Issue 64: Use mailgun to send email when user volunteers for a project

issue: #64
pr: #105

build.gradle

@@ -38,6 +38,7 @@ dependencies {
 	compile('org.springframework.boot:spring-boot-starter-thymeleaf')
 	compile('com.auth0:java-jwt:3.4.0')
 	compile group: 'com.google.guava', name: 'guava', version: '23.5-jre'
+	compile group: 'com.mashape.unirest', name: 'unirest-java', version: '1.3.1'
 	runtime 'org.springframework.boot:spring-boot-starter-tomcat:1.5.6.RELEASE'
     runtime 'org.springframework.security:spring-security-taglibs:4.2.3.RELEASE'
     runtime 'org.apache.tomcat.embed:tomcat-embed-jasper:8.5.20'

src/main/java/org/seattlevoluntech/SeattlevoluntechAppConfig.java

@@ -0,0 +1,29 @@
+package org.seattlevoluntech;
+
+import org.seattlevoluntech.Utilities.EmailUtility;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class SeattlevoluntechAppConfig {
+
+    // Bean configuration for Mail Sender
+
+    /**
+     * Domain for mailgun mail sender api
+     */
+    @Value(value = "${mailgun.domain}")
+    private String mailgunDomain;
+
+    /**
+     * API key required to send emails through mailgun
+     */
+    @Value(value = "${mailgun.api.key}")
+    private String mailgunApiKey;
+
+    @Bean
+    public EmailUtility emailUtility() {
+        return new EmailUtility(mailgunDomain, mailgunApiKey);
+    }
+}

src/main/java/org/seattlevoluntech/Utilities/EmailUtility.java

@@ -0,0 +1,25 @@
+package org.seattlevoluntech.Utilities;
+
+import com.mashape.unirest.http.HttpResponse;
+import com.mashape.unirest.http.JsonNode;
+import com.mashape.unirest.http.Unirest;
+import com.mashape.unirest.http.exceptions.UnirestException;
+import lombok.RequiredArgsConstructor;
+import org.seattlevoluntech.models.Email;
+
+@RequiredArgsConstructor
+public class EmailUtility {
+    private final String DOMAIN;
+    private final String API_KEY;
+
+    public JsonNode SendSimpleMessage(Email email) throws UnirestException {
+        HttpResponse<JsonNode> request = Unirest.post("https://api.mailgun.net/v3/" + DOMAIN + "/messages")
+                .basicAuth("api", API_KEY)
+                .field("from", email.getFrom())
+                .field("to", email.getTo())
+                .field("subject", email.getSubject())
+                .field("text", email.getMessage())
+                .asJson();
+        return request.getBody();
+    }
+}

src/main/java/org/seattlevoluntech/controllers/ProjectController.java

@@ -1,6 +1,9 @@
 package org.seattlevoluntech.controllers;
 
 import com.google.common.collect.Lists;
+import com.mashape.unirest.http.exceptions.UnirestException;
+import org.seattlevoluntech.Utilities.EmailUtility;
+import org.seattlevoluntech.models.Email;
 import org.seattlevoluntech.storage.Project;
 import org.seattlevoluntech.storage.*;
 import org.slf4j.Logger;
@@ -21,6 +24,8 @@ public class ProjectController {
     private ProjectsRepository projectsRepository;
     @Autowired
     private UsersRepository usersRepository;
+    @Autowired
+    private EmailUtility emailUtility;
 
     // Create project
     @PostMapping(path="/projects")
@@ -112,8 +117,12 @@ public Optional<Project> linkUserWithProject(
         }
 
 
-        optionalUser.get().addProject(optionalProject.get());
+        Optional newProjectList = Optional.ofNullable(optionalUser.get().addProject(optionalProject.get()));
+
         usersRepository.save(optionalUser.get());
+        if (newProjectList.isPresent()) {
+            sendEmail(optionalUser.get(), optionalProject.get());
+        }
 
         return projectsRepository.findById(projectId);
     }
@@ -128,4 +137,25 @@ public List<Project> deleteProject(@PathVariable("id") Long id) {
         projectsRepository.deleteById(id);
         return Lists.newArrayList(projectsRepository.findAll());
     }
+
+
+    private void sendEmail(User user, Project project) {
+        try {
+            Email email = new Email();
+            email.setFrom("no-reply@seattlevoluntech.com");
+            // TODO: Set this email up dynamically based on the owner of the project
+            email.setTo("jennyyuan88+voluntechTest@gmail.com");
+            email.setSubject("You got a volunteer for: " + project.getProjectName());
+            email.setMessage(
+                    "Hello, a volunteer joined your project named "
+                            + project.getProjectName()
+                            + ".  Their name is "
+                            + user.getFirstName() + " " + user.getLastName() + "."
+                            + " You can reach them at: " + user.getEmail()
+            );
+            emailUtility.SendSimpleMessage(email);
+        } catch (UnirestException e) {
+            logger.error(e.toString());
+        }
+    }
 }

src/main/java/org/seattlevoluntech/models/Email.java

@@ -0,0 +1,11 @@
+package org.seattlevoluntech.models;
+
+import lombok.Data;
+
+@Data
+public class Email {
+    private String from;
+    private String to;
+    private String subject;
+    private String message;
+}

src/main/java/org/seattlevoluntech/storage/User.java

@@ -117,11 +117,13 @@ public void setLastName(String lastName) {
 
   public void setEmail(String email) { this.email = email; }
 
-  public void addProject(Project project) {
+  public List<Project> addProject(Project project) {
     if (!this.projects.contains(project))
     {
       projects.add(project);
+      return projects;
     }
+    return null;
   }
 
   @JsonIgnoreProperties("users")

src/main/resources/application.properties

@@ -10,3 +10,7 @@ spring.datasource.password=${DB_PASS}
 
 #Do nothing
 spring.jpa.hibernate.ddl-auto=none
+
+#Mailgun email sender properties:
+mailgun.domain: sandbox08786ed216874ad697286dcf97357a43.mailgun.org
+mailgun.api.key: 41a98182603ad234d941c01860d8e426-c8c889c9-270b8e5a