hosting of webui within Spring jar

.gitignore

@@ -25,3 +25,4 @@ dist/
 nbdist/
 .nb-gradle/
 
+/komga/src/main/resources/public/

.travis.yml

@@ -18,7 +18,10 @@ jobs:
   include:
     - stage: deploy
       jdk: openjdk8
-      script: skip   # do not rerun any tests
+      install:
+        - ./gradlew copyWebDist
+        - ./gradlew assemble
+      script: skip
       deploy:
         - provider: script
           script: ./gradlew dockerPushBeta

komga/build.gradle.kts

@@ -1,5 +1,6 @@
 import com.github.breadmoirai.githubreleaseplugin.GithubReleaseTask
 import com.palantir.gradle.docker.DockerExtension
+import org.apache.tools.ant.taskdefs.condition.Os
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
@@ -113,6 +114,42 @@ tasks {
     from(zipTree(getByName("bootJar").outputs.files.singleFile))
     into("$buildDir/dependency")
   }
+
+  register<Delete>("deletePublic") {
+    delete("$projectDir/src/main/resources/public/")
+  }
+
+  register<Exec>("npmInstall") {
+    workingDir("$rootDir/komga-webui")
+    commandLine(
+        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
+          "npm.cmd"
+        } else {
+          "npm"
+        },
+        "install"
+    )
+  }
+
+  register<Exec>("npmBuild") {
+    dependsOn("npmInstall")
+    workingDir("$rootDir/komga-webui")
+    commandLine(
+        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
+          "npm.cmd"
+        } else {
+          "npm"
+        },
+        "run",
+        "build"
+    )
+  }
+
+  register<Copy>("copyWebDist") {
+    dependsOn("deletePublic", "npmBuild")
+    from("$rootDir/komga-webui/dist/")
+    into("$projectDir/src/main/resources/public/")
+  }
 }
 
 configure<DockerExtension> {

komga/src/main/kotlin/org/gotson/komga/infrastructure/web/SPAErrorViewResolver.kt

@@ -0,0 +1,18 @@
+package org.gotson.komga.infrastructure.web
+
+import org.springframework.boot.autoconfigure.web.servlet.error.ErrorViewResolver
+import org.springframework.http.HttpStatus
+import org.springframework.stereotype.Component
+import org.springframework.web.servlet.ModelAndView
+import javax.servlet.http.HttpServletRequest
+
+
+@Component
+class SPAErrorViewResolver : ErrorViewResolver {
+  override fun resolveErrorView(request: HttpServletRequest, status: HttpStatus, model: MutableMap<String, Any>): ModelAndView =
+      if (status == HttpStatus.NOT_FOUND) {
+        ModelAndView("/", HttpStatus.TEMPORARY_REDIRECT)
+      } else {
+        ModelAndView("/error", status)
+      }
+}