feat: adding in new contacts functionality and wrappers, sorting out multiple files to organize all the wrapper functions

libsession-util/libsession-util

@@ -1 +1 @@
-Subproject commit b47ce1b3be84cac7cf051ef851c3c3de58381b26
+Subproject commit 94b14f212a14fd846f1737cd6180fff4f06d42f5

libsession-util/src/androidTest/java/network/loki/messenger/libsession_util/InstrumentedTests.kt

@@ -32,6 +32,12 @@ class InstrumentedTests {
         assertEquals("network.loki.messenger.libsession_util.test", appContext.packageName)
     }
 
+    @Test
+    fun jni_contacts() {
+        val userProfile = UserProfile.newInstance(keyPair.secretKey)
+
+    }
+
     @Test
     fun jni_accessible() {
         val userProfile = UserProfile.newInstance(keyPair.secretKey)
@@ -173,8 +179,8 @@ class InstrumentedTests {
 
         assertEquals(3, userConfigMerge.seqNo)
 
-        assertEquals("Raz", newConf.getName())
+        assertEquals("Nibbler", newConf.getName())
-        assertEquals("Raz", userProfile.getName())
+        assertEquals("Nibbler", userProfile.getName())
 
         userProfile.free()
         newConf.free()

libsession-util/src/main/cpp/CMakeLists.txt

@@ -22,14 +22,18 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(STATIC_BUNDLE ON)
 add_subdirectory(../../../libsession-util libsession)
 
+set(SOURCES
+        user_profile.cpp
+        config_base.cpp
+        contacts.cpp
+        util.cpp)
+
 add_library( # Sets the name of the library.
         session_util
-
         # Sets the library as a shared library.
         SHARED
-
         # Provides a relative path to your source file(s).
-        session_util.cpp)
+        ${SOURCES})
 
 # Searches for a specified prebuilt library and stores the path as a
 # variable. Because CMake includes system libraries in the search path by

libsession-util/src/main/cpp/config_base.cpp

@@ -0,0 +1,80 @@
+#include "config_base.h"
+#include "util.h"
+
+extern "C" {
+JNIEXPORT jboolean JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_dirty(JNIEnv *env, jobject thiz) {
+    auto* configBase = ptrToConfigBase(env, thiz);
+    return configBase->is_dirty();
+}
+
+JNIEXPORT jboolean JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_needsPush(JNIEnv *env, jobject thiz) {
+    auto config = ptrToConfigBase(env, thiz);
+    return config->needs_push();
+}
+
+JNIEXPORT jboolean JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_needsDump(JNIEnv *env, jobject thiz) {
+    auto config = ptrToConfigBase(env, thiz);
+    return config->needs_dump();
+}
+
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_push(JNIEnv *env, jobject thiz) {
+    auto config = ptrToConfigBase(env, thiz);
+    auto pair = config->push();
+    session::ustring to_push_str = pair.first;
+    jbyteArray returnByteArray = util::bytes_from_ustring(env, to_push_str);
+    jlong seqNo = pair.second;
+    jclass returnObjectClass = env->FindClass("network/loki/messenger/libsession_util/util/ConfigWithSeqNo");
+    jmethodID methodId = env->GetMethodID(returnObjectClass, "<init>", "([BJ)V");
+    jobject returnObject = env->NewObject(returnObjectClass, methodId, returnByteArray, seqNo);
+    return returnObject;
+}
+
+JNIEXPORT jbyteArray JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_dump(JNIEnv *env, jobject thiz) {
+    auto config = ptrToConfigBase(env, thiz);
+    auto dumped = config->dump();
+    jbyteArray bytes = util::bytes_from_ustring(env, dumped);
+    return bytes;
+}
+
+JNIEXPORT jstring JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_encryptionDomain(JNIEnv *env,
+                                                                         jobject thiz) {
+    auto conf = ptrToConfigBase(env, thiz);
+    return env->NewStringUTF(conf->encryption_domain());
+}
+
+JNIEXPORT void JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_confirmPushed(JNIEnv *env, jobject thiz,
+                                                                      jlong seq_no) {
+    auto conf = ptrToConfigBase(env, thiz);
+    conf->confirm_pushed(seq_no);
+}
+
+JNIEXPORT jint JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_merge___3_3B(JNIEnv *env, jobject thiz,
+                                                                     jobjectArray to_merge) {
+    auto conf = ptrToConfigBase(env, thiz);
+    size_t number = env->GetArrayLength(to_merge);
+    std::vector<session::ustring> configs = {};
+    for (int i = 0; i < number; i++) {
+        auto jArr = (jbyteArray) env->GetObjectArrayElement(to_merge, i);
+        auto bytes = util::ustring_from_bytes(env, jArr);
+        configs.push_back(bytes);
+    }
+    return conf->merge(configs);
+}
+
+JNIEXPORT jint JNICALL
+Java_network_loki_messenger_libsession_1util_ConfigBase_merge___3B(JNIEnv *env, jobject thiz,
+                                                                   jbyteArray to_merge) {
+    auto conf = ptrToConfigBase(env, thiz);
+    std::vector<session::ustring> configs = {util::ustring_from_bytes(env, to_merge)};
+    return conf->merge(configs);
+}
+
+}

libsession-util/src/main/cpp/config_base.h

@@ -0,0 +1,14 @@
+#ifndef SESSION_ANDROID_CONFIG_BASE_H
+#define SESSION_ANDROID_CONFIG_BASE_H
+
+#include "session/config/base.hpp"
+#include <jni.h>
+#include <string>
+
+inline session::config::ConfigBase* ptrToConfigBase(JNIEnv *env, jobject obj) {
+    jclass baseClass = env->FindClass("network/loki/messenger/libsession_util/ConfigBase");
+    jfieldID pointerField = env->GetFieldID(baseClass, "pointer", "J");
+    return (session::config::ConfigBase*) env->GetLongField(obj, pointerField);
+}
+
+#endif

libsession-util/src/main/cpp/contacts.cpp

@@ -0,0 +1,39 @@
+#include "contacts.h"
+#include "util.h"
+
+extern "C"
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_Contacts_get(JNIEnv *env, jobject thiz,
+                                                          jstring session_id) {
+    auto contacts = ptrToContacts(env, thiz);
+    auto contact = contacts->get(env->GetStringUTFChars(session_id, nullptr));
+    if (!contact) return nullptr;
+    jobject j_contact = serialize_contact(env, contact.value());
+    return j_contact;
+}
+
+extern "C"
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_Contacts_getOrCreate(JNIEnv *env, jobject thiz,
+                                                                  jstring session_id) {
+    auto contacts = ptrToContacts(env, thiz);
+    auto contact = contacts->get_or_create(env->GetStringUTFChars(session_id, nullptr));
+    return serialize_contact(env, contact);
+}
+
+extern "C"
+JNIEXPORT void JNICALL
+Java_network_loki_messenger_libsession_1util_Contacts_set(JNIEnv *env, jobject thiz,
+                                                          jobject contact) {
+    auto contacts = ptrToContacts(env, thiz);
+    auto contact_info = deserialize_contact(env, contact);
+    contacts->set(contact_info);
+}
+
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_network_loki_messenger_libsession_1util_Contacts_erase(JNIEnv *env, jobject thiz,
+                                                            jstring session_id) {
+    auto contacts = ptrToContacts(env, thiz);
+    return contacts->erase(env->GetStringUTFChars(session_id, nullptr));
+}

libsession-util/src/main/cpp/contacts.h

@@ -0,0 +1,32 @@
+#ifndef SESSION_ANDROID_CONTACTS_H
+#define SESSION_ANDROID_CONTACTS_H
+
+#include <jni.h>
+#include "session/config/contacts.hpp"
+
+inline session::config::Contacts *ptrToContacts(JNIEnv *env, jobject obj) {
+    jclass contactsClass = env->FindClass("network/loki/messenger/libsession_util/Contacts");
+    jfieldID pointerField = env->GetFieldID(contactsClass, "pointer", "J");
+    return (session::config::Contacts *) env->GetLongField(obj, pointerField);
+}
+
+inline jobject serialize_contact(JNIEnv *env, session::config::contact_info info) {
+    jclass contactClass = env->FindClass("network/loki/messenger/libsession_util/util/Contact");
+    jmethodID constructor = env->GetMethodID(contactClass, "<init>",
+                                             "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ZZZLnetwork/loki/messenger/libsession_util/util/UserPic;)V");
+    // val id: String,
+    // val name: String,
+    // val nickname: String,
+    // val approved: Boolean,
+    // val approvedMe: Boolean,
+    // val blocked: Boolean,
+    // val profilePicture: UserPic
+    return nullptr;
+}
+
+inline session::config::contact_info deserialize_contact(JNIEnv *env, jobject info) {
+
+}
+
+
+#endif //SESSION_ANDROID_CONTACTS_H

libsession-util/src/main/cpp/session_util.cpp

@@ -1,217 +0,0 @@
-#include <jni.h>
-#include <string>
-#include <sodium/crypto_sign_ed25519.h>
-#include "session/config/user_profile.hpp"
-
-session::config::ConfigBase* ptrToConfigBase(JNIEnv *env, jobject obj) {
-    jclass baseClass = env->FindClass("network/loki/messenger/libsession_util/ConfigBase");
-    jfieldID pointerField = env->GetFieldID(baseClass, "pointer", "J");
-    return (session::config::ConfigBase*) env->GetLongField(obj, pointerField);
-}
-
-session::config::UserProfile* ptrToProfile(JNIEnv* env, jobject obj) {
-    jclass configClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
-    jfieldID pointerField = env->GetFieldID(configClass, "pointer", "J");
-    return (session::config::UserProfile*) env->GetLongField(obj, pointerField);
-}
-
-jbyteArray bytes_from_ustring(JNIEnv* env, session::ustring_view from_str) {
-    size_t length = from_str.length();
-    jsize jlength = (jsize)length;
-    jbyteArray new_array = env->NewByteArray(jlength);
-    env->SetByteArrayRegion(new_array, 0, jlength, (jbyte*)from_str.data());
-    return new_array;
-}
-
-session::ustring ustring_from_bytes(JNIEnv* env, jbyteArray byteArray) {
-    size_t len = env->GetArrayLength(byteArray);
-    jbyte* bytes = env->GetByteArrayElements(byteArray, nullptr);
-    session::ustring newSt((u_char*)bytes, len);
-    env->ReleaseByteArrayElements(byteArray, bytes, 0);
-    return newSt;
-}
-
-extern "C"
-JNIEXPORT jobject JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_00024Companion_newInstance___3B_3B(
-        JNIEnv *env, jobject thiz, jbyteArray ed25519_secret_key, jbyteArray initial_dump) {
-    auto secret_key = ustring_from_bytes(env, ed25519_secret_key);
-    auto initial = ustring_from_bytes(env, initial_dump);
-    auto* profile = new session::config::UserProfile(secret_key, std::optional(initial));
-
-    jclass userClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
-    jmethodID constructor = env->GetMethodID(userClass, "<init>", "(J)V");
-    jobject newConfig = env->NewObject(userClass, constructor, reinterpret_cast<jlong>(profile));
-
-    return newConfig;
-}
-
-extern "C" JNIEXPORT jobject JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_00024Companion_newInstance___3B(
-        JNIEnv* env,
-        jobject,
-        jbyteArray secretKey) {
-
-    auto* profile = new session::config::UserProfile(ustring_from_bytes(env, secretKey), std::nullopt);
-
-    jclass userClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
-    jmethodID constructor = env->GetMethodID(userClass, "<init>", "(J)V");
-    jobject newConfig = env->NewObject(userClass, constructor, reinterpret_cast<jlong>(profile));
-
-    return newConfig;
-}
-
-extern "C" JNIEXPORT void JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_setName(
-        JNIEnv* env,
-        jobject thiz,
-        jstring newName) {
-    auto profile = ptrToProfile(env, thiz);
-    profile->set_name(env->GetStringUTFChars(newName, nullptr));
-}
-
-extern "C"
-JNIEXPORT jstring JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_getName(JNIEnv *env, jobject thiz) {
-    auto profile = ptrToProfile(env, thiz);
-    auto name = profile->get_name();
-    if (name == std::nullopt) return nullptr;
-    jstring returnString = env->NewStringUTF(name->data());
-    return returnString;
-}
-
-extern "C"
-JNIEXPORT void JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_free(JNIEnv *env, jobject thiz) {
-    auto profile = ptrToProfile(env, thiz);
-    delete profile;
-}
-
-extern "C"
-JNIEXPORT jboolean JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_dirty(JNIEnv *env, jobject thiz) {
-    auto* configBase = ptrToConfigBase(env, thiz);
-    return configBase->is_dirty();
-}
-
-extern "C"
-JNIEXPORT jboolean JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_needsPush(JNIEnv *env, jobject thiz) {
-    auto config = ptrToConfigBase(env, thiz);
-    return config->needs_push();
-}
-
-extern "C"
-JNIEXPORT jboolean JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_needsDump(JNIEnv *env, jobject thiz) {
-    auto config = ptrToConfigBase(env, thiz);
-    return config->needs_dump();
-}
-
-extern "C"
-JNIEXPORT jobject JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_push(JNIEnv *env, jobject thiz) {
-    auto config = ptrToConfigBase(env, thiz);
-    auto pair = config->push();
-    session::ustring to_push_str = pair.first;
-    jbyteArray returnByteArray = bytes_from_ustring(env, to_push_str);
-    jlong seqNo = pair.second;
-    jclass returnObjectClass = env->FindClass("network/loki/messenger/libsession_util/util/ConfigWithSeqNo");
-    jmethodID methodId = env->GetMethodID(returnObjectClass, "<init>", "([BJ)V");
-    jobject returnObject = env->NewObject(returnObjectClass, methodId, returnByteArray, seqNo);
-    return returnObject;
-}
-
-extern "C"
-JNIEXPORT jobject JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_getPic(JNIEnv *env, jobject thiz) {
-    auto profile = ptrToProfile(env, thiz);
-    auto pic = profile->get_profile_pic();
-    if (pic == std::nullopt) return nullptr;
-    // return nullptr if either parameter is null as per profile class
-    jclass returnObjectClass = env->FindClass("network/loki/messenger/libsession_util/util/UserPic");
-    jmethodID constructor = env->GetMethodID(returnObjectClass, "<init>", "(Ljava/lang/String;[B)V");
-    jstring url = env->NewStringUTF(pic->url.data());
-    jbyteArray byteArray = bytes_from_ustring(env, pic->key);
-    jobject returnObject = env->NewObject(returnObjectClass, constructor, url, byteArray);
-    return returnObject;
-}
-extern "C"
-JNIEXPORT void JNICALL
-Java_network_loki_messenger_libsession_1util_UserProfile_setPic(JNIEnv *env, jobject thiz,
-                                                                jobject user_pic) {
-    auto profile = ptrToProfile(env, thiz);
-    jclass userPicClass = env->FindClass("network/loki/messenger/libsession_util/util/UserPic");
-    jfieldID picField = env->GetFieldID(userPicClass, "url", "Ljava/lang/String;");
-    jfieldID keyField = env->GetFieldID(userPicClass, "key", "[B");
-    auto pic = (jstring)env->GetObjectField(user_pic, picField);
-    auto key = (jbyteArray)env->GetObjectField(user_pic, keyField);
-
-    const char* pic_chars = env->GetStringUTFChars(pic, nullptr);
-    auto key_str = ustring_from_bytes(env, key);
-    auto* pic_string = new std::string(pic_chars);
-
-    profile->set_profile_pic(*pic_string, key_str);
-}
-extern "C"
-JNIEXPORT jbyteArray JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_dump(JNIEnv *env, jobject thiz) {
-    auto config = ptrToConfigBase(env, thiz);
-    auto dumped = config->dump();
-    jbyteArray bytes = bytes_from_ustring(env, dumped);
-    return bytes;
-}
-extern "C"
-JNIEXPORT jobject JNICALL
-Java_network_loki_messenger_libsession_1util_util_Sodium_ed25519KeyPair(JNIEnv *env, jobject thiz, jbyteArray seed) {
-    std::array<unsigned char, 32> ed_pk;
-    std::array<unsigned char, 64> ed_sk;
-    auto seed_bytes = ustring_from_bytes(env, seed);
-    crypto_sign_ed25519_seed_keypair(ed_pk.data(), ed_sk.data(), seed_bytes.data());
-
-    jclass kp_class = env->FindClass("network/loki/messenger/libsession_util/util/KeyPair");
-    jmethodID kp_constructor = env->GetMethodID(kp_class, "<init>", "([B[B)V");
-
-    jbyteArray pk_jarray = bytes_from_ustring(env, session::ustring_view {ed_pk.data(), ed_pk.size()});
-    jbyteArray sk_jarray = bytes_from_ustring(env, session::ustring_view {ed_sk.data(), ed_sk.size()});
-
-    jobject return_obj = env->NewObject(kp_class, kp_constructor, pk_jarray, sk_jarray);
-    return return_obj;
-}
-extern "C"
-JNIEXPORT jstring JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_encryptionDomain(JNIEnv *env,
-                                                                         jobject thiz) {
-    auto conf = ptrToConfigBase(env, thiz);
-    return env->NewStringUTF(conf->encryption_domain());
-}
-extern "C"
-JNIEXPORT void JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_confirmPushed(JNIEnv *env, jobject thiz,
-                                                                      jlong seq_no) {
-    auto conf = ptrToConfigBase(env, thiz);
-    conf->confirm_pushed(seq_no);
-}
-extern "C"
-JNIEXPORT jint JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_merge___3_3B(JNIEnv *env, jobject thiz,
-                                                              jobjectArray to_merge) {
-    auto conf = ptrToConfigBase(env, thiz);
-    size_t number = env->GetArrayLength(to_merge);
-    std::vector<session::ustring> configs = {};
-    for (int i = 0; i < number; i++) {
-        auto jArr = (jbyteArray) env->GetObjectArrayElement(to_merge, i);
-        auto bytes = ustring_from_bytes(env, jArr);
-        configs.push_back(bytes);
-    }
-    return conf->merge(configs);
-}
-
-extern "C"
-JNIEXPORT jint JNICALL
-Java_network_loki_messenger_libsession_1util_ConfigBase_merge___3B(JNIEnv *env, jobject thiz,
-                                                                   jbyteArray to_merge) {
-    auto conf = ptrToConfigBase(env, thiz);
-    std::vector<session::ustring> configs = {ustring_from_bytes(env, to_merge)};
-    return conf->merge(configs);
-}

libsession-util/src/main/cpp/user_profile.cpp

@@ -0,0 +1,78 @@
+#include "user_profile.h"
+#include "util.h"
+
+extern "C" {
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_00024Companion_newInstance___3B_3B(
+        JNIEnv *env, jobject thiz, jbyteArray ed25519_secret_key, jbyteArray initial_dump) {
+    auto secret_key = util::ustring_from_bytes(env, ed25519_secret_key);
+    auto initial = util::ustring_from_bytes(env, initial_dump);
+    auto* profile = new session::config::UserProfile(secret_key, std::optional(initial));
+
+    jclass userClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
+    jmethodID constructor = env->GetMethodID(userClass, "<init>", "(J)V");
+    jobject newConfig = env->NewObject(userClass, constructor, reinterpret_cast<jlong>(profile));
+
+    return newConfig;
+}
+
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_00024Companion_newInstance___3B(
+        JNIEnv* env,
+        jobject,
+        jbyteArray secretKey) {
+
+    auto* profile = new session::config::UserProfile(util::ustring_from_bytes(env, secretKey), std::nullopt);
+
+    jclass userClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
+    jmethodID constructor = env->GetMethodID(userClass, "<init>", "(J)V");
+    jobject newConfig = env->NewObject(userClass, constructor, reinterpret_cast<jlong>(profile));
+
+    return newConfig;
+}
+
+JNIEXPORT void JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_setName(
+        JNIEnv* env,
+        jobject thiz,
+        jstring newName) {
+    auto profile = ptrToProfile(env, thiz);
+    profile->set_name(env->GetStringUTFChars(newName, nullptr));
+}
+
+JNIEXPORT jstring JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_getName(JNIEnv *env, jobject thiz) {
+    auto profile = ptrToProfile(env, thiz);
+    auto name = profile->get_name();
+    if (name == std::nullopt) return nullptr;
+    jstring returnString = env->NewStringUTF(name->data());
+    return returnString;
+}
+
+JNIEXPORT void JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_free(JNIEnv *env, jobject thiz) {
+    auto profile = ptrToProfile(env, thiz);
+    delete profile;
+}
+
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_getPic(JNIEnv *env, jobject thiz) {
+    auto profile = ptrToProfile(env, thiz);
+    auto pic = profile->get_profile_pic();
+
+    jobject returnObject = util::serialize_user_pic(env, pic);
+
+    return returnObject;
+}
+
+JNIEXPORT void JNICALL
+Java_network_loki_messenger_libsession_1util_UserProfile_setPic(JNIEnv *env, jobject thiz,
+                                                                jobject user_pic) {
+    auto profile = ptrToProfile(env, thiz);
+    auto pic = util::deserialize_user_pic(env, user_pic);
+    auto url = env->GetStringUTFChars(pic.first, nullptr);
+    auto key = util::ustring_from_bytes(env, pic.second);
+    profile->set_profile_pic(url, key);
+}
+
+}

libsession-util/src/main/cpp/user_profile.h

@@ -0,0 +1,14 @@
+#ifndef SESSION_ANDROID_USER_PROFILE_H
+#define SESSION_ANDROID_USER_PROFILE_H
+
+#include "session/config/user_profile.hpp"
+#include <jni.h>
+#include <string>
+
+inline session::config::UserProfile* ptrToProfile(JNIEnv* env, jobject obj) {
+    jclass configClass = env->FindClass("network/loki/messenger/libsession_util/UserProfile");
+    jfieldID pointerField = env->GetFieldID(configClass, "pointer", "J");
+    return (session::config::UserProfile*) env->GetLongField(obj, pointerField);
+}
+
+#endif

libsession-util/src/main/cpp/util.cpp

@@ -0,0 +1,60 @@
+#include "util.h"
+#include <string>
+#include <sodium/crypto_sign.h>
+
+namespace util {
+    jbyteArray bytes_from_ustring(JNIEnv* env, session::ustring_view from_str) {
+        size_t length = from_str.length();
+        auto jlength = (jsize)length;
+        jbyteArray new_array = env->NewByteArray(jlength);
+        env->SetByteArrayRegion(new_array, 0, jlength, (jbyte*)from_str.data());
+        return new_array;
+    }
+
+    session::ustring ustring_from_bytes(JNIEnv* env, jbyteArray byteArray) {
+        size_t len = env->GetArrayLength(byteArray);
+        auto bytes = env->GetByteArrayElements(byteArray, nullptr);
+
+        session::ustring st{reinterpret_cast<const unsigned char *>(bytes), len};
+        env->ReleaseByteArrayElements(byteArray, bytes, 0);
+        return st;
+    }
+
+    jobject serialize_user_pic(JNIEnv *env, std::optional<session::config::profile_pic> pic) {
+        if (!pic) return nullptr;
+
+        jclass returnObjectClass = env->FindClass("network/loki/messenger/libsession_util/util/UserPic");
+        jmethodID constructor = env->GetMethodID(returnObjectClass, "<init>", "(Ljava/lang/String;[B)V");
+        jstring url = env->NewStringUTF(pic->url.data());
+        jbyteArray byteArray = util::bytes_from_ustring(env, pic->key);
+        return env->NewObject(returnObjectClass, constructor, url, byteArray);
+    }
+
+    std::pair<jstring, jbyteArray> deserialize_user_pic(JNIEnv *env, jobject user_pic) {
+        jclass userPicClass = env->FindClass("network/loki/messenger/libsession_util/util/UserPic");
+        jfieldID picField = env->GetFieldID(userPicClass, "url", "Ljava/lang/String;");
+        jfieldID keyField = env->GetFieldID(userPicClass, "key", "[B");
+        auto pic = (jstring)env->GetObjectField(user_pic, picField);
+        auto key = (jbyteArray)env->GetObjectField(user_pic, keyField);
+        return {pic, key};
+    }
+
+}
+
+extern "C"
+JNIEXPORT jobject JNICALL
+Java_network_loki_messenger_libsession_1util_util_Sodium_ed25519KeyPair(JNIEnv *env, jobject thiz, jbyteArray seed) {
+    std::array<unsigned char, 32> ed_pk;
+    std::array<unsigned char, 64> ed_sk;
+    auto seed_bytes = util::ustring_from_bytes(env, seed);
+    crypto_sign_ed25519_seed_keypair(ed_pk.data(), ed_sk.data(), seed_bytes.data());
+
+    jclass kp_class = env->FindClass("network/loki/messenger/libsession_util/util/KeyPair");
+    jmethodID kp_constructor = env->GetMethodID(kp_class, "<init>", "([B[B)V");
+
+    jbyteArray pk_jarray = util::bytes_from_ustring(env, session::ustring_view {ed_pk.data(), ed_pk.size()});
+    jbyteArray sk_jarray = util::bytes_from_ustring(env, session::ustring_view {ed_sk.data(), ed_sk.size()});
+
+    jobject return_obj = env->NewObject(kp_class, kp_constructor, pk_jarray, sk_jarray);
+    return return_obj;
+}

libsession-util/src/main/cpp/util.h

@@ -0,0 +1,17 @@
+#ifndef SESSION_ANDROID_UTIL_H
+#define SESSION_ANDROID_UTIL_H
+
+#include <jni.h>
+#include <array>
+#include <optional>
+#include "session/types.hpp"
+#include "session/config/profile_pic.hpp"
+
+namespace util {
+    jbyteArray bytes_from_ustring(JNIEnv* env, session::ustring_view from_str);
+    session::ustring ustring_from_bytes(JNIEnv* env, jbyteArray byteArray);
+    jobject serialize_user_pic(JNIEnv *env, std::optional<session::config::profile_pic> pic);
+    std::pair<jstring, jbyteArray> deserialize_user_pic(JNIEnv *env, jobject user_pic);
+}
+
+#endif

libsession-util/src/main/java/network/loki/messenger/libsession_util/Config.kt

@@ -1,6 +1,7 @@
 package network.loki.messenger.libsession_util
 
 import network.loki.messenger.libsession_util.util.ConfigWithSeqNo
+import network.loki.messenger.libsession_util.util.Contact
 import network.loki.messenger.libsession_util.util.UserPic
 
 
@@ -10,6 +11,7 @@ sealed class ConfigBase(protected val /* yucky */ pointer: Long) {
             System.loadLibrary("session_util")
         }
     }
+
     external fun dirty(): Boolean
     external fun needsPush(): Boolean
     external fun needsDump(): Boolean
@@ -18,18 +20,28 @@ sealed class ConfigBase(protected val /* yucky */ pointer: Long) {
     external fun encryptionDomain(): String
     external fun confirmPushed(seqNo: Long)
     external fun merge(toMerge: Array<ByteArray>): Int
+
     // Singular merge
     external fun merge(toMerge: ByteArray): Int
 }
 
+class Contacts(pointer: Long) : ConfigBase(pointer) {
+    external fun get(sessionId: String): Contact?
+    external fun getOrCreate(sessionId: String): Contact
+    external fun set(contact: Contact)
+    external fun erase(sessionId: String): Boolean
+}
+
 class UserProfile(pointer: Long) : ConfigBase(pointer) {
     companion object {
         init {
             System.loadLibrary("session_util")
         }
+
         external fun newInstance(ed25519SecretKey: ByteArray): UserProfile
         external fun newInstance(ed25519SecretKey: ByteArray, initialDump: ByteArray): UserProfile
     }
+
     external fun setName(newName: String)
     external fun getName(): String?
     external fun free()

libsession-util/src/main/java/network/loki/messenger/libsession_util/util/Contact.kt

@@ -0,0 +1,11 @@
+package network.loki.messenger.libsession_util.util
+
+data class Contact(
+    val id: String,
+    val name: String,
+    val nickname: String,
+    val approved: Boolean,
+    val approvedMe: Boolean,
+    val blocked: Boolean,
+    val profilePicture: UserPic
+)