webhooks: add "user created" webhook

Webhooks send a POST to an admin-supplied URL when something happens,
with relevant information sent in JSON. One has been added for creating
users in Settings > Webhooks > User Created.

Lazily, the portion of GetUsers which generates a respUser has been
factored out, and is called to send the JSON payload.

A stripped-down common.Req method has been added, which is used by the
barebones WebhookSender struct.

api-users.go

@@ -42,7 +42,7 @@ func (app *appContext) NewUserFromAdmin(gc *gin.Context) {
 			profile = p
 		}
 	}
-	nu := app.NewUserPostVerification(NewUserParams{
+	nu /*wg*/, _ := app.NewUserPostVerification(NewUserParams{
 		Req:                 req,
 		SourceType:          ActivityAdmin,
 		Source:              gc.GetString("jfId"),
@@ -59,6 +59,8 @@ func (app *appContext) NewUserFromAdmin(gc *gin.Context) {
 	}
 
 	respondUser(nu.Status, nu.Created, welcomeMessageSentIfNecessary, nu.Message, gc)
+	// These don't need to complete anytime soon
+	// wg.Wait()
 }
 
 // @Summary Creates a new Jellyfin user via invite code
@@ -205,8 +207,7 @@ func (app *appContext) NewUserFromInvite(gc *gin.Context) {
 		profile = &p
 	}
 
-	// FIXME: Use NewUserPostVerification
-	nu := app.NewUserPostVerification(NewUserParams{
+	nu /*wg*/, _ := app.NewUserPostVerification(NewUserParams{
 		Req:                 req,
 		SourceType:          sourceType,
 		Source:              source,
@@ -341,7 +342,10 @@ func (app *appContext) NewUserFromInvite(gc *gin.Context) {
 			code = 400
 		}
 	}
+
 	gc.JSON(code, validation)
+	// These don't need to complete anytime soon
+	// wg.Wait()
 }
 
 // @Summary Enable/Disable a list of users, optionally notifying them why.
@@ -822,27 +826,10 @@ func (app *appContext) AdminPasswordReset(gc *gin.Context) {
 	respondBool(204, true, gc)
 }
 
-// @Summary Get a list of Jellyfin users.
-// @Produce json
-// @Success 200 {object} getUsersDTO
-// @Failure 500 {object} stringResponse
-// @Router /users [get]
-// @Security Bearer
-// @tags Users
-func (app *appContext) GetUsers(gc *gin.Context) {
-	var resp getUsersDTO
-	users, err := app.jf.GetUsers(false)
-	resp.UserList = make([]respUser, len(users))
-	if err != nil {
-		app.err.Printf(lm.FailedGetUsers, lm.Jellyfin, err)
-		respond(500, "Couldn't get users", gc)
-		return
-	}
+func (app *appContext) userSummary(jfUser mediabrowser.User) respUser {
 	adminOnly := app.config.Section("ui").Key("admin_only").MustBool(true)
 	allowAll := app.config.Section("ui").Key("allow_all").MustBool(false)
 	referralsEnabled := app.config.Section("user_page").Key("referrals").MustBool(false)
-	i := 0
-	for _, jfUser := range users {
 	user := respUser{
 		ID:               jfUser.ID,
 		Name:             jfUser.Name,
@@ -889,6 +876,29 @@ func (app *appContext) GetUsers(gc *gin.Context) {
 			user.ReferralsEnabled = true
 		}
 	}
+	return user
+
+}
+
+// @Summary Get a list of Jellyfin users.
+// @Produce json
+// @Success 200 {object} getUsersDTO
+// @Failure 500 {object} stringResponse
+// @Router /users [get]
+// @Security Bearer
+// @tags Users
+func (app *appContext) GetUsers(gc *gin.Context) {
+	var resp getUsersDTO
+	users, err := app.jf.GetUsers(false)
+	resp.UserList = make([]respUser, len(users))
+	if err != nil {
+		app.err.Printf(lm.FailedGetUsers, lm.Jellyfin, err)
+		respond(500, "Couldn't get users", gc)
+		return
+	}
+	i := 0
+	for _, jfUser := range users {
+		user := app.userSummary(jfUser)
 		resp.UserList[i] = user
 		i++
 	}

api.go

@@ -354,6 +354,8 @@ func (app *appContext) ModifyConfig(gc *gin.Context) {
 					tempConfig.Section("telegram").Key("language").SetValue(value.(string))
 				} else if app.configBase.Sections[section].Settings[setting].Type == "list" {
 					splitValues := strings.Split(value.(string), "|")
+					// Delete the key first to get rid of any shadow values
+					tempConfig.Section(section).DeleteKey(setting)
 					for i, v := range splitValues {
 						if i == 0 {
 							tempConfig.Section(section).Key(setting).SetValue(v)

common/common.go

@@ -1,10 +1,16 @@
 package common
 
 import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
+	"net/url"
+	"strings"
 
 	lm "github.com/hrfee/jfa-go/logmessages"
 )
@@ -77,3 +83,68 @@ type ConfigurableTransport interface {
 	// SetTransport sets the http.Transport to use for requests. Can be used to set a proxy.
 	SetTransport(t *http.Transport)
 }
+
+// Stripped down-ish version of rough http request function used in most of the API clients.
+func Req(httpClient *http.Client, timeoutHandler TimeoutHandler, mode string, uri string, data any, queryParams url.Values, headers map[string]string, response bool) (string, int, error) {
+	var params []byte
+	if data != nil {
+		params, _ = json.Marshal(data)
+	}
+	if qp := queryParams.Encode(); qp != "" {
+		uri += "?" + qp
+	}
+	var req *http.Request
+	if data != nil {
+		req, _ = http.NewRequest(mode, uri, bytes.NewBuffer(params))
+	} else {
+		req, _ = http.NewRequest(mode, uri, nil)
+	}
+	req.Header.Add("Content-Type", "application/json")
+	for name, value := range headers {
+		req.Header.Add(name, value)
+	}
+	resp, err := httpClient.Do(req)
+	if resp == nil {
+		return "", 0, err
+	}
+	err = GenericErr(resp.StatusCode, err)
+	if timeoutHandler != nil {
+		defer timeoutHandler()
+	}
+	var responseText string
+	defer resp.Body.Close()
+	if response || err != nil {
+		responseText, err = decodeResp(resp)
+		if err != nil {
+			return responseText, resp.StatusCode, err
+		}
+	}
+	if err != nil {
+		var msg any
+		err = json.Unmarshal([]byte(responseText), &msg)
+		if err != nil {
+			return responseText, resp.StatusCode, err
+		}
+		if msg != nil {
+			err = fmt.Errorf("got %d: %+v", resp.StatusCode, msg)
+		}
+		return responseText, resp.StatusCode, err
+	}
+	return responseText, resp.StatusCode, err
+}
+
+func decodeResp(resp *http.Response) (string, error) {
+	var out io.Reader
+	switch resp.Header.Get("Content-Encoding") {
+	case "gzip":
+		out, _ = gzip.NewReader(resp.Body)
+	default:
+		out = resp.Body
+	}
+	buf := new(strings.Builder)
+	_, err := io.Copy(buf, out)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}

config/config-base.json

@@ -2017,6 +2017,24 @@
                 }
             }
         },
+        "webhooks": {
+            "order": [],
+            "meta": {
+                "name": "Webhooks",
+                "description": "jfa-go will send a POST request to these URLs when an event occurs, with relevant information. Request information is logged when debug logging is enabled.",
+                "wiki_link": "https://wiki.jfa-go.com/docs/webhooks/"
+            },
+            "settings": {
+                "created": {
+                    "name": "User Created",
+                    "required": false,
+                    "requires_restart": false,
+                    "type": "list",
+                    "value": "",
+                    "description": "URLs to hit when an account is created through jfa-go. Sends a `respUser` object."
+                }
+            }
+        },
         "files": {
             "order": [],
             "meta": {

logmessages/logmessages.go

@@ -307,6 +307,9 @@ const (
 	CaptchaNotFound       = "Captcha \"%s\" not found in invite \"%s\""
 	FailedVerifyReCAPTCHA = "Failed to verify reCAPTCHA: %v"
 	InvalidHostname       = "invalid hostname (wanted \"%s\", got \"%s\")"
+
+	// webhooks.go
+	WebhookRequest = "Webhook request send to \"%s\" (%d): %v"
 )
 
 const (

main.go

@@ -121,6 +121,7 @@ type appContext struct {
 	version                              string
 	URLBase, ExternalURI, ExternalDomain string
 	updater                              *Updater
+	webhooks                             *WebhookSender
 	newUpdate                            bool // Whether whatever's in update is new.
 	tag                                  Tag
 	update                               Update
@@ -556,8 +557,14 @@ func start(asDaemon, firstCall bool) {
 			}
 		}
 
+		// Non-consequential if we don't need it
+		app.webhooks = NewWebhookSender(
+			common.NewTimeoutHandler("Webhook", "?", true),
+			app.debug,
+		)
+
+		// Updater proxy set in config.go, don't worry!
 		if app.proxyEnabled {
-			app.updater.SetTransport(app.proxyTransport)
 			app.jf.SetTransport(app.proxyTransport)
 			for _, c := range app.thirdPartyServices {
 				c.SetTransport(app.proxyTransport)

models.go

@@ -1,6 +1,8 @@
 package main
 
-import "time"
+import (
+	"time"
+)
 
 type stringResponse struct {
 	Response string `json:"response" example:"message"`

ts/modules/settings.ts

@@ -218,7 +218,7 @@ class DOMList extends DOMInput implements SList {
         const addDummy = () => {
             const dummyRow = this.inputRow();
             const input = dummyRow.querySelector("input") as HTMLInputElement;
-            input.placeholder = window.lang.strings("Add");
+            input.placeholder = window.lang.strings("add");
             const onDummyChange = () => {
                 if (!(input.value)) return;
                 addDummy();

updater.go

@@ -130,11 +130,6 @@ type Updater struct {
 	binary                                     string
 }
 
-// SetTransport sets the http.Transport to use for requests. Can be used to set a proxy.
-func (ud *Updater) SetTransport(t *http.Transport) {
-	ud.httpClient.Transport = t
-}
-
 func newUpdater(buildroneURL, namespace, repo, version, commit, buildType string) *Updater {
 	// fmt.Printf(`Updater intializing with "%s", "%s", "%s", "%s", "%s", "%s"\n`, buildroneURL, namespace, repo, version, commit, buildType)
 	bType := off

users.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"sync"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -49,7 +50,8 @@ type NewUserData struct {
 }
 
 // Called after a new-user-creating route has done pre-steps (veryfing contact methods for example).
-func (app *appContext) NewUserPostVerification(p NewUserParams) (out NewUserData) {
+func (app *appContext) NewUserPostVerification(p NewUserParams) (out NewUserData, pendingTasks *sync.WaitGroup) {
+	pendingTasks = &sync.WaitGroup{}
 	// Some helper functions which will behave as our app.info/error/debug
 	deferLogInfo := func(s string, args ...any) {
 		out.Log = func() {
@@ -124,7 +126,19 @@ func (app *appContext) NewUserPostVerification(p NewUserParams) (out NewUserData
 		}
 	}
 
-	// Welcome email is sent by each user of this method separately..
+	webhookURIs := app.config.Section("webhooks").Key("created").StringsWithShadows("|")
+	if len(webhookURIs) != 0 {
+		summary := app.userSummary(out.User)
+		for _, uri := range webhookURIs {
+			go func() {
+				pendingTasks.Add(1)
+				app.webhooks.Send(uri, summary)
+				pendingTasks.Done()
+			}()
+		}
+	}
+
+	// Welcome email is sent by each user of this method separately.
 
 	out.Status = 200
 	out.Success = true

views.go

@@ -666,7 +666,7 @@ func (app *appContext) NewUserFromConfirmationKey(invite Invite, key string, lan
 		profile = &p
 	}
 
-	nu := app.NewUserPostVerification(NewUserParams{
+	nu /*wg*/, _ := app.NewUserPostVerification(NewUserParams{
 		Req:                 req,
 		SourceType:          sourceType,
 		Source:              source,
@@ -707,6 +707,9 @@ func (app *appContext) NewUserFromConfirmationKey(invite Invite, key string, lan
 	delete(invKeys, key)
 	app.ConfirmationKeys[invite.Code] = invKeys
 	app.confirmationKeysLock.Unlock()
+
+	// These don't need to complete anytime soon
+	// wg.Wait()
 	return
 }
 

webhooks.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/hrfee/jfa-go/common"
+	"github.com/hrfee/jfa-go/logger"
+	lm "github.com/hrfee/jfa-go/logmessages"
+)
+
+type WebhookSender struct {
+	httpClient     *http.Client
+	timeoutHandler common.TimeoutHandler
+	log            *logger.Logger
+}
+
+// SetTransport sets the http.Transport to use for requests. Can be used to set a proxy.
+func (ws *WebhookSender) SetTransport(t *http.Transport) {
+	ws.httpClient.Transport = t
+}
+
+func NewWebhookSender(timeoutHandler common.TimeoutHandler, log *logger.Logger) *WebhookSender {
+	return &WebhookSender{
+		httpClient: &http.Client{
+			Timeout: 10 * time.Second,
+		},
+		timeoutHandler: timeoutHandler,
+		log:            log,
+	}
+}
+
+func (ws *WebhookSender) Send(uri string, payload any) (int, error) {
+	_, status, err := common.Req(ws.httpClient, ws.timeoutHandler, http.MethodPost, uri, payload, url.Values{}, nil, true)
+	ws.log.Printf(lm.WebhookRequest, uri, status, err)
+	return status, err
+}