generate.py

# Modpack manifest.json Generator
# by jadc

import requests
import json
import sys


def generate():
    # Prepare headers with unique user-agent
    headers = {'User-Agent': 'modmanifestgen'}

    # Reads manifest template
    with open('manifest-template.json') as m:
        manifest = json.load(m)

    # Check if version is configured in manifest
    if manifest['minecraft']['version'] == '':
        print('Error. There is no Minecraft version specified in the manifest.json')
        exit()

    # Determines latest forge modloader version depending on mc version
    modLoaderData = requests.get('https://addons-ecs.forgesvc.net/api/v2/minecraft/modloader', headers=headers)
    for key in modLoaderData.json():
        if key['latest'] == True:
            if key['gameVersion'] == manifest['minecraft']['version']:
                modLoaders = [{"id": key['name'], "primary": True}]
                manifest['minecraft']["modLoaders"] = modLoaders

    # Reads file from drag and drop or first argument, otherwise emods.txt
    if len(sys.argv) > 1:
        i = open(sys.argv[1], 'r')
    else:
        try:
            i = open('mods.txt')
        except FileNotFoundError:
            print(
                'Error. Default mods list (mods.txt) not found; either create it or use another file in the argument/drag '
                'and drop.')
            exit()

    # Prepares output file
    mods = {
        'files': []
    }

    # Mod log function
    line = 0

    def log(s):
        global line
        print('LINE #' + str(line).zfill(4) + ': ' + s)

    # Project ID from Curseforge link
    def getProjectIDFromLink(link):
        req = requests.get(link, headers=headers)

    # For every mod id
    for line in i:
        line += 1

        # Remove whitespace
        line = line.strip()

        # Skip blank lines
        if not line:
            continue

        # Skip comments
        if line.startswith('#'):
            print(projectID)
            continue

        # Get project id from curseforge link
        projectID = getProjectIDFromLink(line)

        # API GET Request
        api = requests.get('https://addons-ecs.forgesvc.net/api/v2/addon/' + projectID, headers=headers)

        # Skip non-existent mods
        if api.status_code == 404:
            log('Failed to add mod. Not found.')
            continue

        data = api.json()

        # Gets mod name
        modname = data['name']

        # Gets file id for latest build in desired mc version
        for key in data['gameVersionLatestFiles']:

            buildExists = False
            # If mod has desired mc version
            if key['gameVersion'] == manifest['minecraft']['version']:
                # Prepares json for mod
                mod = {
                    'alias': modname + ' (' + key['projectFileName'] + ')',
                    'projectID': int(projectID),
                    'fileID': key['projectFileId'],
                    'required': True
                }

                mods['files'].append(mod)
                log('Added [' + modname + '] (' + key['projectFileName'] + ')')
                buildExists = True
                break

            if not buildExists:
                log('Failed to add [' + modname + '], no build for MC ' + manifest['minecraft']['version'])

    # Add files object to manifest
    manifest['files'] = mods['files']

    # Output manifest json to file (with beautify)
    with open('manifest.json', 'w') as o:
        json.dump(manifest, o, sort_keys=True, indent=4)

    print('Done. Press ENTER to close this window.')

    # Pause to allow viewing of logs
    input()