Initial commit

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+# Automatically build the project and run any configured tests for every push
+# and submitted pull request. This can help catch issues that only occur on
+# certain platforms or Java versions, and provides a first line of defence
+# against bad commits.
+
+name: build
+on: [pull_request, push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        # Use these Java versions
+        java: [
+          16    # Minimum supported by Minecraft
+        ]
+        # and run on both Linux and Windows
+        os: [ubuntu-20.04, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: checkout repository
+        uses: actions/checkout@v2
+      - name: validate gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+      - name: setup jdk ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: make gradle wrapper executable
+        if: ${{ runner.os != 'Windows' }}
+        run: chmod +x ./gradlew
+      - name: build
+        run: ./gradlew build
+      - name: capture build artifacts
+        if: ${{ runner.os == 'Linux' && matrix.java == '16' }} # Only upload artifacts built from latest java on one OS
+        uses: actions/upload-artifact@v2
+        with:
+          name: Artifacts
+          path: build/libs/

.gitignore

@@ -0,0 +1,33 @@
+# gradle
+
+.gradle/
+build/
+out/
+classes/
+
+# eclipse
+
+*.launch
+
+# idea
+
+.idea/
+*.iml
+*.ipr
+*.iws
+
+# vscode
+
+.settings/
+.vscode/
+bin/
+.classpath
+.project
+
+# macos
+
+*.DS_Store
+
+# fabric
+
+run/

LICENSE

@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
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+
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+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
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+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not
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+ vi. database rights (such as those arising under Directive 96/9/EC of the
+     European Parliament and of the Council of 11 March 1996 on the legal
+     protection of databases, and under any national implementation
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+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
+of action, whether now known or unknown (including existing as well as
+future claims and causes of action), in the Work (i) in all territories
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+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
+Related Rights in the Work (i) in all territories worldwide, (ii) for the
+maximum duration provided by applicable law or treaty (including future
+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
+    the present or absence of errors, whether or not discoverable, all to
+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
+    limitation any person's Copyright and Related Rights in the Work.
+    Further, Affirmer disclaims responsibility for obtaining any necessary
+    consents, permissions or other rights required for any use of the
+    Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.

README.md

@@ -0,0 +1,9 @@
+# Fabric Example Mod
+
+## Setup
+
+For setup instructions please see the [fabric wiki page](https://fabricmc.net/wiki/tutorial:setup) that relates to the IDE that you are using.
+
+## License
+
+This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.

build.gradle

@@ -0,0 +1,84 @@
+plugins {
+	id 'fabric-loom' version '0.8-SNAPSHOT'
+	id 'maven-publish'
+}
+
+sourceCompatibility = JavaVersion.VERSION_16
+targetCompatibility = JavaVersion.VERSION_16
+
+archivesBaseName = project.archives_base_name
+version = project.mod_version
+group = project.maven_group
+
+repositories {
+	// Add repositories to retrieve artifacts from in here.
+	// You should only use this when depending on other mods because
+	// Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
+	// See https://docs.gradle.org/current/userguide/declaring_repositories.html
+	// for more information about repositories.
+}
+
+dependencies {
+	// To change the versions see the gradle.properties file
+	minecraft "com.mojang:minecraft:${project.minecraft_version}"
+	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+
+	// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
+	// You may need to force-disable transitiveness on them.
+}
+
+processResources {
+	inputs.property "version", project.version
+
+	filesMatching("fabric.mod.json") {
+		expand "version": project.version
+	}
+}
+
+tasks.withType(JavaCompile).configureEach {
+	// ensure that the encoding is set to UTF-8, no matter what the system default is
+	// this fixes some edge cases with special characters not displaying correctly
+	// see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
+	// If Javadoc is generated, this must be specified in that task too.
+	it.options.encoding = "UTF-8"
+
+	// Minecraft 1.17 (21w19a) upwards uses Java 16.
+	it.options.release = 16
+}
+
+java {
+	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+	// if it is present.
+	// If you remove this line, sources will not be generated.
+	withSourcesJar()
+}
+
+jar {
+	from("LICENSE") {
+		rename { "${it}_${project.archivesBaseName}"}
+	}
+}
+
+// configure the maven publication
+publishing {
+	publications {
+		mavenJava(MavenPublication) {
+			// add all the jars that should be included when publishing to maven
+			artifact(remapJar) {
+				builtBy remapJar
+			}
+			artifact(sourcesJar) {
+				builtBy remapSourcesJar
+			}
+		}
+	}
+
+	// See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
+	repositories {
+		// Add repositories to publish to here.
+		// Notice: This block does NOT have the same function as the block in the top level.
+		// The repositories here will be used for publishing your artifact, not for
+		// retrieving dependencies.
+	}
+}

gradle.properties

@@ -0,0 +1,11 @@
+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+# Fabric Properties
+# check these on https://fabricmc.net/versions.html
+minecraft_version=1.17
+yarn_mappings=1.17+build.13
+loader_version=0.11.6
+# Mod Properties
+mod_version=1.0.2
+maven_group=net.lionarius
+archives_base_name=skin-restorer

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        maven {
+            name = 'Fabric'
+            url = 'https://maven.fabricmc.net/'
+        }
+        gradlePluginPortal()
+    }
+}

src/main/java/net/lionarius/skinrestorer/MineskinSkinProvider.java

@@ -0,0 +1,31 @@
+package net.lionarius.skinrestorer;
+
+import com.google.gson.JsonObject;
+import com.mojang.authlib.properties.Property;
+import net.lionarius.skinrestorer.enums.SkinVariant;
+import net.lionarius.skinrestorer.util.JsonUtils;
+import net.lionarius.skinrestorer.util.WebUtils;
+
+import java.io.IOException;
+import java.net.URL;
+
+public class MineskinSkinProvider {
+
+    private static final String API = "https://api.mineskin.org/generate/url";
+    private static final String USER_AGENT = "SkinRestorer";
+    private static final String TYPE = "application/json";
+
+    public static Property getSkin(String url, SkinVariant variant) {
+        try {
+            String input = ("{\"variant\":\"%s\",\"name\":\"%s\",\"visibility\":%d,\"url\":\"%s\"}")
+                    .formatted(variant.toString(), "none", 1, url);
+
+            JsonObject texture = JsonUtils.parseJson(WebUtils.POSTRequest(new URL(API), USER_AGENT, TYPE, TYPE, input))
+                    .getAsJsonObject("data").getAsJsonObject("texture");
+
+            return new Property("textures", texture.get("value").getAsString(), texture.get("signature").getAsString());
+        } catch (IOException e) {
+            return null;
+        }
+    }
+}

src/main/java/net/lionarius/skinrestorer/MojangSkinProvider.java

@@ -0,0 +1,33 @@
+package net.lionarius.skinrestorer;
+
+import com.google.gson.JsonObject;
+import com.mojang.authlib.properties.Property;
+import net.lionarius.skinrestorer.util.JsonUtils;
+import net.lionarius.skinrestorer.util.WebUtils;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.UUID;
+
+public class MojangSkinProvider {
+
+    private static final String API = "https://api.mojang.com/users/profiles/minecraft/";
+    private static final String SESSION_SERVER = "https://sessionserver.mojang.com/session/minecraft/profile/";
+
+    public static Property getSkin(String name) {
+        try {
+            UUID uuid = getUUID(name);
+            JsonObject texture = JsonUtils.parseJson(WebUtils.GETRequest(new URL(SESSION_SERVER + uuid + "?unsigned=false")))
+                    .getAsJsonArray("properties").get(0).getAsJsonObject();
+
+            return new Property("textures", texture.get("value").getAsString(), texture.get("signature").getAsString());
+        } catch (IOException e) {
+            return null;
+        }
+    }
+
+    private static UUID getUUID(String name) throws IOException {
+        return UUID.fromString(JsonUtils.parseJson(WebUtils.GETRequest(new URL(API + name))).get("id").getAsString()
+                .replaceFirst("(\\p{XDigit}{8})(\\p{XDigit}{4})(\\p{XDigit}{4})(\\p{XDigit}{4})(\\p{XDigit}+)", "$1-$2-$3-$4-$5"));
+    }
+}

src/main/java/net/lionarius/skinrestorer/SkinIO.java

@@ -0,0 +1,27 @@
+package net.lionarius.skinrestorer;
+
+import com.mojang.authlib.properties.Property;
+import net.lionarius.skinrestorer.util.FileUtils;
+import net.lionarius.skinrestorer.util.JsonUtils;
+
+import java.nio.file.Path;
+import java.util.UUID;
+
+public class SkinIO {
+
+    private static final String FILE_EXTENSION = ".json";
+
+    private final Path savePath;
+
+    public SkinIO(Path savePath) {
+        this.savePath = savePath;
+    }
+
+    public Property loadSkin(UUID uuid) {
+        return JsonUtils.fromJson(FileUtils.readFile(savePath.resolve(uuid + FILE_EXTENSION).toFile()), Property.class);
+    }
+
+    public void saveSkin(UUID uuid, Property skin) {
+        FileUtils.writeFile(savePath.toFile(), uuid + FILE_EXTENSION, JsonUtils.toJson(skin));
+    }
+}

src/main/java/net/lionarius/skinrestorer/SkinRestorer.java

@@ -0,0 +1,18 @@
+package net.lionarius.skinrestorer;
+
+import net.fabricmc.api.DedicatedServerModInitializer;
+import net.fabricmc.loader.api.FabricLoader;
+
+public class SkinRestorer implements DedicatedServerModInitializer {
+
+    private static SkinStorage skinStorage;
+
+    public static SkinStorage getSkinStorage() {
+        return skinStorage;
+    }
+
+    @Override
+    public void onInitializeServer() {
+        skinStorage = new SkinStorage(new SkinIO(FabricLoader.getInstance().getConfigDir().resolve("skinrestorer")));
+    }
+}

src/main/java/net/lionarius/skinrestorer/SkinStorage.java

@@ -0,0 +1,39 @@
+package net.lionarius.skinrestorer;
+
+import com.mojang.authlib.properties.Property;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class SkinStorage {
+
+    private final Map<UUID, Property> skinMap = new HashMap<>();
+    private final SkinIO skinIO;
+
+    public SkinStorage(SkinIO skinIO) {
+        this.skinIO = skinIO;
+    }
+
+    public Property getSkin(UUID uuid) {
+        if (!skinMap.containsKey(uuid)) {
+            Property skin = skinIO.loadSkin(uuid);
+            setSkin(uuid, skin);
+        }
+
+        return skinMap.get(uuid);
+    }
+
+    public void removeSkin(UUID uuid) {
+        if (skinMap.containsKey(uuid)) {
+            skinIO.saveSkin(uuid, skinMap.get(uuid));
+        }
+    }
+
+    public void setSkin(UUID uuid, Property skin) {
+        if (skin == null)
+            skin = new Property("textures", "", "");
+
+        skinMap.put(uuid, skin);
+    }
+}

src/main/java/net/lionarius/skinrestorer/command/SkinCommand.java

@@ -0,0 +1,84 @@
+package net.lionarius.skinrestorer.command;
+
+import com.mojang.authlib.properties.Property;
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.arguments.StringArgumentType;
+import net.lionarius.skinrestorer.MineskinSkinProvider;
+import net.lionarius.skinrestorer.MojangSkinProvider;
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.lionarius.skinrestorer.enums.SkinVariant;
+import net.minecraft.command.argument.EntityArgumentType;
+import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.LiteralText;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.function.Supplier;
+
+import static net.minecraft.server.command.CommandManager.argument;
+import static net.minecraft.server.command.CommandManager.literal;
+
+public class SkinCommand {
+
+    public static void register(CommandDispatcher<ServerCommandSource> dispatcher) {
+        dispatcher.register(literal("skin")
+                .then(literal("set")
+                        .then(literal("mojang")
+                                .then(argument("skin_name", StringArgumentType.word())
+                                        .executes(context ->
+                                                skinAction(Collections.singleton(context.getSource().getPlayer()), false,
+                                                        () -> MojangSkinProvider.getSkin(StringArgumentType.getString(context, "skin_name"))))
+                                        .then(argument("targets", EntityArgumentType.players()).requires(source -> source.hasPermissionLevel(3))
+                                                .executes(context ->
+                                                        skinAction(EntityArgumentType.getPlayers(context, "targets"), true,
+                                                                () -> MojangSkinProvider.getSkin(StringArgumentType.getString(context, "skin_name")))))))
+                        .then(literal("web")
+                                .then(literal("classic")
+                                        .then(argument("url", StringArgumentType.string())
+                                                .executes(context ->
+                                                        skinAction(Collections.singleton(context.getSource().getPlayer()), false,
+                                                                () -> MineskinSkinProvider.getSkin(StringArgumentType.getString(context, "url"), SkinVariant.CLASSIC)))
+                                                .then(argument("targets", EntityArgumentType.players()).requires(source -> source.hasPermissionLevel(3))
+                                                        .executes(context ->
+                                                                skinAction(EntityArgumentType.getPlayers(context, "targets"), true,
+                                                                        () -> MineskinSkinProvider.getSkin(StringArgumentType.getString(context, "url"), SkinVariant.CLASSIC))))))
+                                .then(literal("slim")
+                                        .then(argument("url", StringArgumentType.string())
+                                                .executes(context ->
+                                                        skinAction(Collections.singleton(context.getSource().getPlayer()), false,
+                                                                () -> MineskinSkinProvider.getSkin(StringArgumentType.getString(context, "url"), SkinVariant.SLIM)))
+                                                .then(argument("targets", EntityArgumentType.players()).requires(source -> source.hasPermissionLevel(3))
+                                                        .executes(context ->
+                                                                skinAction(EntityArgumentType.getPlayers(context, "targets"), true,
+                                                                        () -> MineskinSkinProvider.getSkin(StringArgumentType.getString(context, "url"), SkinVariant.SLIM))))))))
+                .then(literal("clear")
+                        .executes(context ->
+                                skinAction(Collections.singleton(context.getSource().getPlayer()), false,
+                                        () -> null))
+                        .then(argument("targets", EntityArgumentType.players()).executes(context ->
+                                skinAction(EntityArgumentType.getPlayers(context, "targets"), true,
+                                        () -> null))))
+        );
+    }
+
+    private static int skinAction(Collection<ServerPlayerEntity> targets, boolean setByOperator, Supplier<Property> skinSupplier) {
+        new Thread(() -> {
+            if (!setByOperator)
+                targets.stream().findFirst().get().sendMessage(new LiteralText("§6[SkinRestorer]§f Downloading skin."), true);
+
+            Property skin = skinSupplier.get();
+
+            for (ServerPlayerEntity player : targets) {
+                SkinRestorer.getSkinStorage().setSkin(player.getUuid(), skin);
+
+                if (setByOperator)
+                    player.sendMessage(new LiteralText("§a[SkinRestorer]§f Operator changed your skin. You need to reconnect to apply it."), true);
+                else
+                    player.sendMessage(new LiteralText("§a[SkinRestorer]§f You need to reconnect to apply skin."), true);
+            }
+        }).start();
+
+        return targets.size();
+    }
+}

src/main/java/net/lionarius/skinrestorer/enums/SkinVariant.java

@@ -0,0 +1,18 @@
+package net.lionarius.skinrestorer.enums;
+
+public enum SkinVariant {
+
+    CLASSIC("classic"),
+    SLIM("slim");
+
+    private final String name;
+
+    SkinVariant(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}

src/main/java/net/lionarius/skinrestorer/mixin/CommandManagerMixin.java

@@ -0,0 +1,25 @@
+package net.lionarius.skinrestorer.mixin;
+
+import com.mojang.brigadier.CommandDispatcher;
+import net.lionarius.skinrestorer.command.SkinCommand;
+import net.minecraft.server.command.CommandManager;
+import net.minecraft.server.command.ServerCommandSource;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(CommandManager.class)
+public abstract class CommandManagerMixin {
+
+    @Final
+    @Shadow
+    private CommandDispatcher<ServerCommandSource> dispatcher;
+
+    @Inject(method = "<init>", at = @At(value = "TAIL"))
+    private void init(CommandManager.RegistrationEnvironment environment, CallbackInfo ci) {
+        SkinCommand.register(dispatcher);
+    }
+}

src/main/java/net/lionarius/skinrestorer/mixin/PlayerManagerMixin.java

@@ -0,0 +1,49 @@
+package net.lionarius.skinrestorer.mixin;
+
+import com.mojang.authlib.properties.Property;
+import net.lionarius.skinrestorer.MojangSkinProvider;
+import net.lionarius.skinrestorer.SkinRestorer;
+import net.minecraft.network.ClientConnection;
+import net.minecraft.server.PlayerManager;
+import net.minecraft.server.network.ServerPlayerEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.List;
+import java.util.Objects;
+
+@Mixin(PlayerManager.class)
+public abstract class PlayerManagerMixin {
+
+    private static void applySkin(ServerPlayerEntity playerEntity, Property skin) {
+        playerEntity.getGameProfile().getProperties().removeAll("textures");
+        playerEntity.getGameProfile().getProperties().put("textures", skin);
+    }
+
+    @Shadow
+    public abstract List<ServerPlayerEntity> getPlayerList();
+
+    @Inject(method = "onPlayerConnect", at = @At(value = "HEAD"))
+    private void onPlayerConnect(ClientConnection connection, ServerPlayerEntity player, CallbackInfo ci) {
+        Property skin = SkinRestorer.getSkinStorage().getSkin(player.getUuid());
+        if (Objects.equals(skin.getValue(), "")) {
+            skin = MojangSkinProvider.getSkin(player.getGameProfile().getName());
+        }
+        applySkin(player, skin);
+    }
+
+    @Inject(method = "remove", at = @At("TAIL"))
+    private void remove(ServerPlayerEntity player, CallbackInfo ci) {
+        SkinRestorer.getSkinStorage().removeSkin(player.getUuid());
+    }
+
+    @Inject(method = "disconnectAllPlayers", at = @At("HEAD"))
+    private void disconnectAllPlayers(CallbackInfo ci) {
+        for (ServerPlayerEntity player : getPlayerList()) {
+            SkinRestorer.getSkinStorage().removeSkin(player.getUuid());
+        }
+    }
+}

src/main/java/net/lionarius/skinrestorer/util/FileUtils.java

@@ -0,0 +1,32 @@
+package net.lionarius.skinrestorer.util;
+
+import java.io.*;
+
+public class FileUtils {
+
+    public static String readFile(File file) {
+        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
+            return StringUtils.readString(reader);
+        } catch (IOException e) {
+            return null;
+        }
+    }
+
+    public static boolean writeFile(File path, String fileName, String content) {
+        try {
+            if (!path.exists())
+                path.mkdirs();
+
+            File file = new File(path, fileName);
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            try (FileWriter writer = new FileWriter(file)) {
+                writer.write(content);
+            }
+            return true;
+        } catch (IOException e) {
+            return false;
+        }
+    }
+}

src/main/java/net/lionarius/skinrestorer/util/JsonUtils.java

@@ -0,0 +1,23 @@
+package net.lionarius.skinrestorer.util;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+
+public class JsonUtils {
+
+    private static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
+
+    public static <T> T fromJson(String json, Class<T> clazz) {
+        return GSON.fromJson(json, clazz);
+    }
+
+    public static String toJson(Object obj) {
+        return GSON.toJson(obj);
+    }
+
+    public static JsonObject parseJson(String json) {
+        return new JsonParser().parse(json).getAsJsonObject();
+    }
+}

src/main/java/net/lionarius/skinrestorer/util/StringUtils.java

@@ -0,0 +1,17 @@
+package net.lionarius.skinrestorer.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+
+public class StringUtils {
+
+    public static String readString(BufferedReader reader) throws IOException {
+        String inputLine;
+        StringBuilder response = new StringBuilder();
+
+        while ((inputLine = reader.readLine()) != null) {
+            response.append(inputLine);
+        }
+        return response.toString();
+    }
+}

src/main/java/net/lionarius/skinrestorer/util/WebUtils.java

@@ -0,0 +1,42 @@
+package net.lionarius.skinrestorer.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+public class WebUtils {
+
+    public static String POSTRequest(URL url, String userAgent, String contentType, String responseType, String input) throws IOException {
+        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+
+        connection.setRequestMethod("POST");
+        connection.setRequestProperty("Content-Type", contentType);
+        connection.setRequestProperty("Accept", responseType);
+        connection.setRequestProperty("User-Agent", userAgent);
+        connection.setDoOutput(true);
+        connection.setDoInput(true);
+
+        try (OutputStream os = connection.getOutputStream()) {
+            os.write(input.getBytes(StandardCharsets.UTF_8), 0, input.length());
+        }
+
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
+            return StringUtils.readString(br);
+        }
+    }
+
+    public static String GETRequest(URL url) throws IOException {
+        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+
+        connection.setRequestMethod("GET");
+        connection.setDoOutput(true);
+
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
+            return StringUtils.readString(br);
+        }
+    }
+}

src/main/resources/fabric.mod.json

@@ -0,0 +1,30 @@
+{
+  "schemaVersion": 1,
+  "id": "skinrestorer",
+  "version": "${version}",
+
+  "name": "Skin Restorer",
+  "description": "",
+  "authors": [
+    "Lionarius"
+  ],
+  "contact": {},
+
+  "license": "MIT",
+
+  "environment": "server",
+  "entrypoints": {
+    "server": [
+      "net.lionarius.skinrestorer.SkinRestorer"
+    ]
+  },
+  "mixins": [
+    "skinrestorer.mixins.json"
+  ],
+
+  "depends": {
+    "fabricloader": ">=0.11.3",
+    "minecraft": "*",
+    "java": ">=8"
+  }
+}

src/main/resources/skinrestorer.mixins.json

@@ -0,0 +1,13 @@
+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "net.lionarius.skinrestorer.mixin",
+  "compatibilityLevel": "JAVA_16",
+  "mixins": [
+    "CommandManagerMixin",
+    "PlayerManagerMixin"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}