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Java chaincode implementation of ERC-20 token standard. (#714)

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* Java erc20 chaincode implementation Signed-off-by: renjithpta <renjithkn@gmail.com>

Signed-off-by: renjithpta <renjithkn@gmail.com>

* Java erc20 chaincode implementation Signed-off-by: renjithpta <renjithkn@gmail.com>

Signed-off-by: renjithpta <renjithkn@gmail.com>

* Java erc20 chaincode implementation Signed-off-by: renjithpta <renjithkn@gmail.com>

Signed-off-by: renjithpta <renjithkn@gmail.com>

* Java erc20 token standard chaincode implementation Signed-off-by: renjithpta <renjithkn@gmail.com>

Signed-off-by: renjithpta <renjithkn@gmail.com>
This commit is contained in:
Renjith K N 2022-04-19 11:39:53 +00:00 committed by GitHub
parent 92c6916223
commit 2ac6902996
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token-erc-20/chaincode-java/Dockerfile Executable file
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# SPDX-License-Identifier: Apache-2.0
# the first stage
FROM gradle:jdk11 AS GRADLE_BUILD
# copy the build.gradle and src code to the container
COPY src/ src/
COPY build.gradle ./
# Build and package our code
RUN gradle --no-daemon build shadowJar -x checkstyleMain -x checkstyleTest
# the second stage of our build just needs the compiled files
FROM openjdk:11-jre
ARG CC_SERVER_PORT=9999
# Setup tini to work better handle signals
ENV TINI_VERSION v0.19.0
ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
RUN chmod +x /tini
RUN addgroup --system javauser && useradd -g javauser javauser
# copy only the artifacts we need from the first stage and discard the rest
COPY --chown=javauser:javauser --from=GRADLE_BUILD /home/gradle/build/libs/chaincode.jar /chaincode.jar
COPY --chown=javauser:javauser docker/docker-entrypoint.sh /docker-entrypoint.sh
RUN chmod +x /docker-entrypoint.sh
ENV PORT $CC_SERVER_PORT
EXPOSE $CC_SERVER_PORT
USER javauser
ENTRYPOINT [ "/tini", "--", "/docker-entrypoint.sh" ]

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token-erc-20/chaincode-java/build.gradle Executable file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
plugins {
id 'com.github.johnrengelman.shadow' version '5.1.0'
id 'application'
id 'checkstyle'
id 'jacoco'
}
group 'org.hyperledger.fabric.samples'
version '1.0-SNAPSHOT'
dependencies {
implementation 'org.hyperledger.fabric-chaincode-java:fabric-chaincode-shim:2.4.1'
implementation 'org.json:json:+'
implementation 'com.owlike:genson:1.5'
testImplementation 'org.hyperledger.fabric-chaincode-java:fabric-chaincode-shim:2.4.1'
testImplementation 'org.junit.jupiter:junit-jupiter:5.4.2'
testImplementation 'org.assertj:assertj-core:3.11.1'
testImplementation 'org.mockito:mockito-core:2.+'
testRuntimeOnly("net.bytebuddy:byte-buddy:1.10.6")
}
repositories {
mavenCentral()
maven {
url 'https://jitpack.io'
}
}
application {
mainClass = 'org.hyperledger.fabric.contract.ContractRouter'
}
checkstyle {
toolVersion '8.21'
configFile file("config/checkstyle/checkstyle.xml")
}
checkstyleMain {
source ='src/main/java'
}
checkstyleTest {
source ='src/test/java'
}
jacocoTestReport {
dependsOn test
}
jacocoTestCoverageVerification {
violationRules {
rule {
limit {
minimum = 0.8
}
}
}
finalizedBy jacocoTestReport
}
test {
useJUnitPlatform()
testLogging {
events "passed", "skipped", "failed"
}
}
mainClassName = 'org.hyperledger.fabric.contract.ContractRouter'
shadowJar {
baseName = 'chaincode'
version = null
classifier = null
manifest {
attributes 'Main-Class': 'org.hyperledger.fabric.contract.ContractRouter'
}
}
check.dependsOn jacocoTestCoverageVerification
installDist.dependsOn check

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token-erc-20/chaincode-java/config/checkstyle/checkstyle.xml Executable file
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<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
"https://checkstyle.org/dtds/configuration_1_3.dtd">
<!--
Checkstyle configuration that matches the Eclipse formatter
Checkstyle is very configurable. Be sure to read the documentation at
http://checkstyle.sourceforge.net (or in your downloaded distribution).
Most Checks are configurable, be sure to consult the documentation.
To completely disable a check, just comment it out or delete it from the file.
Finally, it is worth reading the documentation.
-->
<module name="Checker">
<!--
If you set the basedir property below, then all reported file
names will be relative to the specified directory. See
https://checkstyle.org/5.x/config.html#Checker
<property name="basedir" value="${basedir}"/>
-->
<property name="fileExtensions" value="java, properties, xml"/>
<module name="SuppressionFilter">
<property name="file" value="${config_loc}/suppressions.xml"/>
<property name="optional" value="false"/>
</module>
<!-- Excludes all 'module-info.java' files -->
<!-- See https://checkstyle.org/config_filefilters.html -->
<module name="BeforeExecutionExclusionFileFilter">
<property name="fileNamePattern" value="module\-info\.java$"/>
</module>
<!-- Checks that a package-info.java file exists for each package. -->
<!-- See http://checkstyle.sourceforge.net/config_javadoc.html#JavadocPackage -->
<!-- <module name="JavadocPackage"/> -->
<!-- Checks whether files end with a new line. -->
<!-- See http://checkstyle.sourceforge.net/config_misc.html#NewlineAtEndOfFile -->
<module name="NewlineAtEndOfFile"/>
<!-- Checks that property files contain the same keys. -->
<!-- See http://checkstyle.sourceforge.net/config_misc.html#Translation -->
<module name="Translation"/>
<!-- Checks for Size Violations. -->
<!-- See http://checkstyle.sourceforge.net/config_sizes.html -->
<module name="FileLength"/>
<!-- Checks for whitespace -->
<!-- See http://checkstyle.sourceforge.net/config_whitespace.html -->
<module name="FileTabCharacter"/>
<!-- Miscellaneous other checks. -->
<!-- See http://checkstyle.sourceforge.net/config_misc.html -->
<module name="RegexpSingleline">
<property name="format" value="\s+$"/>
<property name="minimum" value="0"/>
<property name="maximum" value="0"/>
<property name="message" value="Line has trailing spaces."/>
</module>
<!-- Checks for Headers -->
<!-- See http://checkstyle.sourceforge.net/config_header.html -->
<!-- <module name="Header"> -->
<!-- <property name="headerFile" value="${checkstyle.header.file}"/> -->
<!-- <property name="fileExtensions" value="java"/> -->
<!-- </module> -->
<module name="TreeWalker">
<!-- Checks for Javadoc comments. -->
<!-- See http://checkstyle.sourceforge.net/config_javadoc.html -->
<!-- <module name="JavadocMethod"/> -->
<!-- <module name="JavadocType"/> -->
<!-- <module name="JavadocVariable"/> -->
<!-- <module name="JavadocStyle"/> -->
<!-- <module name="MissingJavadocMethod"/> -->
<!-- Checks for Naming Conventions. -->
<!-- See http://checkstyle.sourceforge.net/config_naming.html -->
<module name="ConstantName"/>
<module name="LocalFinalVariableName"/>
<module name="LocalVariableName"/>
<module name="PackageName"/>
<module name="StaticVariableName"/>
<module name="TypeName"/>
<!-- Checks for imports -->
<!-- See http://checkstyle.sourceforge.net/config_import.html -->
<module name="AvoidStarImport"/>
<module name="IllegalImport"/> <!-- defaults to sun.* packages -->
<module name="RedundantImport"/>
<module name="UnusedImports">
<property name="processJavadoc" value="false"/>
</module>
<!-- Checks for Size Violations. -->
<!-- See http://checkstyle.sourceforge.net/config_sizes.html -->
<module name="MethodLength"/>
<module name="ParameterNumber"/>
<!-- Checks for whitespace -->
<!-- See http://checkstyle.sourceforge.net/config_whitespace.html -->
<module name="EmptyForIteratorPad"/>
<module name="GenericWhitespace"/>
<module name="MethodParamPad"/>
<module name="NoWhitespaceAfter"/>
<module name="NoWhitespaceBefore"/>
<module name="OperatorWrap"/>
<module name="ParenPad"/>
<module name="TypecastParenPad"/>
<module name="WhitespaceAfter"/>
<module name="WhitespaceAround"/>
<!-- Modifier Checks -->
<!-- See http://checkstyle.sourceforge.net/config_modifiers.html -->
<module name="ModifierOrder"/>
<module name="RedundantModifier"/>
<!-- Checks for blocks. You know, those {}'s -->
<!-- See http://checkstyle.sourceforge.net/config_blocks.html -->
<module name="AvoidNestedBlocks"/>
<module name="EmptyBlock"/>
<module name="LeftCurly"/>
<module name="NeedBraces"/>
<module name="RightCurly"/>
<!-- Checks for common coding problems -->
<!-- See http://checkstyle.sourceforge.net/config_coding.html -->
<module name="EmptyStatement"/>
<module name="EqualsHashCode"/>
<module name="HiddenField">
<property name="ignoreConstructorParameter" value="true"/>
</module>
<module name="IllegalInstantiation"/>
<module name="InnerAssignment"/>
<module name="MissingSwitchDefault"/>
<module name="MultipleVariableDeclarations"/>
<module name="SimplifyBooleanExpression"/>
<module name="SimplifyBooleanReturn"/>
<!-- Checks for class design -->
<!-- See http://checkstyle.sourceforge.net/config_design.html -->
<module name="DesignForExtension"/>
<module name="FinalClass"/>
<module name="HideUtilityClassConstructor"/>
<module name="InterfaceIsType"/>
<module name="VisibilityModifier">
<property name="allowPublicFinalFields" value="true"/>
</module>
<!-- Miscellaneous other checks. -->
<!-- See http://checkstyle.sourceforge.net/config_misc.html -->
<module name="ArrayTypeStyle"/>
<module name="FinalParameters"/>
<module name="TodoComment"/>
<module name="UpperEll"/>
</module>
</module>

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token-erc-20/chaincode-java/config/checkstyle/suppressions.xml Executable file
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<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
"https://checkstyle.org/dtds/suppressions_1_2.dtd">
<suppressions>
<suppress files="Transfer.java" checks="HiddenFiled" />
<suppress files="Approval.java" checks="HiddenFiled" />
</suppressions>

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token-erc-20/chaincode-java/docker/docker-entrypoint.sh Executable file
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#!/usr/bin/env bash
#
# SPDX-License-Identifier: Apache-2.0
#
set -euo pipefail
: ${CORE_PEER_TLS_ENABLED:="false"}
: ${DEBUG:="false"}
if [ "${DEBUG,,}" = "true" ]; then
exec java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=0.0.0.0:8000 -jar /chaincode.jar
elif [ "${CORE_PEER_TLS_ENABLED,,}" = "true" ]; then
exec java -jar /chaincode.jar # todo
else
exec java -jar /chaincode.jar
fi

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token-erc-20/chaincode-java/gradle/wrapper/gradle-wrapper.jar vendored Executable file
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token-erc-20/chaincode-java/gradle/wrapper/gradle-wrapper.properties vendored Executable file
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

188
token-erc-20/chaincode-java/gradlew vendored Executable file
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#!/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`="\"$arg\""
fi
i=$((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"
# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
cd "$(dirname "$0")"
fi
exec "$JAVACMD" "$@"

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token-erc-20/chaincode-java/gradlew.bat vendored Executable file
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@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 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 init
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 init
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
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
: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 %CMD_LINE_ARGS%
: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

5
token-erc-20/chaincode-java/settings.gradle Executable file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
rootProject.name = 'erc721'

28
token-erc-20/chaincode-java/src/main/java/org/hyperledger/fabric/samples/erc20/ContractConstants.java Normal file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20;
/** ERC20 constants for KEYS ,EVENTS and MSP */
public enum ContractConstants {
BALANCE_PREFIX("balance"),
ALLOWANCE_PREFIX("allowance"),
NAME_KEY("name"),
SYMBOL_KEY("decimals"),
DECIMALS_KEY("symbolKey"),
TOTAL_SUPPLY_KEY("totalSupply"),
TRANSFER_EVENT("Transfer"),
MINTER_ORG_MSPID("Org1MSP"),
APPROVAL("Approval");
private final String prefix;
ContractConstants(final String value) {
this.prefix = value;
}
public String getValue() {
return prefix;
}
}

19
token-erc-20/chaincode-java/src/main/java/org/hyperledger/fabric/samples/erc20/ContractErrors.java Normal file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20;
/**
* @author Renjith
* ERC20 constants for exceptions.
*/
public enum ContractErrors {
BALANCE_NOT_FOUND,
UNAUTHORIZED_SENDER,
INVALID_AMOUNT,
NOT_FOUND,
INVALID_TRANSFER,
INSUFFICIENT_FUND,
NO_ALLOWANCE_FOUND
}

469
token-erc-20/chaincode-java/src/main/java/org/hyperledger/fabric/samples/erc20/ERC20TokenContract.java Normal file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.ALLOWANCE_PREFIX;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.APPROVAL;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.BALANCE_PREFIX;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.DECIMALS_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.NAME_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.SYMBOL_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.TOTAL_SUPPLY_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.TRANSFER_EVENT;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.BALANCE_NOT_FOUND;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.INSUFFICIENT_FUND;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.INVALID_AMOUNT;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.INVALID_TRANSFER;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.NOT_FOUND;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.NO_ALLOWANCE_FOUND;
import static org.hyperledger.fabric.samples.erc20.ContractErrors.UNAUTHORIZED_SENDER;
import static org.hyperledger.fabric.samples.erc20.utils.ContractUtility.stringIsNullOrEmpty;
import com.owlike.genson.Genson;
import org.hyperledger.fabric.Logger;
import org.hyperledger.fabric.contract.Context;
import org.hyperledger.fabric.contract.ContractInterface;
import org.hyperledger.fabric.contract.annotation.Contact;
import org.hyperledger.fabric.contract.annotation.Contract;
import org.hyperledger.fabric.contract.annotation.Default;
import org.hyperledger.fabric.contract.annotation.Info;
import org.hyperledger.fabric.contract.annotation.License;
import org.hyperledger.fabric.contract.annotation.Transaction;
import org.hyperledger.fabric.samples.erc20.model.Approval;
import org.hyperledger.fabric.samples.erc20.model.Transfer;
import org.hyperledger.fabric.shim.ChaincodeException;
import org.hyperledger.fabric.shim.ChaincodeStub;
import org.hyperledger.fabric.shim.ledger.CompositeKey;
@Contract(
name = "erc20token",
info =
@Info(
title = "ERC20Token Contract",
description = "The erc20 fungible token implementation.",
version = "0.0.1-SNAPSHOT",
license =
@License(
name = "Apache 2.0 License",
url = "http://www.apache.org/licenses/LICENSE-2.0.html"),
contact =
@Contact(
email = "renjithkn@gmail.com",
name = "Renjith Narayanan",
url = "https://hyperledger.example.com")))
@Default
public final class ERC20TokenContract implements ContractInterface {
final Logger logger = Logger.getLogger(ERC20TokenContract.class);
/**
* Mint creates new tokens and adds them to minter's account balance. This function triggers a
* Transfer event.
*
* @param ctx the transaction context
* @param amount of tokens to be minted
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void Mint(final Context ctx, final long amount) {
// Check minter authorization - this sample assumes Org1 is the central banker with privilege to
// mint new tokens
String clientMSPID = ctx.getClientIdentity().getMSPID();
ChaincodeStub stub = ctx.getStub();
if (!clientMSPID.equalsIgnoreCase(ContractConstants.MINTER_ORG_MSPID.getValue())) {
throw new ChaincodeException(
"Client is not authorized to mint new tokens", UNAUTHORIZED_SENDER.toString());
}
// Get ID of submitting client identity
String minter = ctx.getClientIdentity().getId();
if (amount <= 0) {
throw new ChaincodeException(
"Mint amount must be a positive integer", INVALID_AMOUNT.toString());
}
CompositeKey balanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), minter);
String currentBalanceStr = stub.getStringState(balanceKey.toString());
// If minter current balance doesn't yet exist, we'll create it with a current balance of 0
long currentBalance = 0;
if (!stringIsNullOrEmpty(currentBalanceStr)) {
currentBalance = Long.parseLong(currentBalanceStr);
}
// Used safe math .
long updatedBalance = Math.addExact(currentBalance, amount);
stub.putStringState(balanceKey.toString(), String.valueOf(updatedBalance));
// Increase totalSupply
String totalSupplyStr = stub.getStringState(TOTAL_SUPPLY_KEY.getValue());
long totalSupply = 0;
if (!stringIsNullOrEmpty(totalSupplyStr)) {
totalSupply = Long.parseLong(totalSupplyStr);
}
// Used safe math .
totalSupply = Math.addExact(totalSupply, amount);
stub.putStringState(TOTAL_SUPPLY_KEY.getValue(), String.valueOf(totalSupply));
Transfer transferEvent = new Transfer("0x0", minter, amount);
stub.setEvent(TRANSFER_EVENT.getValue(), this.marshal(transferEvent));
logger.info(
String.format(
"minter account %s balance updated from %d to %d",
minter, currentBalance, updatedBalance));
}
/**
* Burn redeems tokens the minter's account balance. This function triggers a Transfer event.
*
* @param ctx the transaction context
* @param amount amount of tokens to be burned
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void Burn(final Context ctx, final long amount) {
// Check minter authorization - this sample assumes Org1 is the central banker with privilege to
// burn tokens
String clientMSPID = ctx.getClientIdentity().getMSPID();
ChaincodeStub stub = ctx.getStub();
if (!clientMSPID.equalsIgnoreCase(ContractConstants.MINTER_ORG_MSPID.getValue())) {
throw new ChaincodeException(
"Client is not authorized to burn tokens", UNAUTHORIZED_SENDER.toString());
}
String minter = ctx.getClientIdentity().getId();
if (amount <= 0) {
throw new ChaincodeException(
"Burn amount must be a positive integer", INVALID_AMOUNT.toString());
}
CompositeKey balanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), minter);
String currentBalanceStr = stub.getStringState(balanceKey.toString());
if (stringIsNullOrEmpty(currentBalanceStr)) {
throw new ChaincodeException("The balance does not exist", BALANCE_NOT_FOUND.toString());
}
long currentBalance = Long.parseLong(currentBalanceStr);
// Check if the sender has enough tokens to burn.
if (currentBalance < amount) {
String errorMessage = String.format("Client account %s has insufficient funds", minter);
throw new ChaincodeException(errorMessage, INSUFFICIENT_FUND.toString());
}
long updatedBalance = Math.subtractExact(currentBalance, amount);
stub.putStringState(balanceKey.toString(), String.valueOf(updatedBalance));
// Decrease totalSupply
String totalSupplyBytes = stub.getStringState(TOTAL_SUPPLY_KEY.getValue());
if (stringIsNullOrEmpty(totalSupplyBytes)) {
throw new ChaincodeException("TotalSupply does not exist", NOT_FOUND.toString());
}
long totalSupply = Math.subtractExact(Long.parseLong(totalSupplyBytes), amount);
stub.putStringState(TOTAL_SUPPLY_KEY.getValue(), String.valueOf(totalSupply));
// Emit the Transfer event
final Transfer transferEvent = new Transfer(minter, "0x0", amount);
stub.setEvent(TRANSFER_EVENT.getValue(), this.marshal(transferEvent));
logger.info(
String.format(
"minter account %s balance updated from %d to %d",
minter, currentBalance, updatedBalance));
}
/**
* Transfer transfers tokens from client account to recipient account. Recipient account must be a
* valid client Id as returned by the ClientID() function must be a valid clientID as returned by
* the ClientAccountID() function. This function triggers a Transfer event.
*
* @param ctx the transaction context
* @param to the recipient
* @param value the amount of token to be transferred
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void Transfer(final Context ctx, final String to, final long value) {
String from = ctx.getClientIdentity().getId();
this.transferHelper(ctx, from, to, value);
final Transfer transferEvent = new Transfer(from, to, value);
ctx.getStub().setEvent(TRANSFER_EVENT.getValue(), this.marshal(transferEvent));
}
/**
* BalanceOf returns the balance of the given account.
*
* @param ctx the transaction context
* @param owner the owner from which the balance will be retrieved
* @return the account balance
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public long BalanceOf(final Context ctx, final String owner) {
ChaincodeStub stub = ctx.getStub();
CompositeKey balanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), owner);
String balance = stub.getStringState(balanceKey.toString());
if (stringIsNullOrEmpty(balance)) {
String errorMessage = String.format("Balance of the owner %s not exists", owner);
throw new ChaincodeException(errorMessage, NOT_FOUND.toString());
}
logger.info(String.format("%s has balance of %s tokens", owner, balance));
return Long.parseLong(balance);
}
/**
* ClientAccountBalance returns the balance of the requesting client's account.
*
* @param ctx the transaction context
* @return client the account balance
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public long ClientAccountBalance(final Context ctx) {
// Get ID of submitting client identity
ChaincodeStub stub = ctx.getStub();
String clientAccountID = ctx.getClientIdentity().getId();
CompositeKey balanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), clientAccountID);
String balanceBytes = stub.getStringState(balanceKey.toString());
if (stringIsNullOrEmpty(balanceBytes)) {
String errorMessage = String.format("The account %s does not exist", clientAccountID);
throw new ChaincodeException(errorMessage, NOT_FOUND.toString());
}
long balance = Long.parseLong(balanceBytes);
logger.info(String.format("%s has balance of %d tokens", clientAccountID, balance));
return balance;
}
/**
* ClientAccountID returns the id of the requesting client's account. In this implementation, the
* client account ID is the clientId itself. Users can use this function to get their own account
* id, which they can then give to others as the payment address.
*
* @return client account id .
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public String ClientAccountID(final Context ctx) {
// Get ID of submitting client identity
return ctx.getClientIdentity().getId();
}
/**
* Return the total token supply.
*
* @param ctx the transaction context
* @return the total token supply
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public long TotalSupply(final Context ctx) {
String totalSupply = ctx.getStub().getStringState(TOTAL_SUPPLY_KEY.getValue());
if (stringIsNullOrEmpty(totalSupply)) {
throw new ChaincodeException("Total Supply not found", NOT_FOUND.toString());
}
logger.info(String.format("TotalSupply: %s tokens", totalSupply));
return Long.parseLong(totalSupply);
}
/**
* Allows `spender` to spend `value` amount of tokens from the owner.
*
* @param ctx the transaction context
* @param spender The spender
* @param value The amount of tokens to be approved for transfer
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void Approve(final Context ctx, final String spender, final long value) {
ChaincodeStub stub = ctx.getStub();
String owner = ctx.getClientIdentity().getId();
CompositeKey allowanceKey =
stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), owner, spender);
stub.putStringState(allowanceKey.toString(), String.valueOf(value));
Approval approval = new Approval(owner, spender, value);
stub.setEvent(APPROVAL.getValue(), this.marshal(approval));
logger.info(
String.format(
"client %s approved a withdrawal allowance of %d for spender %s",
owner, value, spender));
}
/**
* Returns the amount of tokens which `spender` is allowed to withdraw from `owner`.
*
* @param ctx the transaction context
* @param owner The owner of tokens
* @param spender The spender who are able to transfer the tokens
* @return the amount of remaining tokens allowed to spent
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public long Allowance(final Context ctx, final String owner, final String spender) {
ChaincodeStub stub = ctx.getStub();
CompositeKey allowanceKey =
stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), owner, spender);
String allowanceBytes = stub.getStringState(allowanceKey.toString());
long allowance = 0;
if (!stringIsNullOrEmpty(allowanceBytes)) {
allowance = Long.parseLong(allowanceBytes);
}
logger.info(
String.format(
"The allowance left for spender %s to withdraw from owner %s: %d",
spender, owner, allowance));
return allowance;
}
/**
* Transfer `value` amount of tokens from `from` to `to`.
*
* @param ctx the transaction context
* @param from The sender
* @param to The recipient
* @param value The amount of token to be transferred
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void TransferFrom(
final Context ctx, final String from, final String to, final long value) {
String spender = ctx.getClientIdentity().getId();
ChaincodeStub stub = ctx.getStub();
// Retrieve the allowance of the spender
CompositeKey allowanceKey = stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), from, spender);
String currentAllowanceStr = stub.getStringState(allowanceKey.toString());
if (stringIsNullOrEmpty(currentAllowanceStr)) {
String errorMessage = String.format("Spender %s has no allowance from %s", spender, from);
throw new ChaincodeException(errorMessage, NO_ALLOWANCE_FOUND.toString());
}
long currentAllowance = Long.parseLong(currentAllowanceStr);
// Check if the transferred value is less than the allowance
if (currentAllowance < value) {
String errorMessage =
String.format("Spender %s does not have enough allowance to spend", spender);
throw new ChaincodeException(errorMessage, INSUFFICIENT_FUND.toString());
}
this.transferHelper(ctx, from, to, value);
// Decrease the allowance
long updatedAllowance = currentAllowance - value;
stub.putStringState(allowanceKey.toString(), String.valueOf(updatedAllowance));
final Transfer transferEvent = new Transfer(from, to, value);
stub.setEvent(TRANSFER_EVENT.getValue(), marshal(transferEvent));
logger.info(
String.format(
"spender %s allowance updated from %d to %d",
spender, currentAllowance, updatedAllowance));
}
/**
* This is a helper function function that transfers tokens from the "from" address to the "to"
* address. Dependent functions include Transfer and TransferFrom
*
* @param ctx the transaction context
* @param from the sender
* @param to the receiver
* @param value the amount.
*/
private void transferHelper(
final Context ctx, final String from, final String to, final long value) {
if (from.equalsIgnoreCase(to)) {
throw new ChaincodeException(
"Cannot transfer to and from same client account", INVALID_TRANSFER.toString());
}
// transfer of 0 is allowed in ERC20, so just validate against negative amounts
if (value < 0) {
throw new ChaincodeException("Transfer amount cannot be negative", INVALID_AMOUNT.toString());
}
ChaincodeStub stub = ctx.getStub();
// Retrieve the current balance of the sender
CompositeKey fromBalanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), from);
String fromCurrentBalanceStr = stub.getStringState(fromBalanceKey.toString());
if (stringIsNullOrEmpty(fromCurrentBalanceStr)) {
String errorMessage = String.format("Client account %s has no balance", from);
throw new ChaincodeException(errorMessage, INSUFFICIENT_FUND.toString());
}
long fromCurrentBalance = Long.parseLong(fromCurrentBalanceStr);
// Check if the sender has enough tokens to spend.
if (fromCurrentBalance < value) {
String errorMessage = String.format("Client account %s has insufficient funds", from);
throw new ChaincodeException(errorMessage, INSUFFICIENT_FUND.toString());
}
// Retrieve the current balance of the recipient
CompositeKey toBalanceKey = stub.createCompositeKey(BALANCE_PREFIX.getValue(), to);
String toCurrentBalanceStr = stub.getStringState(toBalanceKey.toString());
long toCurrentBalance = 0;
// If recipient current balance doesn't yet exist, we'll create it with a
// current balance of 0
if (!stringIsNullOrEmpty(toCurrentBalanceStr)) {
toCurrentBalance = Long.parseLong(toCurrentBalanceStr.trim());
}
// Update the balance
long fromUpdatedBalance = Math.subtractExact(fromCurrentBalance, value);
long toUpdatedBalance = Math.addExact(toCurrentBalance, value);
stub.putStringState(fromBalanceKey.toString(), String.valueOf(fromUpdatedBalance));
stub.putStringState(toBalanceKey.toString(), String.valueOf(toUpdatedBalance));
logger.info(
String.format(
"client %s balance updated from %d to %d",
from, fromCurrentBalance, fromUpdatedBalance));
logger.info(
String.format(
"recipient %s balance updated from %d to %d", to, toCurrentBalance, toUpdatedBalance));
}
/**
* Set optional information for a token.
*
* @param ctx the transaction context
* @param name The name of the token
* @param symbol The symbol of the token
* @param decimals The decimals of the token
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void SetOptions(
final Context ctx, final String name, final String symbol, final String decimals) {
ChaincodeStub stub = ctx.getStub();
stub.putStringState(NAME_KEY.getValue(), name);
stub.putStringState(SYMBOL_KEY.getValue(), symbol);
stub.putStringState(DECIMALS_KEY.getValue(), decimals);
}
/**
* Return the name of the token - e.g. "MyToken". The original function name is `name` in ERC20
* specification. However, 'name' conflicts with a parameter `name` in `Contract` class. As a work
* around, we use `TokenName` as an alternative function name.
*
* @param ctx the transaction context
* @return the name of the token
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public String TokenName(final Context ctx) {
String tokenName = ctx.getStub().getStringState(ContractConstants.NAME_KEY.getValue());
if (stringIsNullOrEmpty(tokenName)) {
throw new ChaincodeException("Token name not found", NOT_FOUND.toString());
}
return tokenName;
}
/**
* Return the symbol of the token.
*
* @param ctx the transaction context
* @return the symbol of the token
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public String TokenSymbol(final Context ctx) {
String tokenSymbol = ctx.getStub().getStringState(SYMBOL_KEY.getValue());
if (stringIsNullOrEmpty(tokenSymbol)) {
throw new ChaincodeException("Token symbol not found", NOT_FOUND.toString());
}
return tokenSymbol;
}
/**
* Return the number of decimals the token uses e.g. 8, means to divide the token amount by
* 100000000 to get its user representation.
*
* @param ctx the transaction context
* @return the number of decimals
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public int Decimals(final Context ctx) {
String decimals = ctx.getStub().getStringState(DECIMALS_KEY.getValue());
if (stringIsNullOrEmpty(decimals)) {
throw new ChaincodeException("Decimal not found", NOT_FOUND.toString());
}
return Integer.parseInt(decimals);
}
/**
* marshal the event data
*
* @param obj the object to marshal.
* @return marshalled object.
*/
private byte[] marshal(final Object obj) {
return new Genson().serialize(obj).getBytes(UTF_8);
}
}

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token-erc-20/chaincode-java/src/main/java/org/hyperledger/fabric/samples/erc20/model/Approval.java Normal file
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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20.model;
import com.owlike.genson.annotation.JsonProperty;
import org.hyperledger.fabric.contract.annotation.DataType;
import org.hyperledger.fabric.contract.annotation.Property;
@DataType()
public final class Approval {
@Property()
@JsonProperty("owner")
private String owner;
@Property()
@JsonProperty("spender")
private String spender;
@Property()
@JsonProperty("value")
private long value;
/** Default constructor */
public Approval() {
super();
}
/**
* Constructor of the class
*
* @param owner token owner
* @param spender approved spender of the token
* @param value amount approved as allowance
*/
public Approval(
@JsonProperty("owner") final String owner,
@JsonProperty("spender") final String spender,
@JsonProperty("value") final long value) {
super();
this.owner = owner;
this.spender = spender;
this.value = value;
}
public String getOwner() {
return owner;
}
public String getSpender() {
return spender;
}
public long getValue() {
return value;
}
}

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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20.model;
import com.owlike.genson.annotation.JsonProperty;
import org.hyperledger.fabric.contract.annotation.DataType;
import org.hyperledger.fabric.contract.annotation.Property;
@DataType()
public final class Transfer {
@Property()
@JsonProperty("from")
private String from;
@Property()
@JsonProperty("to")
private String to;
@Property()
@JsonProperty("value")
private long value;
/** Default constructor */
public Transfer() {
super();
}
/**
* Constructor of the class
*
* @param from owner of the token
* @param to token receiver
* @param value amount to be transferred
*/
public Transfer(
@JsonProperty("from") final String from,
@JsonProperty("to") final String to,
@JsonProperty("value") final long value) {
super();
this.from = from;
this.to = to;
this.value = value;
}
public String getFrom() {
return from;
}
public String getTo() {
return to;
}
public long getValue() {
return value;
}
}

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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20.utils;
/**
* @author Renjith
* @Desc Utility class
*/
public final class ContractUtility {
private ContractUtility() {
}
public static boolean stringIsNullOrEmpty(final String string) {
return string == null || string.isEmpty();
}
}

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/*
* SPDX-License-Identifier: Apache-2.0
*/
package org.hyperledger.fabric.samples.erc20;
import org.hyperledger.fabric.contract.ClientIdentity;
import org.hyperledger.fabric.contract.Context;
import org.hyperledger.fabric.shim.ChaincodeException;
import org.hyperledger.fabric.shim.ChaincodeStub;
import org.hyperledger.fabric.shim.ledger.CompositeKey;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.catchThrowable;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.ALLOWANCE_PREFIX;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.BALANCE_PREFIX;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.DECIMALS_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.MINTER_ORG_MSPID;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.NAME_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.SYMBOL_KEY;
import static org.hyperledger.fabric.samples.erc20.ContractConstants.TOTAL_SUPPLY_KEY;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
public class TokenERC20ContractTest {
private final String org1UserId =
"x509::CN=User0@org1.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
private final String spender =
"x509::CN=User1@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
@Nested
class InvokeQueryERC20TokenOptionsTransaction {
@Test
public void whenTokenNameExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(NAME_KEY.getValue())).thenReturn("ARBTToken");
String tokenName = contract.TokenName(ctx);
assertThat(tokenName).isEqualTo("ARBTToken");
}
@Test
public void whenTokenNameDoesNotExist() {
ERC20TokenContract contract = new ERC20TokenContract();
final Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(NAME_KEY.getValue())).thenReturn("");
Throwable thrown = catchThrowable(() -> contract.TokenName(ctx));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Token name not found");
}
@Test
public void whenTokenSymbolExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(SYMBOL_KEY.getValue())).thenReturn("ARBT");
String toknName = contract.TokenSymbol(ctx);
assertThat(toknName).isEqualTo("ARBT");
}
@Test
public void whenTokenSymbolDoesNotExist() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(SYMBOL_KEY.getValue())).thenReturn("");
Throwable thrown = catchThrowable(() -> contract.TokenSymbol(ctx));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Token symbol not found");
}
@Test
public void whenTokenDecimalExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(DECIMALS_KEY.getValue())).thenReturn("18");
long decimal = contract.Decimals(ctx);
assertThat(decimal).isEqualTo(18);
}
@Test
public void whenTokenDecimalNotExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(DECIMALS_KEY.getValue())).thenReturn("");
Throwable thrown = catchThrowable(() -> contract.Decimals(ctx));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Decimal not found");
}
@Test
public void whenTokenTotalSupplyExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(TOTAL_SUPPLY_KEY.getValue())).thenReturn("222222222222");
long totalSupply = contract.TotalSupply(ctx);
assertThat(totalSupply).isEqualTo(222222222222L);
}
@Test
public void whenTokenTotalSupplyNotExists() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(TOTAL_SUPPLY_KEY.getValue())).thenReturn("");
Throwable thrown = catchThrowable(() -> contract.TotalSupply(ctx));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Total Supply not found");
}
@Test
public void ClientAccountIDTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
assertThat(ci.getMSPID()).isEqualTo(MINTER_ORG_MSPID.getValue());
String id = contract.ClientAccountID(ctx);
assertThat(id).isEqualTo(org1UserId);
}
}
@Nested
class TokenOperationsInvoke {
@Test
public void invokeSetOptionsTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
contract.SetOptions(ctx, "ARBTToken", "ARBT", "18");
verify(stub).putStringState(NAME_KEY.getValue(), "ARBTToken");
verify(stub).putStringState(SYMBOL_KEY.getValue(), "ARBT");
verify(stub).putStringState(DECIMALS_KEY.getValue(), "18");
}
@Test
public void invokeBalanceOfTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn("1000");
long balance = contract.BalanceOf(ctx, org1UserId);
assertThat(balance).isEqualTo(1000);
}
@Test
public void invokeClientAccountBalanceTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
when(ctx.getStub()).thenReturn(stub);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn("1000");
long balance = contract.ClientAccountBalance(ctx);
assertThat(balance).isEqualTo(1000);
}
@Test
public void invokeMintTokenTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn(null);
when(ctx.getStub()).thenReturn(stub);
contract.Mint(ctx, 1000);
verify(stub).putStringState(TOTAL_SUPPLY_KEY.getValue(), "1000");
verify(stub).putStringState(ck.toString(), "1000");
}
@Test
public void whenMintTokenUnAuthorized() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn("Org2MSP");
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn(null);
when(ctx.getStub()).thenReturn(stub);
Throwable thrown = catchThrowable(() -> contract.Mint(ctx, 1000));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Client is not authorized to mint new tokens");
}
@Test
public void invokeTokenTransferTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
String to =
"x509::CN=User2@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
contract.Transfer(ctx, to, 100);
verify(stub).putStringState(ckTo.toString(), "100");
verify(stub).putStringState(ckFrom.toString(), "900");
}
@Test
public void whenZeroAmountTokenTransferTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
String to =
"x509::CN=User2@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
contract.Transfer(ctx, to, 0);
verify(stub).putStringState(ckTo.toString(), "0");
verify(stub).putStringState(ckFrom.toString(), "1000");
}
@Test
public void whenTokenTransferNegativeAmount() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
String to =
"x509::CN=User2@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
Throwable thrown = catchThrowable(() -> contract.Transfer(ctx, to, -1));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Transfer amount cannot be negative");
}
@Test
public void whenTokenTransferSameId() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
String to =
"x509::CN=User2@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
Throwable thrown = catchThrowable(() -> contract.Transfer(ctx, org1UserId, 10));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Cannot transfer to and from same client account");
}
@Test
public void invokeTokenBurnTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn(null);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(TOTAL_SUPPLY_KEY.getValue())).thenReturn("1000");
when(stub.getStringState(ck.toString())).thenReturn("1000");
contract.Burn(ctx, 100);
verify(stub).putStringState(TOTAL_SUPPLY_KEY.getValue(), "900");
}
@Test
public void whenTokenBurnUnAuthorizedTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn("Org2MSP");
when(ci.getId()).thenReturn(spender);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), spender)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + spender);
when(stub.getStringState(ck.toString())).thenReturn(null);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(TOTAL_SUPPLY_KEY.getValue())).thenReturn("1000");
when(stub.getStringState(ck.toString())).thenReturn("1000");
Throwable thrown = catchThrowable(() -> contract.Burn(ctx, 100));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Client is not authorized to burn tokens");
}
@Test
public void whenTokenBurnNegativeAmountTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn("Org1MSP");
when(ci.getId()).thenReturn(org1UserId);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ck);
when(ck.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ck.toString())).thenReturn(null);
when(ctx.getStub()).thenReturn(stub);
when(stub.getStringState(TOTAL_SUPPLY_KEY.getValue())).thenReturn("1000");
when(stub.getStringState(ck.toString())).thenReturn("1000");
Throwable thrown = catchThrowable(() -> contract.Burn(ctx, -100));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Burn amount must be a positive integer");
}
}
@Nested
class InvokeERC20AllowanceTransactions {
@Test
public void invokeAllowanceTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), org1UserId, spender))
.thenReturn(ck);
when(ck.toString()).thenReturn(ALLOWANCE_PREFIX.getValue() + org1UserId + spender);
when(stub.getStringState(ck.toString())).thenReturn("100");
long allowance = contract.Allowance(ctx, org1UserId, spender);
assertThat(allowance).isEqualTo(100);
}
@Test
public void invokeApproveForTokenAllowanceTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn(MINTER_ORG_MSPID.getValue());
when(ci.getId()).thenReturn(org1UserId);
when(ctx.getStub()).thenReturn(stub);
CompositeKey ck = mock(CompositeKey.class);
when(stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), org1UserId, spender))
.thenReturn(ck);
when(ck.toString()).thenReturn(ALLOWANCE_PREFIX.getValue() + org1UserId + spender);
contract.Approve(ctx, spender, 200);
verify(stub).putStringState(ck.toString(), String.valueOf(200));
}
@Test
public void invokeAllowanceTransferFromTest() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci;
String to =
"x509::CN=User3@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFromBalance = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.toString(), org1UserId))
.thenReturn(ckFromBalance);
when(ckFromBalance.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
CompositeKey ckTOBalance = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.toString(), to)).thenReturn(ckTOBalance);
when(ckFromBalance.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(ctx.getStub()).thenReturn(stub);
ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn("Org2MSP");
when(ci.getId()).thenReturn(spender);
CompositeKey ckAllowance = mock(CompositeKey.class);
when(stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), org1UserId, spender))
.thenReturn(ckAllowance);
when(ckAllowance.toString()).thenReturn(ALLOWANCE_PREFIX.getValue() + org1UserId + spender);
when(stub.getStringState(ckAllowance.toString())).thenReturn("200");
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
contract.TransferFrom(ctx, org1UserId, to, 100);
verify(stub).putStringState(ckTo.toString(), String.valueOf(100));
verify(stub).putStringState(ckFrom.toString(), String.valueOf(900));
}
@Test
public void whenClientSameAllowanceTransferFrom() {
ERC20TokenContract contract = new ERC20TokenContract();
Context ctx = mock(Context.class);
ChaincodeStub stub = mock(ChaincodeStub.class);
ClientIdentity ci;
String to =
"x509::CN=User3@org2.example.com, L=San Francisco, ST=California,"
+ " C=US::CN=ca.org2.example.com, O=org2.example.com, L=San Francisco, ST=California, C=US";
CompositeKey ckFromBalance = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId))
.thenReturn(ckFromBalance);
when(ckFromBalance.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
CompositeKey ckTOBalance = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTOBalance);
when(ckFromBalance.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(ctx.getStub()).thenReturn(stub);
ci = mock(ClientIdentity.class);
when(ctx.getClientIdentity()).thenReturn(ci);
when(ci.getMSPID()).thenReturn("Org2MSP");
when(ci.getId()).thenReturn(spender);
CompositeKey ckAllowance = mock(CompositeKey.class);
when(stub.createCompositeKey(ALLOWANCE_PREFIX.getValue(), org1UserId, spender))
.thenReturn(ckAllowance);
when(ckAllowance.toString()).thenReturn(ALLOWANCE_PREFIX.getValue() + org1UserId + spender);
when(stub.getStringState(ckAllowance.toString())).thenReturn("200");
CompositeKey ckFrom = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), org1UserId)).thenReturn(ckFrom);
when(ckFrom.toString()).thenReturn(BALANCE_PREFIX.getValue() + org1UserId);
when(stub.getStringState(ckFrom.toString())).thenReturn("1000");
CompositeKey ckTo = mock(CompositeKey.class);
when(stub.createCompositeKey(BALANCE_PREFIX.getValue(), to)).thenReturn(ckTo);
when(ckTo.toString()).thenReturn(BALANCE_PREFIX.getValue() + to);
when(stub.getStringState(ckTo.toString())).thenReturn(null);
Throwable thrown =
catchThrowable(() -> contract.TransferFrom(ctx, org1UserId, org1UserId, 100));
assertThat(thrown)
.isInstanceOf(ChaincodeException.class)
.hasNoCause()
.hasMessage("Cannot transfer to and from same client account");
}
}
}

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