init

Dockerfile

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+FROM python:latest
+
+RUN pip install requests
+COPY get_server.py get_server.py
+RUN chmod +x get_server.py
+WORKDIR /downloads
+
+CMD [ "/get_server.py" ]
+ENTRYPOINT ["python"]

IMAGE

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+ducoterra/get-minecraft

Makefile

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+SHELL := /bin/bash
+
+IMAGE ?= $(shell cat IMAGE):$(shell cat VERSION)
+IMAGE_LATEST ?= $(shell cat IMAGE):latest
+
+.PHONY: buildx-context
+buildx-context:
+	docker buildx create --name arm64 --use --platform linux/amd64,linux/arm64,linux/arm/v8
+
+.PHONY: build
+build:
+	@docker buildx build --platform linux/amd64,linux/arm64 . -t $(IMAGE)
+	@docker buildx build --platform linux/amd64,linux/arm64 . -t $(IMAGE_LATEST) 
+
+.PHONY: push
+push:
+	@docker push $(IMAGE)
+	@docker push $(IMAGE_LATEST)

README.md

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+# Minecraft Server Getter
+
+Get the url for any minecraft server version
+
+## Usage
+
+### Python
+
+Since this script is designed to be used in Docker it works with
+environment variables. Set SERVER_VERSION=<desired version> and
+get_server.py will write a file called "SERVER_VERSION" with the url
+to download the version requested.
+
+```bash
+export SERVER_VERSION=1.16.4
+python get_server.py
+```
+
+### Docker
+
+This is the intended way to run get_server. The get_server image saves
+the SERVER_VERSION file to /downloads. Mounting /downloads to `pwd` will
+allow the image to write to your current directory.
+
+```bash
+docker run -it -e SERVER_VERSION=1.16.4 -v $(pwd):/downloads ducoterra/get-minecraft:latest
+```

SERVER_VERSION

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+https://launchermeta.mojang.com/v1/packages/584f4f319f0acc2f8c9a7d992ae20b95f425c1c5/1.16.4.json

VERSION

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+1.0.0

get_server.py

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+import requests
+import json
+import os
+
+LATEST = "latest"
+RELEASE = "release"
+SNAPSHOT = "snapshot"
+REQUESTED_VERSION = os.getenv("SERVER_VERSION", LATEST)
+VERSION_FILE = "SERVER_VERSION"
+
+def get_latest_version(latest):
+    return latest.get(RELEASE)
+
+def get_version(versions, latest, id):
+    if id == LATEST:
+        id = get_latest_version(latest)
+
+    result = list(filter(
+        lambda item: item.get('id') == id,
+        versions
+    ))
+    if len(result) == 1:
+        return result[0]
+    elif len(result) > 1:
+        raise ValueError(f"Version {id} didn't return 1 result, it returned {len(result)}!")
+    else:
+        raise ValueError(f"Version {id} had no matches.")
+
+def write_version_file(version):
+    with open(VERSION_FILE, "w") as f:
+        return f.write(version.get('url'))
+
+if __name__ == "__main__":
+    version_manifest = requests.get("https://launchermeta.mojang.com/mc/game/version_manifest_v2.json")
+    version_json = json.loads(version_manifest.text)
+    versions = version_json.get('versions')
+    latest = version_json.get(LATEST)
+
+    print(f"Attempting to get version {REQUESTED_VERSION}.")
+    version = get_version(versions, latest, REQUESTED_VERSION)
+    print(f"Found, writing url to VERSION file.")
+    write_version_file(version)