Andrii Plotnikov version

build.gradle

@@ -1,29 +1,34 @@
+plugins {
+    id 'idea'
+    id 'java'
+    id 'groovy'
+}
+
+task wrapper(type: Wrapper) {
+    gradleVersion = '3.4.1'
+}
+
 group 'com.softwaremill'
 version '1.0-SNAPSHOT'
 
-apply plugin: 'idea'
-apply plugin: 'java'
-apply plugin: 'groovy'
-
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = JavaVersion.VERSION_1_8
+targetCompatibility = JavaVersion.VERSION_1_8
 
 repositories {
     mavenCentral()
 }
 
 dependencies {
-    compile 'io.javaslang:javaslang:2.0.2'
+    compile 'io.javaslang:javaslang:2.0.6'
     compile 'org.jsoup:jsoup:1.10.2'
 
-    compile 'org.slf4j:slf4j-api:1.6.4'
-    compile 'ch.qos.logback:logback-classic:1.0.1'
-    compile 'ch.qos.logback:logback-core:1.0.1'
+    compile 'org.slf4j:slf4j-api:1.7.25'
+    compile 'ch.qos.logback:logback-classic:1.2.2'
+    compile 'ch.qos.logback:logback-core:1.2.2'
 
-    compileOnly "org.projectlombok:lombok:1.16.10"
+    compileOnly 'org.projectlombok:lombok:1.16.16'
 
-    testCompile 'org.spockframework:spock-core:1.0-groovy-2.4'
-    testCompile 'org.codehaus.groovy:groovy:2.4.7'
-    testCompile 'cglib:cglib:3.2.2'
-
+    testCompile 'org.spockframework:spock-core:1.1-groovy-2.4-rc-4'
+    testCompile 'org.codehaus.groovy:groovy:2.4.10'
+    testCompile 'cglib:cglib:3.2.5'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Mar 03 23:12:26 CET 2017
+#Fri Apr 07 20:59:07 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-all.zip

gradlew

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 ##############################################################################
 ##
@@ -154,16 +154,19 @@ if $cygwin ; then
     esac
 fi
 
-# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
-function splitJvmOpts() {
-    JVM_OPTS=("$@")
+# Escape application args
+save ( ) {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
 }
-eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
-JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+APP_ARGS=$(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" == "$PWD" ]]; then
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
   cd "$(dirname "$0")"
 fi
 
-exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
+exec "$JAVACMD" "$@"

src/main/java/com/softwaremill/java_fp_example/contest/aplotnikov/FacebookImageAddressExtractor.java

@@ -0,0 +1,55 @@
+package com.softwaremill.java_fp_example.contest.aplotnikov;
+
+import javaslang.control.Try;
+import lombok.extern.slf4j.Slf4j;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+import static com.softwaremill.java_fp_example.DefaultImage.DEFAULT_IMAGE;
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static org.jsoup.Jsoup.connect;
+
+@Slf4j
+public class FacebookImageAddressExtractor {
+    private static final String FACEBOOK_IMAGE_TAG = "og:image";
+
+    private static final int TEN_SECONDS = (int) SECONDS.toMillis(10);
+
+    private static final Function<Element, String> toContentAttribute = FacebookImageAddressExtractor::getContentAttributeFrom;
+
+    private static final Function<Document, Stream<Element>> toFacebookImageTags = FacebookImageAddressExtractor::findFacebookImageTags;
+
+    public String extractFrom(String url) {
+        return extractFacebookImageTagsFrom(url)
+                .findFirst()
+                .map(toContentAttribute)
+                .orElseGet(() -> {
+                    log.warn("No {} found for blog post {}", FACEBOOK_IMAGE_TAG, url);
+                    return DEFAULT_IMAGE;
+                });
+    }
+
+    private static Stream<Element> extractFacebookImageTagsFrom(String url) {
+        return parseContentFrom(url).map(toFacebookImageTags).getOrElse(Stream::empty);
+    }
+
+    private static Stream<Element> findFacebookImageTags(Document document) {
+        return document.head().select("meta[property=" + FACEBOOK_IMAGE_TAG + ']').stream();
+    }
+
+    private static String getContentAttributeFrom(Element element) {
+        return element.attr("content");
+    }
+
+    private static Try<Document> parseContentFrom(String url) {
+        return Try.of(() -> connect(url).timeout(TEN_SECONDS).get()).onFailure(logErrorFor(url));
+    }
+
+    private static Consumer<Throwable> logErrorFor(String url) {
+        return exception -> log.error("Unable to extract og:image from url {}. Problem: {}", url, exception.getMessage());
+    }
+}

src/main/java/com/softwaremill/java_fp_example/contest/aplotnikov/LICENSE-template.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 aplotnikov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/test/groovy/com/softwaremill/java_fp_example/contest/aplotnikov/FacebookImageAddressExtractorSpec.groovy

@@ -0,0 +1,24 @@
+package com.softwaremill.java_fp_example.contest.aplotnikov
+
+import static com.softwaremill.java_fp_example.DefaultImage.DEFAULT_IMAGE
+
+import spock.lang.Specification
+import spock.lang.Subject
+import spock.lang.Unroll
+
+@Unroll
+class FacebookImageAddressExtractorSpec extends Specification {
+    @Subject
+    FacebookImageAddressExtractor extractor = new FacebookImageAddressExtractor()
+
+    void 'should find image url - #expectedImageUrl into #postAddress'() {
+        expect:
+            extractor.extractFrom(postAddress) == expectedImageUrl
+        where:
+            postAddress                                                || expectedImageUrl
+            'https://softwaremill.com/the-wrong-abstraction-recap/'    || 'https://softwaremill.com/images/uploads/2017/02/street-shoe-chewing-gum.0526d557.jpg'
+            'https://softwaremill.com/using-kafka-as-a-message-queue/' || 'https://softwaremill.com/images/uploads/2017/02/kmq.93f842cf.png'
+            'https://twitter.com/softwaremill'                         || DEFAULT_IMAGE
+            'http://i-do-not-exist.pl'                                 || DEFAULT_IMAGE
+    }
+}