Add non-persistent expiry lore using ProtocolLib packet injection

[Copilot]

Problem

Food Spoilage was permanently adding expiry date lore to all food items. This lore would persist even after removing the plugin from the server, causing confusion as items continued to display expiration dates that could never actually expire. This created a lasting impact on servers that could never be undone, making server owners hesitant to install the plugin.

Solution

Implemented packet-based lore injection using ProtocolLib to dynamically show expiry dates to players without permanently modifying items.

How It Works

With ProtocolLib installed:

1. Food items only store expiry data in NBT (PersistentDataContainer) - invisible to players
2. When packets containing items are sent to players, they are intercepted
3. Expiry lore is dynamically injected into the packet copy before reaching the client
4. The actual item on the server remains unchanged with no persistent lore
5. When the plugin is removed, items are clean and return to vanilla state

Without ProtocolLib (fallback):

• Plugin continues to function normally using persistent lore (legacy behavior)
• Warning is logged at startup recommending ProtocolLib installation
• Full backward compatibility maintained

Technical Implementation

New Components:

• PacketLoreService - Handles packet interception for WINDOW_ITEMS, SET_SLOT, and ENTITY_EQUIPMENT packets
• Helper methods in LocalTimeStampService for NBT-based timestamp retrieval and date formatting

Modified Behavior:

• assignTimeStamp() now conditionally sets lore based on ProtocolLib availability
• NBT data is always stored for expiry logic (required for plugin functionality)
• Lore is only added to items when ProtocolLib is not available

Benefits

✅ Clean Removal - Items return to vanilla state when plugin is removed
✅ No Permanent Impact - Server doesn't have leftover confusing data
✅ Flexible - Works with or without ProtocolLib (graceful degradation)
✅ Backward Compatible - Existing items with persistent lore continue to work
✅ Minimal Changes - Surgical modifications to only necessary code

Installation Notes

For the best experience, servers should install both:

1. Food Spoilage plugin
2. ProtocolLib (optional but recommended)

The plugin will automatically detect ProtocolLib and enable non-persistent lore. Without ProtocolLib, it falls back to persistent lore with appropriate warnings.

Backward Compatibility

• Items created before this update (with persistent lore) continue to work
• NBT data is always checked first for expiry information
• Lore parsing remains as fallback for legacy items
• No migration required

Fixes #181 (prevents the need to remove plugin due to persistent lore concerns)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• hub.spigotmc.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.base/java.nio.charset=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED -XX:MaxMetaspaceSize=256m -XX:+HeapDumpOnOutOfMemoryError -Xms256m -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-7.4.2-bin/48ivgl02cpt2ed3fh9dbalvx8/gradle-7.4.2/lib/gradle-launcher-7.4.2.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 7.4.2 (dns block)
• jitpack.io
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.base/java.nio.charset=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED -XX:MaxMetaspaceSize=256m -XX:+HeapDumpOnOutOfMemoryError -Xms256m -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-7.4.2-bin/48ivgl02cpt2ed3fh9dbalvx8/gradle-7.4.2/lib/gradle-launcher-7.4.2.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 7.4.2 (dns block)
• repo.rpkit.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.invoke=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.prefs/java.util.prefs=ALL-UNNAMED --add-opens java.base/java.nio.charset=ALL-UNNAMED --add-opens java.base/java.net=ALL-UNNAMED --add-opens java.base/java.util.concurrent.atomic=ALL-UNNAMED -XX:MaxMetaspaceSize=256m -XX:+HeapDumpOnOutOfMemoryError -Xms256m -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-7.4.2-bin/48ivgl02cpt2ed3fh9dbalvx8/gradle-7.4.2/lib/gradle-launcher-7.4.2.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 7.4.2 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Feature Request: Non-persistent item expiry lore</issue_title>
<issue_description>Food Spoilage gives all food items everywhere an expiration timestamp (via NBT data) which is just used by the plugin to know when the item expires. Food Spoilage also gives all food items expiration date lore text, which is visible to players and tells them when the item expires.

After testing Food Spoilage on my test server, it seems that the expiry date lore text that Food Spoilage applies to food items is applied permanently. Food items will continue to show their expiry date in their item lore even after removing Food Spoilage from the server. This is confusing, since Food Spoilage is no longer on the server. It is no longer possible for these items to expire, but they say they will expire still.

For years after Food Spoilage is removed, players will keep discovering items around the world that, for some reason, are special and have an expiration date (despite never actually expiring). Personally I do not feel safe installing a plugin I know will forever have a lasting impact on my server that can never be undone, such as this. Especially if it makes the server feel broken or janky.

On top of that, it is entirely possible that I may have to remove Food Spoilage at some point if it turns out I don't like something about it, or if I run into this bug: #181

I believe other plugins alter the packets sent to the player so that when the player receives the item's data, they receive data for the item WITH special lore, even though the server never actually added any lore to the item. I believe this is the optimal way to solve this problem.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #222

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