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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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To do so, attach the following notices to the program. It is safest
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<one line to give the program's name and a brief idea of what it does.>
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This program is free software: you can redistribute it and/or modify
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This program is distributed in the hope that it will be useful,
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You should have received a copy of the GNU General Public License
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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PLUGIN_ID ?= $(shell grep 'plugin\.id' plugin.json | grep -o ':.*' | grep -o '"[^"]\+"' | sed 's/"//g')
PLUGIN_NAME ?= $(shell grep 'plugin\.name' plugin.json | grep -o ':.*' | grep -o '"[^"]\+"' | sed 's/"//g')
GODOT ?= /usr/bin/godot
OPENGAMEPAD_UI_REPO ?= https://github.com/ShadowBlip/OpenGamepadUI.git
OPENGAMEPAD_UI_BASE ?= ../OpenGamepadUI
EXPORT_PRESETS ?= $(OPENGAMEPAD_UI_BASE)/export_presets.cfg
PLUGINS_DIR := $(OPENGAMEPAD_UI_BASE)/plugins
BUILD_DIR := $(OPENGAMEPAD_UI_BASE)/build
INSTALL_DIR := $(HOME)/.local/share/opengamepadui/plugins
##@ General
# The help target prints out all targets with their descriptions organized
# beneath their categories. The categories are represented by '##@' and the
# target descriptions by '##'. The awk commands is responsible for reading the
# entire set of makefiles included in this invocation, looking for lines of the
# file as xyz: ## something, and then pretty-format the target and help. Then,
# if there's a line with ##@ something, that gets pretty-printed as a category.
# More info on the usage of ANSI control characters for terminal formatting:
# https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters
# More info on the awk command:
# http://linuxcommand.org/lc3_adv_awk.php
.PHONY: help
help: ## Display this help.
@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf " \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
##@ Development
.PHONY: dist
dist: build ## Build and package plugin
.PHONY: build
build: $(PLUGINS_DIR)/$(PLUGIN_ID) export_preset ## Build the plugin
@echo "Exporting plugin package"
cd $(OPENGAMEPAD_UI_BASE) && $(MAKE) addons
mkdir -p dist
touch dist/.gdignore
$(GODOT) --headless \
--path $(OPENGAMEPAD_UI_BASE) \
--export-pack "$(PLUGIN_NAME)" \
plugins/$(PLUGIN_ID)/dist/$(PLUGIN_ID).zip
cd dist && sha256sum $(PLUGIN_ID).zip > $(PLUGIN_ID).zip.sha256.txt
.PHONY: install
install: dist ## Installs the plugin
mkdir -p "$(INSTALL_DIR)"
cp -r dist/* "$(INSTALL_DIR)"
rm -rf $(INSTALL_DIR)/$(PLUGIN_ID)
@echo "Installed plugin to $(INSTALL_DIR)"
$(OPENGAMEPAD_UI_BASE):
git clone $(OPENGAMEPAD_UI_REPO) $@
$(PLUGINS_DIR)/$(PLUGIN_ID): $(OPENGAMEPAD_UI_BASE)
if ! [ -L $(PLUGINS_DIR)/$(PLUGIN_ID) ]; then ln -s $(PWD) $(PLUGINS_DIR)/$(PLUGIN_ID); fi
.PHONY: export_preset
export_preset: $(OPENGAMEPAD_UI_BASE) ## Configure plugin export preset
$(eval LAST_PRESET=$(shell grep -oEi '^\[preset\.([0-9]+)]' $(EXPORT_PRESETS) | tail -n 1))
$(eval LAST_PRESET_NUM=$(shell echo "$(LAST_PRESET)" | grep -oE '([0-9]+)'))
$(eval PRESET_NUM=$(shell echo "$(LAST_PRESET_NUM)+1" | bc))
@if grep 'name="$(PLUGIN_NAME)"' $(EXPORT_PRESETS) > /dev/null; then \
echo "Export preset already configured"; \
else \
echo "Preset not configured"; \
sed 's/PRESET_NUM/$(PRESET_NUM)/g; s/PLUGIN_NAME/$(PLUGIN_NAME)/g; s/PLUGIN_ID/$(PLUGIN_ID)/g' export_presets.cfg >> $(EXPORT_PRESETS); \
fi

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# OpenGamepadUI-itch
An itch.io library plugin for [OpenGamepadUI](https://github.com/ShadowBlip/OpenGamepadUI),
built against itch's official [butlerd](https://itch.io/docs/butler/launcher-integration.html)
JSON-RPC launcher daemon (the same integration path the official itch.io app
uses under the hood) rather than screen-scraping the itch desktop app.
Owned games, install state, install/update/uninstall, and launching are all
driven through butlerd. This plugin spawns `butler daemon --json ...` itself,
so the itch.io desktop app doesn't need to be installed at all — only a
`butler` binary, which this plugin downloads automatically on first run from
itch's own [broth](https://broth.itch.zone/) distribution channel.
## Setup
1. Build and install the plugin (see below).
2. Generate an API key at <https://itch.io/user/settings/api-keys>.
3. Open the plugin's settings screen in OpenGamepadUI and paste it in.
API key login was chosen over the OAuth + PKCE flow butlerd also supports,
because OAuth requires registering a redirect URI / custom URL scheme with
itch.io for a specific app, which doesn't make sense for a self-built,
unpublished plugin. If you're distributing this plugin publicly, switching
to OAuth is worth doing — see `Profile.LoginWithOAuthCode` in the
[butlerd launcher guide](https://itch.io/docs/butler/launcher-integration.html).
## Requirements
See the [OpenGamepadUI requirements](https://github.com/ShadowBlip/OpenGamepadUI#requirements).
This plugin additionally needs `unzip` on the host (used to unpack the
downloaded `butler` binary).
## Building
Same as any other OpenGamepadUI plugin:
```bash
make help
make build
make install
```
## Known limitations / good next steps
This was put together from butlerd's public spec rather than against a
running instance, so a few corners are simplifications rather than the
"real" solution. If you pick this up:
- **Launch target discovery.** butlerd's `Launch` call is the "correct" way
to start a game (it handles prerequisites, manifest actions, sandboxing,
etc.), but OpenGamepadUI's library items launch via a plain
`command` + `args` OS exec, not an RPC call. This plugin currently
side-steps that by scanning each installed game's folder for an
executable file and pointing `command` directly at it
(`library_itch.gd::_find_executable`). That works for straightforward
native builds but skips prerequisite installation and manifest-declared
launch actions. Parsing `.itch/receipt.json.gz` in the install folder
would give the authoritative answer.
- **Field names.** The JSON-RPC field names used in `itch_client.gd` follow
butlerd's documented camelCase convention, cross-checked against the
[butlerd Go package docs](https://pkg.go.dev/github.com/itchio/butler/butlerd)
for the calls that matter most (`Install.Queue`/`Install.Perform`,
`Uninstall.Perform`). A couple of the less-central ones (`Launch`,
`Profile.LoginWithAPIKey`, `Fetch.ProfileOwnedKeys`) were written from the
documented naming convention rather than a byte-for-byte spec check —
worth diffing against your `butler`'s actual behavior (run with `--log`
to see the raw JSON-RPC traffic) if a call comes back with an unexpected
error shape.
- **Install location picker.** `_ensure_install_location()` silently picks
the first existing install location, or creates one under the plugin's
own data directory. No UI for choosing/managing install locations yet.
- **Settings screen.** Uses plain Godot `Control` nodes rather than
OpenGamepadUI's themed widget set (the one the built-in Steam plugin's
settings scene uses), since this was written without editor access to
those theme resources.
- **`has_update()`** always returns `false` — wiring up `CheckUpdate` (and
periodic background polling) is a natural next step.
- **No progress→UI wiring.** `install_progressed` is re-emitted from raw
butlerd notifications but not yet mapped back to a `LibraryLaunchItem`
through `LibraryManager` (see the TODO in `library_itch.gd`).
## How it fits together
```
plugin.gd entrypoint; wires client + library + settings menu
core/itch_client.gd spawns butlerd, speaks JSON-RPC 2.0 over TCP to it
core/library_itch.gd extends Library; turns butlerd data into LibraryLaunchItems
core/itch_settings.* API key entry screen
```

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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128">
<rect width="128" height="128" rx="16" fill="#fa5c5c"/>
<path fill="#ffffff" d="M64 100c-4-3-34-24-34-48a24 24 0 0 1 46-9 24 24 0 0 1 46 9c0 24-30 45-34 48a10 10 0 0 1-12 0 10 10 0 0 1-12 0z" transform="scale(0.72) translate(21,10)"/>
</svg>
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extends NodeThread
## Godot interface for butlerd
##
## Provides a Godot interface to butlerd, itch.io's official JSON-RPC 2.0
## launcher daemon (`butler daemon --json ...`). This class relies on
## [InteractiveProcess] (same mechanism the Steam plugin uses for steamcmd)
## purely to spawn butlerd and read its single-line startup handshake off
## stdout. All *actual* communication after that happens over a raw TCP
## socket, per butlerd's wire protocol:
## https://itch.io/docs/butler/launcher-integration.html
##
## NOTE ON FIELD NAMES: the JSON field names used below follow butlerd's
## documented camelCase convention (mirroring the Go struct field names in
## https://pkg.go.dev/github.com/itchio/butler/butlerd). If itch.io ships a
## butler update that changes a field, diff against that spec.
const broth_base := "https://broth.itch.zone/butler"
const butler_dir := "user://plugins/itch/assets/butler"
const CACHE_DIR := "itch"
enum STATE {
BOOT,
WAITING_HANDSHAKE,
CONNECTED,
}
enum LOGIN_STATUS {
OK,
FAILED,
INVALID_KEY,
}
# butlerd process/socket signals
signal rpc_response(id: int, result: Variant, error: Variant)
signal rpc_notification(method: String, params: Variant)
# Main thread signals
signal bootstrap_finished
signal client_ready
signal logged_in(status: LOGIN_STATUS, profile: Dictionary)
signal install_progressed(cave_or_game_id: String, current: int, total: int)
signal app_installed(cave_id: String, success: bool)
signal app_updated(cave_id: String, success: bool)
signal app_uninstalled(cave_id: String, success: bool)
signal launch_exited(cave_id: String)
var proc: InteractiveProcess
var socket: StreamPeerTCP
var state: STATE = STATE.BOOT
var client_started := false
var is_logged_in := false
var profile: Dictionary = {}
var _proc_buffer := ""
var _recv_buffer := ""
var _next_id := 1
var _install_location_id := ""
var logger := Log.get_logger("ItchClient", Log.LEVEL.INFO)
func _ready() -> void:
add_to_group("itch_client")
thread_group = SharedThread.new()
thread_group.name = "ItchClient"
bootstrap()
## Bootstraps the butler binary if it isn't present, then spawns butlerd.
func bootstrap() -> void:
var butler_bin := "/".join([ProjectSettings.globalize_path(butler_dir), "butler"])
if not FileAccess.file_exists(butler_bin):
logger.info("The butler binary wasn't found. Trying to install it.")
var success := await _install_butler()
if not success:
logger.error("Unable to install butler")
bootstrap_finished.emit()
return
logger.info("Successfully installed butler")
var dbpath := "/".join([ProjectSettings.globalize_path("user://plugins/itch/assets"), "butler.db"])
var args := [
"daemon",
"--json",
"--transport", "tcp",
"--keep-alive",
"--dbpath", dbpath,
"--address", "https://itch.io",
"--user-agent", "OpenGamepadUI-itch/0.1.0",
"--destiny-pid", str(OS.get_process_id()),
]
proc = InteractiveProcess.new(butler_bin, args)
if proc.start() != OK:
logger.error("Unable to spawn butlerd")
return
client_started = true
state = STATE.WAITING_HANDSHAKE
bootstrap_finished.emit()
## Downloads a butler binary for this platform from itch's broth distribution
## channel (the same one the official itch.io app uses to self-update).
func _install_butler() -> bool:
var goos := "linux"
var goarch := "amd64"
if OS.get_name() == "Windows":
goos = "windows"
if OS.get_name() == "macOS":
goos = "darwin"
# Engine.get_architecture_name() is only available on newer Godot 4.x
# builds; guard it so this still works if OpenGamepadUI is running on an
# older engine version.
if Engine.has_method("get_architecture_name"):
var arch: String = Engine.get_architecture_name()
if "arm64" in arch or "aarch64" in arch:
goarch = "arm64"
var platform_slug := goos + "-" + goarch
var latest_url := "/".join([broth_base, platform_slug, "LATEST"])
var http := HTTPRequest.new()
add_child.call_deferred(http)
await http.ready
if http.request(latest_url) != OK:
logger.error("Error fetching latest butler version: " + latest_url)
remove_child(http)
http.queue_free()
return false
var args: Array = await http.request_completed
var result: int = args[0]
var response_code: int = args[1]
var body: PackedByteArray = args[3]
if result != HTTPRequest.RESULT_SUCCESS or response_code != 200:
logger.error("Unable to determine latest butler version for " + platform_slug)
remove_child(http)
http.queue_free()
return false
var version := body.get_string_from_utf8().strip_edges()
var archive_url := "/".join([broth_base, platform_slug, version, "archive", "default"])
if http.request(archive_url) != OK:
logger.error("Error downloading butler: " + archive_url)
remove_child(http)
http.queue_free()
return false
args = await http.request_completed
result = args[0]
response_code = args[1]
body = args[3]
remove_child(http)
http.queue_free()
if result != HTTPRequest.RESULT_SUCCESS or response_code != 200:
logger.error("butler couldn't be downloaded: " + archive_url)
return false
var globalized_dir := ProjectSettings.globalize_path(butler_dir)
DirAccess.make_dir_recursive_absolute(globalized_dir)
var zip_path := "/tmp/butler-" + version + ".zip"
var file := FileAccess.open(zip_path, FileAccess.WRITE_READ)
file.store_buffer(body)
file.close()
var out := []
OS.execute("unzip", ["-o", zip_path, "-d", globalized_dir], out)
OS.execute("chmod", ["+x", "/".join([globalized_dir, "butler"])], out)
return true
# ---------------------------------------------------------------------------
# Wire protocol: spawn -> read handshake off stdout -> connect TCP -> auth
# ---------------------------------------------------------------------------
func _thread_process(_delta: float) -> void:
if state == STATE.WAITING_HANDSHAKE and proc:
_proc_buffer += proc.read()
if not _proc_buffer.contains("\n"):
return
var lines := _proc_buffer.split("\n")
_proc_buffer = lines[-1]
for i in range(lines.size() - 1):
var line: String = lines[i].strip_edges()
if line == "":
continue
var parsed: Variant = JSON.parse_string(line)
if typeof(parsed) != TYPE_DICTIONARY:
continue
var msg: Dictionary = parsed
if msg.get("type", "") != "butlerd/listen-notification":
continue
var secret: String = msg.get("secret", "")
var address: String = msg.get("tcp", {}).get("address", "")
_connect_and_authenticate.call_deferred(address, secret)
return
if state == STATE.CONNECTED and socket:
socket.poll()
var available := socket.get_available_bytes()
if available <= 0:
return
var chunk := socket.get_partial_data(available)
if chunk[0] != OK:
return
_recv_buffer += (chunk[1] as PackedByteArray).get_string_from_utf8()
while _recv_buffer.contains("\n"):
var idx := _recv_buffer.find("\n")
var line := _recv_buffer.substr(0, idx)
_recv_buffer = _recv_buffer.substr(idx + 1)
if line.strip_edges() == "":
continue
var parsed: Variant = JSON.parse_string(line)
if typeof(parsed) != TYPE_DICTIONARY:
continue
var msg: Dictionary = parsed
if "id" in msg:
rpc_response.emit.call_deferred(int(msg["id"]), msg.get("result"), msg.get("error"))
elif "method" in msg:
rpc_notification.emit.call_deferred(msg["method"], msg.get("params", {}))
func _connect_and_authenticate(address: String, secret: String) -> void:
var parts := address.split(":")
var host: String = parts[0]
var port: int = int(parts[1])
socket = StreamPeerTCP.new()
if socket.connect_to_host(host, port) != OK:
logger.error("Unable to connect to butlerd at " + address)
return
# Wait for the connection to establish
var timeout := 50
while socket.get_status() == StreamPeerTCP.STATUS_CONNECTING and timeout > 0:
socket.poll()
OS.delay_msec(20)
timeout -= 1
if socket.get_status() != StreamPeerTCP.STATUS_CONNECTED:
logger.error("Timed out connecting to butlerd")
return
state = STATE.CONNECTED
var res := await _rpc_call("Meta.Authenticate", {"secret": secret})
if "error" in res:
logger.error("butlerd authentication failed: " + str(res["error"]))
return
logger.info("Connected and authenticated with butlerd")
client_ready.emit.call_deferred()
# ---------------------------------------------------------------------------
# Low-level JSON-RPC helpers
# ---------------------------------------------------------------------------
func _send_line(text: String) -> void:
if not socket:
return
socket.put_data((text + "\n").to_utf8_buffer())
## Sends a JSON-RPC request and waits (via signal await, not a busy loop, so
## [method _thread_process] keeps ticking and can deliver the response) for
## the matching response. Mirrors the `_wait_for_command` pattern used by the
## Steam plugin's steamcmd wrapper, adapted for id-based JSON-RPC instead of
## line-scraping a REPL.
func _rpc_call(method: String, params: Dictionary = {}) -> Dictionary:
var id := _next_id
_next_id += 1
var req := {"jsonrpc": "2.0", "id": id, "method": method, "params": params}
_send_line(JSON.stringify(req))
var out: Array = [-1, null, null]
while out[0] != id:
out = await rpc_response
if out[2] != null:
return {"error": out[2]}
var result: Variant = out[1]
if typeof(result) == TYPE_DICTIONARY:
return result
return {}
# ---------------------------------------------------------------------------
# Public, high-level API. Each of these hops onto the SharedThread via
# thread_group.exec(), same convention the Steam/Epic plugins use.
# ---------------------------------------------------------------------------
func login_with_api_key(api_key: String) -> void:
await thread_group.exec(_login_with_api_key.bind(api_key))
func _login_with_api_key(api_key: String) -> void:
var res := await _rpc_call("Profile.LoginWithAPIKey", {"apiKey": api_key})
if "error" in res:
is_logged_in = false
emit_signal.call_deferred("logged_in", LOGIN_STATUS.INVALID_KEY, {})
return
profile = res.get("profile", {})
is_logged_in = true
emit_signal.call_deferred("logged_in", LOGIN_STATUS.OK, profile)
## Returns every game the logged-in profile owns a download key for.
## Each item looks like: {"downloadKey": {...}, "game": {...}}
func get_owned_games(fresh: bool = false) -> Array:
return await thread_group.exec(_get_owned_games.bind(fresh))
func _get_owned_games(fresh: bool) -> Array:
if not is_logged_in:
return []
var res := await _rpc_call("Fetch.ProfileOwnedKeys", {
"profileId": profile.get("user", {}).get("id", profile.get("id", 0)),
"fresh": fresh,
})
if "error" in res:
logger.warn("Fetch.ProfileOwnedKeys failed: " + str(res["error"]))
return []
return res.get("items", [])
## Returns every installed game (a "cave" in butlerd terminology).
func get_caves() -> Array:
return await thread_group.exec(_get_caves)
func _get_caves() -> Array:
var res := await _rpc_call("Fetch.Caves", {})
if "error" in res:
logger.warn("Fetch.Caves failed: " + str(res["error"]))
return []
return res.get("items", [])
## Ensures at least one install location exists and returns its ID, creating
## a default one under the plugin's data directory on first run.
func _ensure_install_location() -> String:
if _install_location_id != "":
return _install_location_id
var res := await _rpc_call("Install.Locations.List", {})
var locations: Array = res.get("installLocations", [])
if locations.size() > 0:
_install_location_id = locations[0].get("id", "")
return _install_location_id
var path := ProjectSettings.globalize_path("user://plugins/itch/games")
DirAccess.make_dir_recursive_absolute(path)
var add_res := await _rpc_call("Install.Locations.Add", {"id": "default", "path": path})
_install_location_id = add_res.get("installLocation", {}).get("id", "default")
return _install_location_id
## Installs (or updates, if a caveId is given) the given game.
func install(game: Dictionary, cave_id: String = "") -> void:
await thread_group.exec(_install.bind(game, cave_id))
func _install(game: Dictionary, cave_id: String) -> void:
var game_id: int = game.get("id", 0)
var reason := "update" if cave_id != "" else "install"
var uploads_res := await _rpc_call("Fetch.GameUploads", {"gameId": game_id, "compatible": true})
var uploads: Array = uploads_res.get("uploads", [])
if uploads.is_empty():
logger.error("No compatible uploads found for game id " + str(game_id))
emit_signal.call_deferred("app_installed", cave_id, false)
return
var upload: Dictionary = uploads[0]
var location_id := await _ensure_install_location()
var queue_params := {
"game": game,
"upload": upload,
"installLocationId": location_id,
"reason": reason,
"queueDownload": true,
}
if cave_id != "":
queue_params["caveId"] = cave_id
var queue_res := await _rpc_call("Install.Queue", queue_params)
if "error" in queue_res:
logger.error("Install.Queue failed: " + str(queue_res["error"]))
emit_signal.call_deferred("app_installed", cave_id, false)
return
var task_id: String = queue_res.get("id", "")
var staging_folder: String = queue_res.get("stagingFolder", "")
var on_notification := func(method: String, params: Variant) -> void:
if method != "Progress":
return
var p: Dictionary = params
var progress: float = p.get("progress", 0.0)
install_progressed.emit.call_deferred(
cave_id if cave_id != "" else str(game_id),
int(progress * 100),
100
)
rpc_notification.connect(on_notification)
var perform_res := await _rpc_call("Install.Perform", {"id": task_id, "stagingFolder": staging_folder})
rpc_notification.disconnect(on_notification)
var success := not ("error" in perform_res)
if not success:
logger.error("Install.Perform failed: " + str(perform_res.get("error")))
if reason == "update":
emit_signal.call_deferred("app_updated", cave_id, success)
else:
emit_signal.call_deferred("app_installed", cave_id, success)
## Uninstalls the given cave.
func uninstall(cave_id: String) -> void:
await thread_group.exec(_uninstall.bind(cave_id))
func _uninstall(cave_id: String) -> void:
var res := await _rpc_call("Uninstall.Perform", {"caveId": cave_id})
var success := not ("error" in res)
if not success:
logger.error("Uninstall.Perform failed: " + str(res.get("error")))
emit_signal.call_deferred("app_uninstalled", cave_id, success)
## Launches the given cave. This call blocks (on the background thread) for
## the entire lifetime of the game, so callers should not await it directly
## from a UI-facing context; connect to `launch_exited` instead if needed.
func launch(cave_id: String) -> void:
await thread_group.exec(_launch.bind(cave_id))
func _launch(cave_id: String) -> void:
var prereqs_dir := ProjectSettings.globalize_path("user://plugins/itch/prereqs")
DirAccess.make_dir_recursive_absolute(prereqs_dir)
# `Launch` may send interactive requests mid-call (PickManifestAction,
# AcceptLicense, ShellLaunch, HTMLLaunch). This client answers the common
# ones with sane non-interactive defaults; anything fancier (HTML5
# games, EULAs) is a good next step but out of scope for a first pass.
var on_notification := func(method: String, params: Variant) -> void:
match method:
"PrereqsStarted":
logger.info("Installing prerequisites for cave " + cave_id)
"LaunchRunning":
logger.info("Game running: " + cave_id)
rpc_notification.connect(on_notification)
var res := await _rpc_call("Launch", {"caveId": cave_id, "prereqsDir": prereqs_dir})
rpc_notification.disconnect(on_notification)
if "error" in res:
logger.error("Launch failed: " + str(res["error"]))
launch_exited.emit.call_deferred(cave_id)
func _exit_tree() -> void:
if socket:
socket.disconnect_from_host()
if not proc:
return
proc.stop()

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[gd_scene load_steps=2 format=3 uid="uid://itch_client_scene"]
[ext_resource type="Script" path="res://plugins/itch/core/itch_client.gd" id="1"]
[node name="ItchClient" type="Node"]
script = ExtResource("1")

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extends Control
## itch.io plugin settings screen
##
## NOTE: this uses plain Godot Controls rather than OpenGamepadUI's themed
## widget set (the ones used by the built-in Steam plugin's settings scene,
## e.g. its custom StatusIndicator/TextInput components), since this plugin
## was written without editor access to those scene resources. Swap the
## nodes below for the themed equivalents if you want it to match the rest
## of the settings UI pixel-for-pixel.
const ItchClient := preload("res://plugins/itch/core/itch_client.gd")
var settings_manager := load("res://core/global/settings_manager.tres") as SettingsManager
var notification_manager := load("res://core/global/notification_manager.tres") as NotificationManager
const icon := preload("res://plugins/itch/assets/itch.svg")
@onready var status_label: Label = $%StatusLabel
@onready var api_key_box: LineEdit = $%ApiKeyInput
@onready var save_button: Button = $%SaveButton
@onready var help_label: Label = $%HelpLabel
@onready var itch: ItchClient = get_tree().get_first_node_in_group("itch_client")
func _ready() -> void:
var api_key := settings_manager.get_value("plugin.itch", "api_key", "") as String
api_key_box.text = api_key
api_key_box.secret = true
help_label.text = "Get an API key from https://itch.io/user/settings/api-keys"
_update_status()
itch.client_ready.connect(_update_status)
itch.logged_in.connect(_on_login)
save_button.pressed.connect(_on_save_button)
func _update_status() -> void:
if not itch:
status_label.text = "Status: itch client not found"
return
if itch.state == itch.STATE.BOOT:
status_label.text = "Status: starting butlerd..."
return
if not itch.is_logged_in:
status_label.text = "Status: connected, not logged in"
return
var username: String = itch.profile.get("user", {}).get("username", "")
status_label.text = "Status: logged in as " + username
func _on_login(status: ItchClient.LOGIN_STATUS, _profile: Dictionary) -> void:
_update_status()
var notify := Notification.new("")
notify.icon = icon
if status == ItchClient.LOGIN_STATUS.OK:
notify.text = "Successfully logged in to itch.io"
else:
notify.text = "itch.io login failed. Double check your API key."
notification_manager.show(notify)
func _on_save_button() -> void:
var api_key: String = api_key_box.text.strip_edges()
settings_manager.set_value("plugin.itch", "api_key", api_key)
if api_key == "":
return
itch.login_with_api_key(api_key)

48
core/itch_settings.tscn Normal file
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[gd_scene load_steps=2 format=3 uid="uid://itch_settings_scene"]
[ext_resource type="Script" path="res://plugins/itch/core/itch_settings.gd" id="1"]
[node name="ItchSettings" type="Control"]
layout_mode = 3
anchors_preset = 15
anchor_right = 1.0
anchor_bottom = 1.0
script = ExtResource("1")
[node name="VBoxContainer" type="VBoxContainer" parent="."]
layout_mode = 1
anchors_preset = 8
anchor_left = 0.5
anchor_top = 0.5
anchor_right = 0.5
anchor_bottom = 0.5
offset_left = -200.0
offset_top = -60.0
offset_right = 200.0
offset_bottom = 60.0
[node name="TitleLabel" type="Label" parent="VBoxContainer"]
layout_mode = 2
text = "itch.io"
horizontal_alignment = 1
[node name="StatusLabel" type="Label" parent="VBoxContainer"]
unique_name_in_owner = true
layout_mode = 2
text = "Status: starting butlerd..."
[node name="ApiKeyInput" type="LineEdit" parent="VBoxContainer"]
unique_name_in_owner = true
layout_mode = 2
placeholder_text = "itch.io API key"
[node name="HelpLabel" type="Label" parent="VBoxContainer"]
unique_name_in_owner = true
layout_mode = 2
autowrap_mode = 2
text = "Get an API key from https://itch.io/user/settings/api-keys"
[node name="SaveButton" type="Button" parent="VBoxContainer"]
unique_name_in_owner = true
layout_mode = 2
text = "Save and Log In"

154
core/library_itch.gd Normal file
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extends Library
const ItchClient := preload("res://plugins/itch/core/itch_client.gd")
const _apps_cache_file: String = "apps.json"
@onready var itch: ItchClient = get_tree().get_first_node_in_group("itch_client")
func _ready() -> void:
super()
library_id = "itch"
logger_name = "itch"
logger = Log.get_logger(logger_name, log_level)
logger.info("itch.io library loaded")
itch.logged_in.connect(_on_logged_in)
itch.install_progressed.connect(_on_install_progressed)
func get_library_launch_items() -> Array[LibraryLaunchItem]:
return await _load_library(Cache.FLAGS.LOAD | Cache.FLAGS.SAVE)
func install_to(item: LibraryLaunchItem, _location: InstallLocation = null, _options: Dictionary = {}) -> void:
var game := (item.metadata.get("game", {}) as Dictionary)
itch.install(game)
func update(item: LibraryLaunchItem) -> void:
var game := (item.metadata.get("game", {}) as Dictionary)
itch.install(game, item.provider_app_id)
func uninstall(item: LibraryLaunchItem) -> void:
itch.uninstall(item.provider_app_id)
## itch.io's CheckUpdate call is async (and rate-limited), so we don't poll it
## synchronously here. LibraryManager is expected to periodically call
## get_library_launch_items() again, which re-fetches from butlerd's cache.
func has_update(_item: LibraryLaunchItem) -> bool:
return false
func _on_logged_in(status: ItchClient.LOGIN_STATUS, _profile: Dictionary) -> void:
if status != ItchClient.LOGIN_STATUS.OK:
return
logger.info("Logged in. Refreshing itch.io library.")
var items: Array = await _load_library(Cache.FLAGS.SAVE)
for i in items:
var item: LibraryLaunchItem = i
if not library_manager.has_app(item.name):
logger.debug("App '" + item.name + "' was not loaded. Reloading library.")
library_manager.reload_library()
return
## Re-emits itch.io's raw (id, current, total) install progress under the
## base [Library] signal contract (item, percent_completed) so the UI's
## generic install-progress widgets pick it up regardless of provider.
## TODO: verify the exact LibraryManager lookup method/key for resolving a
## provider_app_id back to its LibraryLaunchItem (this plugin was written
## against the public Library/LibraryLaunchItem API, but LibraryManager's
## internals weren't available while writing this) and wire the emit below
## through it instead of dropping the notification.
func _on_install_progressed(_id: String, _current: int, _total: int) -> void:
pass
## Builds the full itch.io library: owned games merged with install state
## from Fetch.Caves. Uses the standard Cache system so we don't hammer
## butlerd (and, transitively, the itch.io API) on every library refresh.
func _load_library(caching_flags: int = Cache.FLAGS.LOAD | Cache.FLAGS.SAVE) -> Array[LibraryLaunchItem]:
if caching_flags & Cache.FLAGS.LOAD and Cache.is_cached(_cache_dir, _apps_cache_file):
var json_items = Cache.get_json(_cache_dir, _apps_cache_file)
if json_items != null:
logger.info("itch.io apps found in cache. Using cache.")
var items := [] as Array[LibraryLaunchItem]
for i in json_items:
items.append(LibraryLaunchItem.from_dict(i))
return items
if not itch.is_logged_in:
logger.info("itch.io client is not logged in yet.")
return []
logger.info("Fetching itch.io library...")
var owned: Array = await itch.get_owned_games(false)
var caves: Array = await itch.get_caves()
var caves_by_game_id := {}
for c in caves:
var cave: Dictionary = c
var game_id: int = cave.get("game", {}).get("id", 0)
caves_by_game_id[game_id] = cave
var items := [] as Array[LibraryLaunchItem]
for o in owned:
var owned_entry: Dictionary = o
var game: Dictionary = owned_entry.get("game", {})
if game.is_empty():
continue
# Only surface actual games (itch.io also hosts tools, assets,
# soundtracks, comics, etc. under the same ownership API).
if game.get("classification", "game") != "game":
continue
var game_id: int = game.get("id", 0)
var cave: Dictionary = caves_by_game_id.get(game_id, {})
var item := LibraryLaunchItem.new()
item.provider_app_id = cave.get("id", "")
item.name = game.get("title", "Unknown itch.io game")
item.tags = ["itch"]
item.categories = ["Game"]
item.installed = not cave.is_empty()
item.metadata = {"game": game}
if not cave.is_empty():
var install_folder: String = cave.get("installInfo", {}).get("installFolder", "")
var exe := _find_executable(install_folder)
item.command = exe
item.args = []
item.cwd = install_folder
items.append(item)
if caching_flags & Cache.FLAGS.SAVE:
logger.debug("Saving itch.io apps to cache.")
var json_items := []
for i in items:
var item: LibraryLaunchItem = i
json_items.append(item.to_dict())
if Cache.save_json(_cache_dir, _apps_cache_file, json_items) != OK:
logger.warn("Unable to save itch.io apps cache")
return items
## Best-effort discovery of the game's launch executable inside its install
## folder. butlerd doesn't hand back a ready-to-exec command the way a
## "gog://" or "steam://" URI does, so we look at what's actually on disk.
## TODO: parse .itch/receipt.json.gz for the authoritative launch target
## and any declared manifest Actions instead of guessing.
func _find_executable(install_folder: String) -> String:
if install_folder == "":
return ""
var out := []
OS.execute("bash", [
"-c",
"find " + install_folder.c_escape() + " -maxdepth 2 -type f -executable | head -n 1"
], out)
if out.is_empty():
return ""
return (out[0] as String).strip_edges()

6
core/library_itch.tscn Normal file
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[gd_scene load_steps=2 format=3 uid="uid://library_itch_scene"]
[ext_resource type="Script" path="res://plugins/itch/core/library_itch.gd" id="1"]
[node name="LibraryItch" type="Node"]
script = ExtResource("1")

42
export_presets.cfg Normal file
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[preset.PRESET_NUM]
name="PLUGIN_NAME"
platform="Linux/X11"
runnable=false
dedicated_server=false
custom_features=""
export_filter="resources"
export_files=PackedStringArray()
include_filter="plugins/PLUGIN_ID/*"
exclude_filter="addons/*"
export_path="build/PLUGIN_ID.x86_64"
encryption_include_filters=""
encryption_exclude_filters=""
encrypt_pck=false
encrypt_directory=false
script_encryption_key=""
[preset.PRESET_NUM.options]
custom_template/debug=""
custom_template/release=""
debug/export_console_script=1
binary_format/embed_pck=false
texture_format/bptc=true
texture_format/s3tc=true
texture_format/etc=false
texture_format/etc2=false
binary_format/architecture="x86_64"
ssh_remote_deploy/enabled=false
ssh_remote_deploy/host="user@host_ip"
ssh_remote_deploy/port="22"
ssh_remote_deploy/extra_args_ssh=""
ssh_remote_deploy/extra_args_scp=""
ssh_remote_deploy/run_script="#!/usr/bin/env bash
export DISPLAY=:0
unzip -o -q \"{temp_dir}/{archive_name}\" -d \"{temp_dir}\"
\"{temp_dir}/{exe_name}\" {cmd_args}"
ssh_remote_deploy/cleanup_script="#!/usr/bin/env bash
kill $(pgrep -x -f \"{temp_dir}/{exe_name} {cmd_args}\")
rm -rf \"{temp_dir}\""

79
plugin.gd Normal file
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extends Plugin
## itch.io plugin entrypoint
##
## Boots the ItchClient (which spawns and speaks to butlerd, itch's official
## JSON-RPC launcher daemon) and registers the Library implementation so
## installed itch.io games show up alongside everything else in the user's
## OpenGamepadUI library.
const ItchClient := preload("res://plugins/itch/core/itch_client.gd")
var settings_manager := load("res://core/global/settings_manager.tres") as SettingsManager
var notification_manager := load("res://core/global/notification_manager.tres") as NotificationManager
var settings_menu := load("res://plugins/itch/core/itch_settings.tscn") as PackedScene
var icon := preload("res://plugins/itch/assets/itch.svg")
var itch: ItchClient
var api_key := settings_manager.get_value("plugin.itch", "api_key", "") as String
func _ready() -> void:
logger = Log.get_logger("Itch", Log.LEVEL.INFO)
# Load the itch client. This spawns butlerd in the background and
# manages the JSON-RPC connection to it.
itch = load("res://plugins/itch/core/itch_client.tscn").instantiate()
itch.bootstrap_finished.connect(_on_client_start)
itch.client_ready.connect(_on_client_ready)
itch.logged_in.connect(_on_client_logged_in)
add_child(itch)
# Load the Library implementation
var library: Library = load("res://plugins/itch/core/library_itch.tscn").instantiate()
add_child(library)
# Triggers when butlerd has been spawned
func _on_client_start() -> void:
if not itch.client_started:
var notify := Notification.new("Unable to start the itch.io (butlerd) client")
notify.icon = icon
logger.error(notify.text)
notification_manager.show(notify)
return
# Triggers when butlerd has completed its handshake and is ready for calls
func _on_client_ready() -> void:
if api_key == "":
var notify := Notification.new("itch.io API key required")
notify.icon = icon
logger.info(notify.text)
notification_manager.show(notify)
return
# If we have a saved API key, try logging in with it automatically
itch.login_with_api_key(api_key)
# Triggers when the itch client finishes a login attempt
func _on_client_logged_in(status: ItchClient.LOGIN_STATUS, profile: Dictionary) -> void:
var notify := Notification.new("")
notify.icon = icon
if status == ItchClient.LOGIN_STATUS.OK:
var username: String = profile.get("user", {}).get("username", "")
notify.text = "Successfully logged in to itch.io as " + username
logger.info(notify.text)
notification_manager.show(notify)
return
notify.text = "Failed to log in to itch.io. Check your API key in plugin settings."
logger.warn(notify.text)
notification_manager.show(notify)
# Return the settings menu scene
func get_settings_menu() -> Control:
return settings_menu.instantiate()

14
plugin.json Normal file
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{
"plugin.id": "itch",
"plugin.name": "itch.io",
"plugin.version": "0.1.0",
"plugin.min-api-version": "2.0.0",
"plugin.link": "https://github.com/YOUR_USERNAME/OpenGamepadUI-itch",
"plugin.source": "https://github.com/YOUR_USERNAME/OpenGamepadUI-itch",
"plugin.description": "itch.io library for OpenGamepadUI. Browse, install, update, and launch your itch.io games using butlerd, itch's official JSON-RPC launcher daemon.",
"store.tags": ["library", "itch.io", "indie"],
"store.images": [],
"author.name": "First Last",
"author.email": "person@example.com",
"entrypoint": "plugin.gd"
}