initial commit

.gitignore

@@ -0,0 +1,8 @@
+.idea
+.gradle
+*iml
+build
+/*.properties
+out
+*.log
+.DS_Store

LICENSE

@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
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+
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+      on behalf of whom a Contribution has been received by Licensor and
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+
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+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+
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+          notices within Derivative Works that You distribute, alongside
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
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+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
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+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS

README.txt

@@ -0,0 +1,17 @@
+# Parrot
+
+Telegram bot to forward messages pseudonymously to a group.
+
+## Running
+
+First set enviroment variables:
+```
+PARROT_BOT_TOKEN=XXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+PARROT_GROUP_ID=-XXXXXXXXX
+```
+
+Then run with
+```
+./parrot
+```
+

build.gradle

@@ -0,0 +1,29 @@
+plugins {
+    id 'application'
+}
+
+group = 'com.sparrowwallet'
+version = '1.0'
+
+repositories {
+    mavenCentral()
+}
+
+application {
+    mainClass = 'com.sparrowwallet.parrot.Main'
+}
+
+dependencies {
+    implementation('org.telegram:telegrambots-longpolling:8.0.0')
+    implementation('org.telegram:telegrambots-client:8.0.0')
+    implementation('org.slf4j:slf4j-api:2.0.12')
+    implementation ('ch.qos.logback:logback-classic:1.4.14') {
+        exclude group: 'org.slf4j'
+    }
+    testImplementation platform('org.junit:junit-bom:5.10.0')
+    testImplementation('org.junit.jupiter:junit-jupiter')
+}
+
+test {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Wed Jan 08 09:08:46 SAST 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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 POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | 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" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+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

parrot

@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+cd `dirname $0`
+args="$*"
+args="${args%"${args##*[![:space:]]}"}"
+
+if [ -n "$args" ]
+then
+  ./gradlew run --args="$args"
+else
+  ./gradlew run
+fi

settings.gradle

@@ -0,0 +1,2 @@
+rootProject.name = 'parrot'
+

src/main/java/com/sparrowwallet/parrot/Main.java

@@ -0,0 +1,39 @@
+package com.sparrowwallet.parrot;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.telegram.telegrambots.longpolling.TelegramBotsLongPollingApplication;
+
+public class Main {
+    private static final Logger log = LoggerFactory.getLogger(Main.class);
+
+    private static final Object lock = new Object();
+
+    public static void main(String[] args) {
+        String botToken = System.getenv("PARROT_BOT_TOKEN");
+        if(botToken == null) {
+            System.err.println("PARROT_BOT_TOKEN environment variable not set");
+            System.exit(1);
+        }
+
+        String groupId = System.getenv("PARROT_GROUP_ID");
+        if(groupId == null) {
+            System.err.println("PARROT_GROUP_ID environment variable not set");
+            System.exit(1);
+        }
+
+        try(TelegramBotsLongPollingApplication botsApplication = new TelegramBotsLongPollingApplication()) {
+            botsApplication.registerBot(botToken, new ParrotBot(botToken, groupId));
+        } catch(Exception e) {
+            log.error("Failed to register bot", e);
+        }
+
+        try {
+            synchronized(lock) {
+                lock.wait();
+            }
+        } catch(InterruptedException e) {
+            log.error("Interrupted while waiting for lock", e);
+        }
+    }
+}

src/main/java/com/sparrowwallet/parrot/NymGenerator.java

@@ -0,0 +1,75 @@
+package com.sparrowwallet.parrot;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.HexFormat;
+import java.util.List;
+
+public class NymGenerator {
+    private static final Logger log = LoggerFactory.getLogger(NymGenerator.class);
+
+    private static final String ENGLISH_ADJECTIVES_NAME = "/english-adjectives.txt";
+    private static final String ENGLISH_NOUNS_NAME = "/english-nouns.txt";
+
+    private static final List<String> ENGLISH_ADJECTIVES;
+    private static final List<String> ENGLISH_NOUNS;
+
+    static {
+        ENGLISH_ADJECTIVES = new ArrayList<>();
+        ENGLISH_NOUNS = new ArrayList<>();
+
+        loadWordList(ENGLISH_ADJECTIVES_NAME, ENGLISH_ADJECTIVES);
+        loadWordList(ENGLISH_NOUNS_NAME, ENGLISH_NOUNS);
+    }
+
+    private static void loadWordList(String resourceName, List<String> words) {
+        try(BufferedReader br = new BufferedReader(new InputStreamReader(NymGenerator.class.getResourceAsStream(resourceName), StandardCharsets.UTF_8))) {
+            String line;
+            while((line = br.readLine()) != null) {
+                words.add(line);
+            }
+        } catch(IOException e) {
+            log.error("Failed to load word list from " + resourceName, e);
+        }
+    }
+
+    public static String getNym(String userName) {
+        byte[] digestBytes = sha256Hash(userName);
+
+        HexFormat format = HexFormat.of();
+        String first = format.formatHex(digestBytes, 0, digestBytes.length / 2);
+        String second = format.formatHex(digestBytes, digestBytes.length / 2, digestBytes.length);
+
+        int adjectiveHash = first.hashCode();
+        String adjective = ENGLISH_ADJECTIVES.get(Math.abs(adjectiveHash) % ENGLISH_ADJECTIVES.size());
+
+        int nounHash = second.hashCode();
+        String noun = ENGLISH_NOUNS.get(Math.abs(nounHash) % ENGLISH_NOUNS.size());
+
+        return capitalize(adjective) + capitalize(noun);
+    }
+
+    private static byte[] sha256Hash(String userName) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            digest.update(userName.getBytes(StandardCharsets.UTF_8), 0, userName.length());
+            return digest.digest();
+        } catch(NoSuchAlgorithmException e) {
+            log.error("Failed to generate SHA-256 hash", e);
+        }
+
+        return new byte[0];
+    }
+
+    private static String capitalize(String s) {
+        return s.substring(0, 1).toUpperCase() + s.substring(1).replace("-", "");
+    }
+}

src/main/java/com/sparrowwallet/parrot/ParrotBot.java

@@ -0,0 +1,191 @@
+package com.sparrowwallet.parrot;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.telegram.telegrambots.client.okhttp.OkHttpTelegramClient;
+import org.telegram.telegrambots.longpolling.util.LongPollingSingleThreadUpdateConsumer;
+import org.telegram.telegrambots.meta.api.methods.groupadministration.GetChatAdministrators;
+import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
+import org.telegram.telegrambots.meta.api.methods.send.SendPhoto;
+import org.telegram.telegrambots.meta.api.methods.updatingmessages.DeleteMessages;
+import org.telegram.telegrambots.meta.api.objects.InputFile;
+import org.telegram.telegrambots.meta.api.objects.PhotoSize;
+import org.telegram.telegrambots.meta.api.objects.Update;
+import org.telegram.telegrambots.meta.api.objects.chatmember.ChatMember;
+import org.telegram.telegrambots.meta.api.objects.message.Message;
+import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
+import org.telegram.telegrambots.meta.generics.TelegramClient;
+
+import java.util.*;
+
+public class ParrotBot implements LongPollingSingleThreadUpdateConsumer {
+    private static final Logger log = LoggerFactory.getLogger(ParrotBot.class);
+
+    private final TelegramClient telegramClient;
+    private final String groupId;
+    private final RateLimiter rateLimiter;
+    private final Map<String, List<Integer>> sentMessages;
+    private final Set<String> bannedNyms;
+
+    public ParrotBot(String botToken, String groupId) {
+        this.telegramClient = new OkHttpTelegramClient(botToken);
+        this.groupId = groupId;
+        this.rateLimiter = new RateLimiter(5, 60 * 1000);
+        this.sentMessages = new HashMap<>();
+        this.bannedNyms = new HashSet<>();
+    }
+
+    @Override
+    public void consume(Update update) {
+        if(update.hasMessage() && update.getMessage().getChat().isUserChat()) {
+            String userName = update.getMessage().getFrom().getUserName();
+            if(!rateLimiter.tryAcquire(userName)) {
+                sendRateLimitedMessage(update);
+            } else if(update.getMessage().hasText()) {
+                if(update.getMessage().getText().startsWith("/ban ") && isGroupAdmin(update.getMessage().getFrom().getId())) {
+                    banNym(update.getMessage().getChatId(), update.getMessage().getText().substring(5));
+                } else if(update.getMessage().getText().startsWith("/unban ") && isGroupAdmin(update.getMessage().getFrom().getId())) {
+                    unbanNym(update.getMessage().getChatId(), update.getMessage().getText().substring(7));
+                } else {
+                    forwardText(update, userName);
+                }
+            } else if(update.getMessage().hasPhoto()) {
+                forwardPhoto(update, userName);
+            }
+        } else if(update.hasMessage() && update.getMessage().getChat().isGroupChat() &&
+                update.getMessage().getNewChatMembers() != null && !update.getMessage().getNewChatMembers().isEmpty()) {
+            sendWelcomeMessage();
+        }
+    }
+
+    private void forwardText(Update update, String userName) {
+        String nym = NymGenerator.getNym(userName);
+        if(bannedNyms.contains(nym)) {
+            sendBannedMessage(update.getMessage().getChatId());
+            return;
+        }
+
+        SendMessage sendMessage = new SendMessage(groupId, nym + ": " + update.getMessage().getText());
+
+        try {
+            Message sentMessage = telegramClient.execute(sendMessage);
+            sentMessages.computeIfAbsent(nym, _ -> new ArrayList<>()).add(sentMessage.getMessageId());
+        } catch(TelegramApiException e) {
+            log.error("Error forwarding message", e);
+        }
+    }
+
+    private void forwardPhoto(Update update, String userName) {
+        String nym = NymGenerator.getNym(userName);
+        if(bannedNyms.contains(nym)) {
+            sendBannedMessage(update.getMessage().getChatId());
+            return;
+        }
+
+        PhotoSize photoSize = update.getMessage().getPhoto().getFirst();
+        InputFile inputFile = new InputFile(photoSize.getFileId());
+        SendPhoto sendPhoto = new SendPhoto(groupId, inputFile);
+        sendPhoto.setCaption(nym + ": " + (update.getMessage().getCaption() == null ? "" : update.getMessage().getCaption()));
+
+        try {
+            Message sentMessage = telegramClient.execute(sendPhoto);
+            sentMessages.computeIfAbsent(nym, _ -> new ArrayList<>()).add(sentMessage.getMessageId());
+        } catch(TelegramApiException e) {
+            log.error("Error forwarding photo", e);
+        }
+    }
+
+    private void sendWelcomeMessage() {
+        String welcomeText = """
+                ⚠️WARNING: There are scammers impersonating admins in this chat ⚠️
+                
+                If you are a new user, you are STRONGLY RECOMMENDED to send messages anonymously via the @NewSparrowWalletUser bot.
+                Your messages will be forwarded here under a pseudonym.
+                
+                If you ignore this advice, expect to be contacted by several scammers impersonating admins. YOU HAVE BEEN WARNED.
+                """;
+
+        SendMessage welcomeMessage = new SendMessage(groupId, welcomeText);
+        try {
+            telegramClient.execute(welcomeMessage);
+        } catch(TelegramApiException e) {
+            log.error("Error sending welcome message", e);
+        }
+    }
+
+    private void sendRateLimitedMessage(Update update) {
+        SendMessage sendMessage = SendMessage.builder()
+                .chatId(update.getMessage().getChatId())
+                .text("Too many messages, please wait awhile...").build();
+
+        try {
+            telegramClient.execute(sendMessage);
+        } catch(TelegramApiException e) {
+            log.error("Error sending rate limit message", e);
+        }
+    }
+
+    private boolean isGroupAdmin(Long userId) {
+        try {
+            GetChatAdministrators getChatAdministrators = new GetChatAdministrators(groupId);
+            List<ChatMember> administrators = telegramClient.execute(getChatAdministrators);
+
+            for(ChatMember admin : administrators) {
+                if(admin.getUser().getId().equals(userId)) {
+                    return true;
+                }
+            }
+        } catch(TelegramApiException e) {
+            log.error("Error determining group administrators", e);
+        }
+
+        return false;
+    }
+
+    private void banNym(Long chatId, String nym) {
+        bannedNyms.add(nym);
+
+        List<Integer> sentMessageIds = sentMessages.get(nym);
+        if(sentMessageIds != null) {
+            try {
+                DeleteMessages deleteMessages = new DeleteMessages(groupId, sentMessageIds);
+                telegramClient.execute(deleteMessages);
+            } catch(TelegramApiException e) {
+                log.error("Error deleting banned nym messages", e);
+            }
+        }
+
+        SendMessage sendMessage = SendMessage.builder()
+                .chatId(chatId)
+                .text(nym + "has been banned, and all forwarded messages have been deleted").build();
+        try {
+            telegramClient.execute(sendMessage);
+        } catch(TelegramApiException e) {
+            log.error("Error sending ban confirmation message", e);
+        }
+    }
+
+    private void unbanNym(Long chatId, String nym) {
+        bannedNyms.remove(nym);
+
+        SendMessage sendMessage = SendMessage.builder()
+                .chatId(chatId)
+                .text(nym + "has been unbanned").build();
+        try {
+            telegramClient.execute(sendMessage);
+        } catch(TelegramApiException e) {
+            log.error("Error sending unban confirmation message", e);
+        }
+    }
+
+    private void sendBannedMessage(Long chatId) {
+        SendMessage sendMessage = SendMessage.builder()
+                .chatId(chatId)
+                .text("You have been banned from using this bot.").build();
+        try {
+            telegramClient.execute(sendMessage);
+        } catch(TelegramApiException e) {
+            log.error("Error sending ban confirmation message", e);
+        }
+    }
+}

src/main/java/com/sparrowwallet/parrot/RateLimiter.java

@@ -0,0 +1,49 @@
+package com.sparrowwallet.parrot;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class RateLimiter {
+    private final int maxTokens;
+    private final long refillIntervalMillis;
+    private final Map<String, AtomicInteger> tokensMap;
+    private final Map<String, Long> lastRefillTimestampMap;
+    private final ReentrantLock lock = new ReentrantLock();
+
+    public RateLimiter(int maxTokens, long refillIntervalMillis) {
+        this.maxTokens = maxTokens;
+        this.refillIntervalMillis = refillIntervalMillis;
+        this.tokensMap = new HashMap<>();
+        this.lastRefillTimestampMap = new HashMap<>();
+    }
+
+    public boolean tryAcquire(String username) {
+        AtomicInteger tokens = tokensMap.computeIfAbsent(username, _ -> new AtomicInteger(maxTokens));
+        this.refill(username, tokens);
+        if(tokens.get() > 0) {
+            tokens.decrementAndGet();
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    private void refill(String username, AtomicInteger tokens) {
+        this.lock.lock();
+
+        long lastRefillTimestamp = lastRefillTimestampMap.computeIfAbsent(username, _ -> System.currentTimeMillis());
+        try {
+            long now = System.currentTimeMillis();
+            long elapsed = now - lastRefillTimestamp;
+            if(elapsed > this.refillIntervalMillis) {
+                int tokensToAdd = (int)(elapsed / this.refillIntervalMillis);
+                tokens.set(Math.min(this.maxTokens, tokens.get() + tokensToAdd));
+                lastRefillTimestampMap.put(username, now);
+            }
+        } finally {
+            this.lock.unlock();
+        }
+    }
+}

src/test/java/com/sparrowwallet/parrot/NymGeneratorTest.java

@@ -0,0 +1,27 @@
+package com.sparrowwallet.parrot;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class NymGeneratorTest {
+    @Test
+    public void generateNym() {
+        String name = "Joe1234";
+        String nym = NymGenerator.getNym(name);
+        Assertions.assertEquals("WickedGolf", nym);
+    }
+
+    @Test
+    public void generateNym2() {
+        String name = "Alice5678";
+        String nym = NymGenerator.getNym(name);
+        Assertions.assertEquals("WebbedEditor", nym);
+    }
+
+    @Test
+    public void generateNym3() {
+        String name = "Charlie9";
+        String nym = NymGenerator.getNym(name);
+        Assertions.assertEquals("ElatedMood", nym);
+    }
+}