JSON(http.StatusInternalServerError, gin.H{
+				"error": "Backend deleted, but failed to stop",
+			})
+
+			delete(backendruntime.RunningBackends, req.BackendID)
+			return
+		}
+
+		delete(backendruntime.RunningBackends, req.BackendID)
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+	})
+}