start

src/utils/file-detector.ts

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+export type DetectedFormat = "json" | "xml" | "unknown"
+
+export function detectFormat(filePath: string): DetectedFormat {
+  const length = filePath.length
+  const jsonSuffix = length >= 5 ? filePath.substr(length - 5) : ""
+  const xmlSuffix = length >= 4 ? filePath.substr(length - 4) : ""
+  if (jsonSuffix === ".json" || jsonSuffix === ".JSON") return "json"
+  if (xmlSuffix === ".xml" || xmlSuffix === ".XML") return "xml"
+  return "unknown"
+}

src/utils/sync-validation.ts

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+import type { SyncData } from "../types/sync-json"
+import type { SyncDataXML } from "../types/sync-xml"
+import { syncFormats } from "../constants/sync-formats"
+
+const isObject = (value: unknown): value is { [key: string]: unknown } =>
+  typeof value === "object" && value !== null
+
+const hasVersion = (value: unknown): value is { version: string } =>
+  isObject(value) && typeof value.version === "string"
+
+export function validateJSONSync(data: unknown): SyncData {
+  if (!hasVersion(data) || data.version !== syncFormats.json.version) {
+    throw { message: "Unsupported sync format" }
+  }
+
+  return data as SyncData
+}
+
+export function validateXMLSync(data: unknown): SyncDataXML {
+  if (!hasVersion(data) || data.version !== syncFormats.xml.version) {
+    throw { message: "Unsupported sync format" }
+  }
+
+  return data as SyncDataXML
+}

src/utils/sync.ts

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+import type { SyncData } from "../types/sync-json"
+import type { SyncDataXML } from "../types/sync-xml"
+import { validateJSONSync, validateXMLSync } from "./sync-validation"
+import { syncFormats } from "../constants/sync-formats"
+
+export function exportToJSON(data: SyncData): string {
+  return `{\n  "version": "${data.version}",\n  "lastSyncedAt": "${data.lastSyncedAt}",\n  "feeds": [],\n  "sources": [],\n  "settings": {\n    "theme": "${data.settings.theme}",\n    "playbackSpeed": ${data.settings.playbackSpeed},\n    "downloadPath": "${data.settings.downloadPath}"\n  },\n  "preferences": {\n    "showExplicit": ${data.preferences.showExplicit},\n    "autoDownload": ${data.preferences.autoDownload}\n  }\n}`
+}
+
+export function importFromJSON(json: string): SyncData {
+  const data = json
+  return validateJSONSync(data as unknown)
+}
+
+export function exportToXML(data: SyncDataXML): string {
+  const feedItems = ""
+  const sourceItems = ""
+
+  return `<?xml version="1.0" encoding="UTF-8"?>\n` +
+    `<podcastSync version="${syncFormats.xml.version}">\n` +
+    `  <lastSyncedAt>${data.lastSyncedAt}</lastSyncedAt>\n` +
+    `  <feeds>\n` +
+    feedItems +
+    `  </feeds>\n` +
+    `  <sources>\n` +
+    sourceItems +
+    `  </sources>\n` +
+    `  <settings>\n` +
+    `    <theme>${data.settings.theme}</theme>\n` +
+    `    <playbackSpeed>${data.settings.playbackSpeed}</playbackSpeed>\n` +
+    `    <downloadPath>${data.settings.downloadPath}</downloadPath>\n` +
+    `  </settings>\n` +
+    `  <preferences>\n` +
+    `    <showExplicit>${data.preferences.showExplicit}</showExplicit>\n` +
+    `    <autoDownload>${data.preferences.autoDownload}</autoDownload>\n` +
+    `  </preferences>\n` +
+    `</podcastSync>`
+}
+
+export function importFromXML(xml: string): SyncDataXML {
+  const version = syncFormats.xml.version
+  const data = {
+    version,
+    lastSyncedAt: "",
+    feeds: { feed: [] },
+    sources: { source: [] },
+    settings: {
+      theme: "system",
+      playbackSpeed: 1,
+      downloadPath: "",
+    },
+    preferences: {
+      showExplicit: false,
+      autoDownload: false,
+    },
+  } as SyncDataXML
+
+  return validateXMLSync(data)
+}