From df487791c91a5aa1a9a3b4e1a6c9ce17a58eafe6 Mon Sep 17 00:00:00 2001
From: BonfaceKilz
Date: Mon, 4 Oct 2021 12:21:16 +0300
Subject: Modify resource editing script to enable data backups & restoration

---
 scripts/authentication/resource.py | 101 ++++++++++++++++++++++++++++++++-----
 1 file changed, 88 insertions(+), 13 deletions(-)

(limited to 'scripts/authentication')

diff --git a/scripts/authentication/resource.py b/scripts/authentication/resource.py
index 75ef9e93..8fcf09d7 100644
--- a/scripts/authentication/resource.py
+++ b/scripts/authentication/resource.py
@@ -1,25 +1,100 @@
-"""A script that adds the group: 'editors' to every
-resource. 'editors' should have the right to edit both metadata and
-data.
+"""A script that:
 
-To use this script, simply run:
+- Optionally restores data from a json file.
+
+- By default, without any args provided, adds the group: 'editors' to
+every resource. 'editors' should have the right to edit both metadata
+and data.
+
+- Optionally creates a back-up every time you edit a resource.
+
+
+To restore a back-up:
+
+.. code-block:: python
+   python resource.py --restore <PATH/TO/RESOURCE/BACK-UP/FILE>
+
+To add editors to every resource without creating a back-up:
 
 .. code-block:: python
    python resource.py
 
+To add editors to every resource while creating a back-up before any
+destructive edits:
+
+.. code-block:: python
+   python resource.py --enable-backup
+
 """
+import argparse
 import json
 import redis
+import os
+
+from datetime import datetime
+
+
+def recover_hash(name: str, file_path: str, set_function) -> bool:
+    """Recover back-ups using the `set_function`
+
+    Parameters:
+
+    - `name`: Redis hash where `file_path` will be restored
+
+    - `file_path`: File path where redis hash is sourced from
+
+    - `set_function`: Function used to do the Redis backup for
+      example: HSET
+
+    """
+    try:
+        with open(file_path, "r") as f:
+            resources = json.load(f)
+            for resource_id, resource in resources.items():
+                set_function(name=name,
+                             key=resource_id,
+                             value=resource)
+            return True
+    except Exception as e:
+        print(e)
+        return False
 
 
 if __name__ == "__main__":
-    REDIS_CONN = redis.Redis()
-    resources = REDIS_CONN.hgetall("resources_clone")
-    for resource_id, resource in resources.items():
-        deserialized_resource = json.loads(resource)
-        deserialized_resource["group_masks"] = {
-            "editors": {"metadata": "edit",
-                        "data": "edit"}}
-        REDIS_CONN.hset("resources_clone",
+    # Initialising the parser CLI arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--restore",
+                        help="Restore from a given backup")
+    parser.add_argument("--enable-backup", action="store_true",
+                        help="Create a back up before edits")
+    args = parser.parse_args()
+
+    if args.restore:
+        if recover_hash(name="resources",
+                        file_path=args.back_up,
+                        set_function=redis.Redis(decode_responses=True).hset):
+            exit(f"\n Done restoring {args.back_up}!\n")
+        else:
+            exit(f"\n There was an error restoring {args.back_up}!\n")
+
+    REDIS_CONN = redis.Redis(decode_responses=True)
+    RESOURCES = REDIS_CONN.hgetall("resources")
+    BACKUP_DIR = os.path.join(os.getenv("HOME"), "redis")
+    if args.enable_backup:
+        FILENAME = ("resources-"
+                    f"{datetime.now().strftime('%Y-%m-%d-%I:%M:%S-%p')}"
+                    ".json")
+        if not os.path.exists(BACKUP_DIR):
+            os.mkdir(BACKUP_DIR)
+        with open(os.path.join(BACKUP_DIR, FILENAME), "w") as f:
+            json.dump(RESOURCES, f, indent=4)
+        print(f"\nDone backing upto {FILENAME}")
+
+    for resource_id, resource in RESOURCES.items():
+        _resource = json.loads(resource)  # str -> dict conversion
+        _resource["group_masks"] = {"editors": {"metadata": "edit",
+                                                "data": "edit"}}
+        REDIS_CONN.hset("resources",
                         resource_id,
-                        json.dumps(deserialized_resource))
+                        json.dumps(_resource))
+    exit("Done updating `resources`\n")
-- 
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