refactor to read more from package.json

src/domain/ProjectInformation.ts

@@ -0,0 +1,55 @@
+import { IProjectInformation } from './IProjectInformation';
+import { OperatingSystem } from './OperatingSystem';
+
+export class ProjectInformation implements IProjectInformation {
+    public readonly repositoryWebUrl: string;
+    constructor(
+        public readonly name: string,
+        public readonly version: string,
+        public readonly repositoryUrl: string,
+        public readonly homepage: string,
+        ) {
+        if (!name) {
+            throw new Error('name is undefined');
+        }
+        if (!version || +version <= 0) {
+            throw new Error('version should be higher than zero');
+        }
+        if (!repositoryUrl) {
+            throw new Error('repositoryUrl is undefined');
+        }
+        if (!homepage) {
+            throw new Error('homepage is undefined');
+        }
+        this.repositoryWebUrl = getWebUrl(this.repositoryUrl);
+    }
+    public getDownloadUrl(os: OperatingSystem): string {
+        return `${this.repositoryWebUrl}/releases/download/${this.version}/${getFileName(os, this.version)}`;
+    }
+    public get feedbackUrl(): string {
+        return `${this.repositoryWebUrl}/issues`;
+    }
+    public get releaseUrl(): string {
+        return `${this.repositoryWebUrl}/releases/tag/${this.version}`;
+    }
+}
+
+function getWebUrl(gitUrl: string) {
+    if (gitUrl.endsWith('.git')) {
+      return gitUrl.substring(0, gitUrl.length - 4);
+    }
+    return gitUrl;
+}
+
+function getFileName(os: OperatingSystem, version: string): string {
+    switch (os) {
+        case OperatingSystem.Linux:
+            return `privacy.sexy-${version}.AppImage`;
+        case OperatingSystem.macOS:
+            return `privacy.sexy-${version}.dmg`;
+        case OperatingSystem.Windows:
+            return `privacy.sexy-Setup-${version}.exe`;
+        default:
+            throw new Error(`Unsupported os: ${OperatingSystem[os]}`);
+    }
+}