Modrinth-plus/apps/frontend/src/helpers/package.js

/* eslint-disable no-undef */
import JSZip from "jszip";
import TOML from "@ltd/j-toml";

export const createDataPackVersion = async function (
  project,
  version,
  primaryFile,
  members,
  allGameVersions,
  loaders,
) {
  // force version to start with number, as required by FML
  const newVersionNumber = version.version_number.match(/^\d/)
    ? version.version_number
    : `1-${version.version_number}`;

  const newSlug = `mr_${project.slug.replace("-", "_").replace(/\W/g, "")}`.substring(0, 63);

  const iconPath = `${project.slug}_pack.png`;

  const config = useRuntimeConfig();

  const fabricModJson = {
    schemaVersion: 1,
    id: newSlug,
    version: newVersionNumber,
    name: project.title,
    description: project.description,
    authors: members.map((x) => x.name),
    contact: {
      homepage: `${config.public.siteUrl}/${project.project_type}/${project.slug ?? project.id}`,
    },
    license: project.license.id,
    icon: iconPath,
    environment: "*",
    depends: {
      "fabric-resource-loader-v0": "*",
    },
  };

  const quiltModJson = {
    schema_version: 1,
    quilt_loader: {
      group: "com.modrinth",
      id: newSlug,
      version: newVersionNumber,
      metadata: {
        name: project.title,
        description: project.description,
        contributors: members.reduce(
          (acc, x) => ({
            ...acc,
            [x.name]: x.role,
          }),
          {},
        ),
        contact: {
          homepage: `${config.public.siteUrl}/${project.project_type}/${
            project.slug ?? project.id
          }`,
        },
        icon: iconPath,
      },
      intermediate_mappings: "net.fabricmc:intermediary",
      depends: [
        {
          id: "quilt_resource_loader",
          versions: "*",
          unless: "fabric-resource-loader-v0",
        },
      ],
    },
  };

  const cutoffIndex = allGameVersions.findIndex((x) => x.version === "1.18.2");

  let maximumIndex = Number.MIN_VALUE;
  for (const val of version.game_versions) {
    const index = allGameVersions.findIndex((x) => x.version === val);
    if (index > maximumIndex) {
      maximumIndex = index;
    }
  }

  const newForge = maximumIndex < cutoffIndex;

  const forgeModsToml = {
    modLoader: newForge ? "lowcodefml" : "javafml",
    loaderVersion: newForge ? "[40,)" : "[25,)",
    license: project.license.id,
    showAsResourcePack: false,
    mods: [
      {
        modId: newSlug,
        version: newVersionNumber,
        displayName: project.title,
        description: project.description,
        logoFile: iconPath,
        updateJSONURL: `${config.public.apiBaseUrl.replace("/v2/", "")}/updates/${
          project.id
        }/forge_updates.json`,
        credits: "Generated by Modrinth",
        authors: members.map((x) => x.name).join(", "),
        displayURL: `${config.public.siteUrl}/${project.project_type}/${
          project.slug ?? project.id
        }`,
      },
    ],
  };

  if (project.source_url) {
    quiltModJson.quilt_loader.metadata.contact.sources = project.source_url;
    fabricModJson.contact.sources = project.source_url;
  }

  if (project.issues_url) {
    quiltModJson.quilt_loader.metadata.contact.issues = project.issues_url;
    fabricModJson.contact.issues = project.issues_url;
    forgeModsToml.issueTrackerURL = project.issues_url;
  }

  const primaryFileData = await (await fetch(primaryFile.url)).blob();

  const primaryZipReader = new JSZip();
  await primaryZipReader.loadAsync(primaryFileData);

  if (loaders.includes("fabric")) {
    primaryZipReader.file("fabric.mod.json", JSON.stringify(fabricModJson));
  }
  if (loaders.includes("quilt")) {
    primaryZipReader.file("quilt.mod.json", JSON.stringify(quiltModJson));
  }
  if (loaders.includes("forge")) {
    primaryZipReader.file("META-INF/mods.toml", TOML.stringify(forgeModsToml, { newline: "\n" }));
  }

  if (!newForge && loaders.includes("forge")) {
    const classFile = new Uint8Array(
      await (
        await fetch("https://cdn.modrinth.com/wrapper/ModrinthWrapperRestiched.class")
      ).arrayBuffer(),
    );

    let binary = "";
    for (let i = 0; i < classFile.byteLength; i++) {
      binary += String.fromCharCode(classFile[i]);
    }

    let sanitizedId = project.id;

    if (project.id.match(/^(\d+)/g)) {
      sanitizedId = "_" + sanitizedId;
    }

    sanitizedId = sanitizedId.substring(0, 8);

    binary = binary
      .replace(
        String.fromCharCode(32) + "needs1to1be1changed1modrinth1mod",
        String.fromCharCode(newSlug.length) + newSlug,
      )
      .replace("/wrappera/", `/${sanitizedId}/`);

    const newArr = [];
    for (let i = 0; i < binary.length; i++) {
      newArr.push(binary.charCodeAt(i));
    }

    primaryZipReader.file(
      `com/modrinth/${sanitizedId}/ModrinthWrapper.class`,
      new Uint8Array(newArr),
    );
  }

  const resourcePack = version.files.find((x) => x.file_type === "required-resource-pack");

  const resourcePackData = resourcePack ? await (await fetch(resourcePack.url)).blob() : null;

  if (resourcePackData) {
    const resourcePackReader = new JSZip();
    await resourcePackReader.loadAsync(resourcePackData);

    for (const [path, file] of Object.entries(resourcePackReader.files)) {
      if (!primaryZipReader.file(path) && !path.includes(".mcassetsroot")) {
        primaryZipReader.file(path, await file.async("uint8array"));
      }
    }
  }

  if (primaryZipReader.file("pack.png")) {
    primaryZipReader.file(iconPath, await primaryZipReader.file("pack.png").async("uint8array"));
  }

  return await primaryZipReader.generateAsync({
    type: "blob",
    mimeType: "application/java-archive",
  });
};