add post creating business case

business_cases/post_creating/client/build.gradle

@@ -0,0 +1,74 @@
+buildscript {
+    repositories {
+        mavenLocal()
+        jcenter()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
+        classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:$gradle_bintray_plugin_version"
+    }
+}
+
+plugins {
+    id "org.jetbrains.kotlin.multiplatform" version "$kotlin_version"
+    id "org.jetbrains.kotlin.plugin.serialization" version "$kotlin_version"
+}
+
+project.version = "$core_version"
+project.group = "com.insanusmokrassar"
+
+repositories {
+    mavenLocal()
+    jcenter()
+    mavenCentral()
+    maven { url "https://kotlin.bintray.com/kotlinx" }
+}
+
+kotlin {
+    jvm()
+    js (BOTH) {
+        browser()
+        nodejs()
+    }
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation kotlin('stdlib')
+
+                api projectByName("business_cases.post_creating.common")
+                api projectByName("core.ktor.client")
+            }
+        }
+        commonTest {
+            dependencies {
+                implementation kotlin('test-common')
+                implementation kotlin('test-annotations-common')
+            }
+        }
+        jvmMain {
+            dependencies {
+                implementation kotlin('stdlib-jdk8')
+            }
+        }
+        jvmTest {
+            dependencies {
+                implementation kotlin('test-junit')
+            }
+        }
+        jsMain {
+            dependencies {
+                implementation kotlin('stdlib-js')
+            }
+        }
+        jsTest {
+            dependencies {
+                implementation kotlin('test-js')
+                implementation kotlin('test-junit')
+            }
+        }
+    }
+}

business_cases/post_creating/client/src/commonMain/kotlin/com/insanusmokrassar/postssystem/business_cases/post_creating/client/PostCreatingClientCase.kt

@@ -0,0 +1,23 @@
+package com.insanusmokrassar.postssystem.business_cases.post_creating.client
+
+import com.insanusmokrassar.postssystem.business_cases.post_creating.server.*
+import com.insanusmokrassar.postssystem.core.content.Content
+import com.insanusmokrassar.postssystem.core.post.RegisteredPost
+import com.insanusmokrassar.postssystem.core.publishing.TriggerId
+import com.insanusmokrassar.postssystem.ktor.buildStandardUrl
+import com.insanusmokrassar.postssystem.ktor.client.BodyPair
+import com.insanusmokrassar.postssystem.ktor.client.unipost
+import io.ktor.client.HttpClient
+import io.ktor.client.request.post
+
+class PostCreatingClientCase(
+    private val baseUrl: String,
+    private val client: HttpClient
+) : PostCreatingCase {
+    private val realBaseUrl = "$baseUrl/$postCreatingRootRoute"
+    override suspend fun createPost(postContent: List<Content>, triggerId: TriggerId): RegisteredPost? = client.unipost(
+        buildStandardUrl(realBaseUrl, postCreatingCreatePostRoute),
+        BodyPair(PostCreatingCreatePostModel.serializer(), PostCreatingCreatePostModel(postContent, triggerId)),
+        RegisteredPost.serializer()
+    )
+}