refactor, add preview

shared/utils/zip.js

@@ -0,0 +1,76 @@
+// @flow
+import path from "path";
+import JSZip, { ZipObject } from "jszip";
+
+export type Item = {|
+  path: string,
+  dir: string,
+  name: string,
+  depth: number,
+  metadata: Object,
+  type: "collection" | "document" | "attachment",
+  item: ZipObject,
+|};
+
+export async function parseOutlineExport(
+  input: File | Buffer
+): Promise<Item[]> {
+  const zip = await JSZip.loadAsync(input);
+
+  // this is so we can use async / await a little easier
+  let items: Item[] = [];
+  zip.forEach(async function (rawPath, item) {
+    const itemPath = rawPath.replace(/\/$/, "");
+    const dir = path.dirname(itemPath);
+    const name = path.basename(item.name);
+    const depth = itemPath.split("/").length - 1;
+
+    // known skippable items
+    if (itemPath.startsWith("__MACOSX") || itemPath.endsWith(".DS_Store")) {
+      return;
+    }
+
+    // attempt to parse extra metadata from zip comment
+    let metadata = {};
+    try {
+      metadata = item.comment ? JSON.parse(item.comment) : {};
+    } catch (err) {
+      console.log(
+        `ZIP comment found for ${item.name}, but could not be parsed as metadata: ${item.comment}`
+      );
+    }
+
+    if (depth === 0 && !item.dir) {
+      throw new Error(
+        "Root of zip file must only contain folders representing collections"
+      );
+    }
+
+    let type;
+    if (depth === 0 && item.dir && name) {
+      type = "collection";
+    }
+    if (depth > 0 && !item.dir && item.name.endsWith(".md")) {
+      type = "document";
+    }
+    if (depth > 0 && !item.dir && itemPath.includes("uploads")) {
+      type = "attachment";
+    }
+
+    if (!type) {
+      return;
+    }
+
+    items.push({
+      path: itemPath,
+      dir,
+      name,
+      depth,
+      type,
+      metadata,
+      item,
+    });
+  });
+
+  return items;
+}