Usage documentation

[09williamsad]

After the last update, I now get "invalid character '<' looking for beginning of value" at the star of the main for loop, after changing the asset version and running. I suspect that there is a significant difference between how I am using this tool and how it has been made to be used.

Can you add information detailing: how it is supposed to be used Its dependencies required modifications etc.

[hax0r31337]

well you need to replace this with an actual version

[Riunia]

well you need to replace this with an actual version

Apologies for the stupid question, but how would I go about finding the Asset Version?

[hax0r31337]

You can log the request with mitmproxy after you killed the certificate pinning in BestHTTP2

[09williamsad]

well you need to replace this with an actual version

I did that, which I why I think some other step is being missed.

What is the execution environment and steps involved for this tool? For example: Does it need a go 1.21.1 or do higher versions work? Does terminal focus need to be in a specific folder? Are there any steps other than changing the asset version required? Does this use a standard golang run like "go run main.go"? It is designed to work with a golang IDE or just to be run?

[hax0r31337]

I think it will be fine across go versions.
I'd recommend you to run it in the folder of the project
Nope.
go run ./main It's designed to run without an IDE as I'm using NeoVim sometimes

[09williamsad]

Thanks, that clears up the running.

For the version do you mean: The published game version, currently 1.0.2 The game code version, currently, 847 Or something else?

You can log the request with mitmproxy after you killed the certificate pinning in BestHTTP2

I am not sure how to use those tools for this use case.

[hax0r31337]

For the version I meant the game asset version

[09williamsad]

Steps:

1. Install latest golang, currently 1.21.3
2. Clone project and extract the zip
3. Edit main.go so that the base_url has the game version, currently 1.0.2. const BASE_URL = "https://asset.resleriana.jp/asset/1.0.2/Android/"
4. Open terminal and change directory to the resleriana_tools-main
5. Run the command "go run ./main"

This results in: panic: invalid character '<' looking for beginning of value goroutine 1 [running]: main.main() C:/Users/adamw/Downloads/resleriana_tools-main/main/main.go:27 +0x5e5 exit status 2

I presume I am missing something.

From what I understand, the current version download the catalog.json file and assets. Or am I mistaken and I need to put the catalog.json and bundle files somewhere?

[hax0r31337]

You need game asset version instead of game version

[Riunia]

Haven't actually used BestHTTP2 before but given that it's a Unity Extension, I imagine I'd have to get the files into Unity somehow?

Tried using Frida but running into too many issues with the security around the app (root detection, emulator detection).

[hax0r31337]

Haven't actually used BestHTTP2 before but given that it's a Unity Extension, I imagine I'd have to get the files into Unity somehow?

Tried using Frida but running into too many issues with the security around the app (root detection, emulator detection).

I coded a xposed module to hook its function with https://github.com/Rprop/And64InlineHook/, also for live debugging.
but i'll keep it private

[09williamsad]

You need game asset version instead of game version

Can you specify what that looks like and how to acquire it?

While I can get the full game files from my rooted device without issue, I have no familiarity with: mitmproxy, xposed and BestHTTP2. I can see many versions in the games files, but beyond trial and error I do not know which is the asset version.

Are you saying that network http request tracing is required to determine the asset version? I did something simular a while back when getting a retired games files, but that required older versions of android.

Would the version not be in the game files somewhere?

[hax0r31337]

You need game asset version instead of game version

Can you specify what that looks like and how to acquire it?

While I can get the full game files from my rooted device without issue, I have no familiarity with: mitmproxy, xposed and BestHTTP2. I can see many versions in the games files, but beyond trial and error I do not know which is the asset version.

Are you saying that network http request tracing is required to determine the asset version? I did something simular a while back when getting a retired games files, but that required older versions of android.

Would the version not be in the game files somewhere?

It's like timestamp_randomString, for example the latest asset version for now is 1697082844_f3OrnfHInH1ixh1s

[09williamsad]

It's like timestamp_randomString, for example the latest asset version for now is 1697082844_f3OrnfHInH1ixh1s

Thanks, that is / is in these files: "jp.co.koeitecmo.resleriana\no_backup\ABCache\aas_catalog_versions.json" "jp.co.koeitecmo.resleriana\no_backup\ABCache\current_catalog.json" "jp.co.koeitecmo.resleriana\no_backup\ABCache\content_catalogs\1697082844_f3OrnfHInH1ixh1s_catalog.json"

I have made the base url variable const BASE_URL = "https://asset.resleriana.jp/asset/1697082844_f3OrnfHInH1ixh1s/Android/" I double checked and that is the same asset version in the current game files.

I still get same error panic: invalid character '<' looking for beginning of value goroutine 1 [running]: main.main() C:/Users/adamw/Downloads/resleriana_tools-main/main/main.go:27 +0x5e5 exit status 2

I am not sure what I am missing here. I double checked my VPN, its the same one that I used to download the files on my phone, and its still showing my location as Tokyo.

[hax0r31337]

Try to open https://asset.resleriana.jp/asset/1697082844_f3OrnfHInH1ixh1s/Android/catalog.json in browser, as long as you can download this file, it should be no problem. Also double check you saved the updated code in IDE

[09williamsad]

I can open the file in my browser, with and without VPN. The main.go file has been saved with the current version.

I forgot to check the basics, my antivirus was blocking the running. However, it now partially works. It downloads a bunch of files to "C:\Users\adamw\AppData\Local\go-build" but gets the same error after a bit. Last write action is trim.txt with the value 1697749135.

[09williamsad]

I have just checked, the game must have updated in the last hour. As that is a newer version. I will get the new catalog/asset version later and try again.

[hax0r31337]

I have just checked, the game must have updated in the last hour. As that is a newer version. I will get the new catalog/asset version later and try again.

I think the game seems not have any update at this time, it's 6 am in Japan now

[09williamsad]

I have done more attempts, checks, reinstalls, complete redownloads etc. Something else seems to be going on.

The current game version is 1.0.3 with asset version 1697082844_f3OrnfHInH1ixh1s. {"_serializationVersion":1,"_version":"1697082844_f3OrnfHInH1ixh1s","_appVersion":"1.0.3","_isBuiltin":false}

I set the base_url to that 'const BASE_URL = "https://asset.resleriana.jp/asset/1697082844_f3OrnfHInH1ixh1s/Android/"' I execute "go run ./main". It starts downloading files to "C:\Users\adamw\AppData\Local\go-build", list of files attached. go-build files.txt The last file it downloads before the error is trim.txt with the content "1697811932".

1697811932 looks like a version, but its not anywhere in the latest game files, I checked using UTF8 content searches to be sure.

[sent00]

Hello. There have been several recent updates to the application, but the asset version has not changed since October 17. I am unable to get the latest data, is it possible that something has changed in the system?

[Amarillys]

I have done more attempts, checks, reinstalls, complete redownloads etc. Something else seems to be going on.

The current game version is 1.0.3 with asset version 1697082844_f3OrnfHInH1ixh1s. {"_serializationVersion":1,"_version":"1697082844_f3OrnfHInH1ixh1s","_appVersion":"1.0.3","_isBuiltin":false}

I set the base_url to that 'const BASE_URL = "https://asset.resleriana.jp/asset/1697082844_f3OrnfHInH1ixh1s/Android/"' I execute "go run ./main". It starts downloading files to "C:\Users\adamw\AppData\Local\go-build", list of files attached. go-build files.txt The last file it downloads before the error is trim.txt with the content "1697811932".

1697811932 looks like a version, but its not anywhere in the latest game files, I checked using UTF8 content searches to be sure.

Hello, I got into the same issue: panic: invalid character '<' looking for beginning of value. After a time of debugging, I found "%5C" string in url, is because of filepath.Join in fetch functions.

Try to modify filepath.Join to path.Join, and the problem will be solved.→_→

package main

import (
    "log"
    "net/http"
    "net/url"
    "path"
)

var client = &http.Client{
    Transport: &http.Transport{
        DisableKeepAlives: true,
        ForceAttemptHTTP2: true,
        Proxy:             http.ProxyFromEnvironment,
    },
}

func fetch(subpath string) (*http.Response, error) {
    u, err := url.Parse(BASE_URL)
    if err != nil {
        return nil, err
    }
    u.Path = path.Join(u.Path, fpath)
    req, err := http.NewRequest("GET", u.String(), nil)
    if err != nil {
        return nil, err
    }

    req.Header.Add("User-Agent", "BestHTTP/2 v2.5.4")

    return client.Do(req)
}