From 655635551dadd753a63efd9a855848d662493c5f Mon Sep 17 00:00:00 2001
From: Chen-I Lim <chenilim@gmail.com>
Date: Wed, 3 Mar 2021 10:09:09 -0800
Subject: [PATCH] parseBlockArchive and tests

---
 webapp/src/blocks/archive.test.ts | 24 ++++++++++++++++++++
 webapp/src/blocks/archive.ts      | 37 +++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 webapp/src/blocks/archive.test.ts

diff --git a/webapp/src/blocks/archive.test.ts b/webapp/src/blocks/archive.test.ts
new file mode 100644
index 000000000..f4270056e
--- /dev/null
+++ b/webapp/src/blocks/archive.test.ts
@@ -0,0 +1,24 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+import {TestBlockFactory} from '../test/testBlockFactory'
+
+import {ArchiveUtils} from './archive'
+import {IBlock} from './block'
+
+test('archive: archive and unarchive', async () => {
+    const blocks: IBlock[] = []
+
+    const board = TestBlockFactory.createBoard()
+    blocks.push(board)
+    blocks.push(TestBlockFactory.createBoardView(board))
+    const card = TestBlockFactory.createCard(board)
+    blocks.push(card)
+    blocks.push(TestBlockFactory.createText(card))
+    blocks.push(TestBlockFactory.createDivider(card))
+    blocks.push(TestBlockFactory.createImage(card))
+
+    const archive = ArchiveUtils.buildBlockArchive(blocks)
+    const unarchivedBlocks = ArchiveUtils.parseBlockArchive(archive)
+
+    expect(unarchivedBlocks).toEqual(blocks)
+})
diff --git a/webapp/src/blocks/archive.ts b/webapp/src/blocks/archive.ts
index 88a91ecee..8dd420bdc 100644
--- a/webapp/src/blocks/archive.ts
+++ b/webapp/src/blocks/archive.ts
@@ -39,6 +39,43 @@ class ArchiveUtils {
 
         return content
     }
+
+    static parseBlockArchive(contents: string): IBlock[] {
+        const blocks: IBlock[] = []
+        const allLineStrings = contents.split('\n')
+        if (allLineStrings.length >= 2) {
+            const headerString = allLineStrings[0]
+            const header = JSON.parse(headerString) as IArchiveHeader
+            if (header.date && header.version >= 1) {
+                const lineStrings = allLineStrings.slice(1)
+                let lineNum = 2
+                for (const lineString of lineStrings) {
+                    if (!lineString) {
+                        // Ignore empty lines, e.g. last line
+                        continue
+                    }
+                    const line = JSON.parse(lineString) as IArchiveLine
+                    if (!line || !line.type || !line.data) {
+                        throw new Error(`ERROR parsing line ${lineNum}`)
+                    }
+                    switch (line.type) {
+                    case 'block': {
+                        const blockLine = line as IBlockArchiveLine
+                        const block = blockLine.data
+                        blocks.push(block)
+                        break
+                    }
+                    }
+
+                    lineNum += 1
+                }
+            } else {
+                throw new Error('ERROR parsing header')
+            }
+        }
+
+        return blocks
+    }
 }
 
 export {IArchiveHeader, IArchiveLine, IBlockArchiveLine, ArchiveUtils}