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call_resthook.go
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call_resthook.go
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package actions
import (
"encoding/json"
"net/http"
"strings"
"github.com/nyaruka/goflow/flows"
"github.com/nyaruka/goflow/flows/events"
"github.com/pkg/errors"
)
// ResthookPayload is the POST payload used by resthooks
const ResthookPayload = `@(json(object(
"contact", object("uuid", contact.uuid, "name", contact.name, "urn", contact.urn, "language", contact.language),
"flow", run.flow,
"path", run.path,
"results", foreach_value(results, extract_object, "category", "category_localized", "created_on", "input", "name", "node_uuid", "value"),
"run", object("uuid", run.uuid, "created_on", run.created_on),
"input", if(
input,
object(
"attachments", foreach(input.attachments, attachment_parts),
"channel", input.channel,
"created_on", input.created_on,
"text", input.text,
"type", input.type,
"urn", if(
input.urn,
object(
"display", default(format_urn(input.urn), ""),
"path", urn_parts(input.urn).path,
"scheme", urn_parts(input.urn).scheme
),
null
),
"uuid", input.uuid
),
null
),
"channel", default(input.channel, null)
)))`
func init() {
registerType(TypeCallResthook, func() flows.Action { return &CallResthookAction{} })
}
// TypeCallResthook is the type for the call resthook action
const TypeCallResthook string = "call_resthook"
// CallResthookAction can be used to call a resthook.
//
// A [event:webhook_called] event will be created for each subscriber of the resthook with the results
// of the HTTP call. If the action has `result_name` set, a result will
// be created with that name, and if the resthook returns valid JSON, that will be accessible
// through `extra` on the result.
//
// {
// "uuid": "8eebd020-1af5-431c-b943-aa670fc74da9",
// "type": "call_resthook",
// "resthook": "new-registration"
// }
//
// @action call_resthook
type CallResthookAction struct {
baseAction
onlineAction
Resthook string `json:"resthook" validate:"required"`
ResultName string `json:"result_name,omitempty"`
}
// NewCallResthook creates a new call resthook action
func NewCallResthook(uuid flows.ActionUUID, resthook string, resultName string) *CallResthookAction {
return &CallResthookAction{
baseAction: newBaseAction(TypeCallResthook, uuid),
Resthook: resthook,
ResultName: resultName,
}
}
// Execute runs this action
func (a *CallResthookAction) Execute(run flows.FlowRun, step flows.Step, logModifier flows.ModifierCallback, logEvent flows.EventCallback) error {
// NOOP if resthook doesn't exist
resthook := run.Session().Assets().Resthooks().FindBySlug(a.Resthook)
if resthook == nil {
return nil
}
// build our payload (not truncated)
payload, err := run.EvaluateTemplateText(ResthookPayload, nil, false)
if err != nil {
// if we got an error then our payload is likely not valid JSON
return errors.Wrapf(err, "error evaluating resthook payload")
}
// check the payload is valid JSON - it ends up in the session so needs to be valid
if !json.Valid([]byte(payload)) {
return errors.Errorf("resthook payload evaluation produced invalid JSON: %s", payload)
}
// regardless of what subscriber calls we make, we need to record the payload that would be sent
logEvent(events.NewResthookCalled(a.Resthook, json.RawMessage(payload)))
// make a call to each subscriber URL
calls := make([]*flows.WebhookCall, 0, len(resthook.Subscribers()))
for _, url := range resthook.Subscribers() {
req, err := http.NewRequest("POST", url, strings.NewReader(payload))
if err != nil {
logEvent(events.NewError(err))
return nil
}
req.Header.Add("Content-Type", "application/json")
svc, err := run.Session().Engine().Services().Webhook(run.Session())
if err != nil {
logEvent(events.NewError(err))
return nil
}
call, err := svc.Call(run.Session(), req)
if err != nil {
logEvent(events.NewError(err))
}
if call != nil {
calls = append(calls, call)
logEvent(events.NewWebhookCalled(call, callStatus(call, nil, true), a.Resthook))
}
}
asResult := a.pickResultCall(calls)
if asResult != nil {
a.updateWebhook(run, asResult)
}
if a.ResultName != "" {
if asResult != nil {
a.saveWebhookResult(run, step, a.ResultName, asResult, callStatus(asResult, nil, true), logEvent)
} else {
a.saveResult(run, step, a.ResultName, "no subscribers", "Failure", "", "", nil, logEvent)
}
}
return nil
}
// picks one of the resthook calls to become the result generated by this action
func (a *CallResthookAction) pickResultCall(calls []*flows.WebhookCall) *flows.WebhookCall {
var lastSuccess, last410, lastFailure *flows.WebhookCall
for _, call := range calls {
status := callStatus(call, nil, true)
if status == flows.CallStatusSuccess {
lastSuccess = call
} else if status == flows.CallStatusSubscriberGone {
last410 = call
} else {
lastFailure = call
}
}
// 1. if we got one or more errors (non-410, non-200), result is last failure
// 2. if we no errors, no 410s, but at least one success, result is last success
// 3. if we only got 410s, result is last 410
if lastFailure != nil {
return lastFailure
} else if lastSuccess != nil {
return lastSuccess
}
return last410
}
// Results enumerates any results generated by this flow object
func (a *CallResthookAction) Results(include func(*flows.ResultInfo)) {
if a.ResultName != "" {
include(flows.NewResultInfo(a.ResultName, webhookCategories))
}
}