feat(edge): introduce support for Edge agent (#3031)

* feat(edge): fix webconsole and agent deployment command

* feat(edge): display agent features when connected to IoT endpoint

* feat(edge): add -e CAP_HOST_MANAGEMENT=1 to agent command

* feat(edge): add -v /:/host and --name portainer_agent_iot to agent command

* style(endpoint-creation): refactor IoT agent to Edge agent

* refactor(api): rename AgentIoTEnvironment to AgentEdgeEnvironment

* refactor(api): rename AgentIoTEnvironment to AgentEdgeEnvironment

* feat(endpoint-creation): update Edge agent deployment instructions

* feat(edge): wip edge

* feat(edge): refactor key creation

* feat(edge): update deployment instructions

* feat(home): update Edge agent endpoint item

* feat(edge): support dynamic ports

* feat(edge): support sleep/wake and snapshots

* feat(edge): support offline mode

* feat(edge): host job support for Edge endpoints

* feat(edge): introduce STANDBY state

* feat(edge): update Edge agent deployment command

* feat(edge): introduce EDGE_ID support

* feat(edge): update default inactivity interval to 5min

* feat(edge): reload Edge schedules after restart

* fix(edge): fix execution of endpoint job against an Edge endpoint

* fix(edge): fix minor issues with scheduling UI/UX

* feat(edge): introduce EdgeSchedule version management

* feat(edge): switch back to REQUIRED state from ACTIVE on error

* refactor(edge): remove comment

* feat(edge): updated tunnel status management

* feat(edge): fix flickering UI when accessing Edge endpoint from home view

* feat(edge): remove STANDBY status

* fix(edge): fix an issue with console and Swarm endpoint

* fix(edge): fix an issue with stack deployment

* fix(edge): reset timer when applying active status

* feat(edge): add background ping for Edge endpoints

* fix(edge): fix infinite loading loop after Edge endpoint connection failure

* fix(home): fix an issue with merge

* feat(api): remove SnapshotRaw from EndpointList response

* feat(api): add pagination for EndpointList operation

* feat(api): rename last_id query parameter to start

* feat(api): implement filter for EndpointList operation

* fix(edge): prevent a pointer issue after removing an active Edge endpoint

* feat(home): front - endpoint backend pagination (#2990)

* feat(home): endpoint pagination with backend

* feat(api): remove default limit value

* fix(endpoints): fix a minor issue with column span

* fix(endpointgroup-create): fix an issue with endpoint group creation

* feat(app): minor loading optimizations

* refactor(api): small refactor of EndpointList operation

* fix(home): fix minor loading text display issue

* refactor(api): document bolt services functions

* feat(home): minor optimization

* fix(api): replace seek with index scanning for EndpointPaginated

* fix(api): fix invalid starting index issue

* fix(api): first implementation of working filter

* fix(home): endpoints list keeps backend pagination when it needs to

* fix(api): endpoint pagination doesn't drop the first item on pages >=2 anymore

* fix(home): UI flickering on page/filter load/change

* feat(auth): login spinner

* feat(api): support searching in associated endpoint group data

* refactor(api): remove unused API endpoint

* refactor(api): remove comment

* refactor(api): refactor proxy manager

* feat(api): declare EndpointList params as optional

* feat(api): support groupID filter on endpoints route

* feat(api): add new API operations endpointGroupAddEndpoint and endpointGroupDeleteEndpoint

* feat(edge): new icon for Edge agent endpoint

* fix(edge): fix missing exec quick action

* fix(edge): add loading indicator when connecting to Edge endpoint

* feat(edge): disable service webhooks for Edge endpoints

* feat(endpoints): backend pagination for endpoints view (#3004)

* feat(edge): dynamic loading for stack migration feature

* feat(edge): wordwrap edge key

* feat(endpoint-groups): backend pagination support for create and edit

* feat(endpoint-groups): debounce on filter for create/edit views

* feat(endpoint-groups): filter assigned on create view

* (endpoint-groups): unassigned endpoints edit view

* refactor(endpoint-groups): code clean

* feat(endpoint-groups): remove message for Unassigned group

* refactor(websocket): minor refactor associated to Edge agent

* feat(endpoint-group): enable backend pagination (#3017)

* feat(api): support groupID filter on endpoints route

* feat(api): add new API operations endpointGroupAddEndpoint and endpointGroupDeleteEndpoint

* feat(endpoint-groups): backend pagination support for create and edit

* feat(endpoint-groups): debounce on filter for create/edit views

* feat(endpoint-groups): filter assigned on create view

* (endpoint-groups): unassigned endpoints edit view

* refactor(endpoint-groups): code clean

* feat(endpoint-groups): remove message for Unassigned group

* refactor(api): endpoint group endpoint association refactor

* refactor(api): rename files and remove comments

* refactor(api): remove usage of utils

* refactor(api): optional parameters

* Merge branch 'feat-endpoint-backend-pagination' into edge

# Conflicts:
#	api/bolt/endpoint/endpoint.go
#	api/http/handler/endpointgroups/endpointgroup_update.go
#	api/http/handler/endpointgroups/handler.go
#	api/http/handler/endpoints/endpoint_list.go
#	app/portainer/services/api/endpointService.js

* fix(api): fix default tunnel server credentials

* feat(api): update endpointListOperation behavior and parameters

* fix(api): fix interface declaration

* feat(edge): support configurable Edge agent checkin interval

* feat(edge): support dynamic tunnel credentials

* feat(edge): update Edge agent deployment commands

* style(edge): update Edge agent settings text

* refactor(edge): remove unused credentials management methods

* feat(edge): associate a remote addr to tunnel credentials

* style(edge): update Edge endpoint icon

* feat(edge): support encrypted tunnel credentials

* fix(edge): fix invalid pointer cast

* feat(bolt): decode endpoints with jsoniter

* feat(edge): persist reverse tunnel keyseed

* refactor(edge): minor refactor

* feat(edge): update chisel library usage

* refactor(endpoint): use controller function

* feat(api): database migration to DBVersion 19

* refactor(api): refactor AddSchedule function

* refactor(schedules): remove comment

* refactor(api): remove comment

* refactor(api): remove comment

* feat(api): tunnel manager now only manage Edge endpoints

* refactor(api): clean-up and clarification of the Edge service

* refactor(api): clean-up and clarification of the Edge service

* fix(api): fix an issue with Edge agent snapshots

* refactor(api): add missing comments

* refactor(api): update constant description

* style(home): remove loading text on error

* feat(endpoint): remove 15s timeout for ping request

* style(home): display information about associated Edge endpoints

* feat(home): redirect to endpoint details on click on unassociated Edge endpoint

* feat(settings): remove 60s Edge poll frequency option

api/http/handler/endpoints/endpoint_create.go

@@ -1,8 +1,11 @@
 package endpoints
 
 import (
+	"errors"
 	"log"
+	"net"
 	"net/http"
+	"net/url"
 	"runtime"
 	"strconv"
 
@@ -41,7 +44,7 @@ func (payload *endpointCreatePayload) Validate(r *http.Request) error {
 
 	endpointType, err := request.RetrieveNumericMultiPartFormValue(r, "EndpointType", false)
 	if err != nil || endpointType == 0 {
-		return portainer.Error("Invalid endpoint type value. Value must be one of: 1 (Docker environment), 2 (Agent environment) or 3 (Azure environment)")
+		return portainer.Error("Invalid endpoint type value. Value must be one of: 1 (Docker environment), 2 (Agent environment), 3 (Azure environment) or 4 (Edge Agent environment)")
 	}
 	payload.EndpointType = endpointType
 
@@ -149,6 +152,8 @@ func (handler *Handler) endpointCreate(w http.ResponseWriter, r *http.Request) *
 func (handler *Handler) createEndpoint(payload *endpointCreatePayload) (*portainer.Endpoint, *httperror.HandlerError) {
 	if portainer.EndpointType(payload.EndpointType) == portainer.AzureEnvironment {
 		return handler.createAzureEndpoint(payload)
+	} else if portainer.EndpointType(payload.EndpointType) == portainer.EdgeAgentEnvironment {
+		return handler.createEdgeAgentEndpoint(payload)
 	}
 
 	if payload.TLS {
@@ -195,6 +200,52 @@ func (handler *Handler) createAzureEndpoint(payload *endpointCreatePayload) (*po
 	return endpoint, nil
 }
 
+func (handler *Handler) createEdgeAgentEndpoint(payload *endpointCreatePayload) (*portainer.Endpoint, *httperror.HandlerError) {
+	endpointType := portainer.EdgeAgentEnvironment
+	endpointID := handler.EndpointService.GetNextIdentifier()
+
+	portainerURL, err := url.Parse(payload.URL)
+	if err != nil {
+		return nil, &httperror.HandlerError{http.StatusBadRequest, "Invalid endpoint URL", err}
+	}
+
+	portainerHost, _, err := net.SplitHostPort(portainerURL.Host)
+	if err != nil {
+		portainerHost = portainerURL.Host
+	}
+
+	if portainerHost == "localhost" {
+		return nil, &httperror.HandlerError{http.StatusBadRequest, "Invalid endpoint URL", errors.New("cannot use localhost as endpoint URL")}
+	}
+
+	edgeKey := handler.ReverseTunnelService.GenerateEdgeKey(payload.URL, portainerHost, endpointID)
+
+	endpoint := &portainer.Endpoint{
+		ID:      portainer.EndpointID(endpointID),
+		Name:    payload.Name,
+		URL:     portainerHost,
+		Type:    endpointType,
+		GroupID: portainer.EndpointGroupID(payload.GroupID),
+		TLSConfig: portainer.TLSConfiguration{
+			TLS: false,
+		},
+		AuthorizedUsers: []portainer.UserID{},
+		AuthorizedTeams: []portainer.TeamID{},
+		Extensions:      []portainer.EndpointExtension{},
+		Tags:            payload.Tags,
+		Status:          portainer.EndpointStatusUp,
+		Snapshots:       []portainer.Snapshot{},
+		EdgeKey:         edgeKey,
+	}
+
+	err = handler.EndpointService.CreateEndpoint(endpoint)
+	if err != nil {
+		return nil, &httperror.HandlerError{http.StatusInternalServerError, "Unable to persist endpoint inside the database", err}
+	}
+
+	return endpoint, nil
+}
+
 func (handler *Handler) createUnsecuredEndpoint(payload *endpointCreatePayload) (*portainer.Endpoint, *httperror.HandlerError) {
 	endpointType := portainer.DockerEnvironment