Implemented class that represents Fabric metadata

src/loaders/fabric/fabric-metadata.ts

@@ -0,0 +1,112 @@
+import { Dependency } from "@/dependencies";
+import { MINECRAFT } from "@/games/minecraft";
+import { LoaderMetadata } from "@/loaders/loader-metadata";
+import { PlatformType } from "@/platforms";
+import { $i } from "@/utils/collections";
+import { asString } from "@/utils/string-utils";
+import { getFabricDependencies, normalizeFabricDependency } from "./fabric-dependency";
+import { FabricMetadataCustomPayload, getDependenciesFromFabricMetadataCustomPayload, getFabricMetadataCustomPayload, getLoadersFromFabricMetadataCustomPayload, getProjectIdFromFabricMetadataCustomPayload } from "./fabric-metadata-custom-payload";
+import { RawFabricMetadata } from "./raw-fabric-metadata";
+
+/**
+ * Represents Fabric mod metadata.
+ */
+export class FabricMetadata implements LoaderMetadata {
+    /**
+     * The raw Fabric metadata used to create this instance.
+     */
+    private readonly _raw: RawFabricMetadata;
+
+    /**
+     * Constructs a new {@link FabricMetadata} instance.
+     *
+     * @param raw - The raw Fabric metadata.
+     */
+    private constructor(raw: RawFabricMetadata) {
+        this._raw = raw || {} as RawFabricMetadata;
+    }
+
+    /**
+     * Creates a new {@link FabricMetadata} instance from the given raw metadata.
+     *
+     * @param raw - The raw Fabric metadata.
+     *
+     * @returns A new `FabricMetadata` instance.
+     */
+    static from(raw: RawFabricMetadata): FabricMetadata {
+        return new FabricMetadata(raw);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get id(): string {
+        return asString(this._raw.id || "");
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get name(): string {
+        return asString(this._raw.name || this._raw.id || "");
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get version(): string {
+        return asString(this._raw.version || "*");
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get loaders(): string[] {
+        return getLoadersFromFabricMetadataCustomPayload(this.customPayload);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get gameName(): string {
+        return MINECRAFT;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get gameVersions(): string[] {
+        return [...(this.dependencies.find(x => x.id === this.gameName)?.versions || [])];
+    }
+
+    /**
+     * @inheritdoc
+     */
+    get dependencies(): Dependency[] {
+        const baseDependencies = getFabricDependencies(this._raw).map(normalizeFabricDependency).filter(x => x);
+        const payloadDependencies = getDependenciesFromFabricMetadataCustomPayload(this.customPayload);
+        const dependencyMap = $i(baseDependencies).concat(payloadDependencies).filter(x => x).map(x => [x.id, x] as const).toMap();
+        return [...dependencyMap.values()];
+    }
+
+    /**
+     * The raw Fabric metadata representing this instance.
+     */
+    get raw(): RawFabricMetadata {
+        return this._raw;
+    }
+
+    /**
+     * The custom payload attached to the Fabric metadata.
+     */
+    get customPayload(): FabricMetadataCustomPayload {
+        return getFabricMetadataCustomPayload(this._raw);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    getProjectId(platform: PlatformType): string {
+        return getProjectIdFromFabricMetadataCustomPayload(this.customPayload, platform) || this.id;
+    }
+}

tests/unit/loaders/fabric/fabric-metadata.spec.ts

@@ -0,0 +1,212 @@
+import { readFileSync } from "node:fs";
+import { resolve as resolvePath } from "node:path";
+import { DependencyType } from "@/dependencies/dependency-type";
+import { PlatformType } from "@/platforms/platform-type";
+import { RawFabricMetadata } from "@/loaders/fabric/raw-fabric-metadata";
+import { FabricMetadata } from "@/loaders/fabric/fabric-metadata";
+
+const RAW_METADATA: RawFabricMetadata = Object.freeze(JSON.parse(
+    readFileSync(resolvePath(__dirname, "../../../content/fabric/fabric.mod.json"), "utf8")
+));
+
+describe("FabricMetadata", () => {
+    describe("from", () => {
+        test("constructs new FabricMetadata instance using given raw metadata", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata).toBeInstanceOf(FabricMetadata);
+            expect(metadata.raw).toBe(RAW_METADATA);
+        });
+    });
+
+    describe("id", () => {
+        test("returns id of the mod", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.id).toBe("example-mod");
+        });
+    })
+
+    describe("name", () => {
+        test("returns name of the mod", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.name).toBe("Example Mod");
+        });
+    });
+
+    describe("version", () => {
+        test("returns version of the mod", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.version).toBe("0.1.0");
+        });
+    });
+
+    describe("loaders", () => {
+        test("returns 'fabric' by default", () => {
+            const metadata = FabricMetadata.from({} as RawFabricMetadata);
+
+            expect(metadata.loaders).toEqual(["fabric"]);
+        });
+
+        test("returns the same value as the 'loaders' field in the custom payload", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.loaders).toEqual(["fabric", "quilt"]);
+        });
+    });
+
+    describe("gameName", () => {
+        test("always returns 'minecraft'", () => {
+            expect(FabricMetadata.from({} as RawFabricMetadata).gameName).toBe("minecraft");
+            expect(FabricMetadata.from(RAW_METADATA).gameName).toBe("minecraft");
+        });
+    });
+
+    describe("gameVersions", () => {
+        test("returns an empty array if no dependencies were specified", () => {
+            const metadata = FabricMetadata.from({} as RawFabricMetadata);
+
+            expect(metadata.gameVersions).toEqual([]);
+        });
+
+        test("returns the same value as the 'minecraft' dependency", () => {
+            const metadata = FabricMetadata.from({ recommends: { minecraft: "1.16.5" } } as unknown as RawFabricMetadata);
+
+            expect(metadata.gameVersions).toEqual(["1.16.5"]);
+        });
+
+        test("returns the same values as the 'minecraft' dependency", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.gameVersions).toEqual(["1.17", "1.17.1"]);
+        });
+    });
+
+    describe("dependencies", () => {
+        test("returns an empty array if no dependencies were specified", () => {
+            const metadata = FabricMetadata.from({} as RawFabricMetadata);
+
+            expect(metadata.dependencies).toEqual([]);
+        });
+
+        test("returns dependencies if they were specified", () => {
+            const metadata = FabricMetadata.from({ breaks: RAW_METADATA.breaks } as RawFabricMetadata);
+
+            const dependencies = metadata.dependencies;
+
+            expect(dependencies).toHaveLength(1);
+            expect(dependencies[0]).toMatchObject({ id: "breaking-mod", versions: ["*"], type: DependencyType.INCOMPATIBLE });
+        });
+
+        test("special well-known dependency 'fabric' has custom 'fabric-api' alias", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            const dependencies = metadata.dependencies;
+
+            const fabric = dependencies.find(x => x.id === "fabric");
+            for (const platform of PlatformType.values()) {
+                expect(fabric?.getProjectId(platform)).toBe("fabric-api");
+            }
+        });
+
+        test("regular dependencies have no aliases", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            const dependencies = metadata.dependencies;
+            const regularDependencies = ["included-mod", "suggested-mod", "conflicting-mod", "breaking-mod"].map(id => dependencies.find(x => x.id === id));
+
+            for (const dependency of regularDependencies) {
+                for (const platform of PlatformType.values()) {
+                    expect(dependency?.getProjectId(platform)).toBe(dependency.id);
+                }
+            }
+        });
+
+        test("special dependencies ('fabricloader', 'minecraft', 'java') are ignored by default", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            const dependencies = metadata.dependencies;
+
+            expect(dependencies.find(x => x.id === "fabricloader")?.isIgnored()).toBe(true);
+            expect(dependencies.find(x => x.id === "minecraft")?.isIgnored()).toBe(true);
+            expect(dependencies.find(x => x.id === "java")?.isIgnored()).toBe(true);
+        });
+
+        test("regular dependencies are not ignored by default", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            const dependencies = metadata.dependencies;
+
+            expect(dependencies.find(x => x.id === "fabric")?.isIgnored()).toBe(false);
+            expect(dependencies.find(x => x.id === "included-mod")?.isIgnored()).toBe(false);
+            expect(dependencies.find(x => x.id === "suggested-mod")?.isIgnored()).toBe(false);
+            expect(dependencies.find(x => x.id === "conflicting-mod")?.isIgnored()).toBe(false);
+            expect(dependencies.find(x => x.id === "breaking-mod")?.isIgnored()).toBe(false);
+        });
+
+        test("returns dependencies merged with the 'dependencies' declaration from the custom payload", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            const dependencies = metadata.dependencies;
+
+            expect(dependencies).toHaveLength(9);
+            expect(dependencies.find(x => x.id === "fabricloader")).toMatchObject({ versions: [">=0.11.3"], type: DependencyType.REQUIRED });
+            expect(dependencies.find(x => x.id === "fabric")).toMatchObject({ versions: [">=0.40.0"], type: DependencyType.REQUIRED });
+            expect(dependencies.find(x => x.id === "minecraft")).toMatchObject({ versions: ["1.17", "1.17.1"], type: DependencyType.REQUIRED });
+            expect(dependencies.find(x => x.id === "java")).toMatchObject({ versions: [">=16"], type: DependencyType.REQUIRED });
+            expect(dependencies.find(x => x.id === "recommended-mod")).toMatchObject({ versions: ["0.2.0"], type: DependencyType.RECOMMENDED });
+            expect(dependencies.find(x => x.id === "included-mod")).toMatchObject({ versions: ["*"], type: DependencyType.EMBEDDED });
+            expect(dependencies.find(x => x.id === "suggested-mod")).toMatchObject({ versions: ["*"], type: DependencyType.OPTIONAL });
+            expect(dependencies.find(x => x.id === "conflicting-mod")).toMatchObject({ versions: ["<0.40.0"], type: DependencyType.CONFLICTING });
+            expect(dependencies.find(x => x.id === "breaking-mod")).toMatchObject({ versions: ["*"], type: DependencyType.INCOMPATIBLE });
+
+            const merged = dependencies.find(x => x.id === "recommended-mod");
+            expect(merged.getProjectId(PlatformType.MODRINTH)).toBe("AAAA");
+            expect(merged.getProjectId(PlatformType.CURSEFORGE)).toBe("42");
+            expect(merged.getProjectId(PlatformType.GITHUB)).toBe("v0.2.0");
+            expect(merged.isIgnored()).toBe(true);
+        });
+    });
+
+    describe("raw", () => {
+        test("returns the raw metadata oject this instance was created from", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.raw).toBe(RAW_METADATA);
+        });
+    });
+
+    describe("customPayload", () => {
+        test("returns an empty object by default", () => {
+            const metadata = FabricMetadata.from({} as RawFabricMetadata);
+
+            expect(metadata.customPayload).toEqual({});
+        });
+
+        test("return the custom payload if it was specified", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.customPayload?.loaders).toEqual(["fabric", "quilt"]);
+        });
+    });
+
+    describe("getProjectId", () => {
+        test("returns the mod id by default", () => {
+            const metadata = FabricMetadata.from({ id: "example-mod" } as RawFabricMetadata);
+
+            for (const platform of PlatformType.values()) {
+                expect(metadata.getProjectId(platform)).toBe("example-mod");
+            }
+        });
+
+        test("returns the same value as one specified in the custom payload", () => {
+            const metadata = FabricMetadata.from(RAW_METADATA);
+
+            expect(metadata.getProjectId(PlatformType.MODRINTH)).toBe("AANobbMI");
+            expect(metadata.getProjectId(PlatformType.CURSEFORGE)).toBe("394468");
+            expect(metadata.getProjectId(PlatformType.GITHUB)).toBe("mc1.18-0.4.0-alpha5");
+        });
+    });
+});