users: huge cleanup/dedupe, interface-based third-party services

shared "newUser" method is now "NewUserPostVerification", and is shared
between all routes which create a jellyfin account. The new
"NewUserFromInvite", "NewUserFromAdmin" and "NewUserFromConfirmationKey"
are smaller as a result. Discord, Telegram, and Matrix now implement the
"ContactMethodLinker" and "ContactMethodUser" interfaces, meaning code
is shared a lot between them in the NewUser methods, and the specifics
are now in their own files. Ombi/Jellyseerr similarly implement a
simpler interface "ThirdPartyService", which simply has ImportUser and
AddContactMethod routes. Note these new interface methods are only used
for user creation as of yet, but could likely be used in other places.

main.go

@@ -102,8 +102,9 @@ type appContext struct {
 	// Keeping jf name because I can't think of a better one
 	jf                   *mediabrowser.MediaBrowser
 	authJf               *mediabrowser.MediaBrowser
-	ombi                 *ombi.Ombi
-	js                   *jellyseerr.Jellyseerr
+	ombi                 *OmbiWrapper
+	js                   *JellyseerrWrapper
+	thirdPartyServices   []ThirdPartyService
 	datePattern          string
 	timePattern          string
 	storage              Storage
@@ -112,6 +113,7 @@ type appContext struct {
 	telegram             *TelegramDaemon
 	discord              *DiscordDaemon
 	matrix               *MatrixDaemon
+	contactMethods       []ContactMethodLinker
 	info, debug, err     *logger.Logger
 	host                 string
 	port                 int
@@ -349,27 +351,32 @@ func start(asDaemon, firstCall bool) {
 		}
 		address = fmt.Sprintf("%s:%d", app.host, app.port)
 
+		// NOTE: As of writing this, the order in app.thirdPartServices doesn't matter,
+		// but in future it might (like app.contactMethods does), so append to the end!
 		if app.config.Section("ombi").Key("enabled").MustBool(false) {
+			app.ombi = &OmbiWrapper{}
 			app.debug.Printf(lm.UsingOmbi)
 			ombiServer := app.config.Section("ombi").Key("server").String()
-			app.ombi = ombi.NewOmbi(
+			app.ombi.Ombi = ombi.NewOmbi(
 				ombiServer,
 				app.config.Section("ombi").Key("api_key").String(),
 				common.NewTimeoutHandler("Ombi", ombiServer, true),
 			)
-
+			app.thirdPartyServices = append(app.thirdPartyServices, app.ombi)
 		}
 
 		if app.config.Section("jellyseerr").Key("enabled").MustBool(false) {
+			app.js = &JellyseerrWrapper{}
 			app.debug.Printf(lm.UsingJellyseerr)
 			jellyseerrServer := app.config.Section("jellyseerr").Key("server").String()
-			app.js = jellyseerr.NewJellyseerr(
+			app.js.Jellyseerr = jellyseerr.NewJellyseerr(
 				jellyseerrServer,
 				app.config.Section("jellyseerr").Key("api_key").String(),
 				common.NewTimeoutHandler("Jellyseerr", jellyseerrServer, true),
 			)
 			app.js.AutoImportUsers = app.config.Section("jellyseerr").Key("import_existing").MustBool(false)
 			// app.js.LogRequestBodies = true
+			app.thirdPartyServices = append(app.thirdPartyServices, app.js)
 
 		}
 
@@ -511,17 +518,8 @@ func start(asDaemon, firstCall bool) {
 			defer backupDaemon.Shutdown()
 		}
 
-		if telegramEnabled {
-			app.telegram, err = newTelegramDaemon(app)
-			if err != nil {
-				app.err.Printf(lm.FailedInitTelegram, err)
-				telegramEnabled = false
-			} else {
-				app.debug.Println(lm.InitTelegram)
-				go app.telegram.run()
-				defer app.telegram.Shutdown()
-			}
-		}
+		// NOTE: The order in which these are placed in app.contactMethods matters.
+		// Add new ones to the end.
 		if discordEnabled {
 			app.discord, err = newDiscordDaemon(app)
 			if err != nil {
@@ -531,6 +529,19 @@ func start(asDaemon, firstCall bool) {
 				app.debug.Println(lm.InitDiscord)
 				go app.discord.run()
 				defer app.discord.Shutdown()
+				app.contactMethods = append(app.contactMethods, app.discord)
+			}
+		}
+		if telegramEnabled {
+			app.telegram, err = newTelegramDaemon(app)
+			if err != nil {
+				app.err.Printf(lm.FailedInitTelegram, err)
+				telegramEnabled = false
+			} else {
+				app.debug.Println(lm.InitTelegram)
+				go app.telegram.run()
+				defer app.telegram.Shutdown()
+				app.contactMethods = append(app.contactMethods, app.telegram)
 			}
 		}
 		if matrixEnabled {
@@ -542,6 +553,7 @@ func start(asDaemon, firstCall bool) {
 				app.debug.Println(lm.InitMatrix)
 				go app.matrix.run()
 				defer app.matrix.Shutdown()
+				app.contactMethods = append(app.contactMethods, app.matrix)
 			}
 		}
 	} else {