Initial implementation

.gitattributes

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+messaging/src/androidTest/assets/image.jpg filter=lfs diff=lfs merge=lfs -text

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

README.md

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+# messaging-android
+This library provides an API to facilitate secure end-to-end encrypted messaging on Android devices,
+backed by a [fork of libsignal](https://github.com/getlantern/libsignal-protocol-java/) and
+communicating via a [tassis](https://github.com/getlantern/tassis) messaging server.
+
+messaging-android is currently used in [Lantern](https://lantern.io/) but is intended to be usable
+by other parties in their own clients. tassis will eventually support federation, such that 3rd
+parties can host their own back end and interoperate with other messaging clients.
+
+## Protocol Buffers
+messaging-android communicates with Tassis and internally stores data using protocol buffers.
+Messages exchanged with tassis are defined in [Messages.proto](messaging/src/main/protos/Messages.proto),
+which is just a copy of the protocol buffers defined in [tassis](https://github.com/getlantern/tassis/blob/main/model/Messages.proto).
+
+The messaging-android data model is defined in [Model.proto](messaging/src/main/protos/Model.proto).
+
+## Data Model
+messaging-android stores data in an [encrypted key-value store](https://github.com/getlantern/db-android/)
+using keys that follow the below convention.
+
+### /me (Model.Contact)
+The contact entry for the user themselves.
+
+### /contacts/d/[identityKey] (Model.Contact)
+A direct contact, identified by their public IdentityKey
+
+### /contacts/g/[groupId] (Model.Contact)
+A group contact, identified by its group id
+
+### /cba/[timestamp]/[d/[identityKey]|g/[groupId]]
+An index of Contacts by most recent activity. A given Contact will appear only once in this index.
+
+### /m/[senderIdentityKey]/[messageId] (Model.StoredMessage)
+The full content of all Messages are stored here, including both sent and received messages.
+The messageId is an id that's unique for messages sent from the given senderIdentityKey (in practice
+it's a type 4 UUID).
+
+### /cm/[d/[identityKey]|g/[groupId]]/[timestamp]/[senderIdentityKey]/[messageId]
+An index of all messages for a given Contact, by the sent timestamp of the message.
+
+### /dm/[disappearAt]/[senderIdentityKey]/[messageId]
+An index of all messages that are supposed to auto disappear by some time (in unix milliseconds)
+
+### /spam/[senderIdentityKey]/[timestamp]/[messageId] (Model.StoredMessage)
+Messages that aren't worth showing to the user for one reason or another.
+
+### /o/[timestamp]/[messageId] (Model.OutboundMessage)
+A queue of outbound messages that are pending send. If sending to some recipients fails, messages
+will be re-queued here for a limited period of time until they either send successfully or time
+runs out.
+
+### /ia/[senderIdentityKey]/[timestamp]/[messageId]/[attachmentId] (Model.InboundAttachment)
+A queue of inbound attachments that are pending download. If downloading fails, downloads will be
+re-queued here for a limited period of time until they either send successfully or time runs out.
+
+## Included Signal Code
+The included Signal code (like AttachmentCipherInputStream) comes from https://github.com/signalapp/Signal-Android, not from https://github.com/signalapp/libsignal-service-java
+
+## ktlint
+This project is formatted and linted with ktlint using the [ktlint-gradle plugin](https://github.com/JLLeitschuh/ktlint-gradle).
+
+You can install the [ktlint Intellij plugin](https://plugins.jetbrains.com/plugin/15057-ktlint-unofficial-)
+for some support for linting within Android Studio.
+
+### Add Commit Hook
+./gradlew addKtlintCheckGitPreCommitHook
+
+This adds a pre commit hook that lints all staged files upon commit.
+
+### Manually Auto-format
+./gradlew ktlintFormat
+
+This auto-formats all Kotlin files in the project.
+
+### Manually Check
+./gradlew ktlintCheck
+
+This manually runs the linter against all Kotlin files in the project.

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    ext.kotlin_version = "1.4.32"
+    ext.ktor_version = "1.5.2"
+
+    repositories {
+        google()
+        jcenter()
+        maven {
+            url "https://plugins.gradle.org/m2/"
+        }
+    }
+
+    dependencies {
+        classpath "com.android.tools.build:gradle:4.1.3"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath("org.jlleitschuh.gradle:ktlint-gradle:10.1.0")
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+        maven { url "https://www.jitpack.io" }
+    }
+
+    apply plugin: "org.jlleitschuh.gradle.ktlint"
+
+    ktlint {
+        android = true
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

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+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

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+#Wed Mar 10 20:46:29 CST 2021
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip

gradlew

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+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  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 "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+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, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$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" "$@"