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call_webhook.go
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/
call_webhook.go
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package actions
import (
"fmt"
"net/http"
"strings"
"github.com/nyaruka/goflow/flows"
"github.com/nyaruka/goflow/flows/events"
)
// TypeCallWebhook is the type for the call webhook action
const TypeCallWebhook string = "call_webhook"
// CallWebhookAction can be used to call an external service and insert the results in @run.webhook
// context variable. The body, header and url fields may be templates and will be evaluated at runtime.
//
// A `webhook_called` event will be created based on the results of the HTTP call.
//
// {
// "uuid": "8eebd020-1af5-431c-b943-aa670fc74da9",
// "type": "call_webhook",
// "method": "GET",
// "url": "http://localhost:49998/?cmd=success",
// "headers": {
// "Authorization": "Token AAFFZZHH"
// }
// }
//
// @action call_webhook
type CallWebhookAction struct {
BaseAction
Method string `json:"method" validate:"required,http_method"`
URL string `json:"url" validate:"required"`
Headers map[string]string `json:"headers,omitempty"`
Body string `json:"body,omitempty"`
}
// Type returns the type of this action
func (a *CallWebhookAction) Type() string { return TypeCallWebhook }
// Validate validates our action is valid and has all the assets it needs
func (a *CallWebhookAction) Validate(assets flows.SessionAssets) error {
return nil
}
// Execute runs this action
func (a *CallWebhookAction) Execute(run flows.FlowRun, step flows.Step, log flows.EventLog) error {
// substitute any variables in our url
url, err := run.EvaluateTemplateAsString(a.URL, true)
if err != nil {
log.Add(events.NewErrorEvent(err))
}
if url == "" {
log.Add(events.NewErrorEvent(fmt.Errorf("call_webhook URL evaluated to empty string, skipping")))
return nil
}
method := strings.ToUpper(a.Method)
body := a.Body
// substitute any body variables
if body != "" {
body, err = run.EvaluateTemplateAsString(body, false)
if err != nil {
log.Add(events.NewErrorEvent(err))
}
}
// build our request
req, err := http.NewRequest(method, url, strings.NewReader(body))
if err != nil {
log.Add(events.NewErrorEvent(err))
return nil
}
// add the custom headers, substituting any template vars
for key, value := range a.Headers {
headerValue, err := run.EvaluateTemplateAsString(value, false)
if err != nil {
log.Add(events.NewErrorEvent(err))
}
req.Header.Add(key, headerValue)
}
webhook, err := flows.MakeWebhookCall(run.Session(), req)
if err != nil {
log.Add(events.NewErrorEvent(err))
} else {
log.Add(events.NewWebhookCalledEvent(webhook.URL(), webhook.Status(), webhook.StatusCode(), webhook.Request(), webhook.Response()))
}
run.SetWebhook(webhook)
return nil
}