hermes/backend/api/controllers/v1/proxies/connections.go

package proxies

import (
	"fmt"
	"net/http"

	"git.terah.dev/imterah/hermes/backend/api/backendruntime"
	"git.terah.dev/imterah/hermes/backend/api/db"
	"git.terah.dev/imterah/hermes/backend/api/permissions"
	"git.terah.dev/imterah/hermes/backend/api/state"
	"git.terah.dev/imterah/hermes/backend/commonbackend"
	"github.com/charmbracelet/log"
	"github.com/gin-gonic/gin"
)

type ConnectionsRequest struct {
	Token string `validate:"required" json:"token"`
	Id    uint   `validate:"required" json:"id"`
}

type ConnectionDetailsForConnection struct {
	SourceIP   string `json:"sourceIP"`
	SourcePort uint16 `json:"sourcePort"`
	DestPort   uint16 `json:"destPort"`
}

type SanitizedConnection struct {
	ClientIP string `json:"ip"`
	Port     uint16 `json:"port"`

	ConnectionDetails *ConnectionDetailsForConnection `json:"connectionDetails"`
}

type ConnectionsResponse struct {
	Success bool                   `json:"success"`
	Data    []*SanitizedConnection `json:"data"`
}

func SetupGetConnections(state *state.State) {
	state.Engine.POST("/api/v1/forward/connections", func(c *gin.Context) {
		var req ConnectionsRequest

		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 := state.Validator.Struct(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{
				"error": fmt.Sprintf("Failed to validate body: %s", err.Error()),
			})

			return
		}

		user, err := state.JWT.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, "routes.visibleConn") {
			c.JSON(http.StatusForbidden, gin.H{
				"error": "Missing permissions",
			})

			return
		}

		var proxy db.Proxy
		proxyRequest := state.DB.DB.Where("id = ?", req.Id).First(&proxy)

		if proxyRequest.Error != nil {
			log.Warnf("failed to find proxy: %s", proxyRequest.Error.Error())

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": "Failed to find forward entry",
			})

			return
		}

		proxyExists := proxyRequest.RowsAffected > 0

		if !proxyExists {
			c.JSON(http.StatusBadRequest, gin.H{
				"error": "No forward entry found",
			})

			return
		}

		backendRuntime, ok := backendruntime.RunningBackends[proxy.BackendID]

		if !ok {
			log.Warnf("Couldn't fetch backend runtime from backend ID #%d", proxy.BackendID)

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": "Couldn't fetch backend runtime",
			})

			return
		}

		backendResponse, err := backendRuntime.ProcessCommand(&commonbackend.ProxyConnectionsRequest{})

		if err != nil {
			log.Warnf("Failed to get response for backend: %s", err.Error())

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": "Failed to get status response from backend",
			})

			return
		}

		switch responseMessage := backendResponse.(type) {
		case *commonbackend.ProxyConnectionsResponse:
			sanitizedConnections := []*SanitizedConnection{}

			for _, connection := range responseMessage.Connections {
				if connection.SourceIP == proxy.SourceIP && connection.SourcePort == proxy.SourcePort && proxy.DestinationPort == proxy.DestinationPort {
					sanitizedConnections = append(sanitizedConnections, &SanitizedConnection{
						ClientIP: connection.ClientIP,
						Port:     connection.ClientPort,

						ConnectionDetails: &ConnectionDetailsForConnection{
							SourceIP:   proxy.SourceIP,
							SourcePort: proxy.SourcePort,
							DestPort:   proxy.DestinationPort,
						},
					})
				}
			}

			c.JSON(http.StatusOK, &ConnectionsResponse{
				Success: true,
				Data:    sanitizedConnections,
			})
		default:
			log.Warnf("Got illegal response type for backend: %T", responseMessage)

			c.JSON(http.StatusInternalServerError, gin.H{
				"error": "Got illegal response type",
			})
		}
	})
}