Initial commit

.gitignore

@@ -0,0 +1,33 @@
+# SPDX-FileCopyrightText: 2021 Paul Schaub <info@pgpainless.org>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+.idea
+.gradle
+
+out/
+build/
+bin/
+libs/
+
+*/build
+
+*.iws
+*.iml
+*.ipr
+*.class
+*.log
+*.jar
+
+gradle.properties
+!gradle-wrapper.jar
+
+.classpath
+.project
+.settings/
+
+pgpainless-core/.classpath
+pgpainless-core/.project
+pgpainless-core/.settings/
+
+push_html.sh

build.gradle

@@ -0,0 +1,258 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <info@pgpainless.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+buildscript {
+
+    repositories {
+
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+        mavenLocal()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "gradle.plugin.org.kt3k.gradle.plugin:coveralls-gradle-plugin:2.12.0"
+    }
+}
+
+plugins {
+    id 'ru.vyarus.animalsniffer' version '1.5.3'
+}
+
+apply from: 'version.gradle'
+
+allprojects {
+    apply plugin: 'java'
+    apply plugin: 'idea'
+    apply plugin: 'eclipse'
+    apply plugin: 'jacoco'
+    apply plugin: 'checkstyle'
+
+    // For non-cli modules enable android api compatibility check
+    if (it.name.equals('vks-java')) {
+        // animalsniffer
+        apply plugin: 'ru.vyarus.animalsniffer'
+        dependencies {
+            signature "net.sf.androidscents.signature:android-api-level-${minAndroidSdk}:2.3.3_r2@signature"
+        }
+        animalsniffer {
+            sourceSets = [sourceSets.main]
+        }
+    }
+
+    // Only generate jar for submodules
+    // https://stackoverflow.com/a/25445035
+    jar {
+        onlyIf { !sourceSets.main.allSource.files.isEmpty() }
+    }
+
+    // checkstyle
+    checkstyle {
+        toolVersion = '8.18'
+    }
+
+    group 'org.pgpainless'
+    description = "Verifying Key Server Client API for Java"
+    version = shortVersion
+
+    sourceCompatibility = javaSourceCompatibility
+
+    repositories {
+        mavenCentral()
+    }
+
+    // Reproducible Builds
+    tasks.withType(AbstractArchiveTask) {
+        preserveFileTimestamps = false
+        reproducibleFileOrder = true
+    }
+
+    project.ext {
+        junitVersion = '5.8.2'
+        slf4jVersion = '1.7.32'
+        logbackVersion = '1.2.10'
+        pgpainlessVersion = '1.1.1'
+        rootConfigDir = new File(rootDir, 'config')
+        gitCommit = getGitCommit()
+        isContinuousIntegrationEnvironment = Boolean.parseBoolean(System.getenv('CI'))
+        isReleaseVersion = !isSnapshot
+        signingRequired = !(isSnapshot || isContinuousIntegrationEnvironment)
+        sonatypeCredentialsAvailable = project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePassword')
+        sonatypeSnapshotUrl = 'https://oss.sonatype.org/content/repositories/snapshots'
+        sonatypeStagingUrl = 'https://oss.sonatype.org/service/local/staging/deploy/maven2'
+    }
+
+    if (isSnapshot) {
+        version = version + '-SNAPSHOT'
+    }
+    def projectDirFile = new File("$projectDir")
+    if (!project.ext.isSnapshot && !'git describe --exact-match HEAD'.execute(null, projectDirFile).text.trim().equals(ext.shortVersion)) {
+        throw new InvalidUserDataException('Untagged version detected! Please tag every release.')
+    }
+    if (!version.endsWith('-SNAPSHOT') && version != 'git tag --points-at HEAD'.execute(null, projectDirFile).text.trim()) {
+        throw new InvalidUserDataException(
+                'Tag mismatch detected, version is ' + version + ' but should be ' +
+                        'git tag --points-at HEAD'.execute(null, projectDirFile).text.trim())
+    }
+
+    jacoco {
+        toolVersion = "0.8.7"
+    }
+
+    jacocoTestReport {
+        dependsOn test
+        sourceDirectories.setFrom(project.files(sourceSets.main.allSource.srcDirs))
+        classDirectories.setFrom(project.files(sourceSets.main.output))
+        reports {
+            xml.enabled true
+        }
+    }
+
+    test {
+        useJUnitPlatform()
+        testLogging {
+            events "passed", "skipped", "failed"
+            exceptionFormat "full"
+        }
+    }
+}
+
+subprojects {
+    apply plugin: 'maven-publish'
+    apply plugin: 'signing'
+
+    task sourcesJar(type: Jar, dependsOn: classes) {
+        classifier = 'sources'
+        from sourceSets.main.allSource
+    }
+    task javadocJar(type: Jar, dependsOn: javadoc) {
+        classifier = 'javadoc'
+        from javadoc.destinationDir
+    }
+    task testsJar(type: Jar, dependsOn: testClasses) {
+        classifier = 'tests'
+        from sourceSets.test.output
+    }
+
+    publishing {
+        publications {
+            mavenJava(MavenPublication) {
+                from components.java
+                artifact sourcesJar
+                artifact javadocJar
+                artifact testsJar
+                pom {
+                    name = 'VKS for Java'
+                    description = 'Verifying Key Server Client API for Java'
+                    url = 'https://github.com/pgpainless/vks-java'
+                    inceptionYear = '2022'
+
+                    scm {
+                        url = 'https://github.com/pgpainless/vks-java'
+                        connection = 'scm:https://github.com/pgpainless/vks-java'
+                        developerConnection = 'scm:git://github.com/pgpainless/vks-java.git'
+                    }
+
+                    licenses {
+                        license {
+                            name = 'The Apache Software License, Version 2.0'
+                            url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+                            distribution = 'repo'
+                        }
+                    }
+
+                    developers {
+                        developer {
+                            id = 'vanitasvitae'
+                            name = 'Paul Schaub'
+                            email = 'vanitasvitae@fsfe.org'
+                        }
+                    }
+                }
+            }
+        }
+        repositories {
+            if (sonatypeCredentialsAvailable) {
+                maven {
+                    url isSnapshot ? sonatypeSnapshotUrl : sonatypeStagingUrl
+                    credentials {
+                        username = sonatypeUsername
+                        password = sonatypePassword
+                    }
+                }
+            }
+        }
+    }
+
+    signing {
+        useGpgCmd()
+        required { signingRequired }
+        sign publishing.publications.mavenJava
+    }
+}
+
+def getGitCommit() {
+    def projectDirFile = new File("$projectDir")
+    def dotGit = new File("$projectDir/.git")
+    if (!dotGit.isDirectory()) return 'non-git build'
+
+    def cmd = 'git describe --always --tags --dirty=+'
+    def proc = cmd.execute(null, projectDirFile)
+    def gitCommit = proc.text.trim()
+    assert !gitCommit.isEmpty()
+
+    def srCmd = 'git symbolic-ref --short HEAD'
+    def srProc = srCmd.execute(null, projectDirFile)
+    srProc.waitForOrKill(10 * 1000)
+    if (srProc.exitValue() == 0) {
+        // Only add the information if the git command was
+        // successful. There may be no symbolic reference for HEAD if
+        // e.g. in detached mode.
+        def symbolicReference = srProc.text.trim()
+        assert !symbolicReference.isEmpty()
+        gitCommit += "-$symbolicReference"
+    }
+
+    gitCommit
+}
+
+apply plugin: "com.github.kt3k.coveralls"
+coveralls {
+	sourceDirs = files(subprojects.sourceSets.main.allSource.srcDirs).files.absolutePath
+}
+
+task jacocoRootReport(type: JacocoReport) {
+    dependsOn = subprojects.jacocoTestReport
+    sourceDirectories.setFrom(files(subprojects.sourceSets.main.allSource.srcDirs))
+    classDirectories.setFrom(files(subprojects.sourceSets.main.output))
+    executionData.setFrom(files(subprojects.jacocoTestReport.executionData))
+    reports {
+        xml.enabled true
+        xml.destination file("${buildDir}/reports/jacoco/test/jacocoTestReport.xml")
+    }
+    // We could remove the following setOnlyIf line, but then
+    // jacocoRootReport would silently be SKIPPED if something with
+    // the projectsWithUnitTests is wrong (e.g. a project is missing
+    // in there).
+    setOnlyIf { true }
+}
+
+task javadocAll(type: Javadoc) {
+    def currentJavaVersion = JavaVersion.current()
+    if (currentJavaVersion.compareTo(JavaVersion.VERSION_1_9) >= 0) {
+        options.addStringOption("-release", "8");
+    }
+    source subprojects.collect {project ->
+        project.sourceSets.main.allJava }
+    destinationDir = new File(buildDir, 'javadoc')
+    // Might need a classpath
+    classpath = files(subprojects.collect {project ->
+        project.sourceSets.main.compileClasspath})
+    options.linkSource = true
+    options.use = true
+    options.links = [
+            "https://docs.oracle.com/javase/${sourceCompatibility.getMajorVersion()}/docs/api/",
+    ] as String[]
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

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

settings.gradle

@@ -0,0 +1,3 @@
+rootProject.name = 'VKS-Java'
+
+include 'vks-java'

version.gradle

@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: 2021 Paul Schaub <info@pgpainless.org>
+//
+// SPDX-License-Identifier: CC0-1.0
+
+allprojects {
+    ext {
+        shortVersion = '0.1.0'
+        isSnapshot = true
+        minAndroidSdk = 10
+        javaSourceCompatibility = 1.8
+    }
+}

vks-java/build.gradle

@@ -0,0 +1,31 @@
+plugins {
+    id 'java-library'
+}
+
+group 'org.pgpainless'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
+
+    api("org.pgpainless:pgp-certificate-store:0.1.0")
+    api("org.pgpainless:pgpainless-core:1.1.4")
+
+    // @Nonnull, @Nullable...
+    implementation "com.google.code.findbugs:jsr305:3.0.2"
+
+    // Lombok
+    compileOnly 'org.projectlombok:lombok:1.18.22'
+    annotationProcessor 'org.projectlombok:lombok:1.18.22'
+
+    testCompileOnly 'org.projectlombok:lombok:1.18.22'
+    testAnnotationProcessor 'org.projectlombok:lombok:1.18.22'
+}
+
+test {
+    useJUnitPlatform()
+}

vks-java/src/main/java/pgp/vks/client/Get.java

@@ -0,0 +1,16 @@
+package pgp.vks.client;
+
+import pgp.vks.client.exception.CertNotFoundException;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public interface Get {
+
+    InputStream byFingerprint(String fingerprint) throws CertNotFoundException, IOException;
+
+    InputStream byKeyId(long keyId) throws CertNotFoundException;
+
+    InputStream byEmail(String email) throws CertNotFoundException;
+
+}

vks-java/src/main/java/pgp/vks/client/RequestVerify.java

@@ -0,0 +1,4 @@
+package pgp.vks.client;
+
+public interface RequestVerify {
+}

vks-java/src/main/java/pgp/vks/client/Upload.java

@@ -0,0 +1,11 @@
+package pgp.vks.client;
+
+import pgp.certificate_store.Certificate;
+import pgp.vks.client.response.UploadResponse;
+
+import javax.annotation.Nonnull;
+
+public interface Upload {
+
+    UploadResponse cert(@Nonnull Certificate certificate);
+}

vks-java/src/main/java/pgp/vks/client/VKS.java

@@ -0,0 +1,28 @@
+package pgp.vks.client;
+
+import javax.annotation.Nonnull;
+
+public interface VKS {
+
+    enum Version {
+        v1
+    }
+
+    default Get get() {
+        return get(Version.v1);
+    }
+
+    Get get(@Nonnull Version version);
+
+    default Upload upload() {
+        return upload(Version.v1);
+    }
+
+    Upload upload(@Nonnull Version version);
+
+    default RequestVerify requestVerify() {
+        return requestVerify(Version.v1);
+    }
+
+    RequestVerify requestVerify(Version version);
+}

vks-java/src/main/java/pgp/vks/client/exception/CertNotFoundException.java

@@ -0,0 +1,12 @@
+package pgp.vks.client.exception;
+
+public class CertNotFoundException extends Exception {
+
+    public CertNotFoundException(Throwable cause) {
+        super(cause);
+    }
+
+    public CertNotFoundException() {
+
+    }
+}

vks-java/src/main/java/pgp/vks/client/impl/VKSImpl.java

@@ -0,0 +1,58 @@
+package pgp.vks.client.impl;
+
+import lombok.SneakyThrows;
+import pgp.vks.client.Get;
+import pgp.vks.client.RequestVerify;
+import pgp.vks.client.Upload;
+import pgp.vks.client.VKS;
+import pgp.vks.client.impl.v1.GetImpl;
+import pgp.vks.client.impl.v1.RequestVerifyImpl;
+import pgp.vks.client.impl.v1.UploadImpl;
+import pgp.vks.client.impl.v1.V1API;
+
+import javax.annotation.Nonnull;
+import java.net.URL;
+
+public class VKSImpl implements VKS {
+
+    private final V1API api;
+
+    public VKSImpl(URL vksService) {
+        this.api = new V1API(vksService);
+    }
+
+    @SneakyThrows
+    public static VKS keysDotOpenPgpDotOrg() {
+        return new VKSImpl(new URL("https://keys.openpgp.org"));
+    }
+
+    @Override
+    public Get get(@Nonnull Version version) {
+        switch (version) {
+            case v1:
+                return new GetImpl(api);
+            default:
+                throw new IllegalArgumentException("Invalid version: " + version);
+        }
+    }
+
+    @Override
+    public Upload upload(@Nonnull Version version) {
+        switch (version) {
+            case v1:
+                return new UploadImpl();
+            default:
+                throw new IllegalArgumentException("Invalid version: " + version);
+        }
+    }
+
+    @Override
+    public RequestVerify requestVerify(Version version) {
+        switch (version) {
+            case v1:
+                return new RequestVerifyImpl();
+            default:
+                throw new IllegalArgumentException("Invalid version: " + version);
+        }
+    }
+}

vks-java/src/main/java/pgp/vks/client/impl/v1/GetImpl.java

@@ -0,0 +1,44 @@
+package pgp.vks.client.impl.v1;
+
+import pgp.vks.client.Get;
+import pgp.vks.client.exception.CertNotFoundException;
+
+import javax.net.ssl.HttpsURLConnection;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+public class GetImpl implements Get {
+
+    private final V1API api;
+
+    public GetImpl(V1API api) {
+        this.api = api;
+    }
+
+    @Override
+    public InputStream byFingerprint(String fingerprint) throws CertNotFoundException, IOException {
+        URL url = api.getByFingerprint(fingerprint);
+        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+        connection.setRequestMethod("GET");
+
+        int status = connection.getResponseCode();
+        if (status == 200) {
+            return connection.getInputStream();
+        } else if (status == 404) {
+            throw new CertNotFoundException();
+        } else {
+            throw new IllegalStateException("Unhandled status code: " + status);
+        }
+    }
+
+    @Override
+    public InputStream byKeyId(long keyId) throws CertNotFoundException {
+        return null;
+    }
+
+    @Override
+    public InputStream byEmail(String email) throws CertNotFoundException {
+        return null;
+    }
+}

vks-java/src/main/java/pgp/vks/client/impl/v1/RequestVerifyImpl.java

@@ -0,0 +1,6 @@
+package pgp.vks.client.impl.v1;
+
+import pgp.vks.client.RequestVerify;
+
+public class RequestVerifyImpl implements RequestVerify {
+}

vks-java/src/main/java/pgp/vks/client/impl/v1/UploadImpl.java

@@ -0,0 +1,14 @@
+package pgp.vks.client.impl.v1;
+
+import pgp.certificate_store.Certificate;
+import pgp.vks.client.Upload;
+import pgp.vks.client.response.UploadResponse;
+
+import javax.annotation.Nonnull;
+
+public class UploadImpl implements Upload {
+    @Override
+    public UploadResponse cert(@Nonnull Certificate certificate) {
+        return null;
+    }
+}

vks-java/src/main/java/pgp/vks/client/impl/v1/V1API.java

@@ -0,0 +1,57 @@
+package pgp.vks.client.impl.v1;
+
+import lombok.SneakyThrows;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URL;
+import java.net.URLEncoder;
+
+/**
+ * URL mapper for the VKS API.
+ *
+ * @see <a href="https://keys.openpgp.org/about/api">VKS API Documentatioon</a>
+ */
+public class V1API {
+
+    private static final String GET_BY_FINGERPRINT = "/vks/v1/by-fingerprint/";
+    private static final String GET_BY_KEYID = "/vks/v1/by-keyid/";
+    private static final String GET_BY_EMAIL = "/vks/v1/by-email/";
+    private static final String POST_UPLOAD = "/vks/v1/upload";
+    private static final String POST_REQUEST_VERIFY = "/vks/v1/request-verify";
+
+    private final URL serviceUrl;
+
+    public V1API(URL serviceUrl) {
+        this.serviceUrl = serviceUrl;
+    }
+
+    public URL getByFingerprint(String fingerprint) {
+        return getUrl(GET_BY_FINGERPRINT, fingerprint.toUpperCase());
+    }
+
+    public URL getByKeyid(long keyId) {
+        return getUrl(GET_BY_KEYID, Long.toHexString(keyId).toUpperCase());
+    }
+
+    public URL getByEmail(String email) {
+        try {
+            return getUrl(GET_BY_EMAIL, URLEncoder.encode(email, "UTF-8"));
+        } catch (UnsupportedEncodingException e) {
+            // UTF8 is supported anywhere
+            throw new AssertionError(e);
+        }
+    }
+
+    public URL postUpload() {
+        return getUrl(POST_UPLOAD, null);
+    }
+
+    public URL postRequestVerify() {
+        return getUrl(POST_REQUEST_VERIFY, null);
+    }
+
+    @SneakyThrows
+    private URL getUrl(String path, String param) {
+        return new URL(serviceUrl.getProtocol(), serviceUrl.getHost(), serviceUrl.getPort(), serviceUrl.getPath() + path + (param != null ? param : ""), null);
+    }
+}

vks-java/src/main/java/pgp/vks/client/request/RequestVerifyRequest.java

@@ -0,0 +1,17 @@
+package pgp.vks.client.request;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+
+public class RequestVerifyRequest {
+
+    private final String token;
+    private final List<String> addresses;
+    private final List<String> locale;
+
+    public RequestVerifyRequest(@Nonnull String token, @Nonnull List<String> addresses, @Nonnull List<String> locale) {
+        this.token = token;
+        this.addresses = addresses;
+        this.locale = locale;
+    }
+}

vks-java/src/main/java/pgp/vks/client/request/UploadRequest.java

@@ -0,0 +1,12 @@
+package pgp.vks.client.request;
+
+import javax.annotation.Nonnull;
+
+public class UploadRequest {
+
+    private final String keytext;
+
+    public UploadRequest(@Nonnull String keytext) {
+        this.keytext = keytext;
+    }
+}

vks-java/src/main/java/pgp/vks/client/response/ErrorResponse.java

@@ -0,0 +1,16 @@
+package pgp.vks.client.response;
+
+import javax.annotation.Nonnull;
+
+public class ErrorResponse {
+
+    private final String error;
+
+    public ErrorResponse(@Nonnull String error) {
+        this.error = error;
+    }
+
+    public String getError() {
+        return error;
+    }
+}

vks-java/src/main/java/pgp/vks/client/response/RequestVerifyResponse.java

@@ -0,0 +1,17 @@
+package pgp.vks.client.response;
+
+import javax.annotation.Nonnull;
+import java.util.Map;
+
+public class RequestVerifyResponse {
+
+    private final String key_fpr;
+    private final Map<String, Status> status;
+    private final String token;
+
+    public RequestVerifyResponse(@Nonnull String key_fpr, @Nonnull Map<String, Status> status, @Nonnull String token) {
+        this.key_fpr = key_fpr;
+        this.status = status;
+        this.token = token;
+    }
+}

vks-java/src/main/java/pgp/vks/client/response/Status.java

@@ -0,0 +1,8 @@
+package pgp.vks.client.response;
+
+enum Status {
+    unpublished,
+    published,
+    revoked,
+    pending
+}

vks-java/src/main/java/pgp/vks/client/response/UploadResponse.java

@@ -0,0 +1,17 @@
+package pgp.vks.client.response;
+
+import java.util.Map;
+
+public class UploadResponse {
+
+    private final String key_fpr;
+    private final Map<String, Status> status;
+    private final String token;
+
+    public UploadResponse(String key_fpr, Map<String, Status> status, String token) {
+        this.key_fpr = key_fpr;
+        this.status = status;
+        this.token = token;
+    }
+
+}

vks-java/src/test/java/pgp/vks/client/impl/v1/V1APITest.java

@@ -0,0 +1,57 @@
+package pgp.vks.client.impl.v1;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class V1APITest {
+
+    private static V1API api;
+
+    @BeforeAll
+    static void prepare() throws MalformedURLException {
+        api = new V1API(new URL("https://keys.openpgp.org"));
+    }
+
+    @Test
+    void testGetByFingerprint() {
+        String fingerprint = "7F9116FEA90A5983936C7CFAA027DB2F3E1E118A";
+        URL url = api.getByFingerprint(fingerprint);
+
+        assertEquals("https://keys.openpgp.org/vks/v1/by-fingerprint/7F9116FEA90A5983936C7CFAA027DB2F3E1E118A", url.toString());
+    }
+
+    @Test
+    public void testGetByKeyId() {
+        long keyId = -6906310507597262454L;
+        URL url = api.getByKeyid(keyId);
+
+        assertEquals("https://keys.openpgp.org/vks/v1/by-keyid/A027DB2F3E1E118A", url.toString());
+    }
+
+    @Test
+    public void testGetByEmail() {
+        String email = "vanitasvitae@fsfe.org";
+        URL url = api.getByEmail(email);
+
+        assertEquals("https://keys.openpgp.org/vks/v1/by-email/vanitasvitae%40fsfe.org", url.toString());
+    }
+
+    @Test
+    public void testPostUpload() {
+        URL url = api.postUpload();
+
+        assertEquals("https://keys.openpgp.org/vks/v1/upload", url.toString());
+    }
+
+    @Test
+    public void testPostRequestVerify() {
+        URL url = api.postRequestVerify();
+
+        assertEquals("https://keys.openpgp.org/vks/v1/request-verify", url.toString());
+    }
+}

vks-java/src/test/java/pgp/vks/client/impl/v1/VKSTest.java

@@ -0,0 +1,36 @@
+package pgp.vks.client.impl.v1;
+
+import lombok.SneakyThrows;
+import org.bouncycastle.util.io.Streams;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import pgp.vks.client.VKS;
+import pgp.vks.client.exception.CertNotFoundException;
+import pgp.vks.client.impl.VKSImpl;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class VKSTest {
+
+    private static VKS vks;
+
+    @BeforeAll
+    static void prepare() {
+        vks = VKSImpl.keysDotOpenPgpDotOrg();
+    }
+
+    @Test
+    public void testGetByFingerprint() throws CertNotFoundException, IOException {
+        InputStream inputStream = vks.get().byFingerprint("7F9116FEA90A5983936C7CFAA027DB2F3E1E118A");
+        Streams.pipeAll(inputStream, System.out);
+    }
+
+    @Test
+    public void testGetByFingerprint_inexistent() {
+        assertThrows(CertNotFoundException.class, () ->
+                vks.get().byFingerprint("0000000000000000000000000000000000000000"));
+    }
+}

vks-java/src/test/java/pgp/vks/client/impl/v1/dummy_vks/DummyVks.java

@@ -0,0 +1,4 @@
+package pgp.vks.client.impl.v1.dummy_vks;
+
+public class DummyVks {
+}